A method for preparing high-purity magnesium oxide by utilizing magnesium carbonate coarse ore

A technology of coarse magnesium carbonate ore and magnesium oxide, applied in magnesium oxide and other directions, can solve the problems of high production cost, large resin consumption, inability to remove boron compound impurities, etc., and achieves the effects of convenient operation and simple process

Active Publication Date: 2016-04-13
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The extraction method is mainly suitable for the solution system with a boron content of 2-18g / L. The main problem is that the selectivity of the existing extractant is low, which limits its application system.
(3) Ion exchange resin method, using chelating resin with selective adsorption of boron to remove boron in seawater or brine, the effect of boron removal is better; but due to the limited capacity of ion exchange resin, it is mainly suitable for boron content less than 30mg / L solution system, when the system contains high boron content, there are problems of large resin consumption and high production cost
In the above boron removal methods, the traditional method is used to dissolve the raw materials, and the boron compound existing between the magnesium carbonate crystals cannot be dissolved, resulting in the impurity of the boron compound impurity in this part cannot be removed

Method used

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  • A method for preparing high-purity magnesium oxide by utilizing magnesium carbonate coarse ore

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Experimental program
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Effect test

Embodiment 1

[0033] 1. The raw material is magnesium carbonate coarse ore, which is the primary product of Longmu Co and Jiezechaka salt lake brine (sulphate type and carbonate type salt lake brine), and the main component of the raw material is 67.2% 4MgCO 3 ·Mg(OH) 2 ·5H 2 O, the secondary components are NaCl and a small amount of sulfate and 0.27% of boron-containing compounds (calculated as B), etc. First use 80 mesh screens to sieve after magnesium carbonate coarse ore is pulverized, adopt the method for traditional washing, filtration to remove soluble impurity (for example use deionized water to be made into slurry according to the liquid-solid ratio of 5:1 by weight, Filtration in vacuum after mechanical stirring, repeated twice).

[0034] Two, adding mass concentration to the magnesium carbonate coarse ore after screening and removing soluble impurities is 3% sodium bicarbonate solution as boron removal agent, wherein, according to mass ratio calculation, the ratio of sodium bic...

Embodiment 2

[0040] 1. The raw material is magnesium carbonate coarse ore, which is the primary product of Longmu Co and Jiezechaka salt lake brine (sulphate type and carbonate type salt lake brine), and the main component of the raw material is 67.2% 4MgCO 3 ·Mg(OH) 2 ·5H 2O, the secondary components are NaCl and a small amount of sulfate and 0.27% of boron-containing compounds (calculated as B), etc. First use 60 mesh sieves to sieve after magnesium carbonate coarse ore is pulverized, adopt traditional washing, the method for filtering to remove soluble impurity (for example use deionized water to be made into slurry according to the liquid-solid ratio of 5:1 by weight, Filtration in vacuum after mechanical stirring, repeated twice).

[0041] Two, adding mass concentration to the magnesium carbonate coarse ore after screening and removing the soluble impurities is 9% sodium bicarbonate solution as boron removal agent, wherein, calculated according to mass ratio, the ratio of sodium bic...

Embodiment 3

[0047] 1. The raw material is magnesium carbonate coarse ore, which is the primary product of Longmu Co and Jiezechaka salt lake brine (sulphate type and carbonate type salt lake brine), and the main component of the raw material is 67.2% 4MgCO 3 ·Mg(OH) 2 ·5H 2 O, the secondary components are NaCl and a small amount of sulfate and 0.27% of boron-containing compounds (calculated as B), etc. First use 80 mesh screens to sieve after magnesium carbonate coarse ore is pulverized, adopt the method for traditional washing, filtration to remove soluble impurity (for example use deionized water to be made into slurry according to the liquid-solid ratio of 5:1 by weight, Filtration in vacuum after mechanical stirring, repeated twice).

[0048] Two, adding mass concentration to the magnesium carbonate coarse ore after screening and removing soluble impurities is 6% sodium bicarbonate solution as boron removal agent, wherein, according to mass ratio calculation, the ratio of sodium bic...

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Abstract

The invention discloses a method for preparing high-purity magnesium oxide by utilizing a magnesium carbonate coarse ore. The method comprises the following steps: (1) smashing the magnesium carbonate coarse ore and then sieving; (2) adding a boron removing agent into the sieved magnesium carbonate coarse ore to form a first slurry, wherein the boron removing agent is a bicarbonate solution; (3) adding the first slurry into a reaction kettle to carry out a hydrothermal reaction, so as to obtain a second slurry; (4) filtering, washing and drying the second slurry to obtain anhydrous magnesium carbonate; (5) firing the anhydrous magnesium carbonate to obtain the high-purity magnesium oxide. According to the method for preparing the high-purity magnesium oxide by utilizing the magnesium carbonate coarse ore, the bicarbonate as the boron removing agent is added; through the hydrothermal reaction, boron-insoluble compounds among magnesium carbonate crystals are converted into soluble substances; boron impurities are removed by washing, and finally the magnesium oxide with the purity of 98% above is prepared. The process is simple, the operation is convenient, and the salt lake resource can be effectively utilized.

Description

technical field [0001] The invention relates to a method for preparing high-purity magnesium oxide, in particular to a method for preparing high-purity magnesium oxide by utilizing magnesium carbonate coarse ore. Background technique [0002] High-purity magnesium oxide generally refers to products with an MgO content greater than 98%. It is widely used as a high-temperature heat-resistant material and is widely used in the fields of optics, instrumentation, electronics, electrical appliances, metallurgy, national defense and aerospace. The production of high-purity magnesium oxide generally uses ordinary magnesium oxide as raw material and is realized through special impurity removal processes, mainly including: (1) Magnesium hydroxide is obtained by various methods, and then filtered, washed, and pyrolyzed to obtain high-purity magnesium oxide. Pure Magnesium Oxide. In the method, because the magnesium hydroxide slurry is difficult to separate and wash, the impurity conte...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F5/06
CPCC01F5/06
Inventor 乃学瑛王亚斌董亚萍李武曾云
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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