The Emergence of New Hydrometallurgy Equipment from mixingtank's blog

Hydrometallurgy has evolved, both as an alternative to and a complementary method for the pyrometallurgical recovery of metals. It eases the recovery of value metals from ores containing impurities that can produce high-melting-point slags. It also makes it economically viable to recover metals on a smaller scale and from sulfide ores without producing acid. Hydrometallurgy provides for a more direct metal-recovery route, reducing working capital and enabling new methods that can recover metals now in scarce supply. Increased output with new Hydrometallurgy Equipment.

Today, refining of chalocopyrite concentrate is carried out almost exclusively using pyrometallurgical methods. However, with pyrometallurgical type refining an array of environmental and operational concerns must be addressed, including the elimination of pollutants in the sulfurous acid gas emitted during smelting at high temperatures and handling of the high-temperature melt . To overcome these demands, today attention is focusing on hydrometallurgical refining methods, and some processes have already been implemented in pilot tests or gone into operation on commercial scale.

The hydrometallurgical refining methods that presently exist are fraught with numerous disadvantages, however.
1) Production costs are higher than with pyrometallurgical refining.
2) The methods currently available must be used in tandem with existing processes.
3) The iron contained in the chalocopyrite concentrate is chemically less stable than the slag produced with pyrometallurgical refining, because it is recovered as goethite (iron hydroxide: FeOOH) or hematite (iron oxide: Fe2O3); moreover, it is generated in large quantities.
4) The recovery rate of precious metals is low.

Hydrometallurgy aims to compile studies on novel processes, process design, chemistry, modelling, control, economics and interfaces between unit operations, and to provide a forum for discussions on case histories and operational difficulties. Topics covered include: leaching of metal values by chemical reagents or bacterial action at ambient or elevated pressures and temperatures; separation of solids from leach liquors; removal of impurities and recovery of metal values by precipitation, ion exchange, solvent extraction, gaseous reduction, cementation, electro-winning and electro-refining; pre-treatment of ores by roasting or chemical treatments such as halogenation or reduction; recycling of reagents and treatment of effluents.

You can click Concentration Equipment for more information.

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By mixingtank
Added Aug 22



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