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Calcium-aluminum hydrotalcite and preparation method thereof

A calcium-aluminum hydrotalcite, calcium source technology, applied in chemical instruments and methods, aluminum compounds, aluminum carbonate compounds, etc. Problems such as low utilization of talc atoms

Pending Publication Date: 2019-08-02
ZHAOQING UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the process of preparing calcium-aluminum hydrotalcites by these methods, soluble salts such as calcium nitrate and aluminum nitrate are usually used as main raw materials, and the mass fractions of calcium and aluminum elements available in such raw materials are not more than 20%; and the preparation process Among them, on the one hand, the traditional method of synthesizing calcium-aluminum hydrotalcites does not follow the "rapid nucleation mechanism", and the radius of calcium ions is quite different from that of magnesium ions, so it is difficult to replace magnesium in hydrotalcites. CaCO 3 , Ca 3 al 2 (OH) 12 The formation rate is much faster than that of calcium aluminum hydrotalcites. On the other hand, CaCO 3 , Ca 3 al 2 (OH) 12 The thermal stability of calcium aluminum hydrotalcites is much greater than that of calcium aluminum hydrotalcites, making it easier for carbonate or hydroxide to form stable CaCO with calcium and aluminum ions. 3 , Ca 3 al 2 (OH) 12 Impurities
Therefore, the calcium-aluminum hydrotalcite prepared has a low atomic utilization rate, produces many by-products, and is difficult to separate the by-product from the main product calcium-aluminum hydrotalcite, so the calcium-aluminum hydrotalcite product obtained has low purity, which seriously affects the calcium-aluminum hydrotalcite. Properties of talc

Method used

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  • Calcium-aluminum hydrotalcite and preparation method thereof
  • Calcium-aluminum hydrotalcite and preparation method thereof

Examples

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preparation example Construction

[0025] The invention provides a preparation method of calcium aluminum hydrotalcite, comprising the following steps:

[0026] (1) mixing a calcium source, an aluminum source, a stabilizer and water to obtain a mixed material liquid, and reacting the mixed material liquid to obtain an intermediate slurry;

[0027] The anions in the mixture liquid contain OH - and a complex anion; the complex anion comprises Cl - , F - , SO 4 2- , NO 3 -, PO 4 3- and HPO 4 2- one or more of

[0028] (2) mixing the intermediate slurry with an alkaline salt solution for crystallization to obtain calcium-aluminum hydrotalcite.

[0029] In the present invention, unless otherwise specified, all components are commercially available products well known to those skilled in the art.

[0030] In the present invention, calcium source, aluminum source, stabilizer and water are mixed to obtain a mixed material liquid, and the mixed material liquid is reacted to obtain an intermediate slurry. In ...

Embodiment 1

[0042] Dissolve 236.2g of calcium nitrate tetrahydrate and 187.6g of aluminum nitrate nonahydrate in 1000mL of water to make a mixed salt solution, while dissolving 140g of sodium hydroxide and 87.6g of sodium chloride in 500mL of water to make a stabilizer solution, then Mix the mixed salt solution and the stabilizer solution, and react at 130° C. for 2 hours to obtain an intermediate slurry.

[0043] Dissolve 26.5g of anhydrous sodium carbonate in 500mL of water to obtain a sodium carbonate solution, then mix the intermediate slurry with the sodium carbonate solution, crystallize at 160°C for 14h, then cool to 80°C and filter, collect the obtained filtrate and return to Used for the preparation of the intermediate slurry, the obtained filter cake is dried at 60° C. and then pulverized to obtain calcium-aluminum hydrotalcite.

[0044] The intermediate slurry of Example 1 is filtered, dried and ground to obtain an intermediate solid substance, which is subjected to an XRD test...

Embodiment 2

[0046] 74g of calcium hydroxide and 39g of aluminum hydroxide were added to 1800mL of the filtrate recovered in Example 1. The anion concentration of the stabilizer in the filtrate was 2.72mol / L, and reacted at 110°C for 3h to obtain an intermediate slurry.

[0047] Dissolve 21g of sodium bicarbonate in 500mL of water to obtain a sodium bicarbonate solution, then mix the intermediate slurry with the sodium bicarbonate solution, crystallize at 140°C for 10h, then cool to 80°C and press filter to collect the resulting filtrate It is recovered and reused for the preparation of intermediate slurry, and the obtained filter cake is dried at 60° C. and then pulverized to obtain calcium-aluminum hydrotalcite.

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Abstract

The invention belongs to the technical field of preparation of hydrotalcite-like compounds, and particularly relates to calcium-aluminum hydrotalcite and a preparation method thereof. The preparationmethod of calcium-aluminum hydrotalcite provided by the invention comprises the following steps: step (1) mixing a calcium source, an aluminum source, a stabilizer and water to obtain mixed liquid, and carrying out a reaction to obtain intermediate slurry, wherein anions in the mixed liquid contain OH<-> and complex anion; the complex anion contains one or more of Cl<->, F<->, SO4<2->, NO3-, PO4<3-> and HPO4<2->; and step (2) mixing and crystallizing the intermediate slurry and an alkaline salt solution to obtain the calcium-aluminum hydrotalcite. The preparation method provided by the invention follows a 'rapid nucleation mechanism'; and an intermediate is generated during preparation to avoid CaCO3 and other impurities generated by direct contact of calcium ions and aluminum ions and anions of an alkali solution, so that the prepared calcium-aluminum hydrotalcite has uniform crystal phase and high purity.

Description

technical field [0001] The invention belongs to the technical field of preparation of hydrotalcite compounds, and in particular relates to a calcium-aluminum hydrotalcite and a preparation method thereof. Background technique [0002] Calcium-aluminum hydrotalcite is a double metal hydroxide with a layered structure, and its typical chemical formula is Ca 4 al 2 (OH) 12 (CO 3 )(H 2 O) 5 , with adjustable composition and structure, alkaline and other properties, widely used in PVC heat stabilizers, construction, water pollution treatment and other fields. [0003] In the prior art, calcium-aluminum hydrotalcites can be prepared in one step by co-precipitation, hydrothermal, microwave synthesis and other methods. However, in the process of preparing calcium-aluminum hydrotalcites by these methods, soluble salts such as calcium nitrate and aluminum nitrate are usually used as main raw materials, and the mass fractions of calcium and aluminum elements available in such raw...

Claims

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Application Information

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IPC IPC(8): C01F7/00
CPCC01P2002/22C01F7/782
Inventor 郝向英沈冠华赵闫华袁国栋廖晓龙邹湘源
Owner ZHAOQING UNIV
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