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解决方案&案例
韩城龙门脱硫脱氰废液水处理项目
项目背景
焦化厂焦炉煤气脱硫后生成的废水中盐分含量高,毒性大,已被国家列为危险废弃物,常规污水处理技术难以解决,成为影响焦化企业正常生产的症结问题。目前全国焦化产能大约 6.5 亿吨,焦炭年产量 4.3 亿吨,经过一段时间的并转,规模化的煤焦、化企业仍有300余家,理论上每家煤焦化企业都有这类技术和项目需求,但从建设费用和项目收益综合考虑,大型炼焦企业可以独立建设脱硫废液提盐装置。
工程任务
焦化脱硫废液提盐技术采用了环保技术和化工生产技术相结合的路线,废水经处理后可以循环使用,无外排污染环境的问题,并且可以从废水中提取并精制成高附加值的硫氰酸钠产品,以及硫铵、氨水,硫磺等其它副产物,该技术解决废水的污染问题,并转变为高附加值的产品,是体现循环经济特性的优质技术。
解决方案
本项目方案为在焦炉煤气脱硫脱氰废水中加入氧化催化剂,与废水中的硫代硫酸铵反应,生成硫酸铵及亚硫酸铵,进一步氧化成硫酸铵和硫磺,使废水由硫氰酸铵、硫代硫酸铵和硫酸铵三组份混合液变为易结晶分离的硫氰酸铵和硫酸铵二种组份混合液,再进行高效浓缩、分离硫酸铵、液体硫氰酸铵自然降温得到硫氰酸铵结晶,纯度可以达到98%以上;硫氰酸铵与液碱进行置换反应,生产附加值较高的硫氰酸钠产品。
取得成果
设计规模为13.2万吨脱硫废液/年,最大日处理量400吨,年产硫氰酸钠1万吨/年、硫铵1万吨/年、氨水1万吨/年,经济效益和社会效益俱佳。
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