C - Chemistry – Metallurgy – 25 – C
Patent
C - Chemistry, Metallurgy
25
C
204/163
C25C 1/16 (2006.01) C25C 7/00 (2006.01)
Patent
CA 1067454
ABSTRACT OF THE DISCLOSURE A method of cooling an electrolyte circulated for the electrowinning of zinc, comprising the steps of adjusting the pH value of a neutral leach solution to about 1 to 3 before being mixed with the circulating electrolyte, supplying a downward stream of the neutral leach solution in the form of a spray within a first gas-liquid contact type cooling tower, supplying an upward stream of cooling gas under pressure at a high speed from a lower part of the cooling tower in counter current relation with the downward stream of the neutral leach solution thereby subjecting balls of light weight packed within the cooling tower to floating and rotating movement for bringing the neutral leach solution into cooling contact with the cooling gas on the surface of the balls so as to cool the neutral leach solution while, at the same time, removing impurities depositing in gel form on the balls utilizing the self-cleaning action of the balls, adding the cooled neutral leach solution to supplement the part of the circulating electrolyte discharged from a cir- culating tank, and supplying a downward stream of the solution mixture in spray form within a second gas-liquid contact type cooling tower in counter current relation with an upward stream of cooling gas thereby subjecting similar balls to floating and rotating movement thereby cooling the solution mixture while removing impurities.
251688
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