Rich slag refining head is hard product which is composed mainly of tin and iron, and some more containing arsenic, the hard head factory output composition shown in Table Hard component of some factories item  Head hard     head     to make     Minutes / % Sn Fe As Sb Pb Cu Zn S Reverberatory furnace slag 1 Electric furnace refining slag 2 Short kiln refining slag 3 35~38 40.0~58.9 71.94 35~38 5.1~26.2 24.63 10~12 0.8~7.1 0.008 0.01~0.03 0.1~0.8 0.0057 0.6~0.8 1.2~4.1 0.10 0.2~1.5 0.06~1.5 0.021 0.4~0.8 0.2~3.9 0.0002 1~5  Â
This type of SF-706 machine have to keep PCB board,the circular blade is moving.It is suitable for Special height for ultra high component can be 70mm.
This type of SF-701machine through adjust the height of track manually and control At 0.01 mm to solve the problem of V-CUT depth. Accept made to order super high components on the PC board such as power supply.The highest for 400mm is also accepted to customize.
The type of SF-705 v notch PCBA Cutting Machine which is suitable for Thickness of the to-be-cut base plate: 0.5-2.0mm, max. length of 300mm PC plate. Then Processing V-PCD plate, aluminum plate and CUT plate, etc.The using way is Controlled by electric pedal or pneumatic pedal, hoe knife plate splitting is completed by the motion of air cylinder.
The type of SF-716 machine is used for visual PCB depanel.
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1 Yunxi Yiye; 2 Duisburg smelting plant in Germany; 3 Peltim smelting plant in Indonesia .
   Some people have used the chlorination method and the amalgam method for the treatment of the hard head. In some factories, the hard head is melted, the water is quenched into granules for oxidative roasting to remove arsenic, and then smelted together with the tin concentrate. At present, the treatment methods commonly used in our factories are: heating and melting methods. In foreign countries, there is also the use of ferrosilicon to treat hard heads. The principle and technical conditions are the same as those of ferrosilicon refining and slag.