subject: A Brief Introduction To The Flotation Flow [print this page] In recent years, Poland adopts the pointed shrinkage loop re-election process in the lead and zinc sulfide ore ore-milling classification to recycle 0-1mm fractionated part of the galena, to avoid its losses in residue economically and effectively, and improve the condition of flotation circuit conditions.
According to the characteristics of flotation subject, people often complete the check, record, adjustment and stability work of operating parameters by using automatic instrumentation and control devices, the flotation separation process control usually includes flotation process equipment order control, Administration of the amount of feed forward control, the slurry pH value control, pulp potential control, pulp flotation inflatable control, flotation cells level control.
Hongxing Mining Company adopts the stage-wet grinding magnetic separation process, it uses two to one grinding process with two one-stage ball mill against one one-stage ball mill. Grinding and wet magnetic separating the crude concentrate of 25% grade, finally we can get 66.00% grade iron ore concentrate. The cost is lower than 200 yuan per tonne. Beijing Science and Technology University is performing a process test of a certain ultra-poor magnetite. It is found that the crude ores can discard 75.66% qualified gangue after the wet pre-selection. In this way, only one fourth of the ores are going to enter the subsequent operation, which has greatly alleviated the follow-up operation load. Coarse grinding adopts the drum sieve and mill to construct the closed-circuit.
With the rapid development of scientific and technological progress and steel industries, the magnetic separator equipment in China has also rapidly developed and continuously obtained breakthrough, whose application has been further promoted. The first is the application of the permanent magnet of the magnetic separator in weak magnetic field, and a new high-performance neodymium iron boron (Nd-Fe-B) rare earth permanent magnet materials, which has significantly improved the magnetic induction the performance of equipment. Then all kinds of magnetic separator and the strong magnetic separator came out were improved. The high gradient magnetic separator was enhanced to a new level. At present, China's development and production of magnetic separator equipment is a world leader except the superconducting magnetic separator equipment. Superconducting magnetic separator equipment has come out and it has developed from the laboratory-type to semi-industrial type. Now it has entered the industrial application stage.
Mineral separation sequence depends on the floatability of the minerals and symbiotic relationship between ores. Common separation processes include the following:
(1) Selective flotation flow sheet. The process can recover useful minerals according to the difference of mineral floatability. For example, in the mixed flotation of Cu, Pb, Zn, S, we can select Pb and restrict Zn first, and then activate and select Zn. It is suitable for coarse grain and rich ore.
(2) Collective flotation flow sheet. Which is also called mixed flotation process. It first emerges all useful ore together, and then separates them gradually. This is a common polymetallic sulphide ore flotation process and applicable to the raw ore of low grade, mineral density symbiosis, and similar floatability. Under whose effect, useful minerals are disseminated collectively, and we can get mixed concentrate and waste tailings by rough grinding. Compared with Selective flotation flow sheet, the process has the advantages of saving floating grinding equipment, reducing power consumption, saving medicine and infrastructure investment.
(3) Partial mix-flotation. It first floats certain kinds of useful minerals, restrain other minerals, then activate and float restraint minerals. The earlier mixed concentrate has to be floated again, and then we get the qualified concentrate. However, we it shouldnt be adopted when the floatability are not similar.
(4) Isoflotabity flowsheet. When a same mineral contain different floatability parts, we can use such process. Selection is according to floatability. In the flotation of main mineral, we can float the other parts of identical floatability first, and form mixed concentrate, then separate.
When we floating the iron ore, the pulp are generally required to heat up to about 35 degrees to accelerate the collecting agent dissolved and improve the flotation effect. To solve the harmful effects of the fine mud in flotation separation process, sometimes the precipitation-flotation can be adopted. Using the flotation method, the magnetite concentrate can be obtained, the super-high-purity iron ore concentrate can also be obtained, or recycle associated elements from iron ore.
