Method and device for preparing filter aid in aluminum oxide production

Abstract

The invention discloses a method and a device for preparing a filter aid in alumina production, wherein the method comprises the following steps: grinding blocky lime to obtain lime powder, uniformlymixing the lime powder with a sodium aluminate solution, and carrying out a reaction to obtain tricalcium aluminate hexahydrate. The device comprises crushing equipment, a screw feeder, a preparationtank, a staying tank and a crude liquid tank which are connected in sequence. According to the method for preparing the filter aid in aluminum oxide production provided by the invention, excessive water brought into a reaction system in a process of preparing the filter aid by adopting lime milk in a traditional process can be thoroughly solved, so that the evaporation steam consumption in a production process can be reduced; the device for preparing the filter aid in aluminum oxide production is simple in structure, reasonable in design, low in operation cost and excellent in practical application effect.

Description

technical field [0001] The invention relates to the technical field of alumina preparation, in particular to a method and device for preparing filter aids in alumina production. Background technique [0002] In the prior art, the control filter aid in alumina production is usually prepared by milk of lime and sodium aluminate solution. Specifically, the milk of lime and sodium aluminate solution are reacted in a configuration tank according to a certain ratio, and then reacted in a retention tank. Stay to ensure a certain reaction time, and finally generate tricalcium aluminate hexahydrate, which is a filter aid for controlled filtration in alumina production (TCA for short), and the generated TCA contains six ALO 4 The unit cell composed of tetrahedron forms a ring with a pore radius of 1.47 angstroms, which plays a role in the fine filtration of crude liquid. [0003] However, since TCA in the traditional process is prepared with sodium aluminate solution and milk of lime...

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Problems solved by technology

[0003] However, since TCA in the traditional process is prepared with sodium aluminate solution and milk of lime, the water brought into the alumina system by the milk of lime needs to be evaporated by the evaporator in the subsequent process to achieve water balance, thus causing A substantial increase in production steam consumption, resulting in an increase in production costs

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