Method for producing high-pure ultra-thin micro-powder magnesium hydroxide by extracting sea water

A technology of magnesium hydroxide and a production method, applied in directions such as magnesium hydroxide, can solve the problems of uncontrollable agglomeration of magnesium hydroxide particles, agglomeration of magnesium hydroxide particles, low yield and the like, achieves simple and easy operation for washing, and reduces land occupation. Area, the effect of simplifying the process flow

Active Publication Date: 2008-02-20
天津海泽惠科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention has the advantages of simple process, high degree of automation, easy operation, low cost and high profit, and overcomes the problems of low yield caused by uncontrollable magnesium hydroxide particles agglomeration and fine particles cannot be intercepted

Method used

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  • Method for producing high-pure ultra-thin micro-powder magnesium hydroxide by extracting sea water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Example 1 Take 160L of seawater after treatment with a 0.1 μm hollow fiber ultrafiltration membrane, and analyze the concentration of calcium and magnesium ions according to 1.4:1Na 2 CO 3 / Ca 2+ 1mol / L sodium carbonate solution was added, reacted for 2h at a stirring speed of 60r / min, stood still for 24h, pH=11, and poured the supernatant into a magnesium raw material tank. Add polyethylene glycol 1000, a dispersing agent with a theoretical magnesium hydroxide production rate of 2% in the magnesium raw material tank, and stir and mix evenly. The 2mol / L sodium hydroxide solution is mixed, fully reacted by the static mixer, and directly enters the 50nm ceramic ultrafiltration membrane unit. When concentrated to a solid content of 15% by a ceramic ultrafiltration membrane, use a centrifugal pump to pump into the deionized water concentrate, and repeat concentration and washing until the solid content is 15%. 3 Solution test without Cl - If it is detected or the conduc...

Embodiment 2

[0034]Example 2 Take 300L of seawater treated by a 0.2 μm hollow fiber microfiltration membrane, inject it into a nanofiltration membrane system through a high-pressure pump, and concentrate it to 1 / 3 of the volume of the raw material liquid, and put the concentrated liquid into a nanofiltration concentrated liquid tank. Analyze the concentration of calcium ions in the concentrate, according to 1.38:1Na 2 CO 3 / Ca 2+ The molar ratio, add 1mol / L sodium carbonate solution, react 3h under the condition of stirring speed 80r / min, stand still for 24h, supernatant is poured into the magnesium hydroxide raw material bucket. Add polyethylene glycol 1000, a dispersing agent with a theoretical magnesium hydroxide production rate of 2% in the magnesium raw material tank, and stir and mix evenly. The 1.8mol / L sodium hydroxide solution is mixed, fully reacted through the static mixer, and directly enters the 50nm ceramic ultrafiltration membrane unit. After being concentrated to a solid...

Embodiment 3

[0035] Example 3 Take 160L of concentrated seawater produced by the reverse osmosis membrane. After analyzing the concentration of calcium and magnesium ions, 2 CO 3 / Ca 2+ Add 1.5mol / L sodium carbonate solution, react for 30min under the condition of stirring speed of 100r / min, change the stirring speed of 40r / min for 4h, stand still for 24h, after centrifugal separation and concentration, put the filtrate into magnesium hydroxide raw material in the barrel. Add polyethylene glycol 1000, a dispersing agent with a theoretical magnesium hydroxide production rate of 2% in the magnesium raw material tank, and stir and mix evenly. The 1.5mol / L sodium hydroxide solution is mixed, fully reacted by the static mixer, and directly enters the 50nm ceramic ultrafiltration membrane unit. When concentrated by ceramic ultrafiltration membrane to a solid content of 20%, use a centrifugal pump to inject deionized water into the concentrated solution, and repeatedly concentrate and wash unt...

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Abstract

The invention relates to a production method of superfine powder of magnesium hydroxide by distilling seawater. The method adopts desalted water as raw material. Calcium carbonate deposition is formed and separated out by adding precipitator carbonate. Then filtrate that contains magnesium is adopted as raw liquid and a proper amount of dispersant polyglycol 1000 is added, a mixture is formed. Then the mixture is driven into an ejector by a centrifugal pump and reacts with alkali solution in a static mixer. The alkali solution is driven by a metering pump from an alkali solution tank into the static mixer. A material, in which solid material content is more than 15 percent, is made by concentration through a 10-100nm ceramic ultrafiltration membrane. Then the material is washed until the washing water conductivity permeating the ceramic membrane is less than 200.0 Mus/cm. Finally, the slurry of magnesium hydroxide is dried by a spray drier. The technique of the invention is simple and has high automation degree, high profit, but low cost, and is easy to be operated, and overcomes the problem of low yield rate caused by the next two reasons that particle agglomeration of magnesium hydroxide can not be controlled and the fine particles can not be closured by adopting the conventional technique in prior art. Meanwhile, the concentration and the washing are realized in a ceramic ultrafitration membrane unit, and the problem of particle agglomeration of the magnesium hydroxide caused by the existence of large quantities of chloride ion is thoroughly solved.

Description

technical field [0001] The invention relates to the purification of seawater in the seawater desalination process, in particular to a production method for extracting high-purity ultrafine powdered magnesium hydroxide from seawater. The concentrated brine produced by nanofiltration and reverse osmosis membrane can be produced by sodium hydroxide precipitation Produce high-purity ultra-fine powder inorganic flame retardant magnesium hydroxide. Background technique [0002] As an important chemical product and intermediate, magnesium hydroxide has been widely used in ceramic materials, environmental protection, medicine and other fields. In recent years, due to its high decomposition temperature, high thermal stability, non-toxic, smoke-free and smoke-suppressing characteristics (most properties are better than aluminum hydroxide), it has developed rapidly in the field of inorganic flame retardants. . [0003] At present, there are two ways to produce magnesium hydroxide ino...

Claims

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Application Information

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IPC IPC(8): C01F5/14C09K21/02
Inventor 马敬环
Owner 天津海泽惠科技发展有限公司
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