Method for preparing high-quality white carbon black from alumina red mud

Abstract

The invention discloses a method for preparing high-quality white carbon black from alumina red mud. The method comprises the following steps: 1, mixing ingredients; 2, reduction sintering; 3, extracting aluminum; 4, magnetic separation and iron extraction; 5, tailings extracting; and 6, dry characterization; wherein carrying out dry mixing on the red mud, sodium carbonate, fluorite and coke powder for 5-10min according to a ratio of 100: 30-80: 2-10: 5-30, and then adding water to carry out wet mixing for 5-10min; wherein in the second step, feeding an obtained mixture into a high-temperaturefurnace to be sintered, controlling the heating rate to be 30-50 DEG C / min from the low temperature, the temperature to be increased to 750 DEG C for heat preservation for 20-40 min; heating to 1200DEG C at a heating rate of 20-40 DEG C / min, keeping the temperature for 0.5-1 h, and cooling to obtain reduced sintered red mud; according to the method, silicon-containing minerals in the red mud generated in the aluminum oxide production process are used as a silicon source, and the mineral structure is destroyed by utilizing alkaline substances at high temperature, so that the acid solubility of non-silicon dioxide substances is improved, the recovery rate of valuable elements in the non-silicon dioxide substances is greatly improved, and meanwhile, the quality of the produced white carbonblack is greatly improved.

Description

technical field [0001] The invention relates to the technical field of comprehensive utilization of solid waste and preparation of white carbon black, in particular to a method for preparing high-quality white carbon black from alumina red mud. Background technique [0002] White carbon black is the general term for white powdery X-ray amorphous silicic acid and silicate products, mainly referring to precipitated silica, fumed silica and ultrafine silica gel, also including powder synthetic Aluminum silicate and calcium silicate etc. The traditional method of preparing white carbon black is to use sodium silicate, silicon tetrachloride, or ethyl orthosilicate as the silicon source. Except for sodium silicate, the other costs are very high. Wang Keqin invented a method for preparing white carbon black from red mud (CN 102491346 A); Zhang Yihe invented a method for co-producing composite white carbon black with red mud as raw material with multiple flocculants (CN 103922448 B...

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Problems solved by technology

Wang Keqin invented a method for preparing white carbon black from red mud (CN 102491346 A); Zhang Yihe invented a method for co-producing composite white carbon black with red mud as raw material with multiple flocculants (CN 103922448 B). The red mud is directly leached with acid (hydrochloric acid, sulfuric acid, nitric acid or phosphoric acid), because some mineral structures in the red mud are not destroyed, so high-purity amorphous silica white carbon black products cannot be obtained

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