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Method for preparing high-purity magnesium oxide from coarse magnesium carbonate ore

A technology of magnesium carbonate coarse ore and magnesium oxide, applied in the directions of magnesium oxide, reagents, educts, etc., can solve the problems of large resin consumption, high production cost, limited capacity of ion exchange resin, etc., and achieves simple process and convenient operation. Effect

Active Publication Date: 2015-03-25
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI +1
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  • 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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  • Method for preparing high-purity magnesium oxide from coarse magnesium carbonate ore

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] 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 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).

[0035] Two, adding mass concentration to the magnesium carbonate coarse ore after screening and removing soluble impurities is 3% sodium carbonate solution as boron removal agent, wherein, calculate according to mass ratio, the liquid-solid ratio of so...

Embodiment 2

[0041] 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 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).

[0042] Two, adding mass concentration to the magnesium carbonate coarse ore after screening and removing soluble impurities is 9% sodium carbonate solution as boron removal agent, wherein, according to mass ratio calculation, the liquid-solid ratio of s...

Embodiment 3

[0048] 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).

[0049] 2. Add a mixed solution of sodium carbonate and sodium bicarbonate with a mass concentration of 6% to the magnesium carbonate coarse ore that has been screened and remove soluble impurities as a boron removal agent, wherein, calculated accordin...

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Abstract

The invention discloses a method for preparing high-purity magnesium oxide from coarse magnesium carbonate ore. The method comprises steps as follows: (1) crushing and then screening the coarse magnesium carbonate ore; (2) adding a boron removing agent to the screened coarse magnesium carbonate ore to obtain first slurry, wherein the boron removing agent is a bicarbonate and / or carbonate solution; (3) placing the first slurry into a reaction kettle, feeding CO2 at the normal temperature, and then conducting a hydrothermal reaction to obtain second slurry; (4) filtering, washing and drying the second slurry to obtain anhydrous magnesium carbonate; (5) burning the anhydrous magnesium carbonate to obtain the high-purity magnesium oxide. According to the method, bicarbonate is formed through feeding the CO2 into the mixed slurry, the hydrothermal reaction is conducted in the presence of the bicarbonate to convert boron compounds among magnesium carbonate crystals into soluble substances, then boron impurities are removed through washing, and the purity of the finally prepared magnesium oxide is higher than 98%.

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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IPC IPC(8): C01F5/06
CPCC01F5/06Y02P20/141
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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