Self-pressure grading system for coarsening period of seeded precipitation

A grading system and roughening technology, applied in the purification of aluminate/alumina/aluminum hydroxide, preparation of alkali metal aluminate/alumina/aluminum hydroxide, etc., can solve the waste of energy and equipment without considering the impact , the utilization rate of spare parts in the factory and the increase in personnel consumption, etc., to achieve the effect of saving electricity, reducing the number of flushing, and reducing the utilization rate

Inactive Publication Date: 2010-11-03
HANGZHOU JINJIANG GROUP
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Problems solved by technology

[0004] From this it can be seen that the defects of the above-mentioned prior art are: 1. The periodic variation law of the coarsening and thinning of the decomposition process is not considered, and the finished aluminum hydroxide is all classified by a classifier
2. The influence of gravity on large-grained seeds is not considered. Large-grained seeds often sink to the bottom of the tank due to the gravitational force of the earth, and the top of the tank is mostly seed particles with smaller particle sizes.
Therefore, the use of classifiers in the coarsening period causes waste of energy and equipment, and also increases the utilization rate of spare parts and personnel consumption in the factory

Method used

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  • Self-pressure grading system for coarsening period of seeded precipitation
  • Self-pressure grading system for coarsening period of seeded precipitation
  • Self-pressure grading system for coarsening period of seeded precipitation

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Embodiment Construction

[0014] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0015] According to the experimental data, it can be seen that in the coarsening period of classification, the number of seed crystal particles greater than 45 μm (called large particles) is more than 91%. Connect the root pipe, utilize the liquid level difference (generally 35 meters) of the decomposition end tank 4 to make the slurry self-pressed and go to the flat plate filter 3, such as image 3 as shown ( image 3 The arrows in indicate the whereabouts of the classified large particles). In this way, on the one hand, the submerged pump can be used to lift materials during the coarsening period of at least 3 months, and only the classifier and submerged pump can be u...

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Abstract

The invention discloses a self-pressure grading system for the coarsening period of seeded precipitation. The system comprises a precipitation groove and a filter, wherein the filter is connected with the bottom of the precipitation groove. By utilizing the periodic change rule of seed particles in precipitated slurry and the self-pressure property of large particles in the coarsening period of seeded precipitation, seeds are discharged directly from the bottom of the precipitation groove and are filtered by the flat filter for grading. The system can decrease the utilization rate of a submerged pump and a grader, reduce the flushing times of other pumps to the grader, and save electric energy.

Description

technical field [0001] The invention relates to the field of aluminum hydroxide production, in particular to a self-pressure grading system in the decomposition and coarsening stage of seed crystals. Background technique [0002] The decomposition of sodium aluminate solution refers to the NaAl(OH) that exists in a supersaturated state in semen 4 Decomposition, crystallization of Al(OH) 3 the process of. The decomposition process of alumina produced by the Bayer method generally uses seed crystal decomposition, that is, adding seed crystals to the supersaturated sodium aluminate solution, decomposing it under the condition of cooling down and stirring continuously, and crystallizing Al(OH) 3 , and this process is generally divided into coarsening and refining periods. During the periodical change process, the growth of crystals belongs to group growth. As the decomposition proceeds, the particle size group becomes larger and is more completely graded by the classifier. Med...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/14C01F7/46
Inventor 冯雨田年伟
Owner HANGZHOU JINJIANG GROUP
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