Method and apparatus for germanium reclamation from chemical vap

Details Method and apparatus for germanium reclamation from chemical vap Method and apparatus for germanium reclamation from chemical vap

1998-01-14

2000-04-25

Bos, Steven

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group iva metal

423 93, C01G 1700

Patent

active

060541040

ABSTRACT:
A continuous system recovers germanium (Ge) from a chemical vapor deposit. A chemical vapor deposit scrubber scrubs a chemical vapor deposit to form a chemical vapor deposit scrubber solution. An equalization and neutralization mixer adds a caustic soda to the chemical vapor deposit scrubber solution to form an equalization and neutralization mixer solution having a pH above 12.0 to maintain the solubility of silicon oxide (SiO.sub.2) and hypochlorite (ClO.sup.-). A hypochlorite reduction mixer adds a peroxide to the equalization and neutralization solution to form a hypochlorite reduction solution to reduce hypochlorites. A precipitant and neutralization mixer adds a metal cation such as Epsom Salts (MgSO.sub.4) and a caustic soda, such as sodium hydroxide (NAOH), to the hypochlorite reduction solution to form a precipitant and neutralization solution to precipitate magnesium germanate (MgGeO.sub.3) and magnesium metasilicate (MgSiO.sub.3). A reactor tank adds a polymer to the precipitant and neutralization solution to flocculate the germanium (Ge) and silicon (Si) solids and form a flocculation solution. A plate clarifier collects the flocculation solution to form a flocculated material. A filter press and the dryer produces a dry sludge of germanium (Ge) within a range of 5%-10% by weight.

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patent: 4554078 (1985-11-01), Huggins et al.
patent: 4578253 (1986-03-01), Gill et al.

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