Lead and zinc are associated with some polymetallic ores. At present, it is difficult to separate a single type of concentrate from its ore dressing technology. The concentrator can only produce mixed concentrate products.

For example: ① lead-zinc mixed concentrate, some ores are difficult to separate single lead and single zinc concentrate, only mixed lead-zinc concentrate can be selected, such as Shaoguan smelter (Fankou Lead-zinc Mine for mixed concentrate); ② lead antimony mixed concentrate, its mineral composition is brittle antimony lead mine and antimony lead mine, Guangxi Mining Bureau produces lead antimony mixed concentrate; ③ lead tin mixed concentrate, Yunnan Gejiu production. The industrial requirements for the above mixed concentrate have not been uniformly stipulated by the state, and each enterprise has its own quality requirements and pricing standards.