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Method for preparing basic magnesium chloride from dolomite

A technology of magnesium chloride and magnesium chloride solution, applied in magnesium chloride, magnesium halide and other directions, can solve the problems of complex process flow and high cost of raw materials, and achieve the effects of simple preparation process flow, good thermal stability and less discharge

Inactive Publication Date: 2008-09-17
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the brine-ammonia method is generally used to prepare basic magnesium chloride, and the cost of raw materials is high and the process is complicated.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 1) Fully crush the dolomite and calcinate it in a furnace at 800°C for 6-8 hours to obtain dolomite to remove CO 2 The calcined product, its general chemical structure is (Mg, Ca)O;

[0023] 2) In 1 liter of magnesium chloride solution with a concentration of 3M, slowly add 200 grams of finely ground calcined product, continue stirring for 15 minutes, and react in a water bath at 60-90° C. for 2 to 4 hours to obtain the reaction product;

[0024] 3) Aging the reaction product at room temperature for 4 days in isolation from the air; after fully reacting, the reaction product solidifies into a cement-like shape, washed, dried at 90°C, and calcined in a furnace at 300°C for 2 hours to obtain basic magnesium chloride.

Embodiment 2

[0026] 1) The dolomite is fully crushed and calcined in a furnace at 1000°C for 8 hours to obtain dolomite to remove CO 2 The calcined product, its general chemical structure is (Mg, Ca)O;

[0027] 2) In 1 liter of magnesium chloride solution with a concentration of 6M, slowly add 400 grams of finely ground calcined product, continue stirring for 60 minutes, and react in a water bath at 90° C. for 4 hours to obtain a reaction product;

[0028] 3) Aging the reaction product at room temperature for 12 days in isolation from the air; after fully reacting, the reaction product is solidified into cement, washed, dried at 150°C, and calcined in a furnace at 400°C for 5 hours to obtain basic magnesium chloride.

Embodiment 3

[0030] 1) The dolomite is fully crushed and calcined in a furnace at 900°C for 7 hours to obtain dolomite to remove CO 2 The calcined product, its general chemical structure is (Mg, Ca)O;

[0031] 2) In 1 liter of magnesium chloride solution with a concentration of 5M, slowly add 300 grams of finely ground calcined product, continue stirring for 40 minutes, and react in a water bath at 75° C. for 3 hours to obtain a reaction product;

[0032] 3) Aging the reaction product at room temperature for 7 days in isolation from air; after fully and completely reacting, the reaction product solidifies into a cement-like shape, washed, dried at 120°C, and calcined in a furnace at 350°C for 3.5 hours to obtain basic magnesium chloride.

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Abstract

The invention discloses a method for preparing basic magnesium chloride from dolostone, which is characterized in that dolostone is used as the raw material to prepare basic magnesium chloride powder. Each basic magnesium chloride is provided with a plurality of crystal water molecules, when heated, a large amount of fugitive constituents are released at low temperature segment due to the loss of crystal water, while a great deal of heat is absorbed at the high temperature due to the decomposition of basic magnesium chloride. The two decomposition reactions both absorb a huge amount of heat, which covers the low temperature segment and the high temperature segment, thus broadening the temperature range of fire retardation. As the structural layer of the basic magnesium chloride comprises chlorine ions, when applied as a plastic fire retardant, the anti-flaming performance is superior to those of the prior magnesium hydroxide and aluminum hydroxide. By adopting natural mineral dolostone as raw material, the technical process proposed in the invention for preparing basic magnesium chloride fire retardant has the advantages of extensive sources, low price, simple technical process, and less investment in equipment. If the basic magnesium chloride prepared by the invention is used as a fire retardant, the performance price ration will be obviously better than the fire retardants available on the market, such as magnesium hydroxide, hydrotalcite, antimony oxide and aluminum hydroxide.

Description

technical field [0001] The invention relates to a method for preparing basic magnesium chloride from dolomite. Background technique [0002] Dolomite is an important calcium and magnesium resource on the earth, and it has extremely rich reserves in my country. However, the development and utilization of dolomite in my country is very low at present, and most mines only sell raw ore. In terms of deep processing, decomposing dolomite with hydrochloric acid to prepare light magnesium oxide and anhydrous calcium chloride is the main way to comprehensively utilize dolomite. At present, no one has tried to directly prepare basic magnesium chloride from dolomite. [0003] Basic magnesium chloride is an important chemical raw material, which can be used to prepare fibrous magnesium hydroxide; using basic magnesium chloride whiskers as a filler for hot melt adhesives can effectively improve the processing performance and 180° peel strength of hot melt adhesives, etc. The performanc...

Claims

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Application Information

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IPC IPC(8): C01F5/30
Inventor 叶瑛陈雪刚吕双双张平萍邬黛黛刘利光胡秀芳高奇东
Owner ZHEJIANG UNIV
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