Chemical dissolution of scale formed during pressure...

Details Chemical dissolution of scale formed during pressure... Chemical dissolution of scale formed during pressure...

C - Chemistry, Metallurgy

23

G

149/12, 53/304

C23G 1/02 (2006.01) C01F 7/26 (2006.01)

Patent

CA 1190128

ABSTRACT In the high-pressure sulfuric acid leaching of nickeliferous oxide and silicate ore, there is a tendency for the formation of scale on autoclave surfaces. The scale comprises oxides and sulfates of metals selected from the group consisting of aluminum, iron, silicon and magnesium. The scale is chemically removed by flush- ing the autoclave following completion of a leaching regime with a sulfuric acid solution containing about 20 to 100 gpl H2SO4 at a temperature of about 150°C. to 250°C. and a pressure ranging from about 54 psig to 562 psig for a time sufficient to effect substantial removal of the scale.

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