hydrometallurgy definition

hydrometallurgy means any processing of an ore or concentrate that produces a metal, metallic salt or metallic compound by carrying out a chemical reaction in an aqueous or organic solution;
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hydrometallurgy means that phase of metallurgy which involves the extraction and recovery of metals using aqueous or organic solutions, and "pyrometallurgy" means that phase of metallurgy which involves the extraction and recovery of metals using heat. The unit processes of hydrometallurgy include the leaching of ores or concentrate for recovery of metals, the separation of the leaching solution from the spent ore, and the recovery of the dissolved metal from the leaching solution. The allowable charges in determining the Net Return Value of Products recovered in a hydrometallurgical process or a combination hydrometallurgical and pyrometallurgical process are limited to the following:
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hydrometallurgy means that phase of metallurgy which involves the extraction and recovery of metals using aqueous or organic solutions, and "pyrometallurgy" means that phase of metallurgy which involves the extraction and recovery of metals using heat. The unit processes of hydrometallurgy include the leaching of ores or concentrate for recovery of metals, the separation of the leaching solution from the spent ore, and the recovery of the dissolved metal from the leaching solution. The allowable charges in determining the net return value of metallic minerals and associated mineral products recovered in a hydrometallurgical process or a combination hydrometallurgical and pyrometallurgical process are limited to the following: charges attributable to recovery of dissolved metal from the leaching solution by chemical purification, pressurization, roasting of concentrate, melting of concentrate, filtration, absorption, solvent extraction, evaporation, distillation, electrolysis, ion exchange, or precipitation. The charges attributable to the direct leaching of ores for recovery of metals, or to the separation of the leaching solution from the spent ore, are nonallowable charges.
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