CN116213101A - Method for improving mineral dressing efficiency of refractory tin polymetallic ores - Google Patents
Method for improving mineral dressing efficiency of refractory tin polymetallic ores Download PDFInfo
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- CN116213101A CN116213101A CN202310086480.7A CN202310086480A CN116213101A CN 116213101 A CN116213101 A CN 116213101A CN 202310086480 A CN202310086480 A CN 202310086480A CN 116213101 A CN116213101 A CN 116213101A
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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
- 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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/52—Mechanical processing of waste for the recovery of materials, e.g. crushing, shredding, separation or disassembly
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Abstract
A method for improving mineral dressing efficiency in refractory tin polymetallic ores comprises the following steps: desliming and dewatering of middlings; (2) reselection enrichment; (3) grinding; (4) floatation; (5) magnetic separation; and (5) reselecting and collecting tin. The method is mainly characterized in that desliming, impurity removal and iron removal are carried out on ore feeding of a central ore shaking table by utilizing gravity separation and magnetic separation equipment, so that the enrichment ratio of tin metal is improved, the ore dressing efficiency of the tin polymetallic ore is improved, the recovery rate of tin to raw ore is improved from 4.32% to 4.95%, and the recovery rate of tin to raw ore is improved by 0.63% points.
Description
Technical Field
The invention relates to the technical field of metal ore dressing, in particular to a method for improving ore dressing efficiency in refractory tin multi-metal ores.
Background
The important metals indispensable in the life and production of cassiterite are increasingly reduced in the reserves of cassiterite, and the exploitation is increasingly difficult. At present, the tin-containing ores in China are mainly low-grade tin multi-metal mixed ores, the treatment grade is reduced year by year, and the requirements on tin recovery technology are higher and higher along with the gradual depletion of the grade of raw ores. A large amount of tin middlings are often generated in the production process of the tin concentrating mill, and the tin middlings can be recycled after further treatment, so that along with gradual development and utilization of mineral resources, the gangue content in the ore is increased, and gangue impurities entering the tin middlings are increased. In order to improve the beneficiation recovery rate of the refractory tin ore, the recovery of the medium-grade tin must be enhanced while the main tin-selecting index is ensured, and how to improve the beneficiation efficiency of the medium-grade ore becomes a great difficulty for the public relations of beneficiation technicians.
Because the tin and the lead zinc sulphide ore exist together in the tin polymetallic ore, especially in middlings, the tin mainly exists in a coherent form, the granularity difference is large, more mud can be generated in the ore grinding process only by further ore grinding, and meanwhile, part of pyrrhotite exists in the middlings, the density of the pyrrhotite is close to that of the cassiterite, and the pyrrhotite in the minerals is difficult to remove by single-use reselection. To improve the mineral separation efficiency of the tin polymetallic ores, desliming, impurity removal and iron removal are necessary, and the interference is reduced.
Chinese patent CN201310414226.1 proposes a quality classifying and sorting process for tin middlings, which comprises the following steps: (1) grading coarse sand table tailings once; (2) Enriching primary classified coarse-grain sand settling ores and front heavy tailings; (3) Carrying out secondary classification on the primary classified overflow ore and fine sand table tailings; (4) Mixing the secondary classified sand sedimentation ore with the concentrate separated in the step (2), and then classifying for three times; (5) And classifying the classified overflow ore for four times, wherein the classified sand-sinking ore for four times is subjected to flotation and desulfurization and then is separated by a shaking table to obtain middling tin concentrate and tailings, and the classified overflow ore for four times is subjected to desliming, desulfurization and floatation and tin floatation to obtain sulfide ore, tin concentrate and tailings respectively. The process solves the problems of small ore pulp concentration, large particle size difference, serious two-pole differentiation of grinding granularity and low concentrate grade and recovery rate in the main flow of the tin ore dressing plant, improves the tin recovery rate by 2.14%, reduces the tailing discharge amount by 2.7 ten thousand tons, and simultaneously reduces the energy consumption and the medicine consumption. However, the process can not effectively remove the interference of the estrus-pyrite on tin recovery because of no magnetic separation, so that the tin concentrate contains more impurities.
Disclosure of Invention
The invention aims at solving the problems of over-high ore mud content, over-low tin grade and influence on the recovery rate of a middling system in low-grade complex tin multi-metal ore, and provides a method for improving mineral separation of refractory tin multi-metal ore, so as to solve the defects in the prior art.
In order to solve the technical problems, the invention is realized by the following scheme: a method for improving mineral separation efficiency of refractory tin polymetallic ores, which comprises (1) desliming and dewatering the ores; (2) reselection enrichment; (3) grinding; (4) floatation; (5) magnetic separation; and (6) reselecting and collecting tin. The method comprises the following specific steps:
(1) Desliming and dewatering the middlings, and removing water and part of fine-fraction mud to obtain settled sand;
(2) Carrying out reselection enrichment on the settled sand obtained in the step (1) to obtain enriched concentrate;
(3) Grinding the concentrate enriched in the step (2) to obtain grinding ore discharge;
(4) Carrying out desulfurization flotation on the ore grinding and ore discharging in the step (3) to obtain sulfide ore and tin-containing middling;
(5) Carrying out magnetic separation on the tin-containing middlings in the step (4) to obtain estrpyrite and magnetic separation tailings;
(6) And (3) carrying out reselection and tin recovery on the magnetic separation tailings in the step (5).
The middling desliming and dewatering equipment in the step (1) is a dewatering hopper, and aims to dewater and remove part of fine-fraction mud.
The reselection enrichment equipment in the step (2) is a sawtooth wave jigger and spiral chute combined equipment. The purpose is to enrich the coarse fraction of useful minerals while throwing away part of the waste rock.
The enrichment ratio of the reselection enrichment in the step (2) is more than or equal to 2.5.
The waste disposal rate of the tailings waste disposal in the step (2) is more than or equal to 20 percent.
The ore grinding equipment in the step (3) is a ball mill, and the added ore grinding medium is steel forging.
The desulfurization flotation process in the step (4) is a coarse three-sweep three-fine process. The purpose is to effectively separate sulphide ores and tin-containing ores.
The magnetic separation equipment in the step (5) is a weak magnetic separator, and the field intensity is less than or equal to 3000GS, so as to remove the influence of partial estrus iron ore in minerals on subsequent separation.
The iron removal rate of the magnetic separation in the step (5) is more than or equal to 5 percent.
And (3) the reselection equipment in the step (6) is a shaking table.
Due to the adoption of the technical scheme, compared with the prior art, the invention has the following beneficial effects:
1. the invention adopts partial gravity separation and magnetic separation equipment to desliming and impurity removal of the ore fed by the middle ore shaking table, and improves the enrichment ratio of tin metal, thereby improving the ore dressing efficiency of the tin middling.
2. The spiral chute is added behind the saw tooth wave jigger, so that tin metal can be better enriched, the ore waste throwing rate is improved, the enrichment ratio is increased to be more than or equal to 2.5 from 1.5-2, and the waste throwing rate is increased to 20% from 15%.
3. After desulfurization and flotation, a magnetic separator is added, so that about 6% of interference of the estrpyrite on the subsequent middling shaking table separation can be removed.
4. The method of the invention improves the operation recovery rate of the middling system by 5 percent and improves the whole tin recovery rate by 0.63 percent.
Drawings
FIG. 1 is a flow chart of the prior art of a middling system.
Fig. 2 is a process flow diagram of a modified middling system.
Detailed Description
The invention is further illustrated in the following figures and examples, which are only illustrative of the invention and are not limiting thereof.
Example 1
As shown in fig. 2, the embodiment is a specific embodiment of the method for improving the mineral separation efficiency of refractory tin polymetallic ores, which comprises the steps of desliming and dehydration of the middlings; carrying out reselection enrichment; grinding; flotation; magnetic separation; the tin recovery step comprises the following steps:
(1) Desliming and dehydration of the middling: firstly, carrying out grading desliming and dehydration on the entering material, and removing part of argillaceous to obtain coarse-grain settled sand and fine-grain overflow;
(2) Enriching coarse-grain sand obtained in the step (1) by using a gravity separation device to obtain enriched concentrate;
(3) Grinding the concentrate enriched in the step (2) by using a grinding machine, so that the intergrowth in the tin-containing ore is fully dissociated, and grinding and discharging are obtained;
(4) Carrying out desulfurization flotation on the ore grinding and ore discharging in the step (3) to obtain sulfide ore and tin-containing middling;
(5) Carrying out magnetic separation on the tin-containing middlings in the step (4), further removing the pyrite in the tin-containing middlings to obtain magnetic separation tailings, and enabling the magnetic separation tailings to enter a middling shaking table;
(6) And (3) carrying out reselection and tin recovery on the magnetic separation tailings in the step (5).
The middling desliming and dewatering equipment in the step (1) is a dewatering hopper, and aims to dewater and remove part of fine-fraction mud.
The reselection enrichment equipment in the step (2) is a sawtooth wave jigger and spiral chute combined equipment. The purpose is to enrich the coarse fraction useful minerals, and the enrichment ratio is more than or equal to 2.5; the waste stone throwing rate in the tailings is more than or equal to 20 percent. The enrichment ratio of the tin metal of the saw tooth wave jigger is 1.72, the enrichment ratio of the tin metal of the spiral chute is 1.66, and the total enrichment ratio of the tin metal is 2.86; the waste throwing rate of the saw tooth wave jigger is 14.23%, the waste throwing rate of the spiral chute is 8.34%, and the total waste throwing rate is 22.57%;
and (3) grinding the steel forging by adopting a ball mill as a grinding medium of the ball mill.
The desulfurization flotation process in the step (4) is a coarse three-sweep three-fine process. The purpose is to effectively separate the sulphide minerals and the tin-containing minerals.
The magnetic separation equipment in the step (5) is a low-intensity magnetic separator, and the field intensity of the magnetic separator is 2500GS; the purpose is to remove the influence of partial estramustine in the minerals on the subsequent sorting. The impurity removal rate of the magnetic separator is 7.22%; the tin loss rate was 0.23%.
And (3) the reselection equipment in the step (6) is a shaking table.
Example 2
This example differs from example 1 in that the magnetic separator field strength became 2000GS.
After the field intensity is changed, the impurity removal rate of the magnetic separator is 6.12%, and the tin loss rate is 0.22%.
Example 3
The difference between this example and example 1 is that the magnetic separator field strength became 3000GS.
After the field intensity is changed, the impurity removal rate of the magnetic separator is 7.36%, and the tin loss rate is 0.82%.
Comparative example 1, example 2 and example 3 the magnetic separation effect was best when the magnetic separator field strength was 2500 GS.
After the method is adopted, the beneficiation efficiency of the tin middling is effectively improved, and the tin recovery indexes of the new process and the original process flow are shown in table 1.
TABLE 1 tin recovery index comparison results
| Project name | Feed Sn grade | Concentrate Sn grade/% | Sn working recovery/% | Sn recovery/% |
| Original technology | 0.22 | 33.58 | 36.33％ | 4.32 |
| New technology | 0.22 | 40.12 | 41.53 | 4.95 |
From the results of Table 1, it can be seen that after the novel method of the invention is adopted, the operation recovery rate of the tin middling system is improved from 36.33% to 41.53%, the Sn grade of the concentrate is improved from 33.58% to 40.12%, the recovery rate of tin to raw ore is improved from 4.32% to 4.95%, and the recovery rate of tin is improved by 0.63 percentage points.
Claims (8)
1. A method for improving mineral separation efficiency of refractory tin polymetallic ores comprises (1) desliming and dewatering of the ores; (2) reselection enrichment; (3) grinding; (4) floatation; (5) magnetic separation; (6) The method is characterized by comprising the following steps of:
(1) Desliming and dewatering the middlings, and removing water and part of fine-fraction mud to obtain settled sand;
(2) Carrying out reselection enrichment on the settled sand obtained in the step (1) to obtain enriched concentrate;
(3) Grinding the concentrate enriched in the step (2) to obtain grinding ore discharge;
(4) Carrying out desulfurization flotation on the ore grinding and ore discharging in the step (3) to obtain sulfide ore and tin-containing middling;
(5) Carrying out magnetic separation on the tin-containing middlings in the step (4) to obtain estrpyrite and magnetic separation tailings;
(6) And (3) carrying out reselection and tin recovery on the magnetic separation tailings in the step (5).
2. The method for improving mineral separation efficiency of refractory tin polymetallic ores of claim 1, wherein the equipment for desliming and dewatering the middlings in step (1) is a dewatering hopper.
3. The method for improving mineral separation efficiency of refractory tin polymetallic ores of claim 1, wherein the reselection enrichment equipment in step (2) is a sawtooth jigger and spiral chute combined equipment.
4. The method for improving mineral separation efficiency in refractory tin polymetallic ores of claim 1, wherein the ore grinding equipment in step (3) adopts a ball mill.
5. The method for improving mineral separation efficiency in refractory tin polymetallic ores of claim 1, wherein the grinding medium in step (3) is steel forging.
6. The method for improving mineral separation efficiency in refractory tin polymetallic ores of claim 1, wherein the desulfurization flotation process of step (4) is a coarse, a triple-sweep, and a triple-fine.
7. The method for improving mineral separation efficiency of refractory tin polymetallic ores according to claim 1, wherein the magnetic separation equipment in the step (5) is a low-intensity magnetic separator, and the field intensity is less than or equal to 3000GS.
8. The method for improving mineral separation efficiency in refractory tin polymetallic ores of claim 1, wherein the reselection equipment in step (6) is a shaker.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310086480.7A CN116213101A (en) | 2023-02-09 | 2023-02-09 | Method for improving mineral dressing efficiency of refractory tin polymetallic ores |
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| CN202310086480.7A CN116213101A (en) | 2023-02-09 | 2023-02-09 | Method for improving mineral dressing efficiency of refractory tin polymetallic ores |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117181411A (en) * | 2023-08-29 | 2023-12-08 | 广西华锡有色金属股份有限公司 | A kind of production technology of tin ore powder |
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2023
- 2023-02-09 CN CN202310086480.7A patent/CN116213101A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117181411A (en) * | 2023-08-29 | 2023-12-08 | 广西华锡有色金属股份有限公司 | A kind of production technology of tin ore powder |
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