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介绍了当前电子废弃物中常用的浸金方法及其优缺点, 分析了电子废弃物中硫代硫酸盐法浸金的研究现状。针对这一研究现状, 本文采用碱性Na2S2O3溶液中添加Cu2+的方法, 对废旧IC(integrated circuit)芯片中金的浸出进行了试验研究。通过对IC样品进行机械预处理、粒度分析、解离度分析、化学预处理和浸金试验, 探讨了Na2S2O3浓度、Cu2+浓度、NH3浓度、浸出温度、浸出时间和反应液固比6个因素对金浸出率的影响。试验得出最佳浸金条件为:Na2S2O3浓度0.3mol/L, Cu2+浓度0.03mol/L, NH3浓度0.5mol/L, 添加3.5g/L的Na2SO3作为稳定剂, 浸取温度50℃, 浸取时间2.5h, 液固比10:1, 在最佳浸出条件下, 金的最高浸出率为92.25%。与传统方法相比, 该方法具有浸出速度快、浸出液无毒、操作简单等优点, 是一种具有开发潜力的电子废弃物浸金方法。 相似文献
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溴化法浸取硫化矿中的金 总被引:1,自引:0,他引:1
用溴化法浸取金矿中的金是一种较新的非氰化浸金方法。实验表明:对于含金量为8.32g/t的某硫化矿,经800℃ 焙烧后,在常温下,NaBr浓度为0.3mol/L,PeCl3浓度为0.08mol/L及加入适量H2O2和NaClO的条件下,6h可以浸出75%以上的金。该方法具有环境污染程度小,操作简单等优点,有重要的工业应用推广价值。 相似文献
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金的物相分析—混汞浸取法 总被引:1,自引:0,他引:1
本法称取两份样品。第一份样品用混汞法分离游离自然金,然后用碘-碘化钾溶液浸取连生体金。第二份样品经灼烧后,用碘-碘化钾溶液浸取游离自然金、连生体金、硫化物中金,减去第一份样品中浸取出的游离自然金、连生体金为硫化物中金。残渣用氢氟酸-王水分解,为其他矿物金。 相似文献
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酸法浸取粉煤灰制取氧化锗和氧化铝的研究 总被引:3,自引:0,他引:3
报导了用硫酸浸取粉煤灰后,进一步用萃取法提取GeO2和复盐热解法制取Al2O3的最佳实验条件和工艺参数。方法工艺流程简单,锗和铝的回收率高,可消除“灰害”,变废为宝,使粉煤灰得到高技术应用。 相似文献
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谈谈两段焙烧法预处理高硫砷难浸金精矿 总被引:4,自引:0,他引:4
简述焙烧氧化法用于难处理金矿的优越性及其在国内外的应用概况,指出应用两段焙烧法处理含砷硫金矿是必要的。阐述两段焙烧法的基本原理,工艺流程,并介绍进料、焙烧、烟气净化处理等主要作业的实际控制和操作方法,列举出国内外三厂的生产实例。介绍目前我国应用两段焙烧法存在的问题及改进措施。 相似文献
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氨法浸取铜包钢制氯化亚铜 总被引:4,自引:1,他引:3
利用铜与氨在一定的条件下可以形成络合物,而铁在这一条件下不能与氨反应,将铜铁分离。从而使铜包钢中的铜最终生成氯化亚铜。这一研究已批量生产 相似文献
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研究了硼砂电解电渗析制取硼酸和烧碱(EBS法)新工艺中阳极、阳离子膜及阴极碱浓度等因素的影响。结果表明,离子膜的选择对槽电压、电流效率以及电耗有着决定性的影响。较适宜于EBS体系的阳离子膜为Nafion901膜;PbO2/Ti阳极在EBS体系中性能稳定,消耗低,是一种实用的阳极。 相似文献
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高苛性化系数铝酸钠溶液深度脱硅 总被引:1,自引:0,他引:1
研究了高苛性化系数铝酸钠溶液的深度脱硅.对加入CaO和C3AH6(3CaO·Al2O3·6H2O)的脱硅反应进行了热力学计算,并对NawO浓度、脱硅反应温度对脱硅精制液中SiO2浓度、脱硅率、硅量指数的影响进行了研究。结果表明,添加C3AH6一步脱硅,精制液硅量指数可达10000以上. 相似文献
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Chlorine dioxide was used to treat water treated with potassium ferricyanide to simulate ferricyanide wastewater. The ferricyanide was strongly oxidized by chlorine dioxide in the presence of sodium tripolyphosphate, with a final total cyanogen content of less than 0.011 mmol/L after the treatment. The treatment could be carried out successfully at ambient temperatures, and we established the following optimum conditions: a molar ratio of sodium tripolyphosphate to ferricyanide of 1.17, a treatment time of 60 min, and a molar ratio of chlorine dioxide to ferricyanide of 7. 相似文献
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Chlorine dioxide was used to treat water treated with potassium ferricyanide to simulate ferricyanide wastewater. The ferricyanide was strongly oxidized by chlorine dioxide in the presence of sodium tripolyphosphate, with a final total cyanogen content of less than 0.011 mmol/L after the treatment. The treatment could be carried out successfully at ambient temperatures, and we established the following optimum conditions: a molar ratio of sodium tripolyphosphate to ferricyanide of 1.17, a treatment time of 60 min, and a molar ratio of chlorine dioxide to ferricyanide of 7. 相似文献
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Development of duplex stainless steels has been linked strongly with the increasing requirements of the industry for resistance of materials to highly aggressive environments. In the present work, the effects of bromide and chloride ion concentrations and temperature on the pitting corrosion of commercial grade SAF2205 duplex stainless steel were studied. Cyclic polarization and scanning electron microscopy (SEM) techniques were used to study the pitting corrosion behavior of this steel in 80%v/v acetic acid solution containing 0.01, 0.1, 0.2, and 0.5 M sodium bromide and sodium chloride, respectively. Pitting potential was found to decrease with the increase of the temperature and bromide ion concentration. In the presence of chloride ions, pitting corrosion was not observed at room temperature. Critical pitting temperature in chloride-containing solutions was estimated to be above 35°C. In the case of pitting, SEM observation revealed that pit initiation is in the austenite phase regions. 相似文献
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The alkalyne leaching of spent alumina-based catalysts from the petroleum industry, containing molybdenum and/or vanadium among other metals, yields a solution rich in Mo(VI), V(V) and Al(III). In order to recover the two heavy metals aluminum must be first quantitatively separated. Several routes were theoretically tested by computer simulation. Finally, the extraction of aluminum with oxine was chosen. A commercial reagent similar to oxime, LIX 26 (Henkel), was used. The extraction of the three metals with several organic phases containing LIX 26 /n-octanol /hexane was systematically studied.|The best separation conditions were found to be 7<pH<8, 0.3% LIX 26 and 10% n-octanol. A two step counter-current extraction with equal volumes of the two phases gives 99.6% extraction of Al(III) with less than 1 ppm of Mo(VI) and V(V). The organic phase can be regenerated by contacting with sulphuric acid, at pH<2, where aluminum is quantitatively stripped. 相似文献