CN114308370A - Mixed iron ore grinding magnetic separation quality improvement sand making process - Google Patents
Mixed iron ore grinding magnetic separation quality improvement sand making process Download PDFInfo
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- CN114308370A CN114308370A CN202011033483.7A CN202011033483A CN114308370A CN 114308370 A CN114308370 A CN 114308370A CN 202011033483 A CN202011033483 A CN 202011033483A CN 114308370 A CN114308370 A CN 114308370A
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Abstract
The invention relates to a mixed iron ore grinding magnetic separation quality-improving sand making process, which comprises the following steps: the method comprises the steps of primary ore grinding, magnetic separation, secondary ore grinding, screening and sorting, iron tailing production and the like. The invention provides a mixed iron ore grinding magnetic separation quality improvement sand making process, which adopts a magnetic separation quality improvement sand making process technology and a method for refractory mixed iron ores containing magnetite, hematite, siderite and the like in an ore grinding stage, and discards impurities such as coarse fraction tailings, gangue and the like in the ground ores in advance, thereby improving the production efficiency of iron ore concentrates of two-stage ore grinding and post-process, reducing the power consumption of an ore grinding section of ore dressing, reducing the production cost of spare part material consumption and the like, and improving the production efficiency. The tailings subjected to magnetic separation and waste disposal are processed into machine-made sand and a cement correcting agent in a grading grade manner, so that the tailings are completely recycled and comprehensively utilized, and the aim of zero discharge of mine tailings is fulfilled. The method meets the national green and environmental protection requirements, supports the national economic construction and development, and creates good economic benefits for mine enterprises.
Description
Technical Field
The invention relates to a mixed iron ore grinding magnetic separation quality improvement sand making process, and belongs to the technical field of environmental protection.
Background
In recent years, the steel industry in China is rapidly developed, the demand of iron ore concentrates by domestic steel enterprises is more and more great, and compared with foreign iron ores, iron ore resources in China have the characteristics of less rich ores, more lean ores, poor ore, fine impurities and the like, and the iron ore resources in China have fine embedded granularity, are closely symbiotic with gangue minerals and have high separation difficulty. The traditional mine production process has large discharge amount of fine-grained wet tailings, and the treatment of the fine-grained wet tailings becomes a bottleneck restricting the sustainable survival and development of mines. The low-grade tailings and gangue minerals produced in mine production are discarded to cause the waste of mine resources.
Disclosure of Invention
The invention aims to solve the technical problems that: the technology and the method overcome the defects of the technology, and provide a process technology and a method for refining sand by grinding and magnetic separation of mixed iron ores, and provide a technology and a method for separating and refining sand by using an internal rotary magnetic separator after grinding the mixed iron ores which are difficult to separate and contain magnetite, hematite and siderite in one section, so that wide-grade separation can be realized, the separation of magnetite, hematite and siderite can be realized while optimizing the external magnetic system structure of the magnetic separator, low-grade coarse-grade tailings are pre-selected in advance and processed into machine-made sand, and low-grade fine-grade tailings are processed into cement correcting agents. The waste is subjected to magnetic separation, pre-selection and waste disposal after the first-stage ore grinding, so that the production load of the second-stage ore grinding is reduced, the production operation efficiency of the subsequent process is improved, the power consumption of ore grinding is reduced, and the fine-fraction wet tail amount is greatly reduced.
In order to solve the technical problems, the technical scheme provided by the invention is as follows: a mixed iron ore grinding magnetic separation quality improvement sand making process comprises the following steps:
step 1: grinding the ore for the first time; the size fraction 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 grinding operation, the 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; the first-stage ball mill discharges ore and feeds the ore into an ore feeding box of an internal rotary magnetic separator, and water is added to control the ore feeding concentration of the internal rotary magnetic separator to be 20-50%; the installation angle of the internal rotation type magnetic separator is 6-8 degrees; the surface magnetic field intensity of the weak magnetic section inner cylinder of the internal rotation type magnetic separator is 3000-4000 Oe, and the surface magnetic field intensity of the strong magnetic section inner cylinder is 6500-7000 Oe; the tailing grade of the internal rotary magnetic separator is less than 22 percent, wherein the iron-containing grade of a coarse fraction which is more than 0.2mm is less than 20 percent; the concentrate yield of the internal rotary magnetic separator is more than 78%;
and step 3: grinding ore in the second stage; magnetic concentrate is adsorbed on a cylinder of the internal rotation type magnetic separator under the action of a magnetic field, is rinsed with rinsing water along with the rotation of the cylinder, is separated from a magnetic system area above a concentrate chute and is flushed to the concentrate chute by the rinsing water, and the magnetic concentrate automatically flows into a two-stage ball mill; feeding the ore discharged by the second-stage ball milling into a cyclone group through a slurry pump, wherein the size of a sand setting nozzle of the cyclone group is 90mm, feeding the ore pulp underflow after classification of the cyclone group into the second-stage ball milling 3, and feeding the overflow of the cyclone group into the process selection operation after flotation;
and 4, step 4: screening and sorting; the magnetic separation tailings of the internal rotation type magnetic separator automatically flow into a high-frequency sieve for screening and sorting, the mesh size of a screen of the high-frequency sieve is 0.5-1 mm, a variable cone hydrocyclone group is fed below the screen of the high-frequency sieve, the size of a sand setting nozzle of the variable cone hydrocyclone group is 2-3 mm, the underflow of the variable cone hydrocyclone group is fed into a negative inclination angle high-frequency fine sieve for screening, the mesh size of the screen of the negative inclination angle high-frequency fine sieve is 0.15-0.3 mm, and products on the screen of the negative inclination angle high-frequency fine sieve and products on the screen of the high-frequency sieve are mixed and processed into machine-made sand serving as building material products and are stacked in a sand making bin;
and 5: producing iron tailings; and the overflow of the variable cone hydrocyclone unit is fed into a ceramic filter for filtering and dewatering, and is processed into iron tailings, wherein the iron-containing grade of the iron tailings is 18-21 percent, and the iron tailings are used as an iron medium correcting agent product in a cement plant.
The invention provides a mixed iron ore grinding magnetic separation quality improvement sand making process, which adopts a magnetic separation quality improvement sand making process technology and a method for refractory mixed iron ores containing magnetite, hematite, siderite and the like in an ore grinding stage, and discards impurities such as coarse fraction tailings, gangue and the like in the ground ores in advance, thereby improving the production efficiency of iron ore concentrates of two-stage ore grinding and post-process, reducing the power consumption of an ore grinding section of ore dressing, reducing the production cost of spare part material consumption and the like, and improving the production efficiency. The tailings subjected to magnetic separation and waste disposal are processed into machine-made sand and a cement correcting agent in a grading grade manner, so that the tailings are completely recycled and comprehensively utilized, and the aim of zero discharge of mine tailings is fulfilled. The method meets the national green and environmental protection requirements, supports the national economic construction and development, and creates good economic benefits for mine enterprises.
Drawings
Fig. 1 is a schematic structural diagram of a preferred embodiment of the present invention.
Detailed Description
Examples
The process for producing the sand by magnetic separation and upgrading of the ground mixed iron ore mainly uses equipment shown in figure 1, and comprises a first-stage ball mill 1, an internal rotation type magnetic separator 2, a second-stage ball mill 3, a cyclone group 4, a high-frequency sieve with a large inclination angle 5, a super-long variable-cone hydrocyclone group 6, a high-frequency fine sieve with a negative inclination angle 7 and a ceramic filter 8.
The method comprises the following steps:
step 1: grinding the ore for the first time; 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 1 for grinding operation, the 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%, the separation of part of coarse particle embedded gangue minerals and iron mineral monomers is realized, and the ore discharge concentration is 80-83%;
step 2: magnetic separation; discharging ore from a first-stage ball mill 1 and feeding the ore into an ore feeding box of an internal rotary magnetic separator 2, and adding water to control the ore feeding concentration of the internal rotary magnetic separator 2 to be 20-50%; the ore 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 rotary magnetic separator is 6-8 degrees, the self-flowing of ore pulp in the internal rotary magnetic separator 2 can be met, and the ore pulp can pre-select and discard low-grade ores and impurity-mixed gangue under the composite action force of gravity, magnetic force and flushing water; the surface magnetic field intensity of the inner cylinder of the weak magnetic section of the internal rotary magnetic separator 2 is 3000-4000 Oe, the surface magnetic field intensity of the inner cylinder of the strong magnetic section is 6500-7000Oe, and the strong magnetic minerals of magnetite, hematite and siderite can be effectively recovered; after the first magnetic separation, throwing out part of low-grade coarse fraction tailings in advance, wherein the grade of the magnetic concentrate of the internal rotary magnetic separator 2 is improved by 5-7 percentage points compared with the grade of iron entering grinding ore; the tailing grade of the internal rotary magnetic separator is less than 22 percent, wherein the iron-containing grade of the coarse fraction which is more than 0.2mm is less than 20 percent; the concentrate yield of the internal rotary magnetic separator is more than 78%;
and step 3: grinding ore in the second stage; the magnetic concentrate is absorbed on a cylinder of the internal rotation type magnetic separator 2 under the action of a magnetic field, is rinsed by rinsing water along with the rotation of the cylinder, is separated from a magnetic system area above a concentrate chute, is washed to the concentrate chute by the rinsing water, and automatically flows into a two-stage ball mill 3; feeding the ore discharged by the second-stage ball milling 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 the ore pulp underflow after classification of the cyclone group 4 into a second-stage ball milling 3, and feeding the overflow of the cyclone group 4 into the process sorting operation after flotation; the magnetic separation of the internal rotary magnetic separator is added after the first-stage ore grinding, so that the production processing capacity of the second-stage ore grinding can be improved by 22%, the power consumption in the ore dressing and grinding stage and the like can be reduced, and the ore grinding production efficiency can be improved;
and 4, step 4: screening and sorting; the magnetic separation tailings of the internal rotation type magnetic separator 2 automatically flow into a large-inclination-angle high-frequency sieve 5 for screening and sorting, the mesh size of the screen of the large-inclination-angle high-frequency sieve 5 is 0.5-1 mm, a phi 250 ultra-long variable-cone hydrocyclone unit 6 is fed under the screen of the large-inclination-angle high-frequency sieve 5, the size of a sand setting nozzle of the ultra-long variable-cone hydrocyclone unit 6 is 2-3 mm, the underflow of the ultra-long variable-cone hydrocyclone unit 6 is fed into a negative-inclination-angle high-frequency fine sieve 7 for screening, the mesh size of the screen of the negative-inclination-angle high-frequency fine sieve 7 is 0.15-0.3 mm, and the product on the screen of the negative-inclination-angle high-frequency fine sieve 7 and the product on the screen of the large-inclination-angle high-frequency sieve 5 are mixed and processed into machine-made sand as a building material product and are stacked in a machine-made sand bin;
and 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 is processed into iron tailings, the iron-containing grade of the iron tailings is 18-21%, and the iron tailings are used as an iron medium correcting agent product in a cement plant.
The present invention is not limited to the above-described embodiments. All technical solutions formed by equivalent substitutions fall within the protection scope of the claims of the present invention.
Claims (1)
1. The mixed iron ore grinding magnetic separation quality improvement sand making process is characterized by comprising the following steps of:
step 1: grinding the ore for the first time; the size fraction 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 grinding operation, the 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; the first-stage ball mill discharges ore and feeds the ore into an ore feeding box of an internal rotary magnetic separator, and water is added to control the ore feeding concentration of the internal rotary magnetic separator to be 20-50%; the installation angle of the internal rotation type magnetic separator is 6-8 degrees; the surface magnetic field intensity of the weak magnetic section inner cylinder of the internal rotation type magnetic separator is 3000-4000 Oe, and the surface magnetic field intensity of the strong magnetic section inner cylinder is 6500-7000 Oe; the tailing grade of the internal rotary magnetic separator is less than 22 percent, wherein the iron-containing grade of a coarse fraction which is more than 0.2mm is less than 20 percent; the concentrate yield of the internal rotary magnetic separator is more than 78%;
and step 3: grinding ore in the second stage; magnetic concentrate is adsorbed on a cylinder of the internal rotation type magnetic separator under the action of a magnetic field, is rinsed with rinsing water along with the rotation of the cylinder, is separated from a magnetic system area above a concentrate chute and is flushed to the concentrate chute by the rinsing water, and the magnetic concentrate automatically flows into a two-stage ball mill; feeding the ore discharged by the second-stage ball milling into a cyclone group through a slurry pump, wherein the size of a sand setting nozzle of the cyclone group is 90mm, feeding the ore pulp underflow after classification of the cyclone group into the second-stage ball milling 3, and feeding the overflow of the cyclone group into the process selection operation after flotation;
and 4, step 4: screening and sorting; the magnetic separation tailings of the internal rotation type magnetic separator automatically flow into a high-frequency sieve for screening and sorting, the mesh size of a screen of the high-frequency sieve is 0.5-1 mm, a variable cone hydrocyclone group is fed below the screen of the high-frequency sieve, the size of a sand setting nozzle of the variable cone hydrocyclone group is 2-3 mm, the underflow of the variable cone hydrocyclone group is fed into a negative inclination angle high-frequency fine sieve for screening, the mesh size of the screen of the negative inclination angle high-frequency fine sieve is 0.15-0.3 mm, and products on the screen of the negative inclination angle high-frequency fine sieve and products on the screen of the high-frequency sieve are mixed and processed into machine-made sand serving as building material products and are stacked in a sand making bin;
and 5: producing iron tailings; the overflow of the variable cone hydraulic cyclone set is fed into a ceramic filter for filtering and dewatering, and is processed into iron tailings, the iron-containing grade of the iron tailings is 18-21%, and the iron tailings are used as a cement plant iron medium correcting agent product.
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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 |
-
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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