Method for preparing calcium ferrite by using converter slag and improving sintering quality

Abstract

The invention discloses a method for preparing calcium ferrite by using converter slag and improving sintering quality. A mixed material formed by uniformly mixing converter slag and iron-containing minerals according to a certain proportion is put into an electric arc furnace In batches; firstly, a first batch of the mixed material is put in; the surface solidified shell of the mixed material ismelted by heating through the adoption of an electric arc heating method; a second batch of the mixed material are added after a molten pool is formed; after all the second batch of the mixed materialis melted, material charging is continued until all the mixed material is added and melted; and finally cooling is carried out to room temperature. Externally added calcium ferrite accounting for 0.2-10% by mass of whole sintering materials is utilized for improving the sintering quality. According to the invention, the converter slag generated by iron and steel enterprises is used as a raw material, CaO in the chemical components of the converter slag is recycled for preparing the calcium ferrite which is beneficial for sintering, and the low melting point property of the calcium ferrite isutilized, so that the consumption of sintering fuel is reduced, the sintering speed is improved, the cold strength of sintered ore is improved by 0.2%-1%, the sintering yield and quality indices are optimized, and support is provided for energy conservation, emission reduction and green development of the iron and steel enterprises.

Description

technical field [0001] The invention belongs to the technical field of steel slag comprehensive treatment, in particular to a method for preparing calcium ferrite by using converter slag and improving sintering quality Background technique [0002] With the emphasis on environmental protection at home and abroad, China has also introduced policies one after another, such as the tiered price of exhaust gas emissions and the improvement of testing standards for solid waste emissions, all of which have brought great pressure on environmental protection to various steel companies in China. , metallurgists have been committed to the development of environmentally friendly metallurgical solid waste recycling process. As a by-product of steelmaking, converter slag (about 80Kg per ton of steel) has been valued by various steel enterprises and metallurgists, and has become one of the research hotspots at home and abroad. [0003] Japan's K.Morita studied the recovery of P resources ...

AI Technical Summary

Problems solved by technology

[0005] To sum up, the existing mature converter slag magnetic separation and crushing process loses a part of iron elements, and CaO and other elements are not recovered and utilized at all. At the same time, the obtained fine powder is easily difficult to apply due to bursting when used in construction

However, the technology to be developed, such as the preparation of P fertilizer, is still immature, and there is still a long way to go before industrialization.

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