瓦斯灰类高氯锌渣脱氯及联产氯化铵可行性研究

Feasibility Study on Dechlorination from High Chlorine Zinc Slag of Gas Ash and Co-production of Ammonium Chloride

为了减少瓦斯灰类高氯锌渣的大量堆积对环境带来的污染及提高其综合利用率,针对传统方法丢弃氯离子的问题,采用水洗—氨化两段式方法,进行了高氯冶炼渣脱氯试验研究。试验结果表明:在研磨细度0.2 mm、固液比1∶10、反应时间1 h、反应温度60℃的条件下,脱氯率达95%;通过添加适量氯化钙和碳酸氢铵,减压蒸馏、冷凝、结晶后,得到了农业用氯化铵合格产品,其质量达到国标《氯化铵》(GB/T 2946—2018)要求,实现了氯离子的资源化利用。

In order to reduce the environmental pollution caused by the large accumulation of high chlorine zinc slag in gas ash and improve its comprehensive utilization rate,aiming at the problem of dis⁃carding chloride ions by traditional methods,the dechlorination test of high-chlorine smelting slag was car⁃ried out by washing-ammonification two-stage method.The results show that the dechlorination rate was 95%under the conditions of grinding fineness 0.2 mm,solid-liquid ratio 1:10,reaction time 1 h and reac⁃tion temperature 60°C.By adding appropriate amount of calcium chloride and ammonium bicarbonate,after vacuum distillation,condensation and crystallization,the qualified product of ammonium chloride for agri⁃cultural use was obtained.Its quality met the requirements of the national standard“ammonium chloride”(GB/T 2946-2018),and the resource utilization of chloride ions was realized.