(1) dichromate method: that is, with dichromate inhibition of galena and flotation of copper minerals.
(2) cyanide method: that is, with cyanide inhibition of copper minerals and flotation of lead minerals.
(3) Ferrocyanide method: when the secondary copper mineral content in the ore is very high, the effect of the above two methods are not good enough, at this time, if the lead content in the ore is high, then the use of ferrocyanide (yellow and red blood salt) to inhibit the secondary copper minerals flotation of lead minerals; if the content of lead is much higher than the copper, you should test the following two programs.
(4) Sulfurous acid method (sulfur dioxide method): that is, with sulfur dioxide gas or sulfurous acid treatment of mixed concentrates, so that lead minerals are inhibited and copper minerals are activated. In order to strengthen the inhibition, can then add potassium dichromate or even zinc dithionite, etc., can also be warmed up the slurry (heating flotation method), and finally must be used to lime the slurry pH adjusted to 5-7, and then the flotation of copper minerals.
(5) sodium sulfite, iron sulfate method: that is, using sodium sulfite and iron sulfate as a mixture of inhibitors, and sulfuric acid acid acidification of the slurry, stirring under the conditions of pH = 6-7, inhibition of galena and flotation of copper minerals.
One of the main reasons for the difficulty in separating the copper-lead mixed concentrate is due to the presence of excess chemicals (traps and foaming agents) in the mixed concentrate. Removal of excess chemicals from the slurry and removal of the trapper film from the mineral surface prior to separation of the mixed concentrate can greatly improve the separation of the mixed concentrate.
