Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for preparing rod-like magnesium hydroxide from salt lake brine

A salt lake brine and magnesium hydroxide technology, applied in the field of comprehensive utilization of salt lake resources, can solve the problems of polluting products and difficult cleaning of surfactants, and achieve the effects of separation and removal, easy washing, and wide source of raw materials

Inactive Publication Date: 2013-11-13
CENT SOUTH UNIV
View PDF3 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These processes use surfactants as templates, which are difficult to clean and residues will contaminate the product

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
  • Method for preparing rod-like magnesium hydroxide from salt lake brine
  • Method for preparing rod-like magnesium hydroxide from salt lake brine
  • Method for preparing rod-like magnesium hydroxide from salt lake brine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0030] The salt lake brine is evaporated in the salt field, concentrated and crystallized to produce potassium sulfate, sodium chloride, and potassium chloride. After absorbing and extracting lithium, the old brine containing magnesium and boron is obtained. The composition is shown in Table 1.

[0031] 1) Concentrated crystalline bischofite

[0032] Add 10L of brine in the reaction tank, heat and concentrate at 118°C, when the volume of the brine is reduced to 6.5L, stop heating, seal and keep warm for 2-3 hours, then filter while it is hot, cool the filtrate to room temperature, and crystallize bischofite (composition See Table 2), the weight is 2.6kg.

[0033] 2) Preparation of basic magnesium chloride by ammonia precipitation

[0034] The bischofite obtained is dissolved in water, and the concentration of magnesium ions is made into a solution of 3.5mol / L, and the volume is 3.5L. In the ammonia distillation tank with a volume of 30L, 15L of ammonium chloride mother liquor...

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 invention discloses a method for preparing rod-like magnesium hydroxide from salt lake brine. The method comprises the following steps of: concentrating and crystallizing salt lake brine, from which elements such as potassium and lithium are extracted, serving as a raw material to obtain bischofite; dissolving the bischofite separated by crystallization into water to prepare magnesium chloride solution; introducing ammonia gas to perform magnesium precipitation reaction; when the pH value reaches 7-8, stopping introducing the ammonia gas, reacting at the temperature of 30-50 DEG C for 0.5-2 hours, aging and filtering to obtain alkaline magnesium chloride and magnesium precipitation mother liquor; dispersing the alkaline magnesium chloride in mixed solution of ethanol and water to obtain alkaline magnesium chloride suspension; adding sodium hydroxide to further precipitate to obtain rod-like magnesium hydroxide; filtering and separating to obtain magnesium precipitation mother liquor; replenishing the bischofite and circulating for precipitating the alkaline magnesium chloride; feeding to an ammonia still process along with concentration enrichment of magnesium precipitation mother liquor in ammonia chloride; performing ammonia still with lime; and circulating the produced ammonia gas to precipitate the alkaline magnesium chloride of a next batch and producing byproduct calcium chloride, wherein the magnesium content in the brine is not less than 93.4 g / L. The method has the advantages of high product purity, good economic benefit, no environmental pollution, high operability and easiness for industrial production.

Description

technical field [0001] The invention relates to the field of comprehensive utilization of salt lake resources, in particular to a method for preparing rod-shaped magnesium hydroxide by using salt lake brine as a raw material. technical background: [0002] my country is a country rich in salt lake resources, which are rich in potassium, sodium, magnesium and other resources. Taking Jinel Salt Lake in Dongtai, Qinghai as an example, the proven reserves of potassium chloride have reached 18.28 million tons, 84 million tons of sodium chloride, and 70 million tons of magnesium chloride. Potassium and sodium resources are well developed and utilized, and the technology is mature. However, the development and utilization of magnesium resources in salt lakes in my country is still in its infancy. There are many raw materials and low-grade products, and few high-end and functional products, forming a low-end product export and high-end products. import situation. [0003] Magnesium...

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
Patent Type & Authority Patents(China)
IPC IPC(8): C01F5/20C01F11/24
Inventor 杨喜云于培峰徐徽石西昌陈白珍
Owner CENT SOUTH UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com