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A method for preparing high-purity magnesium oxide from old brine

A magnesium oxide, high-purity technology, applied in the direction of magnesium oxide, chloride preparation, chlorine/hydrogen chloride, etc., can solve the problems that affect the purity of magnesium oxide products, there is no impurity removal step in the mother liquor, and there is no magnesium chloride solution, etc., so as to achieve easy operation and control , The process is simple and mature, and the effect of high purity

Active Publication Date: 2017-03-01
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The existing magnesium chloride pyrolysis technology to produce magnesium chloride has the following problems: (1) the magnesium chloride solution spray pyrolysis process is used, but the magnesium chloride solution is not deeply removed, which affects the purity of the magnesium oxide product; (2) individual technologies use However, before the crystallization, the mother liquor does not have a special impurity removal step, and the impurity components in the crystallization mother liquor will still enter the magnesium chloride crystal, which will eventually affect the purity of magnesium oxide.

Method used

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  • A method for preparing high-purity magnesium oxide from old brine
  • A method for preparing high-purity magnesium oxide from old brine

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Experimental program
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Effect test

Embodiment 1

[0047] The main composition of the raw material old brine is shown in Table 1.

[0048] Table 1

[0049]

[0050] First, take 2000ml of the above-mentioned old brine, vacuum filter out solid insoluble substances such as silt, and concentrate to saturation to obtain a dark yellow-brown saturated liquid. Next, at 40° C., add 2 kg of gac to the above saturated solution, stir from time to time, filter after 3 hours, the dark yellow-brown saturated solution becomes a colorless clear solution, and the solution volume is 1360 ml. Add 17.7g of anhydrous calcium chloride to the colorless and clear solution, stir and react at 80°C for 20 minutes, filter to obtain high-purity gypsum, and use the filtrate for later use. Add 6.8g of dry barium chloride powder to the filtrate, stir and react for 20min at 80°C, and filter to obtain complete removal of SO 4 2- The colorless and clear filtrate. Take 1000ml of colorless and clear filtrate, heat to evaporate 120ml of water, then naturally...

Embodiment 2

[0054] Take 2000ml of the above-mentioned old brine, vacuum filter out solid insoluble substances such as silt, and concentrate to saturation to obtain a dark yellow-brown saturated liquid. Next, at 20°C, add 2 kg of activated carbon to the above saturated solution, stir it from time to time, filter after 3 hours, the dark yellow-brown saturated solution becomes a colorless clear solution, and the volume of the solution is about 1350 ml. Add 17.7g of anhydrous calcium chloride to the colorless and clear solution, stir and react at 80°C for 20 minutes, filter to obtain high-purity gypsum, and use the filtrate for later use. Add 6.8g of dry barium chloride powder to the filtrate, stir and react for 20min at 80°C, and filter to obtain complete removal of SO 4 2- The colorless and clear filtrate. Take 1000ml of colorless and clear filtrate, heat to evaporate 150ml of water, then naturally cool to room temperature, the solution spontaneously crystallizes, and then filters to obta...

Embodiment 3

[0059] Take 2000ml of the above-mentioned old brine, vacuum filter out solid insoluble substances such as silt, and concentrate to saturation to obtain a dark yellow-brown saturated liquid. Next, at 50° C., add 2 kg of crushed coke to the above saturated solution, stir occasionally, and filter after 3 hours. The dark yellow-brown saturated solution becomes a colorless and clear solution, and the volume of the solution is about 1360 ml. Add 17.7g of anhydrous calcium chloride to the colorless and clear solution, stir and react at 60°C for 20 minutes, filter to obtain high-purity gypsum, and use the filtrate for later use. Add 6.8g of dry barium chloride powder to the filtrate, stir and react for 20min at 60°C, and filter to obtain complete removal of SO 4 2- The colorless and clear filtrate. Take 1000ml of colorless and clear filtrate, heat to evaporate 120ml of water, then naturally cool to room temperature, the solution spontaneously crystallizes, and then filters to obtain...

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Abstract

The invention relates to a method for preparing high purity magnesium oxide from old brine as a raw material and producing hydrochloric acid as a by-product. The method comprises the following steps of eliminating a color and SO4<2-> of old brine, carrying out evaporation crystallization on the solution to obtain magnesium chloride crystals, washing the crystals by a high purity magnesium chloride saturated liquid, carrying out fluid pyrolysis on magnesium chloride to obtain magnesium oxide, simultaneously carrying out tail gas absorption to obtain hydrochloric acid as a by-product, carrying out water washing and carrying out magnesium oxide roasting to obtain high purity magnesium oxide. Through multiple purification processes such as impurity removal, crystallization, washing, pyrolysis and water washing, the high purity magnesium oxide with magnesium oxide purity of 99% or more is obtained.

Description

technical field [0001] The invention belongs to the field of inorganic chemical industry, and relates to a method for preparing high-purity magnesium oxide and simultaneously producing hydrochloric acid by using old brine as a raw material. Background technique [0002] Magnesium oxide with a purity greater than 99% is called high-purity magnesium oxide. The higher the purity of magnesium oxide and the smaller the content of impurity components, the stronger its high temperature bending resistance and high temperature corrosion resistance. The raw materials for producing high-purity magnesium oxide mainly include magnesite, dolomite, sea / lake old brine, etc. my country's Liaoning Dashiqiao, Haicheng and other places are rich in magnesite, and magnesite can be calcined under different temperature conditions to obtain light-burned magnesia, heavy-burned magnesia or fused magnesite. Generally, dolomite can be calcined, digested, carbonized, filtered, pyrolyzed and calcined to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F5/06C01B7/03
Inventor 卢旭晨闫岩
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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