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Click to add WeChatOre grinding is an essential part of the mineral processing plant. The main purpose is to grind the ore particles into a certain fineness, so that the useful minerals and gangue minerals can be separated to facilitate subsequent separation and extraction. High quality concentrate. Lead-zinc ore is no exception, but due to the different mineral properties of each lead-zinc ore, the grinding process is also different. Currently, the commonly used lead-zinc ore is There are several grinding processes: one-stage grinding process, multi-stage grinding process and concentrate/tailings regrinding process. Let’s learn about these three grinding processes together!
If there is a complex symbiotic relationship between the gangue minerals and metal minerals involved in the loss of lead-zinc ore deposits, and the coarse particles are not The mineral dispersion particle size is evenly embedded, and a one-stage grinding process can be selected.
Take the Huangshaping lead-zinc mine as an example. The mine has a relatively complex ore structure (dense massive, obvious disseminated, brecciated ), using the one-stage grinding and classification process, it can effectively dissociate the effective monomers of minerals such as pyrite, galena, sphalerite, etc. The largest particle size is 0.2mm, the small particle size is 0.1mm, and the raw ore is ground to -0.074mm60.00%~65.00%.
The multi-stage grinding process is mainly suitable for processing complex symbiotic relationships between useful minerals and gangue minerals, or uneven When embedding useful minerals, a multi-stage process can be used, usually a two-stage process is sufficient.
Lead-zinc mine adopts multi-stage grinding process, which can fully realize the monomer dissociation between useful minerals and gangue minerals, and can effectively recover useful minerals. .
Generally, the lead-zinc ore tailings regrinding process or Coarse concentrate regrinding processIt is mainly suitable for lead-zinc sulfide ore dressing plants, and multi-stage grinding is commonly used. For example, the Shuikoushan lead-zinc deposit is a medium-temperature hydrothermal metasomatic deposit type. Most of them are dense and massive ores, only a few of which are fine vein disseminated ores, and some brecciated ores are unevenly embedded. Useful minerals are distributed, and this type of lead-zinc ore mostly adopts the coarse concentrate regrinding process.
In actual work, in order to effectively promote the full monomer dissociation of useful minerals without over-grinding, zinc blende raw ore grinding to the standard of -0.074mm50%~60%, and then complete the tailings cleaning to reach -0.074mm80%. The lead coarse concentrate contains zinc minerals and sulfur in aggregate state. minerals, galena minerals, and then grind them again to reach -0.037mm90% and above, fully dissociating galena, sphalerite, pyrite, etc. .
The above is an introduction to the selection of grinding process for different types of lead and zinc. In the actual lead-zinc ore dressing plant, it should be determined according to the properties of the ore to ensure that each mineral can be fully dissociated to achieve Efficient mineral processing standards to obtain effective economic benefits.
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