Phosphoric acid production equipment and pipeline cleaning scale removal method

Abstract

The invention discloses phosphoric acid production equipment and a pipeline cleaning scale removal method. According to the method, amino tri (methylene phosphonic acid), phosphono carboxylic acid, acrylamide-sodium allylsulfonate copolymers, multipolymers, crylic acid-acrylic ester-sulphonate copolymers and slow-release agents are adopted for preparing a scale inhibitor, the mass percent of the amino tri (methylene phosphonic acid) in the scale inhibitor is 2 percent to 6 percent, the mass percent of the phosphono carboxylic acid is 2 percent to 6 percent, the mass concentration of the acrylamide-sodium allylsulfonate copolymers is 4 percent to 8 percent, the mass concentration of the multipolymers is 4 percent to 8 percent, the mass concentration of the crylic acid-acrylic ester-sulphonate copolymers is 2 percent to 6 percent, and the mass percent of the slow-release agents is 0.01 percent to 0.02 percent; then, after the scale inhibitor is stirred and heated, the scale inhibitor is added into phosphoric acid equipment and a conveying pipeline, so that scale blocks are soaked by the scale inhibitor, and the scale blocks can be cleaned and removed. When the method is adopted, the scale block cleaning time is shortened, the cleaning cost is reduced, the operation efficiency of the device is improved, the configuration of the scale inhibitos is simple, and the use is convenient.

Description

technical field [0001] The invention relates to equipment and pipelines for phosphoric acid production, as well as a descaling method and a scale inhibitor, and more specifically, a method for descaling phosphoric acid production equipment and pipelines. Background technique [0002] It is well known that during the production process of dihydrate wet-process phosphoric acid, potassium, sodium, silicon and harmful impurities in phosphate rock are likely to cause fouling of filtration, concentration equipment and pipelines. The traditional descaling method uses manual cleaning. The scale is hard and difficult to clean, which seriously affects the normal production. Taking a company as an example, the traditional manual cleaning and descaling takes more than 120 hours for each cleaning. [0003] Since the formation of scales has a great relationship with the impurity content of phosphate rock, process indicators, pipeline materials, etc. also have a great impact on scaling,...

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a method for cleaning and descaling phosphoric acid production equipment and pipelines, which can clean and descale equipment and delivery pipelines, and overcome manual cleaning and descaling time consuming flaws