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Method for preparing ammonium chloride

A technology of ammonium chloride and magnesium chloride, applied in ammonium halide, magnesium hydroxide and other directions, can solve the problem of complex and high cost of flame-retardant magnesium oxide process, and achieve the effects of easy filtration and washing, high purity, and environmental friendliness

Inactive Publication Date: 2014-10-01
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the defect of high complex and costly process for preparing flame-retardant magnesium oxide in the prior art, and provide a method for producing ammonium chloride and magnesium hydroxide for flame-retardant by using liquid ammonia method

Method used

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  • Method for preparing ammonium chloride

Examples

Experimental program
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Effect test

Embodiment 1

[0026] see figure 1 , according to a certain ratio, mix the old bittern for extracting potassium, evaporate the mother liquor and water, so that the concentration of magnesium chloride reaches 15% (w / w), and add it to a 2L stirring reactor according to the feed rate of 0.8L / h, and the liquid ammonia According to the speed of 1.4mol / h, it is passed from the bottom of the reaction kettle, the stirring intensity is 650rpm, the reaction is carried out at 40°C, and the reaction mother liquor containing magnesium hydroxide precipitate is obtained through overflow.

[0027] The above reaction mother liquor was filtered to obtain magnesium hydroxide solid and primary mother liquor, and the obtained magnesium hydroxide precipitate was washed and dried to obtain a magnesium hydroxide product with a purity of 99.8% and a median particle size D50 of 35.1 μm.

[0028] After the primary mother liquor is distilled under reduced pressure, the secondary mother liquor is obtained, and the obtai...

Embodiment 2

[0031] According to a certain ratio, mix the old bittern for extracting potassium, evaporate the mother liquor and water, make the concentration of magnesium chloride reach 20% (w / w), join in the stirred reaction kettle of 5L according to the feeding speed of 5.0L / h, liquid ammonia according to The speed of 18mol / h is passed from the bottom of the reaction kettle, the stirring intensity is 600rpm, the reaction is carried out at 60°C, and the reaction mother liquor containing magnesium hydroxide precipitate is obtained through overflow.

[0032] The above reaction mother liquor was filtered to obtain magnesium hydroxide solid and primary mother liquor, and the obtained magnesium hydroxide precipitate was washed and dried to obtain a magnesium hydroxide product with a purity of 99.6% and a median particle size D50 of 29.3 μm.

[0033] After the primary mother liquor is distilled under reduced pressure, the secondary mother liquor is obtained, and the obtained ammonia gas is absor...

Embodiment 3

[0036] According to a certain ratio, mix the old bittern for potassium extraction, evaporate the mother liquor and water, so that the concentration of magnesium chloride reaches 25% (w / w), and add it into a 10L stirring reactor according to the feed rate of 15L / h, and the liquid ammonia is 95mol The speed of / h is passed from the bottom of the reactor, the stirring intensity is 244rpm, the reaction is carried out at 90°C, and the reaction mother liquor containing magnesium hydroxide precipitate is obtained through overflow.

[0037] The above reaction mother liquor was filtered to obtain magnesium hydroxide and primary mother liquor, and the obtained magnesium hydroxide precipitate was washed and dried to obtain a magnesium hydroxide product with a purity of 99.2% and a median particle size D50 of 23.5 μm.

[0038] After the primary mother liquor is distilled under reduced pressure, the secondary mother liquor is obtained, and the obtained ammonia gas is absorbed by the potassi...

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Abstract

The invention discloses a method for preparing ammonium chloride. The method comprises the following steps: (1), adding liquid ammonia into reaction liquor containing magnesium chloride, reacting in an open system, and reacting to obtain reaction mother liquor containing magnesium hydroxide precipitates; (2), filtering the reaction mother liquor to obtain primary mother liquor; (3), evaporating ammonia under reduced pressure in the primary mother liquor to obtain an ammonia gas and secondary mother liquor; and (4), concentrating the secondary mother liquor to obtain ammonium chloride and tertiary mother liquor. According to the method disclosed by the invention, utilization rate of liquid ammonia is high, and the method disclosed by the invention can be used for preparing ammonium chloride while preparing magnesium hydroxide, is free of emission of three wastes, small in treatment amount, and belongs to a clean, environment-friendly and green chemical production method.

Description

technical field [0001] The invention belongs to the field of salt lake chemistry, and in particular relates to a method for preparing ammonium chloride from solid potassium salt ore. Background technique [0002] Ammonium chloride is colorless crystal or white crystalline powder; odorless, salty and cool taste; hygroscopic, easily soluble in water and slightly soluble in ethanol. When ammonia gas and hydrogen chloride combine to form ammonium chloride, there will be white smoke. Odorless. The taste is salty, cool and slightly bitter. Ammonium chloride is mainly used in dry batteries, storage batteries, ammonium salts, leather tanning, electroplating, precision casting, medicine, photography, electrodes, adhesives, nourishment for yeast and dough improver, etc. Ammonium chloride is referred to as "ammonium chloride" for short, also known as brine sand. It is a quick-acting nitrogen chemical fertilizer with a nitrogen content of 24% to 25%. It is a physiologically acidic fe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01C1/16C01F5/20
Inventor 李法强王敏贾国凤彭正军祝增虎诸葛芹时历杰赵有璟李锦丽
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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