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
Active Publication Date: 2015-07-29
CHNA ENERGY INVESTMENT CORP LTD +1
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Abstract
The present invention discloses a method for separation and utilization of fly ash aluminum-silicon. The method comprises: (1) contacting fly ash and an alkaline solution to carry out a pre-desilication reaction, and carrying out solid-liquid separation to obtain a desilication solution and desilication fly ash; (2) mixing the desilication fly ash, quick lime and sodium carbonate, sintering to obtain a clinker, and carrying out dissolution on the clinker to obtain a sodium aluminate crude solution and basic calcium silicate; (3) carrying out desilication, carbonation and calcination on the sodium aluminate crude solution to obtain alumina; and (4) adding the basic calcium silicate to the desilication solution obtained in the step (1), adding lime milk to carry out combined causticization dealkalization, and carrying out solid-liquid separation to obtain the tobermorite and the alkaline solution. The present invention further discloses the tobermorite and the silicon oxide obtained by using the method. With the method of the present invention, the added value of the aluminum extraction of the fly ash is substantially improved.
Application Domain
SilicaCalcium/strontium/barium chlorides +3
Technology Topic
CarbonationSodium carbonate +9
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