Shanghai Yong Ye Metallurgical Industry Development Co., LTD

Pyrometallurgy

Pyrometallurgy is under the condition of high temperature metallurgical process. Some or all of the minerals in the ore or concentrate at high temperature after a series of physical and chemical change, to generate another form of compound or simple substance, respectively enrichment in gaseous, liquid or solid products, achieve to extraction of metal from gangue and other impurities. Pyrometallurgy process needed to heat energy, usually rely on fuel combustion to supply, there are also by the chemical reaction in the process of supply, for example, that will not by the oxidation of sulfide ore roasting and melting of fuel heating; Metal thermal reduction process is also a hot. Pyrometallurgy includes: drying, baking, roasting, smelting, refining and distillation process, etc.

Hydrometallurgy

Hydrometallurgy is metallurgical process in solution. Hydrometallurgy temperature is not high, generally less than 100 ℃, high temperature and high pressure in the modern hydrometallurgy process, but also a temperature of 200 ℃ or so, rare circumstance temperature can reach 300 ℃ metallurgy. Hydrometallurgy include: leaching, purification, preparation of metal process.

Leaching processing of ore or concentrate with an appropriate solvent, make to extract metals into certain ions into the solution (cation or complex anion) form, the gangue and other impurities is insoluble, this process is called leaching. After leaching by the sink and filtering, leaching liquid containing metal (ions) and silk of gangue minerals into insoluble residue (leaching residue). For some difficult leaching of ores or concentrates, often need to prepare before leaching processing, easy extracted metals into a compound or salt leaching. Into soluble sulphate, for example, by the sulfating roasting, etc., are commonly used preparation methods.

1, The purification in the process of leaching, often have some metal or non-metal impurities with extracted metals into the solution, to remove these impurities from the solution process is called purification.

2, Preparation of metal product with substitution, reduction, etc. extracted from purifying liquid metal process.

Electrometallurgical

Electric metallurgical methods of extracting metals is the use of electricity. According to different use of electric energy effect, the electrometallurgical and divided into electric metallurgy and electrochemical metallurgy.

1, Electric, metallurgy is the use of electrical energy into heat energy for smelting method. Metallurgy in electrothermal metallurgy process, according to the nature of its physical and chemical change, little difference between with the process of pyrometallurgy, only the main difference when feeding smelting heat source.

2, Electrochemical, metallurgy (electrolytic and electrical product) is the use of electrochemical reaction, the metal from solution or melt containing metal salt precipitation. The former is called the electrolytic solution, such as the electrolytic refining of actinium and zinc electric product, can be included in the hydrometallurgy of; The latter is known as the molten salt electrolysis, not only using electricity chemistry, but also the use of electrical energy into heat energy, so as to heat the metal salts into the melt, it can also be included in the pyrometallurgy category. Extracting metals from ore or concentrate production process, often is both the fire process, wet process, even if the technological process of fire, for example, vulcanizing pot concentrates smelting method, finally also need a wet electrolytic refining process; In the wet zinc smelting, also need to use high temperature oxidizing roasting zinc sulfide concentrate on raw material pretreatment.