Utilization of waste wood as charcoal absorbent for exhausted gas in iron and steelmaking process

A purification system of exhausted gas from refining furnace in iron and steelmaking process is proposed for utilization of waste wood as a charcoal absorbent. This system could solve the problems of both the treatments of heavy metals contained in wasted preservative treated wood and dioxins in the exhausted gas. The effect of temperature, atmosphere, sample size and holding time on the specific surface area and pore size distribution of a charcoal carbonized from Cryptmeria is examined to clarify the carbonization conditions for the charcoal absorbent. The results are as follows The specific surface area has a maximum at 1073K of carbonizing temperature in N-2+O-2 atmosphere. The high oxygen concentration in carbonizing atmosphere and the long holding time lead to the increase of the specific area of the charcoal. The maximum specific surfacer area of the charcoal in this experiment is 582m(2)/g, which is about 74% of that of commercial activated charcoals. The charcoal is considered to be used as a absorbent for exhausted gas.