Lead's natural attributes and classification standards

Natural property and status
Lead is a common non-ferrous metal, its annual sales in the fourth place behind aluminum, copper and zinc in colored metals. The chemical symbol of lead is PB (Latin Plumbum), the atomic number is 82, which is the highest number of atoms in all stable chemical elements. The density is 11.34 g / cm 3, the melting point is 327.5 ¡ã C, the boiling point is 1740 ¡ã C. Have strong anti-radioactive penetration performance. Lead is a silver-gray-lustrous heavy metal that is easy to oxidize in the air to generate a layer of led lead or baseted carbonate, so that the lead surface loses gloss and prevent further oxidation. Lead conductivity is quite low, high resistance performance; soft, weak, and strong exhibitivity. Forklift battery
Leads in the crust is often generated from zinc, copper, constitute lead-zinc ore or lead zinc copper mine, with foreign lead, zinc, copper, generally contain gold, silver, bismuth, cadmium, indium, germanium, tin and other metals. Therefore, lead ore needs to be smelted by pre-oriented concentrates.
At present, the world's realization of industrialized lead smelting processes have the former Soviet Oxygen Flash Smelting - Electrothermal Reduction Method (Kiffcet), QSL Lead, Unexpected Oxygen Blowing Smelting Method (ISA and Ausmelt Lead), Carl Lead, blown ventilation, oxygen bottom blowing lead (SKS), etc.
Lead's consumption is concentrated in lead-acid batteries, cable jackets, lead foils and extruded products, lead alloys, pigments and other compounds, gasoline additives, ammunition and other aspects, in which lead consumption in lead-acid storage batteries accounts for total consumption. More than 75% of the amount.
Lead can be completely recovered without any physical and chemical performance loss, and the lead in which the circulatory chain can be entered has been recovered.
China is the world's largest lead producing country and consumption, 2009 refinement reached 3.55 million tons, accounting for 41% in the world's total production; China's lead consumption is 3.33 million tons in 2009, in the world Consumption is 40% in 8225,000 tons.
Lead classification and quality standards

The lead ingot is divided into odding and small ingots, the small ingot is a long trapezoidal shape, and there is a bundle groove at the bottom, and both ends have highlighted ear. The large ingot is trapezoidal, there is a T-shaped bump at the bottom, and there is a grip slot on both sides. The spindle can range from 48kg ¡À 3kg, 42kg ¡À 2kg, 40kg ¡À 2kg, 24kg ¡À 1kg; the single weight of the scale can be: 950 kg ¡À 50kg, 500 kg ¡À 25kg. According to national standard GB / T 469-2005, domestic lead ingots is divided into 5 licenses in chemical components: PB99.994, PB99.990, PB99.985, PB99.970, PB99.940.


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