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Method for preparing high-purity high-activity magnesium hydroxide through calcium-containing magnesium hydroxide

A technology of magnesium hydroxide and high activity, applied in the direction of magnesium hydroxide, etc., can solve the problems of low purity and low efficiency, and achieve the effect of high purity, high efficiency and improved activity

Active Publication Date: 2015-09-09
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

All can moderately improve the purity of calcium-containing magnesium hydroxide, but there are still problems of low efficiency and low purity (generally less than 97wt%)

Method used

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  • Method for preparing high-purity high-activity magnesium hydroxide through calcium-containing magnesium hydroxide
  • Method for preparing high-purity high-activity magnesium hydroxide through calcium-containing magnesium hydroxide

Examples

Experimental program
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Effect test

Embodiment 1

[0031] Take by weighing 100 grams of calcium-containing agglomerated magnesium hydroxide raw material (calcium content 10wt%, average primary particle diameter 0.1 micron, average agglomerated particle diameter 5 microns, specific surface area 40m 2 / g, magnesium hydroxide main content 85wt%,), add the aqueous solution that contains 0.01wt% tartaric acid, 20wt% sodium chloride, make solid containing 1wt% suspension, stir (800 rev / min) at 10 ℃ then and react 0.5 Hour, filter, wash, dry (110 ℃, 1 hour), obtain the dispersed high-purity magnesium hydroxide of main content 98.5wt%; Dispersed high-purity magnesium hydroxide is placed in vacuum furnace (vacuum degree 10 -3 Pa), raise the temperature to 300°C at 0.05°C / min in the air atmosphere, and roast at constant temperature for 1 hour to obtain a specific surface area of ​​800m 2 / g of porous active magnesia; above-mentioned magnesia is added to the aqueous solution containing 0.001wt% sodium stearate to make a suspension with a...

Embodiment 2

[0033] Take by weighing 100 grams of calcium-containing agglomerated magnesium hydroxide raw material (calcium content 0.01wt%, average primary particle diameter 4 microns, average aggregated particle diameter 50 microns, specific surface area 5m 2 / g, magnesium hydroxide main content 97wt%), add the aqueous solution that contains 20wt% ethylenediaminetetraacetic acid, 0.01wt% potassium chloride, 5wt% sodium hexametaphosphate, make solid containing 30wt% suspension, then in 100 ℃ stirring (50 revs / min) reaction 36 hours, filter, wash, dry (80 ℃, 6 hours), obtain the dispersed high-purity magnesium hydroxide of main content 98.8wt%; Dispersed high-purity magnesium hydroxide is placed in vacuum furnace (vacuum degree 10 4 Pa), heated up to 700°C at 30°C / min in a nitrogen atmosphere, and roasted at a constant temperature for 24 hours to obtain a specific surface area of ​​100m 2 / g of porous active magnesium oxide; adding the above magnesium oxide to an aqueous solution containi...

Embodiment 3

[0035] Take by weighing 100 grams of calcium-containing agglomerated magnesium hydroxide raw material (calcium content 5wt%, average primary particle diameter 2 microns, average agglomerated particle diameter 15 microns, specific surface area 35m 2 / g, magnesium hydroxide main content 92wt%), add the aqueous solution containing 10wt% sodium nitrilotriacetate, 2wt% tartaric acid, 0.5wt% magnesium chloride, make solid containing 20wt% suspension, then stir at 90 ℃ (450 rpm / min) reacted for 3 hours, filtered, washed, and dried (90°C, 2 hours), to obtain the dispersed high-purity magnesium hydroxide with a main content of 98.6wt%; the dispersed high-purity magnesium hydroxide was placed in a vacuum furnace (vacuum degree 10 -2 Pa), heated up to 500°C at 20°C / min in a nitrogen atmosphere, and roasted at a constant temperature for 14 hours to obtain a specific surface area of ​​300m 2 Porous activated magnesia per g; above-mentioned magnesia is added to the aqueous solution contain...

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Abstract

The invention provides a method for preparing high-purity high-activity magnesium hydroxide through calcium-containing magnesium hydroxide and belongs to the technical field of preparation of inorganic chemical materials. The method comprises the following steps: by using calcium-containing magnesium hydroxide as a raw material, firstly, carrying out decalcification and dispersion on the raw material through a liquid phase conversion method by using a calcium remover and a dispersing agent so as to obtain dispersed high-purity magnesium hydroxide; carrying out activated roasting on magnesium hydroxide at a low-medium temperature vacuum condition, so as to obtain high-specific-surface-area porous magnesium oxide; adding magnesium oxide in an aqueous solution containing a surfactant for activation conversion so as to obtain a high-purity high-activity magnesium hydroxide product. According to the method, the process is simple, the process is mild and easy to control, the product purity is high, the specific surface area is large, the activity is good and the high-purity high-activity magnesium hydroxide can be used as a basic inorganic chemical product or an effective adsorbent to be applied to the fields of medicine, inflaming retarding, metallurgy, catalyzing, desulfurization, adsorption and the like.

Description

technical field [0001] The invention relates to a preparation method of high-purity and high-activity magnesium hydroxide, which belongs to the technical field of preparation of inorganic chemical materials. Background technique [0002] Magnesium hydroxide is a basic inorganic chemical product with superior performance and a wide range of uses. Among them, high-purity and high-activity magnesium hydroxide is attracting people as a high value-added product because of its characteristics of less impurities, high reactivity, and strong adsorption capacity. extensive attention. [0003] The preparation methods of magnesium hydroxide mainly include gas phase method and liquid phase method. The gas phase method generally uses magnesium chloride or magnesium carbonate as a raw material, first prepares magnesium oxide by roasting, and then hydrolyzes it into magnesium hydroxide. Such as the Aman process of the Dead Sea Group of Israel (Harben P. Minster T. Industrial mineral deve...

Claims

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Application Information

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IPC IPC(8): C01F5/14
Inventor 向兰张军平姬昱余波易美桂
Owner TSINGHUA UNIV
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