Process for abstracting white carbon black from fly ash or slag
A technology of white carbon black and fly ash, which is applied in the field of resource utilization of fly ash or slag, can solve the problems of restricting industrialization and promotion, and achieve the effect of reducing energy consumption
Active Publication Date: 2011-05-25
北京世纪地和控股有限公司
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Problems solved by technology
[0005] In recent years, most of the domestic and foreign research results on the extraction of useful resources of silica from fly ash or slag have only theoretical significance. In terms of material consumption, environmental protection and operability, there are certain defects, which limit its industrialization promotion
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[0053] 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.
[0054] Embodiments of the present invention will be described below in conjunction with the accompanying drawings.
[0055] Such as figure 1 As shown, when extracting silica from fly ash or slag, it can be achieved through the following steps:
[0056] 101: Grind the slag to 200-250 mesh, and perform magnetic separation on the dry fly ash or slag with a dry magnetic separator, the magnetic field strength is 1000-1300 Oersted, and the mass percentage of iron oxide in the obtained iron concentrate is about 45%; after demagnetization by demagnetization equipment, and then magnetic separation by first-level magnetic separat...
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Abstract
The invention relates to a method for comprehensive utilization of pulverized coal ash or furnace cinder, particularly to a method for extracting white carbon black from pulverized coal ash or furnace cinder. The method comprises the steps of screening fine iron sands from the pulverized coal ash or furnace cinder, separating floating beads through floatation, pre-desiliconizing, producing white carbon black, producing aluminum oxide, and producing cement from waste residues. The inventive method improves the extraction yield, the energy consumption, the material consumption, the environmental friendliness and the operability in the white carbon black extraction process from the pulverized coal ash or furnace cinder, so as to pave a new way for extracting white carbon black form the pulverized coal ash or furnace cinder. At the same time, during the white carbon black extraction process, the method can be used for continuous and gradual extraction fine iron sand, floating beads and aluminum oxide as well as combined production of cement, so as to realize the comprehensive utilization of the pulverized coal ash or furnace cinder.
Description
【Technical field】 [0001] The invention relates to a resource utilization method of fly ash or slag, in particular to a method for extracting white carbon black from fly ash or slag. 【Background technique】 [0002] White carbon black is hydrated silicon dioxide, its chemical formula is SiO 2 ·nH 2 O, it is widely used in various fields such as rubber, plastics, pesticides, paints, pharmaceuticals, papermaking, and daily chemicals. There are mainly two kinds of current processes for the production of white carbon black at home and abroad that have been industrialized, one is the precipitation method using water glass as the raw material, and the other is the gas phase method using silicon tetrachloride as the raw material. The silica industry at home and abroad has been continuously researching and developing, and has made great achievements in the fields of production and application. In recent years, due to the development of domestic rubber shoes and tire industries, the...
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IPC IPC(8): C01B33/12B09B3/00
Inventor 张开元
Owner 北京世纪地和控股有限公司