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Method for preparing ultra-fine high dispersing magnesium hydrate flame retardant from saline lake bittern or bischofite

A bischofite and salt lake brine technology, applied in the direction of magnesium hydroxide, etc., can solve the problems of environmental salt lake brine resource pollution, salt lake phase balance destruction, magnesium salt enrichment, etc., and achieve low production cost, convenient operation, and simple process Effect

Active Publication Date: 2009-07-08
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The brine after the production of potassium fertilizers is used as waste liquid, and is discharged into the salt lake by pipelines, channels, pump stations and other facilities, resulting in local enrichment of magnesium salts and destroying the phase balance of the salt lake. This not only causes waste of resources, but also causes Serious pollution of the environment and salt lake brine resources

Method used

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  • Method for preparing ultra-fine high dispersing magnesium hydrate flame retardant from saline lake bittern or bischofite
  • Method for preparing ultra-fine high dispersing magnesium hydrate flame retardant from saline lake bittern or bischofite
  • Method for preparing ultra-fine high dispersing magnesium hydrate flame retardant from saline lake bittern or bischofite

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Example 1: Take a certain amount of water and put it in a beaker, and continuously add bischofite, which is rich in salt lakes, under low-speed stirring until the bischofite is no longer dissolved, and filter to remove insoluble impurities, and the concentration is 3.45mol / L of magnesium chloride solution. Get 500mL of magnesium chloride solution of 3.45mol / L and join in the constant temperature reaction kettle, heat up to 45 DEG C under the stirring rate of 2000rpm, add the ammoniacal liquor that concentration is 6.68mol / L with the flow rate of 70mL / min under the constant temperature condition of 45 DEG C, the ammoniacal liquor The feeding time is 11 minutes. After the ammonia water is completely fed, continue to react at a constant temperature of 45°C and a stirring rate of 2000rpm for 60 minutes. fuel products. The laser particle size analyzer test results are shown in Table 1, and the particle size distribution is as follows figure 1 shown.

[0023] Table 1 Part...

Embodiment 2

[0026] Example 2: Take a certain amount of water and put it in a beaker, and continuously add bischofite, which is rich in salt lakes, under low-speed stirring until the bischofite is no longer dissolved, filter to remove insoluble impurities, and make a concentration of 3.00mol / L of magnesium chloride solution. Take 500mL of 3.00mol / L magnesium chloride solution and add it to a constant temperature reaction kettle, raise the temperature to 75°C at a stirring rate of 2500rpm, and add 3mol / L ammonia water at a flow rate of 80mL / min at a constant temperature of 75°C, the feeding time of ammonia water The reaction time is 7.37min. After the ammonia water is completely fed, the reaction is continued at a constant temperature of 75°C and a stirring rate of 2500rpm for 20min, and then the slurry is washed, filtered, and vacuum-dried at 120°C to obtain a magnesium hydroxide product with a median diameter of 0.69μm. The laser particle size analyzer test results are shown in Table 2, ...

Embodiment 3

[0030] Example 3: Take a certain amount of water and put it in a beaker, continuously add bischofite, which is rich in salt lakes, under low-speed stirring, until the bischofite no longer dissolves, filter to remove insoluble impurities, and make a concentration of 3.21mol / L of magnesium chloride solution. Take 500 mL of 3.21 mol / L magnesium chloride solution and add it to a constant temperature reactor, heat up to 60°C at a stirring rate of 2000rpm, and add 6.28mol / L ammonia water at a flow rate of 70mL / min at a constant temperature of 60°C. The time is 11 minutes. After the ammonia water is completely fed, the reaction is continued for 60 minutes at a constant temperature of 60°C and a stirring rate of 2000rpm, and then the slurry is washed, filtered, and vacuum-dried at 120°C to obtain a magnesium hydroxide product with a median diameter of 0.87μm. The laser particle size analyzer test results are shown in Table 3, and the particle size distribution is as follows image 3...

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Abstract

The invention provides a method for preparing an ultrafine high-dispersion magnesium hydroxide flame retardant by taking salt lake brine or bischofite as a raw material, which comprises the following steps that: the salt lake brine or the bischofite is prepared into a solution with 3 to 4mol / L magnesium chloride, 3 to 14mol / L ammonia water is quickly added into the solution at a temperature of between 25 and 95 DEG C to perform a precipitation reaction, and then an ultrafine high-dispersion magnesium hydroxide flame retardant product can be obtained through washing, filtration and drying. The method has simple process flow and low cost, and can produce the magnesium hydroxide flame retardant with good dispersivity, evenly distributed particle size, and average grain diameter of between 0.5 and 1mu m without adding a dispersing agent and a flocculating agent during the reaction.

Description

technical field [0001] The invention belongs to the technical fields of material chemistry and chemical industry, and relates to a preparation process of magnesium hydroxide, in particular to a method for preparing an ultrafine highly dispersed magnesium hydroxide flame retardant by using salt lake brine or bischofite as raw materials. technical background [0002] Magnesium hydroxide flame retardant, as an efficient, superior and environmentally friendly new additive inorganic flame retardant, has made great progress in the field of inorganic flame retardants. The product is non-toxic, odorless and non-corrosive. Magnesium hydroxide has a high thermal decomposition temperature, and the thermal decomposition temperature is between 340 ° C and 490 ° C. When it is thermally decomposed, it releases water and absorbs a large amount of latent heat, which reduces the actual temperature of the resin in the flame. The decomposition of substances and the cooling effect produced by f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F5/20C09K21/02
Inventor 刘志启李丽娟聂峰曾忠民宋富根姬连敏
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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