A kind of magnesium slag granulation method

Abstract

The invention provides a magnesium slag granulation method, which comprises the following steps of 1, mixing waste and abandoned glass and borax according to a mass ratio of (20 to 50):1; then, performing crushing and ball milling on the mixed material to obtain a magnesium slag optimizing agent; 2, using calcined dolomite, a silicon iron reducing agent, a mineralizer as metallic magnesium production raw materials; adding a certain amount of magnesium slag optimizing agent into the metallic magnesium production raw materials; performing uniform mixing to form a mixed material; 3, putting the mixed material into a reduction tank; smelting magnesium according to a Pidgeon process; in the magnesium smelting process, separating out metallic magnesium in a steam form; the waste slag is coated with a liquid phase formed by the magnesium slag optimizing agent; a hard shell body is formed after natural cooling; granulous magnesium slag is finally obtained. The method provided by the inventionhas the advantages that the process is simple; the cost is low; the granulation and agglomeration of the magnesium slag are completed in one step in the metallic magnesium smelting process; meanwhile,the consumption of the mineralizer can be reduced.

Description

technical field [0001] The invention relates to the technical field of resource utilization of solid waste, in particular to a magnesium slag granulation method. Background technique [0002] my country is the world's largest producer of magnesium metal. In recent years, my country's magnesium output has reached more than 70% of the world's total. my country's Ningxia, Shaanxi, Shanxi and other provinces are the main magnesium metal producers, and most of the current The production of metal magnesium all uses the Pidgeon method, and the Pidgeon method for smelting magnesium is currently the most mature method. The raw materials used in the Pidgeon method for smelting magnesium are dolomite and ferrosilicon as a reducing agent, and the calcined dolomite is mixed with ferrosilicon, and then mixed with mineralizer (CaF 2 ) according to the proportion of grinding, mixing and pressing into balls, and then put the balls into the reduction tank, after high temperature and high vacu...

AI Technical Summary

Problems solved by technology

[0005] The patent document with the application number CN201110027740.0 adopts the method of adding a small amount of boric acid into the magnesium slag, and then roasting the powdered γ-C 2 S converted to β-C 2 S, to obtain bulk waste slag, which improves the volume stability of magnesium slag by chemical methods. This method is based on the magnesium slag produced after the Pidgeon method of magnesium smelting, and needs to be calcined after the addition of modifiers, which greatly increases The cost of resource utilization of magnesium slag is reduced; the patent document whose application number is CN200910020830.X adopts the method of adding 3-15% aluminum-containing raw material additives in the raw material for producing magnesium metal, and then quenches the magnesium slag after calcining to obtain Bulk magnesium slag, but in my country's Pidgeon process magnesium smelting plant, it is still unable to achieve full automation. The current slag extraction still uses mechanical equipment as the main method, and artificial methods as the auxiliary method. The rapid cooling method is difficult to achieve large-scale industrial application.