Process Introduction:
Lead-zinc ore divides into sulfide lead zinc ore and oxide ore, lead-zinc mining process common are heavy-floating, magnetic-floating, heavy-magnetic-floating, and so on.
Lead zinc flotation process is the most widely used in separating sulfide ore , to separate zinc and plumbum, and sometimes for separating sulfide iron and other minerals.
flotation gold concentrate and gravity tailings.
Lead and zinc are extremely close in nature, especially in primary deposits, and often coexist. Most of the lead-zinc minerals are sulfides and sulfates, and galena and sphalerite are the primary Pb-Zn ores.
1. Crushing & Screening: The crushing operation mostly adopts a two-stage closed-circuit crushing and screening process. The raw ore is sent to the jaw crusher through the feeder for coarse crushing, the coarsely crushed material is fed into the vibrating screen through the belt conveyor for screening, and the ore particles with qualified size enter the grinding stage. The unqualified materials are conveyed into the crusher by another belt conveyor for the second crushing.
2. Grinding: Because of economic considerations, small beneficiation plants often adopt a simple grinding process to facilitate operation and management. In order to obtain better economic and technical effects, large-scale beneficiation plants usually conduct multiple scheme comparisons to determine the grinding process.
3. Flotation separation:
Mixed flotation separation
Process advantages: The lead zinc flotation process performs two mixed flotation of lead and zinc under weak alkaline conditions, and separates lead and zinc under weak acid conditions. The process of mixing lead and zinc twice can discard the tailings at one time and reduce metal loss. In the lead-zinc processing plant, the destination of the coarse concentrate and the location of the separation ore return can be flexibly configured to adapt to changes in the grade of the original ore.
Floatable for lead and zinc, mixed floatation separation of sulfide lead zinc ore
Process advantages: Floatable lead and zinc eliminate the forced suppression of easily floatable minerals by priority flotation, and avoid the forced activation of difficult floated zinc minerals by mixed flotation, thereby reducing the consumption of reagents and the subsequent separation of residual reagents Impact. In the lead-zinc processing plant, the commonly used equipment is a mechanically agitated flotation machine.
4. Concentrate and dewatering: The lead-zinc concentrate after flotation contains a certain amount of water, which needs to be concentrated and precipitated in the thickener. The discharged ore sludge is pumped to the filter press through the slurry, and the solid and liquid are separated through the filter medium, and finally the concentrate is obtained.
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