Experimental Study of Evaporation from Saline Tailings

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.     

从浮选尾矿中回收白钨矿试验研究

为充分利用矿产资源,提高企业效益,经过近2年的技术攻关,直接从硫化矿浮选尾矿中浮选回收白钨矿试验获得成功。通过粗选工业试验和粗精矿加温小型试验,在白钨入选品位0.25%的条件下,取得了白钨精矿65.046%、回收率50.47%的较好指标。对项目进行可行性研究论证,预计投产后能大幅提高企业效益。     

尾矿库资源调查方法探讨与实践

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。     

某铜浮选尾矿中回收白钨矿的选矿试验研究

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。     

上游法尾矿堆筑坝坝体沉积规律探讨

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.     

选矿尾矿中的石榴子石可选性试验研究

根据矿物性质的差异,对某选矿尾矿中的石榴子石进行了可选性试验研究。结果表明：采用重选、磁选、重选-磁选流程均能获得含量大于90%的石榴子石精矿。     

选矿尾矿中的长石可选性试验研究

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。     

黄金选厂尾砂综合利用技术

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．     

从铜尾矿中回收白钨的选矿试验研究

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。     

从选铁尾矿中回收白钨选矿试验研究

对某选铁尾矿中的白钨进行了综合回收试验研究。根据试料性质,采用了弱磁选-重选-强磁选、弱磁选-重选、弱磁选-重选-浮选等3种方案进行白钨选矿试验,最终确定弱磁选-重选-浮选工艺。试验结果为铁精矿品位Fe65.89%,回收率22.07%,钨精矿品位WO351.64%,回收率为10.94%的分选指标。     

某选铁尾矿回收铁的选矿工艺研究

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。     

从某钼尾矿资源中综合回收白钨的试验研究

采用白钨常温浮选工艺,对某钼尾矿进行综合利用试验研究,经试验室小型闭路试验,获钼精矿含Mo17.56%、回收率71.84%,白钨精矿含WO327.34%、回收率为76.96%的指标。     

Turbulence-Driven Metal Release from Resuspended Pyrrhotite Tailings

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.     

从脱硫尾矿中回收黑白钨矿的试验研究

针对脱硫尾矿中钨的回收进行了选矿试验研究,根据矿石性质,采用简洁、合理的钨选矿工艺流程,在给矿WO3品位0.23%时获得的钨精矿含WO3品位18.69%,WO3回收率69.54%的良好指标。     

从尾矿中回收金红石的试验研究

某矿山尾矿中金红石的嵌布粒度细,连生关系比较复杂,选别难度较大.本研究采用＂离心-浮选＂流程得到了含TiO2 49.56%、回收率32.71%的金红石粗精矿.     

低品位磁铁矿尾矿中钴金属的回收

分析了国内外钴的资源概况,针对豫南磁铁矿尾矿含钴量低,杂质多等特点,结合国内钴回收领域研究成果,提出了对豫南低品位磁铁矿采用:物料准备-湿法浸出-化学除杂-萃取分离-草酸沉钴五个工序回收钴的工艺路线,并对每个工序进行了探讨。     

硫酸烧渣再回收铁试验研究

通过对硫酸烧渣试验研究,确定磁选 浮选的工艺流程回收硫酸烧渣中的铁和硫等元素,取得了较好的技术指标.     

某磁铁矿尾矿中镜铁矿回收试验研究

某磁铁矿选厂尾矿中含低品位镜铁矿,采用SSS-I高梯度磁选机作为粗选设备预先选除大量的尾矿,获得的粗精矿进行粗细分级,细粒级粗精矿采用SSS-I高梯度磁选机精选,磁性物即为镜铁矿,非磁性物和粗粒级粗精矿采用摇床回收镜铁矿的工艺。在给矿TFe品位为8.20%(其中镜铁矿Fe含量1.88%)的条件下,最终可取得品位为61.06%、回收率为20.48%的铁精矿,其中镜铁矿的回收率可达89.24%。     

对某钨尾矿资源的综合回收试验研究

针对某重选尾矿特点,通过系统的试验研究,确定了分选工艺流程,使矿石中钼、铜、锌矿物得到了综合回收,选矿指标先进,为该矿山提高矿产资源综合利用率奠定了技术基础.     

从尾矿中回收铁的选矿试验研究

某尾矿中铁品位达到28％左右,以赤、褐铁矿为主,回收利用价值较高,通过全磁选、磁-重、磁-浮3种不同选别流程的试验研究,确定了全磁选流程为此种矿物最佳处理方案,通过全磁选闭路流程可获得精矿品位59．85％,回收率58．40％的选矿指标,能有效利用资源。