Method for filtering and separating red mud in sintering process

Abstract

The invention discloses a method for filtering and separating red mud in a sintering process, and relates to a method for separating and washing red mud dissolved out from alumina production by the sintering process. A rubber belt filter is adopted to filter the red mud dissolved out in the sintering process; and the method is characterized in that: in the filtering and separating process, after the dissolved-out red mud enters the rubber belt filter, the red mud is subjected to solid-liquid separation first, and filter liquor which is crude solution is subjected to silicon removal; and the red mud separated from the crude solution continuously moves ahead on the filter along with belt filter cloth, and cleaning solution is injected to the red mud after the separation for washing separation. The method can effectively realize quick separation of the red mud dissolved out in the sintering process, reduce secondary reaction loss in a process of dissolving out and separating clinker, and improve the dissolution rate of alumina. Meanwhile, the water quantity for washing the red mud is reduced, the limitation to the sedimentation capacity of the red mud is eliminated, and the concentration of the crude solution after the red mud is separated can be greatly improved, so the production efficiency of the alumina by the sintering process is improved.

Description

technical field [0001] The invention discloses a method for filtering and separating sintering process red mud, and relates to a separation and washing method for sintering process alumina to produce dissolved red mud. technical background [0002] In the process of sintering alumina production, the separation of red mud from clinker dissolution is a key link. At present, most manufacturers adopt the sedimentation tank separation process. Since the settling tank relies on the principle of gravity separation to achieve liquid-solid separation, it is difficult to achieve effective sedimentation separation when the particle size of the solid phase is small, or the specific gravity difference between solid and liquid is small. When crude liquid Al 2 o 3 When the concentration is greater than 130g / l, the sedimentation rate of the red mud in the dissolution slurry will be very slow, and the sedimentation separation cannot achieve effective solid-liquid separation. In addition,...

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Problems solved by technology

Due to the easy denaturation of the red mud dissolved by the sintering method, the high supersaturation of alumina in the eluate, and the low concentration of alumina, the use of a rubber belt filter to filter and separate the red mud usually results in the hardening of the filter cloth, which makes the red mud dissolved Difficult to filter, causing production disruption