共查询到19条相似文献,搜索用时 78 毫秒
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采用氧气湿法酸浸技术对内蒙霍格旗低品位难选硫化铜矿进行了浸铜试验,以纯氧作氧化剂,氯离子为催化剂,在密闭条件下,硫酸浸出Cu^2+,经铁屑还原制备出海绵铜。考察了矿石粒度、酸用量、固液比、温度、三氯化用铁量对铜浸出率的影响,确定了最佳浸出工艺条件,在最佳浸出工艺条件下,铜的浸出率达到98%;浸出液除杂后,采用还原铁粉置换,考察了置换时间、pH、温度和还原铁粉用量对铜单质生成的影响,在最佳置换工艺条件下,制备出的海绵铜含量为80.1%。工艺采用闭路循环,可充分利用资源,反应时间缩短,反应温度降低,且克服了火法炼铜中二氧化硫对环境的污染,为硫化铜矿的湿法冶炼开辟了一条新途径。 相似文献
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研究了甲苯氯化得到苄叉二氯和氯化苄混合物,然后经ZnO催化酸解,稀硝酸氧化制备苯甲醛,并探讨了氯化、仙伦酸解及氧化的反应条件。 相似文献
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硫化铜精矿催化氧化氨浸工艺研究 总被引:6,自引:0,他引:6
提出了硫化铜精矿催化氧化氨浸提铜方法。在NH+4 浓度为300g/L、氧化剂SN22 浓度为60kg/t、催化剂AN31 用量为0-2kg/t、液固比为5 的条件下,常温搅拌4h,铜的浸出率可达80-25 % 。 相似文献
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磷矿浆催化氧化湿法脱硫研究(Ⅱ) 总被引:2,自引:0,他引:2
本文进一步讨论了磷矿浆湿法脱硫的方法.实验考察了磷矿浆液相催化氧化净化低质量浓度SO2气体时,气体氧体积分数和SO2气体质量浓度对净化脱硫的影响,得出了一条SO2质量浓度与氧气体积分数比与反应时间关系的线性方程,并在磷化工厂对此脱硫方法进行了现场试验,取得了较好的净化效果. 相似文献
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本文采用浸渍过S催化剂的颗粒活化炭,当铜氰废水流经反应塔时,由于空气中的氧和铜离子及S催化剂的作用,氰根在活性炭上被催化氧化而分解成氨和碳酸根,氨成气相逸出,碳酸根与铜离子生成碱式碳酸铜而被活性炭所吸附。达到饱和后,用20%H_2SO_4,溶液再生,再生时生成硫酸铜。经过在杭州自行车厂一年来的生产运行结果,对〔CN~-〕<30mg/L,〔Cu~(2+)〕<25mg/L的电镀废水,其处理结果可达到国家排放标准,该设备具有结构紧凑,占地面积小,操作简单,运行费用低,投资省等优点。 相似文献
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催化氧化法处理染料废水 总被引:9,自引:1,他引:9
本文提出催化氧化法用于废水处理。并对不可生化染料废水进行了较系统的研究。运用正交实验设计方法进行实验,确定了最佳操作参数。在最佳条件下,使染料废水色度去除率达98.7%,CODcr去除率达86.3%。该法具有设备简单,占地少、处理效率高的特点。 相似文献
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太阳能硅制备过程湿法提纯SiO2的工艺优化 总被引:1,自引:0,他引:1
考察了HF质量分数、H2C2O4质量分数、HNO3质量分数、酸浸时间、粒径、液体质量与固体质量的比值(简称液固比,下同)等因素对混酸法提纯SiO2工艺过程的影响,利用电感耦合等离子体发射光谱仪(ICP-OES)、场发射扫描电子显微镜(SEM)进行表征。结果表明,最佳工艺条件为:w(HF)=2%、w(H2C2O4)=3%、w(HNO3)=30%、酸浸时间4 h、粒径100~120目、液固比4∶1、酸浸温度30℃。Fe、Al、Ca、P杂质的去除率分别达到99.99%、14.02%、73.27%、60.00%,经混酸法处理后SiO2中杂质总量的质量分数降至1.465×10-4。 相似文献
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配位催化氧化合成邻硝基苯甲醛的工艺研究 总被引:1,自引:0,他引:1
以铜盐为催化剂,空气为氧化剂,在1,10-菲咯啉和肼二甲酸二乙酯存在下由邻硝基苯甲醇氧化制得邻硝基苯甲醛,反应条件温和,无环境污染问题,收率较现行的稀硝酸氧化工艺高10%,原材料成本显著降低,有工业应用前景,讨论了反就机理和影响反应过程的因素。 相似文献
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In this paper, we have studied the parameter sensitivity of two hydrometallurgical models: REACTSIM (for gold pressure oxidation) and ZINCSIM (for zinc pressure leaching). The parameters investigated include: the oxygen mass transfer coefficient, kLa, the activation energy for pyrite oxidation, Ea, pyrite and marmatite dissolution stoichiometry, the constant kinetic parameter for ferrous to ferric oxidation and the apparent equilibrium constant for ferric precipitation, KE. Model predictions were found to be more sensitive to the kinetic parameters under certain conditions than others. For ferrous to ferric oxidation kinetics, a dramatic model sensitivity was found to the constant kinetic parameter with an apparent discontinuity at values close to those found in bench scale experiments. The usefulness of simulation programs was demonstrated when non-intuitive results were obtained showing ZINCSIM sensitivity to sulphate production to be opposite from what was expected. In the case of KE, solution chemistry was not as sensitive as the heat balance, which was affected significantly. 相似文献
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This work reports the influence of pH on the catalytic wet oxidation (CWO) of phenol performed with a commercial copper-based catalyst. The results obtained show that pH is a critical parameter able to modify the chemical stability of the catalyst, the significance of the oxidation reaction in the liquid phase, the reaction mechanism and, consequently, the oxidation route of phenol. Experiments have been carried out to study the mentioned aspects. Stirred basket and fixed bed reactors (FBRs) have been employed, at 140 °C and at 16 bar of oxygen pressure. Three initial pH values have been used: 6 (the pH of the phenol solution), 3.5 (adjusted by H2SO4) and 8 (by addition of Na2CO3). Furthermore, some phenol oxidation runs without solid catalyst but with different concentrations of copper in solution have been accomplish at pHo=3.5. At acid pH, important leaching of copper from the catalyst to the solution was achieved, finding this negligible at pH 8. It was found that the major contribution to the phenol conversion reached at acid pH by using the solid catalyst was due to the catalytic activity of the leached copper. Both oxidation mechanisms at acid and basic conditions have been elucidated to explain the differences in the type and distribution of the intermediates obtained. The catalytic phenol oxidation route found at pH=8 comprises intermediates less toxic than phenol while at acid pH the cyclic intermediates formed as first oxidation intermediates are far more toxic than phenol. 相似文献
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通过浸渍法制备了包含四类主活性组分的负载型催化剂,用于二氧化氯催化湿式氧化(CWCDO)处理印染废水、有机农药废水.由实验确定了催化湿式氧化的条件,结果表明,四元组合MnO2-CuO-CeO2-V2O5(质量比为2:4:1:1)催化剂性能较好,反应在常温常压下,维持pH为3.0~5.0,反应时间为30 min时,COD的去除率大于85%,色度去除率大于90%. 相似文献
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