Light magnesium oxide double-reduction carbonization preparation method

Abstract

The invention relates to a light magnesium oxide double-reduction carbonization preparation method which comprises the following steps of sequentially performing nitrification, carbonization, primaryfilter pressing, decomposition, secondary filter pressing and calcining to obtain light magnesium oxide with CaO content being smaller than 0.05 percent, Fe content being smaller than 0.01 percent andMgO content being larger than 99.5 percent, wherein raw materials are selected from one or more of dolomite, heavy magnesium oxide, brucite and magnesium hydrate. The light magnesium oxide double-reduction carbonization preparation method provided by the invention has the advantages that the process of the traditional technology is shortened, high-energy consumption and high-pollution equipment are canceled, investment is reduced, the production cost is reduced and the problem that hot water cannot be wholly recycled in the traditional carbonization method is solved; by adopting the light magnesium oxide double-reduction carbonization preparation method, as for magnesium oxide products per ton, the coal consumption is 2-3T, and compared with the traditional technology, the electricity consumption is reduced by 50 percent, and the water for production is reduced by 40-50 percent and can wholly recycled; and the quality of the prepared light magnesium oxide is stable.

Description

technical field [0001] The invention relates to the technical field of magnesium oxide preparation, in particular to a double carbon reduction preparation method of light magnesium oxide. Background technique [0002] Light magnesium oxide is widely used in surface coating, papermaking, metallurgy, ceramics and refractory materials and other fields. The methods for producing high-purity magnesium oxide mainly include brine-limestone (dolomite) method, brine-ammonification method, brine-soda ash method, brine-ammonium bicarbonate method, dolomite-carbonization method, etc. Due to the defects of high energy consumption and high pollution of the dolomite carbonization process, the development of carbonization products and the utilization of ore resources are limited, and many enterprises that adopt the dolomite carbonization process have ceased production in recent years. In order to meet the market demand for carbonization products, it is urgent to improve the carbonization p...

AI Technical Summary

Problems solved by technology

[0003] Aiming at the defects in the prior art, the purpose of the present invention is to provide a double decarburization preparation method of light magnesium oxide, which shortens the process, cancels high energy consumption and high pollution equipment, reduces investment, reduces production costs, and solves the problem of It solves the problem that hot water cannot be fully recycled in the traditional carbonization method; for each ton of magnesia products, the coal consumption is 2-3 tons, the power consumption is reduced by 50% compared with the traditional process, the production water is reduced by 40%-50%, and all can be recycled Utilization; the quality of the prepared light magnesium oxide is stable, fully complying with the technical requirements of class I and class II superior products of HG / T 2573-2006 "Industrial Light Magnesia"

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