CN113117880A - Beneficiation process and beneficiation system for high-vanadium titano-magnetite - Google Patents
Beneficiation process and beneficiation system for high-vanadium titano-magnetite Download PDFInfo
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- CN113117880A CN113117880A CN202110379459.7A CN202110379459A CN113117880A CN 113117880 A CN113117880 A CN 113117880A CN 202110379459 A CN202110379459 A CN 202110379459A CN 113117880 A CN113117880 A CN 113117880A
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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
- 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
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C21/00—Disintegrating plant with or without drying of the material
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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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- 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
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C1/00—Magnetic separation
- B03C1/02—Magnetic separation acting directly on the substance being separated
- B03C1/30—Combinations with other devices, not otherwise provided for
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Abstract
The invention discloses a beneficiation process and a beneficiation system for high vanadium titano-magnetite, which adopt the following process steps: (1) carrying out first-stage ball milling on pre-selected concentrate obtained by wet pre-selecting the ore pulp of the high vanadium titano-magnetite; performing spiral grading on ore discharge of the first-stage ball milling, returning settled sand subjected to spiral grading to the first-stage ball milling, and performing first-stage magnetic separation on overflow subjected to spiral grading; (2) performing cyclone separation on the concentrate subjected to the first-stage magnetic separation, and feeding overflow of the cyclone separation into high-frequency screening; returning the oversize product subjected to high-frequency screening and the settled sand subjected to cyclone separation to the second-stage ball milling, and returning ore discharge of the second-stage ball milling to perform cyclone separation again; feeding the undersize product subjected to high-frequency screening into a second section for magnetic separation; (3) the concentrate subjected to the second-stage magnetic separation is fed into the first-stage elutriation magnetic separation, and the concentrate subjected to the first-stage elutriation magnetic separation is fed into the second-stage elutriation magnetic separation; and the concentrate obtained by the second-stage elutriation and magnetic separation is the iron concentrate powder product. The process has the advantages of high recovery rate, good quality, reliable operation and high production efficiency.
Description
Technical Field
The invention relates to a beneficiation process and a beneficiation system, in particular to a beneficiation process and a beneficiation system for high-vanadium titano-magnetite.
Background
Iron is an important industrial raw material and has a wide industrial application. The main current beneficiation method is magnetic separation or flotation, but in the high vanadium titano-magnetite beneficiation, the produced iron concentrate has low grade due to the ore property and the beneficiation process, the grade of the iron concentrate is always below 60%, and the high grade iron concentrate is difficult to be separated.
In the market, the sale price of the refined iron powder is directly related to the grade of the refined iron powder, and the higher the iron grade of the refined iron powder is, the higher the sale price of the refined iron powder is, so that if the iron grade of the product of the vanadium titano-magnetite can be further improved, the economic benefit can be effectively improved, and therefore, the iron-extracting impurity-reducing mineral separation process of the high vanadium titano-magnetite is required to be developed.
Disclosure of Invention
The invention aims to solve the technical problem of providing a high-vanadium titano-magnetite beneficiation process with high grade of iron concentrate powder; the invention also provides a high vanadium titano-magnetite beneficiation system.
In order to solve the technical problem, the process of the invention adopts the following process steps: (1) carrying out first-stage ball milling on pre-selected concentrate obtained by wet pre-selecting the ore pulp of the high vanadium titano-magnetite; performing spiral grading on ore discharge of the first-stage ball milling, returning settled sand subjected to spiral grading to the first-stage ball milling, and performing first-stage magnetic separation on overflow subjected to spiral grading;
(2) performing cyclone separation on the concentrate subjected to the first-stage magnetic separation, and feeding overflow of the cyclone separation into high-frequency screening; returning the oversize product subjected to high-frequency screening and the settled sand subjected to cyclone separation to the second-stage ball milling, and returning ore discharge of the second-stage ball milling to perform cyclone separation again; feeding the undersize product subjected to high-frequency screening into a second section for magnetic separation;
(3) the concentrate subjected to the second-stage magnetic separation is fed into the first-stage elutriation magnetic separation, and the concentrate subjected to the first-stage elutriation magnetic separation is fed into the second-stage elutriation magnetic separation; and the concentrate obtained by the second-stage elutriation and magnetic separation is the iron concentrate powder product.
In the step (3) of the process, the tailings subjected to the first-stage elutriation and magnetic separation and the second-stage elutriation and magnetic separation are subjected to inclined plate concentration; and overflow backwater after the inclined plate concentration and precipitation enters a first section of elutriation magnetic separation and a second section of elutriation magnetic separation to be used as flushing water, and underflow after the inclined plate concentration is used as selected tailings and returns to the second section of ball milling.
The tailings subjected to wet type pre-selection in the process are subjected to linear screening, and undersize products subjected to linear screening and the tailings subjected to first-stage magnetic separation and second-stage magnetic separation are final tailings.
In the step (2) of the process, the granularity of the product on the high-frequency screening sieve is more than 0.15 mm.
The wet-type pre-selection magnetic field intensity of the process is 4000-5000 Gs, the magnetic field intensity of the first-stage magnetic separation is 2500-3000 Gs, and the magnetic field intensity of the second-stage magnetic separation is 2000-2500 Gs.
The system comprises a wet preselector, two sections of ball mills, two sections of magnetic separators and two sections of elutriation magnetic separators;
a pre-concentration concentrate outlet of the wet pre-concentration machine is communicated with an inlet of the first section of ball mill, and an outlet of the first section of ball mill is communicated with an inlet of the spiral classifier; a sand setting outlet of the spiral classifier is communicated with an inlet of the first section of ball mill, and an overflow outlet of the spiral classifier is communicated with an inlet of the first section of magnetic separator;
the concentrate outlet of the first-stage magnetic separator is communicated with the inlet of a swirler, and the overflow outlet of the swirler is communicated with the inlet of a high-frequency sieve; an oversize outlet of the high-frequency sieve and a sand setting outlet of the cyclone are both communicated with an inlet of the second-stage ball mill, and an ore discharge outlet of the second-stage ball mill is communicated with an inlet of the cyclone; the undersize outlet of the high-frequency sieve is communicated with the inlet of the second section of magnetic separator;
and the concentrate outlet of the second section of magnetic separator is communicated with the inlet of the first section of elutriation magnetic separator, and the concentrate outlet of the first section of elutriation magnetic separator is communicated with the inlet of the second section of elutriation magnetic separator.
In the system, tailings outlets of a first-stage elutriation magnetic separator and a second-stage elutriation magnetic separator are communicated with an inclined plate thickener; the overflow port of the inclined plate concentrator is communicated with the flushing water inlets of the first section elutriation magnetic separator and the second section elutriation magnetic separator, and the underflow port of the inclined plate concentrator is communicated with the inlet of the second section ball mill.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in: the process can select the pre-selected concentrate and the pre-selected tailings through wet pre-selection, the iron grade of the pre-selected concentrate is greatly improved compared with that of fine ore, the ore feeding amount of the first-stage ball milling is reduced, the ore grinding treatment of most of waste rocks is avoided, the grinding and selecting cost can be greatly reduced, and the process has good economic benefit. Secondly, primary iron ore concentrate and tailings can be selected through a magnetic separation process, the grade of the iron ore concentrate is below 60%, and the primary iron ore concentrate is selected again through elutriation and magnetic separation, so that the grade of the ore concentrate is improved; the two-section tandem elutriation and magnetic separation is applied to recover high-grade iron concentrate products, the concentrated concentrate products are selected by magnetic particles in ore pulp under the combined action of magnetic force, gravity and ascending water impact force, and impurities in the ore pulp overflow to form tailings. In conclusion, the primary iron concentrate is recleaning through elutriation and magnetic separation, the concentrate grade is improved, the average iron concentrate grade is 62.4%, the average recovery rate is 97.5%, and the conventional magnetic separation can only reach 60.5% through multi-stage concentration. The process improves the grade of the iron ore concentrate by one grade, and simultaneously improves the tax sale price of the iron concentrate with the iron grade of 62 percent by 85 yuan per ton compared with the iron concentrate with the iron grade of 60 percent, thereby having obvious economic benefit. Therefore, the method is suitable for the mineral separation process of the high vanadium-titanium ore, the iron concentrate recovery rate is high, the quality is good, the operation is reliable, the production efficiency is high, and the domestic advanced level is reached.
The system effectively improves the concentrate grade through the wet preselection machine, the two-section ball mill, the two-section magnetic separator and the two-section elutriation magnetic separator, the average iron concentrate grade is 62.4 percent, the average recovery rate is 97.5 percent, and the system has the characteristics of high iron concentrate recovery rate, good quality, reliable operation, high production efficiency, good economic benefit and the like.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
FIG. 1 is a schematic diagram of the system of the present invention.
In the figure: a wet type preselector 1; a first stage ball mill 2; a spiral classifier 3; a first stage magnetic separator 4; a swirler 5; a high-frequency screen 6; a second-stage ball mill 7; a second stage magnetic separator 8; a first-stage elutriation magnetic separator 9; a second-stage elutriation magnetic separator 10; a swash plate thickener 11; a disc filter 12; a linear sieve 13; a tailings reclaimer 14.
Detailed Description
As shown in fig. 1, the high vanadium titano-magnetite beneficiation system comprises a wet preselection machine, two-section ball mills, two-section magnetic separators and two-section elutriation magnetic separators; wherein the first section ball mill 2 and the spiral classifier 3 are closed, and the second section ball mill 7, the cyclone 5 and the high-frequency sieve 6 are closed. A pre-concentration concentrate outlet of the wet pre-concentration machine 1 is communicated with an inlet of a first section of ball mill 2, and an outlet of the first section of ball mill 2 is communicated with an inlet of a spiral classifier 3; and a sand setting outlet of the spiral classifier 3 is communicated with an inlet of the first ball mill 2, and an overflow outlet of the spiral classifier 3 is communicated with an inlet of the first magnetic separator 4. A pre-separation tailing outlet of the wet pre-separator 1 is communicated with a linear sieve 13; the tailings are screened out from the oversize outlet of the linear screen 13.
As shown in fig. 1, a concentrate outlet of a first-stage magnetic separator 4 of the high vanadium titano-magnetite beneficiation system is communicated with an inlet of a cyclone 5, and an overflow outlet of the cyclone 5 is communicated with an inlet of a high-frequency sieve 6; an oversize outlet of the high-frequency sieve 6 and a sand setting outlet of the cyclone 5 are both communicated with an inlet of the second-stage ball mill 7, and a discharge outlet of the second-stage ball mill 7 is communicated with an inlet of the cyclone 5; and the undersize outlet of the high-frequency sieve 6 is communicated with the inlet of the second section of magnetic separator 8.
As shown in fig. 1, in the high vanadium titano-magnetite beneficiation system, a concentrate outlet of a second-stage magnetic separator 8 is communicated with an inlet of a first-stage elutriation magnetic separator 9, and a concentrate outlet of the first-stage elutriation magnetic separator 9 is communicated with an inlet of a second-stage elutriation magnetic separator 10; the concentrate outlet of the second-stage elutriation magnetic separator 10 is communicated with a disc filter 12, and the disc filter 12 discharges the fine powder of the high-vanadium titano-magnetite. Tailings outlets of the first-stage elutriation magnetic separator 9 and the second-stage elutriation magnetic separator 10 are both communicated with an inclined plate thickener 11; an overflow port of the inclined plate concentrator 11 is communicated with flushing water inlets of the first section of elutriation magnetic separator 9 and the second section of elutriation magnetic separator 10 through a pipeline, a centrifugal pump and a variable frequency motor; the running frequency of the motor is adjusted through the electric control cabinet, and the pressure of flushing water fed into the full-automatic elutriation magnetic separator is adjusted, so that the purpose of adjusting the separation of iron ore concentrates is realized; the underflow port of the inclined plate thickener 11 is communicated with the inlet of the second-stage ball mill 8.
As shown in fig. 1, the undersize outlet of the linear sieve 13, the tailings outlet of the first-stage magnetic separator 4 and the tailings outlet of the second-stage magnetic separator 8 of the high vanadium titano-magnetite beneficiation system are all communicated with the inlet of a tailings reclaimer 14; the recycling outlet of the tailings recycling machine 14 is communicated with the inlet of the first-stage magnetic separator 4. In this way, the tailings generated by the linear sieve 13, the first-stage magnetic separator 4 and the second-stage magnetic separator 8 enter the tailings reclaimer 14, a part of tailings is reclaimed by the tailings reclaimer 14 and fed into the first-stage magnetic separator 4, and the rest of tailings are treated into comprehensive tailings.
As shown in fig. 1, the high vanadium titano-magnetite beneficiation process comprises a beneficiation process of one-stage wet pre-concentration, two-stage ore grinding, two-stage magnetic separation, two-stage elutriation magnetic separation and one-stage filtration; wherein the first section of ball milling and spiral grading are closed, the second section of ball milling and cyclone separation and high-frequency screening are closed; the following technical process is adopted:
(1) the high vanadium titano-magnetite is crushed to produce fine ore with the granularity less than or equal to 8mm, and the fine ore is fully mixed with water to obtain ore pulp. Feeding the ore pulp into a wet preselector 1 for wet preselection, wherein the magnetic field intensity of the wet preselection is 4000-5000 Gs, and feeding the obtained preselection concentrate into a first-stage ball mill 2 for first-stage ball milling; feeding the discharged ore of the first-stage ball milling into a spiral classifier 3 for spiral classification; returning the settled sand subjected to spiral classification to the first-stage ball mill 2 for carrying out the first-stage ball milling again, feeding overflow subjected to spiral classification into the first-stage magnetic separator 4 for carrying out first-stage magnetic separation, wherein the magnetic field intensity of the first-stage magnetic separation is 2500-3000 Gs.
(2) Feeding the concentrate subjected to the first-stage magnetic separation into a cyclone 5 for cyclone separation; feeding the overflow of the cyclone separation into a high-frequency sieve 6 for high-frequency sieving; the oversize products with the granularity of more than 0.15mm screened by high frequency and the settled sand separated by the cyclone are fed into a second-stage ball mill 7 for second-stage ball milling, and the ore discharge of the second-stage ball milling is returned to the cyclone 5 for cyclone separation again; feeding the undersize product with the granularity of less than or equal to 0.15mm screened by the high frequency screening into a second-stage magnetic separator 8 for second-stage magnetic separation, wherein the magnetic field intensity of the second-stage magnetic separation is 2000-2500 Gs; the fineness of the concentrate obtained by the second-stage magnetic separation is-200 meshes and is controlled to be 65-70 wt%.
(3) And (3) feeding the concentrate subjected to the second-stage magnetic separation into a first-stage elutriation magnetic separator 9, performing first-stage elutriation magnetic separation under the action of magnetic force, gravity and flushing water, feeding the concentrate subjected to the first-stage elutriation magnetic separation into a second-stage elutriation magnetic separator 10 for second-stage elutriation magnetic separation, and feeding the concentrate subjected to the second-stage elutriation magnetic separation into a disc filter 12 for dehydration filtration to obtain the refined iron powder after concentration. Tailings obtained by the first-stage elutriation magnetic separation and the second-stage elutriation magnetic separation are fed into an inclined plate concentrator 11 for inclined plate concentration, and overflow with the solid content of less than or equal to 400mg/L obtained by the inclined plate concentration is used as washing water for production of the first-stage elutriation magnetic separation and the second-stage elutriation magnetic separation and returns to a first-stage elutriation magnetic separator 9 and a second-stage elutriation magnetic separator 10 for recycling; and the underflow with the concentration of more than or equal to 20wt% concentrated by the inclined plate is returned to the second-stage ball mill 7 as the concentration tailings for second-stage ball milling again.
(4) Feeding the tailings subjected to wet type pre-selection in the step (1) into a linear sieve 13 for linear sieving, wherein the oversize product with the granularity larger than 1mm subjected to linear sieving is tailings; and (3) enabling the undersize product with the granularity less than or equal to 1mm after linear screening and the tailings obtained by the first-stage magnetic separation and the second-stage magnetic separation to enter a tailing recycling machine 14, recycling a part of tailings through the tailing recycling machine 14 and feeding the part of tailings into the first-stage magnetic separator 4, and taking the rest tailings as final comprehensive tailings.
Example 1: and (3) feeding the ore pulp obtained by fully mixing the crushed 0-8 mm fine ore and water into a wet preselection machine, and throwing out part of impurities and nonmagnetic minerals in advance to obtain preselection concentrate. Feeding the pre-selected concentrate into a closed circuit of a first-stage ball mill and a spiral classifier, grinding and classifying to obtain a spiral classifier overflow with the fineness of 35-45% of-200 meshes, feeding the overflow into the first-stage permanent magnetic separator, carrying out magnetic separation to obtain a first-stage magnetic concentrate, feeding the first-stage magnetic concentrate into a closed circuit of a second-stage ball mill, a cyclone and a high-frequency sieve, grinding and classifying to obtain a product with the fineness of-200 meshes of 65-70%, and feeding into the second-stage permanent magnetic separator for further separation to obtain a second-stage magnetic concentrate with the iron grade of 60%. And feeding the second-stage magnetic concentrate into a two-stage elutriation magnetic separator, performing two-stage elutriation magnetic separation to obtain a product with the iron grade of more than 62%, and performing dehydration filtration to obtain iron concentrate powder with the iron grade of more than 62%, thereby achieving the purpose of further extracting iron and reducing impurities. The full-automatic elutriation magnetic separator is matched with an inclined plate concentrator for use: tailings of the first-stage and second-stage full-automatic elutriation magnetic separators are fed into an inclined plate thickener, overflow with the solid content not greater than 400mg/L of the inclined plate thickener is used as flushing water for production of the first-stage and second-stage full-automatic elutriation magnetic separators, and the flushing water returns to the full-automatic elutriation magnetic separators for recycling, so that recycling of overflow water is realized, and a large amount of water resources are saved. Through statistics, the grade of the obtained iron ore concentrate is average 62.4%, and the recovery rate is average 97.5%.
Claims (7)
1. The beneficiation process of the high vanadium titano-magnetite is characterized by comprising the following process steps: (1) carrying out first-stage ball milling on pre-selected concentrate obtained by wet pre-selecting the ore pulp of the high vanadium titano-magnetite; performing spiral grading on ore discharge of the first-stage ball milling, returning settled sand subjected to spiral grading to the first-stage ball milling, and performing first-stage magnetic separation on overflow subjected to spiral grading;
(2) performing cyclone separation on the concentrate subjected to the first-stage magnetic separation, and feeding overflow of the cyclone separation into high-frequency screening; returning the oversize product subjected to high-frequency screening and the settled sand subjected to cyclone separation to the second-stage ball milling, and returning ore discharge of the second-stage ball milling to perform cyclone separation again; feeding the undersize product subjected to high-frequency screening into a second section for magnetic separation;
(3) the concentrate subjected to the second-stage magnetic separation is fed into the first-stage elutriation magnetic separation, and the concentrate subjected to the first-stage elutriation magnetic separation is fed into the second-stage elutriation magnetic separation; and the concentrate obtained by the second-stage elutriation and magnetic separation is the iron concentrate powder product.
2. The beneficiation process for high vanadium titano-magnetite according to claim 1, characterized in that: in the step (3), the tailings subjected to the first-stage elutriation and magnetic separation and the second-stage elutriation and magnetic separation are subjected to inclined plate concentration; and overflow backwater after the inclined plate concentration and precipitation enters a first section of elutriation magnetic separation and a second section of elutriation magnetic separation to be used as flushing water, and underflow after the inclined plate concentration is used as selected tailings and returns to the second section of ball milling.
3. The beneficiation process for high vanadium titano-magnetite according to claim 1, characterized in that: and feeding the wet pre-selected tailings into a linear screening, wherein the undersize product subjected to the linear screening and the tailings subjected to the first-stage magnetic separation and the second-stage magnetic separation are final tailings.
4. The beneficiation process for high vanadium titano-magnetite according to claim 1, characterized in that: in the step (2), the granularity of the product on the high-frequency screening sieve is larger than 0.15 mm.
5. The beneficiation process of high vanadium titano-magnetite according to any one of claims 1 to 4, characterized in that: the magnetic field intensity of the wet pre-selection is 4000-5000 Gs, the magnetic field intensity of the first magnetic separation is 2500-3000 Gs, and the magnetic field intensity of the second magnetic separation is 2000-2500 Gs.
6. The utility model provides a high vanadium titano-magnetite ore dressing system which characterized in that: comprises a wet preselector (1), two sections of ball mills, two sections of magnetic separators and two sections of elutriation magnetic separators;
a pre-concentration concentrate outlet of the wet pre-concentration machine (1) is communicated with an inlet of the first section of ball mill (2), and an outlet of the first section of ball mill (2) is communicated with an inlet of the spiral classifier (3); a sand setting outlet of the spiral classifier (3) is communicated with an inlet of the first section of the ball mill (2), and an overflow outlet of the spiral classifier (3) is communicated with an inlet of the first section of the magnetic separator (4);
a concentrate outlet of the first-stage magnetic separator (4) is communicated with an inlet of a cyclone (5), and an overflow outlet of the cyclone (5) is communicated with an inlet of a high-frequency sieve (6); an oversize outlet of the high-frequency sieve (6) and a sand setting outlet of the cyclone (5) are both communicated with an inlet of the second-stage ball mill (7), and an ore discharge outlet of the second-stage ball mill (7) is communicated with an inlet of the cyclone (5); the undersize outlet of the high-frequency sieve (6) is communicated with the inlet of the second section of magnetic separator (8);
and the concentrate outlet of the second section of magnetic separator (8) is communicated with the inlet of the first section of elutriation magnetic separator (9), and the concentrate outlet of the first section of elutriation magnetic separator (9) is communicated with the inlet of the second section of elutriation magnetic separator (10).
7. The beneficiation system for high vanadium titano-magnetite according to claim 6, wherein: tailings outlets of the first-stage elutriation magnetic separator (9) and the second-stage elutriation magnetic separator (10) are communicated with an inclined plate thickener (11); an overflow port of the inclined plate concentrator (11) is communicated with washing water inlets of the first section elutriation magnetic separator (9) and the second section elutriation magnetic separator (10), and a underflow port of the inclined plate concentrator (11) is communicated with an inlet of the second section ball mill (7).
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| CN202110379459.7A CN113117880A (en) | 2021-04-08 | 2021-04-08 | Beneficiation process and beneficiation system for high-vanadium titano-magnetite |
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