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In the production process of wet-process phosphoric acid, the vacuum filtration system equipment and pipelines experience varying degrees of scaling and blockage. These scaling substances are mainly composed of KzSiF6, NazSiF6, and CaSO4·2H20. Particularly, phosphate ores with high potassium and sodium content exhibit severe scaling phenomena, which greatly hinder the normal production of wet-process phosphoric acid. The anti-scaling agents, solubilizers, and synergists for wet-process phosphoric acid are synthesized through specific processes, effectively resisting the formation of easily scaling substances during the filtration and delivery processes of wet-process phosphoric acid, especially the nucleation and crystal growth of KzSiF6 and NazSiF6. They can significantly loosen and reduce the adhesion of scaling substances nearby. With a certain amount of addition, they can greatly extend the continuous normal production cycle and have no adverse effects on the wet-process phosphoric acid production process and its subsequent processes, making them a very effective anti-scaling additive.
Key words: Phosphate compound fertilizer auxiliariesphosphoricprocess
During the shutdown cleaning process of the phosphoric acid pipeline, a mixed acid of dilute sulfuric acid and dilute fluorosilicic acid is generally used as the cleaning solution to remove scaling in the system. These cleaning solutions, while cleaning the pipeline and equipment such as graphite heat exchangers, can also cause corrosion to the stainless steel material in the pipeline. The phosphoric acid pipeline corrosion inhibitor V730 is compounded from organic phosphonic acid, polycarboxylic acid sulfonate copolymer, copper-iron corrosion inhibitors, and film-forming substances. It can effectively slow down the corrosion of equipment by sulfuric acid and fluorosilicic acid in the cleaning solution, improving the utilization rate of the equipment.
Key words: Phosphate compound fertilizer auxiliariesacidphosphoricpipeline
