Based on the characteristic that the mineral is easily-floated but hard-separated and the mineral size is distributed overly differently,after eliminating the effect of copper ions by sodium sulfide,the copper,lead,zinc is floated by compounding depressant and compounding collector one by one.

The strategy of giving priority to the easy is suggested to paper making enterprises in their access to international market, withconcentration on the introduction to major access patterns.

When in Jin dynasty, the Wu′s domain, Yangzhou area, combined with the Central Plains into one, where used to emerge bandits with a historical trend of “easier to stir than to stabilize”, which has an internal relations with “naturalization” of most of Shanyue′s people.