Method for inhibiting scales of wet-process phosphoric acid concentration heat exchanger

Abstract

The invention discloses a method for inhibiting scales of a wet-process phosphoric acid concentration heat exchanger. The method comprises the following steps: (1) selecting sodium alkyl benzene sulfonate, or sodium molybdate or amino trimethylene phosphonic acid as a scale inhibitor; (2) mixing, dissolving and curing the scale inhibitor in a preparation tank; and (3) adding the scale inhibitor into an inlet of an axial flow pump by using a plunger pump, allowing the scale inhibitor to enter the phosphoric acid and mixing the scale inhibitor with phosphoric acid solution completely and uniformly to fulfill the aim of inhibiting the scales of the heat exchanger, wherein the temperature for mixing and dissolving the scale inhibitor in the preparation tank is between 40 and 60 DEG C, and a dissolving and curing time is 30 minutes; and an outlet pressure of the plunger pump is 0.6MPa. The method can avoid the problem of difficult conveyance of the scale inhibitor because of high viscosityand large resistance of conveying pipelines, reduces the phenomena of easy blockage of the conveying pipelines and non-uniform mixing of the scale inhibitor and the phosphoric acid, has the advantages of low cost and convenient installation, and is suitable for enterprises which produce wet-process phosphoric acid.

Description

technical field [0001] The invention relates to the production of purified wet-process phosphoric acid, and also relates to a descaling method, and furthermore, relates to a method for inhibiting scale of a wet-process phosphoric acid concentration heat exchanger. Background technique [0002] As we all know, for the scale inhibition of the wet-process phosphoric acid concentration heat exchanger, the viscosity of the scale inhibitor after preparation is relatively large, and the amount added is small. The pipeline resistance of the scale inhibitor is relatively large during the transportation process, and the transportation is difficult. And to achieve the purpose of scale inhibition, the scale inhibitor must be evenly mixed with phosphoric acid to prevent impurities in the acid from scaling in the heat exchanger. At present, scale inhibitors are added at the inlet of the evaporative feed pump at home and abroad. After the scale inhibitors added by this method enter the eva...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for scale inhibition of wet-process phosphoric acid concentration heat exchangers to solve the technical problems of difficulty in transporting scale inhibitors and uneven mixing of scale inhibitors and phosphoric acid

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