CGM Online

 Electrode paste is a relatively simple product in the production of carbon products, but their production links are basically the same from the calcination of raw materials to crushing, screening and the front-end of ingredients. Moreover, it is very important to directly affect the output of finished products, the cost of production, the final quality of products, the scale of capital construction, the investment of capital construction and the cycle of capital construction. 　　In order to obtain good products and control the performance of products, regular carbon production enterprises with scale must first break and screen the calcined carbon raw materials, store the materials separately according to various particle sizes, then design the formula according to the use, variety and specification of the products, and strictly measure the ingredients according to the formula. In order to obtain good products, ensure the good performance of products and ensure the use of products.

 Electrode paste is also called self-baking electrode. It is a kind of semi-finished electrode material made of electric forging coal, residual electrode, etc. as aggregate, and asphalt, tar, etc. as binder. In the process of use, the electrode paste needs to be injected into the submerged arc furnace. When it is heated to about 400 degrees, the electrode paste melts and then completes sintering to become a solid. When it is heated to 800 degrees, the arc combines with the original ore to generate huge heat to complete the ore Smelting. The so-called airtight paste is only for the type of submerged arc furnace. Submerged arc furnace is divided into closed type, semi-closed type and open type. These different types of submerged arc furnaces use electrode pastes. Because of the different furnace types, over time, the electrode pastes applied to closed submerged arc furnaces are called closed electrode pastes, or closed pastes for short; they are used in open or semi-closed arc furnaces.

 The performance of the electrode paste during the sintering process can best explain the quality of the electrode paste. If the sintered electrode has transverse cracks, the next problem is most likely to be hard fracture, which is a very serious accident. The reason is that if the factors of worker operation are excluded, the greatest possibility of hard breakage is the quality of the electrode paste. We once saw an electric forged coal block as big as a fist at a hard-breaking site in a factory in Henan. After testing, the resistance of that batch of electrode paste is above 80. The occurrence of a hard-breaking accident is completely a problem of the quality of the electrode paste. The manufacture of electrode paste is a production activity with simple technology and complex process. Different furnace types have different requirements for the process raw material ratio of electrode paste. As an alloy factory, if the sintered electrode is overheated or Guoruan is found, it should be

 Silico-manganese alloy is a common compound deoxidizer, it is also a reducing agent. High-silicon-manganese-silicon alloy is used for external reduction dephosphorization. CaSi-CaF2-CaO is used as dephosphorization agent. Under the condition of extremely low oxygen potential, the combination of calcium in the dephosphorization agent and phosphorus in the alloy generates Ca3P2, which can make The phosphorus in the alloy is removed, and the alloying elements in the alloy are not lost. The raw materials used in smelting high silicon-manganese silicon alloys are: manganese-rich slag, silica, coke, charcoal, and lime. The basic principle of reductive dephosphorization is to rely on the combination of calcium in the dephosphorizing agent and phosphorus in the alloy to generate Ca3P2 under the condition of extremely low oxygen potential, so that the phosphorus in the alloy can be removed. Adopting process methods: inverted bag method, powder spraying method. Two hot metal ladle A and B are r

 So, is there really an electrode paste without coal tar? have! Our factory has processed 2000 tons of electrode paste without coal tar for a group of well-known companies in the industry. Coal tar is used as a binder in the manufacture of electrode paste. Although coal tar is missing, there is pitch. Of course, this is only based on the special requirements of customers. Generally speaking, the electrode paste requires coal tar. The combination of coal tar + pitch binder can make the electrode paste melt perfectly and then sintered in the submerged arc furnace. If the coal tar is missing It will affect the softening process of the electrode paste. The goose egg-shaped electrode paste, trapezoidal electrode paste, and cylindrical electrode paste produced by our factory are all formulated with coal tar. If it is nickel-iron high-standard airtight paste, the requirements for the formula are more stringent. Therefore, the standard electrode paste needs to be added with coal tar. There are

 The residual electrode is the part that must be replaced with a new anode from the electrolytic cell in order to prevent the steel claws from melting after the pre-baked anode has been used in the electrolytic cell for a period of time. After high-temperature roasting, the residual pole has higher mechanical strength and lower porosity than petroleum coke. Using residual pole as a raw material for the production of carbon products can improve the quality of carbon products to a certain extent. As the "heart" of the calcium carbide furnace, the electrode paste, which is called a carbon functional material, requires sufficient strength and thermal shock resistance. With the advent of the low-carbon era, it is an inevitable trend for large enclosed calcium carbide furnaces to replace small semi-closed calcium carbide furnaces and open calcium carbide furnaces. Therefore, higher requirements for the quality of electrode paste are also put forward. Rongxin Carbon has been special

Application of submerged electric furnace using high-standard closed paste electrode paste (self-baking electrode) in ferronickel production Production and capacity development The main equipment for smelting closed paste nickel pig iron using laterite mines in my country is the electrode paste submerged arc furnace. Next is the blast furnace. In 2012, the output of nickel-containing pig iron physical alloys has reached 5.201 million tons according to private statistics. The output of medium and high nickel pig iron solid alloys with high-standard closed paste nickel pig iron containing more than 4% nickel was 3.95 million tons. The ferroalloy electrode paste submerged thermal equipment produced in my country is undergoing a large-scale transition from a capacity of 6300kva to a capacity of 25000-66000kva. At present, most of the electrode paste electric furnaces with a capacity of 12500-33000kva are used. The profit situation of the recent production of ferronickel products is e

Crushing and screening Laterite ore has low nickel content and uneven lumpiness. The particle size is finer, and there are also large blocks with a particle size of more than 100 millimeters. It is necessary to consider the installation of cone, jaw crusher or counter-roll crusher and screening equipment, so that the high-standard closed paste electric furnace ore and other charge can meet the technical requirements of use. Pre-drying Laterite ore imported from Indonesia and the Philippines usually contains 32-40% moisture. About 20% of the physical water should be dried at 120°C for 2 hours to remove. Use closed paste submerged arc furnace, hot blast stove, rotary furnace hot flue gas to dry laterite, blast furnace or closed submerged arc furnace gas or to strengthen production equipment (7-8% crystalline water, decomposed and removed at 400℃, after half an hour.) Block The powdered red clay is sintered, pelletized, and briquetted into the electrode paste submerged arc furnace, w

The electrode is the only channel for the electric furnace to input electric energy, and it can also be said to be the heart of the electric furnace. Therefore, making the electrode have good working conditions is the key to the successful opening of the furnace. Large-scale submerged arc furnaces generally use self-baking electrodes. Self-baking electrodes use anthracite, pitch, etc. as raw materials to make electrode paste at a certain temperature, and then put the electrode paste into the installed electrode shell and then sinter and coke. . Therefore, to make a reasonable oven system, it is necessary to understand the sintering characteristics of the electrode paste. Sintering process of Rongxin carbon electrode paste self-baking electrode The self-baking electrode sintering process is a process in which the binder decomposes and gradually discharges volatiles as the temperature increases. The sintering of the electrode can be roughly divided into three stages. The first stage

 The height of the electrode paste refers to the height from the upper end of the electrode clip to the top of the electrode paste. If the electrode paste is too high, the coarse and fine particles in the electrode paste are prone to stratification, or the electrode cylinder will be swollen due to too much pressure of the paste column. If the electrode paste column is too low, the pressure of the paste column is too small and the filling is poor, and it is difficult to obtain Dense electrodes. The electrode paste is consumed too quickly. The proper height of the electrode paste column is beneficial to improve the quality of electrode firing and reduce consumption. Electrode paste is the conductive electrode of various submerged electric furnaces, and it is an indispensable product in industrial production. We at Rongxin Carbon have read many domestic and foreign materials, but we have not found any materials that specifically discuss the mechanical strength of electrode pastes. In orde

　　The cold ramming paste overall furnace construction process is different from the traditional furnace building process in that it does not require carbon brick masonry, only micro-expansion cold ramming and cold ramming process are used to seamlessly ram the submerged arc furnace, and the furnace body is punched out inside the furnace body. The frame is laid on the bottom and wall of the furnace with cold ramming paste and rammed into shape. After the furnace body is built, it must go through a rigorous oven stage and use the heat in the furnace from the initial stage of production or even half a year to self-baking, so that the furnace lining is roasted and charred, and finally the cold ramming layer is coked and graphitized, forming a crucible effect. The key to mashing the overall furnace building process. The overall cold ramming furnace construction can improve the lining's bulk density, compressive strength, oxidation resistance, abrasion resistance and other p

 　　At present, there are many companies preparing cold ramming paste for furnace building , mainly using calcined anthracite, graphite, etc. as aggregates, modified asphalt as binder, coal tar, resin, etc. as additives, and various anti-shrinkage materials. It is kneaded with the main raw materials. It is not only used for the overall construction of submerged arc furnaces, but also for partial repair of the furnace lining. However, due to process reasons, there is still layer-to-layer delamination, causing major accidents. 　　At present, through the efforts of many carbon material companies, the technology and process of cold ramming and pasting furnace construction have reached the higher requirements that can meet the construction of any kind of submerged arc furnace. Among them, Guizhou Congrey Carbon Material Co., Ltd. and its subsidiary Guizhou Ali Submerged Arc Furnace Technology Development Co., Ltd. and its R&D center conduct research and adjustments on the formu

 　　The construction quality and service life of smelting furnaces such as ferroalloy and yellow phosphorus have a direct impact on the production efficiency and economic benefit of the production enterprises.Modern submerged arc furnaces generally have the characteristics of closed and continuous operation, and the operation of maintainence and building furnaces is difficult, as well as high labor consumption, time consumption and cost. Therefore, the selection of ideal furnace building materials is crucial to improve the quality of lining and prolong the service life of submerged arc furnaces. 　　In the traditional submerged arc furnace, carbon bricks are basically used as the furnace building material lining the high temperature baking pool. During the furnace building, the gap between the carbon bricks and the carbon bricks is filled by carbon ramming paste. After the completion of the furnace building, the carbon ramming paste between the carbon bricks and the carbon bri