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Technology for producing and preparing high-purity lamellar magnesium hydroxide

A magnesium hydroxide and preparation technology, applied in the direction of magnesium hydroxide, etc., can solve the problems of high cost, high energy consumption, difficult filtration, etc., and achieve the effect of low production cost and easy large-scale production

Inactive Publication Date: 2010-05-05
钟辉
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But this method magnesium precipitation rate is low (about 60%), and ammonia recovery is difficult, and its cost is higher; Traditional sodium hydroxide method and calcium hydroxide method have technological process simple operation, the characteristics of lower cost, and this method is due to precipitation Magnesium hydroxide has a strong driving force, and the generated magnesium hydroxide is colloidal, which is extremely difficult to filter, and the purity of magnesium hydroxide can only reach 70-90%.
The hydrothermal method is to carry out hydrothermal modification on the magnesium hydroxide obtained through the precipitation reaction at a temperature of 150-200 ° C and a pressure of 4-10 atmospheres, so that the magnesium hydroxide is transformed from a colloid to a crystalline precipitation. This method has product purity. High (≥99%), good crystal form (flaky) advantages, but the reaction is carried out under high temperature and high pressure, high energy consumption, high cost, poor safety, difficult to achieve large-scale industrial production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] 4mol / L magnesium chloride and 8mol / L sodium hydroxide solutions were prepared with industrial grade magnesium chloride and industrial grade sodium hydroxide and water at room temperature. Take 200ml of water and add it to a 3L beaker, place it in a water bath, keep the temperature at 50℃, stir, and stir at a speed of 60~90r / min. At the same time, add the prepared NaOH 2050ml and MgCl in parallel 2 1000ml, magnesium chloride solution adding speed 20mL / min, sodium hydroxide solution adding speed 39mL / min; after 10 minutes of reaction, add 6 grams of analytically pure polyacrylamide at one time, and add 30 grams of analytically pure octadecylamine hydrochloride at a time. After the reaction materials are added, use the above sodium hydroxide solution to control the end of the reaction pH≥13. After the reaction is complete, take it out of the water bath after aging for 10 minutes, then vacuum filter with a cloth funnel, wash with 1600ml distilled water, and settle at 105°C Dr...

Embodiment 2

[0019] 4mol / L magnesium chloride and 8mol / L sodium hydroxide solutions were prepared with industrial grade magnesium chloride and industrial grade sodium hydroxide and water at room temperature. Take 300ml of magnesium hydroxide aqueous solution slurry (magnesium hydroxide content of 25%) and add it to a 3L beaker, place it in a water bath, keep the temperature at 85°C, stir at a stirring speed of 60-90r / min, and add it in parallel. Prepared NaOH 2050ml, MgCl 2 1000ml, magnesium chloride solution adding rate 10mL / min, sodium hydroxide solution adding rate 18mL / min; at the same time, add 15ml of analytically pure ammonia water in two times, the first time when the reaction starts, the second time when the reaction has proceeded for 70 minutes Add; After the reaction material is added, use the above sodium hydroxide solution to control the end of the reaction pH ≥ 14. After the reaction is complete, take it out of the water bath after aging for 100 minutes, then use a cloth funnel...

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Abstract

The invention provides a technology for producing and preparing high-purity lamellar magnesium hydroxide, which can solve the problem that the magnesium hydroxide is difficult to filter, so that the purity is difficult to improve. The basic technology comprises the following steps: taking bischofite or magnesium chloride as a main raw material, taking hydrogen sodium as a main precipitating agent, adding crystal seeds before the reaction, carrying out liquid phase precipitation reaction at 15-100 DEG C, simultaneously adding a crystal accelerator, and sequentially carrying out thermal insulation aging, filtering, washing and drying after the reaction is finished, thereby obtaining the lamellar magnesium hydroxide with the purity of more than 99%. The technology can solve the problem that the magnesium hydroxide is difficult to filter and has the advantages of simple technology, low cost and high utilization rate of magnesium.

Description

Technical field [0001] The invention relates to a preparation process of high-purity flake magnesium hydroxide, which belongs to the technical field of inorganic chemical processes. Background technique [0002] As an important inorganic compound of magnesium series, magnesium hydroxide has the advantages of non-toxic, non-volatile, no corrosive gas, sulfur absorption, flame retardant, smoke reduction, etc. It is widely used in plastics, food industry, wastewater treatment, and flue gas Desulfurization and medicine and other fields. [0003] The market demand for magnesium hydroxide is increasing year by year, and the use of salt lake magnesium resources to produce high-purity magnesium hydroxide has huge economic benefits. Since magnesium hydroxide is generally colloidal precipitation and difficult to filter, how to prepare high-purity flaky magnesium hydroxide has always been a difficult problem for researchers to explore. Sodium hydroxide method, calcium hydroxide method, ammo...

Claims

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Application Information

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IPC IPC(8): C01F5/22
Inventor 钟辉付烨黄巍
Owner 钟辉
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