Because carbon fiber is expensive, good comprehensive performance, mostly used in high-end military and civilian or special areas, its product scrap procedures are strict, so not reused or unlikely, because its carbon content is more than 90% or unlikely, and the manufacturing cost is much higher than conventional fiber, such as the use of open-air direct incineration or cement manufacturing and another indirect incineration method to deal with, not only serious pollution And very uneconomical, that is, social and economic benefits are poor, and chemical hydrolysis is mostly used in the core structure of composite waste recycling. In addition, the low-cost direct burial method commonly used in the early waste disposal, in many years or never rot at the same time to extract toxic substances, and then long-term pollution of soil and groundwater systems, the later will be the environment and other related regulations gradually prohibited. In summary, the possible methods of waste disposal of carbon fiber composite materials are mechanical material recycling method, material recycling, and energy recovery method 2 kinds. However, in the later comparative analysis, the method of energy recovery and incineration, such as cement manufacturing, is still included in the scope of discussion.
Carbon fiber (CF) is a black inorganic polymer fiber made of carbon elements, with the molecular structure of the boundary between graphite and diamond. It has the characteristics of thermal conductivity, conductivity, high-temperature resistance, friction resistance, corrosion resistance, etc. It's mainly used to enhance resin, metal, ceramics, cement and other substrate materials as an advanced structural material, and is widely used in all walks of life. The emergence of carbon fiber and its composite materials is more recently known as the "black revolutionaries of the 21st century."
The Value and Significance of Carbon Fiber Waste Recovery
Just as everything has its two sides, carbon fiber has its own limitations with its own superior properties, which are incomparable to those of other enhanced materials mentioned above. Its limitations are mainly reflected in 3 aspects: First, poor impact resistance, easy to damage, and the stress-strain relationship curve is similar to the straight line, which leads to the design of its axial strength waste. Second, under the action of a strong acid, it is easy to oxidize, and metal composite will occur metal carbide, carburizing and electrochemical corrosion. Third, the production technology is difficult, high energy consumption, serious pollution, high price (for E-glass fiber 20 to 200 times).
The feasible methods of composite waste disposal include burial, reuse, mechanical material recycling (also known as physical crushing method), incineration, material recycling and energy recovery (also known as physical chemistry), chemical hydrolysis, cement manufacturing, and other 7 categories.
Post time: Sep-26-2019