Dc Furnace for Tin Slag Smelting and Recovery
Electric furnace melting in non-ferrous metal smelting is to melt
the material by electric energy through the arc generated by the
electrode and the charge or the high temperature generated by the
resistance of the molten slag. And can control the melt temperature
in the range of 1200 ~ 1600℃ any temperature. Smelting furnace is
mainly used for smelting materials containing a large number of
refractory gangue components, and in areas with sufficient power
resources, it is also used for smelting general ore.
The main advantages of EAF melting are: the bath temperature is
easy to adjust and can reach a higher temperature; Low theoretical
smoke volume; High thermal efficiency, up to 60% ~ 80%; The amount
of slag is small, and the total recovery rate of melted metal is
high.
The main disadvantages of electric furnace smelting are: large
power consumption, high processing cost and higher than that of
reverberatory furnace smelting; The water content of the charge
generally does not exceed 3%; Infrastructure investment is slightly
higher.
Electric furnace is used in the smelting of copper, nickel, zinc,
tin, etc. as well as the heat preservation and dilution of molten
slag.
Application of tin smelting furnace:
Tin concentrate smelting electric furnace is suitable for smelting
low tin concentrate to reduce tin, smelting back slag, smelting
rich slag containing silicon into silicon tin.
The electric furnace uses the arc generated by the electrode and
the charge and the direct use of molten slag as resistance and
strong current method to convert the electric energy into the heat
energy required by the smelting process, and it is easy to reach a
high furnace temperature (1450 ~ 1600℃). As a result, refractory
concentrates can be successfully treated without the need for large
amounts of flux in EAF smelting.
The electric furnace is basically sealed, and a high concentration
of carbon monoxide can be maintained in the furnace, so the charge
with a higher melting point can be melted, and the slag with low
tin content can be obtained. Therefore, electric furnaces are
generally suitable for processing tin concentrates with low iron
content.
In electric furnace smelting, the furnace gas is basically the
carbon monoxide and carbon dioxide produced by the reduction
reaction, and its amount is much less than that of the
reverberatory furnace. (Most of the furnace gas is fuel combustion
flue gas), therefore, the amount of tin and its compounds
volatilized to the furnace gas is less, and the dust collection
equipment used is also smaller.
The production rate of electric furnace smelting is very high, and
the poor tin slag can be obtained after one smelting in electric
furnace.
The disadvantage of electric furnace melting is that it is
difficult to adjust the composition of slag and gas. At high
temperature, the volatilization loss of tin compounds increases
sharply. In addition, the electricity consumption is relatively
large, and the investment of electric furnaces and their auxiliary
equipment is much larger than that of reverberatory furnaces. At
present, it is more suitable for use in areas where electricity is
convenient, or when the concentrate contains high refractory
components and low iron content.
