从锌精矿焙烧电尘中提取镉

对从锌精矿焙烧电尘中回收镉的工艺进行了研究，比较了水浸、酸浸及氧化酸浸3种浸镉方法，指出氧化酸浸－除砷－置换－压团－熔铸是回收镉的最佳流程，用这种方法处理含镉电尘，镉的浸出率大于90％，粗镉品位99.10％。     

高残硫烟尘生产电锌并综合回收铅银镉的研究

对高残硫烟尘生产电锌并综合回收铅银镉进行了研究,采用中浸-酸浸-水洗全湿法工艺,电积生产出100%零号锌,并综合回收铅、银、镉,解决了高残硫物料生产电锌的技术难题。     

用全湿法工艺处理红白镉尘的研究

处理红白镉尘的硫酸化焙烧一浸出工艺不仅环境污染严重,操作条件恶劣,而且造成设备腐蚀．我们研究了用中性浸出一氧化热酸浸出全湿法冶金工艺处理红白镉尘的方法,考察了氧化热酸浸出的工艺参数,在最佳条件下,锌、镉总浸出率均可达９５％左右．     

铜冶炼白烟尘综合回收研究

介绍了铜冶炼白烟尘在不同浸出体系下的浸出效果。结果表明,酸浸体系较水浸、碱浸体系效果更好。在H2SO4浓度2mol/L、液固比4:1、温度50℃、浸出时间2h、搅拌速度400r/min的最佳酸浸条件下,铜、锌、砷、镉和铁的浸出率分别为99.75%、99.81%、86.85%、95.85%和57.83%。采用铁粉置换-铁盐沉砷-中和沉锌镉的方法从酸浸液中回收Cu、As、Zn和Cd,在最优条件下,铜、砷、锌和镉回收率分别为99.70%、98.81%、99.47%和99.98%。     

催化氧化酸浸法处理锌精矿的研究

本文概述了催化氧化酶浸法处理硫化锌精矿的结果．采用催化氧化酸浸（100℃,400KPaA）－和氧化除铁－锌粉置换除铜镉－碳酸铵（或碳酸氢铵＋氨水）沉淀碱式碳酸锌的全湿法新工艺可生产一级减式碳酸锌,催化氧化酸浸之锌浸出率为95％．所得产品经新技术──等离子热分解可获得超细活性氧化锌。也可将所得硫酸锌溶液净化后用于锌电积,获得符合标准要求的电积锌。     

镉在铅烧结-鼓风炉熔炼过程中的行为、分布、危害及其回收

文章分析了镉在铅烧结-鼓风炉熔炼过程中的热力学行为,调研了镉在熔炼过程中的分布及其危害,用硫酸直接浸出法可从烧结电收尘中回收镉,实现镉的开路,减轻镉尘对环境的污染.     

载镉废啤酒酵母中金属镉的回收

以水洗废啤酒酵母为吸附剂,对废水中镉离子进行生物吸附及固液分离后,获得载镉废啤酒酵母。采用焙烧-酸浸-置换法回收"载镉菌体上的镉",在700℃焙烧24 h,菌渣中镉富集比为31.72,烧渣经15 g/L的硫酸、温度85℃条件下,浸出2 h,再用锌粒置换,得海绵镉,镉总回收率在98%以上。     

锌冶炼系统处理炼铅含镉烟尘的生产实践

介绍了铅精矿氧气底吹炉熔炼产出的含镉烟尘在锌冶炼系统回收镉的生产实践。含镉烟尘与回转窑烟尘一起稀酸浸出,酸浸渣送铅系统回收铅,酸浸液并入锌冶炼系统的焙砂浸出液,在锌冶炼系统采用常规工艺回收镉,产出镉锭。     

刚果(金)低品位氧化铜回收工艺研究

对刚果(金)某氧化铜堆存矿回收工艺试验研究表明,在样品含铜1.3%左右,且铜氧化率95%以上的情况下,原矿磨矿至-0.074 mm占65%左右,采用高梯度强磁选机磁选-磁选精矿常温酸浸工艺,获得铜品位8%以上、铜回收率74%以上的磁选精矿。磁选精矿采用硫酸常温浸出,在酸矿比0.15的条件下,铜的浸出率达93%以上,磁选抛尾率接近90%,相比原矿直接酸浸的酸矿比0.6,酸耗大幅降低。磁选-酸浸联合工艺,铜的综合收率达68%以上,实现了铜资源的有效回收与利用。     

溶浸、萃取、电积工艺在江西铜业公司的进展与展望

本文重点介绍了江西铜业公司低品位矿石、氧化矿等,采用溶浸、萃取、电积工艺回收金属的有关试验,生产实践等情况.包括废石堆的细菌浸出,氧化矿的酸浸和原生矿的就地溶浸、同时对存在的问题及发展方向提出了意见.     

从电尘中回收铊的工业试验

介绍了在电尘提镉工艺基础上回收铊的工业试验。采用的处理工艺简单,生产成本低,经济效益好,对环境污染小,可产出品位大于99.99%的金属铊。     

Recovery of metal values from copper smelter flue dust

A hydrometallurgical process has been developed for the recovery of valuable metals from the flue dust of a copper smelter. The dust containing various metals, such as lead, zinc, copper, bismuth, indium, cadmium, iron, arsenic etc., was treated using this hydrometallurgical process to recover all these metals and also to solve environmental pollution problems. Leachings were carried out under atmospheric and elevated pressure utilizing sulfuric acid. Sulfuric acid pressure leaching in the absence of oxygen provided the best separation of copper and arsenic. About 80% of arsenic went into solution during leaching, and more than 90% of copper remained in the residue as cupric sulfide. Zinc, cadmium and indium from the solution and bismuth, copper and lead from the residue were recovered by various well-known processes. Arsenic and iron were removed from the solution by oxidation and precipitation as ferric arsenate. Both laboratory and bench-scale experiments were carried out with satisfactory results.     

含砷烟尘的综合利用

采用氢氧化钠碱性浸出分离回收含砷烟尘中的砷,在优化试验条件下,砷、锑、铅的浸出率分别为99.27%、1.83%和0.20%;砷浸出液经氧化—冷却结晶回收砷酸钠后返回浸出过程循环利用,整个脱砷工艺闭路循环。采用硫化钠浸出—空气氧化法分离回收含砷烟尘碱浸渣中的锑并制备焦锑酸钠,碱浸渣中锑的浸出率为93.03%,锑浸出液中锑沉淀率为98.51%。采用硫酸浸出—铝板置换分离回收硫化钠浸出渣中的铟并制备海绵铟,铟的浸出率为71.83%。硫酸浸出渣中铅的主要以PbS的形式存在,可以作为铅冶炼的原料返回铅厂回收铅。     

从某低品位石煤钒矿中浸出钒的工艺研究

研究了从某低品位石煤钒矿中浸出钒,主要考察了硫酸直接浸出、氧化焙烧—酸浸、氧化焙烧—碱浸和钙化焙烧—碳酸钠浸出等工艺对钒浸出率的影响。结果表明:造球氧化焙烧—酸浸流程工艺指标较好;在焙烧温度850℃、焙烧时间2h、酸用量为矿石质量60%条件下浸出6h,五氧化二钒浸出率达62.5%。     

锌冶炼铜渣提取铜、锌、镉的试验研究

简述了二段氧化酸浸处理锌冶炼铜渣,生产硫酸铜、硫酸锌和海绵镉的试验研究。研究了液固比、温度和时间等因素对铜渣浸出效果的影响,并对酸化浸出过程进行了优化,在最优条件下铜、锌和镉的浸出率分别达到95.34%,98.57%,99.35%。     

Understanding Environmental Leachability of Electric Arc Furnace Dust

Dust from production of steel in an electric arc furnace (EAF) contains a mixture of elements that pose a challenge for both recovery and disposal. This paper relates the leachability of six Canadian EAF dusts in four leaching tests [distilled water, Ontario Regulation 347 Leachate Extraction Procedure, Amount Available for Leaching (AALT), and pH 5 Stat] to their mineralogy. Chromium and nickel contaminants in EAF dust are largely unleachable (<5% available in AALT and pH 5 Stat), as they are found with the predominant spinel ferrite phase in EAF dust. However, even a small proportion of oxidized chromium can result in significant leachate concentrations of highly toxic chromate. The leachability of zinc (7–50% available), lead (2–17% available), and cadmium (9–55% available) can be significant, as large fractions of these contaminants are found as chlorides and oxides. The leaching of these metals is largely controlled by pH. The acid neutralization capacity of the EAF dusts appeared to be controlled by dissolution of lime and zincite, and results from regulatory leaching tests can be misleading because the variable acid neutralization capacity of EAF dusts can lead to very different final leachate pHs (5–12.4). A more informative approach would be to evaluate the total amounts of contaminants available in the long term, and the acid neutralization capacity.     

从高氟氯烟尘中富集铟的研究

国内冶炼常规湿法流程锌浸出渣生产氧化锌脱氟氯时会产生大量的烟尘,其中含有锌、铅、铟、镉、氟、氯、砷等元素。研究了该烟尘富集铟、回收锌和铅以及处理氟、氯、砷等有害元素的工艺流程。结果表明,采取适当的工艺后可以回收烟尘中的有价金属。     

从含铜金精矿综合回收金银铜硫的湿法冶金工艺研究

对于含铜金精矿,为综合回收其中有价元素,经过多种湿法方案的比较,以热压浸铜-煤油溶解提硫-氰化提金工艺为优,金、银、铜和硫的回收率分别达到97.3 %、76.0 %、99.0 %和99.1 %。该工艺热压浸铜在110 ℃和0.45 MPa氧分压下操作,有价元素综合回收率高,易于工程实施,对环境污染小,是一种清洁的湿法冶金工艺。     

硫酸浸出瓦斯灰中铟的试验研究

理论上分析了从瓦斯灰中浸出铟的可行性。试验采用硫酸浸出瓦斯灰提取铟。结果表明,在初始硫酸浓度为1m／L,固液比1：5,浸出温度80℃,浸出时间2h,高速搅拌条件下,铟浸取回收率15．31％。