Reduce the amount of smoke and improve the technical level of production operations. Improper handling techniques are the main cause of the increase in smoke volume. Industrial silicon smelting is carried out continuously under the submerged arc state of the electric furnace. In the operation, the arc-closing operation should be performed, and the furnace and the furnace should be timely adjusted to adjust the ratio of the resistance of the charge to the current and voltage.
The choice of flue gas purification equipment. Smelting one ton of industrial silicon produces about 2000-2600 M3 of flue gas, and a large amount of cold air is mixed after burning through the mouth of the furnace. The silicon micropowder stays in the air for a long time, is not easy to settle, has a large specific resistance, the silicon powder is oily, and the viscosity increases with the increase of temperature. Therefore, in order to purify the collected silicon micropowder, it is necessary to carry out a series of treatments such as secondary combustion cooling and pre-dusting of the flue gas.
Purification principle. Fully burned using a spark trap. Collecting unburned carbon particles with sparks eliminates the possibility of spark burning the filter bag, separating some coarse particles in the cyclone to reduce the amount of dust. The temperature is lowered by the heat exchanger to reduce the viscosity of the silicon dust, and then sent to the bag filter by the fan, the silicon dust is filtered in the bag, and the filtered pure gas is emptied.