Preparation and use of xanthogen chloropropyl formate flotation reagents

摘要

Flotation of copper sulfide ores in acid circuits has historically been promoted with ethyl xanthogen ethyl formate. Significantly improved results are achieved with the reaction product of ethyl or isopropyl zanthate with a chlorinated chloroformate. Sodium ethyl or isopropyl zanthate is prepared in an all-liquid system in the presence of excess alcohol. Chlorinated isopropyl chloroformate is prepared by reaction of phosgene and propylene epoxide in the presence of performed product as deluent and activated carbon as catalyst. The chloroformate and xanthate-alcohol mixture are reacted, and the alcohol may be recovered from the aqueous phase.