Method for separation and utilization of fly ash aluminum-silicon, and tobermorite and silicon oxide obtained through method
A technology for separation of tobermorite and aluminum silicon, which is applied in the direction of silicon oxide, silicon dioxide, calcium/strontium/barium chloride, etc., can solve the problem of low added value of aluminum extraction from fly ash, and achieve the goal of increasing added value Effect
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Embodiment 1
[0059] This example is used to illustrate the method for the separation and utilization of aluminum and silicon in fly ash of the present invention.
[0060] (1) Grind fly ash to 250 mesh, remove iron by magnetic separation, contact with 15% by weight sodium hydroxide solution according to liquid-solid ratio 3:1, react at 110°C for 1 hour, and then separate solid-liquid to obtain sodium silicate desilication liquid and desiliconized fly ash;
[0061] (2) Mix the desiliconized fly ash obtained in step (1) with quicklime and sodium carbonate according to the weight ratio of 1:0.2:1.10 and sinter at 1150°C for 1 hour to obtain clinker. After grinding the clinker to 80 mesh, The adjusting solution is dissolved at 80°C according to the liquid-solid volume ratio of 4:1 to obtain crude sodium aluminate solution and basic calcium silicate. The XRD pattern of basic calcium silicate is shown in figure 2 , Carry out chemical composition analysis to basic calcium silicate, analysis resu...
Embodiment 2
[0066] This example is used to illustrate the method for the separation and utilization of aluminum and silicon in fly ash of the present invention.
[0067] (1) Grind fly ash to 200 mesh, remove iron by magnetic separation, contact with 10% by weight sodium hydroxide solution according to the liquid-solid ratio of 4:1, react at 90°C for 2 hours, and then separate solid-liquid to obtain sodium silicate desilication liquid and desiliconized fly ash;
[0068] (2) Mix the desiliconized fly ash obtained in step (1) with quicklime and sodium carbonate according to the weight ratio of 1:0.25:1.20 and sinter at 950°C for 2 hours to obtain clinker. After the clinker is ground to 50 mesh, The adjusting solution was dissolved at 70°C according to the liquid-solid volume ratio of 3:1 to obtain the crude sodium aluminate solution and basic calcium silicate. The XRD pattern of basic calcium silicate and figure 2 Similar, not listed, the chemical composition analysis of basic calcium sili...
Embodiment 3
[0073] This example is used to illustrate the method for the separation and utilization of aluminum and silicon in fly ash of the present invention.
[0074] (1) Grind the fly ash to 300 mesh, and after removing iron by magnetic separation, contact with 20% by weight sodium hydroxide solution according to the liquid-solid ratio of 5:1, react at 140°C for 0.5h, and then separate the solid and liquid to obtain the sodium silicate Silicon liquid and desiliconized fly ash;
[0075] (2) Mix the desiliconized fly ash obtained in step (1) with quicklime and sodium carbonate at a weight ratio of 1:0.30:1.20 and sinter at 1250°C for 0.5h to obtain clinker, which is ground to 100 mesh, The adjusted solution was dissolved at 90°C according to the liquid-solid volume ratio of 6:1 to obtain crude sodium aluminate solution and basic calcium silicate. The XRD pattern of basic calcium silicate and figure 2 Similar, not listed, the chemical composition analysis of basic calcium silicate is c...
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