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[Chemical Knowledge]：Production and manufacturing method and process of phosphoric acid

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The manufacturing method
of phosphoric acid
1. Introduction

phosphoric acid is an important chemical raw material, widely used in food, medicine, agriculture, metallurgy and other fields. Therefore, it is of great significance to study the manufacturing method of phosphoric acid for improving the output and quality of phosphoric acid, reducing the production cost and promoting the development of related industries. This article will introduce several common phosphoric acid manufacturing methods, and analyze their advantages and disadvantages.

2. the properties and uses of phosphoric acid.

phosphoric acid is an inorganic acid with strong acidity and oxidation, and can be used to prepare various phosphates, phosphides, etc. In addition, phosphoric acid has good thermal stability and chemical stability, and can be used for chemical reactions under high temperature and strong acid environment. In industry, phosphoric acid is mainly used in the production of phosphate fertilizer, phosphate, phosphide, etc., and can also be used in metal surface treatment, food additives, pharmaceutical intermediates and other fields.

3. phosphoric acid manufacturing method

1. wet process phosphoric acid process

wet process phosphoric acid is the phosphate rock, sulfuric acid and water according to a certain proportion of mixed, in the reaction kettle for reaction, the generation of phosphoric acid and gypsum. The process has the advantages of easy availability of raw materials, mild reaction conditions and high product purity, which is the most commonly used phosphoric acid manufacturing method at home and abroad. However, this method also has some disadvantages, such as the gypsum generated by the reaction is difficult to handle, and the equipment is seriously corroded.

2. Thermal phosphoric acid process

The thermal phosphoric acid process is to mix phosphate rock, coke and quartz sand, and then melt in an electric arc furnace at high temperature to generate ferrophosphorus and slag, which then reacts with sulfuric acid to generate phosphoric acid. This method has the advantages of high utilization rate of raw materials, high product purity and no gypsum generation, but the equipment investment is large and the energy consumption is high.

3. hemihydrate phosphoric acid process

hemihydrate phosphoric acid process is to mix phosphate rock, sulfuric acid and water according to a certain proportion, react in the reactor to generate calcium dihydrogen phosphate and gypsum, and then calcium dihydrogen phosphate reacts with phosphoric acid to generate phosphoric acid. This method has the advantages of easy availability of raw materials, mild reaction conditions and high product purity, but compared with the wet-process phosphoric acid process, the amount of gypsum produced is less. Comparative

of different manufacturing methods of

4. The above three phosphoric acid manufacturing methods have their own advantages and disadvantages, and the scope of application is also different. Wet phosphoric acid process is suitable for processing low-grade phosphate rock with high product purity, but equipment corrosion is serious and gypsum processing is difficult. Thermal phosphoric acid process is suitable for processing high-grade phosphate rock with high product purity, but equipment investment is large and energy consumption is high. Semi-aqueous phosphoric acid process is suitable for processing medium-grade phosphate rock with high product purity and less gypsum production. Therefore, when choosing a phosphoric acid manufacturing method, comprehensive consideration should be given to the actual situation.

5. conclusion

phosphoric acid as an important raw material for chemical production has broad application prospects. When choosing a phosphoric acid manufacturing method, comprehensive consideration should be made according to the actual situation, and a suitable process route should be selected to improve the output and quality of phosphoric acid, reduce production costs, and promote the development of related industries.

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