Best Good Price Metal Scrap No-Ferrous Metal

The traditional pyrometallurgical lead smelting process has many problems, such as serious environmental pollution, difficult recovery of sulfur in raw materials, high energy consumption and low production efficiency. Since the 1950s, some countries in the world have competed to study the direct lead smelting process to replace the traditional pyrometallurgical lead smelting process. By the 1990s, industrial production or semi-industrial tests have been carried out by KIVCET-CS, QSL, ISA and flash smelting. The common feature of these direct lead smelting methods is that they do not need to undergo separate sintering and roasting treatment, and basically realize self-heating smelting. The flue gas is easy to produce acid, and the degree of environmental pollution is light. From the perspective of development, it is possible to replace the traditional pyrometallurgical lead smelting method.

Lead forms a dense lead oxide film on the surface of the air, a lead carbonate film in the humid air containing carbon dioxide, and a lead sulfate film in sulfuric acid, which play a good protective role. Therefore, lead has excellent corrosion resistance in many media, especially in sulfuric acid. The corrosion rate in the atmosphere of lead industrial area is 0.00043~0.00068mm/a; The corrosion rate in natural seawater is 0.01~0.015mm/a; When the concentration of sulfuric acid is as high as 70% - 80% and the temperature is 50 ℃, lead still has good corrosion resistance.