CN103834808A - Recycling technology of rare and precious metals in discarded automotive electronic devices - Google Patents
Recycling technology of rare and precious metals in discarded automotive electronic devices Download PDFInfo
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- CN103834808A CN103834808A CN201210478052.0A CN201210478052A CN103834808A CN 103834808 A CN103834808 A CN 103834808A CN 201210478052 A CN201210478052 A CN 201210478052A CN 103834808 A CN103834808 A CN 103834808A
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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
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Abstract
The invention relates to the treatment of electronic waste materials, and in particular relates to a recycling technology of rare and precious metals in discarded automotive electronic devices. The scheme includes the following steps: (1) disassembling discarded automotive parts; (2) breaking the discarded automotive parts containing the rare and precious metals; (3) mixing and roasting the broken powder and sodium hydroxide; (4) then washing with hot water; (5) filtering, recycling aluminum and molybdenum from the filtrate, dissolving the filter residue with an acid, and then filtering to obtain a solution containing rare earth and iron ions and a filter residue containing precious metals; (6) using the solution containing the rare earth and iron ions, which is obtained by filtration of the step (5) to prepare rare earth oxides; (7) then leaching the filter residue containing the precious metals of the step (5) with a mixed solution of hydrochloric acid and sodium hypochlorite to obtain a solution containing gold, palladium, platinum and rhodium, and then extracting the gold by electrodeposition; (8) extracting the platinum; and (9) taking a platinum-removed filtrate of the step (8) to obtain crude palladium powder. The recycling technology of the rare and precious metals in the discarded automotive electronic devices is short in process, high in obtained product purity, high in recovery rate, and environmental friendly.
Description
Technical field
The present invention relates to the processing to electronics waste and scrap, be specifically related to the recovery process of rare precious metal in a kind of abandoned car electron device.
Background technology
Along with the development of automotive engineering and the raising of people's living standard, the consumption of automobile is increasing, meanwhile, also has a large amount of automobiles to be scrapped every year, and a lot of component cannot re-use, to environment band huge negative impact.In a lot of electron devices of automobile, contain rare precious metal, if can effectively be reclaimed, can economize on resources, reduce the pollution of environment simultaneously.At present not about the report that reclaims rare precious metal technology from automobile component.
Summary of the invention
The invention provides the recovery process of rare precious metal in a kind of abandoned car electron device, is a kind of novel process of automobile component comprehensive utilization, and this technique has the features such as technical process is short, products obtained therefrom purity is high, the rate of recovery is high, environmental friendliness.
The recovery process of rare precious metal in a kind of abandoned car electron device of the present invention, its scheme comprises the following steps:
(1) disassemble: abandoned car component are disassembled, selected the component that are rich in rare precious metal;
In abandoned car, precious metal is mainly present in electron device and tai-gas clean-up catalyst etc., may contain the automobile component of rare earth element in table 1;
| Component | Rare earth element |
| Hybrid electrically motor and generator | Neodymium, praseodymium, dysprosium, terbium |
| Catalytic converter | Cerium, lanthanum |
| Nickel metal hydride battery | Lanthanum, cerium |
| Liquid crystal display | Erbium, yttrium, cerium |
| Glass polishing powder | Cerium |
| Ultraviolet ray intercepting glass | Cerium |
| Diesel fuel additive | Cerium, lanthanum |
(2) fragmentation: by the junked-auto component fragmentation containing rare precious metal, then grind whole mistake 80～150 mesh sieves; For not breakable Nd-Fe-B alloys material etc., can be aided with hydrogen broken;
(3) above-mentioned powder is mixed to roasting between 250 ℃～500 ℃, roasting time 2～4 hours according to mass ratio 1:0.8～1.5 with sodium hydroxide;
(4) then use material after the hot wash roasting of 60～99 ℃, solid-to-liquid ratio 1:3～6, agitator treating 2～4 hours;
(5) filter, reclaim aluminium, molybdenum from filtrate, the acid-soluble solution of filter residue, keeping hydrogen ion concentration in solution is 0.5～2mol/L, 60～99 ℃ of temperature of reaction, 2～4 hours reaction times, solid-to-liquid ratio 1:3～6; And then filtration obtains the solution that contains rare earth and iron ion and the filter residue that contains precious metal;
(6) solution that contains rare earth and iron ion that step (5) obtains after filtering between first regulator solution pH value to 3.5～4.5, then adds sulfide or passes into hydrogen sulfide under 20～40 ℃ of conditions, reacts 2～4 hours, and iron is precipitated completely; The solution that filtrate being contained rare earth, with rare earths such as P507 extracting and separating cerium, praseodymium, lanthanum, yttriums, then prepares rare earth oxide;
(7) leach the precious metal slag of step (5) with the mixing solutions of hydrochloric acid and clorox, obtain the solution that contains gold, palladium, platinum, rhodium, add the chloroazotic acid of 1～5 times of quality, the speed with 100～1000r/min at 20～70 ℃ of temperature stirs, and leaches 1～2.5h; Eddy flow electrodeposition gold for leach liquor, its electrodeposition condition is: temperature is 20～60 ℃, and current density is 50～400A/m2, and the electrodeposition time is 0.5～4h, and electrolytic solution pH value is 1.0～5.5, obtains electrodeposition gold, the solution after electrodeposition enters next step;
(8) extract platinum: get in step (7) liquid after electrodeposition, filter after adding saturated NH4Cl reaction 2～8h, filter residue is ammonium chloroplatinate, obtains spongy platinum after refining, except platinum filtrate enters next step:
(9) get described in step (8) except platinum filtrate, in palladium: the ratio that formic acid mass ratio is 0.5～3:1 adds formic acid, reacts 0.5～2h under 50～90 ℃ of intensively stirred conditions, and pH value is controlled at 6.0～9.0, obtains thick palladium powder.
Preferably, in step (2), component are crushed to 100～120 order powder.
The maturing temperature of step (3) is 300～400 ℃.
In step (5), solid-to-liquid ratio is 1:4～5.
PH value to 3.8～4.2 of regulator solution in step (6).
In step (7), electrodeposition condition is: temperature is 30～45 ℃, and current density is 150～250A/m2, and the electrodeposition time is 1～2.5h, and electrolytic solution pH value is 2.0～3.5.
In step (9), pH value is controlled at 6.5～8.0.
In abandoned car electron device of the present invention, its flow process of recovery process of rare precious metal is short, products obtained therefrom purity is high, the rate of recovery is high, environmental friendliness.
Embodiment
Below in conjunction with specific embodiment, the present invention is further illustrated, but protection scope of the present invention is not limited to these embodiment.
embodiment mono-
The recovery process of rare precious metal in abandoned car electron device, concrete steps are as follows:
(1) disassemble: abandoned car component are disassembled, selected the component that are rich in rare precious metal, the metallic carrier of for example automobile exhaust purifier, starting engine, generator, speed change gear, vaporizer, air-conditioning part etc.;
(2) fragmentation: by the powerful Mechanical Crushing of junked-auto component containing rare precious metal, then grind whole mistake 80 mesh sieves; For not breakable Nd-Fe-B alloys material etc., can be aided with hydrogen broken;
(3) above-mentioned powder is mixed to roasting between 250 ℃, roasting time 4 hours according to mass ratio 1:0.8 with sodium hydroxide;
(4) with material after the hot wash roasting of 60 ℃, solid-to-liquid ratio 1:3, agitator treating 2 hours;
(5) filter, reclaim aluminium, molybdenum etc. from filtrate, the acid-soluble solution of filter residue, in order to dissolve the metallic element such as rare earth element and iron, keeping hydrogen ion concentration in solution is 0.5mol/L, 60 ℃ of temperature of reaction, 4 hours reaction times, solid-to-liquid ratio 1:3; And then filtration obtains the solution that contains rare earth and iron ion and the filter residue that contains precious metal;
(6) solution that contains rare earth and iron ion that step (5) obtains after filtering, first regulator solution pH value to 3.5 then passes into hydrogen sulfide under 20 ℃ of conditions, reacts 4 hours, and iron is precipitated completely; The solution that filtrate being contained rare earth, with rare earths such as P507 extracting and separating cerium, praseodymium, lanthanum, yttriums, then prepares rare earth oxide;
(7) leach the precious metal slag of step (5) with the mixing solutions of hydrochloric acid and clorox, obtain the solution that contains gold, palladium, platinum, rhodium, add the chloroazotic acid of 5 times of quality, the speed with 1000r/min at 20 ℃ of temperature stirs, and leaches 1h; Eddy flow electrodeposition gold for leach liquor, its electrodeposition condition is: temperature is 20 ℃, current density is 50A/m
2, the electrodeposition time is 4h, and electrolytic solution pH value is 5.5, obtains electrodeposition gold, and after electrodeposition, liquid enters next step;
(8) extract platinum: get in step (7) liquid after electrodeposition, add saturated NH
4after Cl reaction 8h, filter, filter residue is ammonium chloroplatinate, obtains spongy platinum after refining, except platinum filtrate enters next step:
(9) get described in step (8) except platinum filtrate, in palladium: the ratio that formic acid mass ratio is 0.5:1 adds formic acid, reacts 2h under 50 ℃ of intensively stirred conditions, and pH value is controlled at 6.0, obtains thick palladium powder.
embodiment bis-
The recovery process of rare precious metal in abandoned car electron device, concrete steps are as follows:
(1) disassemble: abandoned car component are disassembled, selected the component that are rich in rare precious metal, the metallic carrier of for example automobile exhaust purifier, starting engine, generator, speed change gear, vaporizer, air-conditioning part etc.;
(2) fragmentation: by the powerful Mechanical Crushing of junked-auto component containing rare precious metal, then grind whole mistake 150 mesh sieves; For not breakable Nd-Fe-B alloys material etc., can be aided with hydrogen broken;
(3) above-mentioned powder is mixed to roasting between 500 ℃, roasting time 2 hours according to mass ratio 1:1.5 with sodium hydroxide;
(4) with material after the hot wash roasting of 99 ℃, solid-to-liquid ratio 1:6, agitator treating 4 hours;
(5) filter, reclaim aluminium, molybdenum etc. from filtrate, the acid-soluble solution of filter residue, in order to dissolve the metallic element such as rare earth element and iron, keeping hydrogen ion concentration in solution is 2mol/L, 99 ℃ of temperature of reaction, 2 hours reaction times, solid-to-liquid ratio 1:3; And then filtration obtains the solution that contains rare earth and iron ion and the filter residue that contains precious metal;
(6) solution that contains rare earth and iron ion that step (5) obtains after filtering, first regulator solution pH value to 4.5 then passes into hydrogen sulfide under 40 ℃ of conditions, reacts 2 hours, and iron is precipitated completely; The solution that filtrate being contained rare earth, with rare earths such as P507 extracting and separating cerium, praseodymium, lanthanum, yttriums, then prepares rare earth oxide;
(7) leach the precious metal slag of step (5) with the mixing solutions of hydrochloric acid and clorox, obtain the solution that contains gold, palladium, platinum, rhodium, add the chloroazotic acid of equal quality, the speed with 100r/min at 70 ℃ of temperature stirs, and leaches 2.5h; Eddy flow electrodeposition gold for leach liquor, its electrodeposition condition is: temperature is 60 ℃, and current density is 400A/m2, and the electrodeposition time is 0.5h, and electrolytic solution pH value is 1.0, obtains electrodeposition gold, after electrodeposition, liquid enters next step;
(8) extract platinum: get in step (7) liquid after electrodeposition, filter after adding saturated NH4Cl reaction 8h, filter residue is ammonium chloroplatinate, obtains spongy platinum after refining, except platinum filtrate enters next step:
(9) get described in step (8) except platinum filtrate, in palladium: the ratio that formic acid mass ratio is 0.5～3:1 adds formic acid, reacts 0.5h under 90 ℃ of intensively stirred conditions, and pH value is controlled at 9.0, obtains thick palladium powder.
The concentration and separation of step (6) rare earth, obtains more than 95% lucium, then obtains more than 99.95% single pure rare earth muriate through solvent extraction, finally obtains ultra-pure single rare earth oxide compound by stratography.Wherein, the purity of europium sesquioxide, yttrium oxide reaches 99.995%-99.9995%.Rare earth total yield is greater than 90%, and non-rare earth yield is greater than 85%.
embodiment tri-
The recovery process of rare precious metal in abandoned car electron device, concrete steps are as follows:
(1) disassemble: abandoned car component are disassembled, selected the component that are rich in rare precious metal, the metallic carrier of for example automobile exhaust purifier, starting engine, generator, speed change gear, vaporizer, air-conditioning part etc.;
(2) fragmentation: by the powerful Mechanical Crushing of junked-auto component containing rare precious metal, then grind whole mistake 100 mesh sieves; For not breakable Nd-Fe-B alloys material etc., can be aided with hydrogen broken;
(3) above-mentioned powder is mixed to roasting between 300 ℃, roasting time 3 hours according to mass ratio 1:1.2 with sodium hydroxide;
(4) with material after the hot wash roasting of 89 ℃, solid-to-liquid ratio 1:4, agitator treating 3 hours;
(5) filter, reclaim aluminium, molybdenum etc. from filtrate, the acid-soluble solution of filter residue, in order to dissolve the metallic element such as rare earth element and iron, keeping hydrogen ion concentration in solution is 1.0mol/L, 75 ℃ of temperature of reaction, 3.5 hours reaction times, solid-to-liquid ratio 1:4; And then filtration obtains the solution that contains rare earth and iron ion and the filter residue that contains precious metal;
(6) solution that contains rare earth and iron ion that step (5) obtains after filtering between first regulator solution pH value to 3.8, then adds sulfide under 30 ℃ of conditions, reacts 3.2 hours, and iron is precipitated completely; The solution that filtrate being contained rare earth, with rare earths such as P507 extracting and separating cerium, praseodymium, lanthanum, yttriums, then prepares rare earth oxide;
(7) leach the precious metal slag of step (5) with the mixing solutions of hydrochloric acid and clorox, obtain the solution that contains gold, palladium, platinum, rhodium, add the chloroazotic acid of 3 times of quality, the speed with 500r/min at 50 ℃ of temperature stirs, and leaches 2h; Eddy flow electrodeposition gold for leach liquor, its electrodeposition condition is: temperature is 30 ℃, and current density is 150A/m2, and the electrodeposition time is 1h, and electrolytic solution pH value is 2.0, obtains electrodeposition gold, after electrodeposition, liquid enters next step;
(8) extract platinum: get in step (7) liquid after electrodeposition, filter after adding saturated NH4Cl reaction 5h, filter residue is ammonium chloroplatinate, obtains spongy platinum after refining, except platinum filtrate enters next step:
(9) get described in step (8) except platinum filtrate, in palladium: the ratio that formic acid mass ratio is 2:1 adds formic acid, reacts 1.5h under 70 ℃ of intensively stirred conditions, and pH value is controlled at 6.5, obtains thick palladium powder.
embodiment tetra-
The recovery process of rare precious metal in abandoned car electron device, concrete steps are as follows:
(1) disassemble: abandoned car component are disassembled, selected the component that are rich in rare precious metal, the metallic carrier of for example automobile exhaust purifier, starting engine, generator, speed change gear, vaporizer, air-conditioning part etc.;
(2) fragmentation: by the powerful Mechanical Crushing of junked-auto component containing rare precious metal, then grind whole mistake 120 mesh sieves; For not breakable Nd-Fe-B alloys material etc., can be aided with hydrogen broken;
(3) above-mentioned powder is mixed to roasting between 400 ℃, roasting time 2.5 hours according to mass ratio 1:1 with sodium hydroxide;
(4) with material after the hot wash roasting of 78 ℃, solid-to-liquid ratio 1:5, agitator treating 2.5 hours;
(5) filter, reclaim aluminium, molybdenum etc. from filtrate, the acid-soluble solution of filter residue, in order to dissolve the metallic element such as rare earth element and iron, keeping hydrogen ion concentration in solution is 1.8mol/L, 85 ℃ of temperature of reaction, 2 hours reaction times, solid-to-liquid ratio 1:5; And then filtration obtains the solution that contains rare earth and iron ion and the filter residue that contains precious metal;
(6) solution that contains rare earth and iron ion that step (5) obtains after filtering, first regulator solution pH value to 4.2 then passes into hydrogen sulfide under 28 ℃ of conditions, reacts 4 hours, and iron is precipitated completely; The solution that filtrate being contained rare earth, with rare earths such as P507 extracting and separating cerium, praseodymium, lanthanum, yttriums, then prepares rare earth oxide;
(7) leach the precious metal slag of step (5) with the mixing solutions of hydrochloric acid and clorox, obtain the solution that contains gold, palladium, platinum, rhodium, add the chloroazotic acid of 4 times of quality, the speed with 700r/min at 60 ℃ of temperature stirs, and leaches 2h; Eddy flow electrodeposition gold for leach liquor, its electrodeposition condition is: temperature is 45 ℃, and current density is 250A/m2, and the electrodeposition time is 1h, and electrolytic solution pH value is 3.5, obtains electrodeposition gold, after electrodeposition, liquid enters next step;
(8) extract platinum: get in step (7) liquid after electrodeposition, filter after adding saturated NH4Cl reaction 7h, filter residue is ammonium chloroplatinate, obtains spongy platinum after refining, except platinum filtrate enters next step:
(9) get described in step (8) except platinum filtrate, in palladium: the ratio that formic acid mass ratio is 2:1 adds formic acid, reacts 1h under 65 ℃ of intensively stirred conditions, and pH value is controlled at 8.0, obtains thick palladium powder.
embodiment five
The recovery process of rare precious metal in abandoned car electron device, concrete steps are as follows:
(1) disassemble: abandoned car component are disassembled, selected the component that are rich in rare precious metal, the metallic carrier of for example automobile exhaust purifier, starting engine, generator, speed change gear, vaporizer, air-conditioning part etc.;
(2) fragmentation: by the powerful Mechanical Crushing of junked-auto component containing rare precious metal, then grind whole mistake 110 mesh sieves; For not breakable Nd-Fe-B alloys material etc., can be aided with hydrogen broken;
(3) above-mentioned powder is mixed to roasting between 450 ℃, roasting time 3 hours according to mass ratio 1:0.9 with sodium hydroxide;
(4) with material after the hot wash roasting of 75 ℃, solid-to-liquid ratio 1:4, agitator treating 3 hours;
(5) filter, reclaim aluminium, molybdenum etc. from filtrate, the acid-soluble solution of filter residue, in order to dissolve the metallic element such as rare earth element and iron, keeping hydrogen ion concentration in solution is 1.5mol/L, 75 ℃ of temperature of reaction, 3 hours reaction times, solid-to-liquid ratio 1:5; And then filtration obtains the solution that contains rare earth and iron ion and the filter residue that contains precious metal;
(6) solution that contains rare earth and iron ion that step (5) obtains after filtering, first regulator solution pH value to 3.5 then adds sulfide or passes into hydrogen sulfide under 35 ℃ of conditions, reacts 3 hours, and iron is precipitated completely; The solution that filtrate being contained rare earth, with rare earths such as P507 extracting and separating cerium, praseodymium, lanthanum, yttriums, then prepares rare earth oxide;
(7) leach the precious metal slag of step (5) with the mixing solutions of hydrochloric acid and clorox, obtain the solution that contains gold, palladium, platinum, rhodium, add the chloroazotic acid of 3 times of quality, the speed with 800r/min at 40 ℃ of temperature stirs, and leaches 2h; Eddy flow electrodeposition gold for leach liquor, its electrodeposition condition is: temperature is 35 ℃, and current density is 300A/m2, and the electrodeposition time is 1h, and electrolytic solution pH value is 2.5, obtains electrodeposition gold, after electrodeposition, liquid enters next step;
(8) extract platinum: get in step (7) liquid after electrodeposition, filter after adding saturated NH4Cl reaction 5h, filter residue is ammonium chloroplatinate, obtains spongy platinum after refining, except platinum filtrate enters next step:
(9) get described in step (8) except platinum filtrate, in palladium: the ratio that formic acid mass ratio is 2:1 adds formic acid, reacts 2h under 70 ℃ of intensively stirred conditions, and pH value is controlled at 7.0, obtains thick palladium powder.
Above-described embodiment is preferably embodiment of the present invention; but embodiments of the present invention are not restricted to the described embodiments; other any do not deviate from change, the modification done under spirit of the present invention and principle, substitutes, combination, simplify; all should be equivalent substitute mode, within being included in protection scope of the present invention.
Claims (7)
1. a recovery process for rare precious metal in abandoned car electron device, is characterized in that, comprises the following steps:
(1) disassemble: abandoned car component are disassembled, selected the component that are rich in rare precious metal;
(2) fragmentation: by the junked-auto component fragmentation containing rare precious metal, then grind whole mistake 80～150 mesh sieves;
(3) above-mentioned powder is mixed to roasting between 250 ℃～500 ℃, roasting time 2～4 hours according to mass ratio 1:0.8～1.5 with sodium hydroxide;
(4) then use material after the hot wash roasting of 60～99 ℃, solid-to-liquid ratio 1:3～6, agitator treating 2～4 hours;
(5) filter, reclaim aluminium, molybdenum from filtrate, the acid-soluble solution of filter residue, keeping hydrogen ion concentration in solution is 0.5～2mol/L, 60～99 ℃ of temperature of reaction, 2～4 hours reaction times, solid-to-liquid ratio 1:3～6; And then filtration obtains the solution that contains rare earth and iron ion and the filter residue that contains precious metal;
(6) solution that contains rare earth and iron ion that step (5) obtains after filtering between first regulator solution pH value to 3.5～4.5, then adds sulfide or passes into hydrogen sulfide under 20～40 ℃ of conditions, reacts 2～4 hours, and iron is precipitated completely; The solution that filtrate being contained rare earth, with rare earths such as P507 extracting and separating cerium, praseodymium, lanthanum, yttriums, then prepares rare earth oxide;
(7) leach the precious metal slag of step (5) with the mixing solutions of hydrochloric acid and clorox, obtain the solution that contains gold, palladium, platinum, rhodium, add the chloroazotic acid of 1～5 times of quality, the speed with 100～1000r/min at 20～70 ℃ of temperature stirs, and leaches 1～2.5h; Eddy flow electrodeposition gold for leach liquor, its electrodeposition condition is: temperature is 20～60 ℃, and current density is 50～400A/m2, and the electrodeposition time is 0.5～4h, and electrolytic solution pH value is 1.0～5.5, obtains electrodeposition gold, the solution after electrodeposition enters next step;
(8) extract platinum: get in step (7) liquid after electrodeposition, filter after adding saturated NH4Cl reaction 2～8h, filter residue is ammonium chloroplatinate, obtains spongy platinum after refining, except platinum filtrate enters next step:
(9) get described in step (8) except platinum filtrate, in palladium: the ratio that formic acid mass ratio is 0.5～3:1 adds formic acid, reacts 0.5～2h under 50～90 ℃ of intensively stirred conditions, and pH value is controlled at 6.0～9.0, obtains thick palladium powder.
2. the recovery process of rare precious metal in abandoned car electron device according to claim 1, is characterized in that, in step (2), component is crushed to 100～120 order powder.
3. the recovery process of rare precious metal in abandoned car electron device according to claim 1, is characterized in that, the maturing temperature of step (3) is 300～400 ℃.
4. the recovery process of rare precious metal in abandoned car electron device according to claim 1, is characterized in that, in step (5), solid-to-liquid ratio is 1:4～5.
5. the recovery process of rare precious metal in abandoned car electron device according to claim 1, is characterized in that pH value to 3.8～4.2 of regulator solution in step (6).
6. the recovery process of rare precious metal in abandoned car electron device according to claim 1, it is characterized in that, in step (7), electrodeposition condition is: temperature is 30～45 ℃, and current density is 150～250A/m2, the electrodeposition time is 1～2.5h, and electrolytic solution pH value is 2.0～3.5.
7. the recovery process of rare precious metal in abandoned car electron device according to claim 1, is characterized in that, in step (9), pH value is controlled at 6.5～8.0.
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| CN112899478A (en) * | 2021-01-13 | 2021-06-04 | 深圳市正力实业有限公司 | Device and method for efficiently purifying precious metals in waste automobile exhaust catalyst |
| CN114107690A (en) * | 2021-10-26 | 2022-03-01 | 安徽元琛环保科技股份有限公司 | Method for extracting noble metal of three-way catalyst |
| EP4265757A1 (en) | 2022-04-22 | 2023-10-25 | Institute of Process Engineering, Chinese Academy of Sciences | Method for clean recovery of palladium |
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| GB2579685B (en) * | 2018-12-07 | 2021-12-29 | Tripod Nano Tech Corporation | Method of making an inorganic platinum compound |
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| CN112899478A (en) * | 2021-01-13 | 2021-06-04 | 深圳市正力实业有限公司 | Device and method for efficiently purifying precious metals in waste automobile exhaust catalyst |
| CN114107690A (en) * | 2021-10-26 | 2022-03-01 | 安徽元琛环保科技股份有限公司 | Method for extracting noble metal of three-way catalyst |
| EP4265757A1 (en) | 2022-04-22 | 2023-10-25 | Institute of Process Engineering, Chinese Academy of Sciences | Method for clean recovery of palladium |
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