Method for preparing laminated composite metal hydroxide

A hydroxide and layered composite technology, applied in the direction of oxide/hydroxide preparation, etc., can solve the problems of unclean preparation method, difficulty in industrialization, high cost of raw materials, etc., to protect the environment, overcome high cost, and save water resource effect

Inactive Publication Date: 2010-12-08
BEIJING UNIV OF CHEM TECH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0006] The purpose of the present invention is to overcome the shortcomings of the prior art that the preparation method of layered composite metal hydroxide is not clean or the cost of raw materials is high, and it is difficult to realize industrialization, and to provide a layered composite metal hydroxide that is clean, has low raw material cost, and can realize industrialization. The preparation method of hydroxide

Method used

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  • Method for preparing laminated composite metal hydroxide
  • Method for preparing laminated composite metal hydroxide
  • Method for preparing laminated composite metal hydroxide

Examples

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preparation example Construction

[0012] The preparation method of layered composite metal hydroxide provided by the invention comprises: M(OH) 2 and N(OH) 3 Mix at a molar ratio of 2-4:1, then react with an acidic aqueous solution at 100-300°C for 0.1-10 days under stirring conditions, and use M(OH) 2 and N(OH) 3 The total weight is 1 part by weight, and the consumption of the acidic aqueous solution is 1-1000 parts by weight; the acid and N(OH) in the acidic aqueous solution 3 The molar ratio of N is (n-1): 1 to (n+1): 1, n represents the number of hydrogen per molecule of acid, for example, for sulfuric acid H 2 SO 4 and carbonic acid H 2 CO 3 , the number of hydrogen in each molecule of acid is 2, that is, sulfuric acid H 2 SO 4 and carbonic acid H 2 CO 3 The n is 2. The M(OH) 2 For brucite or brucite and Zn(OH) 2 , Ca(OH) 2 、Cu(OH) 2 , Ni(OH) 2 、Co(OH) 2 , Fe(OH) 2 , Mn(OH) 2 , Cd(OH) 2 and Be(OH) 2 One or a mixture of several of them; N(OH) 3 For pseudo-boehmite or pseudo-boehmite an...

Embodiment 1

[0026] This example is used to illustrate the preparation method of the layered composite metal hydroxide provided by the present invention.

[0027] (1) Treatment of brucite

[0028] The main component of the brucite (Dandong Tianci Flame Retardant Material Technology Co., Ltd.) used is: Mg(OH) 2 96.47% by weight, CaO 0.45% by weight, Fe 2 o 3 0.48% by weight, Al 2 o 3 0.14% by weight, SiO 2 2.26% by weight.

[0029] The above-mentioned brucite of 5000 meshes and deionized water are mixed in a ratio of 20: 100 by weight, and pulverized for 30 minutes at a speed of 3000 rpm with a colloid mill (Shenyang Aerospace Xinguang Superfine Grinding Machinery Co., Ltd., JTM51AB type), and then All the obtained products were added to the reaction kettle. Under the condition of stirring, the temperature in the kettle was raised to 350°C, and the reaction was carried out under the pressure of 17MPa for 32 hours, and the obtained product was filtered and dried at 70°C for 8 hour...

Embodiment 2

[0035] This example is used to illustrate the preparation method of the layered composite metal hydroxide provided by the present invention.

[0036] (1) Treatment of brucite

[0037] The main component of the brucite (Dandong Tianci Flame Retardant Material Technology Co., Ltd.) used is: Mg(OH) 2 96.47% by weight, CaO 0.45% by weight, Fe 2 o 3 0.48% by weight, Al 2 o 3 0.14% by weight, SiO 2 2.26% by weight.

[0038] The above-mentioned brucite of 500 meshes and deionized water are mixed in a ratio of 30: 100 by weight, pulverized for 10 minutes at a speed of 8000 rpm with a colloid mill (Shenyang Aerospace Xinguang Superfine Grinding Machinery Co., Ltd., JTM51AB type), and then All the obtained products were added to the reaction kettle. The temperature in the kettle was raised to 300° C. with stirring, and the reaction was carried out under a pressure of 8.7 MPa for 6 hours, and the obtained product was filtered and dried at 90° C. for 6 hours.

[0039] (2) Prep...

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Abstract

The invention discloses a method for preparing a laminated composite metal hydroxide, comprising the following steps of: mixing M(OH)2 and N(OH)3 according to the molar ratio of 2-4:1; and subjecting the mixture and an acid water solution to a reaction for 0.1-10 days at 100-300DEG C under the stirring condition, wherein the consumption of the acid water solution is 1-1,000 parts by weight, on the basis of the total weight of M(OH)2 and N(OH)3 as 1 part by weight, the molar ratio of acid in the acid water solution to N in the N(OH)3 is (n-1):1 to (n+1):1 and n expresses the number of nitrogen in each molecule of acid. When the laminated composite metal hydroxide is prepared from the method, various components in raw materials participate in the reaction to generate a target product or water molecule, no side product is generated in the process, water resources are saved and the environment is protected. In addition, in the method, by using brucite and pseudo-boehmite with low price as raw materials, the invention overcomes the defects that the clean preparation method in the prior art requires raw materials with high cost and is difficult to be applied to industrial production.

Description

technical field [0001] The invention relates to a preparation method of layered composite metal hydroxide. Background technique [0002] Layered double hydroxides (LDHs for short), also known as hydrotalcite, is a typical anionic layered material, and its chemical composition formula is [M 2+ 1-x N 3+ x (OH) 2 ]A n- x / n mH 2 O, where M 2+ , N 3+ is a metal cation, A n- is an interlayer anion, x is N 3+ The mole fraction of ions, m is the number of crystal water. The element types and composition ratios of the main laminates of LDHs, and the types and quantities of interlayer objects can be adjusted in a wide range according to needs, so as to obtain materials with special structures and properties. The adjustable composition and structure of LDHs and the resulting multifunctionality make them a class of new materials with great research potential and application prospects, and are widely used in the fields of catalysis, adsorption, ion exchange and functional mat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B13/14
Inventor 徐向宇宋家庆林彦军李殿卿段雪
Owner BEIJING UNIV OF CHEM TECH
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