Modern Lead and Zinc Industry in China | SpringerLink
— The lead-zinc ratio in the ore is averagely 1: 2.5. The proved resource quantity of the ore with ≥3.5% grade accounts for 22.4% of the national total resource quantity. The average grade of zinc ore is 3.32%, and mostly 1–7.5%. ... In 1957, the splash condenser of Huludao Zinc Plant was tested successfully, and a multi-hearth furnace …
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