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Many of the mining operations in Western Australia are located in arid and semiarid regions where there is a severe scarcity of freshwater. Most of the processing is carried out using ground water from paleochannels. Much of this ground water is very saline, with concentrations approaching saturation in many cases. The potential rates of evaporation in the region can be very high (over 3 m∕year). With careful management, tailings deposited subaereally in this region can achieve high strengths and densities due to evaporation. However, high salinity results in a severe reduction in the rate of evaporation from the tailings, thereby inhibiting consolidation due to evaporation. This paper presents the results of laboratory evaporation tests carried out to examine the mechanisms by which this reduction occurs. In these tests, all tailings samples with saline water formed salt crusts on the surfaces during evaporation, resulting in evaporation rates that were markedly low compared with those from equivalent freshwater tailings samples. This was the case even if the salinity was low. From measurements made on these samples, it is concluded that the most important mechanisms for reduction due to the salt crust are the increase in surface reflectivity and the increase in the surface resistance to moisture transfer. The vapor pressure reduction in the air due to the salinity of the tailings water is also a factor. 相似文献
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试验以江西某钨矿山的黑钨尾矿为研究对象,探索了磨矿细度,捕收剂种类及用量,活化剂用量,抑制剂种类和用量等试验条件对选别指标的影响.通过一系列浮选条件试验,最终将药剂种类及用量确定为:抑制剂水玻璃 1.5 kg/t,组合捕收剂 GYB+GYR 200 g/t+200 g/t,活化剂硝酸铅 500 g/t.经闭路流程试验,从低品位黑钨尾矿中,获得了 WO3 品位为 27.43 %,WO3 回收率为 53.76 %的黑钨精矿. 相似文献
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主要针对尾矿库尾矿回采问题进行探讨。分析尾矿回采的可行性,结合具体工程实例,确定回采方案;分析回采过程中坝体的安全,得出回采过程中需重点关注的问题;归纳出影响尾矿回采安全的主要因素;根据预测到的回采过程中的安全问题,从技术和管理两方面进行预防和处理。 相似文献
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《中国钨业》2017,(1)
根据尾矿库特点及选厂生产情况,总结归纳了尾矿堆存量调查主要方法、尾矿品位调查主要方法,分析了各类方法适用条件、优缺点。结合某钼钨型尾矿库实际情况开展了尾矿资源调查方法应用实践工作。在该案例中采用生产能力估算法、生产报表统计法、几何计算法等尾矿库调查方法测算某尾矿库堆存尾矿量,利用洛阳铲取样化验法对尾矿钨品位进行调查,最终核定该尾矿库截至2015年6月尾矿堆存总量为2 215.1万t,其中已回收白钨尾矿量为1 029.25万t;未回收白钨的尾矿量为1 185.85万t,钨品位为0.09%,钨金属量为10 618 t。尾矿库资源调查可为尾矿资源二次开发利用评估和方案设计等提供依据。 相似文献
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某铜浮选尾矿中回收白钨矿的选矿试验研究 总被引:1,自引:0,他引:1
为提高钨资源回收,针对某铜矿山含WO30.089%的铜浮选尾矿,采用“磁选预先脱出磁黄铁矿-硫化矿浮选-钨粗选-白钨加温精选”的工艺以及白钨矿捕收剂FW,进行了较为系统的选矿试验研究。研究表明,由于磁黄铁矿被强烈抑制,难以活化浮选,采用磁选工艺脱出磁黄铁矿是获得较高品质钨精矿的关键。试验分别考察了油酸、ZL、FW三种捕收剂对白钨矿浮选的影响,试验表明,白钨矿捕收剂FW有着较强的捕收能力和选择性。研究最终获得钨精矿含WO356.24%,回收率52.54%的试验指标。 相似文献
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上游法尾矿堆筑坝坝体沉积规律探讨 总被引:1,自引:0,他引:1
颜学军 《稀有金属与硬质合金》2008,36(2):54-58
针对我国冶金矿山中广泛采用上游法尾矿堆筑坝作为尾矿库堆坝形式的情况,阐述了尾矿的成因、其特殊的物理力学性质等,提出了尾矿排放方式对坝体沉积规律及坝体结构的影响,分析了尾矿排放的浓度、流速、流量、排放点位置等对形成沉积坝体的影响.指出在进行上游法尾矿堆筑坝设计时,需对相关因素加以充分考虑,以使沉积坝体成为颗粒级配良好的堆积体.同时提出,短时间内沉积体的充分固结足上游法尾矿堆筑坝坝体稳定的先决条件,合理配置排渗设施,加快沉积体的脱水固结,才能尽快提高沉积体的抗剪强度,并列举了两个佐证实例. 相似文献
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文章介绍了某选矿尾矿的工艺矿物学性质及可选性试验研究。根据试样性质,确定采用浮选除杂-长石、石英分离的工艺流程,获得了K2O品位为7.57%,Na2O含量为2.54%的长石精矿产品。 相似文献
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从铜尾矿中回收白钨的选矿试验研究 总被引:2,自引:0,他引:2
依据某矿山的矿石性质,进行了原矿化学分析与白钨矿单体解离度测定,测定该选铜尾矿含WO30.21%,S6.09%,试验研究以原矿工艺矿物学研究结果为基础,采用先脱硫再浮选的选矿工艺流程回收钨。试验结果表明:铜尾矿磨矿细度为-0.074 mm含量75%时,采用一次粗选、两次扫选、两次精选的浮选脱硫工艺流程,可获得含硫48.98%、回收率98.15%的硫精矿;选硫尾矿通过两次钨粗选,两次钨扫选,五次钨精选的闭路浮选流程获得含WO355.88%,WO3回收率为80.35%的白钨精矿。 相似文献
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黄金矿山尾砂的综合利用,不仅可减少对环境的污染,又可变废为定增加矿山的效益.结合几个矿山的生产实际,总结了目前砂金和岩金开来中尾砂综合利用的几种途径和技术.为黄金矿山尾矿的处理提供了有益借鉴. 相似文献
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以电流场作为核素迁移的载体,研究某铀尾矿中U、Th在0、0.5、1.0、1.5V/cm直流电场条件下的释放及迁移规律。结果表明,在添加电场时,铀元素的浸出量小于自然淋滤条件下的浸出量,但土壤对铀的释放能力明显提升,且电场强度越强,释放能力越强,而钍元素则受其影响不大。在0、0.5、1.0、1.5V/cm电场强度条件下铀元素的累积浸出量分别为1.439、1.285、1.474、1.795mg/L,说明电场强度对U的释放以及迁移有促进作用。铀元素在电场作用下的迁移规律和其他重金属元素的规律类似,都是阳极往阴极迁移,且电场强度越大,阳极附近富集的铀元素浓度越高。 相似文献
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某选铁尾矿回收铁的选矿工艺研究 总被引:1,自引:0,他引:1
某选铁尾矿含铁28.04%,该尾矿主要是选铁洗矿过程中的溢流部分,其粒度非常细。针对该尾矿特点,进行回收铁的试验研究。通过多方案的对比,最终采用矿浆分散-磁选-浮选的联合试验流程,其闭路试验可得到含铁58.77%的铁精矿,铁回收率68.58%,使该尾矿资源得以综合利用,提高了企业的经济和社会效益。 相似文献
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Ernest K. Yanful Ajay Verma Anthony G. Straatman 《Canadian Metallurgical Quarterly》2000,126(12):1157-1165
The use of shallow water covers (up to 2 m) to flood reactive sulfide mine tailings is a common method of reducing the environmental impact of mining. It relies on the low solubility and diffusivity of oxygen in water. In actual tailings ponds, however, wind-induced waves and turbulent mixing can lead to tailings resuspension and increased oxygen transfer. Laboratory experiments and numerical modeling were performed to examine the impact of resuspension on metal release from sulfide mine tailings, and to elucidate the nature of the flow field. The results indicated that resuspended tailings oxidized and released acidity and metals considerably more than tailings at rest. The oxidation and metal release rates increased with an increase in the degree of turbulence-induced mixing in the water cover. Computed wall shear stresses on the surface of the tailings ranged from 0.14 to 0.42 N∕m2, which were close to, but slightly above, the critical shear stresses of the tailings (0.12–0.17 N∕m2). The flow energy was found to be positively correlated to the cumulative release of metals (zinc, nickel, copper, and ferric iron) and sulfate. 相似文献