DEVICE AND PROCESS FOR FLUORINE RECOVERY FROM SMOKE AFTER PHOSPHORUS ABSORPTION BY HYDRATION IN KILN PROCESS FOR PRODUCTION OF PHOSPHORIC ACID

摘要

A device and process for fluorine recovery from smoke after phosphorus absorption by hydration in KPA, wherein the device comprises a first-stage and second-stage fluorine absorption tower, which are both fluidised counter-current washing towers. The device according to the present invention has simple structure, low investment cost, high raw material utilization rate, and good fluorine recovery effects.

主权项

1. A device for fluorine recovery from smoke after phosphorus absorption by hydration in KPA comprising a first-stage and second-stage fluorine absorption tower, wherein the first-stage and second-stage fluorine absorption tower are both fluidised counter-current washing towers, and the first-stage fluorine absorption tower mainly comprises a fluorosilicic acid washing pipe and a fluorosilicic acid separation tank, and the second-stage fluorine absorption tower mainly comprises a second-stage fluorosilicic acid washing pipe and a second-stage fluorosilicic acid separation tank.