As for a zinc concentrate collected from mineral processing of a lead-zinc ore, an experimental study was carried out to reduce the carbon content therein. With soluble starch as the carbon depressant, a concentrate with Zn grade of 48.71%, carbon content of 0.86% and Zn recovery of 90.28% was obtained from a closed-circuit test. Compared with the on-site indicators, both the Zn grade and recovery of concentrate are increased by using this new process, while the carbon content therein is reduced to less than 1%, showing a remarkable carbon-reduction effect.

lead-zinc deposit  /  depressant  /  zinc concentrate  /  starch  /  flotation  /  carbon content reduction