CN114618649A - Method for selecting ore enrichment platinum group metal from spent automobile catalyst - Google Patents
Method for selecting ore enrichment platinum group metal from spent automobile catalyst Download PDFInfo
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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
- B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
- B02C17/10—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls with one or a few disintegrating members arranged in the container
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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
- B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
- B02C17/04—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls with unperforated container
- B02C17/08—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls with unperforated container with containers performing a planetary movement
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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
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/08—Separating or sorting of material, associated with crushing or disintegrating
- B02C23/14—Separating or sorting of material, associated with crushing or disintegrating with more than one separator
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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
- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D1/00—Flotation
- B03D1/001—Flotation agents
- B03D1/018—Mixtures of inorganic and organic compounds
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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
- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D1/00—Flotation
- B03D1/14—Flotation machines
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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
- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D2201/00—Specified effects produced by the flotation agents
- B03D2201/007—Modifying reagents for adjusting pH or conductivity
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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
- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D2201/00—Specified effects produced by the flotation agents
- B03D2201/02—Collectors
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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Abstract
The invention discloses a method for selecting ore and enriching platinum group metals from a spent automobile catalyst, which comprises the following steps: (1) pre-screening; (2) first-stage ball milling; (3) reselecting; (4) ball milling in the second stage; (5) grading; (6) and (4) carrying out flotation. According to the structural characteristics of the failed automobile catalyst, the failed automobile catalyst is treated by adopting the processes of pre-screening, closed-circuit ball milling, gravity separation, closed-circuit ball milling, flotation and scavenging, and compared with the processes of a fire method and a wet method, the method is energy-saving and environment-friendly and is an effective method for efficiently pre-enriching the platinum group metal in the failed automobile catalyst; according to the invention, efficient novel combined reagents are adopted for flotation, the collecting agents are sodium oleate and hydroximic acid, and betaine and cocoamine are matched, so that compared with a single flotation reagent system, the flotation effect is good, and the recovery rate of platinum group metals is high; the equipment used in the invention is conventional mineral processing equipment, the process flow is simple, the production cost is low, and the industrial large-scale production is easy to realize.
Description
Technical Field
The invention belongs to the technical field of platinum group metal secondary resource recovery, and particularly relates to a method for selecting ore enriched platinum group metals from a spent automobile catalyst.
Background
Platinum Group Metals (PGM) are an important strategic resource, and platinum, palladium and rhodium are widely used in the fields of alloy and catalysis due to excellent metal performance and catalytic characteristics. The geological reserves and annual yields of platinum group metals in China are low, and the platinum group metals are scarce. Taking platinum as an example, the geological reserve of platinum in China is 400 tons, and the annual output is about 3 tons. Although the geological reserves of the platinum group metals in China are low, the secondary resources are rich. The largest use of platinum, palladium, rhodium is as a catalyst in three-way catalysts. By the end of 2020, the quantity of automobiles in China is 2.8 hundred million, and 560 tons of platinum group metals are stored in a three-way catalytic converter calculated according to the fact that each automobile three-way catalytic converter contains 2g of platinum group metals, so that the three-way catalytic converter is a huge platinum group metal secondary resource treasure house. Therefore, the platinum group metal in the waste three-way catalyst is recovered, the problem of shortage of the platinum group metal in China is solved, and the method has important economic and environmental significance.
A three-way catalyst rich in platinum, palladium and rhodium is an important device installed in an exhaust system of an automobile for purifying exhaust gas. Mainly comprises a carrier and a coating. The carrier is a piece of porous ceramic material made of cordierite and does not itself participate in the catalytic reaction. A layer of coating containing rare and precious metals such as platinum, rhodium, palladium and the like is sprayed on the carrier, and the actual catalytic action is achieved. When high-temperature automobile exhaust passes through the purification device, three harmful gases of carbon monoxide, oxynitride and hydrocarbon in the exhaust are oxidized or reduced into nontoxic and harmless gas under the activation action of platinum group metal, so that the effect of purifying the exhaust is achieved. The service life of the automobile catalyst is usually 5-8 years, and the platinum group metal content is 1000-2000 g/t. The existing recovery method of the spent automobile catalyst mainly comprises a pyrogenic process (a lead capture method, a copper capture method, a nickel capture method, an iron capture method, a blunderbuss capture method, a plasma smelting method, a dry chlorination method and the like) and a wet process (an oxidation acid leaching method, a pressure cyaniding method and the like). The pyrogenic process is a technology of melting one or more mixed failure automobile catalyst powder in trapping agents (lead, copper, iron, nickel, blunderbuss and the like), and the trapping agents and platinum group metals form an alloy so as to separate the trapping agents from non-metal slag. The pyrometallurgical process has the series problems of high equipment requirement, high energy consumption, high cost, difficult treatment of a large amount of waste residues and the like. The wet process is to selectively dissolve the platinum group metals in the spent automobile catalyst so as to realize the separation and enrichment of the platinum group metals. The wet process generates a large amount of waste liquid, seriously pollutes the environment and has serious environmental protection problems.
Disclosure of Invention
The invention aims to provide a method for selecting ores to enrich platinum group metals from a spent automobile catalyst.
The invention discloses a method for selecting ore enriched platinum group metal from dead automobile catalyst, which comprises the following steps:
(1) pre-screening: crushing the spent automobile catalyst, and then pre-screening to obtain undersize materials and oversize materials;
(2) first-stage ball milling: performing first-stage ball milling on the oversize material obtained in the step (1), and screening after ball milling to obtain ball-milled undersize material and ball-milled oversize material;
(3) and (3) reselection: reselecting the undersize material subjected to ball milling in the step (2) to obtain reselected concentrate and reselected tailings;
(4) and (3) ball milling in the second stage: mixing the gravity concentrate obtained in the step (3) with the undersize material obtained in the step (1), and then carrying out two-stage ball milling to obtain a ball-milled material;
(5) grading: performing multi-stage classification on the ball-milled materials in the step (4) to obtain the final-stage classified materials above the sieve and the final materials below the sieve;
(6) flotation: performing flotation on the oversize material graded in the last stage in the step (5), wherein flotation concentrate is a platinum group metal enriched product; and (4) scavenging the flotation tailings, and returning scavenged concentrate to the flotation process.
In the step (1), the number of the pre-screened sieves is 60-100 meshes.
In the step (2), the number of the screened screens is 60-100 meshes; returning the oversize material after ball milling to the first-stage ball milling.
In the step (3), water is reselected as a reselection medium; and reselecting the tailings to be tailings 1.
In the step (5), the multi-stage classification is carried out into two-stage classification, and the mesh number of a first-stage classification screen is 150-250 meshes; the mesh number of the second-stage classifying screen is 350-450 meshes; returning the oversize material after the first stage of classification to the second stage of ball milling step in the step (4).
In the step (6), the mass concentration of the ore pulp is 25-35% during flotation; the flotation reagent system comprises: the collecting agent is the combination of sodium oleate and hydroximic acid; the emulsifier is the combination of betaine and cocoamine, and the pH regulator is NaOH; preferably, the mass ratio of the sodium oleate to the hydroximic acid is (3-5) to (1-3); the mass ratio of the betaine to the cocoamine is (1-3) to (1-3); further preferably, the addition amount of the collecting agent relative to the raw ore is 1200-1500 g/t; the addition amount of the emulsifier relative to the raw ore is 400-500 g/t; the pH adjusting agent adjusts the pH of the ore pulp to 9-10.
In the step (6), the mass concentration of the ore pulp is 15-25% during scavenging; the scavenging reagent system collecting agent is a combination of sodium oleate and hydroximic acid in a mass ratio of (3-5) to (1-3); the emulsifier is a combination of betaine and cocoamine in a mass ratio of (1-3) to (1-3), the pH regulator is NaOH, and the pH of the ore pulp is adjusted to 9-10; preferably, the addition amount of the collecting agent relative to the raw ore is 300-450 g/t; the addition amount of the emulsifier relative to the raw ore is 100-150 g/t.
In the steps (5) and (6), the final undersize material and the scavenged tailings are combined to be used as tailings 2.
The principle of the invention is as follows: 1) according to the structural characteristics of the failed automobile catalyst and the basic principle of crushing, the rare and precious metal coating coated on the surface of the catalyst carrier is preferentially dissociated in the crushing process, the crushed failed automobile catalyst is pre-screened, and undersize products with high platinum group metal grade are obtained, so that the subsequent reselection treatment capacity is reduced, and the design criteria of the beneficiation process capable of classifying early are met. 2) The invention provides a failure-based automobile catalyst prepared from cordierite carrier (2 MgO.2Al)2O3·5SiO2) The cordierite carrier and the gamma-alumina coating (containing platinum group metal) are separated to realize the enrichment of the platinum group metal; 3) the density of the platinum according to the invention is 21.45g/cm3The density of palladium is 12.023g/cm3The density of rhodium is 12.45g/cm3The density of the cordierite carrier is 2.56-2.66 g/cm3The density of the platinum group metal-embedded porous gamma-alumina coating is far greater than that of cordierite carrier, so that the separation of the cordierite carrier and the gamma-alumina coating (containing platinum group metal) can be realized by reselection; 4) according to the invention, the anion collector sodium oleate mainly generates physical adsorption on the cordierite carrier and the gamma-alumina coating of the spent automobile catalyst, the adsorption takes the cation center on the surface of the particle as an adsorption point, and the difference of the adsorption quantity of the anion collector on the surfaces of different substances can be caused by the difference of the number of the cation centers on the surface of the particle, so that the difference of the mineral wettability caused by different adsorbent dosages can be caused; the number of the cation centers on the surfaces of the particles of the gamma-alumina coating is large, the number of the cation centers on the surfaces of the particles of the cordierite carrier is small, and sodium oleate is in the number; the surface of the gamma-alumina coating particles is adsorbed more, the adsorption on the surface of cordierite carrier particles is less, the gamma-alumina coating particles after adsorbing the medicament are more hydrophobic than the cordierite carrier particles after adsorbing the medicament, and the two have different wettabilities, so that the gamma-alumina coating particles and the cordierite carrier particles can be separated by flotation; 5) the invention utilizes hydroximic acid to generate chemical adsorption on the surface of gamma-alumina particles without generating adsorption with cordierite carrier, and the hydroximic acid and oleic acidWhen the sodium is matched for use, the surface of the gamma-alumina particle is subjected to physical and chemical adsorption simultaneously, the adsorption is more efficient, and the adsorption of the sodium oleate on the surface of the cordierite carrier is not influenced by the hydroximic acid, so that the adsorption difference between the cordierite carrier and the gamma-alumina medicament is increased by the matched use of the hydroximic acid and the sodium oleate, namely, the difference of the wettability of the cordierite carrier and the gamma-alumina medicament is increased, and compared with a single collecting agent system, the hydroximic acid and the sodium oleate can obtain a better flotation effect by the matched use. 6) According to the invention, betaine and coconut oil amine play an emulsification role in flotation, and the betaine and the coconut oil amine can increase the dispersion degree of sodium oleate and hydroximic acid in water, so that the contact probability of a collecting agent and particles in the flotation process is increased, and the flotation is promoted to obtain a better collecting and enriching effect. 7) The content of the platinum group metals in the flotation tailings is still high, and the platinum group metals can be re-enriched through closed circuit scavenging, so that the overall recovery rate of the platinum group metals is improved.
The invention has the beneficial effects that: according to the invention, the failed automobile catalyst is treated by adopting the processes of pre-screening, closed-circuit ball milling, gravity separation, closed-circuit ball milling, flotation and scavenging according to the structural characteristics of the failed automobile catalyst, compared with the processes of fire method and wet method, the method has the advantages of less energy consumption and environmental protection, and as a method for enriching platinum group metals from the failed automobile catalyst, the recovery rate of the platinum group metals is high (85 percent), and the method is an effective method for efficiently pre-enriching the platinum group metals in the failed automobile catalyst; according to the invention, efficient novel combined reagents are adopted for flotation, the collecting agents are sodium oleate and hydroximic acid, and betaine and cocoamine are matched, so that compared with a single flotation reagent system, the flotation effect is good, and the recovery rate of platinum group metals is high; the equipment used in the invention is conventional mineral processing equipment, the process flow is simple, the production cost is low, and the industrial large-scale production is easy to realize.
Drawings
FIG. 1 is a process flow diagram of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
The invention is tested for a plurality of times in sequence, and the effect of the invention is further described and verified in detail by taking a part of test results as reference examples.
Example 1
Referring to the process flow of figure 1, taking 500g of crushed dead automobile catalyst, wherein the Pd grade is 1134g/t, and placing the crushed dead automobile catalyst into an 80-mesh sieve for pre-screening (the sieve is a circular standard sieve with the diameter of 20 cm); the oversize product enters a closed-circuit ball milling system with 80-mesh inspection and screening to be subjected to first-stage ball milling (the ball mill is a planetary ceramic ball mill); the qualified products of the first-stage ball milling enter into a gravity separation for separation (gravity separation equipment is an LYN-1100 multiplied by 500 shaking table, the stroke is 2cm, the stroke frequency is 5 times/s, the inclined plane inclination angle is 1 degree, water is used as a medium), gravity concentrate is converged with products sieved by a pre-screening sieve to enter into a closed-circuit ball milling system with 200 meshes of inspection and screening for second-stage ball milling (the ball mill is a planetary ceramic ball mill), and gravity tailings are used as tailings 1; the qualified products of the second-stage ball milling enter a 400-mesh classification system (400-mesh classification equipment is a circular standard sieve with the diameter of 20 cm), products with the particle size of more than 400 meshes enter flotation (the flotation equipment is an XFG hanging-groove inflatable flotation machine, the concentration of ore pulp is 30 percent, the pH value is 10, the dosage of flotation agents is 800g/t of sodium oleate, 400g/t of benzohydroxamic acid, 200g/t of betaine, 200g/t of cocoamine and the dosage of pH regulator is NaOH), the flotation tailings enter scavenging (the scavenging equipment is an XFG hanging-groove inflatable flotation machine, the concentration of ore pulp is 15 percent, the pH value is 10, the dosage of flotation agents is 300g/t of sodium oleate, 150g/t of benzohydroxamic acid, 75g/t of betaine, 75g/t of cocoamine and the dosage of pH regulator is NaOH), scavenging concentrates return flotation is returned to flotation, and scavenging tailings are gathered to classification operation to be used as tailings 2 with products with the particle size of less than 400 meshes; the flotation concentrate is used as the final concentrate, the yield of the concentrate is 33%, the Pd grade of the concentrate is 2908g/t, and the recovery rate of Pd reaches 85%.
Example 2
Referring to the process flow of FIG. 1, 500g of crushed dead automobile catalyst is taken, wherein the Pd grade is 1134g/t, and the crushed dead automobile catalyst is placed in an 80-mesh sieve for pre-screening (the sieve is a circular standard sieve with the diameter of 20 cm); the product on the screen enters a closed-circuit ball milling system with 80-mesh inspection and screening for primary ball milling (the ball mill is a planetary ceramic ball mill); the qualified products of the first-stage ball milling enter into a gravity separation for separation (gravity separation equipment is an LYN-1100 multiplied by 500 shaking table, the stroke is 2cm, the stroke frequency is 5 times/s, the inclined plane inclination angle is 1 degree, water is used as a medium), gravity concentrate is converged with products sieved by a pre-screening sieve to enter into a closed-circuit ball milling system with 200 meshes of inspection and screening for second-stage ball milling (the ball mill is a planetary ceramic ball mill), and gravity tailings are used as tailings 1; the qualified products of the second-stage ball milling enter a 400-mesh grading system (400-mesh grading equipment is a circular standard sieve with the diameter of 20 cm), products with the particle size of more than 400 meshes enter flotation (the flotation equipment is an XFG hanging-groove inflatable flotation machine, the concentration of ore pulp is 35 percent, the pH value is 9, the dosage of flotation agents is 1000g/t of sodium oleate, 500g/t of benzohydroxamic acid, 250g/t of betaine, 250g/t of cocoamine and the dosage of pH regulator is NaOH), the flotation tailings enter scavenging (the scavenging equipment is an XFG hanging-groove inflatable flotation machine, the concentration of ore pulp is 15 percent, the pH value is 9, the dosage of flotation agents is 300g/t of sodium oleate, 150g/t of benzohydroxamic acid, 75g/t of betaine, 75g/t of cocoamine and the dosage of pH regulator is NaOH), scavenging concentrates return flotation is carried out, and scavenging tailings are collected to be used as tailings 2 with products with the particle size of less than 400 meshes in the grading operation; and (3) flotation concentrate is used as final concentrate, the yield of the concentrate is 32%, the Pd grade of the concentrate is 2810g/t, and the recovery rate of Pd reaches 79%.
Example 3
Referring to the attached figure 1, 500g of crushed and failed automobile catalyst with the Pd grade of 1134g/t is taken and placed in an 80-mesh sieve for pre-screening (the sieve is a circular standard sieve with the diameter of 20 cm); the oversize product enters a closed-circuit ball milling system with 80-mesh inspection and screening to be subjected to first-stage ball milling (the ball mill is a planetary ceramic ball mill); the qualified products of the first-stage ball milling enter into a gravity separation for separation (gravity separation equipment is an LYN-1100 multiplied by 500 shaking table, the stroke is 2cm, the stroke frequency is 5 times/s, the inclined plane inclination angle is 1 degree, water is used as a medium), gravity concentrate is converged with products sieved by a pre-screening sieve to enter into a closed-circuit ball milling system with 200 meshes of inspection and screening for second-stage ball milling (the ball mill is a planetary ceramic ball mill), and gravity tailings are used as tailings 1; the qualified products of the second-stage ball milling enter a 400-mesh classification system (400-mesh classification equipment is a circular standard sieve with the diameter of 20 cm), products with the particle size of more than 400 meshes enter flotation (the flotation equipment is an XFG hanging-groove inflatable flotation machine, the concentration of ore pulp is 25 percent, the pH value is 10, the dosage of flotation agents is 800g/t of sodium oleate, 400g/t of benzohydroxamic acid, 200g/t of betaine, 200g/t of cocoamine and the dosage of pH regulator is NaOH), the flotation tailings enter scavenging (the scavenging equipment is an XFG hanging-groove inflatable flotation machine, the concentration of ore pulp is 15 percent, the pH value is 10, the dosage of flotation agents is 200g/t of sodium oleate, 100g/t of benzohydroxamic acid, 50g/t of betaine, 50g/t of cocoamine and the dosage of pH regulator is NaOH), scavenging concentrates return flotation is returned to flotation, and scavenging tailings are gathered to classification operation to be used as tailings 2 with products with the particle size of less than 400 meshes; the flotation concentrate is used as the final concentrate, the yield of the concentrate is 34%, the Pd grade of the concentrate is 2939g/t, and the Pd recovery rate reaches 88%.
Claims (10)
1. A method for selecting minerals enriched in platinum group metals from spent automotive catalysts comprising the steps of:
(1) pre-screening: crushing the spent automobile catalyst, and then pre-screening to obtain undersize materials and oversize materials;
(2) first-stage ball milling: performing first-stage ball milling on the oversize material obtained in the step (1), and screening after ball milling to obtain ball-milled undersize material and ball-milled oversize material;
(3) and (3) reselection: reselecting the undersize material subjected to ball milling in the step (2) to obtain reselected concentrate and reselected tailings;
(4) and (3) ball milling in the second stage: mixing the gravity concentrate obtained in the step (3) with the undersize material obtained in the step (1), and then carrying out two-stage ball milling to obtain a ball-milled material;
(5) grading: performing multi-stage classification on the ball-milled materials in the step (4) to obtain the final-stage classified materials above the sieve and the final materials below the sieve;
(6) flotation: performing flotation on the oversize material classified in the last section in the step (5), wherein flotation concentrate is a platinum group metal enriched product; and (4) scavenging the flotation tailings, and returning scavenged concentrate to the flotation process.
2. The method for concentrating platinum group metals from dead automotive catalysts according to claim 1, wherein in the step (1), the pre-screened sieve mesh number is 60-100 meshes.
3. The method for concentrating platinum group metals from dead automobile catalysts according to claim 1, wherein in the step (2), the screened mesh number is 60-100 meshes; returning the oversize material after ball milling to the first-stage ball milling.
4. The method for concentrating platinum group metals from dead automotive catalysts according to claim 1, characterized in that in the step (3), water is reselected as a reselection medium; and (4) reselecting the tailings to be used as tailings 1.
5. The method for concentrating platinum group metals from the selected dead automotive catalysts according to claim 1, wherein in the step (5), the multi-stage classification is carried out in two stages, and the mesh number of the first stage classification screen is 150-250 meshes; the mesh number of the second-stage classifying screen is 350-450 meshes; returning the oversize material after the first stage of classification to the second stage of ball milling in the step (4).
6. The method for concentrating platinum group metals from the selected dead automobile catalysts in the ore selection according to claim 1, characterized in that in the step (6), the mass concentration of the ore pulp in the flotation process is 25-35%; the flotation reagent system comprises: the collecting agent is the combination of sodium oleate and hydroximic acid; the emulsifier is the combination of betaine and cocoamine, and the pH regulator is NaOH.
7. The method for mineral enrichment of PGM from spent automotive catalysts as claimed in claim 6, wherein the mass ratio of sodium oleate to hydroximic acid is (3-5) to (1-3); the mass ratio of the betaine to the cocoamine is (1-3) to (1-3); the addition amount of the collecting agent relative to the raw ore is 1200-1500 g/t; the addition amount of the emulsifier relative to the raw ore is 400-500 g/t; the pH adjusting agent adjusts the pH of the ore pulp to 9-10.
8. The method for concentrating platinum group metals from dead automobile catalysts in mineral separation according to claim 1, characterized in that in the step (6), the mass concentration of ore pulp in scavenging is 15-25%; the scavenging reagent system collecting agent is a combination of sodium oleate and hydroximic acid in a mass ratio of (3-5) to (1-3); the emulsifier is a combination of betaine and cocoamine in a mass ratio of (1-3) to (1-3), the pH regulator is NaOH, and the pH of the ore pulp is adjusted to 9-10.
9. The method for concentrating platinum group metals from the selected ores of the spent automotive catalysts according to claim 8, wherein the addition amount of the collecting agent to raw ores is 300-450 g/t; the addition amount of the emulsifier relative to the raw ore is 100-150 g/t.
10. The process for beneficiation of platinum group metals from spent automotive catalysts according to claim 1, wherein in the steps (5) and (6), the final undersize is combined with scavenged tailings as tailings 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210280539.1A CN114618649B (en) | 2022-03-21 | 2022-03-21 | Method for selecting ore enrichment platinum group metal from spent automobile catalyst |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210280539.1A CN114618649B (en) | 2022-03-21 | 2022-03-21 | Method for selecting ore enrichment platinum group metal from spent automobile catalyst |
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| CN114618649A true CN114618649A (en) | 2022-06-14 |
| CN114618649B CN114618649B (en) | 2023-04-11 |
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| CN115106180A (en) * | 2022-07-05 | 2022-09-27 | 中南大学 | Method for selectively grinding and enriching platinum group metals from spent automobile catalyst |
| CN115739382A (en) * | 2022-11-15 | 2023-03-07 | 中南大学 | Combined process for enriching platinum group metals from spent automobile catalyst |
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| CN115106180A (en) * | 2022-07-05 | 2022-09-27 | 中南大学 | Method for selectively grinding and enriching platinum group metals from spent automobile catalyst |
| CN115106180B (en) * | 2022-07-05 | 2023-12-19 | 中南大学 | Method for selectively crushing and grinding enriched platinum group metals from spent automobile catalyst |
| CN115739382A (en) * | 2022-11-15 | 2023-03-07 | 中南大学 | Combined process for enriching platinum group metals from spent automobile catalyst |
| CN115739382B (en) * | 2022-11-15 | 2024-04-12 | 中南大学 | Combined process for enriching platinum group metals from spent automotive catalyst |
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