CGM Online

 Electrode accidents are common accidents in ferroalloys and calcium carbide enterprises smelted by submerged arc furnaces. The cause of electrode accidents is analyzed and judged accurately, and targeted preventive measures can be taken to reduce the occurrence of electrode accidents. However, due to the analysis of electrode accidents, it is supplied by electrode paste. The manufacturer and the electrode paste use the interference of multiple factors. To accurately determine the cause of the electrode accident requires objective evidence recognized by both parties, and the electrode section is a good objective evidence, so the analysis of the electrode section is of great significance. . 1. Electrode paste segregates, resulting in layering of aggregate and powder 1. Section status: There is obvious particle layer segregation on the section of the electrode. According to the size and cross-section of the radiant heat source for electrode baking, there are two situations, one is the ac

 This process mainly has several forms in terms of the layout of process equipment. A flat layout: all the crushing equipment, screening equipment, milling equipment, and storage bins are all on the same plane. It is basically manual operation, the environment is very poor, and the labor intensity is high. This arrangement method is mainly used by some small enterprises and manufacturers with small output. The process is simple and the investment is small. Not suitable for large-scale production requirements and environmental protection requirements. Belongs to extensive production methods. It is characterized by low investment, high labor intensity, high pollution, and low efficiency. In today's social environment where people-oriented, safety and environmental protection are first, small factories should also improve the method of eliminating this kind of medium-crushed ingredients. graphite electrode, cold ramming paste, semi coke, electrode paste, graphite carbon block, smelt m

 The liquid electrode paste flows out from the damaged part of the electrode shell, which is called leakage paste. The reasons are: (1) The welding quality of the electrode shell is not good, and the welding seam is cracked; (2) The copper tile is in partial contact with the electrode shell, and the electrode shell is burned out; (3) The load was not lowered when the electrode was discharged or the electrode case was burned through due to excessive load due to the electrode sliding down beyond the allowable lowering length. Paste leakage usually occurs soon after the electrode is lowered. At this time, the power should be cut off immediately, and the leaking parts should be found. When the leaking hole is not large and the flow is not much, plug the hole with asbestos rope or the like, press the hole in the copper tile, send power and slowly heat up. If the hole is too large to be blocked, repair the iron sheet of the hole after the paste flow is exhausted, and press it into the copper

Build a furnace The main aluminum refractory material is high-alumina brick masonry. Three layers of graphite carbon bricks are built on the bottom of the furnace, and one layer of graphite carbon bricks are built on the walls of the furnace. A layer of electrode paste is knotted at the bottom of the furnace before starting the furnace, with an average thickness of 200mm. Raw material preparation Bauxite Content: AL2O3 55%-90% SIO2 20%-30%. Granularity: 30-120mm Rinse clean Bituminous coal Compared with other alloys in the smelting of silicon-aluminum-iron alloy submerged arc furnace electrode paste smelting, the application of the original agent is the most unique. Among the reducing agents used, bituminous coal accounts for more than 80%. Composition: 15%-25% volatile, less than 20% ash, less than 55% fixed carbon, good slagging performance. Silica In fact, the normal smelting of silicon-aluminum-ferroalloy does not have high requirements for silica. We have used it from 90%

At present, when domestic submerged arc furnaces are used to produce ferrosilicon, manganese and chromium ferroalloys, standard electrode pastes are usually used. With the widespread use of large-capacity submerged arc furnaces and closed electric furnaces, the number of large-scale electric furnaces has continued to increase; and the output of ferroalloys has increased significantly, many silico-manganese alloy submerged arc furnaces are gradually switching to closed electrode pastes. In order to ensure that the self-baking electrode can be sintered early. There are also some silicomanganese alloy manufacturers, which are electric furnace nickel-iron manufacturers. According to the needs of our factory, they usually prefer to choose high-standard sealed electrode paste that is more suitable for them. Among them, the main point is that the high-standard electrode paste is easy to bake, has stable performance and quality, and can ensure the baking quality of the electrode, so as to prev

 Firewood The main purpose of wood baking is to dry the moisture in the furnace and to initially bake the electrodes. Compared with coke and electric baking, wood baking has a larger baking area but a lower temperature, so the time is longer, generally lasting three to five days. Before the firewood is baked, the electrode paste is cushioned with refractory bricks to prevent adhesion. In the early stage of wood baking, the flame height does not exceed the furnace mouth. In the later stage, the electrode is baked with a high fire to make the wood burn evenly and violently. Burnt Before the coke is baked, a circle of flower wall with clay bricks is used to hold the coke around the electrode, and the height is lower than that of the furnace mouth. A layer of 100mm thick coke powder is placed on the bottom of the furnace to prevent oxidation at the bottom of the furnace. During the coking process, always observe the melting of the electrode paste, the height of the electrode paste, the cha