钢铁厂酸洗废液无害化处置与资源化利用

Harmless Disposal and Resource Utilization of Pickling Waste Liquid from Iron and Steel Plant

钢铁厂酸洗过程中,有大量的酸洗废液外排。据不完全统计,全国每年排放超过2Mt。酸洗废液酸性强、浓度高、废液量大、易形成酸雾,若直接排放会造成严重的环境污染,威胁人类健康,已被列入《危险废物名录》。同时,把含有大量本应是宝贵资源的Fe2+、Fe3+和酸液当成"废物"直接处理后又排入环境的做法,远未能达到保护环境和回收资源的目的。本文介绍了当前主流的酸洗废液治理技术,包括中和法和回收铁盐法,期望在控制酸洗废液污染的同时,将其转变成一种有效的资源,实现无害化和资源化。

During the pickling process,there are a large number of pickling waste liquid discharged from the steel plant. According to incomplete statistics,the national annual emissions of more than 2Mt. Pickling waste liquor of strong acidity,high concentration, waste volume, easy to form fog, if the direct emissions will cause serious environmental pollution, a threat to human health, has been included in the “hazardous wastes”. At the same time,it is far from achieving the purpose of protecting the environment and recycling resources that the large amounts of Fe2＋ ,Fe3＋ and acid which are supposed to be valuable resources are treated directly as wastes and discharged into the environment. This paper introduces the current mainstream technology of pickling waste governance,including neutralization and recovery of iron salts, expect in pickling waste pollution control at the same time, transforming it into an effective resource, realize the harmless resource.