graphitized petroleum coke gpc pricelist
Graphitized petroleum coke material introduction
Graphitized petroleum coke: Graphitized petroleum coke is a by-product of refining crude oil. Residual oil and petroleum pitch obtained by crude oil distillation under normal pressure or vacuum distillation can be used as raw materials for the manufacture of graphitized petroleum coke. After coking, graphitized petroleum coke can be obtained. petroleum coke. The output of raw graphitized petroleum coke is less than 5% of the crude oil used. Raw graphitized petroleum coke contains high impurity content and cannot be directly used as graphitized petroleum coke. It must be calcined first. The calcination of graphitized petroleum coke is to remove sulfur, moisture, and volatile matter. Calcining raw graphitized petroleum coke at 1200~1350°C can make it into substantially pure carbon. However, its sulfur content and nitrogen content still cannot fully meet the current production requirements of high-quality cast iron products. This requires high-quality graphitized petroleum cokegraphitized petroleum coke, which requires lower sulfur and nitrogen content under higher temperature conditions. It also makes the arrangement of carbon atoms show the microscopic morphology of graphite. It is more conducive to the improvement of the quality of cast iron molten iron. And this process of high temperature treatment is called graphitization (as shown in the figure below).
The role of graphitized petroleum coke:
Graphitized petroleum coke, as one of the main sources of graphite main elements in molten iron, is not only to supplement the right amount of carbon. Other effects are often overlooked. In fact, adding graphitized petroleum coke is not simply “increasing C”, but an important measure to increase the graphitization ability of its cast iron products to achieve better matrix structure and mechanical properties. Not all graphitized petroleum coke can achieve this effect. The production of qualified graphitized petroleum coke must undergo rigorous selection of materials, and then undergo high-temperature graphitization. The process not only reduces impurities such as sulfur, gases (nitrogen, hydrogen, oxygen), ash, volatiles, and moisture, but also improves its purity and For graphitization, carbon atoms can change from the original disordered arrangement to an orderly arrangement, and most of the carbon atoms can become a very good driving force for graphitization. The carbon atoms can be quickly melted in the molten iron, and when the molten iron is solidified, it is adsorbed on the nucleation core produced by the nucleation and grows into graphite under the action of a strong driving force when the molten iron is solidified. If the selected graphitized petroleum coke has not undergone high-temperature graphitization treatment, the graphitization driving ability of carbon atoms will be greatly reduced, and the graphitization ability will be weakened. Even if the same carbon content can be achieved, the quality of the product is completely different. Therefore, graphitized petroleum coke products that have undergone high-temperature graphitization treatment and graphite electrode fragments manufactured at high temperatures are currently very suitable for the production of high-quality cast iron products requiring graphitized petroleum coke additives. It not only meets the requirements of product “C increase”, but also provides a good source of power for the production of cast iron products.
How to use graphitized petroleum coke:
1. The process of adding graphitized petroleum coke to the furnace
1) Feeding sequence for cold furnace conditions-add in the method of “scrap steel + ferromanganese + graphitized petroleum coke + scrap steel + recycle material + iron filings + pig iron + ferrosilicon”;
2) The feeding sequence of the hot furnace-there is about 300kg of molten iron left in the bottom of the furnace, which is added according to the method of “scrap + ferromanganese + graphitized petroleum coke + scrap + recharge + iron filings + pig iron + ferrosilicon”;
3) If the scrap is briquetted from leftovers, it may not be practical to add it directly to the bottom of the furnace at the beginning. Therefore, according to the actual situation of the factory, it is added according to the method of “recycled material + ferromanganese + graphitized petroleum coke + scrap + recycled material + ferrosilicon”;
2. The use process of graphitized petroleum coke when fine-tuning
After the molten iron is melted, in the case of insufficient carbon content in the molten iron, it is necessary to fine-tune the carbon increase to meet the process requirements. At this time, it is generally hoped that the graphitized petroleum coke can quickly achieve the effect of increasing carbon, so as to avoid affecting the metallurgical quality of the molten iron due to the excessively long treatment time. At this time, the instant graphitized petroleum coke should be added to the surface of the molten iron after being melted, and the iron can be tapped in 1 to 2 minutes after proper stirring.
Graphitized petroleum coke
①The graphitized petroleum coke should avoid direct contact with the furnace bottom and lining materials to prevent the graphitized petroleum coke from corroding the furnace lining;
②The graphitized petroleum coke should be avoided as much as possible with iron filings to prevent the graphitized petroleum coke from agglomerating with other materials and affecting the absorption of the graphitized petroleum coke;
③If the total scrap steel production process, the amount of graphitized petroleum coke added is too large, it is not advisable to add all of it, and it should be added gradually in layers.
graphitized petroleum coke gpc pricelist: