Like any other Ferroalloys products, there is always some impurity stuff in the final product of Ferrosilicon too. This by-product stuff called ”Ferrosilicon slag” and is resulting of melting refractories material with main loaded material in furnace. Refractories must have been coted inside of furnace and pot before starting work in order to protect furnace from hell-heated lava. Temperature in the bottom of Ferrosilicon furnace which usually is settled of liquid lava, raise up to 2500 (°C).
In other words, integrating the refractories material with super-hot liquid, makes some impurity stuff in final lava products which is almost inevitable to be separated all from final product.
Here are some reasons that leads to produce more slags instead main products in a Ferro silicon plant:
However, Slags are mainly containing of its’ most products’ specification with some impurity. Ferrosilicon Slag has probably contains of more Fe, C and Al rather than Si which means we have somehow an off-grade Ferrosilicon.
Although there is some difference in the specifications, it can be sometimes difficult to recognize the main product with slags in appearance. Here are some pictures of Ferrosilicon Slag:
A depot of Ferrosilicon slag
A section shot of Ferrosilicon slag
Unfortunately, in order to being a competitor in the market, earning more benefit and deducting their final producing price, sometimes someone going mix some slag with products at their warehouse. That’s why you should be careful to buy Ferrosilicon from A Reliable Company to make sure will receive your commodity as smooth as possible grade at either top, middle or bottom of the whole bags.
There are some specifications of common Iranian Ferrosilicon Product vs Slag in comparison:
Product: Si: 70-75% Al:2%max C:0.5max S:0.04max P:0.03max
Slag: Si:55-60% Al:2.5-3.5% C:0.5-2% S:0.4% P:0.1%
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