Equipment and method for separation and washing of fly ash alumina clinker dissolution slurry

Abstract

The invention discloses a device and method for separating and washing fly ash alumina clinker dissolution slurry, the device includes: a transmission device; a filter cloth; a shell with a washing device and a stirring device; a solid-liquid separator, It includes a first gas-liquid separator, a second gas-liquid separator, a vacuum pump and a vacuum disk. The steps include: starting the conveying device, distributing the material from the feed port to the filter cloth, stopping the operation of the conveying device, lowering the housing until it completely covers the filter cloth, and vacuuming for 5 to 10 minutes, maintaining a pressure of -0.02 to -0.06MPa, the filtrate enters the first gas-liquid separator, starts the conveying device again, raises the shell until it leaves the filter cloth, starts the washing device, stirring device and vacuum pump, and the eluent enters the second gas-liquid separator In the process, the solid residue is unloaded from the discharge port, and then distributed to the filter cloth from the feed port again, and the separation and washing of the fly ash alumina clinker dissolution slurry is carried out again by the above method.

Description

technical field [0001] The invention relates to a comprehensive treatment technology of fly ash, in particular to equipment and a method for separating and washing fly ash alumina clinker dissolution slurry. Background technique [0002] There are a large number of high-alumina coal resources in central and western Inner Mongolia and northern Shanxi, which are not only rich in reserves, but also relatively concentrated in distribution. The alumina content in the fly ash produced after combustion is more than 40%, which is a high-quality coal. Bauxite Alternative Resources. When using the sintering method to extract alumina from fly ash, it is necessary to carry out alkali-dissolution treatment on the alumina clinker generated by calcination. During the alkali dissolution process, it is necessary to quickly separate the dissolution slurry to avoid the loss of alumina caused by the secondary reaction of the dissolution slurry. At the same time, it is necessary to wash the se...

AI Technical Summary

Problems solved by technology

Since the settling tank relies on the principle of gravity separation to achieve solid-liquid separation, it is difficult to achieve effective sedimentation separation when the particle size of the solid phase is fine or the specific gravity difference between the solid and liquid is small.

In addition, the sedimentation separation process takes a long time for liquid-solid separation, which leads to a series of problems such as high secondary reaction loss of alumina and many times of washing.

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