Product Introduction
Coal tar pitch, also known as coal tar pitch, is a type of artificial pitch that refers to the residue left after the distillation and processing of coal tar to remove liquid fractions. It is generally a viscous liquid, semi-solid or solid, black in color and glossy, with a carbon content of about 92%~94% and a hydrogen content of about 4%~5%.
The main components of coal tar pitch are polycyclic and polycyclic aromatic hydrocarbons and their derivatives. The specific compound composition is very complex, and the differences in raw coal types and processing techniques can also lead to differences in composition. The current method mainly distinguishes based on the softening temperature it exhibits.
Coal tar pitch has the following characteristics:
- Low-temperature stability and easy softening when heated.
- Good adhesion with mineral aggregates.
- The climate stability is poor, and under the long-term comprehensive effects of heat, sunlight, oxygen, etc., the composition changes greatly, making it easy to age and become brittle.
- Poor plasticity, prone to cracking due to deformation under stress.
- Contains phenol, anthracene, naphthalene oil, and other components, so it has good anti-corrosion properties.
According to the different softening points, coal tar pitch can be divided into three categories: low-temperature pitch, medium-temperature pitch, and high-temperature pitch, each of which has two grades: grade 1 and grade 2. Its main uses include:
- Used as fuel: Due to its high solid content, it is generally mixed with heavy oil or made into a slurry for use, which can partially replace heavy oil.
- Production of carbon electrodes: Their carbon graphitization degree is relatively high, and they can be used as electrode materials for production, as well as wetting agents and binders.
- Paint production: After processing, it can be used as a waterproof coating for buildings and pipes, such as epoxy coal tar coating.
- Used for road construction and building materials: Generally mixed with petroleum asphalt, the performance of the mixed asphalt is better than using them separately, but coal tar has more harmful substances and needs to be treated harmlessly before use.
- Produce high-value-added products such as needle coke, activated carbon, carbon fiber, etc.
When using coal tar pitch, attention should be paid to its toxicity to avoid harm to human health, and environmental protection should also be taken into account to reduce pollution to the environment during its production and use.
