Method using high magnesium phosphorus gangue smelting reduction to prepare metal magnesium

Abstract

The invention discloses a method using high magnesium phosphorus gangue smelting reduction to prepare metal magnesium, which comprises the following steps of (1) calcining high magnesium phosphorus gangue into high magnesium phosphorus gangue calcined dolomite at the temperature of 900 DEG C to 1200 DEG C; (2) burdening the high magnesium phosphorus gangue calcined dolomite, ferrosilicon alloy, alumina and silica according to certain mass percent, and mixing evenly to obtain mixed materials; and (3) adding the mixed materials in a reduction reactor to perform smelting reduction reaction at the certain temperature and pressure, and collecting condensed magnesium vapor generated in reaction to achieve metal magnesium. The method has the advantages of being low in cost of raw materials, easy to operate reaction and high in metal magnesium recycling rate, turning waste into wealth, well recycling magnesium resource in the high magnesium phosphorus gangue and having obvious economic and environmental benefits.

Description

Technical field [0001] The invention relates to the technical field of metallurgy, in particular to a method for preparing metallic magnesium by smelting reduction using waste high-magnesium phosphate tailings as raw materials. Background technique [0002] Phosphate rock is an important mineral resource, mainly used to produce phosphoric acid and phosphate fertilizer and phosphate products. Since most of our country’s phosphate rock is low- and medium-grade phosphate rock, chemical flotation is generally required to be enriched into commercial phosphate concentrate. At the same time, a large amount of phosphorus, magnesium, and calcium-containing phosphorus tails are produced during the flotation process. Mine, each ton of phosphate concentrate produced will produce about 0.3 tons of phosphate tailings. Generally it will be calculated as a percentage by weight: P 2 O 5 Phosphate tailings containing 2%-9%, MgO 16%-21% and CaO 28%-38% are called high-magnesium phosphate tailings....

AI Technical Summary

Problems solved by technology

[0005] The problems of this method are high energy consumption, slow solid-solid reaction speed, low recovery rate of metal magnesium, materials need to be made into agglomerates, etc.

Although these methods have their own characteristics, none of these methods involve the technology of using high-magnesium phosphorus tailings smelting reduction to prepare metal magnesium.