镍精矿脱水及深度干燥工艺技术的选择

从铜、镍精矿的特性，分析了金川公司闪速熔炼系统精矿脱水、干燥、储存、运输工序存在的问题，证明了系统出现湿精矿产量低，含水高，运输过程粘结设备严重，湿精矿储存生成硫酸盐和自然风干结块，破坏精矿粒级，闪速炉冰镍品位低，产率大，流程长，消耗大，维护量大，均与精矿制备工序的工艺技术不完全适宜镍精矿有关。     

闪速熔炼的铜精矿干燥技术

介绍了目前闪速熔炼生产中常用的铜精矿干燥技术,并给合应用状况,对2种干燥技术——气流干燥和蒸汽干燥进行了对比,结果表明,蒸汽干燥技术在设备投资、节能与环保方面有着明显的优势,具有推广价值。     

镍闪速熔炼气流干燥系统二氧化硫尾气治理实践

原金川镍闪速熔炼精矿干燥系统采用"三段式"气流干燥工艺,外排尾气二氧化硫浓度超标,采用钠碱法对尾气进行治理后,干燥尾气达标排放。     

贵冶三期蒸汽干燥铜精矿气流输送系统的改进

介绍贵冶三期工程在扩大生产能力的基础上，吸取二期工程的经验，采用上引式输送仓泵输送铜精矿的改进措施及效果。     

蒸气间接干燥铜精矿的选择与操作

自热熔练工艺对干铜精矿原料的需求,日益严格的环保法规以及减小熔炼操作成本的需求,共同促成了蒸气间接烘干技术的商业化.与传统方法相比.该技术性价比高,污染小.Kvaemer Eureka公司的铜精矿蒸气烘干机是一项已经过验证的技术,可以减少废气中夹带的粉尘,从而简化粉尘分离系统.基于KvaemerEureka在处理各种铜粉与其他类型粉末方面的长期经验,以及对于蒸气烘干操作中所遇问题的成因而非表面症状的透彻分析,本文将讨论使用本公司独特盘管式设计的蒸气烘干机所能带来的优势与可能发生的问题,并给出间接烘干技术评估与选择的最佳标准.     

碘量法测定铜精矿中的铜

国家标准方法中短碘量法测定铜精矿中的铜操作简单,对设备要求不高,应用广泛。实验对测定过程中的细节操作进行了考察,包括电炉温度、滴定时间、摇动方式、试剂加入时间等。在实验确定的最佳条件下,该方法测定结果的平均偏差为0. 002%,相对标准偏差为0. 166%,准确度和精密度良好。     

高氟铜精矿的处理

叙述了高氟铜精矿的来源及高氟烟气对制酸系统设备的影响,针对高氟铜精矿的组成特点,通过合理配料、废酸废水加入硫酸铝除氟、增设除氟设备等措施,保证了生产的正常进行。     

Selective dissolution of uranium from Olympic Dam copper concentrates

The copper flotation concentrates produced from the Olympic Dam deposit in South Australia often contain significant amounts of uranium. Previous work indicated that uranium could be removed from a chalcocite-bornite concentrate by reaction with sulphuric acid. Reactions with djurleite, roxbyite, bornite and chalcopyrite-rich concentrates that are representative of each of the major copper sulphides in the deposit have now shown that uranium can be selectively removed from all types of copper concentrate generated from the deposit.The selective dissolution of uranium from the copper concentrates was achieved in 24 h by reaction with sulphuric acid at 30–60 ° C in an inert atmosphere. Redox potentials during most reactions were 225–250 mV vs saturated calomel electrode. It is proposed that the redox potential of the suspensions was determined by the oxidation of the copper sulphides. The addition of an oxidant (ferric alum) to increase the redox potential increased the amount of copper that dissolved but did not significantly affect the uranium dissolution rate.Oxidation of uraninite in the copper concentrates was by reaction with iron(III) from the acid dissolution of hematite, the major gangue mineral in the concentrates. It is likely that fluoride ions, from the dissolution of fluorite in the concentrates, are also involved in reactions leading to the dissolution of the uranium. Copper dissolution occurred by reaction of the copper sulphides with iron(III) and by reaction of acid with products from the aerial oxidation of the concentrates during storage.     

Kinetics of leaching of copper concentrates by nitric acid

Based on the study of the kinetics of leaching of copper concentrates by nitric acid, the limiting stages, reaction rate constants, activation energies, and general and partial orders of reactions of the components involved have been determined. An effect of films of reaction products on the limiting stage of the leaching of sulfides by nitric acid has been revealed. It has been shown that in the case of high oxidation potentials no films of elementary sulfur and iron oxide are formed, and the rate of the process is controlled by external diffusion.     

高铜钼精矿湿法浸铜工艺试验研究

对某铜矿钼品位43.49%、含铜3.37%的钼精矿进行了湿法浸铜工艺试验。结果表明:酸浸除铜和化学氧化-酸浸除铜工艺,铜浸出率较低,钼损失率较高,未能提高钼精矿钼品位;CJ-1溶液除铜工艺铜浸出率高,钼损失率低,可达到提高钼精矿钼品位并降低含铜的目的。     

某铜铅混合精矿铜铅分离试验研究

针对某铜铅混合精矿的矿石性质,确定了采用混合精矿浓缩脱药后,以重铬酸钾和JY405作为铅的抑制剂进行抑铅选铜。经一次粗选、四次精选、一次扫选浮选工艺流程,获得了铜品位23.06%、含铅4.69%、铜回收率92.27%的铜精矿,铅品位71.36%、含铜0.42%、铅回收率98.59%的铅精矿。     

碘量法测定铜精矿中铜含量的空白试验探讨

通过干扰物质电极电位与E(I2/I-)相比较,将碘量法测铜含量标定空白误差的来源分为三个类型,分析了不同干扰类型对测试结果的影响,通过标定空白计算得出不同干扰类型对测试结果造成偏离的原因不仅与样品空白、标定空白有关,还与标定硫代硫酸钠标准滴定溶液所消耗的标液体积及样品滴定所消耗的标液体积有关。从标定空白误差的来源和标定空白计算两个角度探讨GB/T 3884.1-2000碘量法空白试验的局限性,仅扣除样品空白而不扣除标定空白不能有效消除干扰元素对测试结果的影响,而且测试结果既可能正偏也可能负偏。     

Hydrothermal purification and enrichment of Chilean copper concentrates. Part 2: The behavior of the bulk concentrates

The hydrothermal treatment of Chilean Codelco-type copper concentrates with copper sulfate solutions was investigated as a mean of removal of impurities and subsequent increase of the copper assay. The behavior of the mineral phases (digenite, chalcopyrite, covellite, bornite, pyrite and sphalerite) was similar to those obtained in previous works from pure mineral samples. An almost complete transformation of bornite, chalcopirite, covellite and sphalerite into Cu_2 ? xS phases was obtained at 225 °C–240 °C. The highest degree of elimination (around 80%) of impurities was in Zn, Cd, Tl and Bi. An intermediate elimination (40–70%) was achieved for Pb and Te, with only moderate elimination (20–40%) of Mo, Hg, Sb and As. Temperature was the variable having the greatest influence on the elimination of the impurities. A concentrate containing 33% Cu, 33% S, 22% Fe and 2% Zn was converted to a highly enriched concentrate containing 70% Cu, 19% S and 3% Fe. The advantages of a concentrate of this type would include: (1) raising by more than twice the smelting capacity due to the high copper content, (2) generation of a minimum amount of slag, (3) reduction by almost 50% in sulfur emissions, (4) substantial reduction of wastes containing hazardous metals and, finally (5), retention of the option to hydrometallurgical copper recovery since the neo-formed Cu_2 ? xS phases are more reactive than chalcopyrite to the chemical or biochemical leaching.