摘要
以一种新型煤基电吸附材料为极板,采用电吸附技术处理高浓度氰化提金废水。主要研究了吸附电压、电吸附时间对废水中游离氰及金属氰络离子吸附率的影响,采用扫描电镜(SEM)、能谱分析(EDS)及X射线衍射(XRD)等对吸附后的电极片及过程产生的沉淀物进行了分析表征。研究表明,当吸附电压为2.0 V、极板间距1 cm、吸附时间为24 h时,溶液中铜、总氰、锌、铁和硫氰酸根的去除率分别达到61.55%,71.14%,99.52%,83.28%及58.59%。电吸附过程中,在阳极和阴极附近会产生絮状沉淀物,其主要组成为亚铁氰化铜、硫氰化亚铜和氢氧化锌,同时吸附后的阳极板上出现了铜、铁与锌离子的富集。高浓度氰化提金废水的电吸附过程同时包含了离子的定向迁移、富集沉淀以及阳极吸附3个过程,三者共同作用下体系中各离子含量将会大幅度降低,处理后溶液可直接返回浸出系统循环使用。
Electric adsorption technology was used to treat high concentrated wastewater from cyanide-extracting gold process by elec- trode which consisted of new coal-based electric adsorption material. The effects of adsorption voltage, adsorption time for the adsorp- tion rate of free cyanide and metal cyanide complex ions were mainly studied. Scanning electron microscope （ SEM）, energy spectrum （EDS） and X-ray diffraction （XRD） were applied to analyze the electrodes after adsorption and precipitates generated during the process. The results showed that the removal rates of cupric ion, total cyanide, zinc ion, iron ion and thiocyanate ion were 61.55%, 71.14%, 99.52%, 83.28% and 58.59%, respectively, with the applied voltage of 2.0 V, plate spacing of lcm and adsorption time of 24 h. Flocculent precipitates were generated in the vicinity of the anode and cathode during the electric adsorption process, which mainly consisted of copper ferrocyanide, cuprous thiocyanate and zinc hydroxide. And copper, iron and zinc were enriched in the anodic plate. The electric adsorption process of high concentrated wastewater from cyanide-extracting gold process contained directional migration, enrichment and precipitation, anodic adsorption of ions, and the ion content in the system was significantly reduced by the combination of these. The solution which directly returned to leaching system after processing could be recycled.
出处
《稀有金属》
EI
CAS
CSCD
北大核心
2016年第5期492-498,共7页
Chinese Journal of Rare Metals
基金
国家自然科学基金青年基金项目(51204130)
陕西省教育厅重点实验室专项项目(13JS059)
陕西省自然科学基础研究计划资助项目(2012JM7013)资助
关键词
煤基电吸附材料
氰化废水
电吸附
coal-based electric adsorption material
cyanide wastewater
electric absorption
