Analyze the characteristics of the wet phosphoric acid cleaning process.

First, while emphasizing the production of the main product phosphoric acid, comprehensive utilization of resources is achieved through a \"closed-loop\" system and process optimization； Secondly, the fluorine in phosphate rock can be used to produce fluorine-based chemicals such as NaSiF6 through absorption and related reactions; the sulfuric acid generated by these reactions can be returned to the system for the decomposition of phosphate rock ； Third, phosphogypsum reacts with ammonium bicarbonate to form sulfuric acid an, which is then reacted with potassium chloride; the conversion rate of phosphogypsum can reach over 95%, while that of potassium chloride can reach over 92% ； Fourth, the calcium carbonate produced during the conversion of phosphogypsum can be used as a fine calcium carbonate material after further processing, or it can be purified and then reacted with phosphoric acid to produce calcium phosphate salts, which can be used as additives or catalysts.

First, while emphasizing the production of the main product phosphoric acid, comprehensive utilization of resources is achieved through a \"closed-loop\" system and process optimization； Secondly, the fluorine in phosphate rock can be used to produce fluorine-based chemicals such as NaSiF6 through absorption and related reactions; the sulfuric acid generated by these reactions can be returned to the system for the decomposition of phosphate rock ； Third, phosphogypsum reacts with ammonium bicarbonate to form sulfuric acid an, which is then reacted with potassium chloride; the conversion rate of phosphogypsum can reach over 95%, while that of potassium chloride can reach over 92% ； Fourth, the calcium carbonate produced during the conversion of phosphogypsum can be used as a fine calcium carbonate material after further processing, or it can be purified and then reacted with phosphoric acid to produce calcium phosphate salts, which can be used as additives or catalysts.