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Preparation method of retarder for concrete and equipment adopted by preparation method

A technology of retarder and concrete, applied in the preparation of carboxylate, organic chemistry, etc., can solve the problems of high cost of raw materials, low oxidation efficiency, large consumption of precious metal catalysts, etc., and achieve shortened production time, high conversion rate, easy to use control effect

Inactive Publication Date: 2012-08-22
辽宁岩砂晶建材有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing heterogeneous catalytic oxidation method still has the characteristics of large consumption of noble metal catalyst, low oxidation efficiency and high cost of raw materials.

Method used

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  • Preparation method of retarder for concrete and equipment adopted by preparation method
  • Preparation method of retarder for concrete and equipment adopted by preparation method
  • Preparation method of retarder for concrete and equipment adopted by preparation method

Examples

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preparation example Construction

[0038] The equipment used for the preparation method of retarder for concrete includes:

[0039] a. Atmospheric pressure oxidation kettle A and its supporting system;

[0040] ——Air uniform distribution and solubilization equipment can be installed in the main kettle;

[0041] b. Roots blower;

[0042] c. Pressurized oxygen oxidation kettle B and its supporting system;

[0043] ——The main body of the kettle is a pressure kettle with a design pressure of 0.4~0.6MPa;

[0044] d. Oxygen generator system;

[0045] e. Precious metal catalytic oxygen oxidation kettle C and its supporting system;

[0046] ——Air uniform distribution and solubilization equipment can be installed in the main kettle;

[0047] f. Automatic dripping of liquid alkali and automatic detection of PH instrument system;

[0048] g. Filtration and recovery of precious metal catalyst equipment system.

[0049] The equipment used in the above-mentioned concrete retarder preparation method comprises a blower ...

Embodiment 1

[0060]Take 1000kg of straw sugar solution and add 30kg of hydrogen peroxide and 20kg of sodium persulfate. At a temperature of 60 degrees, pass through purified air for oxidation reaction. React for 2 hours. Then add 20 kg of sodium hypochlorite to the reaction system. Inject oxygen, and drop liquid caustic soda at the same time, maintain the system PH=7~8, react for 1h, add composite type precious metal palladium bismuth carbon catalyst 1.5kg to the reaction system, at the temperature of 60 degrees, continue to feed oxygen, and continue to drop Add lye (NaOH solution with a concentration of 40%), maintain the system pH=8-8.5, react for 1.5 hours, filter and recover the catalyst, the catalyst can be reused more than 100 times, and cool the oxidation solution to 40 degrees to obtain straw production liquid concrete retarder. It can be used or sold directly, or it can be made into a powder product through high-tower spraying.

Embodiment 2

[0062] Take 1000kg of straw sugar solution and add 20kg of hydrogen peroxide and 30kg of sodium persulfate. At a temperature of 60 degrees, pass through purified air for oxidation reaction. React for 2 hours. Then add 30 kg of sodium hypochlorite to the reaction system. Enter oxygen, and dropwise liquid caustic soda (concentration is the NaOH solution of 40%) simultaneously, maintain system PH=7~8, react 1h, add compound type precious metal palladium bismuth carbon catalyst 1kg to reaction system, under the temperature of 60 degree, Continue to feed oxygen, and continue to drop lye (NaOH solution with a concentration of 40%) to maintain the system pH=8~8.5, react for 1.5h, filter and recover the catalyst, the catalyst can be reused more than 100 times, and the oxidation solution is cooled to 40 degrees, that is, a liquid concrete retarder made from straw. It can be used or sold directly, or it can be made into a powder product through high-tower spraying.

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Abstract

The invention belongs to the field of production of building admixtures and particularly relates to a preparation method of a retarder for concrete and equipment adopted by the preparation method. The preparation method comprises the following steps of: (1), taking straw sugar solution, adding a chemical oxidant A and a chemical oxidant B and introducing purified air for oxidation reaction; (2) adding a chemical oxidant C into a reaction system, introducing oxygen, simultaneously adding liquid caustic soda dropwise and maintaining the PH value of the system to be equal to 7-8; (3) adding a precious metal catalyst into the reaction system, continuously introducing oxygen and continuously adding liquid caustic soda dropwise and maintaining the PH value of the system to be equal to 8-8.5; and cooling oxidation liquid to obtain the retarder for the target product concrete. The adopted equipment comprises a fan (1), a first oxidation kettle (2), a second oxidation kettle (3), a third oxidation kettle (4) and an oxygen making machine (5). The preparation method and the equipment adopted by the preparation method have the advantages of low consumption of the precious metal catalyst, high oxidation efficiency, low cost of raw materials and easiness in operation and control.

Description

technical field [0001] The invention belongs to the field of building admixture production, and in particular relates to a method for preparing a retarder for concrete and equipment used therein. Background technique [0002] Adding a certain amount of sodium gluconate to cement can increase the plasticity and strength of concrete, and has a retarding effect, that is, delaying the initial and final setting time of concrete. At present, the production methods of sodium gluconate mainly include four methods: biological fermentation method, homogeneous chemical oxidation method, electrolytic oxidation method and heterogeneous catalytic oxidation method. These four methods are currently being extensively studied in China. In industrial production, heterogeneous catalytic oxidation and biological fermentation are widely used. Among them, the heterogeneous catalytic oxidation method has the advantages of simple process, mild reaction conditions (various gas-liquid-solid three-ph...

Claims

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Application Information

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IPC IPC(8): C04B24/10C07C59/105C07C51/41C04B103/30
Inventor 黄海滨黄海忠高亮
Owner 辽宁岩砂晶建材有限公司