Hard handle

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 in .

Hard component of some factories

item Â Head

hard Â Â Â Â head Â Â Â Â to make Â Â Â Â Minutes / %

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

1 Yunxi Yiye; 2 Duisburg smelting plant in Germany; 3 Peltim smelting plant in Indonesia .

Â Â Â 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.

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