CN108315564A - The method that a kind of molten carrier recycles platinum from aluminium-based catalyst - Google Patents
The method that a kind of molten carrier recycles platinum from aluminium-based catalyst Download PDFInfo
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Abstract
The present invention relates to a kind of methods that platinum is recycled in platinum catalyst from aluminium base, take selective dissolution alumina-based support, and recycling platinum is redissolved from a small amount of insoluble slag.Process route is as follows：The precipitation and reduction → spongy platinum product of organic matter → inorganic acid oxidation dissolution platinum → platinum are gone in selective dissolution alumina-based support → precipitate reduction → clarification filtration → calcining.This method does not roast catalyst raw material, and only roasts remaining a small amount of insoluble slag after carrier dissolving, and energy consumption substantially reduces.Technique is brief, and reagent consumption is few, and cost recovery is low.The recycling of platinum will not delay backward, and recycling promptness is good.The platinum rate of recovery reaches 98.2%, spongy platinum purity >=99.95%.
Description
Technical field
The invention belongs to recycling fields, and in particular to a kind of molten carrier recycles the side of platinum from aluminium-based catalyst
Method.
Background technology
Platinum group metal, resource scarcity, the content in the earth's crust only have 0.001-0.01g/t (Pt 0.005g/t), price
Costliness also has and its important use in addition to extremely important economic value in modern science and technology and industrial development process
On the way.Platinum group metal has excellent catalytic performance.In chemical industry, especially in petro chemical industry, oil-refinery industry, doctor
In medicine and energy industry, the catalyst of platinum group metal such as platinum, palladium is widely used.For platinum, petrochemical industry (reform and
Catalytic pyrolysis), chemical fertilizer industry (synthetic ammonia catalyst) and eliminate the fields such as automobile exhaust pollution and be widely used.In addition, electronics,
The fields such as glass ceramics and military project also have highly important purposes.China platinum group metal lacks, and foreign exchange need to be spent from state every year
Outer import platinum group metal meets the needs of the development of the national economy.Thus, platinum group metal is recycled in continuous improvement from dead catalyst
Engineering and industrialization level, be particularly important.
Platinum is recycled from dead catalyst, there are two kinds of process routes of pyrogenic process and wet method, practical application is based on wet method.It detaches pure
Change platinum group metal, the classical precipitation method still account for critical role, and shortcoming is that flow is complicated tediously long, and metal recovery rate is low；It is molten
Also there are many researchs and report in agent extraction and Strong acid ion-exchanger purifying platinum group metal, but in commercial Application, really effectively and
Excellent extractant and ion exchange resin is few.Domestic current solvent extraction technology, operational effect are not sufficiently stable, product quality
Also unstable, cost is higher, and operating environment is poor.
Wet recycling process is broadly divided into the carrier molten platinum method of the insoluble selectivity of molten resin adsorption method, carrier and only molten carrier entirely
Platinum enters slag absorption method.Complete molten-resin adsorption method the technique of carrier and platinum, the leaching rate of platinum is higher, but resin expense and eluent at
This is higher, and remains a part of platinum on resin and cannot recycle in time.The molten platinum of the insoluble selectivity of carrier, needing will be after carrier calcination
Fine grinding, since carrier is insoluble, the quantity of slag is big, and the leaching rate of platinum is slightly lower.
Invention content
The purpose of the present invention is to provide a kind of from the platinum-containing waste catalyst that carrier is aluminium oxide, selective dissolution selection
Property dissolving carrier, platinum is insoluble and enters in slag, insoluble slag is fired remove carbon remover and organic matter after, dissolving recycling platinum.
Technical scheme is as follows：The method that a kind of molten carrier recycles platinum from aluminium-based catalyst, including it is following
Step：
S1：Platinum-containing waste catalyst is subjected to carrier dissolving, the reagent used is the concentrated sulfuric acid, and sulfuric acid dosage is platinum dead catalyst
2~8 times, water addition is 3~10 times of raw material weight, and reaction temperature is 80~120 DEG C, and the reaction time is 2~8h；
S2：Reducing agent is added to restore a small amount of platinum being dissolved into solution；
S3：Clarification and solid-liquor separation are carried out, the solution in S2 is diluted with water, the volume after dilution reaches platinum dead catalyst
30~80 times, after mixing stand clarification, after draining supernatant, bottom underflow is filtered to obtain platiniferous slag；
S4：Platiniferous slag is calcined to go carbon remover and organic matter, 500~1000 DEG C of calcination temperature；
S5：By the calcining slag of S4 carry out dissolving platinum operation, agents useful for same be hydrochloric acid and oxidant, liquid-solid ratio be 2/1~
10/1, hydrochloric acid initial acidity is 1~10mol/L, and oxidant is nitric acid or sodium chlorate；
S6：It is slowly added to solid ammonium chloride in platiniferous solution into S5, generates ammonium chloroplatinate precipitate, filtering is used in combination
The ammonium chloride solution of 50g/L washs ammonium chloroplatinate precipitate；Ammonium chloroplatinate precipitate is sized mixing with hot water, reducing agent hydrazine hydrate is added also
Original obtains spongy platinum crude product；
S7：Spongy platinum crude product aqua regia dissolution in S6 and after catching up with nitre, is added sodium salt and platinum is complexed, addition is 20~
200g/L；Then sodium hydroxide solution is added and adjusts pH value to 7~10, impurity enters precipitation, then filters out contamination precipitation object；
S8：The sodium salt complex solution of platinum in S7 analyzes pure salt and adjusts pH value to 1~3, is added and analyzes pure solid chlorine
Ammonium platinum precipitation, ammonium chloride dosage are 1~5 times of theoretical amount；Spongy platinum product, calcining is made in ammonium chloroplatinate precipitate object calcining and decomposing
Decomposition temperature is 500~1000 DEG C, and the time is 1~10h.
In the S2, the one or more such as glucose, hydrazine hydrate, formic acid, sodium borohydride, iron powder, zinc powder, vulcanized sodium are added
Reducing agent or precipitating reagent.
In the S5, using nitric acid be oxidant when, nitric acid initial acidity be 1~5mol/L；The use of sodium chlorate is oxidation
When agent, sodium chlorate beginning a concentration of 10~50g/L, temperature is 40 DEG C~100 DEG C, and the reaction time is 2~8h；It controls after reaction
Residual acidity is 0.2~1mol/L；
In the S6, hydrazine hydrate dosage is 1~5 times of theoretical amount, and reduction temperature is 50~100 DEG C, and the time is 1~5h.
In the S7, sodium salt used is sodium chloride or sodium sulphate or sodium nitrite.
In the S2, precipitating reagent is added, a small amount of platinum being dissolved into solution precipitates.
The remarkable result of the present invention is：
1, the method for taking preferential dissolving carrier, eliminates the pretreatment operation for burning carbon distribution and organic matter, saves operation
Link and processing cost.
2, platinum enters in insoluble slag after carrier dissolving, and platinum can be enriched with 10~20 times, can after burning organic matter aqua regia dissolution
Directly plus chloride precipitation goes out ammonium chloroplatinate, and ammonium chloroplatinate is through restoring or calcining obtained spongy platinum.Simple flow is short, and equipment is simple,
Platinum product can be obtained in time by feeding intake per a batch, will not cause to delay overstocked.
Specific implementation mode
According to operating procedure disclosed by the invention and there are related parameter, those skilled in the art can be according to the operation of this method
Principle achieves the object of the present invention, and is not limited to using the equipment itself and its occupation mode used in specific implementation mode.
The following describes the present invention in detail with reference to examples.
Embodiment 1
The method that a kind of molten carrier recycles platinum from aluminium-based catalyst, includes the following steps：
S1：Platinum-containing waste catalyst is subjected to carrier dissolving, the reagent used is the concentrated sulfuric acid, and concentrated sulfuric acid dosage, which is that platiniferous is useless, urges
2~8 times of agent, water addition are 3~10 times of platinum-containing waste catalyst raw material weight, and reaction temperature is 80~120 DEG C, reaction
Time is 2~8h；
S2：Reducing agent or precipitating reagent is added a small amount of platinum being dissolved into solution is restored or precipitated；
S3：Clarification and solid-liquor separation are carried out, the solution in S2 is diluted with water, the volume after dilution reaches the useless catalysis of platiniferous
30~80 times of agent raw material stand clarification after mixing, after draining supernatant, bottom underflow is filtered to obtain platiniferous slag；
S4：Platiniferous slag is calcined to go carbon remover and organic matter, 500~1000 DEG C of calcination temperature；
S5：By the calcining slag of S4 carry out dissolving platinum operation, agents useful for same be hydrochloric acid and oxidant, liquid-solid ratio be 2/1~
10/1, hydrochloric acid initial acidity is 1~10mol/L, and oxidant is nitric acid or sodium chlorate；Using nitric acid be oxidant when, nitric acid rise
Beginning acidity is 1~5mol/L, and when the use of sodium chlorate being oxidant, sodium chlorate begins a concentration of 10~50g/L, temperature is 40 DEG C~
100 DEG C, the reaction time is 2~8h；Control residual acidity is 0.2~1mol/L after reaction；
S6：It is slowly added to solid ammonium chloride in platiniferous solution into S5, generates ammonium chloroplatinate precipitate, filtering is used in combination
The ammonium chloride solution of 50g/L washs ammonium chloroplatinate precipitate；Ammonium chloroplatinate precipitate is sized mixing with hot water, reducing agent hydrazine hydrate is added also
Original obtains spongy platinum crude product；Hydrazine hydrate dosage is 1~5 times of theoretical amount, and reduction temperature is 50~100 DEG C, the time is 1~
5h；
S7：Spongy platinum crude product aqua regia dissolution in S6 and after catching up with nitre, is added sodium salt and platinum is complexed, sodium salt used is chlorination
Sodium, sodium sulphate, sodium nitrite, addition are 20~200g/L；Then addition sodium hydroxide solution adjustment pH value is miscellaneous to 7~10
Matter enters precipitation, then filters out contamination precipitation object；
S8：The sodium salt complex solution of platinum in S7 analyzes pure salt and adjusts pH value to 1~3, is added and analyzes pure solid chlorine
Ammonium platinum precipitation, ammonium chloride dosage are 1~5 times of theoretical amount；Spongy platinum product, calcining is made in ammonium chloroplatinate precipitate object calcining and decomposing
Decomposition temperature is 500~1000 DEG C, and the time is 1~10h
In the S2, the one or more such as glucose, hydrazine hydrate, formic acid, sodium borohydride, iron powder, zinc powder, vulcanized sodium are added
Reducing agent or precipitating reagent.
Embodiment 2
Pt-Al containing Pt0.28%2O33 liters of water, dense sulphur is added in 10 liters of glass reactor in dead catalyst 1000g
2 liters of acid, 100 degree of temperature react 3 liters of moisturizing after 4h, and hydrazine hydrate 10ml is added, and are discharged in 40 liters of plastic barrel after reacting 2h,
And it is diluted with water 40 liters of total volume, supernatant is discharged in standing afterwards for 24 hours, and 6h is roasted at 700 DEG C after the filtering of bottom underflow.It will burn
The dissolving that 50ml water, 100ml hydrochloric acid, 5g sodium chlorate carry out platinum, 90 DEG C of temperature, filtering is added in good slag.It is added into leachate
20g ammonium chlorides are placed into second day and filter, and the ammonium chloride solution of 50g/L is used in combination to wash ammonium chloroplatinate precipitate.Ammonium chloroplatinate is used
Pure water slurrying is heated to 80 DEG C, and hydrazine hydrate reduction is added and obtains thick spongy platinum 2.8g.
Thick spongy platinum is added 50ml water, 50ml hydrochloric acid, 15ml nitric acid and is dissolved, and catches up with after nitre constant volume to 100ml.Chlorine is added
Change sodium 10g and platinum is complexed, then uses the sodium hydroxide solution of 100g/L to adjust pH value to 7~10, then filter out contamination precipitation object.
Pure salt is analyzed with 2mol/L again and adjust pH value to 1~3, be added and analyze pure solid ammonium chloride 10g platinum precipitations.Ammonium chloroplatinate filters simultaneously
4h is calcined after washing at 800 DEG C.It is final to obtain product spongy platinum 2.71g, also contain 0.04g platinum in ammonium chloroplatinate precipitate mother liquor,
The overall recovery of platinum is 98.2%, and spongy platinum purity is more than 99.95%.
Embodiment 3
Pt-Al containing Pt0.28%2O37 liters of water, dense sulphur is added in 20 liters of glass reactor in dead catalyst 2000g
4.5 liters of acid, 100 degree of temperature react 7 liters of moisturizing after 4h, and vulcanized sodium 10g is added, 100 liters of plastic barrel is discharged to after reaction 2h
In, and it is diluted with water 100 liters of total volume, supernatant is discharged in standing afterwards for 24 hours, and 6h is roasted at 700 DEG C after the filtering of bottom underflow.
The dissolving that 100ml water, 300ml hydrochloric acid, 60ml nitric acid carry out platinum is added in burned slag, 90 DEG C of temperature filters after reacting 4h, to
50g ammonium chlorides are added in leachate, is placed into second day and filters, the ammonium chloride solution of 50g/L is used in combination to wash ammonium chloroplatinate precipitate.
Ammonium chloroplatinate is calcined into 6h at 700 DEG C and obtains spongy platinum 5.49g.
Thick spongy platinum is added 100ml water, 60ml hydrochloric acid, 30ml nitric acid and is dissolved, and catches up with after nitre constant volume to 200ml.It is added
Platinum is complexed in sodium nitrite 25g, then uses the sodium hydroxide solution of 100g/L to adjust pH value to 7~10, filters out contamination precipitation object.
Pure salt is analyzed with 2mol/L again and adjust pH value to 1~3, be added and analyze pure solid ammonium chloride 25g platinum precipitations.Ammonium chloroplatinate filters simultaneously
4h is calcined after washing at 800 DEG C.It is final to obtain product spongy platinum 5.40g, also contain 0.05g platinum in ammonium chloroplatinate precipitate mother liquor,
The overall recovery of platinum is 98.2%, and spongy platinum purity is more than 99.95%.
Embodiment 4
The method that a kind of molten carrier recycles platinum from aluminium-based catalyst, includes the following steps：
S1：Platinum-containing waste catalyst is subjected to carrier dissolving, the reagent used is the concentrated sulfuric acid, and sulfuric acid dosage is platinum dead catalyst
2 times, water addition is 3 times of raw material weight, and reaction temperature is 80 DEG C, reaction time 2h；
S2：Reducing agent is added to restore a small amount of platinum being dissolved into solution；
S3：Clarification and solid-liquor separation are carried out, the solution in S2 is diluted with water, the volume after dilution reaches platinum dead catalyst
30 times, after mixing stand clarification, after draining supernatant, bottom underflow is filtered to obtain platiniferous slag；
S4：Platiniferous slag is calcined to go carbon remover and organic matter, 500 DEG C of calcination temperature；
S5：The calcining slag of S4 is carried out to the operation of dissolving platinum, agents useful for same is hydrochloric acid and oxidant, liquid-solid ratio 2/1, salt
Sour initial acidity is 1mol/L, and oxidant is nitric acid or sodium chlorate；
S6：It is slowly added to solid ammonium chloride in platiniferous solution into S5, generates ammonium chloroplatinate precipitate, filtering is used in combination
The ammonium chloride solution of 50g/L washs ammonium chloroplatinate precipitate；Ammonium chloroplatinate precipitate is sized mixing with hot water, reducing agent hydrazine hydrate is added also
Original obtains spongy platinum crude product；
S7：Spongy platinum crude product aqua regia dissolution in S6 and after catching up with nitre, is added sodium salt and platinum is complexed, addition 20g/
L；Then sodium hydroxide solution is added and adjusts pH value to 7, impurity enters precipitation, then filters out contamination precipitation object；
S8：The sodium salt complex solution of platinum in S7 analyzes pure salt and adjusts pH value to 1, is added and analyzes pure solid chlorine ammonia-sinking
Shallow lake platinum, ammonium chloride dosage are 1 times of theoretical amount；Spongy platinum product, calcining and decomposing temperature is made in ammonium chloroplatinate precipitate object calcining and decomposing
Degree is 500 DEG C, time 1h.
In the S2, the one or more such as glucose, hydrazine hydrate, formic acid, sodium borohydride, iron powder, zinc powder, vulcanized sodium are added
Reducing agent or precipitating reagent.
In the S5, using nitric acid be oxidant when, nitric acid initial acidity be 1mol/L；The use of sodium chlorate is oxidant
When, sodium chlorate beginning a concentration of 10g/L, temperature is 40 DEG C, reaction time 2h；Control residual acidity is after reaction
0.2mol/L；
In the S6, hydrazine hydrate dosage is 1 times of theoretical amount, and reduction temperature is 50 DEG C, time 1h.
In the S7, sodium salt used is sodium chloride or sodium sulphate or sodium nitrite.
In the S2, precipitating reagent is added, a small amount of platinum being dissolved into solution precipitates.
Embodiment 5
The method that a kind of molten carrier recycles platinum from aluminium-based catalyst, includes the following steps：
S1：Platinum-containing waste catalyst is subjected to carrier dissolving, the reagent used is the concentrated sulfuric acid, and sulfuric acid dosage is platinum dead catalyst
8 times, water addition is 10 times of raw material weight, and reaction temperature is 120 DEG C, reaction time 8h；
S2：Reducing agent is added to restore a small amount of platinum being dissolved into solution；
S3：Clarification and solid-liquor separation are carried out, the solution in S2 is diluted with water, the volume after dilution reaches platinum dead catalyst
80 times, after mixing stand clarification, after draining supernatant, bottom underflow is filtered to obtain platiniferous slag；
S4：Platiniferous slag is calcined to go carbon remover and organic matter, 1000 DEG C of calcination temperature；
S5：By the calcining slag of S4 carry out dissolving platinum operation, agents useful for same be hydrochloric acid and oxidant, liquid-solid ratio 10/1,
Hydrochloric acid initial acidity is 10mol/L, and oxidant is nitric acid or sodium chlorate；
S6：It is slowly added to solid ammonium chloride in platiniferous solution into S5, generates ammonium chloroplatinate precipitate, filtering is used in combination
The ammonium chloride solution of 50g/L washs ammonium chloroplatinate precipitate；Ammonium chloroplatinate precipitate is sized mixing with hot water, reducing agent hydrazine hydrate is added also
Original obtains spongy platinum crude product；
S7：Spongy platinum crude product aqua regia dissolution in S6 and after catching up with nitre, is added sodium salt and platinum is complexed, addition 200g/
L；Then sodium hydroxide solution is added and adjusts pH value to 10, impurity enters precipitation, then filters out contamination precipitation object；
S8：The sodium salt complex solution of platinum in S7 analyzes pure salt and adjusts pH value to 3, is added and analyzes pure solid chlorine ammonia-sinking
Shallow lake platinum, ammonium chloride dosage are 5 times of theoretical amount；Spongy platinum product, calcining and decomposing temperature is made in ammonium chloroplatinate precipitate object calcining and decomposing
Degree is 1000 DEG C, time 10h.
In the S2, the one or more such as glucose, hydrazine hydrate, formic acid, sodium borohydride, iron powder, zinc powder, vulcanized sodium are added
Reducing agent or precipitating reagent.
In the S5, using nitric acid be oxidant when, nitric acid initial acidity be 5mol/L；The use of sodium chlorate is oxidant
When, sodium chlorate beginning a concentration of 50g/L, temperature is 100 DEG C, reaction time 8h；Control residual acidity is 1mol/ after reaction
L；
In the S6, hydrazine hydrate dosage is 5 times of theoretical amount, and reduction temperature is 100 DEG C, time 5h.
In the S7, sodium salt used is sodium chloride or sodium sulphate or sodium nitrite.
In the S2, precipitating reagent is added, a small amount of platinum being dissolved into solution precipitates.
Claims (6)
1. the method that a kind of molten carrier recycles platinum from aluminium-based catalyst, it is characterised in that：Include the following steps：
S1：Platinum-containing waste catalyst is subjected to carrier dissolving, the reagent used is the concentrated sulfuric acid, and sulfuric acid dosage is the 2 of platinum dead catalyst
~8 times, water addition is 3~10 times of raw material weight, and reaction temperature is 80~120 DEG C, and the reaction time is 2~8h；
S2：Reducing agent is added to restore a small amount of platinum being dissolved into solution；
S3：Clarification and solid-liquor separation are carried out, the solution in S2 is diluted with water, the volume after dilution reaches the 30 of platinum dead catalyst
~80 times, clarification is stood after mixing, after draining supernatant, bottom underflow is filtered to obtain platiniferous slag；
S4：Platiniferous slag is calcined to go carbon remover and organic matter, 500~1000 DEG C of calcination temperature；
S5：The calcining slag of S4 is carried out to the operation of dissolving platinum, agents useful for same is hydrochloric acid and oxidant, and liquid-solid ratio is 2/1~10/1,
Hydrochloric acid initial acidity is 1~10mol/L, and oxidant is nitric acid or sodium chlorate；
S6：It is slowly added to solid ammonium chloride in platiniferous solution into S5, generates ammonium chloroplatinate precipitate, filtering is used in combination 50g/L's
Ammonium chloride solution washs ammonium chloroplatinate precipitate；Ammonium chloroplatinate precipitate is sized mixing with hot water, reducing agent hydrazine hydrate reduction is added, obtains
Spongy platinum crude product；
S7：Spongy platinum crude product aqua regia dissolution in S6 and after catching up with nitre, is added sodium salt and platinum is complexed, addition is 20~200g/
L；Then sodium hydroxide solution is added and adjusts pH value to 7~10, impurity enters precipitation, then filters out contamination precipitation object；
S8：The sodium salt complex solution of platinum in S7 analyzes pure salt and adjusts pH value to 1~3, is added and analyzes pure solid chlorine ammonia-sinking
Shallow lake platinum, ammonium chloride dosage are 1~5 times of theoretical amount；Spongy platinum product, calcining and decomposing is made in ammonium chloroplatinate precipitate object calcining and decomposing
Temperature is 500~1000 DEG C, and the time is 1~10h.
2. the method that a kind of molten carrier according to claim 1 recycles platinum from aluminium-based catalyst, it is characterised in that：Institute
It states in S2, one or more of reducing agents or heavy such as glucose, hydrazine hydrate, formic acid, sodium borohydride, iron powder, zinc powder, vulcanized sodium is added
Shallow lake agent.
3. the method that a kind of molten carrier according to claim 1 recycles platinum from aluminium-based catalyst, it is characterised in that：Institute
State in S5, using nitric acid be oxidant when, nitric acid initial acidity be 1~5mol/L；Using sodium chlorate be oxidant when, sodium chlorate
Begin a concentration of 10~50g/L, and temperature is 40 DEG C~100 DEG C, and the reaction time is 2~8h；Control residual acidity is after reaction
0.2~1mol/L.
4. the method that a kind of molten carrier according to claim 1 recycles platinum from aluminium-based catalyst, it is characterised in that：Institute
It states in S6, hydrazine hydrate dosage is 1~5 times of theoretical amount, and reduction temperature is 50~100 DEG C, and the time is 1~5h.
5. the method that a kind of molten carrier according to claim 1 recycles platinum from aluminium-based catalyst, it is characterised in that：Institute
It states in S7, sodium salt used is sodium chloride or sodium sulphate or sodium nitrite.
6. the method that a kind of molten carrier according to claim 1 recycles platinum from aluminium-based catalyst, it is characterised in that：Institute
It states in S2, precipitating reagent is added, a small amount of platinum being dissolved into solution precipitates.
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| CN109216715A (en) * | 2018-08-02 | 2019-01-15 | 安徽科技学院 | It is a kind of rapidly and efficiently to improve the active method of business platinum ruthenium catalyst |
| CN110964919A (en) * | 2018-09-28 | 2020-04-07 | 荆门市格林美新材料有限公司 | Preparation method of spongy platinum |
| CN110964903A (en) * | 2018-09-28 | 2020-04-07 | 荆门市格林美新材料有限公司 | Recovery method for recovering gold from platinum-palladium concentrate |
| CN110964905A (en) * | 2018-09-28 | 2020-04-07 | 荆门市格林美新材料有限公司 | Method for purifying crude ammonium chloroplatinate |
| CN110964920A (en) * | 2018-09-28 | 2020-04-07 | 荆门市格林美新材料有限公司 | Method for recovering refined platinum from crude ammonium chloroplatinate |
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| CN110964918A (en) * | 2018-09-28 | 2020-04-07 | 荆门市格林美新材料有限公司 | Recovery method for recovering gold and tellurium from platinum-palladium concentrate and enriching platinum and palladium |
| CN109207734A (en) * | 2018-09-29 | 2019-01-15 | 江苏理工学院 | The extracting method of noble metal in a kind of ternary catalyzing unit waste material |
| CN110358922A (en) * | 2019-08-20 | 2019-10-22 | 泉州丰鹏环保科技有限公司 | A kind of recovery method containing Used palladium catalyst |
| CN114058849A (en) * | 2021-11-03 | 2022-02-18 | 核工业北京化工冶金研究院 | Method for recovering platinum and aluminum from aluminum-based platinum catalyst |
| CN115948659A (en) * | 2022-12-06 | 2023-04-11 | 昆明贵研催化剂有限责任公司 | Method for recovering superfine platinum powder from preparation tail liquid of platinum compound |
| RU2802033C1 (en) * | 2023-01-17 | 2023-08-22 | Общество с ограниченной ответственностью "Промышленные технологии рециклинга" | Method for processing deactivated automobile catalysts |
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Application publication date: 20180724 |