23 research outputs found
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A study of India's balance of payments during 1901-13 and 1924-36
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Report on the socio-economic survey of the Nagarjuna Sagar project area. Vol. II: Technical report
Some Economic Aspects of Nutritional Deficiency: A Case Study of a Small Town in Andhra Pradesh
The Role of Solids Characterisation Techniques in the Evaluation of Ammonia Leaching Behaviour of Complex Sulphides
Pressure leaching of copper converter slag using dilute sulphuric acid for the extraction of cobalt, nickel and copper values
In our earlier studies [1-4], conditions were optimized for leaching converter slag with ferric chloride/dilute sulphuric acid for the recovery of cobalt, nickel and copper. By using both leachants most of the copper, nickel and cobalt values could be solubilized. Subsequent treatment of the leach liquors for separation and recovery of metals was difficult due to the presence of large quantities of iron in relation to other metal concentrations. In the present work, an attempt has been made to develop a process based on pressure leaching of the slag with dilute sulphuric acid in which iron contamination could be minimized by oxidation and hydrolysis. Various parameters including leaching time, pulp density, particle size, concentration of acid and oxygen partial pressure were studied to optimize the solubility of metal values. Under optimum conditions about 90% copper and more than 95% each of nickel and cobalt could be extracted with only 0.8% extraction of iron