CN104726899A - Method for recycling silver and platinum from platinum-containing silver iodide - Google Patents
Method for recycling silver and platinum from platinum-containing silver iodide Download PDFInfo
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- CN104726899A CN104726899A CN201410844499.4A CN201410844499A CN104726899A CN 104726899 A CN104726899 A CN 104726899A CN 201410844499 A CN201410844499 A CN 201410844499A CN 104726899 A CN104726899 A CN 104726899A
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- silver iodide
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Abstract
The invention relates to a method for recycling silver and platinum from platinum-containing silver iodide. The method for recycling silver and platinum comprises the following process steps in sequence: (1) adding water into platinum-containing silver iodide to suspend platinum-containing silver iodide, adding alkali with stirring for adjusting pH, and slowly adding hydrazine hydrate for reducing purpose; (2) drying the reduced powder containing platinum and silver, smelting the dried product, and casting an anode plate; (3) adjusting the acidity of mother liquid, and performing electrolysis to obtain silver powder and anode mud; (4) drying the anode mud, smelting the dried product, and performing secondary electrolysis; and (5) leaching the secondary anode mud by chlorization, precipitating platinum with ammonium chloride, and performing reduction with hydrazine hydrate to obtain platinum powder. The invention proposes cleaning production and environment-friendly production for platinum-containing silver iodide to recycle silver and platinum. According to the invention, the overall recycling rate of silver and platinum is high, wherein the silver recycling rate is higher than 99.5 percent, and the platinum recycling rate is higher than 98.5 percent.
Description
Technical field
The invention belongs to precious metals metallurgy field, relate to a kind of method of recover silver and platinum from platiniferous Silver iodide
Technical background
Platinum-containing anticancer drug mainly contains carboplatin, cis-platinum etc., and in platinum-containing anticancer drug is produced, the platinum of some enters in silver iodide slag.The silver-colored platinum separation method reported at present has: (1) aqua regia dissolution method, and because in platiniferous Silver iodide, silver is main body, the content of platinum is lower, and employing chloroazotic acid directly dissolves platinum, and leaching effect is not good, and large platinum still remains in Silver iodide; (2) nitric acid divides silver-colored method, is reduced by Silver iodide, and with nitric acid dissolve silver, because the granularity of platinum is comparatively thin, active high, about 20%Pt is dissolved in salpeter solution, and with the heavy silver of sodium-chlor, part platinum is with Ag
2ptCl
6form and AgCl coprecipitation, and silver chloride can adsorb a large amount of platinum, causes silver-colored platinum separation difficulty; (3) vitriol oil separation of Silver platinum method, during concentrated sulfuric acid dissolution silver, part silver is wrapped up by platinum powder, and point silver-colored effect is bad, not only affects the recovery of silver, also affects the refining of platinum, and sulfuric acid dissolution silver speed is slower.Therefore new Study on Process is badly in need of, efficient recovery platinum and silver.
Summary of the invention
The object of this invention is to provide that a kind of technical process is succinct, environmental protection and the high method of the rate of recovery, technical problem to be solved by this invention is high efficiente callback silver and platinum.
The method of recover silver of the present invention and platinum is divided into four steps: (1) reduces; (2) melting; (3) electrolysis; (4) platinum refining.
(1) reduce: add aqueous suspension to platiniferous Silver iodide, adding alkali adjust ph is while stirring 10, is warming up to 80 DEG C, slowly adds hydrazine hydrate reduction, obtains platiniferous silver powder;
(2) melting: after reducing, platiniferous silver powder is dried, and utilize intermediate frequency furnace melting, smelting temperature is 1100 DEG C, cast positive plate;
(3) electrolysis: regulate mother liquor acidity to be 1 ~ 3, current density is 250A/m
2, electrolysis obtains electrolytic silver powder and the anode sludge, and by anode sludge oven dry, melting, re-electrolysis, obtains secondary anode mud.
(4) platinum refining: utilize chlorination process to soak platinum, acidity is 5mol/L, and sodium chlorate consumption is the anode sludge 20%, obtains platiniferous solution and insoluble slag, and ammonium chloride sinks platinum, obtains ammonium chloroplatinate, ammonium chloroplatinate is adjusted to alkalescence, slowly add hydrazine hydrate, obtain platinum powder; Insoluble slag Returning smelting, electrolysis.
The material that the present invention uses is platiniferous Silver iodide, and platinum content is 0.72%, and silver content is 44.84%.
The method of the present invention a kind of recover silver, platinum from platiniferous Silver iodide, the technical indicator of acquisition:
(1) abandon silver, platinum content in liquid and be all less than 0.001g/L;
(2) in electrolytic silver powder, the grade of silver is greater than 99.9%, and in silver powder, platinum content is lower than 5g/t, and platinum powder grade is greater than 99%.
(3) total yield of silver is greater than 99.5%, and the total yield of platinum is greater than 98.5%.
Advantage of the present invention is mainly: technical process is succinct, clean environment firendly and the high feature of the rate of recovery.Adopt the inventive method, discharge without waste gas, without toxic element in final leach liquor, improve labor condition, environmental friendliness.
Accompanying drawing explanation
Fig. 1 is process flow diagram of the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Embodiment 1, see accompanying drawing 1, takes 500g platiniferous Silver iodide, adds water to suspension, and adding alkali interpolation pH is 10, stirs and is warming up to 80 DEG C, slowly add hydrazine hydrate reduction, obtains reducing silver powder; Dried by silver powder, utilize intermediate frequency furnace melting, cast positive plate, electrolysis, obtains electrolytic silver powder and the anode sludge, by anode sludge washing, oven dry, melting, re-electrolysis, obtains secondary anode mud; Adopt chlorination process to leach platinum, salt acidacidity is 5mol/L, and sodium chlorate consumption is the anode sludge 20%, and ammonium chloride sinks platinum, utilizes hydrazine hydrate reduction, obtains platinum powder.Finally obtaining platinum grade is 99.5%, and the grade of electrolytic silver powder is 99.95%, and the platinum rate of recovery is 98.6%, and silver raising recovery rate is 99.8%.
Embodiment 2, see accompanying drawing 1, takes 1000g platiniferous Silver iodide, adds water to suspension, and adding alkali interpolation pH is 10, stirs and is warming up to 80 DEG C, slowly add hydrazine hydrate reduction, obtains reducing silver powder; Dried by silver powder, utilize intermediate frequency furnace melting, cast positive plate, electrolysis, obtains electrolytic silver powder and the anode sludge, by anode sludge washing, oven dry, melting, re-electrolysis, obtains secondary anode mud; Adopt chlorination process to leach platinum, salt acidacidity is 5mol/L, and sodium chlorate consumption is the anode sludge 20%, and ammonium chloride sinks platinum, utilizes hydrazine hydrate reduction, obtains platinum powder.Finally obtaining platinum grade is 99.3%, and the grade of electrolytic silver powder is 99.96%, and the platinum rate of recovery is 98.8%, and silver raising recovery rate is 99.9%.
Embodiment 3, see accompanying drawing 1, takes 5000g platiniferous Silver iodide, adds water to suspension, and adding alkali interpolation pH is 10, stirs and is warming up to 80 DEG C, slowly add hydrazine hydrate reduction, obtains reducing silver powder; Dried by silver powder, utilize intermediate frequency furnace melting, cast positive plate, electrolysis, obtains electrolytic silver powder and the anode sludge, by anode sludge washing, oven dry, melting, re-electrolysis, obtains secondary anode mud; Adopt chlorination process to leach platinum, salt acidacidity is 5mol/L, and sodium chlorate consumption is the anode sludge 20%, and ammonium chloride sinks platinum, utilizes hydrazine hydrate reduction, obtains platinum powder.Finally obtaining platinum grade is 99.1%, and the grade of electrolytic silver powder is 99.92%, and the platinum rate of recovery is 98.5%, and silver raising recovery rate is 99.7%.
Claims (5)
1. the method for recover silver and platinum from platiniferous Silver iodide, comprises following process steps successively:
(1) reduce;
(2) melting;
(3) electrolysis;
(4) platinum refining;
Concrete steps feature is: 1. add aqueous suspension to platiniferous Silver iodide, adds alkali adjust ph while stirring, and heating, slowly adds hydrazine hydrate reduction, obtain platiniferous silver powder; 2. by the oven dry of platiniferous silver powder, melting, cast positive plate; 3. regulate mother liquor acidity, Ag positive plate is placed in electrolyzer Inner electrolysis, obtains electrolytic silver powder and the anode sludge, by anode sludge oven dry, melting, re-electrolysis, obtains the anode sludge that platiniferous grade is higher; 4. potassium cloride secondary anode mud, obtains platiniferous solution and insoluble slag, by the electrolysis of insoluble slag Returning smelting, adds ammonium chloride and sinks platinum, utilize hydrazine hydrate reduction to obtain platinum powder in solution.
2. the method for a kind of recover silver and platinum from platiniferous Silver iodide according to claim 1, is characterized in that: the 1. described pH of step is 10, and temperature is 80 DEG C, recovery time 2h.
3. the method for a kind of recover silver and platinum from platiniferous Silver iodide according to claim 1, is characterized in that: the 2. described melting equipment of step is intermediate frequency furnace, and smelting temperature is 1100 DEG C.
4. the method for a kind of recover silver and platinum from platiniferous Silver iodide according to claim 1, is characterized in that: step 3. described mother liquor acidity is 1 ~ 3, and current density is 250A/m
2.
5. the method for a kind of recover silver and platinum from platiniferous Silver iodide according to claim 1, is characterized in that: step 4. described potassium cloride acidity is 5mol/L, and sodium chlorate consumption is the anode sludge 20%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201410844499.4A CN104726899B (en) | 2014-12-30 | 2014-12-30 | Method for recycling silver and platinum from platinum-containing silver iodide |
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| CN201410844499.4A CN104726899B (en) | 2014-12-30 | 2014-12-30 | Method for recycling silver and platinum from platinum-containing silver iodide |
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| CN104726899A true CN104726899A (en) | 2015-06-24 |
| CN104726899B CN104726899B (en) | 2017-05-17 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108707751A (en) * | 2018-06-20 | 2018-10-26 | 贵研资源（易门）有限公司 | A kind of restoring method of the low concentration platinum group metal in high alkalinity desiliconization liquid |
| CN110846501A (en) * | 2019-08-30 | 2020-02-28 | 中科铜都粉体新材料股份有限公司 | Comprehensive treatment process of silver-containing material in silver nitrate production |
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| CN1339611A (en) * | 2000-08-25 | 2002-03-13 | 贵研铂业股份有限公司 | Method for recovering silver-platinum from platinum containing silver iodide slag |
| CN101215641A (en) * | 2008-01-09 | 2008-07-09 | 昆明贵金属研究所 | Technique for separating and extracting platinum and silver from platinum-containing silver iodide waste material |
| CN101255501A (en) * | 2008-04-08 | 2008-09-03 | 昆明贵研药业有限公司 | Method for reclaiming platinum-silver-iodine form platinum-containing silver iodide slag |
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| CN1339611A (en) * | 2000-08-25 | 2002-03-13 | 贵研铂业股份有限公司 | Method for recovering silver-platinum from platinum containing silver iodide slag |
| CN101215641A (en) * | 2008-01-09 | 2008-07-09 | 昆明贵金属研究所 | Technique for separating and extracting platinum and silver from platinum-containing silver iodide waste material |
| CN101255501A (en) * | 2008-04-08 | 2008-09-03 | 昆明贵研药业有限公司 | Method for reclaiming platinum-silver-iodine form platinum-containing silver iodide slag |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108707751A (en) * | 2018-06-20 | 2018-10-26 | 贵研资源（易门）有限公司 | A kind of restoring method of the low concentration platinum group metal in high alkalinity desiliconization liquid |
| CN110846501A (en) * | 2019-08-30 | 2020-02-28 | 中科铜都粉体新材料股份有限公司 | Comprehensive treatment process of silver-containing material in silver nitrate production |
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| CN104726899B (en) | 2017-05-17 |
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