Process for preparing flame retardant grade magnesium hydroxide by ammonia method

A magnesium hydroxide, flame retardant grade technology, applied in the direction of magnesium hydroxide, etc., can solve problems such as difficulty in filter cake filtration

Inactive Publication Date: 2011-05-11
沈新财
View PDF0 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The present invention studies the influence of multiple factors on the recovery rate and filtration performance of magnesium hydroxide produced by the ammonia method through experiments, determines the ideal produ...

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
  • Process for preparing flame retardant grade magnesium hydroxide by ammonia method
  • Process for preparing flame retardant grade magnesium hydroxide by ammonia method
  • Process for preparing flame retardant grade magnesium hydroxide by ammonia method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0093] Embodiment 1 of the present invention: adding water to dissolve the by-product magnesium chloride in the titanium smelting process into Mg 2+ A solution with a concentration of 40g / L is added to the reactor together with ammonia water, the excess coefficient of ammonia is 2.5, and pure magnesium hydroxide with a reaction volume of 20% is added as a seed crystal, reacted at 40°C for 60 minutes, and the reaction slurry is filtered. And use continuous vacuum suction to filter and rinse, then dry and pulverize to obtain the fibrous magnesium hydroxide crystal product. The product has been tested to meet the flame-retardant magnesium hydroxide HG / T3607-2000 Class I standard.

Embodiment 2

[0094] Embodiment 2 of the present invention: Mg 2+ Add purified brine and ammonia water with a concentration of 40g / L into the reaction kettle, the ammonia excess coefficient is 2.5, and add pure magnesium hydroxide with a reaction volume of 20% as a seed crystal, react at 40°C for 60 minutes, filter and wash the reaction slurry , and then dried and crushed to obtain fibrous magnesium hydroxide crystal products. The product has been tested to meet the flame-retardant magnesium hydroxide HG / T3607-2000 Class I standard.

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 process for preparing flame retardant grade magnesium hydroxide by an ammonia method. The process comprises the following steps of: adding purified brine of which the Mg<2+> concentration is 40g/L and ammonia water into a reaction kettle and reacting for 60 minutes at 40 DEG C, wherein the ammonia excessive coefficient is 2.5; filtering and washing reaction slurry; and then drying and pulverizing to obtain a fibroid magnesium hydroxide crystal product. Compared with the prior art, through testing and researching, the process determines an optimal technological condition for producing the magnesium hydroxide by an ammonia method, effectively improves the conversion rate of magnesium, improves the filtering property of a filter cake through adding pure magnesium hydroxide as a seed crystal and solves the problem of difficult filtering because the filter cake changes along with the washing pH; the obtained magnesium hydroxide product conforms to the standard of the HG/T3607-2000 I grade of the flame retardant grade magnesium hydroxide, and indicated through TEM (Transverse Electric and Magnetic Field) morphology analysis, the product is fibroid crystal; and the magnesium hydroxide of the fibroid crystal has good dispersity and flowability.

Description

technical field [0001] The invention relates to a process for preparing flame-retardant grade magnesium hydroxide by an ammonia method, and belongs to the technical field of preparation of magnesium hydroxide products. Background technique [0002] Magnesium hydroxide, as a halogen-free, inorganic additive flame retardant, is currently a good variety of inorganic additive flame retardants in terms of comprehensive functions and technical and economic evaluations, so it has attracted widespread attention from all over the world. Making full use of various magnesium-containing raw materials to accelerate the development of magnesium hydroxide and meet the needs of domestic and foreign markets is one of the important development directions of the current magnesium chemical industry. [0003] At present, titanium smelting is mainly produced by magnesia thermal reduction method, and the main reactions are as follows: [0004] TiO 2 +2Cl 2 +C=TiCl 4 +CO 2 [0005] TiO 2 +2C...

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): C01F5/20C09K21/02
Inventor 沈新财
Owner 沈新财
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