product description
This product is used for carbonization of cast iron and cast iron in various electric furnaces.
It is processed by petroleum coke calcination and purification, and its appearance is round or polygonal. Its characteristics of high carbon, low sulfur, low ash is an ideal carbon-added material and reaction intermediates in metallurgical chemical, machinery, electric power and other industries, and has been widely used. Calcined petroleum coke is a kind of recarburizer. The so-called post-calcined petroleum coke is the petroleum coke after the high temperature of 1300 degrees, the volatiles and sulfur and other impurities in the petroleum coke are removed, and the fixed carbon is increased and stabilized at 98.5%. Left and right, sulfur is about 0.5, but the post-calcined petroleum coke is a petroleum coke that has not been graphitized (the temperature of graphitization is 3000 degrees). Its density is relatively compact and it is not easy to decompose, so the absorption rate will be lower when used. Moreover, the rate of decomposition is also slower, and good graphitization reduces the tendency of the molten iron to shrink. The molten iron is made more pure, and the casting material produced has high performance. Because of the high nitrogen content, most of them are used in ash or cast steel smelting.
Characteristics
Petroleum coke is a by-product of refined crude oil. Residual oil and petroleum asphalt obtained by vacuum distillation or vacuum distillation can be used as raw materials for petroleum coke, and then coke is obtained to obtain raw petroleum coke. The production of raw petroleum coke is less than 5% of the amount of crude oil used. The annual production of petroleum coke in the United States is about 30 million tons. The raw petroleum coke has high impurity content and cannot be directly used as a recarburizer. It must be calcined first.
Raw petroleum coke has spongy, needle-like, granular and fluid states.
Sponge petroleum coke is produced by a delayed coking process. It is usually used as a fuel for calcination because it has a high sulfur and metal content, and can also be used as a raw material for calcining petroleum coke. The calcined sponge coke is mainly used in the aluminum industry and as a recarburizer.
The acicular petroleum coke is obtained by a delayed coking process using a raw material having a high content of aromatic hydrocarbons and a low impurity content. This coke has a needle-like structure that is easily broken, sometimes referred to as graphite coke, and is mainly used for the manufacture of graphite electrodes after calcination.
For casting, cast iron, cast steel, castings will have a carbon requirement, then the carbonizer is to increase the carbon content in the molten iron. For example, in the smelting, the common charge is pig iron, scrap steel, and recycled material. The carbon content of pig iron is high, but the purchase price is higher than that of scrap steel. Therefore, increasing the amount of scrap steel, reducing the amount of pig iron, and adding carbonizer can play a role in reducing the cost of castings.