C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
53/304
C22B 3/00 (2006.01) C01G 51/10 (2006.01) C01G 53/10 (2006.01) C01G 53/11 (2006.01)
Patent
CA 1212840
ABSTRACT OF THE DISCLOSURE A method is provided for inhibiting the formation of silica scale on flash-pot surfaces during the multi-stage flashing of sulfuric acid pressure-leach slurry obtained following the continuous autoclave leaching of nickel lateritic ore at elevated temperature and pressure during which silica is dissolved, wherein the leach slurry is subjected to a high-temperature flash stage such that the slurry at the flash temperature is supersaturated in soluble silica, and wherein the slurry is thereafter subjected to at least one additional flash at an in intermediate-temperature flash stage at which silica precipitates and tends to form a scale accompanied by a decrease in said supersaturation. The improvement resides in recycling a substantial portion of the slurry to the intermediate-temperature stage follow- ing flashing to the intermediate-temperature flash stage, the portion recycled being sufficient to effect a dilution in silica concentration of the slurry being flashed into the intermediate-temperature flash stage from the high- temperature stage, and continuing the recycling of flashed slurry to the intermediate-temperature flash stage, whereby silica scale formation at the intermediate-temperature flash stage is greatly inhibited. The pH of the recycling stream may be adjusted to further minimize silica deposition.
422463
Cooperrider Mark W.
Iler Ralph K.
Queneau Paul B.
Compagnie Francaise D"entreprises Minieres Metallurgiques Et D'investissements
Hewitt Neville S.
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