摘要
煤焦化过程中产生大量的H_(2)S、SO_(2)等有毒有害气体,这些气体在水中的溶解度较低,现工艺主要使用氨水中和废气进行处理,但处理后生成了包括硫化铵、硫氢化铵以及亚硫酸铵、亚硫酸氢铵等混合物,无法利用并产生新的难处理含硫氨氮废水。以氯化镍为催化剂催化空气氧化处理上述含硫氨氮废水,成为农业用硫酸铵液体肥料,建立了一条清洁处理上述工艺废水的技术路线。考察了催化剂种类和用量、pH值、反应温度、反应时间、空气流量等对反应结果的影响。采用正交实验设计建立了优化的工艺技术条件,即:用氯化镍作为催化剂进行催化,其用量为10%,pH为9~10,反应温度为55℃,空气流量为40 mL·min^(-1)的最优条件下反应100 min,氧化去除了98%以上的S_(2)-。复配后产品经检验达到了《肥料级硫酸铵》(GB/T535—2020)金属离子限量标准要求。
The coal coking process produces a large amount of toxic and harmful gases,such as H_(2)S and SO_(2),which have low solubility in water.The present process mainly uses ammonia to neutralize the waste gases for treatment,but the treatment generates a mixture including ammonium sulfide,ammonium sulfide and ammonium sulfite and ammonium bisulfite,which cannot be used and generates new difficulty to treat sulfur-containing ammonia-nitrogen wastewater.In this paper,a technical route for clean treatment of the above process wastewater was established by catalytic air oxidation of the above sulfur-containing ammonia-nitrogen wastewater into liquid ammonium sulfate fertilizer for agriculture using nickel chloride as a catalyst.The effects of catalyst type and dosage,pH value,reaction temperature,reaction time and air flow rate on the reaction results were investigated.An orthogonal experimental design was used to establish the optimized technological conditions of the process,namely:using nickel chloride as catalyst for catalysis,its dosage 10%,pH 9~10,reaction temperature 55℃,air flow rate 40 mL·min^(-1)reaction time 100 min.Under the optimal conditions,the S_(2)-removal rate was more than 98%.The compounded product was tested to meet the requirements of metal ion limits in Fertilizer Grade Ammonium Sulfate(GB/T535—2020).
作者
史笑飞
杨茜
苗祯
章亚东
SHI Xiao-fei;YANG Xi;MIAO Zhen;ZHANG Ya-dong(School of Chemical Engineering,Zhengzhou University,Zhengzhou Henan 450001,China;Jiyuan Research Institute of Zhengzhou University,Jiyuan Henan 459000,China)
出处
《当代化工》
CAS
2023年第1期107-111,共5页
Contemporary Chemical Industry
基金
河南省工程实验室开放课题基金(项目编号:JMNY2020-08)。
关键词
焦化废水
硫化物
催化氧化
氯化镍
Coking wastewater
Sulfide
Catalytic oxidation
Nickel chloride
