Analysis of the difference between graphitization carburant and semi-graphitization carburant!

Analysis of the difference between graphitization carburant and semi-graphitization carburant!

In the process of steelmaking or ironmaking, due to product performance, raw material ratio, smelting time, holding time, overheating time and other factors, the carbon content in steel (iron) liquid can not reach the expected theoretical value. In order to make up for the missing carbon content in the smelting process, the addition of carbon-containing substances called carburant. With the higher and higher requirements for steel grades, the requirements for carburant are more and more strict. In order to avoid polluting the liquid steel, the higher the fixed carbon content, the better,while the ash, volatile, nitrogen, sulfur and other harmful impurities content is lower, the better.

What is graphitization? When carbon containing substances reach a certain high temperature, the arrangement of carbon atoms is in the micro form of graphite, so it is called graphitization. Petroleum coke products begin graphitization at more than 1700 ℃, which can reduce the content of impurities in carburant, increase the carbon content of carburant and reduce the sulfur content.

Graphitization carburant, also known as high-temperature graphitization carburant, is a graphitization carburant prepared by high-temperature graphitization treatment with petroleum coke as raw material for carburizing in iron and steel smelting and casting industry. With high carbon, low sulfur, low nitrogen, less harmful impurities, high absorption rate of excellent characteristics, is a new type of steel industry to improve the process, improve the quality of molten steel, widely used in smelting low nitrogen steel, steel cord, high strength bead wire and other steel grades. At the same time, it is also widely used in casting, brake pads, friction materials and other fields. It is especially suitable for electric furnace melting to produce castings with high added value. When casting is produced, the amount of scrap can be greatly increased, the amount of pig iron can be reduced or not used, and the absorption rate is above 90%.

Semi-graphitization carburant, also known as medium temperature graphitization carburant, is the insulating layer in the process of high temperature graphitization of graphitization furnace (Acheson). The calcination temperature is in the range of 1700-2700 ℃. It has the characteristics of high fixed carbon, fast dissolution rate, high absorption rate, moderate sulfur content and high cost performance.

Both physical and chemical indexes:

 Both production process:

Both Price:

 Through the above differences, it is not difficult to see that both are the products of graphite chemical process, and the graphitization carburant has better indicators and better absorption effect. Semi-graphitization carburant is often used as carburant in foundry, and the price is cheaper than graphitization carburant. The biggest difference between the two is the sulfur content, due to the influence of factors such as calcination temperature and graphitization time in the graphitization furnace, the sulfur content of the semi-graphitization carburant is higher than the graphitization carburant, which is the biggest difference between the them!

There are also differences in color. The color of graphitization carburant is relatively dark, and you can even easily draw lines on white paper, while the color of semi-graphitization carburant is lighter, and can not draw a very deep line, so this is also a very important factor to distinguish them.

At the same time, in terms of price, because the absorption effect of semi-graphitization carburant is better than other carburant and the price has advantages, the price is nearly 1000 yuan/ton lower than that of graphitization carburant, which is another factor to distinguish semi-graphitization carburant and graphitization carburant.

With the more and more extensive production of graphite electrodes, negative electrode materials and carbon graphite products in China, graphitization has become a very key technical link in its industrial production process. Since Acheson invented the graphitization furnace (called Acheson furnace) in 1895, the structure of the graphitization furnace has also made great progress. At present, Acheson furnace has DC furnace and AC furnace, In addition to Acheson furnace, there are also internal series graphitization furnace, continuous graphitization furnace, etc., contact us to know more carburant news.