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美国燃煤灰渣产量,久居世界第二位,近年迅速增长到每年6000多万吨。根据美国《矿物年鉴》报道,灰渣在国家最丰富的固体矿物资源的行列中,已经从第七位上升为第六位。美国灰渣利用起步很早,但是,由于排放量增长较快,利用率多年徘徊于20%左右,粉煤灰资源他的进展不甚理想。1976年美国国会通过了环境保护局所提出的新法规,将粉煤灰在水
The output of US coal-fired ash slag has long been ranked second in the world, and has rapidly grown to more than 60 million tons per year in recent years. According to the US “Mineral Yearbook,” ash has risen from seventh to sixth in the nation’s richest solid mineral resources list. U.S. ash use started very early, but due to the rapid growth in emissions, the utilization rate has hovered around 20% for many years, and his progress in fly ash resources is not satisfactory. In 1976, the U.S. Congress passed the new regulations put forward by the Environmental Protection Agency and put fly ash in water.