wanhaorefractory

  The common reasons for the steel outlet blockage are as follows: (1) There is no steel outlet blocked after the last furnace is discharged. During smelting, the molten steel and slag enter the steel outlet, which makes the outlet blocked. (2) After the slag pouring in the last furnace, the remaining steel slag in the tapping port is blocked without all chiseling, which causes the outlet of the next furnace to be blocked. (3) The new outlet is generally small and long, and the plugging is not in place. In the smelting process, the steel and slag are filled into the hole, which causes the plugging. (4) During the tapping, the slag of the lining brick and the agglomerate falling off in the molten pool enters the steel outlet, which may also cause the steel outlet to be blocked. (5) Slag ball is used to prevent slag from steel. Before the next furnace is discharged, the slag ball of the previous furnace is not poked open, which causes the outlet to be blocked. Treatment me

  The continuous casting tundish was originally used for the heat preservation of molten steel, and its main purpose was to distribute and rectify molten steel. With the successful development of technologies such as slow cooling of molten steel, molten steel reheating technology, argon gas sealing technology, gas stirring technology and removal of non-metallic inclusions in molten steel, continuous casting tundish have become the most important part of the final stage of the steel smelting process. The main refining vessel is developing to a large scale. 1 Purification function To produce high-purity clean steel, install porous air-permeable bricks at the bottom of the tundish or embed porous tubular gas distributors between the working layer and permanent layer, or install porous bricks on the slag retaining wall to blow argon to make argon bubbles. Float evenly from the bottom to promote the removal of inclusions. These devices can eliminate the hydrogenation of mol

  At present, there are two main measures to improve the bursting resistance of refractory castables , reasonable drying and heating system and application of explosion-proof additives. Due to the different production conditions in different kilns, it is difficult to formulate a unified and reasonable drying and heating system. Therefore, anti-explosion substances are often added to improve the anti-explosion performance of refractory castables . The new high-strength corrosion-resistant castable has excellent corrosion resistance and good thermal shock resistance, which makes it widely used in the lining of key parts of large kilns. In the production process, the structure, particle size distribution, material and additives were adjusted to improve its anti-cracking performance, but at the same time, some problems were brought, such as too fast setting speed, delayed hardening and instant loss of fluidity, which caused the refractory castable to burst from time to time.

  It is one of the important smelting methods to blow inert gas into molten steel through the upper nozzle of tundish . Therefore, the upper vent of tundish is widely used. Through the optimization of the material combination of the upper vent nozzle, the upper nozzle with the ladle purging plug ring can be made, which has excellent air permeability and resistance to physical and chemical erosion. There are three points to pay attention to the performance of the air vent: excellent air permeability, heat resistance and impact resistance and steel erosion resistance. The domestic steel plants generally adopt dispersion type nozzle, which is made of corundum and chrome corundum. It is noted abroad that the dispersion type and water mouth with straight holes are used, and the material is aluminum carbon material. Based on the domestic and foreign experience and the actual situation of steel mills, the material combination is optimized. The vent ring is made of chromium corun

  Some of the problems that occur during the use of tundish refractory materials are the quality of the material itself, and some are related to the on-site construction and need to be carefully observed and analyzed. (1) Dry material has no strength Before the tundish is put into use, the dry material of the working layer needs to have a certain low temperature strength, which is mainly obtained by vibration and baking. After the dry material is demolded by vibration and baking, there will often be local lack of strength or low strength, which is very easy to cause collapse and affect the production of continuous casting cases. After long-term observation and analysis, the main reasons for the lack of strength or low strength of the dry material are: ① Baking problem:? The tundish baking device used in the steel plant is a gas baking device, which will cause a large number of pipelines to focus after long-term use. The tar or the burner is damaged, causing the par

  The oxidation of ladle slag line brick is mainly carbon oxidation, including gas phase oxidation, liquid phase oxidation, indirect oxidation and the influence of porosity. Gas phase oxidation refers to the direct oxidation of carbon, which occurs when graphite coexists with air (O2), water vapor (H2O) and carbonic acid at high temperature. Liquid phase oxidation refers to the oxidation of carbon caused by iron and manganese oxides in the slag. Generally, with the increase of total iron content in the slag, the damage rate of magnesia carbon furnace lining brick will increase. In this process, with the formation of decarburization layer on the surface of carbon containing products, the slag is easy to penetrate and react, resulting in the loose structure of lining brick and accelerating the damage of products. Indirect oxidation is the reaction between MgO and carbon at high temperature to form decarburized layer, which leads to the deterioration of the

 1. The hanging form of trough anchor brick is simple in structure and masonry, and easy to replace. In order to avoid the high temperature of I-steel hanging on the anchorage brick, the heat insulation layer is not allowed to be laid on the upper surface of the anchorage brick , so the heat dissipation of the furnace top is large. 2. The hanging form of anchorage bricks with staggered teeth and joints has the advantages of good integrity and sealing, and individual bricks will not fall even if they are broken. Its disadvantages are complex brick shape, strict tolerance requirements and difficult masonry. It is not suitable to lay thermal insulation layer on the upper surface of the roof anchor brick of structure. 3. The brick furnace top is anchored and suspended by a stiff hanging type. Each brick of this structure has a hook and a suspender. Because the metal clip hook is outside the masonry, the heat insulation layer can be laid on the surface of the anchoring bri

  At present, some units have adopted furnace manipulators or fully automatic calcium carbide furnaces, but many of them still use manual operations. There will be many security risks in this process. 1: Burns. When the furnace pressure of the stone furnace is too high, the liquid calcium carbide or other debris in the furnace will be sprayed onto the furnace platform during the firing process, which may easily cause burns to the operators; during the process of oxygen blowing from the furnace, if the isolation protection is not in place, it will also cause burns to the operators; In the process of handling calcium carbide from the furnace runner, if the operation is improper or the personal protection is not in place, it may also cause burns to the operators. 2: Fire and explosion. During the baking process, the discharge nozzle leaks, the boiler nozzle circulating water pipe leaks, etc. Contact with calcium carbide will cause burns; during the baking process, there