Methodf or preparing anhydrous magnesium chloride

A technology of anhydrous magnesium chloride and hydrated magnesium chloride, applied in the direction of preparation/separation of magnesium chloride, magnesium halide, ammonia, etc., can solve the problems of insufficient precipitation rate, large demand for ammonia and organic solvents, etc. The effect of high utilization rate and high precipitation rate

Inactive Publication Date: 2002-01-30
青海盐湖镁业有限公司
View PDF6 Cites 17 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] The technical problem to be solved in the present invention is to provide a method for producing anhydrous magnesium chloride for electrolysis from magnesium chloride hexahydrat

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Methodf or preparing anhydrous magnesium chloride
  • Methodf or preparing anhydrous magnesium chloride

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] In a 1-liter reactor, add 250 grams of methanol, 50 grams of ethanol and 3 grams of ammonium chloride. Under normal temperature and stirring conditions, feed ammonia to make it saturated in the solvent, and slowly add 300 grams of magnesium chloride solution that has been prepared. gram, wherein containing magnesium chloride 9.3%, water 10.7%, ammonium chloride 1.2%, organic solvent 78.8%: After reacting for 1.5 hours, the slurry feed liquid was filtered, and the mixed solution of 100 gram methanol and 20 gram ethanol was saturated with ammonia Washing, the solid product is calcined at 550 DEG C for 1.2 hours through isolating the air, and anhydrous magnesium chloride can be obtained, wherein the moisture content is less than 0.1%, the magnesium oxide content is less than 0.1%, and the productive rate of magnesium chloride is 89.3%, producing 1 mole of magnesium chloride in production The ammonia requirement is 15 moles.

Embodiment 2

[0037] In the reactor of 1 liter, add 300 grams of embodiment 1 washing solution, other is the same as embodiment 1, through the anhydrous magnesium chloride of crystallization, deamination, its water content is 0.1%, and magnesium oxide content is 0.1%, the magnesium chloride The yield was 98.6%. The consumption of ammonia and organic solvent reduces 40.4% and 35.8% respectively than embodiment 1. Example 3

Embodiment 3

[0038] In a 1-liter reactor, add 300 grams of low-boiling point alcohol, including 87% methanol, 10% ethanol, 3% butanol and 3 grams of ammonium chloride. Saturation, while slowly adding 300 grams of magnesium chloride solution prepared, which contains 9.6% magnesium chloride, 14.6% water, 1.5% ammonium chloride, 74.3% low-boiling point alcohol, wherein 87% methanol, 10% ethanol and 3% butanol; After reacting for 1.5 hours, the slurry feed liquid was filtered, washed with 100 grams of ammonia-saturated low-boiling alcohol, wherein 87% of methyl alcohol, 10% of ethanol and 3% of butanol, and the solid product was calcined at 450° C. for 1.5 hours through isolated air, Anhydrous magnesium chloride can be obtained, wherein the water content is less than 0.3%, the magnesium oxide content is less than 0.2%, the yield of magnesium chloride is 90.2%, and the ammonia demand for producing 1 mole of magnesium chloride is 18 moles. Example 4

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The method for preparing anhydrous magnesium chloride includes the following steps: 1. preparation of organic hydrated magnesium chloride; 2. reaction, crystallization and coupling reaction to prepare anhydrous magnesium chloride complex; 3. solid-liquid separation and washing; 4. crystallizing mother liquor and circular utilization of precipitant; and 5. heat treatment of complex intermediate product to obtain the anhydrous magnesium chloride. Said invention adopts mixed organic solvent to prepare hydrated magnesium chloride solution, can reduce production of alkoxide in the course of crystallization, and can return the washing liquor containing saturated hexamine magnesium chloride into crystallization reaction procedure, and can raise rate of deposition of magnesium chloride and utilization rate of ammonia, and can reduce the running load of recovery tower. Said invention also adopts the reaction cold-crystallization process, and is favorable for implementing industrial production.

Description

technical field [0001] The invention relates to a method for preparing anhydrous magnesium chloride, in particular to a method for preparing anhydrous magnesium chloride by using bischofite. The anhydrous magnesium chloride prepared by the method can be directly used for producing metal magnesium by electrolyzing magnesium chloride. Background technique [0002] Metal magnesium is widely used in modern industry. The traditional industrial magnesium production technology uses magnesite, dolomite or double salt of magnesium chloride (potassium carnallite or ammonium carnallite) as raw materials for dehydration to obtain anhydrous magnesium chloride. [0003] Bischofite, a by-product in the production process of salt lake potassium chloride, is of high quality and low price, and is an ideal raw material for electrolytic magnesium. Bischofite can remove 4 parts of water through traditional heating methods to form MgCl 2 2H 2 O, and magnesium chloride dihydrate cannot continue...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C01C1/02C01F5/34
Inventor 于建国陆强宋兴福汪瑾胡鸣
Owner 青海盐湖镁业有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap