某褐铁矿强磁选-反浮选试验研究

根据某褐铁矿的矿石性质,采用一段磨矿、强磁选-反浮选工艺流程,对该矿石进行了选矿试验。试验结果表明,在磨矿细度-0.074 mm占60.0%,一次强磁粗选,强磁精矿再选,强磁尾矿再进行二次扫选,强磁精矿再选尾矿和强磁尾矿再选精矿合并进行反浮选,反浮选尾矿返回强磁尾矿再选的闭路工艺流程,可获得产率52.24%,品位54.04%,回收率67.03%的强磁精矿和产率47.76%,品位29.08%,回收率32.97%的最终尾矿。     

某鞍山式磁铁矿选厂尾矿再选试验研究

对某鞍山式磁铁矿选厂尾矿进行化学多元素、物相、粒度、单体解离度等分析,并进行强磁预富集条件、预富集精矿磨矿细度、磁场强度分选等试验,获得了适宜的尾矿再选流程、试验条件及良好的再选指标,并分析了再选流程对原尾矿中磁性铁的回收情况。     

弓长岭选矿厂重选尾矿再选工艺设计与论证

本文通过产品分析考查及再选试验结果，确定尾矿再选流程及指标，并进行流程计算，选择适宜设备，从而对尾矿再选工艺进行设计与论证。     

云浮硫铁矿降低尾矿品位的工艺分析

根据云浮广业硫铁矿的多次选矿试验结果,探索了在保证硫精矿品位的情况下提高硫回收率、降低尾矿硫品位的工艺措施.分别对优先浮碳、精选Ⅱ中矿再磨再选和尾矿再磨再选流程进行了试验,提出了中矿再磨再选的可行工艺方案.     

某低镁、高硅磷矿擦洗尾矿1.0t/d浮选试验研究

针对云南某低镁、高硅擦洗磷矿尾矿,进行1.0 t/d扩大浮选试验研究,对比研究了"粗选和精选尾矿合并再选"和"粗选和精选尾矿分开再选"两个工艺流程的选矿结果.结果表明,"粗选和精选尾矿分开再选"流程的选矿指标较好.原矿经"粗选和精选尾矿分开再选"流程浮选后所得精矿的P2O5品位为28.61％,回收率为71.92％,较"...     

浅析鞍山某矿区综合尾矿预选粗精矿精选试验

通过对鞍山某矿区综合尾矿预选混合粗精矿性质的分析和必要的实验室试验,进行了粗精矿混合再磨再选试验和粗精矿分别再磨再选试验两种方案对比,得出较理想指标。试验结果表明,采用"粗精矿分别再磨再选试验"对该矿区综合尾矿预选后的混合粗精矿进行精选,可实现螺精和永磁精分别磨矿、分别选别,使得磨矿更有针对性,且强磁通过量大幅减少。     

铜绿山矿尾矿再选铁工艺试验研究

介绍了铜绿山矿尾矿再选铁工艺流程,并进行了低品位尾矿再选工艺和弱磁性铁选别工艺的试验研究,并提出了看法。     

矿浆pH值对多宝山铜钼硫化矿尾矿再选影响的研究

多宝山铜矿是我国大型低品位铜钼矿山,为了进一步降低浮选尾矿品位、提高金属回收率设计了尾矿再选试验。实际生产中扫选矿浆pH值对比入浮矿浆下降0.3。为了提高尾矿再选的回收率,在尾矿再选过程中添加石灰,提高尾矿再选的矿浆pH值。以扫选最终尾矿为研究对象,通过添加石灰调节矿浆pH值,试验结果表明,当黄药用量20 g/t,尾矿再选矿浆pH值为10时,回收率取得最佳结果。只以丁基黄药作为捕收剂、pH值为10的条件下精矿品位对比入浮原样品位下降0.024个百分点。根据试验结果在生产现场扫三添加石灰,随着石灰用量的增加,矿浆pH值逐渐升高至入浮矿浆pH值,继续增加石灰用量,泡沫层厚度增加明显,流动性变差,尾矿指标变差。根据实际生产情况,当调整扫选pH值与入浮矿浆pH值基本保持一致时,扫选精矿产率对比未添加石灰提高0.95个百分点,扫三回收率提高3.02个百分点,最终尾矿品位降低0.002个百分点。试验结果与生产实践表明,提高扫选过程矿浆pH值有利于金属回收率的增加。     

广州云硫矿业尾矿技改项目设计与生产实践

介绍了广州云硫矿业尾矿的矿石特性和设计选用的尾矿再选流程。云硫矿业选矿厂尾矿再选技改项目的实施降低了原选矿厂的尾矿含硫量、减轻了尾矿库回水酸化的程度,减少了对环境造成的不良影响。尾矿再选技改项目实施后,从原选矿厂尾矿中提取硫精矿22万t/a,既减少硫资源的浪费、创造良好的经济价值,又减少尾矿排放量,延长尾矿库的服务年限。尾矿再选技改项目工艺流程选择合理,设备选型正确,选矿厂顺利达产达标。     

冯家峪铁矿尾矿再选生产实践

简介了尾矿再选试验，依据其试验结果，采用ＨＳ－１６００×８盘式磁选机直接从选矿厂尾矿中回收粗精矿，实现了对尾矿回收再利用。     

铜矿山老尾矿综合回收铜金银浮选技术研究

针对某铜矿尾矿库堆存的老尾矿铜氧化率高及部分硫化铜表面存在不同程度的氧化等特点,采用表面处理与活化及高效捕收剂浮选技术强化表面(半)氧化硫化铜浮选。闭路试验获得了铜品位12.02%、含金9.02 g/t、含银82.72 g/t、铜回收率51.22%、金回收率54.72%、银回收率23.87%的铜精矿。     

河南某铅锌尾矿回收白钨试验研究

河南某铅锌尾矿含WO30.2%左右,由于该老尾矿堆存时间长,导致尾矿中金属矿物大量胶结、氧化、钝化,致使该铅锌尾矿的回收在技术上存在很大困难.通过比较多种技术参数条件下的实验结果,选择最佳实验参数进行浮-重联合工艺闭路实验,实现了钨的回收,获得白钨精矿含WO342.10%、WO3回收率61.92%的较好指标.     

Electro-remediation of copper mine tailings. Comparing copper removal efficiencies for two tailings of different age

This work compares and evaluates the copper removal efficiency when applying electric fields to two mine tailings originating from the same mine but of different age. Eight experiments were carried out – four on tailings deposited more than 20 years ago (old tailings) and four on tailings deposited less than 2 years ago (new tailings). Parameters analyzed were the applied voltage drop, acid concentration during pretreatment, and the use of either passive or ion exchange membranes in the experimental setup.The comparison of the results confirms that there are differences in the electroremediation between the two tailings, even if the pH is similar and a mineralogical analysis showed similarities between the samples with respect to composition. It was found that an electroremediation is more favorable on the old tailings. The results showed that the best experimental conditions for both tailings is a pretreatment with H₂SO₄ 1 M followed by applying 40 V for 7 days, using ion exchange membranes. In this case 16.7% of copper was removed from the anode section for the old tailings, whereas only 11.2% was removed from the new tailings. The current efficiencies with respect to copper for the old and new tailings were 1.7% and 1.6%, respectively.     

某铜矿山老尾矿中铜的赋存状态研究

某铜矿山老尾矿含铜0.46%,为了查明铜的赋存状态,通过化学物相分析、X-射线衍射分析、光学显微镜、扫描电子显微镜及矿物自动分析仪(MLA)等,查明该尾矿中铜的赋存状态十分复杂,其中42.22%的铜以黄铜矿、辉铜矿等硫化铜形式存在,26.67%的铜以孔雀石、赤铜矿等氧化铜形式存在,还有31.11%的铜以吸附状态或微粒包裹体形式赋存于褐铁矿、硬锰矿及高岭石等黏土矿物中,研究结果给铜回收工艺的合理制定提供了基础数据。     

尾矿库坝体三维渗流场的数值模拟与试验分析

本文以云南某尾矿库工程为研究背景,针对尾矿坝稳定性日渐变差等问题,采用三维数值模拟、堆坝模型试验的浸润线分析结果和室内渗透系数试验等方法,根据室内土工实验的尾矿体渗透系数实验结果,参考国内外尾矿坝渗流计算的渗透系数经验值,考虑到尾矿坝中尾矿体的各向异性问题,选取合理的计算参数,分析尾矿库在不同工况下尾矿坝浸润线的埋深与变化规律,研究表明：试验结果与三维数值模拟计算结果较吻合,能够反映真实情况。     

絮凝剂和减水剂对尾砂浓密性能与充填体强度的影响

为提高溢流尾砂胶结充填效果,对溢流尾砂开展了添加和未添加减水剂沉降试验、湿堆密度测试、胶结料浆流变参数与抗压强度测试、胶结充填体总空隙率和微观结构测试,探究了絮凝剂与减水剂对溢流尾砂浓密性能和充填体强度的作用机理。研究表明：絮凝剂与减水剂具有“协同效应”,可提高尾砂浓密底流浓度,但效果与减水剂添加顺序和添加量相关。添加絮凝剂与减水剂使溢流尾砂湿堆密度增大,由0.559提高至0.591。絮凝剂添加使胶结充填体总空隙率与结构缺陷增加,造成充填体抗压强度降低;而含絮凝剂与减水剂的胶结充填体总空隙率降低,结构更致密,充填体抗压强度得到提高。尾砂浓密阶段添加减水剂可降低后续胶凝材料用量。相关研究成果可为优化尾砂高浓度胶结充填工艺提供借鉴。     

土工格栅加筋尾矿坝的界面力学特性研究

保证尾矿堆放场所的安全,对保护周边生态环境、确保周边人民人身与财产安全具有重要意义。为了给尾矿坝加筋处理选择更为合适的土工材料,选用Paragrid 单向聚酯纤维纤塑土工格栅、HDPE-TGDG100高密度聚乙烯土工格栅作为试验土工材料,研究了两者与尾矿坝的界面力学特性,并设计了1个分别使用此2种土工材料的尾矿坝加筋界面力学对比试验,试验中法向应力设置有10、20、30、40 kPa四级。结果显示,在直剪与拉拔试验中,Paragrid格栅与尾矿填料的界面似摩擦角比HDPE-TGDG100格栅的高40.25%与4.57%,Paragrid格栅与尾矿填料的界面似黏聚力分别比HDPE-TGDG100格栅的高54.41%、4.69%。数据表明,Paragrid格栅的力学性能更为优良,采用Paragrid格栅对尾矿坝加筋,工程应用效果更好。该研究的成果对于尾矿坝加筋工程的技术改良具有一定指导作用。     

Stability analysis of a copper tailings dam via laboratory model tests: A Chinese case study

The upstream method is a popular method for raising tailings dams. Currently in China there are more than 12,000 tailings impoundments and almost 95% of them use the upstream method for the construction of the dam. Statistical data has shown that the tailings impoundment is one of the main sources of risk in the mining industry. Failures of tailings impoundments have resulted in the loss of many lives, considerable property damage, and irreversible pollution in downstream areas. Therefore, the safety of tailings management facilities has been of increasing concern to governments and local communities. The management of a conventional tailings storage facility requires the maintenance of a high level of structural stability. Therefore, according to the relevant mine Acts, the mine operators are required to conduct stability analyses for all types of tailings facilities, whether they are new, active, or decommissioned. For the stability analysis of tailings dams, the accurate profile of the tailings dam is very important. The profiles are easily obtained for both active and decommissioned tailings facilities because their data can be collected through field investigations. However, collecting basic data from newly constructed tailings facilities is difficult. In this paper, a laboratory physical model test has been performed. The construction process for new tailings impoundment has been physically simulated in the laboratory, where the tailings particle composition and distribution below a beach, the change of phreatic surface of the dam, and the engineering properties of the tailings of the dam profiles have been measured. A new tailings facility, Yangtianqin tailings impoundment, owned by Tongchang copper mine of Yuxi Mine Co., was used as a case study to illustrate the physical modeling of the tailings dam. In the model test, the geometrical model of pond area was constructed according to the scale factor, λ_L, of 1:200 (model:prototype), and the tailings discharge system was also established, the tailings slurry then being discharged based on the design data. Finally, on the basis of the model test results on profiles, the stability analysis of the tailings dam at different heights was conducted under different conditions. The model test results and stability analysis show that the height of the tailings dam should be less than that originally planned. The original design of Yangtianqing tailings impoundment should therefore be revised for the safety of the tailings impoundment.     

尾矿沉积固结对溃坝后尾矿浆体运动特性的影响探究

沉积固结是随着时间增长土体体积压缩的过程。随着尾矿堆积时间增长,孔隙水排出,尾矿密实度增大,土体强度特性和流变特性发生变化。实际生产中尾矿坝加高过快,尾矿沉积固结不充分,不利于尾矿库的稳定,增大了灾害发生几率。通过尾矿库溃坝模型试验探究尾矿沉积固结对尾矿库溃坝后浆体运动特性的影响,研究结果表明:随着下泄距离的增加,尾矿堆积深度逐渐减小,在临近堆积区因底面坡度改变有小幅度的增大;随着沉积固结时间增长,流通区上游尾矿堆积深度逐渐增大,当沉积固结时间超过5h后,尾矿堆积深度开始减小;随着尾矿固结度增大,溃坝量逐渐减少,相较于固结0h溃坝,固结24h溃坝量减小了7%。六组试验堆积区淹没范围随时间的变化规律基本相同,但最大下泄距离随着沉积固结时间增长而减小。用分段函数拟合堆积区溃坝淹没范围随时间的变化规律,为下游防灾避险工作提供参考依据。     

动态剪切环境超细全尾砂絮凝沉降特性

随着矿山选矿工艺的不断提高,充填所用尾砂颗粒呈现超细化。针对超细尾砂浓密脱水困难、底流浓度低等问题,以某矿山钒铁矿尾砂为实验材料,通过自制全尾砂动态剪切浓密实验系统开展絮凝剂筛选及单耗优选试验、动态剪切环境深度浓密试验,分析超细尾砂颗粒在自然沉降、絮凝沉降以及动态剪切环境下的浓密特性,分析尾砂沉降速度与极限底流浓度相关性。结果表明：超细全尾砂自然沉降速率缓慢、底流浓度低;絮凝剂可有效提高尾砂沉降速率,但对底流浓度增加效果不显著;在动态剪切环境中,耙架的低速剪切作用可有效释放絮团包裹水,加速絮团沉降,稳定提高底流砂浆整体浓度。研究结果对强化膏体性能、促进充填系统稳定性和实现绿色矿山建设具有积极推动作用。