2, alkali leaching with hot alkaline solution of tin dissolution process. Adding an oxidizing agent-containing solution NaOH180 ~ 200g L /, the leaching temperature is controlled at 353 ~ 363K, tin tinplate surface generated stannate (Na2SnO4) dissolved out. Has been widely used in the past saltpeter (NaNO3) oxidant, has gradually been nitrobenzoic acid (NO2C6H4COOH) and other organic oxidant instead. The latter has the advantage of oxidation speed, generating tetravalent tin ions, organic oxidant by oxygen in the air can be regenerated. The tinplate submerged debris into the hole in the tank leaching professional drum recycling iron, tin dissolved in lye in it continuously. To discharge iron recycling Cedar leach solution containing 15g / L while, and then use CO2, NaHCO3, Ca (OH) 2 and H2SO4 and other precipitation tin. Tin-containing precipitate obtained by the reduction of metal tin; also available Na2S leachate purification after producing SnO2 compound; electrolytic deposition method can also be used directly to produce electricity tin. Tinplate treated tin 0.04%. Ordinary board as TV panels generally made of copper, tin and aluminum iron recycling, computer board mobile phone board to extract gold platinum silver and other precious metals. Circuit board: copper up, the circuit board is a thin copper (multilayer more), then the tin iron recovery projects, the solder on the electronic component, at least the most gold (gold plate, only the plating in the surface layer on the line). A printed wiring board composed mainly of three basic components: an insulating substrate, a conductive circuit and installation components. Type of complex printed circuit boards, species diversity, the content of the various components of the composition of the board and the substance is also a great difference. Circuit boards usually contain 30% plastic, 30% and 40% of an inert metal oxide. CHO polymer component mainly composed of plastic, halide and a nitrogen-containing polymer; the main component is an inert oxide silicic acid, alumina, and alkaline oxide; plus minor amounts of other oxides and carbonates. Iron recycling plant | Yantian iron recycling | East in mind renewable resources by Dongguan Chang Ping Tung Kee provide renewable resource recycling. Dongguan Chang Ping Tung Kee renewable resource recycling (www.dongji8.com) strong, credible, in Dongguan, Guangdong scrap recycling industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead the East in mind renewable resources into the brilliant and you work for a better future!