CN115463741A - Sub-grinding, in-situ separation, suspension roasting and magnetic separation process for magnetic hematite mixed ore - Google Patents
Sub-grinding, in-situ separation, suspension roasting and magnetic separation process for magnetic hematite mixed ore Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 54
- 238000000227 grinding Methods 0.000 title claims abstract description 49
- 238000000926 separation method Methods 0.000 title claims abstract description 34
- 239000000725 suspension Substances 0.000 title claims abstract description 16
- 238000007885 magnetic separation Methods 0.000 title claims description 21
- 229910052595 hematite Inorganic materials 0.000 title abstract description 7
- 239000011019 hematite Substances 0.000 title abstract description 7
- LIKBJVNGSGBSGK-UHFFFAOYSA-N iron(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Fe+3].[Fe+3] LIKBJVNGSGBSGK-UHFFFAOYSA-N 0.000 title description 4
- 238000011065 in-situ storage Methods 0.000 title 1
- 239000012141 concentrate Substances 0.000 claims abstract description 61
- 239000006148 magnetic separator Substances 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 14
- 238000005188 flotation Methods 0.000 abstract description 11
- 230000005484 gravity Effects 0.000 abstract description 11
- 238000002156 mixing Methods 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 4
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 230000000087 stabilizing effect Effects 0.000 abstract description 2
- 239000000047 product Substances 0.000 description 22
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 14
- 238000004458 analytical method Methods 0.000 description 8
- 230000005389 magnetism Effects 0.000 description 7
- 229910052742 iron Inorganic materials 0.000 description 6
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 6
- 229910052500 inorganic mineral Inorganic materials 0.000 description 5
- 239000011707 mineral Substances 0.000 description 5
- 230000002000 scavenging effect Effects 0.000 description 3
- 238000012216 screening Methods 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
- 238000010790 dilution Methods 0.000 description 2
- 239000012895 dilution Substances 0.000 description 2
- 238000005516 engineering process Methods 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
- 238000012827 research and development Methods 0.000 description 2
- 239000000126 substance 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
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000005285 magnetism related processes and functions Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
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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
- B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- B03B7/00—Combinations of wet processes or apparatus with other processes or apparatus, e.g. for dressing ores or garbage
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- B03B9/00—General arrangement of separating plant, e.g. flow sheets
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/02—Roasting processes
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Abstract
The invention relates to a process of grinding and separating, suspending roasting and magnetic separating of magnetic-hematite mixed ore, 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 of the invention for treatment, 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: and (3) merging the separately ground products and feeding the merged products into a two-stage weak-magnetic strong-magnetic tailing discarding, suspension roasting and continuous weak-magnetic process to obtain the final concentrate with the grade of more than 67%. The invention has the advantages that: 1) Can adapt to the change of the properties of the raw ore, realize the coordination and ore blending in the ore dressing plant and is beneficial to the stable production; 2) The gravity separation and flotation processes are eliminated, the suspension roasting is added, the full-magnetic process is adopted, the flow is simplified, and the effects of reducing the cost and stabilizing the production are achieved.
Description
Technical Field
The invention belongs to the technical field of iron ore dressing processes, and particularly relates to a process of separating, grinding, separating, suspending, roasting and magnetically separating magnetic-hematite mixed ore.
Background
The existing main separation process for processing the Anshan-type maghemite adopts the process flows of stage grinding, coarse and fine separation, gravity separation, strong magnetism and anion reverse flotation, the raw ore is crushed to the granularity of 12-0mm by a coarse crushing, medium crushing and fine crushing screening system, the crushed raw ore is fed into a primary closed circuit grinding system consisting of an overflow type ball mill and a cyclone group, a primary overflow is fed into an involute type cyclone group to be classified into two kinds of coarse and fine materials, the coarse and fine classification cyclone sand is fed into a three-section spiral chute for coarse separation, fine separation and scavenging to obtain gravity concentrate, the swept spiral tailings are fed with permanent magnetism and swept medium magnetism to obtain gravity tailings, the refined spiral tailings, the swept spiral concentrate, the permanent magnetic concentrate and the swept medium magnetic concentrate are fed into a secondary grinding-classification system together, and the overflow returns to the coarse and fine classification operation again. Overflow of the coarse and fine grading cyclone is fed into permanent magnet operation, permanent magnet tailings are fed into a thickener for concentration, the bottom flow of the permanent magnet tailings passes through a section of deslagging screen and is fed into a strong magnet machine, and the strong magnet tailings are discarded; 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 a flotation operation compressor, the underflow is fed into flotation operation, flotation concentrate is obtained through first-stage roughing, first-stage concentrating and three-stage scavenging operation, flotation tailings are discarded, the scavenging and the concentrating tailings return to the roughing operation, 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.
Production practices show that the traditional process flow of 'stage grinding, coarse and fine separation, gravity separation, strong magnetism and anion reverse flotation' of the maghemite has the following problems: firstly, in recent years, the properties of ore ores in stopes are changed greatly, the stopes cannot strictly carry out an ore blending system, the grade fluctuation of raw ores is large, the production of ore dressing plants is passive, in order to cope with the change, the raw ores with the grade of 25% -30% are called normal ores, the raw ores with the grade of 20% -25% are called extremely poor ores in ore dressing production, the normal production is kept by changing the ore dressing process parameters, but the indexes of the two raw ore concentrates processed by the traditional process flow are large in fluctuation, and the production is often unstable; in addition, in addition to the phenomenon of dilution of the grade of the raw ore, the content of the magnetic ore of the raw ore is obviously increased, the ferrous iron of the raw ore is increased to 6.5-7.54% from 1-3.35% at the initial stage of operation, and the content of the magnetic ore even reaches 80% in a part of time intervals, so the process of selecting the concentrate by weak magnetism is more suitable for the requirement of the change of the property of the ore in the future; secondly, the traditional sorting process comprises three main processes of gravity, magnetism and floatation, has long and complex flow path, is not easy to control and also causes unstable production technical indexes; thirdly, the yield of gravity concentrate is low (between 8% and 9%), the grade is low (between 66% and 66.5%), and the large circulation of middlings causes the mutual influence of the operations.
In order to solve a series of problems of large change of ore properties, frequent occurrence of raw ore grade dilution, unsatisfactory ore blending effect of a stope, large fluctuation of production indexes of an ore dressing plant, long and complicated process flow of a mineral dressing process and the like, a mineral dressing research worker conducts a great deal of exploration on a process technology of sub-grinding and selecting-suspension roasting-magnetic separation of magnetic-red mixed ore, a series of technical progress is made in aspects of a sorting technology, research and development of novel mineral dressing equipment, research and development of a suspension roasting process and the like, and high-efficiency and energy-saving grinding and selecting equipment such as a vertical stirring mill, a high-efficiency magnetic separator and the like are successively applied to various large mines, so that great progress is made.
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 cyclic load is large, the over-grinding phenomenon is serious, and the treatment capacity of a mill and the selection 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 aims to provide a process for separating, grinding, combining, roasting, and magnetically separating magnetic-hematite mixed ore, aiming at the problems that the prior art is difficult to adapt to and coordinate normal ore and extremely-lean ore treatment, and has the problems of long process flow of ore separation process, complexity and difficult control.
The purpose of the invention is realized by the following technical scheme:
the invention relates to a separate grinding-in-separation-suspension roasting-magnetic separation process of magnetic red mixed ore, which is characterized in that the magnetic red 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-in-separation-suspension roasting-magnetic separation process of the invention to be subjected to subsequent grinding-in-separation treatment operation 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 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;
and 4, feeding the combined feed ore into a second-stage weak magnetic operation separation to obtain a second-stage weak magnetic concentrate and a second-stage weak magnetic tailing, feeding the second-stage weak magnetic tailing into a second-stage strong magnetic operation separation, discarding the tail of the second-stage strong magnetic tailing, feeding the second-stage strong magnetic concentrate into a suspension roasting operation, feeding the roasted product into the third-stage weak magnetic operation separation, discarding the tail of the third-stage weak magnetic tailing, combining the third-stage weak magnetic concentrate with the second-stage weak magnetic concentrate, feeding two continuous four-stage weak magnetic separation and five-stage weak magnetic separation, discarding the four-stage weak magnetic tailing and five-stage weak magnetic tailing, wherein the five-stage weak magnetic concentrate is a final concentrate, the final concentrate has a grade of over 67 percent, and the final tailing is formed by combining the first-stage strong magnetic tailing, the coarse-grain strong magnetic tailing, the second-stage strong magnetic tailing, the third-stage weak magnetic tailing, the four-stage weak magnetic tailing and the five-stage weak magnetic tailing, and has a final grade of below 9.5 percent.
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 four sections of weak magnetism is an elutriation machine.
Compared with the prior art, the invention has the advantages that:
1) The invention can adapt to the property change of the raw ore, realizes the coordinated ore blending of normal ore (with the grade of 25-30%) and extremely-lean ore (with the grade of 20-25%) in the ore dressing plant, and ensures the normal and stable production of the ore dressing process; the method has the advantages that the normal ore can be treated by the main process to 800 ten thousand tons per year, the extremely poor ore can be treated by the added 'semi-autogenous grinding-coarse grain pre-concentration' process system to 450 ten thousand tons per year, the capacity of treating 1250 ten thousand tons per year of ore by a concentrating mill is met, the grade of iron ore concentrate with the grade of more than 67 percent is expected to be increased by more than 100 ten thousand tons, and the resource utilization rate of the iron ore is improved;
2) The gravity separation process and the flotation process are eliminated, the suspension roasting process is added, the high-efficiency magnetic separator is adopted, the full-magnetic process flow is simplified and optimized, and the effects of reducing the cost and stabilizing the production are achieved;
3) The invention is characterized in that the main process ball milling system and the semi-autogenous milling-preselection supplement system are relatively independent, which is convenient for production organization and operation management, when the separation operation is carried out, the two ores are combined together, thereby achieving the effect of' separation, grinding and separation, realizing the full magnetic separation of normal ore and extremely poor ore of the magnetic red mixed ore, and opening up a new way for the high-efficiency separation of the magnetic red 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 results and chemical multi-element analysis results of the normal ores are shown in tables 1 and 2; the extremely lean ore was taken from a semi-autogenous grinding pre-selection plant, and the results of the phase analysis and the chemical multi-element analysis of the extremely lean ore are shown in tables 3 and 4.
TABLE 1 analysis 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 Multi-element analysis results of very poor mineralogy
| Name(s) | 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 milling-separation-suspension roasting-magnetic separation process of the magnetic hematite mixed ore of the present invention is characterized in that the magnetic hematite 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 milling-separation-suspension roasting-magnetic separation process of the present invention for subsequent milling-separation treatment operation 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 grading operation to obtain a primary graded overflow product, wherein the granularity of the primary graded overflow product reaches-200 meshes and accounts for 60%, feeding the primary graded overflow product into a section of weak-magnetic section of strong-magnetic operation, discarding the tail of a section of strong-magnetic tailings, discarding a section of strong-magnetic tailings 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 with the grade of 38.03% and the yield of 42.66%, then feeding the mixed-magnetic concentrate into secondary closed-circuit grinding grading operation, and obtaining a secondary graded 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 grading overflow products and the secondary grading overflow products obtained in the steps 1 and 2 into the selected ore.
Step 4, subjecting the selected feed ore to second-stage weak magnetic operation separation to obtain second-stage weak magnetic concentrate and second-stage weak magnetic tailings, obtaining second-stage weak magnetic concentrate with the grade of 63.45% and the yield of 22.43%, subjecting the second-stage weak magnetic tailings with the grade of 21.42% and the yield of 41.95% to second-stage strong magnetic separation, discarding second-stage strong magnetic tailings with the grade of 8.93% and the yield of 24.46%, subjecting the strong magnetic concentrate with the grade of 38.89% and the yield of 17.49% to suspension roasting treatment, subjecting roasted products to third-stage weak magnetic separation operation separation, discarding third-stage weak magnetic tailings with the yield of 6.55% and the grade of 8.05%, and obtaining third-stage weak magnetic concentrate with the yield of 10.94% and the grade of 57.36%; mixing the third-stage weak magnetic concentrate and the second-stage weak magnetic concentrate, feeding the mixture into four-stage weak magnetic operation for separation, discarding four-stage weak magnetic tailings with the grade of 21.92% and the yield of 3.12%, feeding four-stage weak magnetic concentrate with the grade of 65.53% and the yield of 30.25% into five-stage weak magnetic operation for separation, discarding five-stage weak magnetic tailings with the grade of 24.24% and the yield of 1.14%, obtaining five-stage magnetic separation concentrate, wherein the five-stage weak magnetic concentrate is final concentrate, the final concentrate grade is 67.14%, and the yield is 29.11%; the first-stage strong magnetic tailings, the coarse-grain strong magnetic tailings, the second-stage strong magnetic tailings, the third-stage weak magnetic tailings, the fourth-stage weak magnetic tailings and the fifth-stage weak magnetic tailings are combined into final tailings, the grade of the final tailings is 8.71%, and the yield is 70.89%.
The method treats the extremely poor ores by adding a semi-autogenous grinding-coarse grain pre-concentration process, realizes 'separate grinding' of normal ores and the extremely poor ores, simultaneously processes the normal ores and the extremely poor ores in a coordinated way or in a stable way, and realizes ore blending of raw ores in an ore dressing plant; in addition, gravity separation operation and flotation operation are eliminated, a suspension roasting process and a high-efficiency magnetic separator are adopted, the optimized magnetic separation process is simplified, the combined separation of normal ores and extremely poor ores is realized, and the full magnetic separation process is favorable for reducing the production cost and improving the separation efficiency.
Claims (4)
1. A separate grinding-in-separation-suspension roasting-magnetic separation process of magnetic red mixed ore is characterized in that the magnetic red 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-in-separation-suspension roasting-magnetic separation process of the invention for subsequent grinding and separation treatment operation 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;
and 4, feeding the combined feed ore into a second-stage weak magnetic operation separation to obtain a second-stage weak magnetic concentrate and a second-stage weak magnetic tailing, feeding the second-stage weak magnetic tailing into a second-stage strong magnetic operation separation, discarding the tail of the second-stage strong magnetic tailing, feeding the second-stage strong magnetic concentrate into a suspension roasting operation, feeding the roasted product into the third-stage weak magnetic operation separation, discarding the tail of the third-stage weak magnetic tailing, combining the third-stage weak magnetic concentrate with the second-stage weak magnetic concentrate, feeding two continuous four-stage weak magnetic separation and five-stage weak magnetic separation, discarding the four-stage weak magnetic tailing and five-stage weak magnetic tailing, wherein the five-stage weak magnetic concentrate is a final concentrate, the final concentrate has a grade of over 67 percent, and the final tailing is formed by combining the first-stage strong magnetic tailing, the coarse-grain strong magnetic tailing, the second-stage strong magnetic tailing, the third-stage weak magnetic tailing, the four-stage weak magnetic tailing and the five-stage weak magnetic tailing, and has a final grade of below 9.5 percent.
2. The process of claim 1, wherein the closed semi-autogenous grinding operation comprises a semi-autogenous grinding machine and a linear sieve.
3. The process of claim 1, wherein the ore grinding equipment used in the secondary closed circuit grinding classification operation is a tower mill.
4. The process of claim 1, wherein the four-stage magnetic separator for weak magnetic separation is an elutriator.
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