Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Iron group metal
Patent
1982-06-21
1983-02-15
Vertiz, O. R.
Chemistry of inorganic compounds
Treating mixture to obtain metal containing compound
Iron group metal
203 7, 252 80, 75119, 134 3, C01G 5300, C23F 1402
Patent
active
043741010
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 flushing the autoclave following completion of a leaching regime with a sulfuric acid solution containing about 20 to 100 gpl H.sub.2 SO.sub.4 at a temperature of about 150.degree. C. to 250.degree. C. and a pressure ranging from about 54 psig to 562 psig for a time sufficient to effect substantial removal of the scale.
REFERENCES:
patent: 3991159 (1976-11-01), Queneau et al.
patent: 4098870 (1978-07-01), Fekete et al.
Ratner, Z. L. et al, "Removal of Deposits From Autoclaves After the Sulfuric Acid Leaching of Oxidized Nickel Ores at the MOA Plant", (Gos. Inst. Proekt. Predpr. Nikelevoi Prom), 1969, USSR No. 42, 43-53, Abstracted in Chem. Abs. vol. 75-24,119v.
Boldt, Joseph R. Jr., The Winning of Nickel, Longsmans Canada Limited, Toronto, Canada, 1967.
Jha Mahesh C.
Lussiez Guy W.
Amax Inc.
Ciomek Michael A.
Kalil Eugene J.
Stoll Robert L.
Vertiz O. R.
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