Crystal filter for wet-process phosphoric acid concentrating device

Abstract

The invention relates to a crystal filter for a wet-process phosphoric acid concentrating device. The crystal filter for the wet-process phosphoric acid concentrating device comprises a barrel, and a cylindrical filter core arranged in the barrel, wherein an annular channel is formed between the cylindrical lateral wall of the filter core and the lateral wall of the barrel; the top part of the filter core forms a taper; the taper top part of the filter core and the lateral wall are provided with filter holes with the apertures of 25-55mm; a liquid outlet led to the outside of the barrel is arranged at the bottom part of the filter core; the barrel is provided with a liquid inlet above the taper top part of the filter core; the bottom wall of the inner cavity of the barrel is tipsily arranged, and a bleed hole is arranged at the bottom part of the barrel. By filtering strong phosphoric acid concentrated in a flash chamber, a graphite pipe can be effectively prevented from being blocked, and the service life of a graphite heat exchanger is prolonged.

Description

technical field [0001] The invention relates to equipment used in a wet-process phosphoric acid concentration device, in particular to a crystallization filter used in a wet-process phosphoric acid concentration device. Background technique [0002] The wet-process phosphoric acid concentration device uses indirect heating, forced circulation and vacuum evaporation to concentrate dilute acid. The clarified dilute acid enters from the outlet pipeline of the circulating acid of the graphite heat exchanger, and flows into the vacuum evaporator together with the circulating acid. The required vacuum degree is provided by a secondary vacuum ejector pump. After being concentrated, the finished phosphoric acid is drawn out from the connecting pipe, and is pumped to the concentrated phosphoric acid storage tank by the concentrated phosphoric acid. The circulating acid goes down the vacuum evaporator and then enters the graphite heat exchanger under the push of the axial flow pump, ...

AI Technical Summary

Problems solved by technology

However, in recent years, due to the decline in the grade of phosphate rock, the deviation of the filtration effect, the decline in acid quality, and the dilute acid with high impurity content entering the concentration system, resulting in serious fouling of the concentration system

Among them, after the graphite tube is blocked by the scaling of large particle size, the current of the circulating pump motor will increase, the outlet pressure will increase, and the graphite tube will be easily damaged, which will reduce the operating cycle of the concentration device.

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