This article studied the effects of different parameters including reaction time

pH

temperature

agitation speed

pH regulator type

dosage on the selective separation

and recovery of manganese from manganese-bearing wastewater using carbon dioxide. Optimum condition was determined by the highest recovery rate of manganese. The results showed that the recovery ratio of manganese was 99.79% with reaction time of 90 min

pH of 6.6

temperature of 45℃

agitation speed of 600 r·min-1

and NaOH concentration of 2 g·L-1. Mn concentration in the effluent was lower than 5 mg·L-1

which met the third level integrated wastewater discharge standard (GB 8978-1996). The precipitate was able to meet the conforming product of manganese carbonate for industrial use standard (HG/T 4203-2011).