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Technology for recycling platinum and palladium from acid solution containing low concentration of platinum family precious metals by adopting reducing precipitation method

An acidic solution and precious metal technology, applied in the field of metallurgy, can solve the problems of high cost, low platinum and palladium content, toxicity and carcinogenicity, etc., and achieve the effect of low cost, high reduction efficiency and easy filtration

Inactive Publication Date: 2013-12-04
NORTHWEST NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But platinum-palladium content is low in the platinum-palladium concentrate that metal replacement method obtains, and loss is big when reclaiming platinum-palladium, can generate the highly acidic waste liquid of very high concentration zinc chloride, ferric chloride, aluminum chloride in the recovery process, and It is necessary to increase the cost when dealing with these polluted waste liquids
In addition, metals such as zinc, powder, and magnesium are also expensive and costly; hydrazine hydrate has strong reducing properties, but its reaction violently releases a large amount of gas, which is difficult to control, and hydrazine hydrate itself is toxic and carcinogenic, causing environmental pressure

Method used

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  • Technology for recycling platinum and palladium from acid solution containing low concentration of platinum family precious metals by adopting reducing precipitation method
  • Technology for recycling platinum and palladium from acid solution containing low concentration of platinum family precious metals by adopting reducing precipitation method
  • Technology for recycling platinum and palladium from acid solution containing low concentration of platinum family precious metals by adopting reducing precipitation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The composition of the acid feed solution containing platinum and palladium is shown in Table 1 below (mg / L)

[0023]

[0024] Take 5 mL of the platinum-palladium-containing acid feed solution composed in Table 1, and slowly add 6 mol L -1 Sodium hydroxide solution to pH = 1.0, add 0.21g sodium formate solid (30g / L in the total volume of the pH-adjusted feed liquid), heat in a boiling water bath for 1h, cool to room temperature, and stand for 12 hours; add 0.03 mL 10% sodium borohydride-10% sodium hydroxide mixed solution, then keep warm at 50°C~60°C for 10min, cool down to room temperature naturally, add 0.025mL0.01% polyacrylamide (the concentration of polyacrylamide in the system is 0.3 mg / L), placed for 12 hours, centrifugal sedimentation, platinum -1 1mL of sulfuric acid, reacted in a water bath at 50°C~60°C for 30min, centrifuged to settle, washed the precipitate with water three times; then added 2mL of 4mol·L -1 Hydrochloric acid-2% sodium chlorate mixture, ...

Embodiment 2

[0026] The composition of platinum-containing palladium acid feed solution is the same as in Example 1.

[0027] Take 100 mL of platinum-palladium-containing acidic feed solution, slowly add 6 mol L -1 sodium hydroxide solution to pH = 1.0, add 3.6g of sodium formate solid (concentration in the feed liquid: 30g / L), heat in a boiling water bath for 1h, cool to room temperature, and let stand for 12 hours; add 0.5mL of 10% sodium borohydride-10 % sodium hydroxide mixture, then keep it warm at 50°C~60°C for 10min, cool to room temperature naturally, let stand for 12h, then add 0.2mL0.01% polyacrylamide (the concentration of polyacrylamide in the system is 0.2mg / L) , centrifugal sedimentation, platinum -1 5mL of sulfuric acid, reacted in a water bath at 50°C~60°C for 30min, centrifuged to settle, washed the precipitate with water, and then added 5mL of 6mol·L -1 Hydrochloric acid-2% sodium chlorate mixed solution, react at 65~75°C for 20 minutes to dissolve all the precipitates, ...

Embodiment 3

[0029] The composition of the acid feed solution containing platinum and palladium is shown in the following table 2 (mg / L)

[0030]

[0031] Take 5 mL of platinum-palladium-containing acidic feed solution, slowly add 6 mol L -1 Sodium hydroxide solution to pH = 1.0, add 0.21g sodium formate solid (concentration in the feed liquid is 30g / L), heat in boiling water bath for 1h, cool to room temperature, and let stand for 12 hours; add 0.03mL 10% sodium borohydride- 10% sodium hydroxide mixed solution, then keep warm at 50°C~60°C for 10min, cool down to room temperature naturally, then add 0.025mL 0.01% polyacrylamide (the concentration of polyacrylamide in the system is 0.3mg / L), place After 12 hours, centrifuge to settle, and the platinum in the supernatant of the precipitate is less than 0.5 mg / L, and the palladium is less than 0.1 mg / L. Add 1mol·L to the sediment slurry -1 2mL of sulfuric acid, reacted in a water bath at 50°C~60°C for 20min, centrifuged to settle, washed...

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Abstract

The invention discloses a method for recycling platinum and palladium from precious metal acid solution by adopting a reducing precipitation method, and belongs to the technical field of metallurgy. The method comprises the following steps: enabling a reducing precipitation agent formed by sodium formate and sodium borohydride to react with material liquid containing platinum and palladium, so as to precipitate platinum and palladium; filtering precipitation; dissolving base metals in the precipitation by dilute sulphuric acid; further, dissolving precipitation residues containing platinum and palladium by dilute sulphuric acid and sodium chlorate; finally, obtaining chlorination liquid containing a great amount of platinum and palladium, concentrating the chlorination liquid, and refining to recycle platinum and palladium through performing the process of precipitating platinum by ammonium chloride on the chlorination liquid. According to the invention, the technology is simple and low in cost, and generates little pollution; the precipitation rate of platinum and palladium precious metals can reach over 99.9%, the platinum family metal recycling ratio is greatly improved, and the comprehensive utilization of precious metal resources is realized.

Description

technical field [0001] The invention belongs to the technical field of metallurgy and relates to a method for recovering precious metals, in particular to a process for recovering platinum and palladium from an acidic solution containing a relatively low concentration of platinum group noble metals by adopting a reduction precipitation method. Background technique [0002] Platinum group metals are known for their particularly valuable properties and rare resources, and are collectively called "precious metals" together with gold and silver. Platinum group metals and their various compounds have the characteristics of high temperature resistance, corrosion resistance, oxidation resistance, wear resistance, good strength at high temperature, good ductility, and low expansion coefficient, and are widely used in petrochemical, aviation, electronics, atomic energy, experimental Utensils, medicine, etc. Platinum group elements occur in nature in the form of natural elements, int...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B3/44C22B3/10C22B11/00
CPCY02P10/20
Inventor 彭波吴红平张蓉沈莹萍李婷婷张彰查飞
Owner NORTHWEST NORMAL UNIVERSITY
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