CN113042199A - Combined separation method for refractory iron oxide ores - Google Patents
Combined separation method for refractory iron oxide ores Download PDFInfo
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- CN113042199A CN113042199A CN202110342442.4A CN202110342442A CN113042199A CN 113042199 A CN113042199 A CN 113042199A CN 202110342442 A CN202110342442 A CN 202110342442A CN 113042199 A CN113042199 A CN 113042199A
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Abstract
The invention provides a combined sorting method of refractory iron oxide ore, which adopts a combined sorting process of strong magnetic separation and cation reverse flotation for low-iron-grade refractory iron oxide ore, and firstly performs strong magnetic separation between 200-mesh content 45% and 65% of a ground ore product, thereby being beneficial to improving the recovery rate of strong magnetic concentrate iron and reducing iron ore loss caused by over grinding of part of ore samples, and further reducing the iron grade of strong magnetic tailings. Secondly, the strong magnetic rough concentrate is reground and reversely floated, so that the iron grade of the concentrate is improved, the content of SiO2 in the concentrate is reduced, and high-quality iron concentrate is provided for iron making. The invention adjusts the lump ore processing flow from roasting-grinding-weak magnetic separation-reverse flotation flow to grinding-strong magnetic separation-reverse flotation flow, reduces the roasting part, thereby reducing the processing cost of the ore, reducing the environmental pollution and improving the essential safety coefficient of the mineral processing technology.
Description
Technical Field
The invention belongs to the technical field of mineral processing, and relates to a combined sorting method for refractory iron oxide ores.
Background
The refractory iron oxide ore is weakly magnetic iron ore in mineral processing, the weakly magnetic iron mineral comprises siderite, specularite and limonite, the main gangue is jade, quartz, dolomite, barite and the like, and the hardness, specific gravity and specific magnetization coefficient of the ore are shown in table 1.
TABLE 1 main mineralogical Properties of refractory oxidized ore
According to the data in the table, the analysis of the hardness indexes shows that the jade and the quartz have high hardness and are relatively difficult to grind, the grinding products mainly exist in coarse fraction, the limonite and siderite have low hardness, and the grinding products mainly exist in fine fraction; from the specific magnetization coefficient measurement result, the specific magnetization coefficients of the jade, the lime-green phyllite and the iron dolomite have smaller differences with the limonite and the siderite, and are combined with a magnetic force formula of ore particles in a magnetic field: f. ofm=μ0K.V.H.grad (H), it can be seen that the single strong magnetic separation has the following problems: firstly, the jade with coarse particles is easy to enter magnetic concentrate, so that the iron grade of the magnetic concentrate is low, and the content of silicon dioxide is highThe non-magnetic separation process is adopted to improve the quality and reduce the slag, and the fine-grained limonite and siderite in the ground product are lost in tailings due to low magnetic force in a magnetic field, so that the tailings are high in grade and the recovery rate of magnetic concentrate is low.
In addition, as the concentrating mill mainly treats the specularite and the mountain iron ore, lump ores (the diameter is 100-15mm) in production are treated by adopting a combined roasting-magnetic separation-reverse flotation process, the ore is treated by the classic energy-saving and consumption-reducing theory of 'throwing early throwing, magnetic non-floating and floating non-burning' of iron ore concentration, and the problems of high cost and large carbon emission exist in the process flow of lump ore separation.
Disclosure of Invention
The invention aims to provide a combined sorting method of refractory iron oxide ores, which aims to solve the problems of high cost and large carbon emission in the process flow of lump ore sorting.
Therefore, the invention adopts the following technical scheme:
a combined separation method for refractory iron oxide ores comprises the following steps:
A. crushing raw ore to obtain fine particles with the diameter of less than 3mm, and then grinding the fine particles in a ball mill, wherein the content of-200 meshes in the ground ore accounts for 45-65%;
B. b, performing strong magnetic separation on the ground ore products in the step A by using a Jones-imitating strong magnetic separator to obtain strong magnetic separation rough concentrate and strong magnetic tailings;
C. b, performing secondary grinding on the strong magnetic rough concentrate in the step B, wherein the content of-300 meshes in a reground product accounts for 88-95%;
D. performing reverse flotation on the reground product obtained in the step C by adopting a YG-328B cationic collector to improve quality and reduce slag to obtain low-silicon flotation iron concentrate and flotation tailings;
E. and D, combining the strong magnetic separation tailings in the step B and the flotation tailings in the step D into comprehensive tailings and discarding the comprehensive tailings.
Further, the raw ores in the step A comprise siderite, specularite, limonite, iron dolomite, jasper, quartz, barite and phyllite.
Further, the iron grade of the raw ore in the step A is 25% -35%.
Further, the process flow of the strong magnetic separation in the step B is rough scanning, the magnetic separation intensity of the strong magnetic separator is 0.8T-1.3T, the concentration of the ore pulp is 30% -40%, and the flow rate of concentrate washing water in the rough separation process is 5-15 kg/min.
Furthermore, the flotation process flow in the step D is a coarse-fine four-sweep closed circuit, the concentration of flotation pulp is 25% -35%, the dosage of YG-328B medicament is 140g/t-160g/t, starch is added as a regulator in the flotation process, and the dosage of the starch is 1500g/t-2000 g/t.
The invention has the beneficial effects that:
the invention adopts a combined separation process of strong magnetic separation and cation reverse flotation for low-iron-grade refractory iron oxide ore, and the strong magnetic separation is firstly carried out between 200 meshes of ore grinding products and 45 to 65 percent of the ore grinding products, so that the recovery rate of strong magnetic concentrate iron is favorably improved, the iron ore loss caused by over grinding of part of ore samples is reduced, and the iron grade of the high magnetic rougher tailings is reduced. Secondly, regrinding and reverse flotation are carried out on the rough concentrate subjected to strong magnetic separation, so that the iron grade of the concentrate is improved, and SiO in the concentrate is reduced2And (4) content, providing higher-quality iron ore concentrate for iron making. Finally, the invention adjusts the lump ore processing flow from roasting-ore grinding-weak magnetic separation-reverse flotation flow to ore grinding-strong magnetic separation-reverse flotation flow, reduces the roasting part, and reduces the CO generated by coal gas combustion heating and coal gas reduction2The content of the mineral is reduced, thereby reducing the processing cost of the ore, reducing the carbon emission, reducing the environmental pollution and improving the intrinsic safety factor of the mineral processing technology.
Drawings
FIG. 1 is a schematic flow chart of the present invention.
Detailed Description
The technical scheme of the invention is described in the following by combining the attached drawings and an implementation method.
Example 1
The method adopts a refractory iron oxide ore combined separation method for refractory iron oxide ores with iron grade of 33.15 percent, wherein the main iron mineral is siderite, and then specularite and limonite, occasionally pyrite, and gangue minerals such as quartz, jade, barite and phyllite, and comprises the following steps:
A. crushing raw ore to obtain fine particles with the particle size of less than 3mm, and grinding the fine particles in a ball mill, wherein the content of-200 meshes in the ground ore accounts for 62.7 percent;
B. b, performing strong magnetic separation on the ground ore products in the step A by adopting a Jones-imitated strong magnetic separator, wherein the strong magnetic separation process is a rough scanning, the middling washing water is 7.2L/min, the rough magnetic separation intensity is 1.0T, the scavenging magnetic separation intensity is 1.2T, and the iron grade is 40.80% and SiO is obtained after the rough scanning2The high-intensity magnetic separation rough concentrate with the content of 13.66 percent and the high-intensity magnetic tailings with the iron grade of 12.85 percent have the high-intensity magnetic separation recovery rate of 89.39 percent;
C. b, performing secondary grinding on the strong magnetic rough concentrate in the step B, wherein the content of-300 meshes in a reground product is 92.7%;
D. and D, performing reverse flotation, quality improvement and slag reduction on the reground product obtained in the step C by adopting YG-328B cationic collector, wherein the flotation process flow is a coarse-fine four-sweep closed circuit, the dosage of the coarse starch during flotation is 1500g/t, the dosage of the collector during flotation is 94g/t, the dosage of the fine collector during flotation is 46g/t, no medicament is added during scavenging, and the coarse-fine four-sweep closed circuit is used for obtaining the product with the iron grade of 46.32 percent and the SiO grade2The low-silicon flotation iron concentrate with the content of 3.88 percent and the flotation tailings with the iron grade of 16.06 percent have the operation recovery rate of the metallic iron in the flotation concentrate of 93.03 percent;
E. combining the strong magnetic separation tailings in the step B and the flotation tailings in the step D into comprehensive tailings with iron grade of 13.69% and discarding the comprehensive tailings.
Example 2
The method for sorting refractory iron oxide ores is used for the refractory iron oxide ores with the iron grade of 32.30 percent, main iron minerals of specularite, siderite and limonite, gangue minerals of quartz, jade, barite and phyllite, and comprises the following steps:
A. crushing raw ore to obtain fine particles with the particle size of less than 3mm, and grinding the fine particles in a ball mill, wherein the content of-200 meshes in the ground ore accounts for 47.8 percent;
B. b, performing strong magnetic separation on the ground ore products in the step A by using a Jones-imitating strong magnetic separator, wherein the strong magnetic separation process is a rough sweep, middling washing water is 6.5L/min, the rough magnetic separation intensity is 1.0T, and the scavenging magnetic separation intensity is 1.1T, so that the iron grade is 42.13%, and SiO is obtained2The content was 11.19 percent of the high-intensity magnetic separation rough concentrate and the high-intensity magnetic tailings with the iron grade of 10.10 percent, and the high-intensity magnetic separation recovery rate is 90.40 percent;
C. b, performing secondary grinding on the strong magnetic rough concentrate in the step B, wherein the content of-300 meshes in a reground product is 90.5%;
D. and D, performing reverse flotation, quality improvement and slag reduction on the reground product obtained in the step C by adopting YG-328B cationic collector, wherein the flotation process flow is a coarse-fine four-sweep closed circuit, the dosage of the rough selected starch is 2000g/t, the dosage of the collector is 110g/t, the dosage of the fine selected collector is 50g/t, no medicament is added in the scavenging process, and the iron grade is 46.42%, and the SiO content is obtained2The low-silicon flotation iron concentrate with the content of 3.51 percent and the flotation tailings with the iron grade of 20.01 percent have the operation recovery rate of metal iron of the flotation concentrate of 92.29 percent;
E. combining the strong magnetic separation tailings in the step B and the flotation tailings in the step D into comprehensive tailings with iron grade of 12.76% and discarding the comprehensive tailings.
The grade indexes of the raw ore and the concentrate in the invention and the original process flow are compared and shown in table 2, and the comparative analysis of the flotation concentrate multielement in the invention and the original process flow is shown in table 3.
TABLE 2 comparison of different Process flow indexes
TABLE 3 flotation concentrate multielement analysis results (unit:%)
As can be seen from Table 2, the recovery rate of metallic iron in the present invention is similar to that in the conventional process.
As shown in Table 3, the main factors influencing the iron grade of the concentrate of the present invention include the loss on ignition and the carbon content in the concentrate, and after the loss on ignition in the concentrate is subtracted, the iron grade of the present invention is 58.49%, and SiO is2The content is 4.88 percent, which is 57.80 percent of the iron grade and SiO in the traditional ore sorting process2Compared with the content of 5.68 percent, the indexes of other elements of the invention are superior to those of roasting magnetic separation-flotation concentrate.
Claims (5)
1. A combined separation method for refractory iron oxide ores is characterized by comprising the following steps:
A. crushing raw ore to obtain fine particles with the diameter of less than 3mm, and then grinding the fine particles in a ball mill, wherein the content of-200 meshes in the ground ore accounts for 45-65%;
B. b, performing strong magnetic separation on the ground ore products in the step A by using a Jones-imitating strong magnetic separator to obtain strong magnetic separation rough concentrate and strong magnetic separation tailings;
C. b, carrying out secondary grinding on the coarse concentrate subjected to the strong magnetic separation in the step B, wherein the content of-300 meshes in a reground product accounts for 88-95%;
D. performing reverse flotation on the reground product obtained in the step C by adopting a YG-328B cationic collector to improve quality and reduce slag to obtain low-silicon flotation concentrate and flotation tailings;
E. and D, combining the strong magnetic separation tailings in the step B and the flotation tailings in the step D into comprehensive tailings and discarding the comprehensive tailings.
2. The method for jointly sorting refractory iron oxide ores according to claim 1, wherein the raw ores in the step A comprise siderite, specularite, limonite, iron dolomite, jadeite, quartz, barite and phyllite.
3. The method for jointly sorting refractory iron oxide ores according to claim 1, wherein the iron grade of the raw ores in the step A is 25-35%.
4. The combined sorting method for the refractory iron oxide ores according to claim 1, wherein the process flow of the strong magnetic separation in the step B is a rough sweep, the magnetic separation intensity of a strong magnetic separator is 0.8T-1.3T, the concentration of the ore pulp is 30% -40%, and the flow rate of concentrate washing water is 5-15 kg/min.
5. The method according to claim 1, wherein the flotation process in step D is a coarse-fine four-pass closed circuit, the pulp concentration is 25% -35%, the YG-328B agent dosage is 120g/t-160g/t, starch is added as a modifier during the flotation process, and the starch dosage is 1500g/t-2000 g/t.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114433353A (en) * | 2021-12-22 | 2022-05-06 | 长安大学 | Grading magnetic separation device based on iron tailing grade |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114433353A (en) * | 2021-12-22 | 2022-05-06 | 长安大学 | Grading magnetic separation device based on iron tailing grade |
| CN114433353B (en) * | 2021-12-22 | 2024-01-30 | 长安大学 | Hierarchical magnetic separation device based on iron tailing grade |
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