Waste residue modification method for preparing magnesium metal by pidgeon process

Abstract

The invention provides a method for preparing modified magnesium metal waste residue by a Pidgeon process. The method comprises the following steps: adding an additive containing an aluminum raw material during mixing and milling a magnesium metal raw material for production to obtain an evenly mixed magnesium metal reduction material; allowing the added additive to react with the magnesium residue during the process of reducing the magnesium metal under a high-temperature vacuum condition to form gel mineral; collecting the magnesium metal and then quickly cooling the obtained modified magnesium residue; performing ball milling on the modified magnesium residue obtained by quick cooling to obtain modified magnesium residue mineral powder with the granularity of 45mum and the screen residue less than 12wt%; and taking the obtained powder as a high-activity magnesium residue concrete admixture or a cement composite material. The method has the advantages of simple process, wide variation range of additive amount, less effect on magnesium metal smelting production and low cost; furthermore, the magnesium residue modification process is adopted in the method, which causes the magnesium residue to be widely applied to the cement or the concrete, and causes high utilization rate of the magnesium residue, wide application, energy saving and environmental protection.

Description

technical field [0001] The invention belongs to the technical field of utilization of metallurgical waste slag, and in particular relates to a method for modifying metal magnesium waste slag prepared by Pidgeon method. Background technique [0002] As we all know, the Pidgeon method is a relatively mature method for smelting metal magnesium. The magnesium slag produced by this process method has a large amount. Usually, six to eight tons of waste slag will be produced for every ton of metal magnesium produced. If it is not used, not only pollute the environment and waste resources. [0003] The main components of metal magnesium slag are calcium oxide and silicon oxide, which are relatively close to the composition of blast furnace granulated slag. It belongs to alkaline slag and is suitable for use in the field of building materials. [0004] However, many studies have shown that although magnesium slag contains relatively high calcium oxide, usually about 50% by weight, i...

AI Technical Summary

Problems solved by technology

Most of the other magnesia slags are used to make bricks. Although magnesia slags are better utilized, the economic benefits are not high.

[0007] Domestic scholars have attempted to replace silicon-aluminum alloys with silicon-iron alloys for the reduction test of metal magnesium (application number 200410020666.X), which can improve the comprehensive utilization of magnesium slag in theory, but there is no research content on the utilization of this type of magnesium slag.