High Level Material Ferro Silicon

Silicon-based alloys, including silicon metal and ferro silicon, are important raw materials for the metallurgical, chemical and electronic materials industries. Metallurgical grade silicon-based alloys are produced by carbon-thermal reduction of silicon dioxide (silica) in a submerged arc furnace. Under the conditions of high temperature and strong reduction potential, some impurity oxides in the raw silica and carbonaceous reducing agent are also reduced at the same time, which makes the produced silicon metal and 75 ferrosilicon contain impurity elements such as Al, Ca and P to varying degrees.

1.These impurity elements must be removed by refining to meet the requirements of the iron and steel industry for low-alumina ferro silicon and further purification of the chemical and electronic materials industries to prepare high-purity silicon. The main methods for removing impurity elements in industry are chlorination refining and oxidation refining. The chlorination method has been banned due to serious environmental pollution. At present, the oxidation method has become the main effective means of refining silicon-based alloys in the world. The main principle of the oxidation method is to oxidize the impurity elements of the silicon-based alloy and make them enter the slag phase, so as to achieve the purpose of removal. Thermodynamic equilibrium of slag-gold in refining silicon-based alloys. The slag-gold reaction during refining is as follows: After the refining is completed, the slag-gold reaches equilibrium, and the composition of the slag-gold system depends on the activity and thermodynamic conditions of the corresponding components.

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