A kind of production method of extracting magnesium hydroxide and calcium carbonate from dolomite

A technology of magnesium hydroxide and production method, applied in magnesium hydroxide, chemical instruments and methods, calcium carbonate/strontium/barium and other directions, can solve the problems of cumbersome process, low extraction rate of magnesium, environmental pollution and the like, and achieves the technological process. Short, reduced production costs, optimized mixing effect

Active Publication Date: 2019-06-04
沈阳凯镁客科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Usually dolomite is calcined first, then digested, carbonized, etc., and the calcium component is separated and removed to obtain basic magnesium carbonate, which is then calcined and alkalized to obtain magnesium hydroxide. This method is cumbersome and has a low extraction rate of magnesium. It consumes a lot, and is easy to cause environmental pollution, and it is mostly used to prepare magnesium oxide

Method used

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  • A kind of production method of extracting magnesium hydroxide and calcium carbonate from dolomite
  • A kind of production method of extracting magnesium hydroxide and calcium carbonate from dolomite
  • A kind of production method of extracting magnesium hydroxide and calcium carbonate from dolomite

Examples

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specific Embodiment 1

[0040] A production method for extracting magnesium hydroxide and calcium carbonate from dolomite, comprising the following steps:

[0041] (1) Preparation of lightly burned dolomite powder

[0042] (11) Dolomite is added in the ball mill and pulverized and crosses a 50-mesh sieve to obtain dolomite powder;

[0043] (12) Put the dolomite powder in the muffle furnace, and calcined at 750° C. for 6 hours to obtain the lightly burned dolomite powder, and recover the generated carbon dioxide gas in the carbon dioxide storage tank through the gas-liquid mixer;

[0044] (2) Ammonia distillation reaction

[0045] Mix the light-burned dolomite powder obtained in step (1) and ammonium salt aqueous solution into the reactor, carry out ammonia distillation reaction at 80°C and 1000r / min stirring speed, react for 0.5 hours to obtain ammonia distillation liquid by suction filtration, and pass The gas-liquid mixer recovers the evaporated ammonia gas in the ammonia gas storage tank, where:...

specific Embodiment 2

[0067] Roughly the same as the specific example 1, the difference is only that the filtrate obtained in the step (32) and the step (42) can participate in the ammonia distillation reaction as the ammonium salt solution in the step (2).

specific Embodiment 3

[0068] A production method for extracting magnesium hydroxide and calcium carbonate from dolomite, comprising the following steps:

[0069] (1) Preparation of lightly burned dolomite powder

[0070] (11) Dolomite is added in the ball mill and pulverized and crosses 800 mesh sieves to obtain dolomite powder;

[0071] (12) Put the dolomite powder in a muffle furnace, and calcinate at 1000° C. for 1 hour to obtain lightly burned dolomite powder, and recover the generated carbon dioxide gas in a carbon dioxide storage tank through a gas-liquid mixer;

[0072] (2) Ammonia distillation reaction

[0073] Mix the light-burned dolomite powder obtained in step (1) and the ammonium salt aqueous solution into the reactor, carry out the ammonia distillation reaction at 105°C and 200r / min stirring speed, and obtain the ammonia distillation liquid by suction filtration after reacting for 4 hours, and pass The gas-liquid mixer recovers the evaporated ammonia gas in the ammonia gas storage t...

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Abstract

The invention relates to a production method for extracting magnesium hydrate and calcium carbonate from dolomite, and belongs to the technical field of chemical industry novel materials. The production method for extracting magnesium hydrate and calcium carbonate from dolomite comprises the following steps of (1) preparing caustic calcined dolomite powder; (2) guiding a mixture of the caustic calcined dolomite powder obtained in the step (1) and ammonium salt water solution into a reaction vessel to perform ammonia distilling reaction at 80 to 105 DEG C at the stirring speed of 200 to 1000r / min; after performing the reaction for 0.5 to 4 hours, performing suction filtration to obtain ammonia distilling liquid; recovering distilled ammonia gas into an ammonia gas storage tank through a gas-liquid mixer; (3) preparing magnesium hydroxide; (4) preparing calcium carbonate.

Description

technical field [0001] The invention relates to a production method for extracting magnesium hydroxide and calcium carbonate from dolomite, belonging to the technical field of new chemical materials. Background technique [0002] Magnesium hydroxide is an inorganic additive flame retardant, its thermal decomposition temperature is as high as 350°C, which is 140°C higher than the currently commonly used inorganic flame retardant aluminum hydroxide, which can make the synthetic material added with magnesium hydroxide withstand higher The processing temperature is beneficial to accelerate the extrusion speed, shorten the molding time, and help to improve the flame retardant efficiency. Because of its low smoke, non-toxic, good thermal stability, low price and other advantages, it is increasingly widely used at home and abroad. [0003] At present, the preparation of high-quality magnesium hydroxide mainly uses magnesite and brine with low impurity content and high magnesium co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F5/16C01F5/20C01F11/18
CPCC01F5/16C01F5/20C01F11/181C01P2002/72C01P2002/80C01P2004/03C01P2004/61C01P2004/62C01P2006/12C01P2006/80
Inventor 李雪刘云义
Owner 沈阳凯镁客科技有限公司
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