一种独特的生物浸出系统的工业实践

Ruan Renman等人在《Hydrometallurgy》2011年108卷（1／2）期上撰文，介绍中国紫金山铜矿处理次生硫化铜矿的生物堆浸的成功实践。

提高加压浸出系统镍直收率工艺优化研究与应用

某加压浸出系统原设计处理原料为非金属化高镍原料,原料粒度为5~10mm,原料密度为6.5t/m^(2),由于市场原料供应变化,与原设计物料不同物理、化学性质的原料进入生产体系,产生了加压釜作业率低、系统Cu^(2+)/Cu^(+)平衡失衡等现象,导致加压浸出系统镍直收率偏低,影响了加压浸出系统生产运行连续性和经济性。针对不同原料的物理、化学性质,通过优化加压浸出系统生产工艺技术条件以及加压浸出系统设备设施技术改造,实现了加压浸出系统镍直收率稳步提升。

危险废物在填埋场中的浸出规律模拟实验方法研究

应用数学模型对危险物质的非饱水浸出机理进行了分析,并建立小柱非饱水模拟浸出实验系统,对危险废物在填埋场中的浸出规律进行了实验研究.结果表明,小柱模拟实验系统能较真实地反映实际填埋场中危险组分在填埋场中的迁移和浸出规律,该系统的建立为我国危险废物填埋场的设计、施工及填埋场的安全评价具有指导意义.

降低浸出车间尾气中溶剂含量的方法

为了降低浸出车间溶剂消耗 ,介绍了一种集冷却、冷冻、水喷淋吸收和料坯吸附于一体的从自由气体中回收溶剂的方法 ,结合水环式真空泵强制抽吸浸出系统的自由气体 ,使整个浸出系统处于微负压工作状态 。

浸出油厂节能降耗可能性和实施办法

结合生产实际和油脂科技最新发展,衣文提出浸出油厂节能降耗可能性和解决方案。

四方金矿选矿工艺技术改造与生产实践

针对四方金矿选矿厂工艺流程中存在的问题进行了分析与研究,并在现有条件下对其进行技术改造。通过对碎磨系统和浸出系统的优化改造,金回收率提高了1.22%,处理矿量增加21 t/d,并降低了选矿生产成本和尾渣、尾液的指标,取得了良好的经济效益。

粗颗粒焙砂碱洗脱氯试验研究及工业应用

巴彦淖尔紫金有色金属有限公司由于本地锌精矿锌品位低,锌锭产能一直受到制约,为解决产量受限,公司外购粗颗粒焙砂,球磨后直接加入浸出系统,但粗颗粒焙砂含氯较高,而氯离子会对湿法系统造成严重影响。因此决定从源头利用碱洗脱氯,拟定了几种除氯方案,并进行了对比试验,试验结果表明NaOH调碱除氯效果最好,在液固比4∶1,pH=9左右,反应温度50℃,反应时间1.0 h的条件下,粗颗粒焙砂除氯效率可达到93%以上,满足公司湿法炼锌的要求。

株冶直接炼铅试车

株冶集团投资6．58亿元的Kivcet直接炼铅项目，备料、熔炼、精炼3个工序已按预定计划开展单台空载试运行。直接炼铅项目是株冶循环经济建设规划的重要一环，采用目前世界最为先进的基夫赛特直接炼铅工艺，其处理的主要原料为铅精矿，以及株冶另一循环经济项目——锌直接浸出系统产出的硫浮选精矿热滤渣和硫浮选尾矿。项目主要包括直接炼铅系统、烟气制酸系统和铅精炼系统。

Ultrasonic-assisted Oxidation Leaching of Nickel Sulfide Concentrate

The feasibility of oxidation leaching process of nickel from nickel sulfide ore and the form of different components in the lixivium has been studied at first. The method of leaching nickel sulfide concentration directly by oxidants with existence of ultrasonic has been advanced. The process of leaching nickel from nickel sulfide concentration by using the system of persulfate and silver has been determined. The influence of different factors on the leaching rates of nickel,such as with and without ultrasonic,the concentration of Na2S2O8,liquid-solid ratio and the concentration of AgNO3 have been explored. The results show that:(1) in the oxidative leaching system,nickel can be leached completely as Ni2+ or NiSO4(aq.) from nickel sulfide concentration in theory;(2) the nicopyrite can not exist steadily in the persulfate acid leaching system,but Ni2+can. Meanwhile,sulfur may be existed steadily in the leaching process;(3) nicopyrite with much lower electrostatic potential may be leached earlier than chalcopyrite and sideropyrite;and(4) the overall reaction rate of the leaching process can be enhanced with ultrasonic radiation,but it does not change the mechanism of leaching. The more oxidant concentration or higher liquid-solid ratio is,the higher leaching percentage of nickel. The leaching percentage of nickel can be increased significantly by adding a small amount of AgNO3 during the leaching processes. Under the same conditions,the higher concentration of AgNO3 is,the higher leaching yields of nickel will be obtained.

Valence variation of arsenic in bioleaching process of arsenic-bearing gold ore

The concentration and variational trend of As3 +and As 5+,the bacterial resistance for the As 3+and As 5+and converting conditions from As3 +to As 5+were analyzed.The additive was used to prompt the bacterial leaching efficiency by changing valence state of arsenic.The results show that the concentration of As 3+ is larger than that of As 5+ in the lag phase.The concentration of As 3+ decreases in the log phase,and is lower than that of As5 +.HQ-0211 typed bacteria express better resistance for As 3+and As 5+and remain growing when the concentrations of As3 +and As 5+are above 6.0 g/L and 12.0 g/L,respectively.It is found that Fe 3+cannot oxidize As3 +singly as strong oxidant in the leaching system,but can cooperate with pyrite or chalcopyrite to do that.The oxidation of As 3+ is prompted with addition of H2O2.The bacterial activity is improved in favor of bacterial leaching efficiency.NaClO restrains the bacterial growth to depress leaching efficiency because of the chloric compounds affecting bacterial activity.

Mathematical model for coupled reactive flow and solute transport during heap bioleaching of copper sulfide

Based on the momentum and mass conservation equations, a comprehensive model of heap bioleaching process is developed to investigate the interaction between chemical reactions, solution flow, gas flow, and solute transport within the leaching system. The governing equations are solved numerically using the COMSOL Multiphysics software for the coupled reactive flow and solute transport at micro-scale, meso-scale and macro-scale levels. At or near the surface of ore particle, the acid concentration is relatively higher than that in the central area, while the concentration gradient decreases after 72 d of leaching. The flow simulation between ore particles by combining X-ray CT technology shows that the highest velocity in narrow pore reaches 0.375 m/s. The air velocity within the dump shows that the velocity near the top and side surface is relatively high, which leads to the high oxygen concentration in that area. The coupled heat transfer and liquid flow process shows that the solution can act as an effective remover from the heap, dropping the highest temperature from 60 to 38 ℃. The reagent transfer coupled with solution flow is also analyzed. The results obtained allow us to obtain a better understanding of the fundamental physical phenomenon of the bioleaching process.

Extraction of metals from automotive shredder residue: Preliminary results of different leaching systems

The study is focused on the extraction of valuable metals from automotive shredder residue(ASR)by different leaching solutions.First,ASR samples were roasted at 600°C to simulate a thermal treatment processing.Distilled water,citric and sulphuric acid were preliminarily investigated,thus two further full factorial systems entailing H2SO4–H2O2and H2SO4–H2O2–Fe3+were tested.The preliminary experimental results showed that0.1 mol·L-1H2SO4solution extracted 100%of Cu,Fe and Zn,whereas citric acid leached 100%of Zn and Pb,59%of Fe and 62%of Cu;whereas,H2SO4–H2O2and H2SO4–H2O2–Fe3+(Fenton's)leaching media showed that Cu,Fe and Zn can be extracted simultaneously and completely from the ASR ashes before final disposal.

Thermodynamics of solubility of Cu_2(OH)_2CO_3 in ammonia-ammonium chloride-ethylenediamine(En)-water system

In order to decrease the evaporating rate of ammonia and increase the solubility of copper in the solution,ethylenediamine was added into the ammonia-ammonium chloride system to leach the copper-containing oxide ores.The thermodynamic model was constructed and the solubility of malachite Cu2(OH)2CO3 in the ammonia-ammonium chloride-ethylenediamine(En)-water system was calculated using the exponential computation method based on both mass balance and charge balance.It is found that the solubility of copper can be increased and the free ammonia concentration can be decreased by submitting partial ammonia with ethylenediamine.The lower free ammonia concentration in the solution is a guarantee to the lower evaporating rate of ammonia.The conditions of malachite Cu2(OH)2CO3 converting to atacamite Cu(OH)1.5Cl0.5 were also studied.A group of experiments were designed to validate the veracity of the results of the thermodynamic calculation.It is found that the thermodynamic model is reliable and it can guide the leaching process.

YWH系列引射直冷式尾气回收装置

该装置采用独特的引射器对尾气抽吸，不需尾气风机即可保证浸出系统的微负压状态，又有效地对尾气进行回收：使用冷冻剂对尾气进行直接喷淋，避免了尾气中水汽冷冻结冰现象；具有尾气回收彻底。大大降低溶剂消耗；结构紧凑、占地小，能耗低等特点。该设备用于回收浸出车间尾气中的溶剂。

新星旗下Hobart锌冶炼厂将进行技术改造

在从澳大利亚塔斯马尼亚政府处获得2100万美元的资金支持和帮助后，新星（Nyrstar）公司目前正在对其位于澳大利亚塔斯马尼亚的Risdon（Hobart）锌冶炼厂进行一系列的改造。据了解，Risdon（Hobart）锌冶炼厂的产能为28万吨佯。这些改造包括升级原矿处理设备，另外也在新建一个锌浸出系统，将允许Risdon（Hobart）锌冶炼厂能处理来自南澳大利亚PortPirie冶炼厂的氧化锌物料。