Pidgeon magnesium smelting process and applications by taking rare earth oxide (REO) as mineralizer

Abstract

The invention relates to a pidgeon magnesium smelting process and applications by taking rare earth oxide (REO) as a mineralizer. The pidgeon magnesium smelting process is characterized by comprising the following steps: carrying out metering and compounding by taking calcined dolomite as raw materials and silicon iron as a reducing agent together with mineralizer, wherein the mineralizer comprises rare earth oxide accounting for 0.25-3% total weight of pellet, the silicon iron accounts for 12-18% total weight of pellet, and the balance is the calcined dolomite; and grinding and then briquetting to be packed into a reducing tank, heating to be 1150-1250 DEG C, vacuumizing the interior, preserving temperature, cooling and collecting rough magnetism. According to the technical scheme, fluorite is entirely replaced by the rare earth oxide, so that the pollution of fluorine to the environment is reduced, and the existing equipment and process conditions are not required for changing; secondly, the modified magnesium slag has better gelatinization activity, the addition proportion of the magnesium slag applied in the cement and concrete building blocks can be increased, the magnesium slag utilization rate is high, the prepared building materials has high later strength, and the dual effects of being energy-saving and environment-friendly can be achieved.

Description

technical field [0001] The invention relates to a Pidgeon process for smelting magnesium and the application of rare earth oxides as mineralizers. Background technique [0002] Metal magnesium and magnesium alloys are new materials that my country has focused on developing in recent years, and are widely used in aerospace, automobiles and motorcycles, 3C products, medical care and other fields. Ningxia is one of the world's major producers of magnesium and magnesium alloys, and has been listed as a "National Pidgeon Magnesium Demonstration Base" and a "National High-quality Magnesium Alloy Industry Base". The Pidgeon method of magnesium smelting is a relatively mature method, which produces a large amount of magnesium, usually 6-8 tons of reduced slag will be produced per ton of magnesium produced by the Pidgeon method. Especially air pollutant CO 2 , SO 2 , HF and other gas emissions are serious, which has attracted extensive attention. During the stacking and transport...

AI Technical Summary

Problems solved by technology

For example, the Chinese patent application with application number 201110027740.0 (publication number: CN102071327A) adopts the method of adding a small amount of boric acid, solves the stability problem of magnesium slag by chemical method, but does not change the mineralizer fluorite of magnesium refining; and application number 200910020830. The Chinese patent application of X (publication number: CN101457306A) adopts the additive of adding aluminum-containing raw materials to carry out magnesium slag modification, but it is only used as a modifier for magnesium reduction slag