Specialized metallurgical processes – compositions for use therei – Processes – Electrothermic processes
Patent
1984-02-06
1986-10-28
Carter, H. T.
Specialized metallurgical processes, compositions for use therei
Processes
Electrothermic processes
423 53, 423242, 423244, C01G 3700, C22B 100
Patent
active
046196900
ABSTRACT:
Disclosed is a process for beneficiating chromite ore. The process can also be used to remove SO.sub.2 from SO.sub.2 -air mixtures which would ordinarily be vented. The chromite ore is pulverized and preferably mixed with sodium sulfate. Ammonium carbonate can also be added for subsequent vaporization to increase porosity. Sulphur oxide-oxygen roasting of the chromite ore is conducted at elevated temperatures in the approximate range between 300.degree. and 1,000.degree. C. or higher at approximately atmospheric pressures. After roasting, the ore is preferably leached using an aqueous ferric sulfate solution to remove soluble undesired constituents from the roasted chromite ore. The beneficiated chromite ore shows improved chromium concentrations and chromium to iron ratios when compared to the original ore.
REFERENCES:
patent: 4464344 (1984-08-01), Saikkonen
"Chemical Upgrading of Stillwater Chromite" Dwight L. Harris, Transactions of Society of Mining Engineers, Sep. 1964, pp. 267-281.
DeMatos and Peres Abstract.
"A Review of the Deposits and Beneficiation of Lowergrade Chromite", Ralph H. Nafziger, Journal of South African Institute of Mining and Metallurgy, Aug. 1982, pp. 250-226.
"The Role of Alkali Sulphates in Promoting the Sulphation Roasting of Nickel Sulphides", A. W. Fletcher and M. Shelef, Unit Processes in Hydrometallurgy, Milton E. Wadsworth and Franklin T. Davis, editors, Metallurgical Society Conferences, vol. 24, pp. 946-970.
Omofoma Matthew A.
Taylor Patrick R.
Carter H. T.
Idaho Research Foundation Inc.
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