Lead is an important role in people’s daily life and many fields ,especially in the ancient coin forging and metal weapons .And lead is also one of the tax source from the local and central government so that the lead exploration have been valued by the feudal ruler ,which have also brought enormous economic benefits for the lead exploration workers.
Lead (Pb) is one of the oldest metals known to humans. Its widespread occurrence, relatively simple extraction and combination of desirable properties have made it useful to humans since at least 5000 BC. In deposits mined today, lead is usually found in ore which also contains zinc, silver and commonly copper and is extracted as a co-product of these metals. More than half of the lead consumed today comes from recycling, rather than mining.
Lead Flotation machine is applicable for the separation of nonferrous metal and ferrous metals, such as fluorite and talc. The impeller is driven by V-belts, which can bring the centrifugal effect to form negative pressure. While extracting sufficient air to mix with ore pulp, the machine stirs ore pulp and mixes it with chemicals to form mineralized froth. By adjusting the height of the flash board to control the liquid level, the useful froth can be scraped from the loam board. The height of the strobe must be adjusted carefully to keep the stabilization of liquid level and scrape the mineralized froth to the launder. The impellers and stators should be kept at a distance and should be changed when worn. The bearing in the pump should be maintained every three months.
Currently, lead ranks after aluminium, copper and zinc in terms of usage with the largest application being in batteries for transport vehicles and communications. Less important uses include cable sheathing, solder, casting alloys, chemical compounds, ammunition, in ceramics and in glass for TV and computer screens for radiation protection. Its use as a petrol additive has declined significantly with the gradual introduction of lead-free petrol worldwide. New uses for lead could be in large storage batteries used for load-levelling of electrical power and in electric vehicles.
After removing the ore from the mine, it is treated at a concentrating mill. In Concentrating process all waste rock is removed from the Lead.Lead's malleability and ease of smelting accounted for its early use in pipes and lead sheeting for construction purposes. Most lead today is used in batteries for motor vehicles and in communications.The effect of lead crushing mining on the environment has been markedly reduced over the past 20 years as has the use of toxic lead compounds. Lead in petrol is being progressively reduced in many countries and lead compounds in paints have been replaced with non-toxic titanium compounds.
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