Easy damaged part and common refractory for steelmaking electric arc furnace

The current commonly used arc furnace, furnace wall and bottom furnace, the hot spot is the weak link of electric arc furnace.

Reasons for damage of the refractory at the top of the one is splashes, furnace dust erosion; second is due to the high around the electrode temperature, top temperature difference larger
caused by melt erosion and thermal shock. Commonly used in the refractory with high aluminum brick, magnesia chrome brick, dolomite brick, silica and other and relevant material of refractory pouring material or ramming material, and some also used prefabricated pieces of the roof of the furnace.

Hot parts of furnace wall lining easy erosion, the reason is high temperature, molten steel and slag erosion, charging the impact.Refractory material is mainly used all kinds of basic refractories, the prevailing magnesia carbon brick.

The damage of the bottom is mainly due to chemical erosion and mechanical Chong, commonly used alkaline refractory ramming material or castable lining, the dry vibration material effect is good.

The overall development trend of the steelmaking electric arc furnace is the large-scale, two is the power unceasing enhancement, and three is the additional enhancement smelting measure. The steelmaking arc furnace of new technology: strengthening smelting enriched pulverized coal injection, bottom blowing stirring, eccentric bottom tapping, DC electric arc furnace.

The new technology adopted, both positive and negative influences to the refractory material, overall negative effect on refractory larger, such as ultra high power, oxygen enriched intensified smelting, bottom blowing stirring the refractory material of the more demanding conditions of use. Eccentric bottom tapping and DC arc furnaces are the conditions for the use of refractory material of furnace wall relative improvement, but conditions of use of certain parts of refractory become demanding, especially for DC arc furnace bottom lining. Therefore, the refractory industry must develop new varieties to meet the need of new technology for steelmaking arc furnace.

Correct using method make refractories have anti damage ability

Supporting the development of refractories for the clinker rotary kiln each work with the different mining conditions, targeted to different anti damage of refractory materials, andconsidering the basic matching problem with various working lining life, reduce maintenance times to stop the kiln, each work with lining, the anti damage of independent and phase the purpose of matching cycle. Lining material preheating with good chemical stability, alkali erosion leaf wax stone brick and strong, the pyrophyllite using low alkali and high alkali bricks siliceous raw material, the raw material made of, whether or not to burn the Chengdu firing with anti alkaline strong, but the strength is high, nearly doubled than clay brick life.

The industrial trials in Xinmi Changxing Refractories Co., and recommended for coke oven chamber wall three hot repair methods: flame spraying; ceramic welding using oxygen; theexothermic material (heating material) to repair. The process is: with the help of the principle of common heat generated to form a protective layer on the surface of masonry of refractory material to repair the surface.

Flame gunning method of flame gunning refractory products, powder particles melt in the liquid or gaseous fuel to the flame, and was sent to the surface to be repaired. The masonry is nozzle flame of heating, so using this method without special restrictions on the temperature, but also can be used to refractory powder cheaper to obtain high quality spraying layer. The principle of the ceramic welding method is added to the material of strong oxidant (exothermic material: aluminum, silicon etc.). Wind transport by means of oxygen jet flames, oxidant and refractory powder to the surface to be repaired.

Refractory materials mainly used what place

Refractory material is the basis of materials in the field of high temperature technology. Department of applied very widely. Which is the most widely used in a variety of thermalequipment and high temperature in the container as resistance to high temperature structural material and lining. In the iron and steel metallurgy industry, coke oven is mainly composed of refractory materials. BF and hot blast furnace iron making steelmaking furnace, heating furnace, soaking pit, are absolutely indispensable in accordance with requirements of various refractory material. Not only the liquid steel casting to consume a large amount of refractory material, casting more need some high quality  refractory materials. Refining outside the furnace refractories have superior species would not be able to achieve. The statistical results show that the iron and steel industry is the most need the Department refractory material, accounting for about 60% of the total output of refractory materials. Smelting and processing of non-ferrous metals is also inseparable from therefractory material. High temperature operation Department of building materials industry and other silicate products, such as all the high temperature furnace glass industry, cement industry, ceramic industry and its lining must be made of refractory material to build. Other such as chemical industry, power, machinery manufacturing and other industrial high temperature operations in a variety of baking furnace, sintering furnace, heating furnace, boiler and flue, a chimney, protective layer must be refractory material.

In short, when some structures, apparatus, equipment or containers, in more than 1000 high temperature operation, because there may be a physical, chemical and mechanical effects, the deformation and the softening and melting material, or erosion, erosion, collapse or damage phenomenon, not only can make the operation could not be sustained. The service interruption, affect the production of materials, processing and pollution, affecting the quality of the products; it must adopt the refractory material with resistance to high temperature.