Flotation is the common copper processing technology, which can be used for sulfide ore and oxide ore. The copper flotation plant usually includes following steps: crushing and screening, stage grinding and flotation, thickening and dewatering, and copper concentrates recovery.
It is suitable for smooth and flat copper ores in coarse and evenly embedding granularity. Which is loosely combined with gangue minerals.
-200 mesh 50%~60% in common, basic monomer dissociation for copper minerals
Ideal flotation indexes can be required through coarse flotation, scvanging and 1-3 concentrating.
This flow is simple and with low cost. It is widely used in small and middle copper processing plant.
It is suitable for single bornite sulfide ore or copper-molybdenum ore.
Through one-stage grinding, the fineness reaches -200 mesh 40%~70%. After flotation, the coarse concentrates are regrinded. The regrinding fineness is according to the monomer dissociation condition.
Through coarse flotation and scvanging, an amount of tailings are removed.
If the grade of raw ore is low with large capacity, ideal economy efficiency can be acquired. Because of coarse concentrats regrinding, the granularity is fine. Copper minerals, gangue minerals and pyrites can be dissociated monomer. The flotation concentrates has high quality.
It is suitable for uneven thickness copper ore. To reach most copper mineral monomer dissociation, the grinding fineness is thinner. Under this condition, two-stage grinding is applied.
Minerals under 200 mesh is about 80% or more. (To dissociate most of the mineral monomers)
After the first stage coarse grinding, part of coarse copper minerals is recovered in flotation. The grade of this part of copper concentrates has high grade, which can enter final concentrating or be as the final concentrates with the comcentrates after flotation.
The two-stage grinding has better effects in grinding efficiency and predicting overgrinding than one-stage fine grinding. Therefore, it is commonly used in middle and large copper processing plant.
|Types of copper ore||Copper grade of sulfide ore≥1||0.4≤copper grade of sulfide or＜1||Copper grade of sulfide ore<0.4|
|Copper grade of mixed ore≥1.5||0.6≤copper grade of mixed ore＜1.5||Copper grade of mixed ore<0.6|
|Copper grade of oxide ore≥3||1≤copper grade of oxide ore＜3||Copper grade of oxide ore<1|
The raw ore was characterized by simple composition. It consisted of metallic minerals (copper pyrite and pyrite) and non-metallic minerals (quartz and chlorite).
One-stage crushing-grinding and classifying-flotation （one-stage roughing, two-stage concentration and three-stage scavenging）.
The raw ore was high-sulfur Cu-S ore in the form of dense lump. Cu, S and Fe were closely associated. With Cu minerals being fine, the ore was of hard beneficiation.