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One-step process of producing magnesium hydroxide

A technology of magnesium hydroxide and footwork, applied in the direction of magnesium hydroxide, etc., can solve the problems of scarring of equipment and pipelines, long production cycle, high production cost, etc., and achieve the effect of good product quality, stable product quality and constant operating conditions

Inactive Publication Date: 2002-01-23
SHANDONG HAIHUA GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high temperature and high pressure thermal reaction process involved in this method, the production cost is high, the production cycle is long, and the equipment and pipelines are seriously scarred.

Method used

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  • One-step process of producing magnesium hydroxide
  • One-step process of producing magnesium hydroxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] As shown in the accompanying drawing, first prepare qualified hot ammonia water and refined brine, measure the content of magnesium chloride and free ammonia in it, mix them into the reaction kettle according to the molar ratio of magnesium chloride and free ammonia as 1:1.6, After stirring and reacting at a temperature of 50 degrees for 20 minutes, pump the reaction liquid to a primary filter for solid-liquid separation and washing. The filtrate after primary filtration is distilled with lime to prepare ammonia water, which can be used as a raw material for the production of magnesium hydroxide ;The filter cake after the primary filtration is added with water and then subjected to secondary filtration, the solid material is sent to the beating kettle, and fresh water is added for beating, and then pumped to the secondary filter for filtration and washing. Both the primary filter and the secondary filter can be used Use a common filter press. The solid material after th...

Embodiment 2

[0021] Embodiment 2: production step is the same as embodiment 1, and the mol ratio of magnesium chloride and free ammonia is 1: 1.6, stirs and reacts 30 minutes under the temperature of 80 degrees centigrade, then obtains solid magnesium hydroxide by filtering-beating-filtering-drying process .

Embodiment 3

[0022] Embodiment 3: production step is the same as embodiment 1, and the mol ratio of magnesium chloride and free ammonia is 1: 2, stirs and reacts 10 minutes under the temperature of 70 degrees centigrade, then obtains solid magnesium hydroxide by filtering-beating-filtering-drying process .

[0023] In the technical scheme of the present invention, the proportioning of ammoniacal liquor and brine should be that the consumption of ammoniacal liquor is more the better, and the consumption of ammoniacal liquor is more thoroughly that magnesium hydroxide is separated out, and reaction speed is faster, but considering the production cost aspect Factors, the amount of ammonia should not be less than 1.3 times the theoretical amount. When the amount is lower than 1.3 times, there may be more magnesium ions remaining in the brine that cannot be separated out, the reaction time will be prolonged, and the production cost is higher; when the amount of ammonia water is higher than 2 ti...

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Abstract

Bittern containing magnesium chloride and ammonia water in the magnesium chloride-to-free ammonia mol. ratio of 1 to 1.3-2.0 are mixed and reacted at 45-90 deg.c for 5-30 min, and the reacted liquid is filtered, washed, dried and crushed to obtain solid magnesium hydroxide. The one-step process is a continuous one with constant operation condition, no scaling in pipeline and high product quality.The process can utilize the afterheat of ammonia water preparation to save power and fresh water. The product may be used as high quality fire retardant.

Description

technical field [0001] The present invention relates to the production method of the compound of metal magnesium, especially the production method of magnesium hydroxide. Background technique [0002] Brine refers to an aqueous solution with a salt content greater than 3.5% in nature. The comprehensive utilization of brine can produce chemical products such as table salt, Glauber's salt, potassium chloride, magnesium sulfate, anhydrous Glauber's salt, barium chloride, borax, boric acid, soda ash, bromine, and iodine. . According to its chemical composition, brine can be divided into three main types: carbonate type, sulfate type and chloride type, no matter which type of brine is rich in magnesium ions. [0003] Flame retardants can be divided into organic flame retardants and inorganic flame retardants. Organic flame retardants will produce a lot of harmful smoke and harmful gases when burned. With the development of science and technology, people...

Claims

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Application Information

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IPC IPC(8): C01F5/20
Inventor 王福文张军刘建华董益军
Owner SHANDONG HAIHUA GRP CO LTD
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