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Ammonium chloride circulation method for producing magnesium hydroxide and calcium chloride from carbide slag and salt lake magnesium chloride

A technology of magnesium hydroxide and ammonium chloride, applied in the direction of magnesium hydroxide, calcium/strontium/barium halide, etc., can solve the problem of low utilization rate of ammonia

Inactive Publication Date: 2013-04-03
但建明
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AI Technical Summary

Problems solved by technology

However, the ammonia utilization rate of the brine-ammonia water method is low

Method used

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Embodiment Construction

[0015] 4.1 Ammonium chloride circulation method to produce magnesium hydroxide

[0016] The calcium carbide slag is dried at 100-105°C for 2-3 hours, and then pulverized by a ball mill or a pulverizer until the fineness passes through a sieve of more than 100 mesh for later use. Take a certain amount of salt lake water MgCl 2 , adding an appropriate amount of distilled water and heating until boiling and dissolving, suctioning and filtering under reduced pressure while it is hot, concentrating the filtrate and cooling down to crystallize, washing the crystal with a small amount of cold distilled water 2-3 times to obtain purified magnesium chloride. The recrystallized MgCl 2 Prepared to a concentration of 2.0-2.5mol L -1 MgCl 2 The solution is ready for use. Take the processed excess carbide slag and NH 4 Cl (molar ratio between 1.05:2-1.2:2) reacts at 85-95°C to produce NH 3 , according to NH 4 Cl and MgCl 2 The molar ratio is 5.0 to prepare NH 3 . Will NH 3 Direct...

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Abstract

The invention belongs to the field of waste reuse. Carbide slag is a waste generated in an acetylene production process using a calcium carbide method; and the main component is Ca(OH)2 the content of which exceeds 85%. The byproduct magnesium salt of the salt lake sylvite industry is mainly used for producing cheap magnesium chloride hexahydrate and magnesium sulfate heptahydrate, or is exported directly in a mineral form, causing waste of resources. According to the invention, high-purity magnesium hydroxide as well as anhydrous calcium chloride is produced by use of carbide slag and salt lake magnesium chloride by an ammonium chloride circulation method; and the method not only can obtain high-purity magnesium hydroxide and industrial-grade calcium chloride, but also can effectively solve the problem of environmental pollution caused by ammonia gas in magnesium hydroxide produced by an ammonia method. The study promotes energy conservation, emission reduction and low-carbon economy, and realizes great environmental benefits, social benefits and economic benefits.

Description

[0001] Invention name [0002] Production of Magnesium Hydroxide and Calcium Chloride from Carbide Slag and Salt Lake Magnesium Chloride by Ammonium Chloride Circulation 1 technical field [0003] The field of industrial waste recycling. [0004] In order to make full use of calcium carbide slag and salt lake magnesium chloride, the present invention designs a process for comprehensive development and utilization from two aspects: first, the production of magnesium hydroxide by the ammonium chloride circulation method; second, the recovery of the by-product calcium chloride. 2 background technology [0005] 1. Product introduction [0006] Carbide slag is the waste produced in the process of producing acetylene from calcium carbide. For every t of calcium carbide consumed, about 1.5 tz of calcium carbide slag will be produced. The main component of carbide slag is Ca(OH) 2 , its content is as high as more than 85%, because the calcium carbide slag contains more impuritie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F5/20C01F11/20
Inventor 但建明李阳李洪玲乔秀文齐誉姜丽娜曾宪佳
Owner 但建明
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