(1. 广东省资源综合利用研究所,广州 510650;
2. 稀有金属分离与综合利用国家重点实验室,广州 510650;
3. 广东省矿产资源开发和综合利用重点实验室,广州 510650;
4. 中南大学 资源加工与生物工程学院,长沙 410083)
摘 要: 使用硫化烧结-浮选工艺处理含铜、镍的电镀污泥,采用MLA分析和扫描电镜分析等手段,研究污泥样品硫化烧结前后的性质变化;并通过Cu-S-O与Ni-S-O三元系等温优势区位分析,以及烧结的条件试验,确定了适宜的硫化烧结条件:硫化剂用量为20%,烧结温度为1100℃,烧结时间为90 min。通过烧结产品的闭路浮选试验,获得了铜、镍品位分别为10.14%和11.89%,铜、镍作业回收率分别为75.12%和70.02%的浮选精矿。通过浮选尾矿的浸出毒性鉴定,确定尾矿中有害金属元素的浸出毒性测试结果均小于国家标准。通过硫化烧结-浮选工艺,同步实现了含铜、镍电镀污泥的资源化和无害化处理。
关键字: 电镀污泥;硫化烧结;浮选;资源化;无害化
(1. Guangdong Institute of Resource Comprehensive Utilization, Guangzhou 510650, China;
2. State Key Laboratory of Rare Metals Separation and Comprehensive Utilization, Guangzhou 510650, China;
3. Guangdong Province Key Laboratory of Mineral Resource and Comprehensive Utilization, Guangzhou 510650, China;
4. School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China)
Abstract:The electroplating sludge is a kind of high toxicity and pollution industrial solid waste, which is greatly harmful on the environment as direct discharging. The sulfidation sintering-flotation process was used to dispose a copper-nickel-bearing electroplating sludge. The changes of mineralogy properties about the electroplating sludge before and after sintering were investigated by MLA analysis and SEM analysis. The isothermal predominance area phase diagrams of Cu-S-O and Ni-S-O ternary systems were drawn to analyze the optimum conditions of the sulfidation sintering. Through a series of conditional experiments, the optimum experimental conditions of sulfurizing reagent dosage, sintering temperature and sintering time were confirmed as 20%, 1100 ℃ and 90 min, respectively. By the closed-circuit flotation test of sintered products, the flotation concentrates with copper grade of 10.14% and nickel grade of 11.89% are obtained, and the recovery of copper and nickel are 75.12% and 70.02%, respectively. Moreover, in the leaching toxicity test of flotation tailings, the test concentrations of the poisonous heavy metal ions all reach the related government standards. Through the sulfidation sintering-flotation process, the goals of metal elements reclamation and harmless dispose of the electroplating sludge are both achieved.
Key words: electroplating sludge; sulfidation sintering; flotation; reclamation; harmless