Preparation method of white slag admixture

Abstract

The invention relates to the field of resource utilization of solid wastes and environmental protection and energy conservation, in particular to a preparation method of a white slag admixture. The white slag admixture is prepared from the following raw materials in percentage by mass: 20-40% of slag, 50-60% of white slag and 10-20% of nickel slag. The preparation method comprises the following steps: adding the raw materials into a ball mill, and carrying out ball milling by using graded steel balls to obtain a series of powder with different grain sizes, wherein the grain size of the gradedsteel balls is 40-100mm. Self activity of the powder with small grain diameters can be greatly improved, and the powder with large grain diameters can fill concrete pores as much as possible. The graded steel balls strengthen the mutual grinding effect of the raw materials, so that performance advantages of the components are fully exerted, and energy consumption is effectively reduced.

Description

technical field [0001] The invention relates to the fields of resource utilization of solid waste and environmental protection and energy saving, in particular to a preparation method of white slag admixture. Background technique [0002] White slag refers to the slag formed when carbon powder, ferrosilicon powder and other reducing agents are used for diffusion deoxidation during the reduction period of electric arc furnace steelmaking. It is in the form of white powder after cooling in air and pulverized. With the development of our country's extra-furnace refining technology, the amount of white slag is increasing year by year. The accumulation of a large amount of white slag not only occupies a lot of land but also causes serious environmental pollution. [0003] The composition of white slag includes: CaO 50% ~ 60%; MgO 5% ~ 10%; Al 2 o 3 3%~6%; SiO 2 10%~20%; CaF 2 3%~10%; CaS 1%~3%; FeO<0.5% and a small amount of Cr 2 o 3 and P 2 o 5 and other oxides. S...

AI Technical Summary

Problems solved by technology

However, the white slag is refined, has low activity and high calcium oxide content, and it is directly used in admixtures, which is harmful to the strength and stability of concrete.

The silicon oxide in white slag has high hardness and is difficult to grind, especially when white slag is used as the main raw material, the effect of grinding alone or mixed with slag is not ideal

[0004] In the prior art about the resource utilization of white slag, the Chinese patent application number 201310139534.8 discloses a preparation method of titanium white slag concrete admixture, in which all raw materials are ground to a specific surface area of ​​450-500m 2 / kg ultra-fine powder, the implementation is difficult and the energy consumption is high

The invention patent with application number 201210043069.3 discloses a modified slag composite admixture and its preparation method, in which the amount of white slag added is only 5-10%, which is poor in economy and utilization

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