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Use of carburizing agent for steelmaking tar

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Use of carburizing agent for steelmaking tar

Date:2017-08-25 Author: Click:

Tar carburizing agent 1. Carburizing technology in molten iron, especially in electric furnace, can increase graphite nucleus. Adding silicon carbide to cupola smelting can also increase the long-acting Graphite Nucleus of molten iron and reduce the oxidation of molten iron.

2. carbon enrichment is the best way to prevent or reduce the tendency of contraction. Due to the expansion of graphitization during solidification, good graphitization can reduce the shrinkage tendency of molten iron.

3. In order to obtain high strength gray cast iron castings with high carbon content, the whole scrap steel and graphitizing carburizing agent were used in the smelting process, which made the molten iron more pure and the casting materials produced had high properties. Steel-making carburizer used in casting, cast iron, steel, castings will have a requirement for carbon, then the carburizer as the name implies is to increase the carbon content in molten iron, for example, in smelting commonly used furnace materials for pig iron, scrap steel, recycle, pig iron carbon content is high, but the purchase price is higher than scrap steel. One section, so increasing the amount of scrap steel, reducing the amount of pig iron, adding carburizer, can play a certain role in reducing the cost of casting.

In the smelting process, due to improper burden or charging and excessive decarbonization and other reasons, sometimes the carbon content in steel does not meet the requirements of the top period, at this time to increase carbon in the molten steel. Commonly used carburizing agents include carburizing pig iron, electrode powder, petroleum coke powder, charcoal powder and coke powder. When converter is used to smelt medium and high carbon steel, Jiaozuo is used as carburizing agent with very little oil. High fixed carbon, low content of ash, volatile matter and impurities such as sulfur, phosphorus and nitrogen, dry, clean and moderate particle size are required for carburizer used in top-blown converter steelmaking.

The carburizing agent is suitable for smelting in induction furnace, but the specific use is different according to the technological requirements.

(1) The carburizer can be added to the lower and middle parts of the furnace according to the proportion or carbon equivalent requirement, and the recovery rate can reach more than 95%.

(2) If the carbon content is insufficient to adjust the carbon content, the slag in the furnace is cleaned first, and then the carburizer is added. Carbon can be dissolved and absorbed by heating up the molten iron, electromagnetic stirring or artificial stirring. The recovery rate can be about 90%. If the low temperature carburizing process is adopted, that is, the burden is only melted part, and the molten iron temperature is low, all the carburizer is used. The liquid is added into the liquid at a time and pressed into the molten iron with a solid charge so that it does not expose the surface of the molten iron. This method can increase carbon content by more than 1%. There are many kinds of raw materials for carburizing agents, and their production processes are also different. It is not on the market to say that the use of graphite powder by pressing molding, this production method needs to add too much binder molding, carbon content generally can not meet the requirements of high-quality graphite carburizer.

Tar carburizing agent

 

Because the pressed graphite powder is solid block and has no porous structure, the absorption rate and absorption rate are not as good as calcined and calcined graphite carburizer.

High quality graphite carburizer generally refers to graphitized graphite carburizer, under high temperature conditions, the arrangement of carbon atoms is graphite micro-morphology, so it is called graphitization. Graphitization can reduce the content of magazines in graphite carburizing agent, increase the carbon content of graphite carburizing agent and reduce the content of sulfur.

1. Scope of application: Graphite carburizer is widely used in iron and steel smelting and precision casting process, especially in the gray iron industry which requires high quality and strict control of sulfur content. It can also be used as adsorbent for heavy metal sewage treatment and raw materials for graphite cathode in aluminum reduction cells.

2. Main analysis and detection methods of graphite carburant:

The content of silicon in graphite carburizing agent determines the hardness of graphite carburant. The particle size of graphite carburizer has great influence on WEDM, but the most important is the particle shape of graphite carburizer. Because the shape change of graphite carburizing agent as free cutting particles has important influence on cutting efficiency and cutting quality in WEDM.


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