Because of the mixed concentrate's incompleted dereagent of production process in concentration plant, the content of zinc in copper concentrate and the copper in zinc concentrate is high and the recovery of zinc is lower.

The technologies that treating the two different kinds of ores separately and producing mixed concentrate directly lower the cost of production 619.

The trial researches are conducted separately with coarse-grain flotation without grinding and fine-grain flotation after grinding for crude titaniferous concentrate with TiO2 grade of about 33 percent.

Based of the situation that the tungsten,tin and iron grade of a rough concentrate from shaking table was not high and it was difficult to separate,the united process of magnetic-flotation-gravity separation was used and the comprehensive reclaim of each valuable metal in the rough concentrate has been accomplished effectively.

In this paper,a rough titanium concentrate in Yunnan was taken as the research sample to increase its titanium content and to decrease its content of calcium,magnesium,silicon,aluminum and other impurities.