Method for filtering slurry into filtrate

Abstract

The invention provides a method for filtering slurry into filtrate. The method comprises the following steps: in a filtering device, firstly, forming the slurry into a filter cake layer at low pressure, and then carrying out high-pressure filtering to obtain the filtrate. The method for filtering the slurry into the filtrate is easy in operation and good in safety, through a technical scheme thatlow-pressure filtering is firstly carried out to form the filter cake layer and the formed filter cake is then used for carrying out high-pressure filtering, a penetration filtering problem which is in the presence when an existing traditional technology adopts filter cloth with a high ventilation amount is solved, a filtering process is quick and efficient, and the obtained filtrate is clean filtrate. According to the method provided by the invention, filtering accuracy is less than or equal to 3 mu m, the moisture rate of the filter cake is less than or equal to 17 percent, and the thicknessof the filter cake is greater than or equal to 14mm. In addition, the filtering device is cleaned and preheated, so that the problem in a traditional technology that a filtering effect is affected since crystal is generated in the slurry is effectively avoided, meanwhile, the influence problem that filter cloth is blocked by pipeline residues is solved, and no filtering deviation phenomena are generated.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a method for filtering slurry into filtrate. Background technique [0002] At present, the traditional methods for filtering the reaction slurry in the domestic traditional vanadium chemical process include disc vacuum filter, horizontal filter press, vertical filter press, belt filter and so on. In order to ensure the filtration speed in the traditional filtration method, the air permeability of the filter cloth generally used is too large. Although the filtration speed is improved in this way, because of the large filter holes, there is a problem of penetration of tiny particles, and many current filtration processes are clean filtrates. , because the residues in the pipeline will block the filter cloth and affect the filtration speed. The slow filtration speed and the lack of preheating of the pipeline will cause the temperature of the slurry to drop, and crystals will affect ...

AI Technical Summary

Problems solved by technology

The disadvantage of this scheme is that the method is cumbersome and not easy to operate, and it cannot effectively control the moisture content of the filter cake and the thickness of the filter cake layer.

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