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.     

矿石的制粒堆浸

本文阐述了堆浸制粒新技术的发展历史和对开发利用低品位矿产资源的重大意义,列举了湖南某金旷粉矿制粒堆浸新工艺半工业试验研究,文中研究方法和所得结果对于类似矿山皆有推广实用价值。     

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。     

Electrochemical leaching of a silver arsenopyrite ore

A silver ore concentrate (≈50 mg/kg Ag) was studied to determine whether electrolytic treatment could be used to enhance silver extraction from the ore. The hydrometallurgical leach was carried out in a batch mode using hydrochloric acid. The ore was mechanically slurried in an electrochemical cell with graphite rod electrodes. A comparison of the extractions using acid, acid + chlorine or electrolytic means was made by measuring silver, iron and sulphur dissolved as a function of time, concentration and sparging gas. The results demonstrated that the electrolytic leach improved both the rate and extent of silver extraction over non-electrolytic leaches. Up to 57% silver extraction was obtained in a 3 hour period compared with 15 to 25% with acid or acid + chlorine leaches respectively. The rate of silver extraction at the end of the 3 hour period was also substantially higher. Under the same conditions only 9% of the iron was extracted from the ore.     

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.     

铁矿粉的烧结熔融特性及其评价方法

通过可视化高温实验装置观察了七种不同类型常用进口铁矿粉试样的熔化流动过程.在所测定的熔融曲线上定义了T₃₀、T₅₅、T_R以及S_R等表征其熔融特性的评价指标,并以此考察了不同类型铁矿粉的烧结熔融特性.研究结果表明:澳大利亚褐铁矿最容易产生液相,但其液相形成过程中温度区间窄,温控性差,安全性低;澳大利亚半褐铁矿在低温烧结条件下有效液相量不足,而温控性则略好于澳大利亚褐铁矿;澳大利亚、南非以及巴西南部的赤铁矿熔融特性较为适宜,但前者易形成液相而后两者温控性和安全性更好;巴西的南部精粉、北部赤铁矿在低温烧结下很难生成液相.通过对各种铁矿粉熔融特性的研究,提出了基于铁矿粉熔融特性的烧结优化配矿原则.     

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。     

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％。     

Batch and counter-current acid leaching of uranium ore

Counter-current HCl and H₂SO₄ leaches were conducted on low-grade (Quirke Mine) and highgrade complex (Midwest Lake) uranium ores with various oxidants (e.g. NaClO₃, Fe₂(SO₄)₃, FeCl₃, Cl₂, H₂SO₅, O₂, and O₃), in order to compare extraction efficiencies of U, Th, Ni As and Ra with batch leaches. Leach results indicate that uranium extraction is least affected by the kind of oxidant and type of leaching but counter-current leaching generally provides higher extractions of Ni, Ra and Th. These leach results also indicate that counter-current HCl leaching of the highgrade complex uranium ore followed by counter-current water washing of the leach residue might be a way of yielding tails with an environmentally acceptable level of radium.     

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%。     

混汞尾矿浸金实验研究

混汞尾矿直接用于制粒堆浸、金浸出率很低,只有54.7造被破坏,细敬金从矿物中暴露出来,金的浸出率有了很大的提高,可达83.8%。     

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％。     

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%。     

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。     

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。