Effect of petroleum coke carburizing agent on Steelmaking

With the development of society, the demand for petroleum coke is increasing, and the uses of petroleum coke are also increasing.

In practical production and application, there are certain methods for the influence of carburizing agents on smelting and the use of the same chemical composition, which smelting process to adopt and the proportion of different ingredients. Today, I’d like to introduce to you the influence of carburizing agents on smelting?

The effect of the carburizing agent on smelting mainly has three aspects.

1.Liquid iron carburizing technology can increase graphite crystal nucleus during smelting, especially electric furnace smelting. The addition of silicon carbide in cupola smelting can also increase the feldspar Graphite Nucleus of molten iron and reduce the oxidation of molten iron.

2.Carburization is a measure to prevent or reduce shrinkage tendency. Due to the graphitization expansion of molten iron during solidification, good graphitization will reduce the shrinkage tendency of molten iron.

3.Under the condition of high carbon content, in order to obtain high-strength gray cast iron castings, the melting process adopts the process of scrap steel and carburizing agent, so as to make the molten iron purer and produce castings with high material properties. Clean materials without oil stain shall be used for smelting to avoid electric leakage or excessive scum.

In the past, the iron filings added by some manufacturers during smelting contained oil, which was prone to carbon deposition. The carbon deposition part is on the cold surface of the furnace lining, or even deposited in the thermal insulation layer. Because the furnace lining has not been fully sintered, it infiltrates into the rear of the furnace lining, and co reacts with CO → C + O2 ↑ to generate C, which is deposited in the pores of the furnace lining cold surface or thermal insulation materials. When carbon deposition occurs, it will cause grounding leakage of the furnace body and the spark of the coil.

It can be avoided by using pure materials. In addition, due to the confusion of the source of purchased scrap steel, and even the surface is coated with paint, lime, coal, and other substances, there are many scums, which consume a lot of manpower and material resources in the later slag removal work. How to select a petroleum coke manufacturer is a very important thing for manufacturers purchasing petroleum coke. Here are some precautions and purchase time in the process of purchasing petroleum coke.

Petroleum coke quality: the product is the life of the enterprise. When selecting petroleum coke manufacturers, the first consideration is the quality of coke. There are the following indicators to measure: ① purity refers to the content of sulfur and ash in petroleum coke. High sulfur coke will lead to gas expansion during graphitization, resulting in cracks in carbon products. High ash content hinders the crystallization of carbon structure and affects the service performance of carbon products. ② Crystallinity refers to the structure of coke and the size of Mesophase Spheres. The coke formed by small spheres has a porous structure like a sponge, while the coke formed by large spheres has a compact structure like fiber or needle, and its quality is better than that of a sponge cake. In the quality index, the true density roughly represents this performance, and high true density means good crystallinity. ③ Thermal shock resistance refers to the cracking resistance of coke products under the thermal shock of the sudden rise to high temperature or rapid cooling from high temperature.

Needle coke products have good thermal shock resistance, so they have high application value. The coefficient of thermal expansion represents this performance. The lower the coefficient of thermal expansion, the better the thermal shock resistance. ④ Particle size is the relative content of powder coke and blocks granular coke (available coke) in reaction coke. Powder coke is mostly broken by mechanical action such as extrusion friction in the process of coke removal, storage, and transportation, so its quantity is also a manifestation of mechanical strength. The raw coke can be prevented from being broken after calcining the mature coke. Coke with more granular coke and less powdered coke has a high use-value.

2、 Production conditions: the quality of petroleum coke largely depends on the nature of raw materials and their processing conditions. Therefore, high-quality petroleum coke requires petroleum coke manufacturers to have advanced production equipment and processing technology, which is the premise to ensure the production of high-quality petroleum coke.

3、 High-quality raw materials: the quality and source of raw materials are also an important part of determining the quality of coke.

4、 The standardized production process, strict detection means, and standardized management of petroleum coke manufacturers are not only an important aspect of the sustainable development of petroleum coke manufacturers but also an important standard for your choice. In the past two years, we can find that the carburizing agent materials are also developing with unexpected changes, which can be shown from the smelting process of coal and petroleum coke. The process changes have also improved the quality of carburizing agent products, especially from the changes of some indicators of fixed carbon and sulfur.

At present, there are still certain differences in the sales prices of products of similar specifications in the market, which shows that while reducing the cost of raw materials and the smelting process, the overall sales cost has also been improved. Therefore, there are certain differences in the sales prices of similar products. Therefore, while the production of the carburizing agents is accumulated, the smelting manufacturers also need to improve the smelting production process, which is the only way for the development of carburizing agent manufacturers.