White slag recovery treatment method

Abstract

The invention provides a white slag recovery treatment method which comprises the following steps: mixing liquid converter slag and liquid white slag, controlling the alkalinity of mixed slag obtained after mixing to be 2.5-4.5, controlling the content of calcium oxide in the mixed slag to be 40-55 wt%, and then solidifying and cooling the liquid mixed slag; the components of the white slag are adjusted through the slag mixing process, so that the alkalinity of the mixed slag is small, the content of free calcium oxide in the mixed slag is small, the content of iron oxide in the mixed slag is increased, and the problems of automatic pulverization and over-serious pulverization of the white slag in the cooling process are solved; the method has the advantages that the defect that fine powder formed after the white slag is pulverized is easy to pollute the environment is overcome, the cooled mixed slag has high adhesiveness, the cooled mixed slag can be used as a building material, wide application of the white slag is obviously promoted, and treatment and recycling application of the white slag are achieved.

Description

technical field [0001] The invention relates to the technical field of iron and steel metallurgy, in particular to a method for recycling and treating white slag. Background technique [0002] After the converter is tapped, the molten steel is refined outside the furnace and then sent to the continuous casting machine. After pouring, the remaining steel slag becomes basic slag. The basicity of the basic slag is between 3 and 7, and FeO in the slag After cooling, it turns into white powder, which is white slag. The reason why the white slag becomes powder is because the orthosilicate (2CaO·SiO 2 ) when cooled to 850°C, allotropic transformation occurs, from α lattice to γ ​​lattice, and the volume increases, resulting in automatic bursting and pulverization. [0003] Since the white slag is pulverized into a fine powder, it is very easy to cause environmental pollution and has no adhesiveness, so it cannot be applied to building materials, resulting in no effective method f...

AI Technical Summary

Problems solved by technology

[0003] Since the white slag is pulverized into fine powder, it is easy to cause environmental pollution and has no adhesion, so it cannot be applied to building materials, resulting in no effective treatment and application of white slag.