Method for utilizing alkali lime sintered red mud for directly synthesizing calcium silicate
A sintering method and calcium silicate technology, applied in the direction of alkaline earth metal silicate, silicate, etc., can solve the problems of large red mud stock, heavy pollution, and difficult treatment, and achieve low equipment requirements, simple process, and production efficiency high effect
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Embodiment 1
[0025] S1. Preparation of raw material slurry: Mix soda lime sintered red mud with silicon dioxide and distilled water, and stir to prepare a raw material slurry. The liquid-solid ratio L / S in the raw material slurry is 20:1;
[0026] S2. Preparation of calcium silicate material slurry by hydrothermal synthesis method: place the raw material slurry in a closed reaction kettle, and place it in an oil bath at 180°C for 8h (heat for 8h after the oil bath temperature reaches 180°C), and at the same time During the heating process, the stirring is carried out at a speed of 300 r / min, and the hydrothermal reaction makes tolerite slurry;
[0027] Here, the main purpose of using a closed reaction kettle to contain the raw material slurry is 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 a salt bath heating method or an electric heating method, as long as the uniform heating can be ...
Embodiment 2-10
[0032] Similar to the synthesis step of Example 1, Example 2-10 is by adjusting the calcium-silicon molar ratio and the liquid-solid ratio L / S in step S1 of the synthesis process, the hydrothermal temperature in step S2, the hydrothermal time and stirring speed, The drying temperature and other parameters in step S3 are used to synthesize different calcium silicate materials. The details of the synthesis of different calcium silicate materials in Examples 2-10 are shown in Table 1.
[0033] Table 1 Examples 2-10 for the synthesis of different calcium silicate materials.
[0034]
[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 the molar ratio of silicon to calcium, the liquid-solid ratio, the hydrothermal reaction temperature, the hydrothermal reaction time and the stirring speed during the synthesis process. . Specifically, ...
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