摘要
采用中和—过滤—换热—精馏—氨水回收的工艺处理钼酸铵生产废水,研究了各工艺参数对脱氨效果的影响、硫酸钙结垢机理和阻垢剂的阻垢性能与原理。结果表明,将pH调节至12.5以上能有效去除铜氨络离子,进而较彻底地去除氨氮;精馏塔的关键操作参数优化值为:塔釜温度105℃,蒸汽压力不低于0.3 MPa,优化后的精馏工艺,能够实现精馏设备的稳定运行和排水达标。阻垢剂在硫酸钙结垢形成之前添加效果最佳,阻垢原理为阻止溶解度较高的α-硫酸钙转化为溶解度较低的二水硫酸钙,从而提高结垢的浓度阈值。
Wastewater from ammonium molybdate production was treated by neutralization, filtration, heat exchange, distillation, and ammonia solution recovery. The effect of process parameters on ammonia removal efficiency, mechanism of calcium sulfate scaling, mechanism of scale inhibition and performance of scale inhibitor was investigated. The results show that copper ammonia complex is broken and ammonia is relatively thoroughly removed by adjusting pH value to 12 above. The distillation column operates steadily and water draining meets the standard with ammonia efficiently recovered under the optimum operation parameters of distillation column including temperature of 105 ~C and steam pressure of 0.3 MPa below. Scale inhibitor is to be added before formation of calcium sulfate scaling for the best. The mechanism of scale inhibition is to prevent high solubility of a-calcium sulfate from transforming into low solubility of dehydrate calcium sulphate, so as to increase concentration threshold of scaling.
出处
《有色金属（冶炼部分）》
CAS
北大核心
2015年第11期69-74,共6页
Nonferrous Metals（Extractive Metallurgy)
基金
环境保护部水体污染控制与治理科技重大专项(2013ZX07209001-1)
关键词
钼酸铵
氨氮
精馏
阻垢
废水处理
ammonium molybdate
ammonia nitrogen
distillation
scale inhibition
wastewater treatment
