氧化铜矿石粒度对浸出效果的影响

介绍了氧化铜矿石的浸出过程及浸出数值模型,分析了矿石粒度对渗透性及浸出率的影响。氧化铜矿石的浸出过程主要受浸出剂与溶出物在矿石中的渗流与扩散速度的影响。粒度是决定矿石浸出率和浸出方式的关键因素。应根据矿石的粒级组成选择合理的浸出方式,以达到良好的浸出效果。     

某高砷难溶金矿石浸出特性试验研究

采用超细磨、边磨边浸和强化碱浸等工艺方法考察了某高砷型难溶金矿石的浸出特性。其结果表明,超细磨、边磨边浸和强化碱浸工艺均能有效提高金的浸出率。矿样超细磨至-37μm占99.7%时,金的氰化浸出率从23.7%提高到73.6%,金的非氰化浸出率从18.5%提高到66.9%;在同样磨矿细度条件下进行边磨边浸,而后再继续浸出,金的氰化浸出率进一步提高到82.4%,金的非氰化浸出率提高到72.9%;在同样磨矿细度条件下进行碱浸预处理,碱浸6~9 h金的氰化浸出率为88.3%~87.5%,碱浸9~12 h金的非氰化浸出率为89.7%~90.2%。     

An investigation into the leaching kinetics of cobaltite ore with ferric sulfate solutions

A method for the extraction of cobalt from cobalt-arsenic-sulfide (cobaltite) ores or concentrates has been identified. The method utilizes an atmospheric oxygen-acidic ferric sulfate leach, at temperatures up to 373 K (100°C), to place the cobalt in solution. Extraction of 80 pct of the cobalt was obtained within 24 h and the tests indicate that greater and more rapid extractions are possible. Experiments were performed to assess the effects of temperature, ferric concentration, acid concentration, particle size, oxygen addition, and silver addition on the kinetics of cobaltite and chalcopyrite dissolution. formerly Graduate Student, University of Idaho     

Mineral properties and leaching characteristics of volcanic weathered crust elution-deposited rare earth ore

Weathered crust elution-deposited rare earth ore is an important resource of rare earths, including grantic weathered crust elution-deposited rare earth ore and volcanic weathered crust elution-deposited rare earth ore. The development condition of the weathered crust, weathering degree and mineral composition of these ores will be different because of the differences between their parent rocks and weathered crust causes of mineralogy path. Therefore, mineral properties and leaching characteristics of volcanic weathered crust elution-deposited rare earth ore from Chongzuo(CZ), Guangxi province were investigated. It was found that the CZ rare earth ore was a typical mid-yttrium and rich-europium ore, with the overall rare earth(REE) grade in ion-exchangeable phase of 0.15%. Partide size classification showed that finer particle had a higher REE grade. Column leaching tests showed that the leaching efficiency of REE was above 94% with leaching agent concentration of 0.20 mol/L, liquid-solid ratio of 4:3, flow rate of 0.60 mL/min, and initial pH value around 5.67. Compared to ammonium sulfate leaching, magnesium sulfate leaching was advantaged by nearly zero ammonia nitrogen emission while their REE leaching was almost equivalent.     

难选金矿石的细菌浸出

对金呈细粒浸染状嵌布的含砷、含铜难选金矿石进行了细菌脱砷、脱硫、脱铜的试验研究。生物浸渣由氰化或硫脲浸出，金的浸出率达８７％以上。研究了影响细菌生长、浸出的各种有关因素及由此引起的金属溶解现象，为细菌浸出在工业上应用提供了技术参考。     

硫脲浸取某含金矿石的试验研究

对经过焙烧，且钴、铜、镍、钼、铋等有用元素基本已浸出的某含金多金属矿石浸渣，进行了硫脲浸金试验。试验结果表明。当硫脲用量为8kg／t，浓硫酸用量20L／t，浸出时间为4h，金的浸出率达90％以上。     

矽卡岩铁帽型金矿石堆浸提金工艺特性

采用低浓度NaCH、低pH值堆浸工艺条件,处理含铜、呈酸性的铁帽型金矿石,可降低NaCH和碱的消耗,同时也有利于炭吸附,可提高岩吸附率和载金炭品位。     

铀矿堆浸工艺参数的优化

针对南方某铀矿研究了矿堆高度、入堆矿石粒度、喷淋剂浓度、喷淋制度、喷淋强度等因素对堆浸效果的影响,确定了工业生产合理的工艺参数.     

铜锌混合矿加压浸出的试验研究

进行了铜锌混合矿加压浸出的试验研究,分析了氧分压、酸度、温度、反应时间、添加剂等因素对铜锌浸出率的影响。试验结果表明,在氧分压0.4MPa、酸度240g/L、温度140℃、浸出时间150min、添加剂用量0.10%￣0.22%的条件下浸出,铜、锌的浸出率均可达97%。     

铜锌混合矿加压浸出的试验研究

进行了铜锌混合矿加压浸出的试验研究，分析了氧分压、酸度、温度、反应时间、添加剂等因素对铜锌浸出率的影响。试验结果表明，在氧分压0.4MPa、酸度240g／L、温度140℃、浸出时间150min、添加剂用量0．10%-0．22％的条件下浸出，铜、锌的浸出率均可达97％。     

铁帽型金矿石制粒堆浸提金工艺的探讨

以一铁帽型金矿石的堆浸生产实践为例,结合其矿石性质,分析了铁帽型金矿石堆浸的可行, 探讨了堆浸时制粒与否,pH值,药剂制度和浸出时间等浸出因素对浸出效果的影响,以优化生产条件,生产实践表明,对于这类氧化程度高,含泥多的低品位铁帽型金矿石,采用制粒堆浸工艺,可以获得较好的技术指标,金浸出率达到77％。     

硫化铜矿的超声波强化浸出

为了解决硫化铜矿浸出速度慢、浸出率低等问题,通过研究硫化铜矿浸出反应过程,分析了影响浸出率的多种因素,表明矿石孔裂隙欠发育、钝化膜、化学沉淀是影响浸出效果的主要因素。从物理作用和化学作用两个方面探明了超声波强化硫化铜矿浸出的机理,并结合试验进行分析。结果表明:超声波可强化硫化铜矿的浸出,具有良好的应用前景。     

从钴铜矿浸出液中萃取-电积铜

介绍了用萃取-电积脱铜技术替代铁屑置换或碳酸钠中和沉淀,从氧化钴铜矿浸出液中脱除铜的生产实践及主要技术经济指标。     

浸矿对离子型稀土矿强度影响的试验研究

为研究浸矿对离子型稀土矿物理力学性质的影响,分别对浸矿前后的稀土矿样做直接剪切试验,根据库仑定律求出稀土矿的抗剪强度指标,结合颗粒筛分试验,分析浸矿对离子型稀土矿颗粒粒径和强度的影响规律,结果表明：浸矿发生的离子交换反应改变了离子型稀土矿颗粒的成分、粒径和级配,进而改变了稀土矿区的强度等力学性质;浸矿使稀土矿黏聚力降低50%左右,内摩擦角约增加15%,级配变差。本文的研究将为稀土开采中的边坡稳定和浸矿后尾矿的治理和综合利用提供一定的理论指导。     

从钴铜矿浸出液中萃取-电积铜

介绍了用萃取-电积脱铜技术替代铁屑置换或碳酸钠中和沉淀,从氧化钴铜矿浸出液中脱除铜的生产实践及主要技术经济指标。     

难浸金矿石的浸出与尾矿再回收试验研究

通过对难浸金矿石的氰化、浮选试验研究,确定出合理的工艺流程及条件,使难浸金矿石氰化浸出率达到87%以上;对氰化尾矿浮选,使金的氰化、浮选总回收率可达91.93%。     

低品位金矿浸出新工艺研究

本文研究了低品位金矿石的浸出方法。将矿石在700℃焙烧后,掺混一种添加剂,在盐酸溶液中进行搅拌浸出或渗滤浸出,其金的浸出率均大于90％。     

Studies on the leaching of an arsenic–uranium ore

Preliminary leaching studies were carried out to develop a suitable method for the recovery of uranium and the elimination of arsenic from a low grade carbonate/silicate ore containing 64 ppm U and 2446 ppm As, as well as some Cu, Pb, Ni and Zn. An examination of the mineralogy found mostly uranium(VI) minerals, such as uraninite, and various base metal sulfides and arsenates in veins and fissures. Roasting the ore at 500–800 °C to volatilize arsenic proved to be unsuitable. Therefore, the ground ore was subjected to direct leaching with sulfuric acid, sodium sulfide and ferric chloride at 80–90 °C with a liquid to solid ratio of 1:1. With sulfuric acid at a concentration of 180 kg/t ore, complete recovery of both uranium and arsenic was achieved giving undesirable arsenic in the leach liquor. The maximum recovery of uranium and arsenic by leaching with sodium sulfide was only 20% and 18%, respectively. However, 3 M ferric chloride leached approximately 92% U(VI) and precipitated arsenic as ferric arsenate. Therefore, maximum uranium can be extracted and arsenic eliminated as impurity by selective leaching with ferric chloride.     

含金褐铁矿直接堆浸的初步探讨

本文对吴家金矿含金褐铁矿石进行直接堆浸试验,取得较好指标(金浸出率达到75％)作了简要论述,并探讨了制粒堆浸失败的原因和多雨季节堆浸过程应注意的事项,为该地区泥质氧化矿石(铁帽型金矿)直接堆浸提供了成功的经验。     

红土镍矿加压浸出工艺残积型红土镍矿中和试验研究

残积型红土镍矿是一种重要的红土镍矿,镁元素含量较高(10％～27％),在红土镍矿加压浸出项目中,通常用来中和加压浸出的矿浆,矿浆中硫酸浓度通常为30 ～ 50 g/L.但残积矿用量对镍、钴浸出率有较大影响,为了更好地利用残积型红土镍矿,本文进行了常规浸出试验和还原浸出试验.试验结果表明:随着残积矿用量的增加(液固比降低...