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A method for dual utilization of low-grade magnesite magnesium and carbon

A magnesite, low-grade technology, applied in chemical instruments and methods, magnesium halide, magnesium chloride, etc., can solve the problems of low comprehensive utilization of resources and restoration of vegetation in mines

Active Publication Date: 2018-12-18
SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
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Problems solved by technology

The problem of mine vegetation restoration is serious, and the comprehensive utilization of resources is not high

Method used

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  • A method for dual utilization of low-grade magnesite magnesium and carbon
  • A method for dual utilization of low-grade magnesite magnesium and carbon
  • A method for dual utilization of low-grade magnesite magnesium and carbon

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Effect test

Embodiment approach

[0043] (1) Weigh 100g of low-grade magnesite flotation tailings powder, pour it into a 500ml beaker together with 300ml of deionized water, stir well, pour it into a 500ml three-necked flask, and measure the concentrated sulfuric acid with a graduated cylinder Take 100 ml, dilute to 50% (mass ratio), start stirring at 300 rpm, heat up to 85°C-120°C, and react for 2-5 hours.

[0044] (2) Carbon dioxide is passed into an aqueous solution containing 60 grams of sodium chloride and 30 milliliters of ammonia water, and the absorption reaction generates sodium bicarbonate and ammonium chloride.

[0045] (3) Dissolve 50 grams of the produced ammonium chloride and 39 grams of lightly burned magnesia powder into a 250 ml three-neck flask, react for 40 minutes at a water bath temperature of 60°C and a stirring speed of 300 r / min, and collect ammonia gas. A clear solution was obtained after suction filtration. Let the clear solution stand at room temperature for 2 days to precipitate wh...

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Abstract

A method for dual utilization of low-grade magnesite magnesite and carbon, relates to a method for dual utilization of low-grade magnesite magnesite. The method uses tailings powder and sulfuric acid after flotation of low-grade magnesite as raw materials, chemical React to prepare magnesium sulfate heptahydrate, and at the same time, recycle and utilize carbon dioxide; react carbon dioxide recovered by chemical method with sodium chloride solution dissolved in ammonia gas at room temperature to generate sodium bicarbonate and ammonium chloride; Ammonium chloride reacts with light-burned magnesia powder to generate magnesium chloride, ammonia gas is evaporated and reused; ammonia gas is passed into magnesium sulfate aqueous solution to generate magnesium hydroxide flame retardant, and ammonium sulfate is produced as a by-product; ammonium sulfate is reacted with light-burned magnesia to form Magnesium sulfate and ammonia are evaporated and recycled; the invention opens up the dual utilization of magnesium and carbon in the magnesite processing industry, and truly realizes the comprehensive utilization and even high-efficiency utilization of resources. The application of this technology has driven the development of the magnesite industry and opened up a new chapter in the processing and utilization of magnesite. The application of the technology has broad prospects.

Description

technical field [0001] The invention relates to a method for utilizing magnesium ore, in particular to a method for utilizing magnesium and carbon of low-grade magnesite. Background technique [0002] In the use of magnesite in China, there is a problem that high-quality magnesite is over-exploited, while low-grade magnesite or fine ore and tailings are not fully utilized. The problem of mine vegetation restoration is serious, and the comprehensive utilization of resources is not high. Not only are there few product varieties, but the product grades are also not high. [0003] Utilizing the characteristics of chemical technology, aiming at the common utilization of low-grade magnesite, not only the protective use of refractory raw materials, but also the transformation of the magnesite industry and the reform of the supply side structure, the chemical utilization of carbon dioxide in magnesite, not only solves the problem It solves the problem of carbon dioxide emission, a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F5/40C01B32/50C01D7/18C01C1/16C01C1/24C01F5/20C01F5/30
CPCC01C1/164C01C1/24C01D7/18C01F5/20C01F5/30C01F5/40C01P2004/03
Inventor 王国胜刘超辉赵昕昕谢英鹏王祝敏聂鑫
Owner SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
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