Lining process for cold ramming paste of submerged arc furnace

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 properties. It is much better than traditional carbon brick furnaces in terms of resistance to slag, molten iron, etc., and anti-permeability.

The use of cold ramming integral furnace construction technology has changed traditional carbon brick furnace construction.

The carbon lining of some furnaces was exhausted by oxidation after only a few months of use, and the furnace was forced to shut down for major repairs and rebuilding. Successfully extracted cold ramming paste as the advantages of good plasticity for furnace building materials, and made a reasonable combination of material selection, technological innovation, and ease of construction, which broke through the limitations of traditional carbon brick furnaces and also met the requirements of ferroalloys. , The smelting technology requirements of the yellow phosphorous furnace and other smelting furnaces have fulfilled the requirements of mining and metallurgical enterprises to reduce energy consumption and increase output. It has played a positive role in improving the technical level of the electric furnace device.

The patented technical invention of the cold ramming furnace is to make full use of its own research and development of the process structure of cold ramming seamless integral molding. The invention utilizes the characteristics of cold ramming and paste, which are easy to ram and shape at low temperatures and have the same physical and chemical properties as carbon bricks after baking. As the characteristic of unshaped carbon material with strong plasticity, it completely replaces carbon brick as the overall material for making a smelting furnace body. The structure is shown in Figure 1. Its seamless ramming structural process greatly reduces the technical problems of molten iron leaking to the bottom of the electric furnace and damaging the furnace wall, which prolongs the service life of the electric furnace, eliminates many hidden dangers when building the furnace, and ensures The normal production of electric furnaces has a wide range of applications. In addition to its process technology can be used for the new construction, construction, and technical transformation of ferroalloy and yellow phosphorus electric furnaces, it can also be used for the construction, construction, and technical transformation of various smelting electric furnaces and aluminum electrolytic cells and other submerged smelting furnaces. Through the comprehensive use of different supporting paste technologies, the cold pound paste furnace technology can be widely used in the design and construction of electric furnaces in different regions at home and abroad, increasing economic and social environmental benefits.

At present, there are many companies preparing cold ramming paste for furnace building, mainly using calcined anthracite, graphite, etc. as aggregates, modified asphalt as a 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 the 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 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 formulation of cold mash materials for different furnace types, different construction conditions, and production requirements. For some special cases such as rare earth smelting electric furnaces, specific technical requirements are adopted and formulated to adjust the process parameters. Use cold ramming to reduce the inner diameter of the phosphorous furnace, change the unreasonable furnace production process coefficient, and increase the yellow phosphorus output accordingly. For example, the 3.2MVA phosphorous furnace of the Sanjiang Yellow Phosphorus Plant in Guiyang, about 4.5t before the renovation; 5t after the technical renovation. The six 15MVA phosphorous furnaces of Qianneng Company were successfully modified by the cold pounding process, which increased the output of each furnace from 17-18t to 21.5-22t. The electric power consumption of its electric furnace was 14500kWh/t before the technical reform, and after the technical reform, the power consumption was about 13,800kWh/t. Effectively realize the effect of increasing production and energy saving, and prolong the service life of the furnace body.

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