CGM Online

 1. Calcining. Both petroleum coke and pitch coke need to be calcined, and the calcining temperature should reach 1350. C, to fully remove the volatile matter contained in the carbonaceous raw materials, and improve the true density, mechanical strength, and conductivity of the coke. 2. Crushing, screening and batching. The calcined carbonaceous raw material is crushed and sieved into aggregate particles of specified size, part of the coke is ground into fine powder, and then weighed according to the formula to form a dry mixture of various particles. 3. Kneading. Under the heating state, the quantitative dry mixture of various particles and the quantitative binder are stirred and mixed and kneaded to form a plastic paste. 4. Forming. Under the action of external pressure or high-frequency vibration, the paste is pressed into a green electrode with a certain shape and higher density. 5. Roasting. Put the green electrode in a special roasting furnace, and use metallurgical coke powder t

 Nickel-iron electrode paste has always been regarded as a high-end product in the electrode paste market. For a long time, the formula of nickel-iron electrode paste has been a mystery. At present, there are only a few electrode paste factories that can produce high-standard sealed electrode pastes that meet the needs of ferronickel production. The formula of the nickel-iron high-standard airtight paste is the same as that of the ordinary national standard electrode paste, and the raw material ratio is different. The terminal price of the electrode paste processed by our factory for a trading company to one of the largest alloy plants in Asia in Jiangsu is close to 4,000 yuan/ton. The price of ordinary electrode paste is only between 3000-3500. The raw materials of nickel-iron smelted electrode paste are indeed a little higher than the cost of ordinary electrode paste. Regarding the amount of electrode paste, our factory's high-standard sealed paste reaches 8-10kg/ton of nickel-ir

 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

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

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

Requirements for the use of electrode paste The process method of producing ferroalloy by electric furnace is the most important process technology. In my country, the number of alloys produced by submerged arc furnaces in electric furnace equipment exceeds 80% of the total output of ferroalloys. Submerged arc furnace is the main equipment furnace type. Submerged arc furnace is also called submerged arc reduction electric furnace. The process technology for the production of ferroalloys uses electric energy as the main heat source, uses carbonaceous reductant to reduce ore, and produces deoxidizers and alloying agents required for steel production. It is the main method for producing ferroalloys. The high temperature and thermal energy required by the ferroalloys produced are usually converted by sending electrical energy into the electric furnace through self-baking electrodes. The self-baking electrode is an indispensable central link in submerged arc furnace equipment, and is the

　　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