Method of purifying by-product gypsum

Details Method of purifying by-product gypsum Method of purifying by-product gypsum

1984-03-02

1986-09-16

Straub, Gary P.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Alkaline earth metal

423555, 423490, 106109, 210724, C01F 1146, C01F 1108, C04B 1100, B01D 2101

Patent

active

046121730

ABSTRACT:
Disclosed is a method of purifying by-product gypsum by making it into a sludge and washing the sludge in a single, multi-stage filtering washer. The washing liquid is recovered from the filtrate from the first stage of the washer and subject to neutralization in a two-stage neutralizing unit. The sludges separated in the neutralizing unit are dried and the excessive washing liquid from the second stage of the neutralizing unit is further processed in an evaporation stage.

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patent: 4145282 (1979-03-01), Bruckenstein
patent: 4171342 (1979-10-01), Hirk et al.
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patent: 4472368 (1984-09-01), O'Neill et al.
Olsen, Unit Processes and Principles of Chemical Engineering, 1932, pp. 1-3, D. Van Nostrand Co. Inc..

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