刚果(金)某低钴浓度铜萃余液除铁处理

研究了用中和沉淀法去除刚果(金)某低钴浓度铜萃余液中杂质铁过程。针对该铜萃余液中铁主要以三价离子形态存在的特点,通过对硫酸盐溶液中不同除铁方法的比较,结合刚果(金)当地的能源供应条件,选择中和沉淀法进行低钴浓度铜萃余液除铁处理。通过试验,重点考察中和除铁过程终点pH值、氧化钙调浆浓度、反应温度、反应时间等工艺参数对除铁效果及有价金属铜和钴损失的影响。试验结果表明,在氧化钙调浆浓度20%,终点pH值控制3.5,反应温度40℃,反应时间5h的条件下,铜萃余液中铁的去除率达到97.14%,铜、钴在除铁过程中的损失率分别为1.02%和0.66%。

Fenton接触氧化法强化石英砂—锰砂滤料处理铁锰矿井废水

为了解决目前常用的接触氧化法除铁除锰工艺中铁离子存在时锰离子难去除的问题,本文重点研究了Fenton接触氧化法强化石英砂-锰砂滤料的除铁除锰效率和机理。结果表明:Fenton试剂+锰砂+石英砂工艺除铁锰的效果很好,影响因素的最佳值如下:加入H2O2形成Fenton试剂后可以强化石英砂-锰砂工艺除铁除锰的效果,当H2O2投加量为0.15 mg/L、滤速为8 m/h、pH为7时,铁离子的去除率可达到92%,当H2O2投加量为0.17mg/L、滤速为8 m/h、pH为7时,锰离子的去除率可以达到97%。

用减压蒸馏法降低苯酚磺酸镀锡液中的Fe^(2+)

采用减压蒸馏的方法,研究了不同浓缩程度下镀锡液中Fe2+降低的情况,同时监测了Sn2+的损失情况,比较了减压蒸馏法和直排法(废水处理成本)的经济效益;从环保和成本的角度找出更合理的酸性镀锡废水处理方法及工艺条件。结果表明:本方法更经济、更环保。

Electrochemical Treatment of Distillery Spent Wash Using Aluminum and Iron Electrodes

Electrochemical treatment of distillery .spentwash was carried out using different combinations of aluminum and iron electrodes in batch mode of operation. The spent wash was characterized for various parameters as per standard method of analysis and the treatment results were analyzed in terms of chemical oxygen demand （COD） removal efficiency o.f thespent.wash. The experiments were performed to s.tudy the effect of operating parameterssuch as current density, pH of the spent wash, agitation speed, electrolysis time and the distance between the elec- trodes on the COD removal efficiency of the spent wash. It was observed that aluminum electrodes were more suitable for treatment of distillery spent wash as compared to iron electrodes. The maximum COD removal effi- ciency of 81.3% was obtained with A1-A1 electrodes at the current density of 0.187 A.cm-2 and pH 3 for an elec-trolysis time of 2 h.