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Process for preparing high dispersion flake magnesium hydroxide

A technology of magnesium hydroxide and high dispersion, applied in directions such as magnesium hydroxide, can solve problems such as restricting industrial applications, and achieve the effects of convenient operation, low cost, and large-scale production.

Inactive Publication Date: 2003-03-12
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But so far there are not many detailed reports in this regard, which limits the industrial application of this technology

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  • Process for preparing high dispersion flake magnesium hydroxide
  • Process for preparing high dispersion flake magnesium hydroxide
  • Process for preparing high dispersion flake magnesium hydroxide

Examples

Experimental program
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Effect test

Embodiment 1

[0031] Prepare 100ml of 40% (w / v) magnesium chloride solution, 100ml of 40% (w / v) potassium hydroxide solution, 5ml of 0.1% (w / v) polyaluminum chloride solution, 0.1% (w / v) of chlorinated Sodium solution 100ml. The magnesium chloride solution was added to the sodium hydroxide solution at 25° C. under stirring (300 rpm), and the rate of adding the magnesium chloride solution was 20 ml / min. After the addition was complete, the reaction was stopped after continuing to insulate and stir for 1 hour. Add the polyaluminum chloride solution to the above suspension, stir for 10 minutes and then let it settle for 2 hours. Cool the resulting suspension, filter it, wash it with deionized water for 3 times, put it into a sodium chloride solution, stir (300rpm) and disperse for 30 minutes, then place it in a high-pressure hydrothermal reactor, and perform hydrothermal modification treatment at 100°C for 1 hour . Then cool, filter, wash 3 times with deionized water, and dry at 105°C for 4...

Embodiment 2

[0033] Prepare 5% (w / v) magnesium sulfate magnesium chloride solution 100ml, 5% (w / v) ammonium hydroxide solution 100ml, 5% (w / v) polyacrylamide solution 5ml, 25% (w / v) chlorine Calcium solution 100ml. Add the magnesium chloride solution to the sodium hydroxide solution at 80° C. under stirring (300 rpm), and the rate of adding the magnesium chloride solution is 1.0 ml / mn. After the addition was complete, the reaction was stopped after continuing to insulate and stir for 1 hour. Add the polyacrylamide solution to the above suspension, stir for 10 minutes and then let it settle for 2 hours. The obtained suspension was filtered, washed with deionized water for 3 times, put into calcium chloride solution, stirred (300rpm) and dispersed for 30 minutes, then placed in a high-pressure hydrothermal reactor, and subjected to hydrothermal modification treatment at 250°C for 8 hours. Then cool, filter, wash 3 times with deionized water, and dry at 105°C for 4 hours under air atmospher...

Embodiment 3

[0035] Prepare 10% (w / v) magnesium chloride solution 100ml, 10% (w / v) potassium hydroxide solution 100ml, 0.5% (w / v) polyferric chloride solution 5ml, 10% (w / v) magnesium chloride solution 100ml. Add the magnesium chloride solution to the sodium hydroxide solution at 90° C. under stirring (300 rpm), and the rate of adding the magnesium chloride solution is 3.0 ml / min. After the addition was complete, the reaction was stopped after continuing to insulate and stir for 1 hour. Add the polyferric chloride solution to the above suspension, stir for 10 minutes and then let it settle for 2 hours. The resulting suspension was filtered, washed with deionized water for 3 times, then placed in a magnesium chloride solution, stirred (300 rpm) for 30 minutes, placed in a high-pressure hydrothermal reactor, and hydrothermally modified at 180°C for 4 hours. Then cool, filter, wash 3 times with deionized water, and dry at 105°C for 4 hours in an air atmosphere to obtain a primary average pa...

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Abstract

A process for preparing high-dispersity flaky magnesium hydroxide from inorganic magnesium salt includes liquid-phase preciptiation of inorganic magnesium salt and inorganic alkali or sulfur hydride at 25-90 deg.C, adding water-soluble flocculant to obtain irregularly coagulated magnesium hydroxide, and hydrothermal modifying in the modifier solution at 100-250 deg.C. The product has features of high purity (97%), high dispersity, and low cost.

Description

technical field [0001] The invention relates to a preparation process of magnesium hydroxide, in particular to a preparation method of magnesium hydroxide with high purity and high dispersibility, and belongs to the technical field of inorganic chemical industry. Background technique [0002] my country is a country with large sea and lake salt resources, mainly distributed in Qinghai, Inner Mongolia, Xinjiang, Tibet, Shanxi and other provinces and coastal areas (such as Tianjin, Dalian, Shandong, etc.). Magnesium in sea and lake salt is the resource second only to sodium in reserves. Taking Qaidam Salt Lake as an example, the reserves of magnesium salts are as high as 4.81 billion tons (3.14 billion tons of magnesium chloride and 1.67 billion tons of magnesium sulfate). For a long time, limited by technical level and economic conditions, the utilization of sea and lake salt resources has been mainly focused on salt production or potassium extraction, while insufficient att...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F5/14C01F5/20
Inventor 向兰金永成魏飞金涌
Owner TSINGHUA UNIV
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