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Method for synthesizing calcium silicate by utilizing soda-lime sintering process red mud alkaline method

A sintering method, calcium silicate technology, applied in the direction of alkaline earth metal silicate, silicate, etc., can solve the problems of large amount of red mud, difficult treatment, heavy pollution, etc., to achieve low equipment requirements, high production efficiency, no Effects of waste and pollutants

Active Publication Date: 2018-04-10
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In order to solve the above-mentioned problems in the prior art, the present invention provides a method for synthesizing calcium silicate by soda lime sintering red mud alkali method, which can effectively utilize the valuable components in soda lime sintering red mud, which is silicic acid The preparation of calcium materials has found new raw materials and methods, and at the same time solved the problems of large stock, large area, heavy pollution and difficult disposal of red mud in the current soda lime sintering method, and realized the high value-added utilization of waste resources

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  • Method for synthesizing calcium silicate by utilizing soda-lime sintering process red mud alkaline method
  • Method for synthesizing calcium silicate by utilizing soda-lime sintering process red mud alkaline method

Examples

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Embodiment 1

[0025] S1. Preparation of raw material slurry: mix soda lime sintering red mud with sodium silicate solution, stir evenly to prepare raw material slurry, wherein, in the mixed raw material slurry, the calcium-silicon molar ratio Ca / Si is 0.83:1, and the raw material The liquid-solid ratio L / S in the slurry is 20:1;

[0026] S2. Preparation of calcium silicate material slurry by hydrothermal synthesis: put the raw material slurry in a closed reaction kettle, and place it in an oil bath at 180°C for 8 hours (heat for 8 hours after the temperature of the oil bath reaches 180°C). Stir at a speed of 300r / min during the heating process, and the hydrothermal reaction makes it generate tobermorite slurry;

[0027] Here, the purpose of using a closed reactor to contain the raw material slurry is mainly to provide a closed reaction condition, and of course other closed measures can also be taken.

[0028] The oil bath heating method can be replaced by salt bath heating or electric heat...

Embodiment 2-10

[0033] Similar to the synthesis steps of Example 1, Example 2-10 is by adjusting the calcium-silicon molar ratio and the liquid-solid ratio L / S in the step S1 of the synthesis process, the hydrothermal temperature, the hydrothermal time and the stirring speed in the step S2, Different calcium silicate materials are synthesized under parameter conditions such as drying temperature in step S3. Examples 2-10 are specifically shown in Table 1 for the synthesis of different calcium silicate materials.

[0034] Synthesis of different calcium silicate materials in Examples 2-10 of Table 1.

[0035]

[0036] It can be seen from Table 1 that calcium silicate products with different crystal forms and physical and chemical properties can be obtained by adjusting the parameters such as silicon-calcium molar ratio, liquid-solid ratio, hydrothermal reaction temperature, hydrothermal reaction time, and stirring speed during the synthesis process. . Specifically, when the silicon-calcium...

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Abstract

The invention discloses a method for synthesizing calcium silicate by utilizing a soda-lime sintering process red mud alkaline method, and belongs to the field of thermal insulation materials. The method comprises the following steps: step 1, preparing a raw material slurry: mixing soda-lime sintering process red mud and a sodium silicate solution according to a ratio of the liquid to the solid of(10-25):1 to prepare the raw material slurry, wherein the molar ratio of calcium to silicon in the prepared raw material slurry is (0.83-1):1; step 2, preparing a calcium silicate material slurry bya hydrothermal synthesis method: performing a reaction on the raw material slurry obtained in the step 1 under stirring at the temperature of 150-200 DEG C for 4-20h under a closed condition to obtaina calcium silicate material slurry; and step 3, synthesizing a calcium silicate powder material: cooling the calcium silicate material slurry obtained in the step 2 at room temperature, performing separation to obtain a solid product and a sodium hydroxide solution, washing the separated solid product with water until the product is neutral, and performing drying to remove moisture, so as to obtain tobermorite or / and xonotlite. The method provided by the invention has the advantages of simple operation, less working procedures, low costs, high preparation efficiency, high-value-added utilization of waste resources, energy conservation and environmental protection.

Description

technical field [0001] The invention belongs to the field of thermal insulation materials, and relates to a method for synthesizing calcium silicate by using a soda lime sintering method and a red mud alkali method. Background technique [0002] Calcium silicate materials are mainly composed of tobermortite, xonotlite and wollastonite. They are widely used because of their special physical and chemical properties. They are mainly used in metallurgy, building materials, textiles, power systems, etc. Insulation of communication equipment and pipelines, as well as thermal insulation of ships and other fields. [0003] Calcium silicate hydrate crystal products include two types: one is tobermorite type, also known as tobermolite (5CaO 6SiO 2 ·5H 2 O), the maximum operating temperature is 650°C, and static hydrothermal synthesis is generally used; the other is xonotlite (6CaO·6SiO 2 ·H 2 O) type, the service temperature can reach 1000 ℃, and generally adopts dynamic hydrother...

Claims

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Application Information

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IPC IPC(8): C01B33/24
Inventor 于海燕潘晓林吴艳毕诗文
Owner NORTHEASTERN UNIV
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