Metal heat treatment is one of the important processes in mechanical manufacturing. Compared with other processing technologies, heat treatment generally does not change the shape and overall chemical composition of the workpiece, but endows or improves the performance of the workpiece by changing the microstructure inside the workpiece or the chemical composition on the surface of the workpiece.
Its characteristic is to improve the internal quality of the workpiece, which is generally not visible to the naked eye. In order to make the metal parts have the required mechanical, physical and chemical properties, in addition to the reasonable selection of materials and various forming processes, heat treatment process is often essential. Steel is the most widely used material in mechanical industry.
The microstructure of steel is complex and can be controlled by heat treatment, so the heat treatment of steel is the main content of metal heat treatment. In addition, aluminum, copper, magnesium, titanium and their alloys can also change their mechanical, physical and chemical properties through heat treatment to obtain different service properties.
Sintering is one of the main methods to make iron (fine) ore lump which can not be directly added into blast furnace.
The metallurgical properties of raw materials can also be improved by sintering. Sintering is also used in the smelting process of non-ferrous metals.
In addition to agglomerating, the sintering of nonferrous sulfide concentrate also has the function of desulfurization.
Sintering technology was introduced in 1911, when the main purpose was to use the waste from iron and steel plants. With the improvement of beneficiation and blast furnace ironmaking requirements for fine materials, sintering production has developed rapidly since the 1950s.
Sintering is to mix the iron concentrate obtained from the beneficiation of lean iron ore, the powder obtained from the crushing and screening of rich iron ore and the iron containing powder, flux and fuel recovered in the production according to the required proportion, add water to make the granular sintering mixture, lay it on the sintering machine, and then sinter it into blocks through ignition and air extraction.
In the production of sinter, sinter plates, rotary kilns and suspension sintering have been used before, and now belt sintering machines are used. The latter has high output and good quality
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