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Method for preparing calcium aluminum hydrotalcite used as concrete additive

A technology of concrete admixture and hydrotalcite, applied in chemical instruments and methods, aluminum compounds, calcium/strontium/barium compounds, etc., can solve the problems of long process steps and time-consuming

Inactive Publication Date: 2008-08-13
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, nitrogen protection and strict pH control are required in the operation, and the process operation steps are long and time-consuming, and only stay in the laboratory research stage, so a new and simple method is needed to realize the synthesis of calcium aluminum hydrotalcite. industrial production

Method used

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  • Method for preparing calcium aluminum hydrotalcite used as concrete additive
  • Method for preparing calcium aluminum hydrotalcite used as concrete additive

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 79.6g of aluminum chloride hexahydrate and 97.0g of calcium chloride dihydrate were simultaneously dissolved in a mixed solution containing 670mL of deionized water and 330mL of anhydrous methanol. Dissolve 100 g of sodium hydroxide in another mixed solution of 670 mL of deionized water and 330 mL of anhydrous methanol. First adjust the slit of the total back-mixing explosive nucleation reactor to 2. Use a peristaltic pump to simultaneously pump the salt solution and the alkali solution into the total back-mixing explosive nucleation reactor at a speed of 200 ppm, and adjust the voltage to 100 to turn on the colloid mill for stirring. A 5L crystallization vessel was used to terminate the reacted slurry under the fully back-mixed explosive nucleation reactor. After the reaction was completed, the crystallization container was placed in a crystallization heater whose temperature was set at 70° C. for 1 day. Then the crystallization container was taken out and cooled to ...

Embodiment 2

[0027] 39.8g of aluminum chloride hexahydrate and 48.5g of calcium chloride dihydrate were simultaneously dissolved in a mixed solution containing 300mL of deionized water and 200mL of n-propanol. Dissolve 47.5 g of sodium hydroxide in another mixed solution of 300 mL of deionized water and 200 mL of n-propanol. First adjust the slit of the full back-mixing explosive nucleation reactor to 4. Use a peristaltic pump to simultaneously pump the salt solution and the alkali solution into the total back-mixing explosive nucleation reactor at a speed of 150 ppm, and adjust the voltage to 180 to turn on the colloid mill for stirring. A 3L crystallization vessel was used to terminate the reacted slurry under the fully back-mixed explosive nucleation reactor. After the reaction was completed, the crystallization container was placed in a crystallization heater whose temperature was set at 100° C. for 1 day. After cooling the highly crystallized vessel to room temperature, the product ...

Embodiment 3

[0029]123.8 g of aluminum nitrate nonahydrate and 155.9 g of calcium nitrate hexahydrate were simultaneously dissolved in a mixed solution containing 750 mL of deionized water and 250 mL of acetone. Dissolve 95 g of sodium hydroxide in another mixture of 750 mL of deionized water and 250 mL of acetone. First adjust the slit of the total back-mixing explosive nucleation reactor to 6. Use a peristaltic pump to simultaneously pump the salt solution and the alkali solution into the total back-mixing explosive nucleation reactor at a speed of 100 ppm, and adjust the voltage to 150 to turn on the colloid mill for stirring. A 5L crystallization vessel was used to terminate the reacted slurry under the fully back-mixed explosive nucleation reactor. After the reaction was completed, the crystallization container was placed in a crystallization heater whose temperature was set at 20° C. for 1 day. Then the crystallization container was taken out and cooled to room temperature, the pro...

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Abstract

The present invention provides a preparing method of calcium-aluminium houghite for concrete admixture, belonging to houghite material preparation field. The preparing method includes: resolving a certain proportion calcium salt, aluminum salt and sodium hydroxide grain in organic-water mixed solvent respectively, adopting fully back mixing explosive nucleary reactor to synthesize calcium-aluminium houghite gel, then packing product in a certain crystallization container to crystallization to prepare calcium-aluminium houghite. The diameter size of the forming grain is adjusted by controlling organic-water mixing solution, and controlling gap of fully back mixing explosive nucleary reactor and voltage to obtain calcium-aluminium houghite powder which size between 20 nm-5 mu m and purity is above 99.9%. The preparing method has a simple operation, mildly synthetic condition, and also has a simple forming equipment, easy to operate and better repetitiveness.

Description

technical field [0001] The invention belongs to the technical field of preparation of hydrotalcite materials, and in particular provides a preparation method of calcium aluminum hydrotalcite used as concrete admixture. Background technique [0002] Intercalation materials are a new class of functional materials that have developed rapidly in recent years. The controllability and diversification of its building blocks and structures provides a broad space for its development. It can be used as catalytic materials, separation and adsorption materials, functional auxiliary materials, biomedical materials, etc., and is widely used in many fields of the national economy. fields. Since the 1990s, research institutions and industries at home and abroad have paid more and more attention to it. Anionic intercalation structure materials are an important branch of intercalation structure materials, which are dominated by hydrotalcite compounds. Hydrotalcite compounds include hydrota...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/00C01F7/00C04B14/36
CPCC04B22/10
Inventor 张法智张博文徐赛龙段雪
Owner BEIJING UNIV OF CHEM TECH
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