Preparation method for aluminum fluoride slugging agent

Abstract

The invention discloses a preparation method for an aluminum fluoride slugging agent. The method comprises the following steps: S1, weighing a certain amount of aluminum fluoride powder, fluorite powder, aluminum oxide powder, active calcium and a binding agent and mixing and stirring the same to obtain a mixture, wherein the mixture comprises the following components in parts by weight: 20-40 parts of aluminum fluoride powder, 30-60 parts of fluorite powder, 20-40 parts of aluminum oxide powder, 10-20 parts of active calcium and 3-5 parts of a binding agent; S2, adding the mixture into a furnace to be pre-melted at a high temperature; S3, crushing the product in the S2 by using a crusher; and S4, screening the product in the S3 according to grain size. The method is simple and feasible. The prepared aluminum fluoride slugging agent as a fluxing material can improve the slugging efficiency of a metallurgical process, reduce the amount of slag, reduce the use amount of fluorite high in price in a slagging and smelting process of an electric furnace and a refining furnace, and lower the cost of a slugging agent. The amount of SiF4 toxic gas generated is reduced, and environmental protection is facilitated.

Description

technical field [0001] The invention relates to the field of metallurgical engineering, in particular to a method for preparing a fluoride-aluminum slag agent. Background technique [0002] In the process of steelmaking, it is necessary to melt the slag at the same time, so that the slag has the appropriate alkalinity, oxidation and fluidity as soon as possible, so that the iron and steel smelting can be carried out as soon as possible. Fluorite is currently a commonly used fluxing slag agent. The main component is CaF2, which has a low melting point and has the characteristics of forming a low melting point eutectic substance with CaO and calcium silicate. For example, CaF2 and CaO eutectic at 1362 ° C, CaF2 and CaO, SiO2 The melting point of the ternary eutectic lance spar 3CaO·2SiO2·CaF2 is 1130°C, so fluorite has a strong role in helping to melt slag. In addition, fluorite can also destroy the network structure of silicon-oxygen complex ions in the silicate slag system,...

AI Technical Summary

Problems solved by technology

[0003] Traditional electric furnaces and refining furnaces generally use a single fluorite as a fluxing material in the process of slag making. The Ca component in it can achieve the purpose of rapid slagging, but it will corrode the furnace lining during long-term use and reduce the service life of refractory materials.

In addition, at high temperature, CaF2 will produce gas, pollute the environment, and cause harm to the human body, and because CaF2 is volatile at high temperature, the duration of the good slag removal effect is short