Refining slag is an indispensable additive in steel plants, and is used by the classification and characteristics of large refining slags in steel plants. Here we Bontrue Materials briefly introduces the classification and characteristics of refining slag. Commonly used refining slag types are: from the chemical composition of the refining slag, mainly CaO-CaF2 base, CaO-Al2O3 base, CaO-Al2O3-SiO2 base, etc.; from the production form of the refining slag, there are mixed slag, sintered slag, and pre-melted slag.
What is mixed refining slag:
Mixed refining slag refers to the direct manual or mechanical mixing of a certain proportion and particle size of the raw materials or the direct addition of the raw materials to the steelmaking furnace in proportion. The common forms of use include ① the raw materials are used directly before being transported to the furnace; ② are mixed first, then used; ③ used after making agglomerates or pellets.
What are the characteristics of mixed refining slag:
(1) The production method is simple and the cost is low; (2) When the raw materials are transported to the furnace for direct use, the refining process can change the addition ratio of various raw materials and the classification of the number of refined slags according to the slag condition in the refining process and the refining requirements. Features, flexible operation; (3) The melting speed is slow, the composition is uneven, and it is easy to absorb moisture. Classification and characteristics of refining slag
What is sintered refining slag: Sintered refining slag refers to a refining slag that is mixed with raw materials in a certain proportion and particle size, heated below the melting point of the raw materials to sinter the raw materials together, and then crushed into the required particle size for use.
What are the characteristics of sintered refining slag? Compared with mixed-type refining slag, the composition of sintered refining slag is more uniform and stable, and the melting speed is faster, but the cost is relative to the classification and characteristics of refining slag, and because the sintering slag has low density and more pores, it is easy to cause gas in the refining process.
What is pre-melted refining slag? Pre-melted refining slag refers to the refining slag that is mixed with the raw materials in a certain proportion, melted into a liquid state at a temperature higher than the melting point of the slag system at a high temperature in a special equipment, cooled and broken, and then used in the steelmaking process.
What are the characteristics of pre-melted refining slag? (1) The slag has high purity, uniform chemical composition, stable phase, low melting point, and fast slag formation speed, which can greatly shorten the refining time and can be directly used for slag washing in the converter ladle tapping process to improve the cleanliness of molten steel (2) The classification and characteristics of fluorine-free or less refined slag contains fluorine, which reduces the corrosion of the furnace lining and effectively prevents the pollution of the environment by fluorine; (3) The structure is compact, does not absorb water, is convenient for storage and transportation, and does not powder or volatilize , Can significantly reduce dust pollution to steel plants; (4) Higher production costs.