C - Chemistry – Metallurgy – 01 – F
Patent
C - Chemistry, Metallurgy
01
F
23/224, 23/397
C01F 5/10 (2006.01) B01J 8/20 (2006.01) C01B 13/18 (2006.01)
Patent
CA 1115028
ABSTRACT OF THE DISCLOSURE The present invention provides a process for the recovery of metal oxides from contaminated starting materials on an indus- trial scale, in which the starting materials are dissolved in hydro- chloric acid and from the brine thus obtained pure metal oxide and hydrogen chloride are formed by thermal decomposition of the brine in a decomposition furnace after pretreatment of said brine, in which pre-treatment the brine is concentrated by intimate contact with waste gases containing hydrogen chloride from the decomposition furnace the improvement in which the brine to be concentrated is sprayed in a spraying zone in a stream of the waste gas, brine droplets so produced are collected after having passed through the stream of waste gases, and at least a portion of the brine so collected is sprayed at least once in the stream of waste gas and collected after having passed through the stream of the waste gas and fed into a common discharge of the concentrated brine, the pH- value of the discharging concentrated brine being maintained in a preselected range by controlling the amount of the brine subjected to said repeated spraying in the stream of waste gas.
309484
Grill Michael
Grohmann Helmut
Marks & Clerk
Veitscher Magnesitwerke-Actien-Gesellschaft
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