CN115921093A - Separate grinding-magnetic levitation combined separation process for maghemite - Google Patents
Separate grinding-magnetic levitation combined separation process for maghemite Download PDFInfo
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- 238000000926 separation method Methods 0.000 title claims abstract description 48
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 title claims abstract description 24
- 238000005339 levitation Methods 0.000 title claims abstract description 11
- 239000012141 concentrate Substances 0.000 claims abstract description 69
- 238000000227 grinding Methods 0.000 claims abstract description 47
- 238000005188 flotation Methods 0.000 claims abstract description 34
- 238000000034 method Methods 0.000 claims abstract description 32
- 238000007885 magnetic separation Methods 0.000 claims abstract description 7
- 230000002000 scavenging effect Effects 0.000 claims description 9
- 239000006148 magnetic separator Substances 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 14
- 230000005484 gravity Effects 0.000 abstract description 12
- 230000000694 effects Effects 0.000 abstract description 3
- 238000002156 mixing Methods 0.000 abstract description 3
- 230000005285 magnetism related processes and functions Effects 0.000 abstract description 2
- 239000000047 product Substances 0.000 description 25
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 16
- 238000004458 analytical method Methods 0.000 description 8
- 229910052742 iron Inorganic materials 0.000 description 7
- 229910052500 inorganic mineral Inorganic materials 0.000 description 5
- 239000011707 mineral Substances 0.000 description 5
- 230000005389 magnetism Effects 0.000 description 4
- 238000003801 milling Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 239000002562 thickening agent Substances 0.000 description 3
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 2
- 229910004298 SiO 2 Inorganic materials 0.000 description 2
- 229910010413 TiO 2 Inorganic materials 0.000 description 2
- 150000001450 anions Chemical class 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000010419 fine particle Substances 0.000 description 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 2
- 238000004094 preconcentration Methods 0.000 description 2
- 238000012216 screening Methods 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- 238000000498 ball milling Methods 0.000 description 1
- 230000033558 biomineral tissue development Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
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Abstract
The invention relates to a separate grinding-magnetic levitation combined separation process of maghemite, which is characterized in that raw ore is divided into normal ore with the grade of 25% -30% and extremely poor ore with the grade of 20% -25%, and then the two kinds of ore are fed into the process treatment of the invention, and the process comprises the following steps: 1) Separately grinding: normal ore is fed into a main process for primary ore grinding and grading, weak magnetic and strong magnetic tailing throwing and secondary ore grinding and grading treatment; feeding extremely poor ores into a closed-circuit semi-autogenous grinding, coarse grain weak-magnetism strong-magnetism tailing discarding and two-stage continuous ore grinding and grading; 2) Selecting: the separately ground products are combined and fed into a two-stage weak magnetic strong magnetic tailing discarding process, a continuous weak magnetic process and a reverse flotation process, and the final concentrate grade is obtained to be over 67.5 percent. The invention has the advantages that: 1) The method is suitable for the property change of raw ores, normal ores and extremely poor ores are ground respectively, the coordination of ore blending can be realized, and the production is stable; 2) The gravity separation is cancelled, the reverse flotation is reserved, the ore grinding magnetic separation is enhanced, the combined separation of the ground products is realized, the flow is simplified, the separation effect is improved, and the production cost is reduced.
Description
Technical Field
The invention belongs to the technical field of iron ore dressing processes, and particularly relates to a separate grinding-magnetic levitation co-separation process for maghemite.
Background
At present, the main sorting process for processing the Anshan-type maghemite adopts the process flows of stage grinding, coarse and fine sorting, gravity separation, strong magnetism and anion reverse flotation. The process flow comprises the following specific production processes of ore grinding and sorting: feeding a crushed product (raw ore) with the granularity of 12-0mm into a primary closed circuit ore grinding system consisting of an overflow ball mill and a cyclone group, classifying the components of the cyclone into two materials with different thicknesses through primary overflow, feeding settled sand of the cyclone for coarse classification into three sections of spiral chutes for roughing, fine selection and scavenging to obtain gravity concentrate, feeding the tailings for scavenging the spiral to obtain gravity tailings, feeding the tailings for scavenging the spiral to obtain the gravity tailings, feeding the tailings for scavenging the spiral, the concentrate for scavenging the spiral and the concentrate for permanent magnetism and the concentrate for scavenging the magnetic ore into a secondary ore grinding-classifying system, and feeding the secondary classified overflow product as middling to the coarse classification operation again; feeding overflow products of the coarse and fine grading cyclone into a permanent magnet operation, feeding permanent magnet tailings into a thickener for concentration, feeding underflow of the permanent magnet tailings into a strong magnet machine through a section of deslagging screen, and discarding the strong magnet tailings; the permanent magnetic concentrate and the strong magnetic concentrate are combined and fed into a thickener for concentration, the underflow of the thickener is fed into flotation operation, flotation concentrate is obtained through first-stage roughing, first-stage concentration and third-stage scavenging operation, flotation tailings are discarded, gravity concentrate and flotation concentrate are combined into final concentrate, and the grade reaches over 67%. The traditional maghemite beneficiation process flow is shown in figure 1.
The traditional process flow of 'stage grinding, coarse and fine separation, gravity separation, strong magnetism and anion reverse flotation' of maghemite has the following problems: 1) In order to cope with the change, raw ores with the grade of 25% -30% are called normal ores and raw ores with the grade of 20% -25% are called extremely poor ores in the mineral separation production, the processing of the two raw ores needs to change mineral separation process parameters to try to keep the production normal, but the mineral separation technical index has larger fluctuation and unstable production; 2) The property of ore from a stope is greatly changed, the content of magnetic ore in raw ore is obviously increased, the ferrous iron in the raw ore is increased to 6.5-7.54% from 1-3.35% in the initial production period, and the content of the magnetic ore even reaches 80% in part of time periods, so that the process of adopting weak magnetism to separate ore concentrate is more suitable for the requirement of the change of the property of ore in the future; 3) The traditional sorting process has long and complex flow, is not easy to control and also causes unstable production technical indexes; 4) The practice that the spiral chute is adopted as the gravity separation equipment in the traditional separation process shows that the gravity separation concentrate has low yield (between 8% and 9%), the grade is low (between 66% and 66.5%), and the large circulation of middling causes mutual influence of all operations.
In order to solve a series of problems of large change of ore properties, frequent appearance of raw ore grade dilution, large fluctuation of production indexes of a dressing plant, long and complicated process flow of a dressing process and the like, dressing researchers have made a lot of exploration on a grinding and dressing process technology of magnetic red mixed ore. Two invention patents with patent numbers of CN201510320314.4 and CN201510320813.3 introduce a coarse grain preselection and magnetic-gravity separation process and a coarse grain preselection and magnetic-floatation separation process to separate micro-fine particle embedded mixed ores, which are characterized in that an operation system of 'semi-autogenous grinding, wet preselection, continuous ore grinding, weak magnetic-strong magnetic, fine screen regrinding and strong magnetic fine gravity separation' and an operation system of 'semi-autogenous grinding, wet preselection, continuous ore grinding, weak magnetic-strong magnetic, fine screen regrinding and strong magnetic fine reverse flotation' are adopted to separate the micro-fine particle embedded mixed ores. The two patents of the invention both adopt two-stage grinding-fine screen regrinding operation, and the outstanding problems in production are that the screen surface is easy to block and wear, so that the screening efficiency is low, the circulating load is large, the over-grinding phenomenon is serious, and the treatment capacity of a grinding machine and the sorting index are influenced. The invention patent with the patent number of CN201810729014.5 introduces a magnetite high-pressure roller milling-wet preselection-stage ore grinding-tower milling magnetic separation process, which is characterized in that a high-pressure roller mill-screening operation product is subjected to premagnetization operation, first-stage closed circuit ore grinding operation, second-stage closed circuit ore grinding operation and continuous three-stage magnetic separation operation, wherein the second-stage closed circuit ore grinding operation is formed by grading of a secondary cyclone and a second-stage tower mill, and final concentrate with the grade of over 67.5 percent and comprehensive tailings with the grade of 8.5 to 9.5 percent are obtained. The process belongs to a full magnetic process, is suitable for separating high-grade magnetite, but when the ore from a stope is low-grade maghemite, the invention patent only can separate the magnetic ore, can cause a large amount of loss of the maghemite, and is not beneficial to recycling lean iron ore resources.
Disclosure of Invention
The invention provides a separate grinding-magnetic levitation combined separation process for maghemite, aiming at solving the problems that the prior art is difficult to adapt to and coordinate normal ore and extremely poor ore treatment, and the problems of long process flow, complexity and difficult control of a separation process exist, and the aim is as follows: the method comprises the steps of firstly, processing the extremely poor ore by adding a semi-autogenous grinding-coarse grain pre-concentration process, adapting to the property change of the ore, realizing 'separate grinding' of the normal ore and the extremely poor ore, simultaneously carrying out coordinated processing or stable conversion processing on the normal ore and the extremely poor ore, and realizing ore blending of the raw ore in an ore dressing plant; and secondly, the spiral chute gravity separation operation is cancelled, a tower mill and a high-efficiency magnetic separator are adopted, the ore grinding magnetic separation is strengthened, the reverse flotation is reserved, the 'combined separation' of the ground products is realized, the flow is simplified, the separation effect and the iron ore resource utilization rate are improved, and the production cost is reduced.
The purpose of the invention is realized by the following technical scheme:
the invention discloses a separate grinding-magnetic suspension combined separation process of maghemite, which is characterized in that the maghemite mixed ore is divided into normal ore and extremely poor ore according to the raw ore grade of the ore from a stope, the normal ore grade is 25-30%, the granularity is 12-0mm, the extremely poor ore grade is 20-25%, and the granularity is 250-0mm, and then the two ores are fed into the separate grinding-magnetic suspension combined separation process of the invention for subsequent grinding and separation treatment, and the process specifically comprises the following steps:
step 1, feeding normal ore into a primary closed-circuit grinding grading operation to obtain a primary graded overflow product, feeding the primary graded overflow product into a primary weak-magnetism primary strong-magnetism operation, discarding tailings of a primary strong-magnetism tailing, combining a primary weak-magnetism concentrate and a primary strong-magnetism concentrate, and feeding the combined primary weak-magnetism concentrate and primary strong-magnetism concentrate into a secondary closed-circuit grinding grading operation to obtain a secondary graded overflow product;
step 2, feeding the extremely lean ores into a closed-circuit semi-autogenous grinding operation to obtain products under a linear sieve, feeding the products under the sieve into coarse grain weak magnetic coarse grain strong magnetic operation, discarding the tailings of the coarse grain strong magnetic tailings, and feeding the combined coarse grain weak magnetic concentrate and coarse grain strong magnetic concentrate into two sections of continuous grinding and grading operations to obtain two sections of graded overflow products;
step 3, merging the secondary grading overflow products and the secondary grading overflow products obtained in the step 1 and the step 2 into the selected ore;
step 4, feeding the combined feed ore into a second-stage weak magnetic operation for separation to obtain second-stage weak magnetic concentrate and second-stage weak magnetic tailings, feeding the second-stage weak magnetic tailings into a second-stage strong magnetic operation for separation to obtain second-stage strong magnetic concentrate and second-stage strong magnetic tailings, and discarding the second-stage strong magnetic tailings; feeding the second-stage weak magnetic concentrate into two continuous three-stage weak magnetic operation and four-stage weak magnetic operation for fine selection and sorting to obtain four-stage weak magnetic concentrate, three-stage weak magnetic tailings and four-stage weak magnetic tailings; and the second-section strong magnetic concentrate, the third-section weak magnetic tailings and the fourth-section weak magnetic tailings are combined and fed into a reverse flotation operation consisting of first-section roughing, first-section concentrating and third-section scavenging for separation to obtain reverse flotation concentrate and reverse flotation tailings, the reverse flotation tailings are discarded, the reverse flotation concentrate and the fourth-section weak magnetic concentrate are combined to form final concentrate, the final concentrate grade reaches over 67.5%, the final tailings consist of first-section strong magnetic tailings, coarse-grain strong magnetic tailings, second-section strong magnetic tailings and reverse flotation tailings, and the final tailings grade is below 9.5%.
The closed-circuit semi-autogenous grinding operation consists of a semi-autogenous grinding machine and a linear screen.
The ore grinding equipment adopted by the secondary closed circuit ore grinding grading operation is a tower mill.
The magnetic separator adopted by the three-section weak magnetic operation is a magnetic separation column.
Compared with the prior art, the invention has the advantages that:
1) The invention can adapt to the property change of the raw ore, and respectively grind normal ore (with the grade of 25-30%) and extremely poor ore (with the grade of 20-25%), thereby realizing coordinated ore blending in a dressing plant and ensuring the normal and stable production of the dressing process; the method realizes that the normal ore is treated by the main process to 800 ten thousand tons/year, the extremely poor ore is treated by the added 'semi-autogenous grinding-coarse grain pre-concentration' process system to 450 ten thousand tons/year, the capability of treating 1250 ten thousand tons/year of ore by a concentrating mill is met, the grade is expected to be increased by over 67 percent and over 100 ten thousand tons of iron ore concentrate, and the resource utilization rate of the iron ore is improved.
2) The invention cancels the spiral chute gravity separation operation, keeps the reverse flotation operation, adopts the tower mill and the high-efficiency magnetic separator, strengthens the ore milling magnetic separation operation, realizes the 'combined separation' of the separately milled products, is beneficial to simplifying the flow, improves the separation effect and reduces the production cost.
3) The invention is characterized in that the main process ball milling system and the semi-autogenous milling-pre-selection supplement system are relatively independent, which is convenient for production organization and operation management, the two ores are combined together when the separation operation is carried out, the separate milling and separation of normal maghemite and extremely poor maghemite are realized, and a new way is opened up for the high-efficiency separation of maghemite mixed ore.
Drawings
Fig. 1 is a flow chart of a traditional maghemite beneficiation process.
Fig. 2 is a flow chart of the beneficiation process of the present invention.
Detailed Description
The invention is further illustrated by the following figures and examples.
Examples
In the embodiment of the invention, normal ores are taken from a crushing workshop of a certain ore dressing plant in Anshan mountain, and the phase analysis result and the chemical multi-element analysis result of the normal ores are shown in tables 1 and 2; the extremely-poor ore is taken from a semi-autogenous grinding pre-selection workshop, and the phase analysis result and the chemical multi-element analysis result of the extremely-poor ore are shown in tables 3 and 4.
TABLE 1 analysis results of normal mineral phases
| Iron phase | TFe | FeCO 3 | FeSiO 3 | Fe 3 O 4 | Red and brown |
| Content (%) | 27.33 | 1.03 | 1.40 | 20.40 | 4.50 |
| Distribution ratio (%) | 100.00 | 3.77 | 5.12 | 74.64 | 16.47 |
TABLE 2 Multi-element analysis results of normal mine chemistry
| Name (R) | FeO | SiO 2 | CaO | MgO | Al 2 O 3 | MnO | S | P | Ig | TiO 2 |
| Content (%) | 9.80 | 48.34 | 4.03 | 3.61 | 0.03 | 0.121 | 0.022 | 0.024 | 1.72 | 0.006 |
TABLE 3 very lean mineral phase analysis results
| Iron phase | TFe | FeCO 3 | FeSiO 3 | Fe 3 O 4 | Red and brown |
| Content (%) | 22.85 | 0.50 | 1.85 | 4.20 | 16.30 |
| Distribution ratio (%) | 100.00 | 2.19 | 8.10 | 18.38 | 71.33 |
TABLE 4 chemical multielement analysis of very lean mineralizations
| Name (R) | FeO | SiO 2 | CaO | MgO | Al 2 O 3 | MnO | S | P | Ig | TiO 2 |
| Content (%) | 1.90 | 62.64 | 0.18 | 0.33 | 0.59 | 0.032 | 0.008 | 0.011 | 0.55 | 0.016 |
As shown in fig. 2, the separate grinding-magnetic levitation co-separation process of maghemite is characterized in that maghemite mixed ore is divided into normal ore and extremely poor ore according to the raw ore grade of the ore from a stope, the normal ore grade is 27.33%, the granularity is 12-0mm, the extremely poor ore grade is 22.85%, the granularity is 250-0mm, and then the two ores are fed into the separate grinding-magnetic levitation co-separation process of the invention for treatment, which specifically comprises the following steps:
step 1, feeding normal ore with the grade of 27.33% and the granularity of 12-0mm after crushing into primary closed-circuit grinding classification operation to obtain a primary classification overflow product, wherein the granularity of the primary classification overflow product reaches-200 meshes and accounts for 60%, feeding the primary classification overflow product into a section of weak magnetic section of strong magnetic operation, discarding the tail of a section of strong magnetic tailing, discarding a section of strong magnetic tailing with the yield of 21.34% and the grade of 5.93%, combining the section of weak magnetic concentrate and the section of strong magnetic concentrate into mixed magnetic concentrate, wherein the grade of the mixed magnetic concentrate is 38.03%, the yield is 42.66%, then feeding the mixed magnetic concentrate into secondary closed-circuit grinding classification operation, and obtaining a secondary classification overflow product by adopting a tower mill; the secondary grading overflow product has a granularity of-325 meshes accounting for 93 percent.
And 2, feeding the extremely lean ores with the grade of 22.85% and the granularity of 250-0mm into a closed-loop semi-autogenous grinding operation, wherein the closed-loop semi-autogenous grinding operation adopts a combination of a semi-autogenous grinding machine and a linear screen to obtain products under the linear screen, feeding the products under the screen into a coarse grain weak magnetic coarse grain strong magnetic operation, discarding the tailings of the coarse grain strong magnetic tailings, discarding the coarse grain tailings with the grade of 8.64% and the yield of 14.28%, merging the coarse grain weak magnetic concentrate and the coarse grain strong magnetic concentrate into coarse grain mixed magnetic concentrate with the grade of 32.19% and the yield of 21.72%, then feeding the coarse grain mixed magnetic concentrate into two-stage continuous grinding and grading operation to obtain two-stage graded overflow products, wherein the granularity of the two-stage graded overflow products reaches-325 meshes 95%.
And 3, combining the secondary graded overflow products and the secondary graded overflow products obtained in the steps 1 and 2 into the selected ore.
Step 4, subjecting the combined feed ore to secondary weak magnetic operation separation to obtain secondary weak magnetic concentrate and secondary weak magnetic tailings, wherein the grade of the secondary weak magnetic concentrate is 63.45%, the yield is 19.20%, the grade of the secondary weak magnetic tailings is 24.42%, and the yield is 45.18%; feeding the second-stage weak magnetic tailings into a second-stage strong magnetic operation for sorting to obtain second-stage strong magnetic concentrate and second-stage strong magnetic tailings, and discarding the second-stage strong magnetic tailings with the grade of 9.43% and the yield of 26.74%; the second-stage weak magnetic concentrate is fed into two continuous three-stage weak magnetic operation and four-stage weak magnetic operation for fine selection and sorting to obtain four-stage weak magnetic concentrate, three-stage weak magnetic tailings and four-stage weak magnetic tailings, wherein the grade of the four-stage weak magnetic concentrate is 68.41%, and the yield is 16.97%; the second-stage strong magnetic concentrate, the third-stage weak magnetic tailings and the fourth-stage weak magnetic tailings are combined to form reverse flotation feed ore, the reverse flotation feed ore grade is 43.96%, the yield is 20.67%, the reverse flotation feed ore is fed into a first-coarse, first-fine and third-sweep reverse flotation operation for separation, reverse flotation concentrate and reverse flotation tailings are obtained, reverse flotation tailings with the grade of 15.98% and the yield of 9.25% are discarded, the reverse flotation concentrate grade is 66.63%, and the yield is 11.42%; the reverse flotation concentrate and the four-section weak magnetic concentrate are combined into final concentrate, the grade of the final concentrate is 67.69%, the yield is 28.39%, the final tailings are formed by combining first-section strong magnetic tailings, coarse-grain strong magnetic tailings, second-section strong magnetic tailings and reverse flotation tailings, the grade of the final tailings is 9.08%, and the yield is 71.61%.
Claims (4)
1. The separate grinding-magnetic levitation combined separation process of the maghemite is characterized in that the maghemite mixed ore is divided into normal ore and extremely poor ore according to the raw ore grade of the ore from a stope, the normal ore grade is 25% -30%, the granularity is 12-0mm, the extremely poor ore grade is 20% -25%, the granularity is 250-0mm, and then the two ores are fed into the separate grinding-magnetic levitation combined separation process of the maghemite to carry out subsequent grinding and separation treatment, and the process specifically comprises the following steps:
step 1, feeding normal ore into primary closed-circuit grinding grading operation to obtain primary graded overflow products, feeding the primary graded overflow products into primary weak magnetic primary strong magnetic operation, discarding tailings of primary strong magnetic tailings, combining primary weak magnetic concentrate and primary strong magnetic concentrate, and feeding the combined primary weak magnetic concentrate and primary strong magnetic concentrate into secondary closed-circuit grinding grading operation to obtain secondary graded overflow products;
step 2, feeding the extremely lean ores into closed-circuit semi-autogenous grinding operation to obtain products under a linear sieve, feeding the products under the sieve into coarse grain weak magnetic coarse grain strong magnetic operation, discarding the tailings of the coarse grain strong magnetic tailings, and feeding the coarse grain weak magnetic concentrate and the coarse grain strong magnetic concentrate into two-section continuous grinding and grading operation after merging to obtain second-section graded overflow products;
step 3, merging the secondary grading overflow products and the secondary grading overflow products obtained in the step 1 and the step 2 into the selected ore;
step 4, feeding the combined feed ore into a second-stage weak magnetic operation for separation to obtain second-stage weak magnetic concentrate and second-stage weak magnetic tailings, feeding the second-stage weak magnetic tailings into a second-stage strong magnetic operation for separation to obtain second-stage strong magnetic concentrate and second-stage strong magnetic tailings, and discarding the second-stage strong magnetic tailings; feeding the second-stage weak magnetic concentrate into two continuous three-stage weak magnetic operation and four-stage weak magnetic operation for fine selection and sorting to obtain four-stage weak magnetic concentrate, three-stage weak magnetic tailings and four-stage weak magnetic tailings; the second-stage strong magnetic concentrate, the third-stage weak magnetic tailings and the fourth-stage weak magnetic tailings are merged and fed into a reverse flotation operation consisting of first-stage roughing, first-stage concentrating and third-stage scavenging for separation to obtain reverse flotation concentrate and reverse flotation tailings, the reverse flotation tailings are thrown, the reverse flotation concentrate and the fourth-stage weak magnetic concentrate are merged into final concentrate, the grade of the final concentrate reaches over 67.5%, the final tailings are composed of first-stage strong magnetic tailings, coarse-grain strong magnetic tailings, second-stage strong magnetic tailings and reverse flotation tailings, and the grade of the final tailings is below 9.5%.
2. The separate grinding-magnetic flotation process for maghemite according to claim 1, wherein the closed semi-autogenous grinding operation comprises a semi-autogenous grinding mill and a linear screen.
3. The separate grinding-magnetic levitation separation process for maghemite according to claim 1, wherein the grinding equipment used in the secondary closed circuit grinding classification operation is a tower mill.
4. The separate grinding-magnetic levitation separation process of maghemite according to claim 1, wherein the magnetic separator adopted in the three-stage weak magnetic operation is a magnetic separation column.
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| CN104923386A (en) * | 2015-06-12 | 2015-09-23 | 鞍钢集团矿业公司 | Micro-fine disseminated mixed ore coarse size preconcentrating and magnetic-gravitational separating process |
| CN108672082A (en) * | 2018-07-05 | 2018-10-19 | 鞍钢集团矿业有限公司 | Magnetic iron ore high pressure roller mill-wet type pre-selecting-stage grinding-tower grinds magnetic separation process |
| CN108970802A (en) * | 2018-09-20 | 2018-12-11 | 鞍钢集团矿业有限公司 | A kind of floating combined mineral dressing technology of the stage grinding-magnetic-weight-sorting hematite |
| CN109201322A (en) * | 2018-09-20 | 2019-01-15 | 鞍钢集团矿业有限公司 | A kind of sorting process of the hematite containing ferric carbonate |
| CN109351467A (en) * | 2018-09-20 | 2019-02-19 | 鞍钢集团矿业有限公司 | A kind of sorting process based on the iron mineral disseminated grain size processing red mixed ore of magnetic |
| CN109675712A (en) * | 2019-01-08 | 2019-04-26 | 中冶北方（大连）工程技术有限公司 | A kind of processing high-sulfur is red-ore-dressing technique of magnetic compound iron ore |
| CN110898958A (en) * | 2019-11-13 | 2020-03-24 | 鞍钢集团矿业有限公司 | Mineral processing technology for treating high-iron carbonate lean magnetic hematite mixed iron ore |
| WO2022052718A1 (en) * | 2020-09-09 | 2022-03-17 | 中钢集团马鞍山矿山研究总院股份有限公司 | Beneficiation method for preparing ultrapure iron ore concentrate from magnetite concentrates |
| 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 |
| CN115445759A (en) * | 2022-09-13 | 2022-12-09 | 鞍钢集团矿业设计研究院有限公司 | Combined process of grinding, selecting and gravity-magnetic separation of magnetic hematite mixed ore |
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