摘要
以碱性钢渣为水处理材料,研究了其吸附、中和酸性含Ni(Ⅱ)废水的工艺过程和机理。结果表明:在钢渣粒度小于2 mm、用量10 g/L、温度25℃、搅拌强度100 r/min条件下钢渣与Ni(Ⅱ)浓度200 mg/L、pH值4.8的废水反应8 min,可使废水中Ni(Ⅱ)浓度降低到0.25 mg/L,pH值升高到7.2,达到GB8978-1996《污水综合排放标准》的要求。钢渣对酸性废水中Ni(Ⅱ)的吸附符合Langmuir等温吸附式,其饱和吸附量达37 mg/g,反应包括钢渣中碱性物质的水解、Ni(Ⅱ)生成Ni(OH)2沉淀、生成的Ni(OH)2沉淀吸附于钢渣表面等几个过程。X射线衍射分析证明钢渣表面吸附了Ni(OH)2沉淀物。
The process and mechanism of the adsorption and neutralization of acidic wastewater containing Ni（Ⅱ） by steel slag,the solid waste produced from steelmaking industry were studied in detail.The results showed that after 8 min adsorption treatment at（25 ℃）,the concentration of Ni（Ⅱ） in acidic wastewater was reduced from the initial（200 mg/L） to（0.25 mg/L） and effluent pH was increased from the initial 4.8 to 7.2 under treatment conditions of steel slag size of（2 mm）,concentration of（10 g/L） and mixing speed of（100 r/min,） which could meet the requirements in ＂Integrated Sewage Discharge Standard＂（GB8978-1996）.The adsorption of Ni（Ⅱ） in acidic wastewater on steel slag follows the Langmuir isothermal adsorption with saturated adsorptive capacity of（37 mg/g.） It indicated that the adsorption and neutralization of acidic wastewater containing Ni（Ⅱ） by steel slag included three sequence processes： hydrolyzation of the alkaline compositions such as 3CaO·SiO2,2CaO·SiO2 in steel slag,precipitations of Ni（OH）2,deposition of Ni（OH）2 on the surface of steel slag.XRD analysis showed that the adsorption of Ni（OH）2 existed on steel slag.
出处
《环境工程》
CAS
CSCD
北大核心
2009年第6期50-53,93,共5页
Environmental Engineering
关键词
钢渣
废水
Ni(Ⅱ)
吸附
中和
steel slag
wasterwater
Ni（Ⅱ）
adsorption
neutralization
