Metal Silicon Distribution Technology

An electric arc furnace is a device that uses the heat generated by an arc for heating. In the process of chemical silicon smelting, there is a close relationship between physical and chemical changes and electrical regulations. The quality of power distribution operation has a significant impact on smelting efficiency. The arc mainly exists at the electrical end, and the cavity is subjected to the impact and thrust of the arc, which opens the material legs and forms a bulb shape. During the smelting process, the control of electrical parameters of the electric furnace is completed by the power distribution work. In general, it is to control the depth of electrode burial. Shallow buried electrodes generally indicate an excess of reducing agent, the formation of a flame near the electrode, loud arc sound, low silicon temperature, low quantity, and high power consumption. Deep buried electrodes, if there is too little reducing agent in the furnace material, the electrode will be in a lower position. Because the resistance of the furnace charge increases with the decrease of carbon in the charge, the increase in resistance leads to a decrease in current load, an increase in electrode consumption, and a decrease in productivity. In production, the depth of electrode burial is determined based on on-site operations. Adjusting the depth of electrode embedding is to change the resistance value of the furnace material, which is the best way to adjust the furnace condition. When the secondary voltage of the electric furnace exceeds a certain value, the electrodes will be damaged, the volatilization loss of silicon will increase, the upper part of the furnace will overheat, and the heat loss will increase. The secondary current is limited by the allowable current density of the electrode and cannot be increased arbitrarily.
The ratio of current to voltage is an important factor in furnace operation. The current to voltage ratio is too small, and the electrode cannot be removed, making it difficult to operate open arc production. The current voltage ratio is too high, the electrode is inserted too deeply into the furnace material, and the production is not very ideal. In production, the best production results can only be achieved by finding the appropriate current to voltage ratio, ensuring stable working current, material balance, and even electrode lifting. Adjusting the working voltage is an important means of adjusting the productivity of the furnace. The working voltage of the furnace depends on two aspects: on the one hand, it is a short network structure that requires high electrical efficiency and appropriate power factor. On the other hand, the furnace condition, including the structure of the furnace body and production operation, is crucial for the resistance value of the working resistance during smelting. It is easy to change, and efforts should be made to stabilize it and approach the optimal value. In general, to ensure normal material surface temperature, increase the voltage. The normal material surface temperature for this package is around 600 ° C. By using raw materials that meet the specifications, the grain size of the furnace material is large, the resistance is small, the branch current is large, and the electrodes are not easy to penetrate.