The premelting calcium aluminate refining slag for steel plant is sintered and melted in a cupola by using limestone (including CaO), magnesite (including MgO), dolomite (including CaO•MgO), witherite (including BaO) and fluorite (including CaF2). made. This slag has a very low melting point and can be melted at the fastest speed, shortening the residence time of molten steel in the refining ladle and strengthening the smelting process. At the same time, this refining agent has good fluidity, optimizes the kinetic conditions of the desulfurization reaction, and can achieve deep desulfurization.

At present, pre-melting refining slag can be produced by electric furnace, pilot-fired kiln, rotary kiln, horseshoe kiln, and cupola furnace for chemical iron. Different production methods and processes have an important impact on the quality of pre-melting slag.

Premelting type refining slag is mainly used for LF furnace, open-hearth, and converter ladle refining to remove impurities such as sulfur and oxygen in molten steel and reduce the content of harmful elements and impurities in the steel. It is suitable for plain carbon steel and high carbon steel. Steel, high and low alloy steel. It has long been used in foreign countries, such as South Korea, Japan, Europe and the United States, and other developed countries.

premelting calcium aluminate refining slag for steel plants has the following characteristics:

1. The chemical composition is uniform, the melting point is low, and the melting speed is fast, which can shorten the smelting time;

2. No fluorine, no erosion of furnace lining and ladle;

3. The structure is compact, does not absorb water, and is convenient for storage, transportation, and warehousing; due to the stable phase and fast slag formation, it can reduce the dust pollution of iron and steel plants and comprehensively stabilize the refining process;

4. It does not contain impurities such as hydrogen, nitrogen, and carbon, which is beneficial to improving steel quality.