Method for producing flower-like sphere type nanometer magnesium hydroxide with characteristics of light weight and high specific surface area

A nano-magnesium hydroxide, magnesium hydroxide technology, applied in the direction of magnesium hydroxide, nanotechnology for materials and surface science, nanotechnology, etc., can solve problems such as low purity, complicated operation, and large particle size of the product. Achieve the effects of easy mass synthesis, simple equipment, and uniform particle size

Active Publication Date: 2015-06-24
FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] 1. If the produced product has large particle size, low purity and uneven particle size distribution;
[0010] 2. Disadvantages such as high equipment requirements, harsh conditions, complicated operation, and low product yield,
[0011] 3. Difficult industrialization, low output and high cost
[0012] 4. The process of producing magnesi

Method used

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  • Method for producing flower-like sphere type nanometer magnesium hydroxide with characteristics of light weight and high specific surface area
  • Method for producing flower-like sphere type nanometer magnesium hydroxide with characteristics of light weight and high specific surface area
  • Method for producing flower-like sphere type nanometer magnesium hydroxide with characteristics of light weight and high specific surface area

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] A. Prepare a mixed solution of ethanol and water at a ratio of 1:1 in a reaction vessel, prepare a 0.5mol / L magnesium sulfate solution in this mixed solution, add 30% (mass fraction) of glycerol, and mix well.

[0063] B. Prepare a mixed solution of ethanol and water at a ratio of 1:4 in a container, and prepare a 1mol / L sodium hydroxide solution in this mixed solution.

[0064] C. At room temperature, slowly drop 1L of the solution described in B into 1L of the solution described in A, and at the same time stir the reaction at a stirring speed of 700 rpm for 20 hours, and a white precipitate was obtained in the reaction vessel A. After aging for 2 hours, the white precipitate Filter, wash with deionized water several times until there is no sulfate ion, then wash with absolute ethanol to obtain a white solid, dry the white solid at 60°C to constant weight, and obtain a light, high specific surface area (90m 2 / g), curd-shaped nano-magnesium hydroxide.

Embodiment 2

[0066] A. Prepare a 0.5 mol / L magnesium sulfate aqueous solution in a reaction vessel, add 30% (mass fraction) glycerol, and mix well.

[0067] B. Prepare 1mol / L sodium hydroxide aqueous solution in a container.

[0068] C. At room temperature, slowly drop 1L of the solution described in B into 1L of the solution described in A, while stirring the reaction at a stirring speed of 700 rpm for 15 hours, a white precipitate was obtained in reaction vessel A, and after aging for 1.5 hours, the white Filter the precipitate, wash with deionized water for several times until there is no sulfate ion, and then wash with absolute ethanol to obtain a white solid. Dry the white solid at 100°C to constant weight to obtain a light, high specific surface area ( 110m 2 / g), curd-shaped nano-magnesium hydroxide.

Embodiment 3

[0070] A. Prepare a 0.5 mol / L magnesium chloride aqueous solution in a reaction vessel, add 15% (mass fraction) glycerol, and mix well.

[0071] B. Prepare a 1mol / L potassium hydroxide aqueous solution in a container, add 15% (mass fraction) glycerol, and mix well.

[0072] C. At room temperature, slowly drop 1L of the solution described in B into 1L of the solution described in A, and at the same time stir the reaction at a stirring speed of 700 rpm for 8 hours, and a white precipitate was obtained in the reaction vessel A. After aging for 3 hours, the white precipitate Centrifugal cleaning, washing several times with deionized water until there is no chloride ion, and then washing once with absolute ethanol to obtain a white gel-like solid, dry the white solid at 150°C to constant weight to obtain a light, high specific Surface area (70m 2 / g), curd-shaped nano-magnesium hydroxide.

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Abstract

The present invention discloses a method for producing flower-like sphere type nanometer magnesium hydroxide with characteristics of light weight and high specific surface area. The method comprises: (1) preparing a magnesium salt aqueous solution with a certain concentration in a reaction container; (2) preparing an alkaline solution with a certain concentration in a container; (3) adding a certain amount of a dispersing agent to the solution obtained in the step (1) or solution obtained in the step (2) before a reaction; and (4) slowly adding the solution obtained in the step (2) to the solution obtained in the step (1) in a dropwise manner, or slowly adding the solution obtained in the step (1) to the solution obtained in the step (2) in a dropwise manner, reacting to obtain a white precipitate, aging, and carrying out centrifugation washing on the white precipitate (magnesium hydroxide) so as to remove other impurity ions through the washing to obtain the white gelatinous solid. According to the present invention, the special shape magnesium hydroxide preparation method with characteristics of easy operation, no environmental pollution, easy amplification and low equipment requirement is provided, and the magnesium hydroxide synthesized by the method of the present invention is mainly used for printing and dyeing wastewater treatments, heavy metal ion adsorption, and flue gas desulfurization agents.

Description

technical field [0001] The invention belongs to the technical field of inorganic material preparation. Specifically, it is a method for producing nano-magnesium hydroxide with a special shape by using alkali and magnesium salt to react under the condition of adding a dispersant. Background technique [0002] Magnesium hydroxide has advantages that other inorganic materials do not have. Because of its good thermal stability, high decomposition temperature, non-toxicity, and smoke suppression, it is traditionally used as a high-performance inorganic flame retardant in polymer materials. It is widely used in acid rain soil treatment, food and feed additives, and biological and pharmaceutical preparations. It is a recognized environment-friendly green chemical product. At present, magnesium hydroxide has been valued by various countries, and it is one of the products favored and respected by developed countries in the process of implementing sustainable development strategies, ...

Claims

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Application Information

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IPC IPC(8): C01F5/14B82Y30/00B82Y40/00
CPCC01F5/14C01P2002/72C01P2004/03C01P2004/24C01P2004/61C01P2006/12
Inventor 林璋陈伦泰王永好吴智诚洪杨平黄嘉魁
Owner FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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