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| STUDIES ON THE TWO-STAGE SULPHATING ROASTING PROCESS |
| TAN CHING-LIN; WANG YUNG-LU(Institute of Preciou Metals; Academia Sinica) |
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Cite this article:
TAN CHING-LIN; WANG YUNG-LU(Institute of Preciou Metals; Academia Sinica). STUDIES ON THE TWO-STAGE SULPHATING ROASTING PROCESS. Acta Metall Sin, 1964, 7(2): 136-144.
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Abstract The two-stage sulphating roasting process is a modified process in which sulphuric acid is used as the sulphatizing agent. This process has been proposed for treating certain highly siliceous, low grade cobalt and copper oxide ores. As a result of such a treatment, over 90％ of cobalt and copper can be converted into water-soluble products while over 90％ of iron will be left insoluble during subsequent leaching. Taking advantage of rate tests, differential weight analysis as well as differential thermal analysis, the authors examined the necessity of carrying out the roasting process in two stages. In the first stage (230—300℃) the sulphatization of oxides on the one hand and the prevention of acid evaporation loss on the other should be both satisfied. The main reactions are (1) dehydration, (2) sulphatization of different oxides with acid vapor, and (3) partial decomposition of ferric sulphate. In the second stage (550—600℃) reaction between cobalt and copper oxides and SO_3 dissociated from iron sulphate is initiated. The temperature is controlled so as to reduce the decomposition of cobalt and copper sulphate to a minimum. Certain oxides, such as Fe_2O_3, Cu_2O, act catalytically in the reactions and have been found to lower appreciably the starting temperature of cobalt sulphate decomposition, while SiO_2, being neutral to SO_3, shows little effect.
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Received: 18 February 1964
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[6] Thornhill, P. G., Pidgeon, L. M.: J. Metals, 1957, 9, 989．
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[8] 苏鑑、段維垣等:某地含銅鈷土矿两段硫酸化焙烧半工业性試驗报告,1962年云南省金属学会年会論文.
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