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Gallium Arsenide Waste Treatment Method

IP.com Disclosure Number: IPCOM000080638D
Original Publication Date: 1974-Jan-01
Included in the Prior Art Database: 2005-Feb-27
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Bell, HF: AUTHOR [+2]

Abstract

The use of standard treatment procedures on waste gallium arsenide solutions, results in erratic arsenic removal and removal of only 15 percent of the gallium in the waste. The procedure outlined below takes into account the presence of hypochlorite and carbonate in the waste liquid which cause the erratic results when the waste is treated in a normal fashion. 1) The alkaline waste is treated with 30% hydrogen peroxide to destroy all sodium hypochlorite present. 2) Concentrated hydrochloric acid is added to drop the pH to 4. 3) The solution is allowed to stand (with agitation) until the carbonate decomposes. 4) The pH is raised with lime (pH about 12) to precipitate the gallium and arsenic. 5) Ferric chloride is added at this point to aid in the precipitation process. 6) The material is filtered.

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Gallium Arsenide Waste Treatment Method

The use of standard treatment procedures on waste gallium arsenide solutions, results in erratic arsenic removal and removal of only 15 percent of the gallium in the waste. The procedure outlined below takes into account the presence of hypochlorite and carbonate in the waste liquid which cause the erratic results when the waste is treated in a normal fashion.
1) The alkaline waste is treated with 30% hydrogen peroxide

to destroy all sodium hypochlorite present.
2) Concentrated hydrochloric acid is added to drop the pH

to 4.
3) The solution is allowed to stand (with agitation) until

the carbonate decomposes.
4) The pH is raised with lime (pH about 12) to precipitate

the gallium and arsenic.
5) Ferric chloride is added at this point to aid in the

precipitation process.
6) The material is filtered.

1