What is leaching?

The desired product is extracted by the leaching solution (with monovalent metal or other impurities) in the process of solid material, i.e. a solvent fractionation process for the solid medium, usually depends participating in chemical reactions. The solid material here may be conventional materials such as metallurgical ores, concentrates, various intermediate products such as ice copper, calcine the like, may also be a solid waste such as slag, fly ash, anode mud, waste alloys. The purpose of the leaching operation varies depending on the materials to be treated. In most cases, valuable components are extracted from the processed materials such as ore, concentrate and secondary resources. In some cases, impurities are leached from the materials to purify the solid product. A noteworthy development trend is the use of leaching technology to treat solid waste and even contaminated soil, making it harmless and resourceful.

Leaching is a basic unit operation in hydrometallurgy and is characterized by:

(1) Leaching is a physical and chemical process carried out in a solution medium by means of a solution medium, in most cases.

(2) The leaching system is a heterogeneous reaction system involving a liquid phase, at least a solid-liquid multiphase system, and in some cases, a gas phase, such as a sulfurized mineral oxygen leaching. In fact, the solid itself is also a multi-component, multi-phase system.

(3) Leaching in hydrometallurgy is rarely a simple physical dissolution, accompanied by complex multiphase chemical reactions, and therefore requires not only certain leaching temperatures, pressures, and pH, but also electrochemical processes such as oxidation-reduction reactions. .

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