CN106363191A - Preparation method for platinum powder or platinum rhodium alloy powder - Google Patents
Preparation method for platinum powder or platinum rhodium alloy powder Download PDFInfo
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Abstract
The invention belongs to the field of platinum rhodium alloy and particularly relates to a preparation method for platinum powder or platinum rhodium alloy powder. The technical problem to be solved by the invention is to provide the preparation method for the platinum powder or the platinum rhodium alloy powder. The preparation method comprises the following steps that A, pretreatment is conducted, specifically, platinum or platinum rhodium alloy is soaked by hydrochloric acid, washed with water after taken out, and then placed a mixed solution of concentrated hydrochloric acid and concentrated nitric acid; B, dissolution is conducted, specifically, the system temperature is raised to 90-110 DEG C for full reaction, then nitric acid is fully driven away through concentrated hydrochloric acid, and afterwards, the dilution is conducted until the solution contains precious metal by 30-80 g/L; C, reduction is conducted, specifically, when the system temperature is raised to 80-90 DEG C, after a polyvinylpyrrolidone ethanol solution with the concentration of 20-60 g/L and hydrazine hydrate are added alternately, full reaction is conducted, and then alkali is added for neutralization till the solution is neutral; and D, aftertreatment is conducted, specifically, a 30-80 g/L ammonium bicarbonate aqueous solution is added, standing and sedimentation are conducted, and drying is conducted after precipitation and washing. Through the preparation method, the platinum powder or the platinum rhodium alloy powder which is high in granularity and purity, small in particle and uniform can be obtained.
Description
Technical field
The invention belongs to platinum-rhodium alloy field is and in particular to the preparation method of a kind of platinum powder or platinum-rhodium alloy powder.
Background technology
Ultrafine Platinum Powder or platinum-rhodium alloy powder material are the raw materials preparing platinum or platinum rhodium disperse material.By platinum in prior art
The method that golden or platinum-rhodium alloy is prepared into powder is roughly divided into Physical and chemical method, and wherein Physical has the sides such as sensing atomization
Method, it exists, and equipment requirements are high, put into expensive, the low shortcoming of yield rate；Wherein chemical method has the methods such as hydrazine hydrate reduction method, its
Have the shortcomings that yield rate is low.
Content of the invention
The defect existing for above-mentioned prior art, the present invention is researched and analysed based on hydrazine hydrate reduction method, thus carrying
Supply the preparation method of a kind of new platinum powder or platinum-rhodium alloy powder.The inventive method can produce granularity below 0.25mm's
Ultrafine Platinum Powder or platinum-rhodium alloy powder material, finished product sieving rate reaches more than 70%.
The technical problem to be solved is to provide a kind of method preparing platinum powder or platinum-rhodium alloy powder.The method bag
Include following steps:
A, pre-treatment: with soak with hydrochloric acid platinum or platinum-rhodium alloy, wash after taking-up, then be placed in acid solution；Described
Acid solution is the mixed solution of concentrated hydrochloric acid and concentrated nitric acid；
B, dissolving: system temperature is risen to 90～110 DEG C and fully reacts, more fully drive nitric acid away with concentrated hydrochloric acid, then dilute
Release to solution 30～80g/l containing noble metal；
C, reduction: system temperature is risen to 80～90 DEG C, being alternately added concentration is 20～60g/l Polyvinylpyrrolidone second
Alcoholic solution and hydrazine hydrate fully react, then plus alkali be neutralized to neutrality；
D, post processing: add 30～80g/l ammonium bicarbonate aqueous solution, standing sedimentation, washing of precipitate post-drying.
Preferably, the above-mentioned method preparing platinum powder or platinum-rhodium alloy powder, comprises the following steps:
A, pre-treatment: with soak with hydrochloric acid platinum or platinum-rhodium alloy, wash after taking-up, then be placed in acid solution；Described
Acid solution is the mixed solution of concentrated hydrochloric acid and concentrated nitric acid；
B, dissolving: system temperature is risen to 95～105 DEG C and fully reacts, more fully drive nitric acid away with concentrated hydrochloric acid, then dilute
Release to solution 40～60g/l containing noble metal；
C, reduction: system temperature is risen to 82～85 DEG C, being alternately added concentration is 30～50g/l Polyvinylpyrrolidone second
Then plus alkali is neutralized to neutrality alcoholic solution and hydrazine hydrate fully react,；
D, post processing: add 40～60g/l ammonium bicarbonate aqueous solution, standing sedimentation, washing of precipitate post-drying.
Preferably, in said method step b, described drive nitric acid away after also include before dilute solution adding water to drive a large amount of salt away
Acid.
Preferably, in said method step a, the size of described platinum or platinum-rhodium alloy is long below 400mm, wide 150mm
Below, thick below 0.2mm.
Preferably, in said method step a, described hydrochloric acid is that concentrated hydrochloric acid is formulated according to volume ratio 1 2～8 with water.
Preferably, in said method step a, in described platinum-rhodium alloy, the content of rhodium is below 20%.
Preferably, in said method step a, described soak time is 0.5～1h.
Preferably, in said method step a, described acid solution is concentrated hydrochloric acid and concentrated nitric acid is prepared according to volume ratio 2～8 1
Form.
Preferably, in said method step b, described it is diluted to solution 50g/l containing noble metal.
Preferably, in said method step c, the concentration of described Polyvinylpyrrolidone ethanol solution is 40g/l.
Preferably, in said method step c, the addition of described Polyvinylpyrrolidone ethanol solution is 1～1.1l/kg
Noble metal.
Preferably, in said method step c, the addition of described hydrazine hydrate is 0.7～0.8l/1kg noble metal.
Preferably, in said method step c, described neutralization is carried out using ammonia.
Preferably, in said method step d, the concentration of described ammonium bicarbonate aqueous solution is 50g/l.
Preferably, in said method step d, the addition of described ammonium bicarbonate soln is 2.3～2.5l/1kg noble metal.
Platinum powder that the inventive method prepares or platinum-rhodium alloy Powder Particle Size below 0.25mm sieving rate reach 70% with
On；When reasonably optimal control response parameter further, the sieving rate below granularity 0.25mm reaches more than 90%, or even enters one
Step can reach 99% about.Platinum powder or platinum-rhodium alloy powder are the raw materials preparing platinum or platinum rhodium disperse material, so, the present invention
Method is that the preparation of disperse material provides a kind of more preferable raw material.
Specific embodiment
A kind of platinum powder or the preparation method of platinum-rhodium alloy powder, comprise the following steps:
A, pre-treatment: soak platinum or platinum-rhodium alloy to remove some impurity contained therein, Ran Houqu with hydrochloric acid solution
Go out and rinsed well with water, transfer in acid solution；Described acid solution is concentrated hydrochloric acid and concentrated nitric acid mixed solution；Wherein, institute
Stating hydrochloric acid solution is that concentrated hydrochloric acid is formulated according to volume ratio 1 2～8 with water；Described acid solution be concentrated hydrochloric acid and concentrated nitric acid by
It is formulated according to volume ratio 2～8 1；
B, dissolving: system temperature is warming up to 90～110 DEG C makes acid solution and platinum or platinum-rhodium alloy fully react to no
Solid exists；Because intensification hydrochloric acid and nitric acid can volatilize in course of reaction, so needing in course of reaction optionally to supplement addition acid
Solution；Or reaction unit is airtight, only stay waste emission pipeline；
In the presence of no solid, as reaction terminates；Then concentrated hydrochloric acid is added fully to drive nitric acid away to no yellow at twice
Cigarette produces；Meanwhile, the aqueous slkali consumed in order to save follow-up neutralization, adds pure water and drives a large amount of hydrochloric acid away, so after driving nitric acid away
Dilute solution is to containing noble metal 30～80g/l afterwards；Now solution is maroon；
C, reduction: system is warming up to 80～90 DEG C, is alternately added Polyvinylpyrrolidone ethanol solution and hydrazine hydrate fills
It is colourless for point being reduced to solution, then to be neutralized to ph with ammonia be 6～7, places cooling；Described Polyvinylpyrrolidone ethanol solution
Concentration be 20～60g/l；
D, post processing: the ammonium bicarbonate soln of stirring addition 30～80g/l, quiescent settling, extract out after supernatant clarification
Reclaim, precipitation, after acetone, dehydrated alcohol, pure water cleaning, is dried at 120 DEG C.
Noble metal described in said method step b is platinum or platinum-rhodium alloy, when raw material is for platinum, herein expensive
Metal is platinum；When raw material is for platinum-rhodium alloy, the total amount of noble metal as platinum and rhodium herein.
The finished product platinum powder being prepared by said method or platinum-rhodium alloy Powder Particle Size assign more than 70% in 0.25mm,
Other performances all can meet use requirement.Obtained platinum or platinum-rhodium alloy powder can be by conventional method addition disperse means
Prepare disperse material.
Preferably, the above-mentioned method preparing platinum powder or platinum-rhodium alloy powder, comprises the following steps:
A, pre-treatment: with soak with hydrochloric acid platinum or platinum-rhodium alloy, wash after taking-up, then be placed in acid solution；Described
Acid solution is the mixed solution of concentrated hydrochloric acid and concentrated nitric acid；
B, dissolving: system temperature is risen to 95～105 DEG C and fully reacts, more fully drive nitric acid away with concentrated hydrochloric acid, then dilute
Release to solution 40～60g/l containing noble metal；
C, reduction: when system temperature rises to 82～85 DEG C, being alternately added concentration is 30～50g/l Polyvinylpyrrolidone second
Then plus alkali is neutralized to neutrality fully react after alcoholic solution and hydrazine hydrate,；
D, post processing: add 40～60g/l ammonium bicarbonate aqueous solution, standing sedimentation, extract out after supernatant clarification and reclaim,
Precipitation, after acetone, dehydrated alcohol, pure water cleaning, is dried at 120 DEG C.
The finished product platinum powder being prepared by said method or platinum-rhodium alloy Powder Particle Size assign more than 90% in 0.25mm,
Other performances all can meet use requirement.Obtained platinum or platinum-rhodium alloy powder can be by conventional method addition disperse means
Prepare disperse material.
In said method step a, in order to fully remove contained impurity in platinum or platinum-rhodium alloy, and do not lose time,
Described soak time is 0.5～1h.
In said method step b, the concentration after such as diluting is less than 30g/l, can extend the sequential reduction time, reduces finished product
Rate；As higher than 80g/l, led to reduce granule change greatly, reduce yield rate；So need to control after dilution solution contain noble metal 30～
80g/l.It is preferably 40～60g/l.More preferably 50g/l.
In said method step c, it is neutralized to the neutral aqueous slkali that can adopt routine, such as sodium hydroxide, potassium hydroxide, but is somebody's turn to do
During can bring impurity, affect purity.It is advantageous to using ammonia.
In said method step c, the concentration of such as Polyvinylpyrrolidone ethanol solution is less than 20g/l, can lead to reduction
Grain granularity becomes big, reduces yield rate；Concentration as Polyvinylpyrrolidone ethanol solution is higher than 60g/l, can lead to reduce granule
Meticulous, extend subsequent operation time, reduction not exclusively, reduce yield rate；So Polyvinylpyrrolidone ethanol solution need to be controlled
Concentration be 20～60g/l.It is preferably 30～50g/l.More preferably 40g/l.
In said method step d, equally in order to meet sedimented particle granularity, ammonium bicarbonate aqueous solution concentration need to be controlled to be 30
～80g/l.It is preferably 40～60g/l.More preferably 50g/l.
Preferably, in said method step c, the addition of described Polyvinylpyrrolidone ethanol solution is 1～1.1l/kg
Noble metal.
Preferably, in said method step c, the addition of described hydrazine hydrate is 0.7～0.8l/1kg noble metal.
Preferably, in said method step d, the addition of described ammonium bicarbonate soln is 2.3～2.5l/1kg noble metal.
Embodiment 1
A, pre-treatment: soak platinum or platinum-rhodium alloy with hydrochloric acid solution (volume ratio of concentrated hydrochloric acid and water is 1 2), after taking-up
Rinsed well with pure water, transfer in the reactor containing acid solution (concentrated hydrochloric acid is 51 with the volume ratio of concentrated nitric acid)；
B, dissolving: system temperature is warming up to 90 DEG C makes acid solution and platinum or platinum-rhodium alloy fully react and go out to no solid
Existing, add concentrated hydrochloric acid fully to drive nitric acid away at twice and produce to no yellow cigarette；Meanwhile, the alkali consumed in order to save follow-up neutralization,
Add pure water after driving nitric acid away and drive a large amount of hydrochloric acid away, then dilute solution extremely 30g/l containing noble metal；Now solution is brown red
Color；
C, reduction: system is warming up to 80 DEG C, is alternately added Polyvinylpyrrolidone ethanol solution and hydrazine hydrate is fully gone back
It is colourless as far as solution, then is neutralized to ph for 6～7 with ammonia, place cooling；Described Polyvinylpyrrolidone ethanol solution dense
Spend for 20g/l；The addition of described Polyvinylpyrrolidone ethanol solution is 1～1.1l/kg noble metal；Described hydrazine hydrate plus
Entering amount is 0.7～0.8l/1kg noble metal；
D, post processing: stirring adds the ammonium bicarbonate soln of 30g/l, addition is 2.3～2.5l/1kg noble metal, static
Sedimentation, extracts out after supernatant clarification and reclaims, and precipitation, after acetone, dehydrated alcohol, pure water cleaning, is dried at 120 DEG C.
The platinum powder that prepared by said method or platinum-rhodium alloy Powder Particle Size in the yield rate 68% of below 0.25mm, its
He meets use requirement at performance.
Embodiment 2
A, pre-treatment: soak platinum or platinum-rhodium alloy with hydrochloric acid solution (volume ratio of concentrated hydrochloric acid and water is 1 3), after taking-up
Rinsed well with pure water, transfer in the reactor containing acid solution (concentrated hydrochloric acid is 31 with the volume ratio of concentrated nitric acid)；
B, dissolving: system temperature is warming up to 100 DEG C makes acid solution and platinum or platinum-rhodium alloy fully react to no solid
Occur, add concentrated hydrochloric acid fully to drive nitric acid away at twice and produce to no yellow cigarette；Meanwhile, in order to save what follow-up neutralization was consumed
Alkali, adds pure water and drives a large amount of hydrochloric acid away after driving nitric acid away, then dilute solution extremely 80g/l containing noble metal；Now solution is brown
Red；
C, reduction reaction: system is warming up to 85 DEG C, is alternately added Polyvinylpyrrolidone ethanol solution and hydrazine hydrate fills
It is colourless for point being reduced to solution, then to be neutralized to ph with ammonia be 6～7, places cooling；Described Polyvinylpyrrolidone ethanol solution
Concentration be 60g/l；The addition of described Polyvinylpyrrolidone ethanol solution is 1～1.1l/kg noble metal；Described hydrazine hydrate
Addition be 0.7～0.8l/1kg noble metal；
D, post processing: stirring adds the ammonium bicarbonate soln of 80g/l, addition is 2.3～2.5l/1kg noble metal, static
Sedimentation, extracts out after supernatant clarification and reclaims, and precipitation, after acetone, dehydrated alcohol, pure water cleaning, is dried at 120 DEG C.
The platinum powder that prepared by said method or platinum-rhodium alloy Powder Particle Size in the yield rate 72% of below 0.25mm, its
He meets use requirement at performance.
Embodiment 3
A, pre-treatment: soak platinum or platinum-rhodium alloy with hydrochloric acid solution (volume ratio of concentrated hydrochloric acid and water is 1 8), after taking-up
Rinsed well with pure water, transfer in the reactor containing acid solution (concentrated hydrochloric acid is 81 with the volume ratio of concentrated nitric acid)；
B, dissolving: system temperature is warming up to 110 DEG C makes acid solution and platinum or platinum-rhodium alloy fully react to no solid
Occur, add concentrated hydrochloric acid fully to drive nitric acid away at twice and produce to no yellow cigarette；Meanwhile, in order to save what follow-up neutralization was consumed
Alkali, adds pure water and drives a large amount of hydrochloric acid away after driving nitric acid away, then dilute solution extremely 80g/l containing noble metal；Now solution is brown
Red；
C, reduction reaction: system is warming up to 90 DEG C, is alternately added Polyvinylpyrrolidone ethanol solution and hydrazine hydrate fills
It is colourless for point being reduced to solution, then to be neutralized to ph with ammonia be 6～7, places cooling；Described Polyvinylpyrrolidone ethanol solution
Concentration be 40g/l；The addition of described Polyvinylpyrrolidone ethanol solution is 1～1.1l/kg noble metal；Described hydrazine hydrate
Addition be 0.7～0.8l/1kg noble metal；
D, post processing: stirring adds the ammonium bicarbonate soln of 50g/l, addition is 2.3～2.5l/1kg noble metal, static
Sedimentation, extracts out after supernatant clarification and reclaims, and precipitation, after acetone, dehydrated alcohol, pure water cleaning, is dried at 120 DEG C.
The platinum powder that prepared by said method or platinum-rhodium alloy Powder Particle Size in the yield rate 86% of below 0.25mm, its
He meets use requirement at performance.
Embodiment 4
A, pre-treatment: soak platinum or platinum-rhodium alloy to remove with hydrochloric acid solution (volume ratio of concentrated hydrochloric acid and water is 1 3)
Impurity therein, is rinsed well with pure water after taking-up, transfers to that (concentrated hydrochloric acid with the volume ratio of concentrated nitric acid is containing acid solution
3 1) in reactor；
B, dissolving: system temperature is warming up to 98 DEG C makes acid solution and platinum or platinum-rhodium alloy fully react and go out to no solid
Existing, add concentrated hydrochloric acid fully to drive nitric acid away at twice and produce to no yellow cigarette；Meanwhile, the alkali consumed in order to save follow-up neutralization,
Add pure water after driving nitric acid away and drive a large amount of hydrochloric acid away, then dilute solution extremely 45g/l containing noble metal；Now solution is brown red
Color；
C, reduction reaction: system is warming up to 83 DEG C, is alternately added Polyvinylpyrrolidone ethanol solution and hydrazine hydrate fills
It is colourless for point being reduced to solution, then to be neutralized to ph with ammonia be 6～7, places cooling；Described Polyvinylpyrrolidone ethanol solution
Concentration be 38g/l；The addition of described Polyvinylpyrrolidone ethanol solution is 1～1.1l/kg noble metal；Described hydrazine hydrate
Addition be 0.7～0.8l/1kg noble metal；
D, post processing: stirring adds the ammonium bicarbonate soln of 42g/l, addition is 2.3～2.5l/1kg noble metal, static
Sedimentation, extracts out after supernatant clarification and reclaims, and precipitation, after acetone, dehydrated alcohol, pure water cleaning, is dried at 120 DEG C.
The platinum powder that prepared by said method or platinum-rhodium alloy Powder Particle Size in the yield rate 94% of below 0.25mm, its
He meets use requirement at performance.
Embodiment 5
A, pre-treatment: soak platinum or platinum-rhodium alloy to remove with hydrochloric acid solution (volume ratio of concentrated hydrochloric acid and water is 1 6)
Impurity therein, is rinsed well with pure water after taking-up, transfers to that (concentrated hydrochloric acid with the volume ratio of concentrated nitric acid is containing acid solution
7 1) in reactor；
B, dissolving: system temperature is warming up to 102 DEG C makes acid solution and platinum or platinum-rhodium alloy fully react to no solid
Occur, add concentrated hydrochloric acid fully to drive nitric acid away at twice and produce to no yellow cigarette；Meanwhile, in order to save what follow-up neutralization was consumed
Alkali, adds pure water and drives a large amount of hydrochloric acid away after driving nitric acid away, then dilute solution extremely 55g/l containing noble metal；Now solution is brown
Red；
C, reduction reaction: system is warming up to 84 DEG C, is alternately added Polyvinylpyrrolidone ethanol solution and hydrazine hydrate fills
It is colourless for point being reduced to solution, then to be neutralized to ph with ammonia be 6～7, places cooling；Described Polyvinylpyrrolidone ethanol solution
Concentration be 46g/l；The addition of described Polyvinylpyrrolidone ethanol solution is 1～1.1l/kg noble metal；Described hydrazine hydrate
Addition be 0.7～0.8l/1kg noble metal；
D, post processing: stirring adds the ammonium bicarbonate soln of 48g/l, addition is 2.3～2.5l/1kg noble metal, static
Sedimentation, extracts out after supernatant clarification and reclaims, and precipitation, after acetone, dehydrated alcohol, pure water cleaning, is dried at 120 DEG C.
The platinum powder that prepared by said method or platinum-rhodium alloy Powder Particle Size in the yield rate 95% of below 0.25mm, its
He meets use requirement at performance.
Embodiment 6
A, pre-treatment: soak platinum or platinum-rhodium alloy with hydrochloric acid solution (volume ratio of concentrated hydrochloric acid and water is 1 5), after taking-up
Rinsed well with pure water, transfer in the reactor containing acid solution (concentrated hydrochloric acid is 51 with the volume ratio of concentrated nitric acid)；
B, dissolving: system temperature is warming up to 100 DEG C makes chloroazotic acid and platinum or platinum-rhodium alloy fully react and go out to no solid
Existing, add concentrated hydrochloric acid fully to drive nitric acid away at twice and produce to no yellow cigarette；Meanwhile, the alkali consumed in order to save follow-up neutralization,
Add pure water after driving nitric acid away and drive a large amount of hydrochloric acid away, then dilute solution extremely 50g/l containing noble metal；Now solution is brown red
Color；
C, reduction reaction: system is warming up to 83 DEG C, is alternately added Polyvinylpyrrolidone ethanol solution and hydrazine hydrate fills
It is colourless for point being reduced to solution, then to be neutralized to ph with ammonia be 6～7, places cooling；Described Polyvinylpyrrolidone ethanol solution
Concentration be 40g/l；The addition of described Polyvinylpyrrolidone ethanol solution is 1～1.1l/kg noble metal；Described hydrazine hydrate
Addition be 0.7～0.8l/1kg noble metal；
D, post processing: stirring adds the ammonium bicarbonate soln of 50g/l, addition is 2.3～2.5l/1kg noble metal, static
Sedimentation, extracts out after supernatant clarification and reclaims, and precipitation, after acetone, dehydrated alcohol, pure water cleaning, is dried at 120 DEG C.
The platinum powder being prepared by said method or platinum-rhodium alloy Powder Particle Size are 99% in the ratio defective product of below 0.25mm,
Other performances meet use requirement.
Claims (10)
1. prepare the method for platinum powder or platinum-rhodium alloy powder it is characterised in that: comprise the following steps:
A, pre-treatment: with soak with hydrochloric acid platinum or platinum-rhodium alloy, wash after taking-up, then be placed in acid solution；Described acid is molten
Liquid is the mixed solution of concentrated hydrochloric acid and concentrated nitric acid；
B, dissolving: system temperature is risen to 90～110 DEG C and fully reacts, more fully drive nitric acid away with concentrated hydrochloric acid, be then diluted to
Solution 30～80g/l containing noble metal；
C, reduction: system temperature is risen to 80～90 DEG C, being alternately added concentration is that 20～60g/l Polyvinylpyrrolidone ethanol is molten
Liquid and hydrazine hydrate fully react, then plus alkali be neutralized to neutrality；
D, post processing: add 30～80g/l ammonium bicarbonate aqueous solution, standing sedimentation, washing of precipitate post-drying.
2. the method preparing platinum powder or platinum-rhodium alloy powder according to claim 1 it is characterised in that: comprise the following steps:
A, pre-treatment: with soak with hydrochloric acid platinum or platinum-rhodium alloy, wash after taking-up, then be placed in acid solution；Described acid is molten
Liquid is the mixed solution of concentrated hydrochloric acid and concentrated nitric acid；
B, dissolving: system temperature is risen to 95～105 DEG C and fully reacts, more fully drive nitric acid away with concentrated hydrochloric acid, be then diluted to
Solution 40～60g/l containing noble metal；
C, reduction: system temperature is risen to 82～85 DEG C, being alternately added concentration is that 30～50g/l Polyvinylpyrrolidone ethanol is molten
Then plus alkali is neutralized to neutrality liquid and hydrazine hydrate fully react,；
D, post processing: add 40～60g/l ammonium bicarbonate aqueous solution, standing sedimentation, washing of precipitate post-drying.
3. the method preparing platinum powder or platinum-rhodium alloy powder according to claim 1 and 2 it is characterised in that: in step b, institute
Also include before stating dilute solution after driving nitric acid away adding water to drive a large amount of hydrochloric acid away.
4. the method preparing platinum powder or platinum-rhodium alloy powder according to any one of claims 1 to 3 it is characterised in that: step a
In, the size of described platinum or platinum-rhodium alloy is long below 400mm, wide below 150mm, thick below 0.2mm.
5. the method preparing platinum powder or platinum-rhodium alloy powder according to any one of claims 1 to 3 it is characterised in that: step a
In, described hydrochloric acid is that concentrated hydrochloric acid is formulated according to volume ratio 1 2～8 with water.
6. the method preparing platinum powder or platinum-rhodium alloy powder according to any one of claims 1 to 3 it is characterised in that: step a
In, described acid solution is concentrated hydrochloric acid and concentrated nitric acid is formulated according to volume ratio 2～8 1.
7. the method preparing platinum powder or platinum-rhodium alloy powder according to Claims 2 or 3 it is characterised in that: in step b, institute
State and be diluted to solution 50g/l containing noble metal.
8. the method preparing platinum powder or platinum-rhodium alloy powder according to Claims 2 or 3 it is characterised in that: in step c, institute
The concentration stating Polyvinylpyrrolidone ethanol solution is 40g/l.
9. the method preparing platinum powder or platinum-rhodium alloy powder according to Claims 2 or 3 it is characterised in that: in step d, institute
The concentration stating ammonium bicarbonate aqueous solution is 50g/l.
10. the method preparing platinum powder or platinum-rhodium alloy powder according to any one of claims 1 to 3 it is characterised in that: step
In c, the addition of described Polyvinylpyrrolidone ethanol solution is 1～1.1l/kg noble metal；The addition of described hydrazine hydrate is
0.7～0.8l/1kg noble metal；In step d, the addition of described ammonium bicarbonate soln is 2.3～2.5l/1kg noble metal.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107324409A (en) * | 2017-07-27 | 2017-11-07 | 成都光明派特贵金属有限公司 | A kind of method for preparing platinum nitrate solution |
| CN111286626A (en) * | 2020-03-11 | 2020-06-16 | 无锡英特派金属制品有限公司 | Method for purifying platinum-rhodium alloy |
| CN113087027A (en) * | 2021-04-14 | 2021-07-09 | 成都光明派特贵金属有限公司 | Rhodium powder dissolving method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107324409A (en) * | 2017-07-27 | 2017-11-07 | 成都光明派特贵金属有限公司 | A kind of method for preparing platinum nitrate solution |
| CN111286626A (en) * | 2020-03-11 | 2020-06-16 | 无锡英特派金属制品有限公司 | Method for purifying platinum-rhodium alloy |
| CN113087027A (en) * | 2021-04-14 | 2021-07-09 | 成都光明派特贵金属有限公司 | Rhodium powder dissolving method |
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