I. How to choose flotation process?

In flotation process for polymetallic mineral especially for more than two kinds of useful elements, if preferential floats one element and restrain the others, and then activated the remained slurry to float another ore to get the concentrate, this kind of recovery useful mineral in sequence is called “preferential flotation process”. As shown below, the principle of this method is according to different flotability of minerals, generally speaking first separating Cu and then Zn.
But as above showing, if first floating two or more than two kinds of useful elements at the same time to get mixed concentrate. And then separating the mixed concentrate to get different element concentrates, this kind of process is called “mixed flotation process” or “whole flotation process”.
Generally speaking, mixed flotation process is suitable for handling lean but simple raw ore. Choosing mixed flotation process in this situation has the advantages: coarse grinding for raw material so that abandon large quantity of unqualified mineral early, it can reduce the flotation investment and equipment as well as saving drugs and grinding expense at separating process. But the flaws are because mixed mineral surface attached much drugs will result in difficulty for useful minerals separating, so it is hard to get high standard concentrate.
Flotation process brief introduction: Grinding the raw material into powder fineness less than 200mesh about 50% to 70%, 1 roughing flotation 2 or 3 times selected or fine separating, 1 ore 2 times sweep flotation process.
Drugs for reference: frother( 2# oil), Activator(Lime, ZnSo4, Na2So3,etc), Collectors: xanthate, diethyldithiocarbamate,erofloat
Referenced machine: crusher, grinder, flotation machine, dosing machine,agitator

II. Mill solutions to common problems in normal operation

1.Repair mill wear parts
Mill roller body and liner wear during use, once with the gap will increase the wear between the body and liner, coupled with the hot surface of cement particles and the continuous erosion, resulting in the generation of trench , resulting in impact collision occurs between the body and the liner, the liner makes serious cracks or fracture, damage to the machine, especially damage to the gearbox, resulting in serious incidents.
Once such problems occur, the general repair methods are difficult to solve, replace costly. Polymer composites excellent mechanical properties and good plasticity, makes solved the problem. 
2.Mill roller bearing chamber wear repair
Mill roller assembly requirements more stringent bearings, businesses generally use dry ice to cool the bearing on the way the assembly. Once a gap occurs between the bearing and the bearing chamber, it will affect the normal operation of the bearing, resulting in bearing fever, severe burning phenomenon will cause the bearing. Salvo Blue technology is fast, simple and easy to operate features, many cases can be repaired on site.
3.Mill Reducer leakage control
Mill Reducer leakage not only affect the appearance of the machine, and waste oil, repairs and maintenance of equipment to cause a lot of trouble.3223 fast cure materials with rubber repair materials can not shut down, the site of the leak to govern, simple operation, good control effect.