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The current technological challenges mean that engineers are expected to apply the available extraction in the field of extractive metallurgy. Extraction of copper, one of the most used metals, has been practiced since ancient times around the world. Three crucial steps, namely sulphide roasting, leaching of ores and concentrates, and electro-extraction through solvent extraction, are described here with ample details, diagrams, examples and explanations to enlighten practitioners. these techniques are widespread where copper ores are mined. These modes of extraction are applied in operations for many non-ferrous metals from where the interest of this book which enters in the collection of Extractive Metallurgy. Roger RUMBU, Met. Eng., PPM.
Copper hydrometallurgy is discussed with special reference to the treatment of chalcopyrite concentrates under South African conditions. The following processes are described and illustrated: Sherritt Gordon's ammonia pressure leaching, the Arbiter Process, sulphuric acid pressure leaching, roasting processes, the Cymet Process, and the ferric chloride process developed at the National Institute for Metallurgy. These processes are then compared with respect to the form of sulphur produced (elemental sulphur or sulphate), the character of the iron product, and the handling of different types of ore.
Hydroxyoximes and Copper Hydrometallurgy provides a current examination of what is known regarding hydroxyoxime extractants, the chemistry and physicochemistry of extraction, and the potential of applying hydroxyoximes for extraction of copper and other metals in industrial processes. Topics addressed include the development of the hydrometallurgical process, methods of synthesis and structural characteristics, extraction properties, losses of active substances and problems associated with environmental pollution, the potential of metal extraction and separation with hydroxyoximes, methods of extraction and stripping that can improve metal separation and recovery, the applications of hydroxyoximes in various membrane processes, and industrial processes and equipment used for processing oxide ores and tailing. The book will benefit metallurgists, hydrometallurgists, analytical and physical chemists, and researchers in mining industries and solvent extraction.
This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1912 edition. Excerpt: ...step. The production of ferric chloride at this point is advantageous in that it dissolves copper oxide, copper sulphide or metallic copper, which remained unaffected by the roasting, producing copper chloride, and this ferricchloride also maintains the copper chloride in the cupric condition. The gold and silver in the ore are brought into solution by converting all the copper into cupric chloride and then adding a small amount of chlorine, chlorous, or chloric compounds. The chlorides of silver and gold being soluble in calcium chloride solutions may afterward be precipitated with the copper and subsequently separated. After leaving the reaction drum the mass of gangue, solution, and precipitates is subjected to filtration. The solid matter forms a cake which consists of the gangue in the ore except a small amount of iron and alumina which have been taken into solution and the calcium sulphate precipitate already mentioned. The solution comprises a carrier in which has been dissolved the metals to be recovered, a small amount of iron and alumina and any zinc which may have been in the ore; the arsenic will have been separated by filtration, as it has been rendered insoluble. The solution is then subjected if necessary to a further oxidizing operation in order to be sure that the metals are all combined at their highest valency. The solution is then in condition for treatment for the separation of the dissolved metals. The precipitation of iron and alumina may be made by cupric oxide, hydrate or calcium carbonate, and as this precipitate will carry some copper it is returned to the amphidizer, or roasting furnace, after having been removed from the solution by filtration. In the amphidizer the iron and alumina in the precipitate are...
The hydrometallurgical papers of Volume IV highlight optimization efforts in solvent extraction/electrowinning operations in North and South America. Biohydrometallurgy, for example, not only takes a key role in copper recovery in many leach operations but offers a new role in cost-effective environmental remediation. The discussions of several approaches to the treatment of copper sulfide concentrates emphasize the high level of interest in finding alternative means of recovering copper and precious metals and avoiding many of the costs and impurity issues associated with the conventional processing.