Chemistry: physical processes – Physical processes
Patent
1973-07-30
1976-08-10
Emery, Stephen J.
Chemistry: physical processes
Physical processes
23305R, 23273SP, 423510, 75134H, 156616R, 156605, C01B 1900
Patent
active
039739171
ABSTRACT:
The present invention relates to a method and apparatus for purifying selenium or its alloys by precipitation. The method is characterized in that a smaller portion of a larger amount selenium or selenium alloy is kept at the respective transition temperature between solid and liquid phases while the remaining portion is maintained at a higher temperature for a time sufficiently long to allow a substantial concentration of foreign elements in the smaller portion.
The apparatus is characterized in that it consists of a glass vessel having a height approximately 10 times its diameter, provided with temperature indicators governing devices controlling the heat supplied to electrical elements arranged around the vessel, it also being provided with a tightly-fitting hood and a gas evacuation device.
REFERENCES:
patent: 651826 (1900-06-01), Coleman
patent: 1863346 (1932-06-01), Moore
patent: 2554425 (1951-05-01), Storment
patent: 2739046 (1956-03-01), Pfann
patent: 2739088 (1956-03-01), Pfann
patent: 3378409 (1968-04-01), Hurle
patent: 3453370 (1969-06-01), Kennedy
The Electrochemical Society, Escoffery et al., 1946, pp. 127 to 137.
Boliden Aktiebolag
Emery Stephen J.
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