低品位硫矿石利用扩建项目增量内部收益率问题及分析

某矿山低品位硫矿石利用扩建项目经济评价,根据"有项目""无项目"评价体系,采用增量内部收益率和增量项目净现值指标进行评价分析,通过计算2个指标的评价结论截然相反。分析发现矿山作为资源项目具有不可再生性和耗竭性,可采资源是恒定的,导致"有项目""无项目"时计算期不同,出现多个内部收益率,指标无参考意义。通过对项目效益和费用进行统计分析,对矿山原有的剥离、建筑构筑物、总图等工程根据一定的比例按利旧处理,与新增投资一起计入投资费用,按新建项目体系进行经济评价,认为是一种比较好的处理方式,满足评价体系要求。

广东某含硫铁低品位铜矿石选矿工艺研究

广东某含硫铁低品位铜矿石主要有用元素铜、硫、铁品位分别为0.51%、27.68%、34.07%。铜赋存状态复杂,以次生硫化铜形式存在的铜占总铜的54.91%,水溶性铜占总铜的26.39%,采用常规浮选方法选别铜回收率低。为探索该矿石中铜、硫、铁的高效分选工艺,对其进行了选冶工艺研究。结果表明:原矿磨细至-0.074 mm占72%时,采用p H=3的硫酸溶液为浸出剂,在液固比为4 m L/g、搅拌转速为1 400 r/min、浸出时间为24 h条件下浸铜,可以获得铜浸出率为93.33%的指标;铜浸渣经自来水搅拌洗涤至p H=6以后,以丁黄药为捕收剂、2号油为起泡剂,经1粗1扫硫浮选,可获得硫品位为48.44%、对铜浸渣回收率为95.57%的高品质硫精矿;浮硫尾矿在磁介质为2mm棒介质、脉动冲程为16 mm、冲次为280次/min、背景磁感应强度为0.6 T条件下,经1次高梯度强磁选选铁,可获得铁品位为51.42%、对铜浸渣回收率为17.02%的铁精矿。以上试验结果说明,采用铜浸出—硫浮选—铁磁选的工艺流程可以实现矿石中铜硫铁的有效分离。

云南某低品位硫-氧混合型铜矿石浮选试验

云南某铜矿石属典型的低品位、高氧化率硫-氧混合型铜矿石,含铜0.33%,其中硫化铜占有率为49.09%,氧化铜占有率为50.91%。为确定该矿石的开发利用工艺,进行了选矿试验研究。结果表明,在磨矿细度为-0.074 mm占86.40%的情况下,采用1粗3精1扫流程浮选硫化铜矿物、1粗3精1扫流程浮选氧化铜矿物,可获得铜品位18.58%、回收率77.55%、金品位4.23 g/t的铜精矿。试验指标良好,实现了低品位硫-氧混合型铜矿石中铜、金的高效综合回收,可作为该矿石开发利用工艺设计的依据。

从河口铜矿石中回收铜铁硫的选矿试验

云南河口铜矿石含Cu 0.59%、S 4.57%、Fe 26.98%,属伴生硫铁的低品位硫化铜矿石,铜、硫、铁在矿石中分别主要以黄铜矿、黄铁矿、磁铁矿形式存在,但有少部分黄铜矿与黄铁矿形成固熔体。采用铜硫混合浮选—铜硫分离浮选—浮选尾矿弱磁选工艺对该矿石进行综合回收铜、硫、铁的选矿试验,得到了铜品位为18.03%、铜回收率为93.07%的铜精矿,硫品位为52.02%、硫回收率为56.34%的硫精矿和铁品位为61.90%、铁回收率为27.38%的铁精矿,从而为该矿石的合理开发利用提供了技术依据。

Recovery of Zn, Pb, Fe and Si from a low-grade mining ore by sulfidation roasting-beneficiation-leaching processes

To recover Zn, Pb, Fe and Si from a low-grade mining ore in the Lanping basin, Yunnan Province, China, a novel technology using the roasting with pyrite and carbon followed by beneficiation and hydrochloric acid leaching was proposed. Firstly, several factors such as pyrite dosage, roasting temperature, carbon powder dosage, holding time and particle size affecting on the flotation performance of Zn(Pb) and magnetic separation performance of Fe were simultaneously examined and the optimum process parameters were determined. A flotation concentrate, containing 17.46% Zn and 3.93% Pb, was obtained, and the Zn and Pb recoveries were 86.04% and 69.08%, respectively. The obtained flotation tailing was concentrated by a low-intensity magnetic separator. The grade of iron increased from 5.45% to 43.45% and the recovery of iron reached 64.87%. Hydrochloric acid leaching was then carried out for the magnetic separation tailing and a raw quartz concentrate containing 81.05% SiO2 was obtained. To further interpret the sulfidation mechanism of smithsonite, surface morphology and component of the sample before and after reactions were characterized by XRD and EPMA-EDS. The aim was to achieve the comprehensive utilization of the low-grade mining ore.

Leaching kinetics of low-grade copper ore with high-alkality gangues in ammonia-ammonium sulphate solution

The leaching kinetics of low-grade copper ore with high-alkality gangues was studied in ammonia-ammonium sulphate solution.The main parameters,such as ammonia and ammonium sulphate concentrations,particle size,solid-to-liquid ratio and reaction temperature,were chosen in the experiments.The results show that the increase of temperature,concentrations of ammonia and ammonium sulphate is propitious to the leaching rate of copper ore.The leaching rate increases with the decrease of particle size and solid-to-liquid ratio.The leaching rate is controlled by the diffusion through the ash layer and the activation energy is determined to be 25.54 kJ/mol.A semi-empirical equation was proposed to describe the leaching kinetics.

米拉多铜矿选矿生产实践

为了提高米拉多铜矿的生产效率,针对铜精矿品位和回收率低、选矿指标波动大等问题,在工艺矿物学研究的基础上,对选厂药剂制度、选矿设备球磨机及浮选柱参数进行了优化试验研究。研究结果表明:采用铜硫混合浮选、粗精矿再磨再选工艺流程回收铜矿物,以黄药、Z-200为捕收剂,F-501、IBC为起泡剂,当球磨机充填率达26%,磨矿细度-0.045 mm90.0%,浮选柱充气量160~190 m^(3)/h、淋洗水量50 m^(3)/h时,可获得铜品位27%、铜回收率90%以上的铜精矿,达到了较好的选矿指标,可为选矿厂生产提供技术依据。

Ammonium Thiosulfate Ecological Viable Alternative to Replace Sodium Cyanide in Gold and Silver Dissolution Ores

The southern region of the state of Chihuahua is mining by origin, as this has been proved ghost towns of Minas Nuevas, it is also called Villa Escobedo, Emerald and Blue. Minerals are nonrenewable resources. There are only reserves and waste deposited in tailings ponds of low-rade precious metals （gold and silver）. A conventional method for recovering gold and silver ore is low-grade cyanidation and the solvent consider toxic and highly dangerous for the flora, fauna, humans and the environment. The mechanism of cyanide poisoning is inhibition of cytochrome oxidase--an enzyme needed for cell respiration. Without compromising efficiency, sensitivity and cost of the process, the toxic solvent is replaced by a less aggressive one, which helps the environment, public and occupational health. （NH4）2S203 has no appreciable damage to conservative amounts, is a selective aqueous solvent for leaching gold and silver, easy to get and manipulate. This work is done in the Technological Institute of Parral in a low-grade ore from the southern region of the state of Chihuahua. This document has been enriched presented in the IMEC 2014, with the increase of series Ⅴ and Ⅵ.