这些高毒性物质通常是从煤或沥青炼制而来，而有导致癌症的可能。
These are usually highly toxic substances from coal or from asphalt refining, and has led to cancer.
以沥青焦、煤沥青以及氧化沥青为原料，采用KOH活化法制备高比表面积活性炭。
Activated carbons were prepared from asphalt coke, pitch and oxidated pitch by KOH activation method.
研究了用于制备高比表面积活性炭的改质煤沥青的调制方法。
Methods of modified coal tar pitch for preparing high specific surface area activated carbon were studied.
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