Method for preparing alkaline brucite crystal whisker by directly adding bittern into alkali liquid

A technology of brucite and basic type, which is applied in the field of preparation of basic brucite whiskers, can solve the problems of increasing production cost and removing impurities, and achieve the effect of high-value utilization

Active Publication Date: 2015-07-01
LINGNAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

And in the prior art, although there is the method of adding weak bases such as ammoniacal liquor and sodium carbonate in bittern to produce basic brucite whiskers, this preparation method will remove impurities, and the bittern must be prepared in advance. Certain ions in the halogen are pre-separated or removed, and generally a high-temperature and high-pressure reaction is used, and only one type of basic brucite whisker can be generated, which inevitably increases the production cost and also puts higher demands on the production equipment. requirements, there are large limitations in industrial applications

Method used

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  • Method for preparing alkaline brucite crystal whisker by directly adding bittern into alkali liquid
  • Method for preparing alkaline brucite crystal whisker by directly adding bittern into alkali liquid
  • Method for preparing alkaline brucite crystal whisker by directly adding bittern into alkali liquid

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Experimental program
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Effect test

Embodiment 1

[0024] Get the bittern bittern sample of 1.0L, measure wherein the concentration of magnesium ion in the bittern is 3.0mol / L, add the sodium hydroxide solution 0.5L of 0.4mol / L in the bittern under stirring state, the adding speed of sodium hydroxide is 50mL / min, after the lye was added, the reaction system was allowed to stand at 35°C for 48 hours, then filtered, washed 5 times to precipitate, and dried at 75°C to obtain 36.6g of basic brucite whiskers, of which basic magnesium chloride Whiskers account for 92%, basic magnesium sulfate whiskers account for 6%, and basic magnesium carbonate whiskers account for 2%, all of which are mass fractions. The aspect ratio of the whiskers is about 20:1, and XRD diffraction proves that the product is a mixture of three basic brucite whiskers. The whiskers are of high quality and fully meet the requirements for industrial applications.

Embodiment 2

[0026] Get the bittern bittern sample of 1.0L, measure wherein the concentration of magnesium ion in the bittern is 2.0mol / L, add the sodium hydroxide solution 0.22L of 0.6mol / L in the bittern under stirring state, the adding speed of sodium hydroxide is 30mL / min, and then left to react at 30°C for 48h, then filtered, washed with water for 5 times, and dried at 50°C to obtain 21.43g of basic brucite whiskers, of which basic magnesium chloride whiskers accounted for 91%, and basic Magnesium sulfate whiskers account for 7%, basic magnesium carbonate whiskers account for 2%, and the above are all mass fractions. The aspect ratio of the whiskers is about 18:1, and XRD diffraction proves that the product is a mixture of three basic brucite whiskers. The whiskers are of high quality and fully meet the requirements for industrial applications.

Embodiment 3

[0028] Get the bittern bittern sample of 1.0L, measure wherein the concentration of magnesium ion in the bittern is 1.0mol / L, add the sodium hydroxide solution 0.067L of 1.0mol / L in the bittern under stirring state, the adding speed of sodium hydroxide is 20mL / min, then left to react at 38°C for 48h, then filtered, washed 5 times to precipitate, and dried naturally to obtain 12.25g basic brucite whiskers, of which basic magnesium chloride whiskers accounted for 89%, and basic magnesium chloride whiskers accounted for 89%. Magnesium sulfate whiskers account for 8%, basic magnesium carbonate whiskers account for 3%, and the above are all mass fractions. The aspect ratio of the whiskers is about 16:1, and XRD diffraction proves that the product is a mixture of three basic brucite whiskers. The whiskers are of high quality and fully meet the requirements for industrial applications.

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Abstract

The invention discloses a method for preparing an alkaline brucite crystal whisker by directly adding bittern into alkali liquid. The method comprises the following steps: measuring the concentration of magnesium ions in the bittern; adding 0.4mol/L to 1.0mol/L of a sodium hydroxide solution into the bittern while stirring; subsequently reacting for 48h at the temperature of 30 to 38 DEG C; and filtering, washing precipitates and drying to obtain the alkaline brucite crystal whisker, wherein the mole ratio of sodium hydroxide to the magnesium ions is 1 to 15, and the adding speed of sodium hydroxide is 20mL/min to 50mL/min. By controlling the addition amount, adding speed and adding concentration of the alkali liquid, the method disclosed by the invention can be used for simultaneously obtaining three types of alkaline brucite crystal whiskers; the length to diameter ratio of the three types of alkaline brucite crystal whiskers satisfies the requirements of the crystal whiskers; the purity of the crystal whiskers satisfies the requirements of industrial application; high-value utilization of magnesium resources in a salt field is realized.

Description

technical field [0001] The invention belongs to the technical field of preparation of inorganic materials, and in particular relates to a method for preparing basic brucite whiskers by directly adding bittern to lye. Background technique [0002] Bittern, also known as "old brine", is rich in magnesium chloride. It is a by-product after brine is exposed to the sun to produce salt, or after brine is industrially extracted from potassium and sodium salts. It is usually discharged as "waste liquid". However, the concentration of magnesium ions in this by-product is very high, and it is an excellent raw material for preparing magnesium salt whiskers. my country's sea salt production has reached more than 22 million t / a, ranking first in the world's sea salt production, and the corresponding by-product bittern total amounted to 18 million m 3 , is a kind of liquid mineral resource that is both abundant and sustainable. [0003] The scientific use of these bittern magnesium reso...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B7/14C30B29/62C30B29/10
Inventor 吴健松
Owner LINGNAN NORMAL UNIV
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