CN114308370B - Process for grinding, magnetically separating, upgrading and sand making mixed iron ore - Google Patents
Process for grinding, magnetically separating, upgrading and sand making mixed iron ore Download PDFInfo
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- CN114308370B CN114308370B CN202011033483.7A CN202011033483A CN114308370B CN 114308370 B CN114308370 B CN 114308370B CN 202011033483 A CN202011033483 A CN 202011033483A CN 114308370 B CN114308370 B CN 114308370B
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Abstract
The invention relates to a magnetic separation quality improvement sand making process for mixed iron ore grinding, which comprises the following steps: first-stage grinding, magnetic separation, second-stage grinding, screening and sorting, iron tailing production and the like. According to the magnetic separation quality improvement sand making process for the mixed iron ore grinding, provided by the invention, the magnetic separation quality improvement sand making process technology and method are adopted for the difficult-to-separate mixed iron ore containing magnetite, hematite, siderite and the like in the ore grinding stage, coarse-grain tailings, gangue and other impurities in the ore grinding are thrown to be wasted in advance, so that the iron concentrate production efficiency of two-stage ore grinding and the following working procedures is improved, the production cost of power consumption, spare part material consumption and the like in the ore dressing and grinding stage is reduced, and the production efficiency is improved. The tailings subjected to magnetic separation and waste disposal are processed into machine-made sand and cement correction agents in a grading way, so that the complete recycling comprehensive utilization of the tailings is realized, and the aim of zero emission of mine tailings is fulfilled. Meets the national environment-friendly requirement, supports the national economic construction development and creates good economic benefit for mine enterprises.
Description
Technical Field
The invention relates to a magnetic separation quality improvement sand making process for mixed iron ore grinding, and belongs to the technical field of environmental protection.
Background
In recent years, the iron and steel industry in China rapidly develops, the iron ore concentrate is increasingly demanded by domestic iron and steel enterprises, and compared with foreign iron ores, the iron ore resources in China have the characteristics of less rich ore, more lean ore, fine embedding granularity, compact symbiosis with gangue minerals and high separation difficulty. The traditional mine production process has large discharge amount of fine-fraction wet tailings, and the treatment of the fine-fraction wet tailings becomes a bottleneck for restricting sustainable survival development of mines. The low-grade tailings and gangue minerals generated in mine production are thrown away, so that mine resources are wasted.
Disclosure of Invention
The invention aims to solve the technical problems that: the technology and the method for grinding, magnetically separating, upgrading and sand making mixed iron ores comprise the steps of grinding magnetite, hematite, siderite and the like, then adopting an internal rotation type magnetic separator to separate the difficult-to-separate mixed iron ores containing the magnetite, the hematite, the siderite and the like, realizing wide-grain-level separation, optimizing an external magnetic system structure of the magnetic separator, separating the magnetite, the hematite and the siderite, pre-separating low-grade coarse-grain-level tailings in advance, processing the low-grade fine-grain-level tailings into machine-made sand, and processing the low-grade coarse-grain-level tailings into cement correction agents. The waste is thrown through magnetic separation pre-selection after the primary grinding, so that the production load of the secondary grinding is reduced, the production operation efficiency of the subsequent working procedure is improved, the grinding power consumption is reduced, and the fine fraction wet tail quantity is greatly reduced.
In order to solve the technical problems, the technical scheme provided by the invention is as follows: a process for grinding mixed iron ore, magnetically separating, upgrading and producing sand comprises the following steps:
step 1: grinding the first section; the grain size of the mixed iron ore is less than or equal to 12mm, the iron grade is 43-46%, the mixed iron ore is put into a first-stage ball mill for ore grinding, the ore grinding concentration is 80-85%, the ore discharge granularity is less than 3mm and accounts for 98%, the ore discharge granularity is less than 0.074mm and accounts for 30%, and the ore discharge concentration is 80-83%;
step 2: magnetic separation; feeding the ore discharged from the first-stage ball mill into an ore feeding box of an internal rotation type magnetic separator, and adding water to control the ore feeding concentration of the internal rotation type magnetic separator to be 20-50%; the installation angle of the internal rotation type magnetic separator is 6-8 degrees; the magnetic field intensity of the inner barrel of the weak magnetic section of the internal rotation magnetic separator is 3000-4000 Oe, and the magnetic field intensity of the inner barrel of the strong magnetic section is 6500-7000Oe; the tailing grade of the internal rotation type magnetic separator is less than 22%, wherein the coarse fraction iron-containing grade of more than 0.2mm is less than 20%; concentrate yield of the internal rotation type magnetic separator is more than 78%;
step 3: two-stage grinding; the magnetic concentrate is adsorbed on a cylinder of the internal rotation type magnetic separator under the action of a magnetic field, and is rinsed above a concentrate chute by rinsing water along with the rotation of the cylinder, and is rinsed to the concentrate chute by rinsing water in a magnetic system separation area, and the magnetic concentrate automatically flows into a second-stage ball mill; feeding the secondary ball milling ore discharge into a cyclone group through a slurry pump, wherein the size of a sand setting nozzle of the cyclone group is 90mm, feeding ore pulp underflow after classification of the cyclone group into the secondary ball milling 3, and feeding overflow of the cyclone group into post-flotation process sorting operation;
step 4: screening and sorting; the magnetic tailings of the internal rotation type magnetic separator automatically flow into a high-frequency sieve to perform screening and sorting operation, the mesh size of the screen mesh of the high-frequency sieve is 0.5-1 mm, a variable cone hydrocyclone set is fed under the screen mesh of the high-frequency sieve, the sand setting mouth size of the variable cone hydrocyclone set is 2-3 mm, the underflow of the variable cone hydrocyclone set is fed into a negative inclination high-frequency fine sieve to perform screening operation, the mesh size of the screen mesh of the negative inclination high-frequency fine sieve is 0.15-0.3 mm, and the product on the screen mesh of the negative inclination high-frequency fine sieve and the product on the screen mesh of the high-frequency sieve are mixed and processed into machine-made sand serving as building material products, and the machine-made sand is piled in a machine-made sand silo;
step 5: producing iron tailings; and (3) feeding overflow of the variable cone hydrocyclone set into a ceramic filter for filtering and dewatering, and processing and producing iron tailings, wherein the iron-containing grade of the iron tailings is 18-21%, and the iron tailings are used as iron medium correction agent products of cement factories.
According to the magnetic separation quality improvement sand making process for the mixed iron ore grinding, provided by the invention, the magnetic separation quality improvement sand making process technology and method are adopted for the difficult-to-separate mixed iron ore containing magnetite, hematite, siderite and the like in the ore grinding stage, coarse-grain tailings, gangue and other impurities in the ore grinding are thrown to be wasted in advance, so that the iron concentrate production efficiency of two-stage ore grinding and the following working procedures is improved, the production cost of power consumption, spare part material consumption and the like in the ore dressing and grinding stage is reduced, and the production efficiency is improved. The tailings subjected to magnetic separation and waste disposal are processed into machine-made sand and cement correction agents in a grading way, so that the complete recycling comprehensive utilization of the tailings is realized, and the aim of zero emission of mine tailings is fulfilled. Meets the national environment-friendly requirement, supports the national economic construction development and creates good economic benefit for mine enterprises.
Drawings
Fig. 1 is a schematic structural view of a preferred embodiment of the present invention.
Detailed Description
Examples
The magnetic separation, upgrading and sand making process for the mixed iron ore grinding mainly uses equipment shown in fig. 1, and comprises a first-stage ball mill 1, an internal rotation magnetic separator 2, a second-stage ball mill 3, a cyclone group 4, a large-inclination high-frequency screen 5, an ultra-long variable-cone hydrocyclone group 6, a negative-inclination high-frequency fine screen 7 and a ceramic filter 8.
The method comprises the following steps:
step 1: grinding the first section; the particle size of the mixed iron ore is less than or equal to 12mm, the iron grade is 43-46%, the mixed iron ore is put into a first-stage ball mill 1 for ore grinding, the ore grinding concentration is 80-85%, the ore discharge granularity is less than 98% and less than 0.074mm and accounts for 30%, the gangue minerals and iron mineral monomers embedded by partial coarse particles are dissociated, and the ore discharge concentration is 80-83%;
step 2: magnetic separation; feeding ore discharged from the first-stage ball mill 1 into an ore feeding box of the internal rotation type magnetic separator 2, and adding water to control the ore feeding concentration of the internal rotation type magnetic separator 2 to be 20-50%; the feeding uniformity of the internal rotation type magnetic separator 2 is ensured, and the production sorting effect of the internal rotation type magnetic separator 2 is improved; the installation angle of the internal rotation type magnetic separator is 6-8 degrees, so that the self-flowing of ore pulp in the internal rotation type magnetic separator 2 can be met, and the pre-dressing waste discarding of low-grade ore and impurity gangue can be realized under the combined action of gravity, magnetic force and flushing water; the magnetic field intensity of the inner cylinder surface of the weak magnetic section of the internal rotation magnetic separator 2 is 3000-4000 Oe, and the magnetic field intensity of the inner cylinder surface of the strong magnetic section is 6500-7000Oe, so that the effective recovery of magnetite strong magnetic mineral, hematite and siderite weak magnetic mineral can be realized; after magnetic separation, part of low-grade coarse fraction tailings are thrown out in advance, and the magnetic concentrate grade of the internal rotation magnetic separator 2 is improved by 5-7 percent compared with the iron grade of the ore grinding; the tailing grade of the internal rotation type magnetic separator is less than 22%, wherein the coarse fraction iron-containing grade of more than 0.2mm is less than 20%; concentrate yield of the internal rotation type magnetic separator is more than 78%;
step 3: two-stage grinding; the magnetic concentrate is adsorbed on a cylinder of an internal rotation type magnetic separator 2 under the action of a magnetic field, and is rinsed by rinsing water along with the rotation of the cylinder, and is rinsed to a concentrate chute above the concentrate chute and separated from a magnetic system area by rinsing water, and the magnetic concentrate automatically flows into a second-stage ball mill 3; feeding the second-stage ball-milling ore discharge into a phi 500 cyclone group 4 through a slurry pump, wherein the size of a sand setting nozzle of the cyclone group 4 is 90mm, feeding ore pulp underflow after classification of the cyclone group 4 into a second-stage ball mill 3, and feeding overflow of the cyclone group 4 into a post-flotation process sorting operation; the production processing capacity of the second-stage ore grinding can be improved by 22% by adding an internal rotation type magnetic separator for magnetic separation after the first-stage ore grinding, the power consumption of ore dressing and ore grinding stages and the like can be reduced, and the ore grinding production efficiency can be improved;
step 4: screening and sorting; the magnetic tailings of the internal rotation type magnetic separator 2 automatically flow into a large-inclination-angle high-frequency sieve 5 for screening and sorting operation, the mesh size of the screen mesh of the large-inclination-angle high-frequency sieve 5 is 0.5-1 mm, a phi 250 ultra-long variable cone hydrocyclone group 6 is fed under the screen mesh of the large-inclination-angle high-frequency sieve 5, the size of a sand setting nozzle of the ultra-long variable cone hydrocyclone group 6 is 2-3 mm, the underflow of the ultra-long variable cone hydrocyclone group 6 is fed into a negative-inclination-angle high-frequency fine sieve 7 for screening operation, the mesh size of the screen mesh of the negative-inclination-angle high-frequency fine sieve 7 is 0.15-0.3 mm, and a product on the screen mesh of the negative-inclination-angle high-frequency fine sieve 7 and a product on the screen mesh of the large-inclination-angle high-frequency sieve 5 are mixed and processed into machine-made sand serving as building material products, and the machine-made sand is piled in a machine-made sand silo;
step 5: producing iron tailings; the overflow of the ultra-long variable cone hydrocyclone unit 6 is fed into a ceramic filter 8 for filtering and dewatering, and the iron tailings are processed and produced into iron tailings, wherein the iron-containing grade of the iron tailings is 18-21%, and the iron tailings are used as an iron medium corrector product of a cement plant.
The present invention is not limited to the above-described embodiments. All technical schemes formed by adopting equivalent substitution fall within the protection scope of the invention.
Claims (1)
1. The magnetic separation quality improvement sand making process for the mixed iron ore grinding is characterized by comprising the following steps of:
step 1: grinding the first section; the grain size of the mixed iron ore is less than or equal to 12mm, the iron grade is 43-46%, the mixed iron ore is put into a first-stage ball mill for ore grinding, the ore grinding concentration is 80-85%, the ore discharge granularity is less than 3mm and accounts for 98%, the ore discharge granularity is less than 0.074mm and accounts for 30%, and the ore discharge concentration is 80-83%;
step 2: magnetic separation; feeding the ore discharged from the first-stage ball mill into an ore feeding box of an internal rotation type magnetic separator, and adding water to control the ore feeding concentration of the internal rotation type magnetic separator to be 20-50%; the installation angle of the internal rotation type magnetic separator is 6-8 degrees; the magnetic field intensity of the inner barrel of the weak magnetic section of the internal rotation magnetic separator is 3000-4000 Oe, and the magnetic field intensity of the inner barrel of the strong magnetic section is 6500-7000Oe; the tailing grade of the internal rotation type magnetic separator is less than 22%, wherein the coarse fraction iron-containing grade of more than 0.2mm is less than 20%; concentrate yield of the internal rotation type magnetic separator is more than 78%;
step 3: two-stage grinding; the magnetic concentrate is adsorbed on a cylinder of the internal rotation type magnetic separator under the action of a magnetic field, and is rinsed above a concentrate chute by rinsing water along with the rotation of the cylinder, and is rinsed to the concentrate chute by rinsing water in a magnetic system separation area, and the magnetic concentrate automatically flows into a second-stage ball mill; feeding the secondary ball-milling ore discharge into a cyclone group through a slurry pump, wherein the size of a sand setting nozzle of the cyclone group is 90mm, feeding ore pulp underflow after classification of the cyclone group into the secondary ball-milling, and feeding overflow of the cyclone group into post-flotation process sorting operation;
step 4: screening and sorting; the magnetic tailings of the internal rotation type magnetic separator automatically flow into a high-frequency sieve to perform screening and sorting operation, the mesh size of the screen mesh of the high-frequency sieve is 0.5-1 mm, a variable cone hydrocyclone set is fed under the screen mesh of the high-frequency sieve, the sand setting mouth size of the variable cone hydrocyclone set is 2-3 mm, the underflow of the variable cone hydrocyclone set is fed into a negative inclination high-frequency fine sieve to perform screening operation, the mesh size of the screen mesh of the negative inclination high-frequency fine sieve is 0.15-0.3 mm, and the product on the screen mesh of the negative inclination high-frequency fine sieve and the product on the screen mesh of the high-frequency sieve are mixed and processed into machine-made sand serving as building material products, and the machine-made sand is piled in a machine-made sand silo;
step 5: producing iron tailings; and the overflow of the cone-changing hydrocyclone set is fed into a ceramic filter for filtering and dewatering, and the iron tailings are processed and produced into iron tailings, wherein the iron-containing grade of the iron tailings is 18-21%, and the iron tailings are used as an iron medium correction agent product of a cement plant.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1562024A1 (en) * | 1988-03-03 | 1990-05-07 | Белгородский филиал Научно-исследовательского и проектного института по обогащению и агломерации руд черных металлов "Механобрчермет" | Method of dressing magnetite ores |
| CN103586146A (en) * | 2013-11-13 | 2014-02-19 | 鞍钢集团矿业公司 | Mineral processing process for processing mixed ore of magnetic iron ore and hematite-limonite ore |
| CN104190522A (en) * | 2014-08-07 | 2014-12-10 | 安徽金日盛矿业有限责任公司 | Magnetic ore rescreening process for mixed iron ore |
| CN104722393A (en) * | 2015-03-19 | 2015-06-24 | 长沙矿冶研究院有限责任公司 | Beneficiation method for improving fine grain specularite recovery |
| CN106311438A (en) * | 2016-08-19 | 2017-01-11 | 鞍钢集团矿业有限公司 | Low-grade Anshan magnetite beneficiation process |
| CN110498624A (en) * | 2018-05-17 | 2019-11-26 | 南京梅山冶金发展有限公司 | The method that iron tailings wholegrain grade prepares cement irony correction material |
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2020
- 2020-09-27 CN CN202011033483.7A patent/CN114308370B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1562024A1 (en) * | 1988-03-03 | 1990-05-07 | Белгородский филиал Научно-исследовательского и проектного института по обогащению и агломерации руд черных металлов "Механобрчермет" | Method of dressing magnetite ores |
| CN103586146A (en) * | 2013-11-13 | 2014-02-19 | 鞍钢集团矿业公司 | Mineral processing process for processing mixed ore of magnetic iron ore and hematite-limonite ore |
| CN104190522A (en) * | 2014-08-07 | 2014-12-10 | 安徽金日盛矿业有限责任公司 | Magnetic ore rescreening process for mixed iron ore |
| CN104722393A (en) * | 2015-03-19 | 2015-06-24 | 长沙矿冶研究院有限责任公司 | Beneficiation method for improving fine grain specularite recovery |
| CN106311438A (en) * | 2016-08-19 | 2017-01-11 | 鞍钢集团矿业有限公司 | Low-grade Anshan magnetite beneficiation process |
| CN110498624A (en) * | 2018-05-17 | 2019-11-26 | 南京梅山冶金发展有限公司 | The method that iron tailings wholegrain grade prepares cement irony correction material |
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