Lead and zinc is human activity from lead-zinc deposit produced earlier one of the metal. Lead and zinc are widely used in the electrical industry, mechanical industry, military industry, metallurgical industry, chemical industry, light industry and pharmaceutical industry and other fields. In addition, lead metal in the nuclear industry, the oil industry and other departments also have more uses.Lead industrial minerals in the lead-zinc 11 kinds of 6,zinc industrial minerals, galena, sphalerite is the most important.
Lead and zinc used collector:
- 1.Xanthate such agents include the xanthate, xanthate ester, etc.
- 2.Sulfur nitrogen,such as diethyldithiocarbamate, its collecting capacity than xanthate.It galena,chalcopyrite collecting capacity, collecting capacity school weak pyrite selective flotation faster, uses less than xanthate. Sulfide ore coarse raw body stronger collectors than it used to be able to get better than xanthate separation efficiency, copper and lead sulfide ore sorting.
- 3.Black medicine
- The black drug sulfide ore effective collector, the collector than xanthate weak dialkyl dithiophosphate of the same metal ion solubility product than that of the corresponding ion Xanthates large.Black medicine has foamability.
The flotation beneficiation is the most commonly used method of mineral concentration process, economic, convenient, efficient, high-grade ore dressing.Usually lead-zinc beneficiation production line consists of jaw crusher, ball mill, spiral classifier, the mixing tube, flotation machine, dryer and conveyor, spiral washing machines and other equipment. Flotation machine is the important machine in flotation device,the pulp fully inflated stirring, the useful minerals enriched completed flotation. Important step in the process is the selection and operation of the flotation reagent, so as to achieve the purpose of good beneficiation. Compared with other beneficiation methods,the flotation beneficiation economy is reasonable, the effect is very good.
Primary Lead Processing
Primary lead production begins with sintering. Concentrated lead ore is fed into a sintering machine with iron, silica, limestone fluxes, coke, soda ash, pyrite, zinc, caustics or pollution control particulates. The mixture is blasted with hot air to burn off the sulfur and sent to the smelter.
Lead is usually smelted in a blast furnace using the carbon from the sintering machine to provide the heat source. As melting occurs, several layers form in the furnace. The molten lead layer sinks to the bottom of the furnace. A layer of the lightest elements, including arsenic and antimony, floats to the top and is referred to as the "speiss." A "matte" layer also forms from the copper and metal sulfides. Finally, a layer of blast furnace slag, which contains mostly silicates, also forms. The speiss and the matte are usually sold to copper smelters where they are refined for copper processing. The slag is stored and partially recycled, if the metal content is sufficient.
The lead from the blast furnace, called lead bullion, then undergoes the drossing process. The bullion is agitated in kettles then cooled to 700-800 degrees. This process results in molten lead and dross. Dross refers to the lead oxides, copper, antimony and other elements that float to the top of the lead. Dross is usually skimmed off and sent to a dross furnace to recover the non-lead components which are sold to other metal manufactures.
Finally, the molten lead is refined. Pyrometallurgical methods are usually used to remove the remaining non-lead components of the mixture. The non-lead metals are usually sold to other metal processing plants. The refined lead may be made into alloys or directly cast.