Complex copper-lead ore beneficiation separation method adopting middling returning and regrinding technology

Abstract

The invention relates to a complex copper-lead ore beneficiation separation method adopting a middling returning and regrinding technology, comprising the following steps of: carrying out ore grinding on raw ores, and then carrying out copper roughing; carrying out copper choiceness by adopting flotation on rough concentrates obtained through the copper roughing; and carrying out copper scavenging on tailings obtained through the copper roughing. The complex copper-lead ore beneficiation separation method is characterized in that in the copper-lead separation process of the copper choiceness,middling chosen in a first copper choiceness process is returned to a first copper scavenging process, and the middling chosen in a second copper choiceness process and the middling chosen in a thirdcopper choiceness process are intensively returned to the copper roughing process, therefore, the influence of impurities on grades is prevented, and the purpose of enhancing the grades of the copperconcentrates is achieved; in the copper scavenging process, concentrates subjected to primary choiceness are reground, and ore charges are conveyed to the copper choiceness process to form selective milling after regrinding, thereby not only enhancing the dissociation degree of copper-lead ores but also preventing overgrinding, and enabling the copper concentrates to obtain higher recovery rate.

Description

technical field [0001] The invention relates to the technical field of mineral processing, in particular to the process of beneficiation of complex refractory copper-lead-zinc polymetallic ore, through copper-lead separation middle ore return and regrinding technology, improving the copper-lead separation effect and obtaining qualified copper concentrate. Background technique [0002] With the rapid development of the global market economy, the demand for non-ferrous metals in various countries in the world is increasing day by day, which has accelerated the rapid development of various related industries in the mining industry and the continuous improvement of new technologies for mineral processing. Complex copper-lead-zinc polymetallic ores have complex and changeable ore properties, and the ore properties of copper-lead-zinc minerals are very complex, closely symbiotic, and alternate; lead-zinc minerals are activated by inevitable ions, and it is difficult to separate cop...

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Problems solved by technology

[0003] At the same time, the separation of complex copper-lead-zinc minerals has always been an important research field and technical problem in the mineral processing industry. Copper-lead-zinc paragenetic minerals are difficult to separate, and the mineral processing index is very low; there are quite a few complex copper-lead-zinc minerals that cannot be separated. , only mixed ore can be produced, resources are seriously wasted, and direct economic losses reach tens of billions

The traditional copper-lead mixed flotation and copper-lead separation flotation process not only needs to use toxic chemicals, causing environmental pollution, but also has poor adaptability to raw ore. Generally, it is only suitable for coarse-grained primary ore. It is difficult to adapt to the raw ore with a lot of copper mines, resulting in a large amount of copper resources associated with lead-zinc mines in my country that cannot be recovered due to technical reasons

[0004] In the prior art, due to the close symbiotic relationship between copper minerals and lead-zinc minerals in complex copper-lead-zinc polymetallic sulfide ores, the intercalation particle size is extremely fine, so that it is difficult to dissociate monomers in the grinding process; and copper minerals and lead Minerals have similar buoyancy, which makes it difficult to separate copper and lead; eventually, the grade of copper concentrate in the process of copper-lead separation is low, the mutual content of copper and lead concentrate is too high, and the copper recovery rate is low

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