CN111013811A - Thickness separation-gravity-magnetic combined mineral separation process for treating Anshan type iron ore - Google Patents
Thickness separation-gravity-magnetic combined mineral separation process for treating Anshan type iron ore Download PDFInfo
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- 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
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- B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
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Abstract
The invention relates to a combined ore dressing process of thickness separation-gravity-magnetic separation for processing Anshan type iron ore, which comprises the following steps of fine separation, first-stage closed circuit grinding, thickness classification, gravity separation and magnetic separation, and is characterized in that: the improvement of the invention comprises that a roller grinding-ball milling-grading flow is adopted to replace a fine grinding-ball milling-grading flow; adding the side tail product of the coarse snail into the fine grain product for sorting; the pre-classification before the regrinding machine is cancelled; the fine grain product is treated by two-stage continuous low-intensity magnetic separation and fine grain reselection operation instead of reverse flotation operation. The grade of the raw ore is 27 to 31 percent, the final fine grade is 66.5 to 67.3 percent, and the final tail grade is 7 to 8.5 percent. The advantages are that: 1) the ore grinding efficiency is improved, and the machine time is increased; 2) the coarse spiral edge tail is treated by a fine grain product, so that the loss of magnetic fine iron minerals in sweeping is reduced; 3) qualified concentrate is produced by two sections of weak magnetism, and the production cost is reduced. 4) The fine particle reselection replaces reverse flotation, so that the medicament cost and the ore pulp heating energy consumption are saved.
Description
Technical Field
The invention belongs to the technical field of mineral processing, and particularly relates to a combined ore dressing process of thickness separation-gravity-magnetism for treating saddletree iron ore.
Background
The Anshan mountain type iron ore is one of main iron ore resources in China. Under the severe situation of the current global iron and steel industry, the enhancement of the high-efficiency utilization of the Anshan-type iron ore is particularly important.
The Anshan-type iron ore is a high-silicon lean iron ore which is impregnated with fine particles, generally contains about 30% of iron and 40% -50% of silicon dioxide. The main metal minerals comprise magnetite, pseudomorphic (or semi-pseudomorphic) hematite and hematite, and sometimes contain a small amount of limonite, specularite, siderite and the like; the gangue minerals are mainly quartz, and silicate minerals such as hornblende, biotite or pyroxene. The ore is characterized in that:
1) the iron minerals and the gangue minerals are closely embedded, the dip-dyeing granularity is fine, the monomer can be dissociated only when the ore is ground to-0.074 mm and accounts for more than 85 percent, and the monomer can be dissociated only when some ore which is subjected to fine particle dip-dyeing is ground to-0.054 mm and accounts for more than 85 percent;
2) most of the ores are in a strip-shaped structure, and a few of the ores are in a compact block shape. In the ore layer, the iron mineral accounts for 70-75%, and the quartzite accounts for 25-30%; in an interlayer between the ore layer and the ore layer, the quartzite accounts for 80-85%, and the iron mineral accounts for 15-20%;
3) the development of ores is difficult due to the fact that the properties of the ores are frequently fluctuated due to the fact that the thicknesses of ore layers and interlayers in the ore deposit are changed, and the inlaid particle size of iron minerals is uneven. And as the mining depth of the ore increases, the magnetic rate of the ore is obviously increased.
The most common process flow for separating the Anshan-type iron ore at present is a stage grinding, coarse and fine separation, gravity separation, magnetic separation and anion reverse flotation process, and the process can be used for respectively recovering iron minerals with different size fractions in a targeted manner, so that a better separation index is obtained. As shown in figure 1, the method is a general process flow of the Anshan-type iron ore.
However, the process has significant problems as follows:
1) the yield of the concentrate in the low-cost gravity separation operation is low, and more than 50 percent of the concentrate is produced by the high-cost flotation operation;
2) because the magnetic field intensity in sweeping is lower, the fine-grained iron minerals dissociated by the monomers in the fed materials can not be effectively recovered, so that the content of the fine-grained iron minerals in tailings is too high, the separation cost of the Anshan-type iron ores is increased, and the resource waste is also caused. Patent CN201510743081.9 also proposes that coarse spiral edge tails do not impart magnetism to the sweeping to reduce the loss of fine fraction iron minerals after monomer dissociation;
3) the grading efficiency of the pre-grading operation before regrinding is extremely low, only less than 20 percent, and the pre-grading effect is not exerted;
4) the cost of the reagent in the reverse flotation operation is high, and the ore pulp heating flotation causes a large amount of energy loss and brings environmental pressure.
Disclosure of Invention
The invention aims to provide a Anshan type iron ore thickness separation-gravity-magnetic combined ore dressing process, which is suitable for the gradual rising change of the magnetic rate of iron ore along with the increase of the mining depth of a stope, overcomes the defects in the prior art, realizes the rationalization and simplification of the process flow, saves energy, reduces consumption and reduces the production cost.
The purpose of the invention is realized by the following technical scheme:
the invention relates to a combined ore dressing process of coarse and fine separation-gravity-magnetic separation for processing saddle-hill iron ore, which comprises fine separation, first-stage closed circuit grinding, coarse and fine classification, gravity separation and magnetic separation, and is characterized in that: the method comprises the following steps:
1) feeding the crushed product with the grade of 27-31% and the granularity of-30 mm into a high-pressure roller mill, returning the rim charge with the yield of 12-15% on both sides of the roller surface of the high-pressure roller mill to the high-pressure roller mill for crushing to form closed circuit crushing of the high-pressure roller mill, feeding the qualified product crushed by the high-pressure roller mill below-5 mm into a first closed circuit grinding ore formed by a first-section ball mill and a first-section grading cyclone to obtain a first-stage grading overflow product with the content of-0.074 mm of 50-60%,
2) feeding the primary graded overflow product into a coarse and fine grading cyclone, and controlling the separation granularity d5020-25 mu m to obtain coarse grain products with-0.074 mm content of 40-45 percent and fine grain products with-0.074 mm content of 85-95 percent,
3) coarse grain products are fed into a coarse-flotation spiral chute, a fine-flotation spiral chute and a middle sweeping magnetic machine to form coarse grain reselection operation, the coarse-flotation spiral chute and the fine-flotation spiral chute are both three products, concentrate of the coarse-flotation spiral chute is fed into the fine-flotation spiral chute, middlings of the coarse-flotation spiral chute are fed into the middle sweeping magnetic machine to be thrown, side tail products of the coarse-flotation spiral chute are combined with fine grain products of a coarse-and-fine grading cyclone, the concentrate of the fine-flotation spiral chute is qualified coarse grain reselection concentrate, middlings of the fine-flotation spiral chute are self-circulated, the side tail products of the fine-flotation spiral chute and the concentrate of the middle sweeping magnetic machine are mixed and fed into a two-section open circuit ore grinding operation, and two-section open circuit ground products with the content of-0.074 mm being 70% -80%;
4) mixing fine grain products with the side tail products of the roughing spiral chute, feeding the mixture into a weak magnetic machine I for roughing, feeding the concentrate of the weak magnetic machine I into a weak magnetic machine II for concentrating, wherein the concentrate of the weak magnetic machine II is qualified fine grain magnetic separation concentrate, combining the tailings of the weak magnetic machine I and the tailings of the weak magnetic machine II, feeding the mixture into a primary thickener, feeding the underflow of the thickener into a strong magnetic machine to obtain the concentrate of the strong magnetic machine and the tailings of the strong magnetic machine, feeding the concentrate of the strong magnetic machine as the feed for fine grain reselection operation, throwing the tailings of the strong magnetic machine,
5) concentrating the concentrate of the strong magnetic separator by a secondary concentrator and then feeding the concentrate into fine grain reselection operation, wherein the fine grain reselection operation adopts a spiral chute or a centrifugal concentrator with a notch to obtain the concentrate of the fine grain reselection operation and tailings of the fine grain reselection operation, the concentrate of the fine grain reselection operation is qualified fine grain reselection concentrate, and the fine grain reselection tailings are returned to the primary concentrator and returned to the strong magnetic separator after being concentrated;
6) merging the coarse grain gravity concentrate, the fine grain magnetic concentrate and the fine grain gravity concentrate into final concentrate, wherein the iron grade of the final concentrate is 66.5-67.3%;
7) And (3) combining the medium magnetic tailings, the high magnetic tailings, the primary concentration overflow and the secondary concentration overflow into final tailings, wherein the iron grade of the final tailings is 7-8.5%.
The magnetic field intensity of the middle-sweeping magnetic machine is 3500 Oe-4000 Oe;
the field intensity of the weak magnetic machine I is 1800 Oe-2000 Oe, the field intensity of the weak magnetic machine II is 800 Oe-1200 Oe,
the magnetic field intensity of the strong magnetic machine is 8000 Oe-10000 Oe.
Compared with the prior art, the invention has the beneficial effects that:
1) the high-pressure roller grinding-ball grinding-grading process of returning the high-pressure roller mill rim charge is adopted for crushing grinding to replace the current fine grinding-ball grinding-grading process, so that the ore grinding cost can be effectively reduced, the monomer dissociation degree of an ore grinding product is improved, and the time of a ball mill is increased;
2) the primary gravity concentration roughing spiral chute increases the side tail product and is directly fed into weak magnetic-strong magnetic operation, so that the loss of fine-fraction iron minerals dissociated by monomers in the middle sweeping magnetic field can be reduced, meanwhile, the fine fraction does not enter the middle sweeping magnetic field and regrinding operation, so that the content of the fine fraction in the reground material is greatly reduced, and meanwhile, the grading efficiency of the pre-grading operation before the site regrinding is only less than 20%, so that the pre-grading operation before the regrinding is cancelled, and the cost is further reduced;
3) because the magnetic rate of the ore is obviously increased along with the deepening of the mining depth, qualified concentrate is directly produced by adopting two-stage low-intensity magnetic separation, and the production cost can be obviously reduced;
4) the fine grain gravity separation operation is used for replacing the reverse flotation operation, so that the cost of the flotation reagent and the energy consumption required by heating the flotation ore pulp can be greatly reduced.
Drawings
FIG. 1 is a process flow diagram of the present invention.
FIG. 2 is a process flow diagram of stage grinding, coarse and fine separation, gravity separation, magnetic separation and anion reverse flotation.
Detailed Description
The invention is further illustrated by the following figures and examples.
As shown in fig. 1, the combined ore dressing process of coarse and fine separation-gravity-magnetic separation for processing saddle-hill iron ore of the invention comprises fine crushing, first-stage closed circuit grinding, coarse and fine classification, gravity separation and magnetic separation, and is characterized in that: the method comprises the following steps:
1) feeding a crushed product with the grade of 29.57% and the granularity of-30 mm into a high-pressure roller mill, returning the rim charge with the yield of 28% on two sides of the roller surface of the high-pressure roller mill to the high-pressure roller mill for crushing again to form closed circuit crushing of the high-pressure roller mill, feeding the qualified product crushed by the high-pressure roller mill with the diameter of below-5 mm into a first closed circuit grinding ore formed by a first-section ball mill and a first-section grading cyclone to obtain a first-stage grading overflow product with the content of-0.074 mm of 55%,
2) feeding the primary graded overflow product into a coarse and fine grading cyclone, and controlling the separation granularity d50At 22 μm, a coarse product with a content of-0.074 mm of 43% and a fine product with a content of-0.074 mm of 87% were obtained, the yield of coarse product being 79.89% and the yield of fine product being 20.11%;
3) coarse grain products are fed into a coarse-concentration spiral chute, a fine-concentration spiral chute and a middle sweeping magnetic machine, wherein the coarse-concentration spiral chute and the fine-concentration spiral chute are both three products, concentrate of the coarse-concentration spiral chute is fed into the fine-concentration spiral chute, middlings of the coarse-concentration spiral chute are fed into the middle sweeping magnetic machine for discarding tailings, side-tail products of the coarse-concentration spiral chute are combined with fine-particle products of a coarse-and-fine grading cyclone, the concentrate of the fine-concentration spiral chute is qualified coarse-particle gravity concentrate, middlings of the fine-concentration spiral chute are self-circulated, the side-tail products of the fine-concentration spiral chute and the concentrate of the middle sweeping magnetic machine are mixed and fed into a two-section open-circuit ore grinding operation, the magnetic field intensity of the middle sweeping magnetic machine is 3500 Oe-4000 Oe, a two-section open-circuit ore grinding product with the content of-0.074;
the grade of the coarse gravity concentrate is 67.15%, the recovery rate is 60.36%, and the yield is 26.58%;
4) mixing fine grain products and the side tail products of the roughing spiral chute, feeding the mixture into a weak magnetic machine I for roughing, feeding the concentrate of the weak magnetic machine I into a weak magnetic machine II for concentrating, wherein the concentrate of the weak magnetic machine II is qualified fine grain magnetic separation concentrate, combining the tailings of the weak magnetic machine I and the tailings of the weak magnetic machine II, feeding the mixture into a primary thickener, controlling the magnetic field strength of the weak magnetic machine I to be 1800 Oe-2000 Oe, controlling the magnetic field strength of the weak magnetic machine II to be 800 Oe-1200 Oe, feeding the underflow of the thickener into a strong magnetic machine to obtain the concentrate of the strong magnetic machine and the tailings of the strong magnetic machine, using the concentrate of the strong magnetic machine as the feed for fine grain reselection operation, and throwing the tailings of the strong magnetic machine;
the grade of the fine-grain magnetic concentrate is 67.35%, the recovery rate is 4.01%, and the yield is 1.76%;
5) concentrate of the strong magnetic separator is concentrated by a secondary concentrator and then fed into fine grain reselection operation, the fine grain reselection operation adopts a spiral chute with a notch, the magnetic field intensity of the strong magnetic separator is 8000 Oe-10000 Oe, fine grain reselection concentrate and fine grain reselection tailings are obtained, the concentrate of the fine grain reselection operation is qualified fine grain reselection concentrate, and the fine grain reselection tailings are returned to the primary concentrator and returned to the strong magnetic separator after being concentrated;
the grade of the fine grain gravity concentrate is 64.77%, the recovery rate is 16.58%, and the yield is 7.57%;
6) the coarse grain gravity concentrate, the fine grain magnetic concentrate and the fine grain gravity concentrate are combined into final concentrate, the iron grade of the final concentrate is 66.66 percent of the iron grade, the iron recovery rate is 80.95 percent, the yield is 35.91 percent,
7) and (3) combining the medium magnetic tailings, the high magnetic tailings, the primary concentration overflow and the secondary concentration overflow into final tailings, wherein the iron grade of the final tailings is 8.2%.
The invention replaces the reverse flotation operation with the fine grain gravity separation operation, and can greatly reduce the cost of the flotation reagent and the energy consumption required by the heating of the flotation ore pulp.
Claims (4)
1. The combined ore dressing process of coarse and fine separation-gravity-magnetic separation for processing the Anshan-type iron ore comprises fine crushing, one-section closed circuit grinding, coarse and fine classification, gravity separation and magnetic separation, and is characterized in that: the method comprises the following steps:
1) feeding a crushed product with the grade of 27-31% and the granularity of-30 mm-0 mm into a high-pressure roller mill, returning the edge materials with the yield of 12-15% on two sides of the roller surface of the high-pressure roller mill to the high-pressure roller mill for crushing to form closed circuit crushing of the high-pressure roller mill, feeding the qualified crushed product of the high-pressure roller mill with the diameter of-5 mm below into a first closed circuit grinding system consisting of a first-section ball mill and a first-section grading cyclone to obtain a first-stage grading overflow product with the content of-0.074 mm of 50-60%;
2) feeding the primary graded overflow product into a coarse and fine grading cyclone, and controlling the separation granularity d5020-25 μm, to obtain-0.074 mm coarse grain product with content of 40-45% and-0.074 mm fine grain product with content of 85-95%,
3) coarse grain products are fed into a coarse-concentration spiral chute, a fine-concentration spiral chute and a middle sweeping magnetic machine, wherein the coarse-concentration spiral chute and the fine-concentration spiral chute are three products, concentrate of the coarse-concentration spiral chute is fed into the fine-concentration spiral chute, middlings of the coarse-concentration spiral chute are fed into the middle sweeping magnetic machine for tail throwing, side tail products of the coarse-concentration spiral chute are combined with fine grain products of a coarse-and-fine grading cyclone, the concentrate of the fine-concentration spiral chute is qualified coarse-particle gravity concentrate, middlings of the fine-concentration spiral chute are self-circulated, the side tail products of the fine-concentration spiral chute and the concentrate of the middle sweeping magnetic machine are mixed and fed into a two-section open-circuit ore grinding operation to obtain a two-section open-circuit ore grinding product with the content of-0.074 mm of 70-80%,
4) mixing fine grain products with the side tail products of the roughing spiral chute, feeding the mixture into a weak magnetic machine I for roughing, feeding the concentrate of the weak magnetic machine I into a weak magnetic machine II for concentrating, wherein the concentrate of the weak magnetic machine II is qualified fine grain magnetic separation concentrate, combining the tailings of the weak magnetic machine I and the tailings of the weak magnetic machine II, feeding the mixture into a primary thickener, feeding the underflow of the thickener into a strong magnetic machine to obtain the concentrate of the strong magnetic machine and the tailings of the strong magnetic machine, feeding the concentrate of the strong magnetic machine as the feed for fine grain reselection operation, throwing the tailings of the strong magnetic machine,
5) concentrating the concentrate of the strong magnetic separator by a secondary concentrator and then feeding the concentrate into fine grain reselection operation, wherein the fine grain reselection operation adopts a spiral chute or a centrifugal concentrator with a notch to obtain the concentrate of the fine grain reselection operation and tailings of the fine grain reselection operation, the concentrate of the fine grain reselection operation is qualified fine grain reselection concentrate, and the fine grain reselection tailings are returned to the primary concentrator and returned to the strong magnetic separator after being concentrated;
6) the coarse grain gravity concentration concentrate, the fine grain magnetic concentration concentrate and the fine grain gravity concentration concentrate are combined into final concentrate, and the iron grade of the final concentrate is 66.5% -67.3%;
7) the medium magnetic tailings, the high magnetic tailings, the primary concentration overflow and the secondary concentration overflow are combined into final tailings, and the iron grade of the final tailings is 7% -8.5%.
2. The combined ore dressing process of the thickness separation-gravity-magnetic separation for treating the Anshan-type iron ore according to claim 1, wherein the magnetic field intensity of the scavenging magnetizer is 3500 Oe-4000 Oe.
3. The combined ore dressing process of thickness separation-gravity-magnetic separation for processing Anshan-type iron ore according to claim 1, wherein the magnetic field strength of the weak magnetic machine I is 1800 Oe-2000 Oe, and the magnetic field strength of the weak magnetic machine II is 800 Oe-1200 Oe.
4. The combined ore dressing process of the thickness separation-gravity-magnetic separation for processing the Anshan-type iron ore according to claim 1, wherein the magnetic field intensity of the strong magnetic machine is 8000 Oe-10000 Oe.
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Cited By (7)
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| CN112090579A (en) * | 2020-09-16 | 2020-12-18 | 安徽马钢张庄矿业有限责任公司 | Efficient iron concentrate powder sorting process |
| CN113042194A (en) * | 2021-03-19 | 2021-06-29 | 鞍钢集团北京研究院有限公司 | Mineral separation process for hematite |
| CN113042196A (en) * | 2021-03-19 | 2021-06-29 | 鞍钢集团北京研究院有限公司 | Mineral separation process for hematite |
| CN113042195A (en) * | 2021-03-19 | 2021-06-29 | 鞍钢集团北京研究院有限公司 | Ore dressing process of hematite through coarse-fine classification-gravity-magnetic-reverse flotation |
| CN113953080A (en) * | 2021-09-01 | 2022-01-21 | 鞍钢集团北京研究院有限公司 | Beneficiation method for mixed iron ore |
| CN114653472A (en) * | 2022-03-17 | 2022-06-24 | 中钢集团马鞍山矿山研究总院股份有限公司 | Magnetic-floating combined mineral separation new process for ultrafine grained hematite |
| WO2024040656A1 (en) * | 2022-08-26 | 2024-02-29 | 鞍钢集团矿业有限公司 | Anshan maghemite segmented ore grinding and gravity-magnetic process flow |
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| CN112090579A (en) * | 2020-09-16 | 2020-12-18 | 安徽马钢张庄矿业有限责任公司 | Efficient iron concentrate powder sorting process |
| CN113042194A (en) * | 2021-03-19 | 2021-06-29 | 鞍钢集团北京研究院有限公司 | Mineral separation process for hematite |
| CN113042196A (en) * | 2021-03-19 | 2021-06-29 | 鞍钢集团北京研究院有限公司 | Mineral separation process for hematite |
| CN113042195A (en) * | 2021-03-19 | 2021-06-29 | 鞍钢集团北京研究院有限公司 | Ore dressing process of hematite through coarse-fine classification-gravity-magnetic-reverse flotation |
| CN113953080A (en) * | 2021-09-01 | 2022-01-21 | 鞍钢集团北京研究院有限公司 | Beneficiation method for mixed iron ore |
| CN113953080B (en) * | 2021-09-01 | 2024-04-19 | 鞍钢集团北京研究院有限公司 | Mineral separation method of mixed iron ore |
| CN114653472A (en) * | 2022-03-17 | 2022-06-24 | 中钢集团马鞍山矿山研究总院股份有限公司 | Magnetic-floating combined mineral separation new process for ultrafine grained hematite |
| CN114653472B (en) * | 2022-03-17 | 2023-09-15 | 中钢集团马鞍山矿山研究总院股份有限公司 | Magnetic-floatation combined mineral separation novel process for ultrafine hematite ore |
| WO2024040656A1 (en) * | 2022-08-26 | 2024-02-29 | 鞍钢集团矿业有限公司 | Anshan maghemite segmented ore grinding and gravity-magnetic process flow |
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