Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Iron group metal
Patent
1982-02-26
1983-08-16
Vertiz, O. R.
Chemistry of inorganic compounds
Treating mixture to obtain metal containing compound
Iron group metal
423150, 203 7, C22B 300, C01G 5311
Patent
active
043991092
ABSTRACT:
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 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 following 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.
REFERENCES:
patent: 3734835 (1973-05-01), Spicacci
patent: 3991159 (1976-11-01), Queneau et al.
patent: 4044096 (1977-08-01), Queneau et al.
patent: 4098870 (1978-07-01), Fekete et al.
patent: 4247371 (1981-01-01), Roller
Cooperrider Mark W.
Iler Ralph K.
Queneau Paul B.
Ciomek Michael A.
Compagnie Francaise d'Entreprises Minieres, Metallurgiques et
Kalil Eugene J.
Stoll Robert L.
Vertiz O. R.
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