Method for separating and recycling metal silver and gallium

A technology for separation and recovery of metal silver, applied in the field of separation and recovery of metal silver and gallium, can solve the problems of many process steps, high acid consumption, long reaction time, etc., and achieve the effect of reducing hoarding, less acid consumption and fast speed

Inactive Publication Date: 2021-09-07
FIRST RARE MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are few specific silver and gallium waste recovery process schemes in the industry. The secondary materials for silver or gallium are mainly wet process. Metal silver is recovered through the process of acid leaching-precipitation enrichment-melting reduction-electrolysis. Gallium metal is recovered by electrodeposition after acid leaching or alkali leaching, extraction or ion exchange enrichment, and the main problems of the wet process are more acid consumption, long reaction time, and many process steps

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  • Method for separating and recycling metal silver and gallium

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Weigh 100g of silver-gallium target cutting material, then add 9g of sodium carbonate and mix it evenly, and then smelt: put the mixture in an environment of 1100°C for 4h, and at the same time, pass compressed air at a rate of 2L / min.

[0033] Recover gallium metal: Add the scum obtained after smelting to NaOH solution with a concentration of 150g / L (the mass ratio of scum to NaOH solution is 1:20) for leaching, and after leaching at 80°C for 4h, filter to obtain the leaching solution ( filtrate), and then recover metal gallium by electrolysis process: adjust the NaOH concentration in the leaching solution to 150g / L, select stainless steel for both cathode and anode, and current density 1000A / m 2 , the electrolysis temperature is 25 ℃, and the purity of 99.99% gallium metal is obtained by electrodeposition.

[0034]Metal silver recovery: metal silver is recovered through the electrolysis process, the silver ingot obtained after smelting is directly used as the anode, t...

Embodiment 2

[0036] Weigh 100g of silver-gallium target cutting material, then add 11g of sodium carbonate and 0.2g of sodium hydroxide, mix evenly, and then smelt: put the mixture in an environment of 1100°C for 6 hours, and feed oxygen at a rate of 2L / min.

[0037] Recover gallium metal: Add the scum obtained after smelting to NaOH solution with a concentration of 180g / L (the mass ratio of scum to NaOH solution is 1:15) for leaching, and after leaching at 95°C for 4h, filter to obtain the leaching solution ( filtrate), and then recover metal gallium by electrolysis process: adjust the NaOH concentration in the leaching solution to 200g / L, select stainless steel for both cathode and anode, and current density 1500A / m 2 , the electrolysis temperature is 40°C, and the purity of 99.99% gallium metal is obtained by electrodeposition.

[0038] Metal silver recovery: metal silver is recovered through the electrolysis process, and the silver ingot obtained after smelting is directly used as the ...

Embodiment 3

[0040] Weigh 100g of silver-gallium target cutting material, then add 9g of sodium carbonate and 0.45g of sodium hydroxide, mix evenly, and then smelt: put the mixture in an environment of 1200°C for 4 hours, and feed compressed air at a rate of 4L / min at the same time .

[0041] Recover gallium metal: Add the scum obtained after smelting to NaOH solution with a concentration of 200g / L (the mass ratio of scum to NaOH solution is 1:10) for leaching, and after leaching at 80°C for 6h, filter to obtain the leaching solution ( filtrate), and then recover metal gallium by electrolysis process: adjust the NaOH concentration in the leaching solution to 200g / L, select stainless steel for both cathode and anode, and current density 1800A / m 2 , the electrolysis temperature is 60°C, and the purity of gallium metal is 99.992% through electrodeposition.

[0042] Metal silver recovery: metal silver is recovered through the electrolysis process, and the silver ingot obtained after smelting ...

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Abstract

The invention provides a method for separating and recycling metal silver and gallium. The method comprises the steps that S1, waste containing silver and gallium and an alkali material are evenly mixed and then smelted; S2, dross obtained after smelting in S1 is soaked with alkali liquor and filtered, and then leach liquor is subjected to electro-deposition to obtain metal gallium; and S3, a silver ingot obtained after smelting in S1 serves as an anode, silver nitrate serves as electrolyte, and metal silver is purified through electrolysis. According to the method for separating and recycling metal silver and gallium, the pyrogenic process and the wet process are combined, then silver and gallium can be rapidly separated and recycled, the whole technological process is low in acid consumption and high in speed, accumulation of silver powder can be reduced, and the purity of the recycled product is good.

Description

technical field [0001] The present disclosure relates to the field of separation and recovery of rare metals, in particular to a method for separation and recovery of metal silver and gallium. Background technique [0002] As rare and precious metal raw materials, silver and gallium have irreplaceable applications in solar energy, electronics, semiconductor industries and other fields, especially in the application of high electrical and thermal conductivity materials. At present, there are few specific silver and gallium waste recovery process schemes in the industry. The secondary materials for silver or gallium are mainly wet process. Metal silver is recovered through the process of acid leaching-precipitation enrichment-melting reduction-electrolysis. Gallium metal is recovered by electrodeposition after acid leaching or alkali leaching, extraction or ion exchange enrichment, but the main problems of the wet process are more acid consumption, long reaction time, and many...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C5/02C22B7/04C22B7/00
CPCC25C5/02C22B7/008C22B7/04C22B7/001Y02P10/20
Inventor 行卫东董惠赵振华朱刘
Owner FIRST RARE MATERIALS CO LTD
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