Thermodynamic analysis of waste heat recovery in one-step phosphorous acid production by BEP;

The process driving force and the energy-saving potential were presented in the phosphorous acid production by BEP (Burning Elemental Phosphorus).

With regard to the fouling and plugging problems in the filtrate and the first washing liquid path in the filtering process of wet phosphoric acid production,it proposes ammonium salt as fouling inhibitor.

The mixed acid cooling process is proposed as a result of in-depth analysis of reaction heat removal from the extraction stage of wet phosphoric acid production and the elimination of local supersaturation of calcium sulphate,with an intention to better resolve both problems so as to increase the production intensity of the phosphoric acid reactor and material yield.

The impact of high or low n(SiO 2)/n(F) on the wet phosphoric acid production is analyzed by focusing on the impact on the normal operation of the offgas scrubbing system.

In view of the disadvantages of Chinese pumps for wet-process phosphoric acid production,the JSB alloy for key parts and components,JFZ series horizontal pumps with corrosion and erosion resistant,JLFZ series vertical pumps with corrosion and erosion resistant and JHZ series horizontal axial flow pumps are developed based on the amassed experiences.

For the abnormal phenomena occurred in the wet-process phosphoric acid production process of Shanxi Huashan Chemical Group Co.

Phosphoric acid production was introduced,including production method,development and direction of thermal-process phosphoric acid.

For the excessive P_2O_5 in the offgas discharged from thermal-process phosphoric acid production in a plant,as well as the actual conditions in the plant,the offgas quantity and excess air ratio in the offgas system are calculated,and the operating conditions are analyzed.