Modifying method of quick lime for sintering

Abstract

The invention relates to a modifying method of quick lime for sintering. The modifying method comprises the following steps of (1) crushing quick lime which is not treated; (2) adding water to the quick lime which is crushed in the step (1), performing sufficient stirring, and then performing standing for 30-40min; (3) adding sodium hydroxide solid to a solution prepared in the step (2), and performing uniform stirring; (4) heating the solution prepared in the step (3) to 60-70 DEG C, and continuing performing stirring; (5) mixing sodium sulfide with water in the mass ratio of the sodium sulfide to the water being 1 to 100 so as to obtain a sodium sulfide aqueous solution; (6) uniformly adding the sodium sulfide aqueous solution which is prepared in the step (5) to the solution prepared inthe step (4); (7) charging carbon dioxide to the solution prepared in the step (6), after the solution become turbid, continuing charging the carbon dioxide until a clarifying layer appears at the upper layer of the solution; and (8) filtering the solution prepared in the step (7). According to steel products prepared from the modified quick lime, the mechanical property is obviously improved, the life is prolonged, and the steel products are excellent in quality and high in stability.

Description

technical field The invention relates to the technical field of quicklime modification, in particular to a method for modifying quicklime for sintering. Background technique Sintering is an important step for iron and steel enterprises to process iron concentrate, which can provide raw materials with good air permeability and qualified hardness for steelmaking. An appropriate amount of alkaline flux is usually added during sintering. One is to obtain sintered ore with a certain alkalinity, which reduces the proportion of flux added during smelting and improves the smelting intensity. Second, the alkaline flux can be combined with aluminum in iron concentrate. , Silicon and other acidic substances react to form substances with low melting points, so as to obtain a liquid phase at a reduced temperature and improve the strength and metallurgical properties of sintered ore. Alkaline fluxes include limestone, quicklime, dolomite, slaked lime, etc. Quicklime is widely used becau...

AI Technical Summary

Problems solved by technology

At present, most sintering plants do not modify the quicklime or the modification steps are simple, it is difficult to give full play to the performance of the quicklime

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