The agitation tank and Keltics static mixer were used to remove arsenic (As) from industrial phosphoric acid by using phosphorus pentasulfide (P2S5). The single factor experiments

orthogonal experiment and response suface methodology were conducted to acquire the optimal process conditions. The results showed that the removal efficiencies of both of the two reactors were higher than 98.8% and the content of As were less than 0.5 mg·kg-1 in the purified phosphoric acid

which met the national standard of China GB 1886.15-2015 for food grade phosphoric acid. As the agitation tank was the reactor

the optimum process conditions were that the actual dosage of dearsenifying agent was 4 times of the theoretical dosage

reaction temperature was 65℃

reaction time was 70 min and the stirring speed was 300 r·min-1. As the Keltics static mixer was the reactor

the optimum process conditions were that the actual dosage of dearsenifying agent was 4 times of the theoretical dosage and the phosphoric acid flow was 0.66 m3·s-1. Under this condition

the disposal phosphoric flow was increased greatly

and the reaction time was only 2.4 s and the amount of phosphoric acid treated per unit of time is 372 times that of the stirred reactor. As Keltics static mixer is used to remove arsenic (As) from industrial phosphoric acid

there are many advantages

such as the shorter technological process

the simpler construction

the continuant operation

etc.

which is hopefully to realize the process intensification of dearsenifying As from phosphoric.