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Pre- desiliconizing method from fly ash or slag

A technology of fly ash and pre-desilication, applied in the direction of sustainable waste treatment, solid waste management, climate sustainability, etc., can solve the problems of low pre-desilication rate, high energy consumption, high requirements for desiliconization equipment, etc. Achieve the effect of improving reactivity, reducing roasting temperature, and alleviating the contradiction between supply and demand

Active Publication Date: 2008-11-19
北京世纪地和控股有限公司
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Problems solved by technology

However, the process has a low pre-desilication rate of only 24.3%, and has high requirements for desiliconization equipment (requires a pre-desilication temperature of 120-150°C), and the lye used for desilication in the process of preparing white carbon black from the desilication solution Unfavorable factors such as high energy consumption for recycling, so this method has not been successfully promoted in industry

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  • Pre- desiliconizing method from fly ash or slag
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  • Pre- desiliconizing method from fly ash or slag

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[0031] In order for those skilled in the art to further understand the features and technical contents of the present invention, please refer to the following detailed description and accompanying drawings of the present invention. The accompanying drawings are provided for reference and illustration only, and are not intended to limit the present invention.

[0032] Embodiments of the present invention will be described below in conjunction with the accompanying drawings.

[0033] like figure 1 As shown, the method for pre-desilication of fly ash or slag can be realized through the following steps:

[0034] 101: Activate the fly ash or slag by roasting at 800°C-1000°C, and keep the temperature constant for 30-120 minutes;

[0035] 102: After rapidly cooling the activated fly ash or slag to room temperature, add sodium hydroxide solution. The concentration and amount of sodium hydroxide solution added are: the concentration is 80 g / L to 320 g / L, and every kilogram of pulveriz...

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Abstract

The invention relates to a method for the comprehensive application of fly ash or slag, in particular to a method for the predesilication of the fly ash or the slag. The method mainly comprises the process flows including the baking and the activation of the fly ash or the slag, the formula process of the raw meal of activated the fly ash or the slag and a sodium hydroxide solution and the production of white carbon black. Through adopting a technological line during which the fly ash or the slag are baked and activated at first and then a sodium hydroxide solution is used to extract noncrystalline silicon oxide at a low temperature, the method ensures that the mass ratio of aluminum oxide and silicon oxide of desilicated fly ash reaches to 2.14; therefore, the method breaks a new path to take the fly ash or the slag as a raw material source for extracting metallurgical-grade aluminum oxide, thereby increasing the comprehensive utilization value of the fly ash and the slag.

Description

【Technical field】 [0001] The invention relates to a resource utilization method of fly ash or slag, in particular to a method for pre-desilication of fly ash or slag. 【Background technique】 [0002] In recent years, fly ash or slag has been widely concerned because of its high alumina content and potential as bauxite resources. However, because the content of silica in fly ash is relatively high, which is equivalent to that of alumina, and the sum of the two is close to more than 90%, the ratio of aluminum to silicon is about 1:1, and the aluminum to silicon ratio of bauxite in general alumina industry is The requirement is much higher than 1. The general Bayer method requires Al / Si>8, while the soda lime method treats low-grade bauxite, and its general requirement for bauxite is Al / Si>3 or more, so the fly ash / slag If alumina is to be used as bauxite resource, it is very important to improve its Al / Si ratio by using the current extraction method in the alumina indust...

Claims

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Application Information

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IPC IPC(8): C04B18/08C04B20/02
CPCC04B20/023Y02W30/91C04B18/08C04B18/141
Inventor 张开元
Owner 北京世纪地和控股有限公司
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