CN111892063A - Pretreatment method of artificially synthesized mica raw material - Google Patents
Pretreatment method of artificially synthesized mica raw material Download PDFInfo
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- CN111892063A CN111892063A CN202010683778.2A CN202010683778A CN111892063A CN 111892063 A CN111892063 A CN 111892063A CN 202010683778 A CN202010683778 A CN 202010683778A CN 111892063 A CN111892063 A CN 111892063A
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B33/00—Silicon; Compounds thereof
- C01B33/20—Silicates
- C01B33/36—Silicates having base-exchange properties but not having molecular sieve properties
- C01B33/38—Layered base-exchange silicates, e.g. clays, micas or alkali metal silicates of kenyaite or magadiite type
- C01B33/42—Micas ; Interstratified clay-mica products
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2/00—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic
- B01J2/22—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic by pressing in moulds or between rollers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C21/00—Disintegrating plant with or without drying of the material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/08—Separating or sorting of material, associated with crushing or disintegrating
- B02C23/16—Separating or sorting of material, associated with crushing or disintegrating with separator defining termination of crushing or disintegrating zone, e.g. screen denying egress of oversize material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/08—Separating or sorting of material, associated with crushing or disintegrating
- B02C23/16—Separating or sorting of material, associated with crushing or disintegrating with separator defining termination of crushing or disintegrating zone, e.g. screen denying egress of oversize material
- B02C2023/165—Screen denying egress of oversize material
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- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Silicates, Zeolites, And Molecular Sieves (AREA)
Abstract
The invention discloses a pretreatment method of an artificially synthesized mica raw material, which comprises the following steps: s1: crushing and screening to obtain raw material components with consistent particle size range; s2: mixing the raw material components in proportion, and carrying out dry-method forced granulation on the mixed raw material to obtain mixed raw material tablets; s3: the mixed raw material pieces were crushed, and the crushed material of the mixed raw material pieces was charged into a mica kiln as a raw material. The pretreatment method of the artificially synthesized mica raw material adds the dry forced granulation and crushing procedures on the basis of the existing grinding raw material components, locks the distribution position of the raw material in the particles through the dry forced granulation, takes the crushed material as the raw material of the mica kiln, can overcome the influence of the specific gravity of different components, ensures that the mixing and the distribution of the raw material components are more uniform, and is beneficial to improving the quality of mica and the utilization rate of the raw material of the kiln.
Description
Technical Field
The invention relates to the technical field of artificial synthetic mica production, in particular to a pretreatment method of an artificial synthetic mica raw material.
Background
The internal heating method production process of the artificially synthesized mica comprises the following steps: mixing fused magnesia, quartz powder, potassium fluosilicate, alumina powder and potassium carbonate which are used as raw materials for synthesizing mica according to a certain proportion, adding the mixture into a high-temperature furnace formed by refractory bricks, melting part of raw materials by utilizing a heating electrode, enabling the melted melt to be conductive, completely melting the raw materials, cooling to separate out crystals, separating the blank from the crystals, crushing and screening the crystal part, and the like to obtain a mica product.
The prior art method for producing synthetic mica uses a trough mixer to mix raw materials and then fills the mixed raw materials into a prepared special container, as disclosed in CN 109179439A. Because the grain diameters of the raw material components are different, and the furnace body has a certain height, the falling speed of the raw material with large grain diameter in the flowing and falling process of the feeding and the furnace body is higher regardless of the feeding by air flow or screw rod, so that the raw material in the furnace body is not uniformly distributed before the raw material is melted, and the distribution is mainly shown in the height direction of the furnace body. In addition, at the interface between the molten raw material and the non-molten raw material, the raw material having a large weight and a large particle size is more likely to fall into the molten raw material. The reasons all result in uneven crystal distribution in the cooled and crystallized furnace charge, and the total amount of mica obtained by crushing and screening the furnace charge is low.
In an improvement of CN109179439A, as disclosed in CN109279617A, the raw material is first crushed and sieved by a grinder to obtain raw material components with the same particle size range, and then the components are mixed in proportion. The proposal carries out pre-grinding and screening treatment on each component of the raw materials, can ensure the fineness of the raw materials, has more uniform overall distribution after mixing, and has more uniform components and high product quality of mica crystals formed by subsequent reaction.
The technical scheme of CN109279617A still has the following technical defects:
firstly, although the particle diameters of the raw materials are consistent, the specific gravities of the particles of the raw materials are not consistent, and the hexagonal crystal relative density of potassium fluosilicate is 3.08 by taking the water density as reference; the relative density of cubic system crystal is 2.665(17 ℃), the relative density of alumina is about 3.7, the relative density of quartz sand is about 2.65, the relative density of potassium carbonate is 2.43, the relative density of fused magnesia is about 3.4, and the relative density is influenced by the composition difference of quartz sand and capacitance magnesia. The components with large specific gravity are fed more quickly in the feeding process, and the raw materials in the furnace are distributed unevenly due to the difference of the specific gravity of the particles, so that the mica quality is influenced;
secondly, the particle size of the raw material in CN109279617A is too small, the raw material is tightly filled in a furnace body, the gap of particles of the raw material is small, and the mica is not beneficial to discharge furnace gas in the melting process, namely, the discharge of impurities in the raw material;
thirdly, on the interface of the molten raw material and the unmelted raw material, the raw material particles are immersed in the molten raw material, so that the heat exchange area between the solid raw material and the molten raw material can be increased, and the heat exchange efficiency is improved. The smaller the particle size of the raw material is, the poorer the flowability is; and because the surface area of the particles soaked by the molten raw material is increased, the speed of the particles soaking into the molten raw material is slower, and the time for the whole furnace raw material to reach a molten state is further prolonged.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a pretreatment method of an artificially synthesized mica raw material, which fixes the positions of components in a mixed raw material by utilizing dry forced granulation, so that the raw material components in furnace burden are more uniformly distributed, and the quality of the artificially synthesized mica and the utilization rate of kiln raw materials are improved.
In order to achieve the technical effects, the technical scheme of the invention is as follows: a pretreatment method of artificially synthesized mica raw materials comprises the following steps:
s1: crushing and screening to obtain raw material components with consistent particle size range;
s2: mixing the raw material components in proportion, and carrying out dry-method forced granulation on the mixed raw material to obtain mixed raw material tablets;
s3: the mixed raw material pieces were crushed, and the crushed material of the mixed raw material pieces was charged into a mica kiln as a raw material.
The preferable technical scheme is that the particle size of the crushed material in the S3 is larger than that of the raw material component obtained by screening in the S1.
The preferable technical scheme is that the consistent particle size range of the raw material components in the S1 is 200-250 meshes.
The preferable technical scheme is that the particle size range of the crushed materials put into the mica kiln in S3 is 20-40 meshes.
The preferable technical scheme is that the main raw material components of the artificially synthesized mica are quartz sand, alumina powder, fused magnesia, potassium fluosilicate and potassium carbonate.
The preferable technical scheme is that the pair-roller pressure of the rolling granulator is 430-500 tons.
The invention has the advantages and beneficial effects that:
the pretreatment method of the artificially synthesized mica raw material adds the dry forced granulation and crushing procedures on the basis of the existing grinding raw material components, locks the distribution position of the raw material in the particles through the dry forced granulation, takes the crushed material as the raw material of the mica kiln, can overcome the influence of the specific gravity of different components, ensures that the mixing and the distribution of the raw material components are more uniform, and is beneficial to improving the quality of mica and the utilization rate of the raw material of the kiln.
Detailed Description
The following further describes embodiments of the present invention with reference to examples. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
The raw material components of the artificially synthesized mica are any one of the known combinations in the prior art, including but not limited to quartz sand, alumina powder, fused magnesite, potassium fluosilicate and potassium carbonate, and also can be fused magnesite, potassium fluosilicate, potassium feldspar and calcined kaolin in CN104876233A, quartz stone, magnesite, alumina powder, magnesium fluoride, potassium fluosilicate and potassium carbonate in CN109279617A, quartz sand, alumina powder, potassium carbonate, potassium nitrate, fused magnesite, potassium fluosilicate and the like in CN 110117815A.
The operation of crushing the raw materials can be based on the component with the smallest particle size, and the component with larger particle size is crushed and screened; all components may also be sieved to a certain particle size range for size reduction. The smaller the consistent particle size of the raw material components in S1 is, the better the particle size is, the smaller the particle size interval is, the preferable range is 150-300 meshes, and the preferable range is 200-250 meshes.
Dry high-pressure granulation is different from wet granulation and melt granulation, and does not need to add a binder and water into raw materials or to carry out melting treatment (decomposition of certain components), so that the granulation mode does not change the composition of the raw materials. The form of the product obtained by subjecting the mixed raw materials to forced granulation is not particularly limited, and is usually, for example, spherical granules (blocks), tablets, and the like.
The feed particle size of dry high-pressure granulation determines the bulk density of the raw material, and the bulk density and the high-pressure determine the density of the granules obtained by granulation. The density of the crushed material is properly increased to facilitate the speed of the crushed material to be immersed into the molten raw material at the interface between the molten and non-molten raw materials. In addition, the pressure of extrusion granulation during high pressure granulation exceeds the granule strength of the component granules, and also causes microcracks inside the granules, which contribute to the granules being heated and melted more quickly. Based on the same particle size distribution of the granulation raw material, an excessive pressure may result in an excessive particle density, which is disadvantageous for accelerating the melting.
In actual production, the connection path between the discharge port of the raw material component mixing equipment and the feed port of the high-pressure granulation equipment is controlled to be shortened so as to weaken the influence of specific gravity difference on the component mixing uniformity.
The crushed material of S3 needs to be controlled within a suitable particle size range. Too large particle size, too small specific surface area, unfavorable heat transfer, lead to the fusing speed to slow down, and the particle size is too small, and too large specific surface area is unfavorable for the particle to get into in the melting raw materials, also can lead to the fusing speed to slow down.
Examples 1 to 4
The pretreatment methods of the synthetic mica raw materials of examples 1 to 4 each include the following steps:
s1: crushing and screening to obtain raw material components with consistent particle size range;
s2: mixing the raw material components in proportion, and carrying out dry-method forced granulation on the mixed raw material to obtain mixed raw material tablets;
s3: the mixed raw material pieces were crushed, and the crushed material of the mixed raw material pieces was charged into a mica kiln as a raw material.
Examples 1-4 synthetic mica was prepared from the following raw materials and mixed in the following proportions:
the artificially synthesized mica raw material in the furnace body consists of 36 percent of quartz sand (the purity is more than or equal to 99 percent), 29 percent of magnesium oxide (the purity is more than or equal to 97 percent), 11 percent of aluminum oxide (the purity is more than or equal to 98.5 percent), 20 percent of potassium fluosilicate (the purity is more than or equal to 99 percent) and 4 percent of potassium carbonate (the purity is more than or equal to 98.5 percent).
In the embodiment 1, the particle size of the particles obtained by crushing and screening the five raw materials in S1 is 200-250 meshes, a rolling granulator is adopted in S2, the pressure of a pair roller is 400t, and the mixed raw material blocks obtained by granulation are oblate spheres with the size of about 10 mm; the size range of the crushed materials in the S3 is 20-40 meshes.
Example 2 is based on example 1 with the difference that: the particle size of particles obtained by crushing and screening the five raw materials in the S1 is 250-300 meshes;
example 3 is based on example 1 with the difference that: the size range of the crushed materials in the S3 is 40-70 meshes.
Example 4 is based on example 1 with the difference that: the roll pressure of the roll granulator was 500 tons.
Comparative example 1 raw materials which were not crushed were mixed and charged into a mica kiln;
comparative example 2 the components having the same particle size range as that of example 1S1 were mixed and charged into a mica kiln at one time;
the furnace height of the mica kiln used in the examples and the comparative examples is 2m, the inner diameter of the bottom of the furnace is 2.3m, the maximum inner diameter of the middle part of the furnace body is 2.8m, the feeding amount in the furnace body is 14000kg, and the feeding depth is 1.8 m;
the graphite heat-generating body includes the one end gathering of ignition stick (three ignition sticks) and ties up from top to bottom, and the other end and the first graphite rod of ignition stick tie up, and the material of tying up is graphite line and electric fuse), first graphite rod, second graphite rod (with first graphite rod threaded connection) and extend to the outer stick seat of furnace body (with second graphite rod threaded connection, pre-buried and wear to establish in the furnace body, be connected with the power outside the furnace), and the voltage of the power that the graphite rod was connected is 380V. The graphite heater component has the following dimensions:
an ignition rod: a high-purity graphite rod with the diameter of 15mm and the length of 300 mm;
a first graphite rod: a high-purity graphite rod with the diameter of 40mm and the length of 700 mm;
a second graphite rod: a high-purity graphite rod with the diameter of 80mm and the length of 800 mm;
a rod seat: 1300mm 160mm 50mm, high purity graphite plate.
The duration of the whole furnace melting and the mica furnace raw material utilization rate (mass of mica produced by crystallization/single furnace charge) of the examples and the comparative examples are 100 percent, and the detection results are as follows:
based on the same charge crushing and screening process, the quality of the finished mica product is measured by the mass ratio (R value) of plus 4 meshes to minus 4 meshes: the finished product is screened by a 4-mesh screen, the mica retained on the screen is of a plus 4-mesh, and the screened mica is of a minus 4-mesh. The examples and comparative examples have the following R values:
| example 1 | Example 2 | Example 3 | Example 4 | Comparative example 1 | Comparative example 2 | |
| R | 7.51:2.49 | 7.68:2.32 | 7.51:2.49 | 7.50:2.50 | 7.24:2.76 | 7.35:2.65 |
As can be seen from the above table, compared with comparative example 1 and comparative example 2, in example 1, the uniform distribution degree of each component in the furnace body raw material can be further improved, and the raw material utilization rate of the mica kiln is obviously improved.
The particle size of the crushed raw material in the embodiment 2 is smaller than that in the embodiment 1, the flowability of the raw material in the dry method forced granulation feeding process is small, the uniformity degree of each component is higher, and the utilization rate of the raw material of the mica kiln and the quality of the mica powder are both superior to those in the embodiment 1.
Compared with the example 1, the particle size of the crushed material is reduced, the melting time of the charge is longer, namely the power consumption of the melting process is increased, but the mica quality is not obviously changed in the example 3.
Compared with example 1, the pressure of the roller pair for granulating in example 4 is increased, the density of the crushed material is increased, the melting time of the furnace charge is longer, and the quality of the mica is not obviously changed.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the technical principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (6)
1. A pretreatment method of an artificially synthesized mica raw material is characterized by comprising the following steps:
s1: crushing and screening to obtain raw material components with consistent particle size range;
s2: mixing the raw material components in proportion, and carrying out dry-method forced granulation on the mixed raw material to obtain mixed raw material tablets;
s3: the mixed raw material pieces were crushed, and the crushed material of the mixed raw material pieces was charged into a mica kiln as a raw material.
2. The method of claim 1, wherein the particle size of the crushed material of S3 is larger than the particle size of the raw material components sieved in S1.
3. The method for pretreating synthetic mica raw material according to claim 1, wherein the uniform particle size of raw material components in S1 is in the range of 200-250 mesh.
4. The method for pretreating a raw material for synthetic mica according to claim 1, wherein the particle size of the crushed material charged into the mica kiln in S3 is in the range of 20 to 40 mesh.
5. The pretreatment method of an artificially synthesized mica raw material according to claim 1, wherein the artificially synthesized mica comprises quartz sand, alumina powder, fused magnesia, potassium fluosilicate and potassium carbonate as main raw material components.
6. The method for pretreating synthetic mica as recited in claim 1 or 4, wherein the roll pressure of said roll press granulator is 430 to 500 tons.
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| CN202010683778.2A CN111892063B (en) | 2020-07-16 | 2020-07-16 | Pretreatment method of artificially synthesized mica raw material |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115851001A (en) * | 2022-11-29 | 2023-03-28 | 安徽格锐新材料科技有限公司 | Synthetic mica powder, preparation method and application thereof in dry and wet dual-purpose powder cakes |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1532146A (en) * | 2003-03-19 | 2004-09-29 | 焦作市多氟多化工有限公司 | Method for producing granular cryolite |
| CN1533983A (en) * | 2003-03-29 | 2004-10-06 | 焦作市多氟多化工有限公司 | Production method of granular aluminium fluoride |
| CN109179439A (en) * | 2018-10-30 | 2019-01-11 | 安徽恒昊科技有限公司 | A kind of synthetic method of compound mica |
| CN109279617A (en) * | 2018-10-30 | 2019-01-29 | 安徽恒昊科技有限公司 | A kind of chemical synthesis process of mica |
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2020
- 2020-07-16 CN CN202010683778.2A patent/CN111892063B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1532146A (en) * | 2003-03-19 | 2004-09-29 | 焦作市多氟多化工有限公司 | Method for producing granular cryolite |
| CN1533983A (en) * | 2003-03-29 | 2004-10-06 | 焦作市多氟多化工有限公司 | Production method of granular aluminium fluoride |
| CN109179439A (en) * | 2018-10-30 | 2019-01-11 | 安徽恒昊科技有限公司 | A kind of synthetic method of compound mica |
| CN109279617A (en) * | 2018-10-30 | 2019-01-29 | 安徽恒昊科技有限公司 | A kind of chemical synthesis process of mica |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115851001A (en) * | 2022-11-29 | 2023-03-28 | 安徽格锐新材料科技有限公司 | Synthetic mica powder, preparation method and application thereof in dry and wet dual-purpose powder cakes |
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