Calcined Petroleum Coke

Calcined petroleum coke uses in the metallurgical field
Calcined petroleum coke is widely used in the metallurgical field, mainly for the production of aluminum electrolysis, silicon, ferromanganese and other metal products. In aluminum electrolysis production, calcined petroleum coke as an electrode material has extremely high electrical conductivity, corrosion resistance and high temperature resistance, which can effectively reduce the energy consumption of the electrolytic cell and reduce oxidation costs; in the production of silicon and ferromanganese, it participates in the preparation process as a reducing agent to improve the efficiency and quality of the entire production process.
 

Calcined petroleum coke uses in the manufacturing field
Calcined petroleum coke is widely used in the manufacturing field, such as the manufacture of building materials such as carbon felt, artificial stone, patterned bricks, and the manufacture of high-energy density materials such as graphite electrodes, carbon materials, and carbon fibers. Among them, graphite electrodes are an indispensable and important material in the modern power and energy industries. The electrical conductivity and high-temperature stability of calcined petroleum coke make it one of the ideal materials for the manufacture of graphite electrodes.

Calcined petroleum coke uses in the chemical industry
Calcined petroleum coke is widely used in the chemical industry and can be used as a photocatalyst, adsorbent, catalyst in water treatment, gas separation, chemical reactions and other fields. Calcined petroleum coke can also be used as an aerator for hydrogen and natural gas, and is used in petrochemicals, chemical fibers, catalysts and other fields.

To Remove the Volatile Matter of Petroleum Coke
Complicated physical and chemical changes appear in the process of calcining petroleum coke. When it is under 200C, petroleum coke gets heated and water comes out, which is mainly physical changes. While removing the volatile matter, decompostion and polymerization happen as chemical changes. Starting from 200~300C , the combustible gases, also known as voltile matter, are burning out. The higher the temperature is, the larger amount of volatile matter comes out. At 500~700C, the removing amount peaks. When the temperature gets even higher, the removing amount gets less sharply. Till above 1100 , the removing process stops and the volatile matter is lessened to below 0.5%.

The Change in Real Density of Petroleum Coke
The Real Density of petroleum coke is raised from 1.42-1.61g/cm3to 2.00~2.12g/cm3 atter the calcining process. As the temperature changes, the real density changes accordingly, which means that the real density directly rflets how and at what temperature the petroleum coke is being calcined. Because the voltile matter is removed and decomposition and polymerization happen, the structure is remodeling, the volume becomes smaller, and the real density gets higher. Because the real density can show how the coke is densified and regularized so that it can mark the quality of calcined petroleum coke and the calcining process. Generally speaking, at the same temperature, the higher the real density is, the more easily the calcined petroleum coke gets graphitized.

The Change in Oxidation Resistance of petroleum coke
As the temperature rises, imurites are gradually removed, and the chemical activity gets down. Meanwhile, the hydrocarbon escaped in the calcining process forms a shining pyrolysis carbon film with steady chemical property, thus the oxidation resistance of calcined petroleum coke is improved.

The Change in Volume of Petroleum Coke
All kinds of petroleum coke will get contracted after being calcined, while the degree of contraction is diferent. The petroleum coke with more volatile matter and bigger escaping amount will be contracted into a smaller volume. For instance, its contraction rate can be over 20%. Generally the physicochemical changes are dependent on the property of petroleum coke and the calcining temperature. The highest temperature of calcining will be at around 1250C, and the carbon atoms in petroleum coke are of ordered arrangement in two-dimensional space.

To Remove the Volatile Matter and Water in the Raw Material
There is a certain amount of voltile matter and 3%-10% water in petroleum coke. By burning out the volatile matter and water, the content of fixed carbon will be raised, the following processes of smashing, sieving and grinding etc. will be better done, and the product quality will be higher.

To Increase the Real Density and Mechanical Strength
Because the voltile matter is burned out in the calcining process, petroleum coke gets a smaller volume, better real density, mechanical strength, and heat endurance. Calcining the petroleum coke completely helps ensure the quality of carbon products.

To Improve the Conductivity
After being calcined, the molecular structure of petroleum coke is changed, and the electrical resistivity is lowered, thus conductivity is raised. Generally a better calcining process results in better conductivity, which is important for carbon products.

To Raise the Oxidation Resistance
As the temperature rises during the calcining process, pyrolysis and polymerization begin, and hydrogen, oxygen and sulfur are burning out. The chemical activity gets down, and the physicochemical property becomes steady so that the oxidation resistance is raised.

Calcined petroleum coke is primarily used in the chlorination stage of the chloride process for titanium dioxide (TiO2) production, serving as a reducing agent and energy source at high temperatures.

Petroleum coke is mixed with ore and reacts with chlorine gas at high temperatures to produce crude TiCl4, which contains various impurities. This process is a critical step in the chloride method for producing titanium dioxide, where petroleum coke plays an indispensable role. Its strong reducibility effectively converts the titanium in the ore into titanium chloride, laying the foundation for subsequent oxidation and refining processes.

In the oxidation stage, the refined TiCl4 obtained from the chlorination section needs to react with oxygen at high temperatures to form titanium dioxide and chlorine gas. Although petroleum coke does not directly participate in the chemical reactions in this phase, its role in the earlier chlorination stage significantly impacts the efficiency and quality of the entire oxidation process.

In the post-treatment stage, the main activities include cooling, separating, dechlorinating, and surface treating the produced titanium dioxide. At this stage, the direct role of petroleum coke has diminished, but the reaction basis it provides in the initial phase is still crucial for the smooth progress of the overall production process.

The unique structure and properties of calcined petroleum coke also make its application in titanium dioxide production more extensive. For example, by adjusting the calcination conditions, one can optimize the pore structure and reactivity of petroleum coke, further improving the production efficiency and product quality of titanium dioxide. Additionally, calcined petroleum coke can serve as an electrically conductive material or heat transfer material during the titanium dioxide production process, enhancing equipment lifespan and safety. 

The company now has 2 modern production workshops and 2 large storage workshops, which can meet the needs of large-scale production and fast logistics. The annual production volume has reached 100,000 tons. After years of hard work, we have worked closely with many domestic companies and exported to many countries and regions. In the future, the company will continue to adhere to the business philosophy of "quality-oriented, honesty and trustworthiness", continuously improve product quality and service level, carry out extensive cooperation and exchanges with domestic and foreign companies, and jointly promote the development of the carbon industry.