从冶炼铜渣中进一步提取金银的湿法工艺研究

湿法冶炼中氰化金泥杂质元素含量的波动,容易造成冶炼副产品铜渣中的贵金属含量过高,从而影响到黄金精炼的回收率,直接关系到企业的经济效益。为了更有效地回收贵金属,提高企业经济效益,利用金银与其他贱金属的电位差异,通过加入氧化剂调整体系电位,以此达到金银与贱金属分离的目的。从铜渣中进一步提取贵金属工艺采用控电位氯化技术分离出杂质铜-废液置换铜-含金银渣进一步除杂分出金-剩下含银渣铸阳极板银电解回收银,来处理含金品位高的铜渣能够最终实现金、银、铜的分离,提高黄金冶炼回收率。     

Tellurium distribution in copper anode slimes smelting

Tellurium is a common minor constituent of copper anode slimes. The distribution of tellurium between the phases during slimes smelting is an important consideration, both in terms of metal quality and the capture of the oxidized tellurium. In this work, the oxidation by oxygen at 1100 °C of a silver-copper selenide matte containing 2 pct tellurium has been examined. The distribution of tellurium between the phases was determined as the extent of oxidation increased, and the system was modeled using a computational thermodynamics package. Oxidized tellurium was found to report to the slag, with none being removed with the gas. The thermodynamic model predicted, to an acceptable level, the tellurium content of all phases as oxidation progressed. It was used to show that oxidation by air rather than oxygen results in higher residual tellurium levels in silver metal and that the lower the smelting temperature, the greater the extent of tellurium elimination from silver to the slag.     

亚硫酸钠在稀贵金属冶金中的应用

系统总结了亚硫酸钠在稀贵金属冶金中的应用。主要阐述了从铜镍合金氯化渣中脱硫富集贵金属,从铜阳极泥分金渣中分银,从高硒、碲的铜阳极泥中分离回收金、钯、铂,硒、碲的分离提纯,在盐酸介质中还原精炼金,从负载有机相中反萃金,从弱酸性介质中还原银,制备金的电镀配合物等,以期为从事相关领域的科技人员提供参考。     

高铜铅氰化金泥的处理实践

高铜铅氰化金泥采用硫酸加络合剂联合酸洗去除铜锌等杂质后,在中频熔炼过程中利用还原气氛及金属铅捕集金银的超强能力,来降低渣中金银含量,在电解过程中,利用硫酸铅的低溶度积与银离子分离,消除铅的累积与循环。此工艺流程具有成本低,工序简单并能综合回收铜铅等有价金属等优点。     

造锍捕金工艺处理复杂金精矿试验研究

造锍捕金工艺具有处理规模大,生产成本低,物料适应性强等诸多优点。对某金精矿进行了造锍捕金试验研究。结果表明：与焙烧—氰化工艺相比,造锍捕金工艺各回收率均有很大提高,金提高了5.76%,银提高了47%,铜提高了12.67%,硫提高了2.52%。同时通过对造锍捕金熔炼工艺对比研究表明,底吹熔炼工艺更适于处理金精矿,对造锍捕金非常有利。     

Influence of gold content on copper oxidation from silver-gold-copper alloys

In the final stages of the smelting of copper anode slimes, a silver alloy, known as “doré,” is produced. Oxidation refining is used to remove copper since this element interferes with subsequent electroparting of the small amounts of gold and platinum group metals in the doré. The gold content of doré can be greatly increased by gold scrap additions and this may affect the minimum achievable copper content of doré. In this work, silver-gold-copper alloys were oxidized by injecting pure oxygen at 1100 °C in the absence of any slag cover. For the gold contents expected in practice, the equilibrium copper content of the doré did not increase significantly as the gold content increased. However, at the other extreme of composition, the equilibrium copper content was a very strong function of the silver content of the gold bullion. The activity coefficient of copper in silver-gold alloys was calculated and compared to those predicted from a ternary subregular solution model of the system Ag-Au-Cu. Satisfactory agreement was found.     

共沉淀富集分离矿石中微量金、铂、钯

研究了硒、铜、银、砷作为共沉淀剂。富集分离地质样品中金、铂、钯的最佳条件。在3mol/L HCl介质中，以4mg硒和5mg铜、银、砷对金、铂、钯进行共沉淀富集，采用孔雀绿分光光度法测定金．DDO分光光度法测定铂、钯，回收率均在95％-102％之间。通过对含金矿样加入铂、钯标准样品的回收实验，结果令人满意。     

用水氯化法从废水沉渣中提取金、银小型试验研究

某金银冶炼厂环保工序产出的废水沉渣是一种复杂的含金物料,金质量分数约1 000 g/t,银质量分数约500 g/t,还含有其它杂质如铜、硫、炭等。本研究采用焙烧-硫酸预处理-氯化湿法工艺从其中回收金,金浸出率为97.95%,银浸出率为79.86%,效果令人满意。     

碲渣综合回收工艺研究

简述了碲渣综合回收金银等的工艺试验碲渣经磨矿水浸碲产出粗二氧化碲,用离子沉淀和络合净化法提纯;浸碲渣用氯盐浸出铜铋,中和水解回收氯氧铋,置换回收海绵铜;残留渣中的金银可返回金银冶炼系统回收。对该工艺综合回收碲、铋、铜、金、银的经济效益进行了估算。     

卡尔多炉处理高杂铜阳极泥的工艺改进

随着铜闪速熔炼工艺日益成熟,对复杂铜矿的适应性越来越强,后续电解精炼产出更多杂质含量较高的铜阳极泥。针对杂质高、金银品位低的铜阳极泥,从卡尔多炉操作和配套设施工艺以及中间物料控制三方面进行了优化改造,使得卡尔多炉的年处理物料量从2 400t提升至3 800t,生产能力提高了58.3%,实现了金银产能的最大化。     

富氧底吹造锍捕金工艺研究

采用富氧底吹造锍捕金工艺处理复杂含铜、高砷金精矿,以提高金、银的回收率,减少废水、废渣的排放。研究影响造锍熔炼过程中金、银走向和在冰铜中富集程度的因素,并调整造锍熔炼工艺指标,降低炉渣中有价元素的损失。     

Computational Thermodynamics Modeling of Minor Element Distributions During Copper Flash Converting

Continuous copper converting processes are replacing traditional Peirce-Smith converters because they overcome most of the difficulties associated with this old batch technology. Most notably, they offer much improved environmental control of emissions. The Kennecott-Outotec flash converting process is attractive because it decouples smelting and converting, as well as offers high levels of sulfur capture. The success of a copper smelter depends on the way it controls the many minor elements that enter with the concentrate feed, and an understanding of the factors that control minor element distributions is essential. In this work, a computational thermodynamics model of the flash converter was developed and validated against published performance data. It was then used to predict the distribution behavior of lead, arsenic, bismuth, and cadmium, and the results matched the published data closely. It is suggested that the flash converter can be considered to approximate an equilibrium reactor and that minor elements distribute between the phases in a way that depends mostly on their thermodynamic properties.     

氰化金泥低温焙烧预处理—全湿法多金属冶炼工艺研究与应用

该工艺是在有色金属冶金的基础上 ,首创低温焙烧预处理全湿法多金属冶炼工艺 ,成功地实现了贵贱金属的分离 ,直接生产出高质量的金、银锭 ,纯度在 99 9%以上。金、银的综合回收率达到 99 95%以上 ,同时 ,能生产出铜、铅等金属 ,而且具有投资少、成本低的特点。     

火试金法测定铜冶炼物料中银补正系数研究

火试金法是分析化学中的一种经典的分析方法,对于熔炼和灰吹过程中产生的银损失,标准分析方法中采用二次试金或三次试金进行补正,虽然校正结果很好,但存在分析流程长、操作成本高、人为操作误差增加等问题.本文通过对铜冶炼中铜精矿、金精矿、粗铜、铜阳极泥等物料进行分类实验,统计分析了大量的实验数据,分别用一次试金法和二次试金法计算...     

冶炼炉渣中有价金属回收工艺研究和应用实践

本文介绍贵冶渣选车间通过对综合回收铜冶炼炉渣的工业研究及应用实践,实现了闪速炼铜炉渣中的铜的高效回收,以及炉渣中金、银等有价金属的富集,使铜、金、银的综合回收技术处于国内领先水平,创造了较好的经济和社会效益,提高了资源利用率,实现了渣选生产效益最大化,取得了循环经济的新突破。     

铜浮渣苏打——铅精矿熔炼新工艺研究

针对某冶炼厂生产浮渣含硫低、含铜高的特点,提出了苏打—铅精矿反射炉熔炼新工艺。结果表明:铅、金、银直收率分别提高了10.75、19.86和12.82个百分点;冰铜含铜达28%以上;砷铜铅合金产量明显减少;炉子操作条件得到了改善。     

银电解精炼生产及设备优化实践

紫金铜业有限公司稀贵厂阳极泥处理采用酸浸氧化脱铜—奥图泰卡尔多炉粗炼—银电解精炼—金精炼工艺。设计年处理量2 000t铜阳极泥,白银年产量176t,黄金年产量4.8t。从银电解精炼工艺、设备应用等方面分析生产前期出现的问题,并通过工艺调整、设备优化改造两方面对银电解精炼作业进行优化,使银电解精炼稳定产出合格的银粉。     

广东某含铜炉渣浮选试验研究

针对广东某铜冶炼转炉渣进行了工艺矿物学及选矿试验研究,工艺矿物学显示该矿物中铜品位1.13%,脉石矿物主要为铁橄榄石等。该炉渣采用阶磨阶选工艺流程,在一段磨矿细度-74μm67.5%,快速浮选得到部分精矿,尾矿再磨细度-43μm94.9%条件下,可获得铜精矿品位20.05%(金3.85g/t、银202.5g/t),铜回收率76.85%(金58.71%、银78.45%)的浮选技术指标,同时,尾矿铜品位降到了0.27%,炉渣样中的铜资源得到了有效的综合利用。     

碘量法测定铜冶炼分银渣中铜

铜冶炼分银渣中含有较高含量的砷、锑、锡等元素,对碘量法测铜产生干扰,并且样品较难溶解完全.实验采用盐酸-硝酸-高氯酸-硫酸分解样品,用氢溴酸除去砷、锑、锡等干扰元素.控制溶液pH值为3～4,用氟化氢铵掩蔽铁,加入碘化钾与铜(Ⅱ)作用,析出的碘以淀粉为指示剂,用硫代硫酸钠标准滴定溶液滴定,建立了硫代硫酸钠碘量法测定铜冶炼...     

碘量法测定铜阳极泥中铜的方法改进

使用行业标准方法 YS/T 745.1—2010碘量法测定铜阳极泥中铜时,采用氢溴酸除去试样中硒、砷、锑、锡等干扰元素,溶样过程操作繁琐,耗时长,易发生溅跳而造成无效结果,且检测效率低,因此不适用于冶炼企业大批量样品同时快速分析检测。试验使用盐酸分解试样,用硝硫混酸初步除硒等杂质、再用溴进一步除杂,替代氢溴酸除去试样中的杂质元素,从而对YS/T 745.1—2010碘量法测定铜阳极泥中铜的方法进行了改进。通过试验确定硝硫混酸用量为15mL,而后加入3mL盐酸溶解至溶液体积剩余约0.5mL时能完全溶解盐类。按照实验方法测定铜阳极泥试样中铜,测定结果的相对标准偏差(RSD,n=7)小于0.50%;各试样测定结果与行业标准方法 YS/T 745.1—2010结果一致,且两种方法间不存在显著性差异,可用于冶炼企业大批量快速分析检测铜阳极泥中铜量。