CN112474033B - Coal slime pre-desliming and sorting process - Google Patents
Coal slime pre-desliming and sorting process Download PDFInfo
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- CN112474033B CN112474033B CN202011221905.3A CN202011221905A CN112474033B CN 112474033 B CN112474033 B CN 112474033B CN 202011221905 A CN202011221905 A CN 202011221905A CN 112474033 B CN112474033 B CN 112474033B
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- 239000003245 coal Substances 0.000 title claims abstract description 112
- 238000000034 method Methods 0.000 title claims abstract description 31
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 64
- 238000003756 stirring Methods 0.000 claims abstract description 53
- 239000002245 particle Substances 0.000 claims abstract description 51
- 239000002002 slurry Substances 0.000 claims abstract description 36
- 238000005188 flotation Methods 0.000 claims abstract description 35
- 238000000926 separation method Methods 0.000 claims abstract description 29
- 230000003139 buffering effect Effects 0.000 claims abstract description 25
- 239000007787 solid Substances 0.000 claims abstract description 20
- 230000000087 stabilizing effect Effects 0.000 claims abstract description 19
- 238000002360 preparation method Methods 0.000 claims abstract description 8
- 238000005086 pumping Methods 0.000 claims abstract description 7
- 239000011362 coarse particle Substances 0.000 claims abstract description 6
- 239000003250 coal slurry Substances 0.000 claims description 28
- 239000000463 material Substances 0.000 claims description 16
- 238000002156 mixing Methods 0.000 claims description 10
- 238000010790 dilution Methods 0.000 claims description 6
- 239000012895 dilution Substances 0.000 claims description 6
- 239000003795 chemical substances by application Substances 0.000 claims description 5
- 239000004088 foaming agent Substances 0.000 claims description 5
- 238000005192 partition Methods 0.000 claims description 5
- 238000012544 monitoring process Methods 0.000 claims description 3
- 238000011010 flushing procedure Methods 0.000 claims 1
- 239000013049 sediment Substances 0.000 claims 1
- 239000000203 mixture Substances 0.000 abstract description 4
- 238000012216 screening Methods 0.000 description 8
- 230000001502 supplementing effect Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000003153 chemical reaction reagent Substances 0.000 description 3
- 230000005484 gravity Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- B03B9/00—General arrangement of separating plant, e.g. flow sheets
- B03B9/005—General arrangement of separating plant, e.g. flow sheets specially adapted for coal
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- B03B7/00—Combinations of wet processes or apparatus with other processes or apparatus, e.g. for dressing ores or garbage
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D1/00—Flotation
- B03D1/14—Flotation machines
- B03D1/1406—Flotation machines with special arrangement of a plurality of flotation cells, e.g. positioning a flotation cell inside another
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04C—APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES
- B04C9/00—Combinations with other devices, e.g. fans, expansion chambers, diffusors, water locks
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D2201/00—Specified effects produced by the flotation agents
- B03D2201/02—Collectors
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D2201/00—Specified effects produced by the flotation agents
- B03D2201/04—Frothers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D2203/00—Specified materials treated by the flotation agents; Specified applications
- B03D2203/02—Ores
- B03D2203/04—Non-sulfide ores
- B03D2203/08—Coal ores, fly ash or soot
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- Biotechnology (AREA)
- Separation Of Solids By Using Liquids Or Pneumatic Power (AREA)
Abstract
The invention discloses a pre-desliming and sorting process of coal slime, coal slime water in a coal preparation plant is uniformly stirred, the underflow is used as coarse clean coal after being classified by a concentration cyclone, and the overflow flows through a coarse-separating sieve bend to remove coarse particles, entering a buffering and stirring barrel, entering overflow slime water into a mirror image double-cone generator through a feeding slurry pump and a feeding pressure stabilizing tube, pre-classifying into a plurality of narrow-particle-size particle groups through the mirror image double-cone generator, respectively enters a plurality of hydrocyclones, coal particles with relatively coarse granularity and medium-high density coal gangue intergrowth particles are discharged from a bottom flow port of the plurality of hydrocyclones and enter a buffer pool of the parallel hydrocyclones, high-ash heterogeneous fine mud particles are discharged through an overflow pipe at the upper end of the plurality of hydrocyclones, and pumping the coal slime into a liquid-solid fluidized bed coal slime flotation system or a separation system in the next stage through a slurry pump according to the granularity composition and the selectivity of the coal slime in the buffer pool of the parallel hydrocyclones. Compared with the prior art, the invention can realize the pre-desliming and classification before the coal slime enters the separation system.
Description
Technical Field
The invention belongs to the technical field of fine coal separation in coal separation plants in coal mine production, and particularly relates to a coal slime pre-desliming separation process.
Background
A large amount of high-ash heterogeneous fine mud particles in the coal slime have serious interference on the separation of the coal slime. In the coal slime flotation process, a large amount of high-ash heterogeneous fine mud particles enter flotation clean coal in a mechanical entrainment mode, and the ash content of the flotation clean coal is increased; the coal can be adsorbed on the surface of coal particles in a cover mode, so that the recovery rate of the flotation combustible body is reduced; in addition, the fine mud particles also increase the flotation drug consumption. In the process of coal slime gravity separation, the fine mud particles are low in sedimentation final speed, so that the separation precision of the coal slime gravity separation equipment can be seriously reduced.
Patent CN104399595A proposes a flotation process for high-ash difficult-to-float coal slime, which comprises the steps of firstly adopting a reverse flotation process to select partial high-ash fine slime in the coal slime, and then adopting a forward flotation process to sort the coal slime. However, the reverse flotation desliming process has the disadvantages of small treatment capacity and high cost, and various beneficiation reagents are required in the reverse flotation process, so that the reverse flotation process is not beneficial to environmental protection.
Patent CN103831163A provides a flotation coal slime pre-tailing throwing process, which uses two-stage small cone angle cyclone groups connected in series as main grading tailing throwing equipment, carries out grading and tailing throwing treatment on overflow of a concentrated cyclone of a coal preparation plant after coarse separation, and underflow of the small cone angle cyclone after tailing throwing treatment enters a flotation system for separation, and the essence of tailing throwing is to remove high-ash heterogeneous fine mud particles in coal slime water by using the small cone angle cyclone. Although the invention has a good gain effect, the process is more complex, the number of auxiliary equipment is more, and the structural arrangement is not compact enough. The effect gain on oxidized coal slime and low-order difficult-to-float coal slime may be poor.
Disclosure of Invention
Based on the defects of the prior art, the invention aims to provide a coal slime pre-desliming and sorting process, which improves the sorting efficiency of the coal slime and reduces the sorting cost by pre-desliming before sorting.
In order to solve the technical problem, the invention provides a coal slime pre-desliming separation process, the equipment used by the coal slime pre-desliming separation process comprises a buffering stirring barrel, a slurry pump, a feeding pressure stabilizing tube, a mirror image double-cone generator, a tangential flow parallel hydrocyclone, a terminal parallel hydrocyclone, a parallel hydrocyclone buffer tank, an ore pulp stirring barrel, an underflow flotation machine and an underflow liquid-solid fluidized bed separator, and the coal slime pre-desliming separation process comprises the following steps: coal slurry water of a coal preparation plant is uniformly stirred and graded through a concentration cyclone, then underflow is used as coarse clean coal, overflow coal slurry water is coarsely separated through a coarse separation arc screen arranged in a buffering stirring barrel through an overflow pipe of the concentration cyclone and then enters the buffering stirring barrel, the upper limit of the particle size of solid particles in the coal slurry water in the buffering stirring barrel is smaller than the upper limit of the particle size of standard feeding materials used by a small cone angle hydrocyclone, the coarsely separated overflow coal slurry water is uniformly stirred in the buffering stirring barrel, and the concentration of the coal slurry water is detected by an ore pulp concentration meter, so that the mass concentration of the coal slurry water is stabilized within the range of 10-25%; when the slurry water in the buffering and stirring barrel conforms to the feeding concentration of the mirror image double-cone generator, pumping the slurry water uniformly stirred in the buffering and stirring barrel into the left end of a feeding pressure stabilizing tube connected with a feeding port of the mirror image double-cone generator through a feeding slurry pump, sealing the right end of the feeding pressure stabilizing tube, and detecting a pressure gauge on the feeding pressure stabilizing tube, wherein the reading of the pressure gauge is stabilized within 0.1-0.35 Mpa; the slime water is fed into the mirror image double-cone generator through a feeding port of the mirror image double-cone generator along the tangential direction, and flows through the first-stage cone generator and the second-stage cone generator in the mirror image double-cone generator along the cylinder wall from the middle large-diameter part in sequence along the axial direction to do spiral motion to the small-diameter ends at the two ends of the mirror image double-cone generator; the materials are classified and sorted for the first time in the mirror image double-cone generator, and coarser solid particles, namely large and medium-sized particle groups moving along the wall of the mirror image double-cone generator firstly enter a first heavy tangential flow parallel hydrocyclone close to a feeding port of the mirror image double-cone generator through a first-stage tangential flow guide pipe to be classified and sorted; then, the finer particles-the secondary large middle-diameter particle group continuously make spiral motion to two ends along the mirror image double-cone generator, enter a second heavy tangential flow parallel hydrocyclone through a second-stage tangential flow guide pipe for classification, and finally enter the materials in spiral motion into terminal parallel hydrocyclones at two ends of the mirror image double-cone generator; the materials are classified and sorted, and high-ash heterogeneous fine mud particles are discharged to be concentrated and filter-pressed to be directly used as middlings or tailings through a first heavy tangential flow parallel hydrocyclone overflow port, a second heavy tangential flow parallel hydrocyclone overflow port and a terminal parallel hydrocyclone overflow port; coal particles with relatively coarse particle sizes and medium-high density gangue intergrowth particles are respectively discharged into a first buffer chamber, a second buffer chamber and a third buffer chamber which are formed by a detachable first partition plate and a detachable second partition plate in a parallel hydrocyclone buffer tank through a first heavy tangential flow parallel hydrocyclone underflow port, a second heavy tangential flow parallel hydrocyclone underflow port and a terminal parallel hydrocyclone underflow port, wherein the first heavy tangential flow parallel hydrocyclone underflow port, the second heavy tangential flow parallel hydrocyclone underflow port and the terminal parallel hydrocyclone underflow port are arranged above the parallel hydrocyclone buffer tank, the first buffer chamber, the second buffer chamber and the third buffer chamber and are lower than the upper edges of the parallel hydrocyclone buffer tank, the first buffer chamber, the second buffer chamber and the third buffer chamber; monitoring the concentration of the coal slurry water in the first buffer chamber, the second buffer chamber and the third buffer chamber in real time by using an ore slurry concentration meter; and mixing the slime water in the first buffer chamber, the second buffer chamber and the third buffer chamber by using a buffer pool slurry pump or pumping the slime water into a pulp stirring barrel independently, and automatically flowing the slime water after stirring and mixing uniformly into a flotation machine or a liquid-solid fluidized bed separator for separation.
Further, supplementing water to dilute in a stirring barrel in front of the flotation machine to ensure that the concentration of the slime water is controlled to be 75-110 g/L, and sequentially and quantitatively adding a collecting agent and a foaming agent, wherein in the separation procedure, supplementing water to dilute in the stirring barrel in front of the liquid-solid fluidized bed separator to ensure that the concentration of the slime water is controlled to be 300-450 g/L.
Furthermore, the overflow port of the first heavy tangential flow parallel hydrocyclone, the overflow port of the second heavy tangential flow parallel hydrocyclone and the overflow port of the terminal parallel hydrocyclone are all arranged in an umbrella shape, and if the materials are arranged in a column shape, the pressure in the feeding pressure stabilizing pipe is required to be adjusted by adjusting the flow of the feeding slag slurry pump.
Compared with the prior art, the coal slime pre-desliming and sorting process can realize pre-desliming before the coal slime enters the sorting system, remove high-ash heterogeneous fine mud particles and prevent easily-argillized non-coal mine objects from entering the sorting system; the pressure of a coal slime separation system of a coal preparation plant is reduced, the separation environment of separation equipment is simplified, the working efficiency of a flotation machine or a liquid-solid fluidized bed separator is improved, the consumption of a coal slime forward flotation reagent is reduced, the use of a coal slime reverse flotation reagent is avoided, the production cost is reduced, the energy is saved, the environment is protected, and the recycling of coal washing water is facilitated. In addition, the non-metallic minerals in the high-ash heterogeneous fine mud can be recovered as early as possible.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood, the present invention may be implemented in accordance with the content of the description, and in order to make the above and other objects, features, and advantages of the present invention more clearly understood, the following detailed description is given in conjunction with the preferred embodiments, together with the accompanying drawings.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments will be briefly described below.
FIG. 1 is a schematic structural diagram of a device for a pre-desliming and sorting process of coal slime in embodiment 1 of the invention;
fig. 2 is a schematic structural diagram of equipment for a coal slime pre-desliming and sorting process according to embodiment 2 of the invention.
In the figure, 1-a concentration swirler overflow pipe, 2-a coarse screening arc sieve, 3-a buffering stirring barrel, 4-a feeding slurry pump, 5-a feeding pressure stabilizing pipe, 6-a pressure gauge, 7-a mirror image double-cone generator feeding port, 8-a mirror image double-cone generator, 9 a-a first-stage cone generator, 9 b-a second-stage cone generator, 10 a-a first heavy tangential flow guide pipe, 10 b-a second heavy tangential flow guide pipe, 11 a-a first heavy tangential flow parallel hydrocyclone, 11 b-a second heavy tangential flow parallel hydrocyclone, 12 a-a first heavy tangential flow parallel hydrocyclone overflow port, 12 b-a second heavy tangential flow parallel hydrocyclone overflow port, 13 a-a first heavy tangential flow parallel hydrocyclone bottom flow port, 13 b-a second heavy tangential flow parallel hydrocyclone bottom flow port, 14-terminal parallel hydrocyclone, 15-terminal parallel hydrocyclone overflow port, 16-terminal parallel hydrocyclone underflow port, 17-parallel hydrocyclone buffer pool, 17-1-first buffer chamber, 17-2-second buffer chamber, 17-3-third buffer chamber, 18-buffer pool slurry pump, 18-1-first buffer chamber slurry pump, 18-2-second buffer chamber slurry pump, 18-3-third buffer chamber slurry pump, 19-slurry stirring barrel, 19-1-first buffer chamber slurry stirring barrel, 19-2-second buffer chamber slurry stirring barrel, 19-3-third buffer chamber slurry stirring barrel, 20-flotation machine, 21-liquid-solid fluidized bed separator, 22 a-first partition plate, 22 b-second separator.
Detailed Description
Other aspects, features and advantages of the present invention will become apparent from the following detailed description, taken in conjunction with the accompanying drawings, which form a part of this specification, and which illustrate, by way of example, the principles of the invention. In the referenced drawings, the same or similar components in different drawings are denoted by the same reference numerals.
Example 1
The coal slime pre-desliming and sorting process of the embodiment adopts a mirror image double-cone generator and a small cone angle hydrocyclone treatment process connected in parallel to the mirror image double-cone generator to realize the pre-desliming of the coal slime before the flotation of the coal slime enters a sorting procedure, and the process comprises the following steps: fully stirring the coal slime water in a coal slime pool of a coal preparation plant, classifying the coal slime water after uniformly stirring by a concentration swirler, taking underflow as coarse clean coal, allowing overflow coal slime water to pass through an overflow pipe 1 of the concentration swirler, coarse-separating an arc sieve 2 arranged in a buffering stirring barrel 3, allowing the overflow coal slime water to enter the buffering stirring barrel 3 after coarse separation, wherein the size of a sieve hole of the coarse-separating arc sieve 2 is 0.5mm, the upper limit of the particle size of solid particles in the coal slime water in the buffering stirring barrel 3 is smaller than the upper limit of the standard feeding particle size of a small cone angle hydrocyclone, uniformly stirring the coarse-separated overflow coal slime water in the buffering stirring barrel 3, detecting the concentration of the coal slime water by an ore pulp concentration meter, and stabilizing the mass concentration of the coal slime water within the range of 10-25%, wherein the specific concentration needs to be determined according to the composition properties of the particle size and the density and subsequent separation process. After the slurry water in the buffering and stirring barrel 3 conforms to the feeding concentration of the mirror image double-cone generator 8, the slurry water stirred and uniformly mixed in the buffering and stirring barrel 3 is pumped into the left end of a feeding pressure stabilizing tube 5 connected with a feeding port 7 of the mirror image double-cone generator through a feeding slurry pump 4, the right end of the feeding pressure stabilizing tube 5 is sealed, a pressure gauge 6 on the feeding pressure stabilizing tube 5 is detected, the number of the pressure gauge 6 is stabilized within 0.1-0.35 Mpa, and the specific pressure value needs to be adjusted according to the slurry property and the desliming effect. Slime water is fed into the mirror image double-cone generator 8 through the mirror image double-cone generator feeding port 7 in the tangential direction, and flows through the first-stage cone generator 9a and the second-stage cone generator 9b in the mirror image double-cone generator 8 along the cylinder wall from the middle large-diameter part in sequence along the axial direction to do spiral motion to the small-diameter ends at the two ends of the mirror image double-cone generator 8. The barrel diameter of the mirrored double cone generator 8 is 100mm or 150 mm. The materials are classified and sorted for the first time in the mirror image double-cone generator 8, and coarser solid particles-large and medium-sized particle groups moving along the wall of the mirror image double-cone generator firstly enter a first heavy tangential flow parallel hydrocyclone 11a close to a feeding port 7 of the mirror image double-cone generator through a first-stage tangential flow guide pipe 10a to be classified and sorted; then the finer particles-the secondary large middle-diameter particle group continue to do spiral motion to the two ends along the mirror image double-cone generator, enter a second heavy tangential flow parallel hydrocyclone 11b through a second-stage tangential flow conduit 10b for classification, and finally the spirally moved materials enter terminal parallel hydrocyclones 14 at the two ends of the mirror image double-cone generator. The hydrocyclones 11a, 11b and 14 all have a cone angle below 20 deg. and a diameter of 150mm or 200mm or 250 mm. The materials are classified and sorted, high-ash heterogeneous fine mud particles are discharged to be concentrated and filter-pressed directly as middlings or tailings through a first heavy tangential flow parallel hydrocyclone overflow port 12a, a second heavy tangential flow parallel hydrocyclone overflow port 12b and a terminal parallel hydrocyclone overflow port 15, and overflow products can be respectively mixed or not mixed according to production requirements and coal slime properties. Coal particles with relatively coarse particle sizes and medium-high density gangue intergrowth particles are respectively discharged into a first buffer chamber 17-1, a second buffer chamber 17-2 and a third buffer chamber 17-3 which are formed by separating a first clapboard 22a and a second clapboard 22b in a parallel hydrocyclone buffer tank 17 through a first heavy tangential flow parallel hydrocyclone underflow port 13a, a second heavy tangential flow parallel hydrocyclone underflow port 13b and a terminal parallel hydrocyclone underflow port 16, wherein the first heavy tangential flow parallel hydrocyclone underflow port 13a, the second heavy tangential flow parallel hydrocyclone underflow port 13b and the terminal parallel hydrocyclone underflow port 16 are arranged above the parallel hydrocyclone buffer tank 17, the first buffer chamber 17-1, the second buffer chamber 17-2 and the third buffer chamber 17-3 and are lower than the parallel hydrocyclone buffer tank 17, The first buffer chamber 17-1, the second buffer chamber 17-2 and the third buffer chamber 17-3 are arranged at the upper edge. The overflow port 12a of the first heavy tangential flow parallel hydrocyclone, the overflow port 12b of the second heavy tangential flow parallel hydrocyclone and the overflow port 15 of the terminal parallel hydrocyclone are arranged in an umbrella shape, and if the arrangement is columnar, the pressure in the feeding pressure-stabilizing tube 5 is adjusted by adjusting the flow of the feeding slurry pump 4. The concentration of the muddy water in the first buffer chamber 17-1, the second buffer chamber 17-2 and the third buffer chamber 17-3 is monitored in real time by a pulp concentration meter. The granularity of the coal slime in the buffer chamber is detected in time through a small screening experiment, when the granularity difference of the coal slime in the first buffer chamber 17-1, the second buffer chamber 17-2 and the third buffer chamber 17-3 is large, the granularity of more coal slime in the first buffer chamber 17-1 exceeds 0.25mm, the granularity of the coal slime in the second buffer chamber 17-2 and the third buffer chamber 17-3 is similar, and the granularity of the coal slime is basically below 0.25mm, water is supplemented for dilution to ensure that the concentration of the coal slime in the first buffer chamber 17-1 is 300-450 g/L, the coal slime in the first buffer chamber 17-1 is pumped into a first buffer chamber pulp stirring barrel 19-1 through the first buffer chamber slag 18-1, and the coal slime flows into a liquid-solid separator 21 for gravity separation after being stirred and mixed uniformly; supplementing water for dilution to ensure that the concentration of the coal slurry water in the second buffer chamber 17-2 is 75-110 g/L, sequentially and quantitatively adding a collecting agent and a foaming agent, pumping the coal slurry water in the second buffer chamber 17-2 into a second buffer chamber pulp stirring barrel 19-2 through a second buffer chamber slurry pump 18-2, stirring and uniformly mixing, and then automatically flowing into a flotation machine 20 for flotation; supplementing water for dilution to ensure that the concentration of the coal slurry water in the third buffer chamber 17-3 is 75-110 g/L, sequentially and quantitatively adding a collecting agent and a foaming agent, pumping the coal slurry water in the third buffer chamber 17-3 into the ore slurry stirring barrel 19-3 of the second buffer chamber through the third buffer chamber slurry pump 18-3, stirring and uniformly mixing, and then automatically flowing into a flotation machine 20 for flotation. And (3) detecting and sorting clean coal and tail coal slime ash in time, and adjusting the feeding parameters and the structural parameters of the mirror image cone generator 8 and the parallel hydrocyclones 11a, 11b and 14 and the working parameters of the liquid-solid fluidized bed 21 and the flotation machine 20 as required.
Example 2
The coal slime pre-desliming and sorting process of the embodiment adopts a mirror image double-cone generator and a small cone angle hydrocyclone treatment process connected in parallel to the mirror image double-cone generator to realize the pre-desliming of the coal slime before the flotation of the coal slime enters a sorting procedure. The process comprises the following steps: fully stirring the coal slurry in a coal slurry pool of a coal preparation plant, classifying the coal slurry by a concentration swirler after uniformly stirring, taking underflow as coarse clean coal, allowing overflow coal slurry to pass through an overflow pipe 1 of the concentration swirler, coarse screening by a coarse screening arc sieve 2 arranged in a buffering stirring barrel 3, entering the buffering stirring barrel 3, wherein the size of a sieve hole of the coarse screening arc sieve is 0.5mm, the upper limit of the particle size of solid particles in the coal slurry in the buffering stirring barrel 3 is less than the upper limit of the particle size of standard feeding of a small cone angle hydrocyclone, uniformly stirring the coarse screening overflow coal slurry in the buffering stirring barrel 3, detecting the concentration of the coal slurry by an ore pulp concentration meter to ensure that the mass concentration is stabilized within the range of 10-25%, wherein the specific concentration is determined according to the composition property of the coal slurry particle size and the density and the subsequent separation process, when the coal slurry in the buffering stirring barrel 3 conforms to the feeding concentration of a mirror image double-cone generator 8, the slime water which is uniformly stirred in the buffering stirring barrel 3 is pumped into the left end of a feeding pressure stabilizing tube 5 connected with a feeding port 7 of the mirror image double-cone generator through a feeding slurry pump 4, the right end of the feeding pressure stabilizing tube 5 is closed, a pressure gauge 6 on the feeding pressure stabilizing tube 5 is detected, the number of the pressure gauge 6 is stabilized in 0.1-0.35 Mpa, and the specific pressure value needs to be adjusted according to the slime property and the desliming effect. Slime water is fed into the mirror image double-cone generator 8 through the mirror image double-cone generator feeding port 7 in the tangential direction, and flows through the first-stage cone generator 9a and the second-stage cone generator 9b in the mirror image double-cone generator 8 along the cylinder wall from the middle large-diameter part in sequence along the axial direction to do spiral motion to the small-diameter ends at the two ends of the mirror image double-cone generator 8. The barrel diameter of the mirrored double cone generator 8 is 100mm or 150 mm. The materials are classified and sorted for the first time in the mirror image double-cone generator 8, and coarser solid particles-large and medium-sized particle groups moving along the wall of the mirror image double-cone generator firstly enter a first heavy tangential flow parallel hydrocyclone 11a close to a feeding port 7 of the mirror image double-cone generator through a first-stage tangential flow guide pipe 10a to be classified and sorted; then the finer particles-the secondary large middle-diameter particle group continue to do spiral motion to the two ends along the mirror image double-cone generator, enter a second heavy tangential flow parallel hydrocyclone 11b through a second-stage tangential flow conduit 10b for classification, and finally the spirally moved materials enter terminal parallel hydrocyclones 14 at the two ends of the mirror image double-cone generator. The hydrocyclones 11a, 11b and 14 all have a cone angle below 20 deg. and a diameter of 150mm or 200mm or 250 mm. The materials are classified and sorted, high-ash heterogeneous fine mud particles are discharged to be concentrated and filter-pressed directly as middlings or tailings through a first heavy tangential flow parallel hydrocyclone overflow port 12a, a second heavy tangential flow parallel hydrocyclone overflow port 12b and a terminal parallel hydrocyclone overflow port 15, and overflow products can be respectively mixed or not mixed according to production requirements and coal slime properties. Coal particles with relatively coarse particle sizes and medium-high density gangue intergrowth particles are respectively discharged into a parallel hydrocyclone buffer pool 17 through a first heavy tangential flow parallel hydrocyclone underflow port 13a, a second heavy tangential flow parallel hydrocyclone underflow port 13b and a terminal parallel hydrocyclone underflow port 16, and the first heavy tangential flow parallel hydrocyclone underflow port 13a, the second heavy tangential flow parallel hydrocyclone underflow port 13b and the terminal parallel hydrocyclone underflow port 16 are arranged above the parallel hydrocyclone buffer pool 17 and are lower than the upper edge of the parallel hydrocyclone buffer pool 17. The overflow port 12a of the first heavy tangential flow parallel hydrocyclone, the overflow port 12b of the second heavy tangential flow parallel hydrocyclone and the overflow port 15 of the terminal parallel hydrocyclone are arranged in an umbrella shape, and if the arrangement is columnar, the pressure in the feeding pressure-stabilizing tube 5 is adjusted by adjusting the flow of the feeding slurry pump 4. And monitoring the concentration of the coal slurry water in the buffer tank 17 in real time by using an ore slurry concentration meter. The method comprises the steps of detecting the granularity of coal slime in a buffer pool 17 through a small screening experiment in time, supplementing water for dilution when the granularity of the coal slime in the buffer pool 17 is basically below 0.25mm to ensure that the concentration of the coal slime water in the buffer pool 17 is 75-110 g/L, sequentially and quantitatively adding a collecting agent and a foaming agent, pumping the coal slime water in the buffer pool 17 into an ore pulp stirring barrel 19 through a slurry pump 18, stirring and uniformly mixing, and then automatically flowing into a flotation machine 20 for flotation. The fine coal and the tailing coal slime ash are detected and sorted in time, and the feeding parameters and the structural parameters of the mirror image cone generator 8 and the parallel hydrocyclones 11a, 11b and 14 and the working parameters of the flotation machine 20 are adjusted according to requirements.
In the coal slime pre-desliming and sorting process of the invention, coal slime water in a coal preparation plant is stirred and uniformly mixed, the coal slime water is classified by a concentration cyclone, then the underflow is used as coarse clean coal, the overflow is removed by a coarse screening sieve 2, entering a buffering and stirring barrel 3, stirring and uniformly mixing, then entering overflow coal slime water into a mirror image double-cone generator 8 through a feeding slurry pump 4 and a feeding pressure stabilizing pipe 5, pre-grading into a plurality of narrow particle size fraction groups through the mirror image double-cone generator 8, then respectively entering multiple hydrocyclones connected in parallel, discharging coal particles with relatively coarse particle sizes and medium-high density gangue intergrowth particles from bottom flow ports of the multiple hydrocyclones connected in parallel into a buffer pool 17 of the multiple hydrocyclones connected in parallel, discharging high-ash heterogeneous fine mud particles through overflow pipes at the upper ends of the multiple hydrocyclones connected in parallel, according to the granularity composition and the selectivity of the coal slime in the buffer pool 17 of the parallel hydrocyclone, the coal slime is pumped into a liquid-solid fluidized bed coal slime flotation system or a separation system of the next stage through a slurry pump 18. Compared with the prior art, the coal slime pre-desliming and sorting process can realize pre-desliming and sorting before the coal slime enters the sorting system.
While the foregoing is directed to the preferred embodiment of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow.
Claims (3)
1. The coal slime is desliming sorting process in advance, including buffering agitator (3), sediment stuff pump (4, 18), feed stabilivolt (5), mirror image bipyramid generator (8), the parallelly connected hydrocyclone of tangential flow (11a, 11b), the parallelly connected hydrocyclone of terminal (14), parallelly connected hydrocyclone buffer pool (17), ore pulp agitator (19), flotation machine (20), liquid-solid fluidized bed sorter (21), its characterized in that, the coal slime is desliming sorting process as follows in advance:
coal slurry water of a coal preparation plant is uniformly stirred and graded through a concentration swirler, then underflow is used as coarse clean coal, overflow coal slurry water enters a buffer stirring barrel (3) after being coarsely separated through a coarse separating arc screen (2) arranged in the buffer stirring barrel (3) through a concentration swirler overflow pipe (1), the upper limit of the particle size of solid particles in the coal slurry water in the buffer stirring barrel (3) is required to be smaller than the upper limit of the particle size of a standard feeding material used by a small cone angle hydrocyclone, the coarsely separated overflow coal slurry water is uniformly stirred and mixed in the buffer stirring barrel (3), and the concentration of the coal slurry water is detected by an ore slurry concentration meter, so that the mass concentration of the coal slurry water is stabilized within the range of 10-25%;
when the slime water in the buffering and stirring barrel (3) accords with the feeding concentration of the mirror image double-cone generator (8), the slime water stirred and uniformly mixed in the buffering and stirring barrel (3) is pumped into the left end of a feeding pressure stabilizing tube (5) connected with a feeding port (7) of the mirror image double-cone generator through a feeding slurry pump (4), the right end of the feeding pressure stabilizing tube (5) is closed, a pressure gauge (6) on the feeding pressure stabilizing tube (5) is detected, and the indication number of the pressure gauge (6) is stabilized within 0.1-0.35 Mpa;
coal slime water is fed into a mirror image double-cone generator (8) through a mirror image double-cone generator feeding port (7) along the tangential direction, and flows through a first-stage cone generator (9a) and a second-stage cone generator (9b) in the mirror image double-cone generator (8) along the cylinder wall from the middle large-diameter part in sequence along the axial direction to do spiral motion towards the small-diameter ends at the two ends of the mirror image double-cone generator (8);
the materials are classified and sorted for the first time in a mirror image double-cone generator (8), and coarser solid particles, namely large and medium-sized particle groups moving along the wall of the mirror image double-cone generator firstly enter a first heavy tangential flow parallel hydrocyclone (11a) close to a feeding port (7) of the mirror image double-cone generator through a first-stage tangential flow guide pipe (10a) to be classified and sorted; then, the finer particles-the secondary large-middle-diameter particle group continuously make spiral motion to two ends along the mirror image double-cone generator, enter a second heavy tangential flow parallel hydrocyclone (11b) through a second-stage tangential flow guide pipe (10b) for classification, and finally enter the materials in spiral motion into terminal parallel hydrocyclones (14) at two ends of the mirror image double-cone generator;
the materials are classified and sorted, and high-ash heterogeneous fine mud particles are discharged to be concentrated and filter-pressed to be directly used as middlings or tailings through a first heavy tangential flow parallel hydrocyclone overflow port (12a), a second heavy tangential flow parallel hydrocyclone overflow port (12b) and a terminal parallel hydrocyclone overflow port (15);
coal particles with relatively coarse particle sizes and medium-high density gangue intergrowth particles are respectively discharged into a first buffer chamber (17-1), a second buffer chamber (17-2) and a third buffer chamber (17-3) which are separated by a detachable first partition plate (22a) and a detachable second partition plate (22b) in a parallel hydrocyclone buffer tank (17) through a first heavy tangential flow parallel hydrocyclone underflow port (13a), a second heavy tangential flow parallel hydrocyclone underflow port (13b) and a terminal parallel hydrocyclone underflow port (16) which are arranged above the parallel hydrocyclone buffer tank (17), the first buffer chamber (17-1), the second buffer chamber (17-2) and the third buffer chamber (17-3) and are lower than the parallel hydrocyclone buffer tank (17), the second buffer chamber (17-2) and the third buffer chamber (17-3) The upper edges of the flushing pool (17), the first buffer chamber (17-1), the second buffer chamber (17-2) and the third buffer chamber (17-3); monitoring the concentration of the coal slurry water in the first buffer chamber (17-1), the second buffer chamber (17-2) and the third buffer chamber (17-3) in real time by using an ore slurry concentration meter;
and (2) mixing the slime water in the first buffer chamber (17-1), the second buffer chamber (17-2) and the third buffer chamber (17-3) by using a buffer pool slime pump (18) or independently pumping the slime water into a pulp stirring barrel, and automatically flowing the slime water after stirring and uniformly mixing into a flotation machine (20) or a liquid-solid fluidized bed separator (21) for separation.
2. The coal slime pre-desliming separation process of claim 1, wherein in a mixing tank in front of the flotation machine (20), water is added for dilution to ensure that the concentration of the coal slime is controlled to be 75-110 g/L, and the collecting agent and the foaming agent are sequentially and quantitatively added, and in the separation process, in the mixing tank in front of the liquid-solid fluidized bed separator (21), water is added for dilution to ensure that the concentration of the coal slime is controlled to be 300-450 g/L.
3. The coal slime pre-desliming separation process of claim 1, wherein the overflow ports (12a) of the first heavy tangential flow parallel hydrocyclone, the overflow ports (12b) of the second heavy tangential flow parallel hydrocyclone and the overflow ports (15) of the terminal parallel hydrocyclone are all arranged in an umbrella shape, and if the materials are arranged in a column shape, the pressure in the feeding pressure stabilizing pipe (5) is adjusted by adjusting the flow of the feeding slurry pump (4).
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| CN201437597U (en) * | 2009-07-21 | 2010-04-14 | 中交上海航道勘察设计研究院有限公司 | Device for improving stowed mud concentration of high drag suction dredger |
| CN201516384U (en) * | 2009-10-23 | 2010-06-30 | 山东青州微粉有限公司 | Powder grading device in wet method |
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| CN103831163B (en) * | 2012-11-20 | 2015-10-28 | 辽宁工程技术大学 | Coal slurry flotation is process for discarding tailings in advance |
| CN103350027B (en) * | 2013-08-06 | 2015-08-05 | 煤炭科学研究总院唐山研究院 | Graded desliming pressurized feeding three products heavy medium cyclone coal preparation technique |
| CN104525358A (en) * | 2014-12-22 | 2015-04-22 | 纪玉华 | Process of coarse coal slime back washing in pre-desliming dense medium cyclone sorting |
| CN105689154B (en) * | 2016-04-05 | 2018-03-06 | 安徽理工大学 | A kind of black water flotation unit and technique |
| EP3412754B1 (en) * | 2017-06-08 | 2020-08-05 | L'air Liquide, Société Anonyme Pour L'Étude Et L'exploitation Des Procédés Georges Claude | Fine coal charge for a fixed bed pressure gasifier |
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| CN109225611B (en) * | 2018-11-28 | 2020-06-05 | 中国矿业大学 | Coarse slime separating system and process of three-product liquid-solid fluidized bed |
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| CN210875832U (en) * | 2019-10-25 | 2020-06-30 | 威海市海王旋流器有限公司 | Uniform feeding system with multiple hydrocyclones connected in parallel |
| CN111215236A (en) * | 2020-03-10 | 2020-06-02 | 威海市海王科技有限公司 | Coal gasification ash gravity separation system and gravity separation process |
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