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Low-grade magnesite comprehensive utilization method

A low-grade, magnesite technology, applied in the direction of magnesium halide, magnesium carbonate, magnesium chloride, etc., can solve the problems of energy consumption, environmental pollution, waste of resources, etc., and achieve the effect of comprehensive utilization of resources

Active Publication Date: 2017-12-01
丹东金硼肥业有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] So far, the chemical utilization of magnesite is only to use light-calcined magnesite after calcining as raw material, and then react with sulfuric acid or hydrochloric acid to form magnesium sulfate heptahydrate or magnesium chloride hexahydrate, and carbon dioxide is directly emitted during the calcination process , not utilized, not only consumes energy, wastes resources, but also pollutes the environment
What's more, calcination is to obtain raw materials for making refractory materials, and most of the low-grade magnesite, tailings, fine ore, etc. are not used

Method used

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  • Low-grade magnesite comprehensive utilization method
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  • Low-grade magnesite comprehensive utilization method

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Experimental program
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Effect test

Embodiment approach

[0040] (1) Weigh 100 grams of low-grade magnesite powder, pour 0.01 grams of surfactant into 100 milliliters of deionized water with a pH value of 11, stir, and modify the surface for 5 minutes.

[0041] (2) The modified magnesite powder is obtained by filtration, and the mother liquor is recycled.

[0042] (3) Pour 100 grams of modified magnesite powder into a 500 ml three-necked flask, measure 100 ml of concentrated sulfuric acid with a measuring cylinder, dilute to 50% (mass ratio), 30 drops / min, and drop into the three-necked flask , start stirring at 300 rpm, heat up to 35°C-85°C, and react for 1 to 3 hours.

[0043] (4) Pass carbon dioxide into an aqueous solution containing 60 grams of sodium chloride and 30 milliliters of ammonia water, absorb and react to form sodium bicarbonate and ammonium chloride, cool down to 10°C, add sodium chloride, and filter to obtain sodium bicarbonate.

[0044] (5) Carbon dioxide was passed into an aqueous solution containing 60 grams of ...

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Abstract

The invention discloses a low-grade magnesite comprehensive utilization method, and relates to a magnesite utilization method. The method comprises the following steps: using low-grade magnesite as a raw material, wherein the magnesium oxide content is less than or equal to 40%, crushing, grinding and sieving, modifying by a surfactant, and directly chemically reacting with a sulfuric acid or a hydrochloric acid to prepare magnesium sulfate heptahydrate or magnesium chloride hexahydrate, and recycling and using carbon dioxide; enabling the modified magnesite powder to chemically react with the sulfuric acid (or the hydrochloric acid), generating the magnesium sulfate heptahydrate or the magnesium chloride hexahydrate, recycling and releasing the carbon dioxide; circularly using generated magnesium chloride and steamed ammonia gas; and enabling filtered residue, silico-calcium and light roasting powder to react with the magnesium sulfate heptahydrate, and preparing a magnesium oxysulfate binding material. The whole process is zero release, the magnesite is completely used, and the comprehensive utilization of the magnesite is realized.

Description

technical field [0001] The invention relates to a method for utilizing magnesite, in particular to a method for comprehensive utilization of low-grade magnesite. Background technique [0002] In the use of magnesite in China, in order to produce refractory materials, there is a problem that high-quality magnesite is over-mined and used, but 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] So far, the chemical utilization of magnesite is only to use light-calcined magnesite as raw material after magnesite calcining, and then react with sulfuric acid or hydrochloric acid to form magnesium sulfate heptahydrate or magnesium chloride hexahydrate, and carbon dioxide is directly emitted during the calcination process If it is not used, it will not only con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B9/04C04B9/20C01D7/18C01F5/24C01F5/30
CPCC01D7/18C01F5/24C01F5/30C04B9/04C04B9/20
Inventor 王国胜齐广张春赵昕昕谢英鹏聂鑫
Owner 丹东金硼肥业有限公司
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