Tianjin electrolytic copper plant for which the anode slime containing lead and tin of high using smelt combined process, about 2% Au and 3.5% Ag into the flotation tailings, and later by test, the recovery of tin in form of tin-lead solder , then the recovery of gold and silver, wherein the solder from the electrolytic anode. The metal recovery rates were: PbZ>91%, Sn>88%, and both Au and Ag were 99%, which greatly improved the recovery rate of Au and Ag.
The Zhongyuan Smelter uses a sulphation roasting-cyanide leaching process to perform acid leaching prior to cyanidation leaching, salt leaching to remove cyanide leaching of Cu, Pb, and Zn, followed by cyanidation and leaching of gold. Changsha Nonferrous Metallurgy Design and Research Institute, through the analysis of copper anode mud, it is known that copper anode mud usually contains 20% to 30% of copper, which is mainly caused by entrained copper sulfate electrolyte. Therefore, it is proposed to pretreat with warm water with sulfuric acid. Not only can you leach most of the copper, but you can also leach a part of the crucible to reduce the copper content of the anode mud to 3% to 6%. Fuchunjiang Smelter wants to cancel the gold and silver electrolysis, and tested the process of TBP-n-octanol extraction of gold-oxalic acid to reduce the stripping gold, so that the purity of gold is greatly improved.
Place the meat on special trays, plate paper or film for skin packaging, a three-dimensional packaging effect is formed, which improves the shelf level and achieves the purpose of oxygen insulation, freshness, moisture, poison, rust, corrosion, pollution, etc., which is effective Extended shelf life is convenient for storage and transportation.
The skinned vacuum packaging machine is a new type of product packaging technology. The skinned packaging can extend the shelf life of the product, have a strong three-dimensional view, and is not easy to pack. It can be widely used in hardware tools, auto parts, medical equipment, electrical and electronic components, and toys. , Stationery, knives, tableware and crafts, etc. Especially suitable for packaging of various seafood such as sea cucumber, abalone, lobster, etc.
The skin packaging is formed by vacuum suction according to the shape of the product and pasted on the cardboard (or bubble cloth, etc.). The transparent skin film is heated and softened and then covered on the product.
The vacuum pump of this equipment adopts the BUSCH100 vacuum pump imported from Germany from Puxu Company. The frame is made of stainless steel. The upper cover is made of 6mm thick 304 stainless steel, and the lower cover is made of integral cast aluminum alloy. The air cylinder uses Airtac thin cylinders, the electrical appliances use Siemens or Schneider AC contactors, Delta microcomputer control, Delta interface display adjustment, German Turck non-contact induction switch, Airtac pneumatic components.
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