共查询到19条相似文献,搜索用时 500 毫秒
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以含锰为17.3%的菱锰矿矿石为原料,通过在硫酸介质中加入草酸、草酸铵、柠檬酸、柠檬酸铵、十二烷基硫酸钠(SDS)和十六烷基三甲基溴化铵(CTAB)等浸取添加剂从低品位菱锰矿中浸出锰,考察了添加剂用量、浸取温度和酸矿比等因素对低品位菱锰矿中锰浸出率的影响。试验结果表明:六种添加剂均能提高锰矿石中锰的浸出率,与同等条件下不加入添加剂时相比提高约2%-5%;其中十六烷基三甲基溴化铵(CTAB)对锰浸出率影响最大,当浸出50g原矿,CTAB用量为0.03g、酸矿比为0.70、液固比为8:1mL/g、反应时间为4h、浸出温度60℃时,锰的浸出率可达98%以上。 相似文献
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以铁尾矿为原料,研究了矿中SiO2的NaOH浸出过程,确定了铁尾矿用碱(NaOH)浸出过程中,影响SiO2浸出率的主要因素为:铁尾矿和NaOH与水的固液比,浸出反应温度,浸出反应时间.以此为条件,研究了铁尾矿在碱溶液中浸取SiO2反应的动力学行为.结果表明:铁尾矿中SiO2浸出的最佳因素为,固液比1:2,反应温度110℃,反应时间6h.SiO2的浸出动力学过程可用界面反应模型来描述,其浸出反应动力学方程为1-(3-x)2/3+2(1-X)=k2t,表观活化能约为14.2kJ/mol,属于固体内扩散控制. 相似文献
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闪速炼铜转炉渣浮选尾矿综合利用的研究 总被引:4,自引:0,他引:4
采用浸出-萃取-电积工艺对闪速炼铜转炉渣浮选尾矿(简称尾矿)进行综合利用研究。研究结果表明:选用低酸、加添加剂A进行搅拌浸出,铜的浸出率为60.35%,浸出过程尾矿中的铁不进入溶液而留于浸出渣中,浸出渣含铜由原尾矿中的0.63%降至0.24%,基本符合炼铁对铁精矿的原料中铜含量的要求,浸出渣可作铁精矿的原料出售而增值;含铜浸出液经萃取、电积回收铜,铜回收率接近60%,产品阴极铜质量符合国家1^#铜标准。 相似文献
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为实现石煤与软锰矿焙烧样中钒锰的共提取,并解决石煤二段硫酸化焙烧过程中酸过量的问题,通过多因素研究探讨石煤与低品位软锰矿焙烧样耦合浸出工艺对钒锰共浸出率的影响,为石煤及低品位软锰矿焙烧样中钒锰资源高效综合利用提供了参考和依据。试验结果表明,当石煤与低品位软锰矿焙烧样的配矿比为1:1、矿浆液固比为5:1及浸出温度为80℃时,耦合浸出体系中钒的浸出率可达98.13%,而锰的浸出率可达99.45%。对耦合浸出体系的钒锰浸出动力学研究表明,钒浸出过程是通过固体产物层的内扩散控制,其表观活化能为22.401kJ/mol;锰浸出过程在低温区25~55℃下是通过化学反应控制,其表观活化能为57.232kJ/mol,高温区65~95℃下锰浸出过程是通过固体产物层的内扩散控制,其表观活化能为14.323kJ/mol。 相似文献
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二氧化硫还原法处理银锰矿的研究 总被引:17,自引:6,他引:11
应用SO2直接还原氧化锰新工艺处理银锰矿石,解决了银锰分离的问题。当浸出条件为:矿石粒度—100目占80%,液固比2,温度70℃,硫酸浓度22g/LSO2气流量725ml/min·kg矿石(气压10132.5Pa),反应时间2h时,锰浸出率可达99.6%,银损失率0.12%。浸锰渣采用氰化法提银,银浸出率96.9%。SO2浸锰──氰化二步浸出银的浸出回收率96.8%。 相似文献
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菱锰矿常温浸出法及其动力学研究 总被引:2,自引:0,他引:2
文章介绍了采用催化剂PL来加快贫锰矿侵出速度的实验。由于催化剂的作用,使得菱锰矿的常温浸出得以实施。文章同时研究了锰矿的催化浸出行为,可以在下述条件下得到95%以上的锰浸出率:温度5-30℃矿粉粒度<0.25mm;搅拌转速>960r/min 相似文献
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针对印度尼西亚某低品位锰矿,提出盐酸法富集与酸介质高值再生的工艺。借助X射线衍射分析,光学显微镜和电子显微镜等表征方法进行工艺矿物学分析。结果表明:该锰矿矿物组成简单,主要由方解石、软锰矿和少量菱锰矿、褐铁矿、高岭石等组成。筛析结果显示该锰矿粒度越小,锰含量相对越高。粗碎后以2 mm筛孔的筛子过筛可得到锰质量分数为33.32%的锰中矿。锰中矿盐酸直接浸出的最佳条件为:浸出pH 3.0、浸出时间1.5 h、搅拌转速200 r·min?1、液固比4∶1 mL·g?1,此条件下产出的锰精矿品位为54.50%,钙质量分数为0.57%。常温下盐酸再生可产出二水硫酸钙晶须,其长径比可达50以上。再生盐酸返回浸出锰中矿,产出的锰精矿品位为52.16%,钙质量分数为1.39%,验证了该工艺流程的可行性。X射线衍射分析、扫描电镜及能谱分析结果显示产出的锰精矿主要组成成分为软锰矿,杂质为少量褐铁矿、高岭石等。酸介质循环时杂质将逐渐积累,当镁离子质量浓度积累到96.74 g·L?1时,采用水解沉淀法进行除杂。 相似文献
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用XRD、SEM和化学分析等方法对2种回转窑工艺还原低品位软锰矿的产物进行表征,同时结合硫酸浸出试验,考察锰、铁和铝的浸出差异。结果表明:改进回转窑工艺的产品中锰的还原率可达到93%以上,原回转窑工艺锰的还原率为50%~90%。常温常压时在较佳浸出条件下,酸矿比0.55∶1、液固比5∶1、时间40 min、搅拌速度300 r/min,改进回转窑工艺使锰的浸出率达94.1%,高于原回转窑工艺的产品,而铁、铝的浸出率则相对较低,分别是33.6%和26.3%。将回转窑中的燃烧室和还原室分离有利于提高锰的还原率,改进回转窑工艺产品中锰、铁、铝的存在形态,而颗粒表面粗糙、带小孔有裂纹的形貌具有较大比表面积,有利于提高锰的浸出率。 相似文献
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G. Tiburcio Munive M.A. Encinas Romero A. Valenzuela Soto V. Vázquez Vázquez J. H. Coronado López 《Canadian Metallurgical Quarterly》2018,57(3):312-318
A novel process was used to extract manganese from minerals that are refractory to cyanidation and ammonium thiosulphate. These minerals, known as mangano-argentiferous compounds, are principally composed of manganese, silver, and iron and exhibit low recovery. The mineral of interest was obtained from the leaching tails procured in Monte del Favor, Hostotipaquillo, Jalisco, Mexico. The tailings were characterised by X-ray powder diffraction (XRD), atomic absorption, and energy dispersive X-ray spectroscopy (EDS) microanalysis. After mineralogical characterisation, the tailings were screened through a mesh (mesh number 100, 0.147?mm); later, they were subjected to a reductive leaching process, where the solid–liquid ratio was varied from 2:1 to 10:1. A 5:1 ratio yielded the highest manganese content. With sulphuric acid and sodium sulphite as the reducing agents, 96.05% of Mn could be extracted during the first 3?h, with a head grade of 3.58% and an acid consumption of 49.31?kg/t. The sulphite consumption was found to be 9.81?kg/t. 相似文献
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Ahmet Ekmekyapar Celal Asin Nizamettin Demirkiran Asim Künkül Ahmet Baysar Kadim Ceylan 《Russian Journal of Non-Ferrous Metals》2012,53(3):211-217
Manganese compounds, such as manganese sulfate, can be obtained from pyrolusite, a manganese ore. Low-grade manganese ores is usually treated by hydrometallurgical methods. In this study, the leaching and recovery of manganese from pyrolusite ore in sulfuric acid solutions containing sawdust as reducing agent was investigated. The effects of experimental parameters, such as sulfuric acid concentration, sawdust amount, solid-to-liquid ratio, stirring speed, particle size, reaction temperature, and leaching time, on the manganese extraction from ore were examined. The results showed that the leaching rate of pyrolusite ore increased with an increasing sulfuric acid concentration, sawdust amount, stirring speed, reaction temperature and leaching time, and decreasing in solid to liquid ratio and particle size. The kinetic analysis of leaching process was carried out, and it was determined that the reaction rate was controlled by diffusion through the product layer under the experimental conditions in this work. The activation energy was found to be 22.35 kJ mol?1. Manganese can be recovered as manganese sulfate by the evaporative crystallization of the purified leach liquor. 相似文献
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D. Hariprasad M. K. Ghosh S. Anand 《Transactions of the Indian Institute of Metals》2009,62(6):551-554
In the present investigation results on the use of dried leaves as a reductant for manganese ore leaching is reported. A complete
flow-sheet consisting of steps such as reductive acid leaching, enrichment of leach solution by recycling, iron removal and
crystallization has been developed for the preparation of manganese sulphate monohydrate from manganese ore of Gujarat Mineral
Development Corporation (GMDC), Ahmedabad, India. During leaching effects of pulp density, amount of acid, temperature, particle
size of ore and reductant to ore ratio were studied. Almost total manganese extraction could be achieved under the following
conditions: leaching time 8h, H2SO4 5% (v/v), pulp density 10% (w/v), temperature 950C and dried leaves to ore ratio 0.5. Mn enriched (> 90 g/L Mn) leach liquor
was obtained by recycling the leach solution twice. The solution so obtained was purified by pH adjustment using lime slurry.
A schematic flowsheet for the preparation of manganese sulphate monohydrate crystal is given. 相似文献
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采用环保型非氰浸金剂,结合全泥炭浆法浸出工艺,对甘肃某金矿的浸金工艺进行了研究。具体考察了溶氧量、矿浆浓度、pH值、矿物粒度、浸金剂用量、浸出温度和浸出时间对金浸出效果的影响,采用原子吸收分光光度计测定原矿和尾矿中的金含量,通过计算金浸出率来确定适宜的浸金工艺条件。结果表明:综合考虑经济和浸出率等因素,在矿浆浓度为40%、pH=11~12、浸金剂用量为300 g/t矿样、浸出温度为20~40 ℃及浸金时间为24 h的条件下,用自来水作溶剂在敞开环境下浸金,浸出效率最佳,金的浸出率可达80%。 相似文献
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氧化型锰银矿其锰、银分离是处理这类资源的关键工序。试验分别采用煤焙烧、植物副产湿法还原工艺对锰银精矿进行了锰、银分离工艺性能的对比研究。在相同酸消耗情况下,植物副产湿法浸出的锰浸出率接近煤焙烧浸出,而银在浸锰液中溶出率远低于煤焙烧浸出;以玉米秸杆粉还原分离为代表,其浸锰条件选择在L/D=4、n(酸)/n(Mn)=1.76、秸杆/矿粉质量比=0.275、95℃浸出时间4 h时,锰浸出率达97.30%,浸锰渣量少;玉米秸杆粉浸锰渣在NaCN用量5 kg/t渣、常温浸银6 h时,Ag的浸出率为97.77%;并对其它植物副产还原浸出锰性能进行了验证试验。所研究工艺在锰、银分离综合成本方面具有较好的优势。 相似文献
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在硫酸溶液中,以SO_2为还原剂对氧化锰尾矿进行还原浸出,浸出液净化后与碳酸氢铵发生沉淀反应回收碳酸锰。在最优浸出条件下,锰浸出率达96%以上。采用氨水调节pH为5.2时,浸出液中的铁、铝、硅的去除率分别为100%、99.6%和96.9%。净化液与碳酸氢铵反应沉淀率为99.8%,整个工艺锰回收率为90.5%,碳酸锰产品达到《HG/T4203-2011工业碳酸锰》一等品指标要求。 相似文献