Editor: Lena
At present, most of the three-phase AC fused magnesium furnaces that produce fused magnesia are slender and cylindrical. This electric arc furnace uses an electric arc as a heat source, and its main characteristic is heat concentration. Particularly suitable for smelting fused magnesia. However, the maximum heating temperature of the electric arc furnace is an upper limit, which results in incomplete purification of raw materials and low product purity and density. During the entire heating process, due to the long duration, the pollution caused by it is also serious. These are all unavoidable. The accumulated experience of long-term use of AC electric arc furnaces has provided necessary conditions for the production and development of DC electric arc furnaces.
In the 1980s, DC electric arc furnaces were widely used in industrial production. The DC arc furnace used in the production of fused magnesia has the advantages of stable arc, uniform thermal field in the furnace, and uniform three-phase load of the power grid. However, the conductive anode of the DC electric arc furnace is provided by the refractory material at the bottom of the furnace, and the conductive refractory material is relatively high, it is inconvenient to install and disassemble, and it is not easy to maintain. Based on the above factors and cost constraints, most of the Liaoning Province in China still uses three-phase AC electric arc furnaces. Among the products it puts into production, the best crystalline and highest purity locations are in the periphery of the Three-Center Park Electricity, while the internal content of impurities is relatively high. The purity between the electrodes is relatively high, and the crystalline particles are also large.