high-silicon ferrosilicon
(1) Number of iron tappings. As the smelting process continues, more and more molten iron accumulates in the furnace. A large amount of highly conductive molten iron accumulates in the furnace, which will lift the electrodes and cause operational difficulties. Therefore, at certain intervals, the taphole should be opened to tap out iron, and the large amount of molten iron accumulated in the furnace should be discharged in time to ensure the normal progress of the smelting process. The tapping interval is short and the tapping frequency is large, which is conducive to electrode insertion. However, the number of tapping times is large, the heat loss is large, and the casting loss is also large. Therefore, the appropriate number of tapping times should be determined based on the furnace capacity and smelting grade. Generally speaking, ferrosilicon contains less silicon and has more iron tapping times. For example, when smelting 75% ferrosilicon in a 10,000-30,000 kV·A electric furnace, 4-5 furnaces will be produced in 8 hours. When 180()~9000 kV·A electric furnace is used to smelt 75% ferrosilicon, 3 to 4 furnaces will be produced in 8 hours.
ferrosilicon 75
(2) Preparation work before tapping. Before tapping, all tools for opening and blocking the furnace hole should be prepared and the molten iron ladle should be checked to see if it meets the requirements. Prepare the eye-blocking mud ball. The eye-blocking material is mainly composed of coke powder (electrode paste), water and a small amount of graphite powder mixed into a cone-shaped mud ball that can be combined together. The mud ball is of suitable size.
ferrosilicon powder
(3) Break open the tap hole. The erosion of high-temperature molten iron and the oxidation and ablation of air make the taphole easily damaged. Practice has proved that the service life of the taphole often determines the service life of the furnace body. In order to extend the service life of the furnace body, the taphole should be used and maintained correctly. mouth.
