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dear friends, we have a problem in the recovery of lead in flotation plant. our feed consists of oxide minerals, and we have a lot of froth in our cells especially in the rougher. the froth is poor, that means its density is low, and recovery is low most of the time. we recover solphide minerals at 9.5 pH and in next stages we increase pH up to 11.5 to recover oxide minerals. this procedure increased our recovery from 50 to 65-70, however it still is low. we use pax and pex as well as na2s, na2sio3, and mibc. the feed grade is about 3 percent. I would be grateful if you share your experiences and suggestions with us.