Hydrothermal sulfidation of zinc-containing neutralization sludge for zinc recovery and stabilization

The conventional lime-neutralization process generates a huge volume of neutralization sludge (NS). The disposal of NS is difficult because it contains large amounts of heavy metals, moisture and complex components. The present study describes the application of hydrothermal sulfidation (HS) toward the conversion of certain heavy metals (mainly zinc) in NS to metal sulfide (MeS) for subsequent metal recovery through flotation. The effects of temperature, time, sulfur concentration and liquid-to-solid ratios were investigated under laboratory conditions. The extent of zinc sulfidation was up to 85% under optimal conditions. Flotation tests indicated that the ZnS produced could be separated from the NS, increasing the recovered Zn concentration from 19.9% to 38.8%. The toxicity characteristic leaching procedure (TCLP) revealed that stabilization and detoxification of heavy metals occurred during sulfidation. The formation of metal sulfide by HS enhanced the stabilization effect. Moreover, flotation technology provided a means to enhance metal recovery from the NS.     

Sulfidation roasting of low grade lead–zinc oxide ore with elemental sulfur

Low-grade complex Pb–Zn oxide ore is an important source, and the reserve is very great in the world. It is very difficult to obtain Pb and Zn from the source by traditional technology. In this work, a new technology characterized by sulfidation of low grade Pb–Zn oxide ore with elemental sulfur was developed. The effects of temperature, time, particle size and sulfur amount on the sulfidation extent of Pb–Zn oxide ore was studied at a laboratory-scale. The experimental results show that the sulfidation extent of Pb and Zn oxide reaches 98% and 95% under the optimum conditions, respectively. A flotation concentrate was obtained with 38.9% Zn and 10.2% Pb from the materials which was treated by sulfidation, and the recovery of Zn and Pb is 88.2% and 79.5%, respectively.     

四川某浸锌渣稳定化处理与无尾综合利用研究

为了解决会理鑫沙锌业浸锌渣堆放引起的环境污染问题，同时针对其铅、锌含量高的特点，将氧压浸锌渣和硫化钠加入棒磨机进行机械硫化固化、浮选处理。通过条件试验确定了棒磨硫化和浮选流程的参数，并对浮选尾矿进行了浸出毒性检测和制备硫磺建材的试验。试验结果表明：在合适的条件下可以同时实现铅、锌硫化率超过90%，在此基础上获得了硫品位65.26%、硫回收率7814%的硫磺精矿，铅品位45.29%、铅回收率80.02%的铅精矿，锌品位41.02%、锌回收率7014%的锌精矿。浮选尾矿重金属浸出毒性符合国家标准，利用其可制备出抗压强度大于45 MPa、吸水率小于1%的硫磺建材，最终实现了该浸锌渣的高质量稳定化与无尾综合利用。     

难选高硫低品位硫化铅锌矿分选工艺研究与探讨

某难选高硫低品位硫化铅锌矿石,主要有价元素Pb、Zn、Fe和S含量分别为2.45%、2.76%、26.76%和30.63%,主要赋存矿物分别是方铅矿、铁闪锌矿和黄铁矿,含量分别为2.97%、4.76%和54.65%;矿石中方铅矿和铁闪锌矿含量较低,而黄铁矿含量超过55%,有用矿物含量差异极大;有用矿物间关系密切,存在相互共生和相互包裹,属于难选硫化铅锌矿石。为确定合理工艺流程,进行了全优先浮选、铅硫部分混合浮选及等可浮选等方案的对比试验研究。结果表明,全优先浮选得到的铅精矿Pb品位和锌精矿Zn品位均很低,通过该流程很难得到合格的铅精矿和锌精矿,主要原因为大量黄铁矿难以有效抑制,同时添加大量石灰调整pH对矿浆环境产生不利影响;铅硫部分混合浮选得到的铅精矿Pb品位偏低,但Zn回收率偏低,造成该问题主要原因为部分铁闪锌矿与黄铁矿存在连生未解离,同时大量铅硫混合精矿经再磨后黄铁矿难抑制;而等可浮选即铅硫等可浮+铅硫分离—锌硫等可浮+锌硫分离工艺流程可得到铅精矿Pb品位60.41%、Pb回收率82.38%,锌精矿Zn品位48.75%、Zn回收率81.59%的良好指标,该流程对大量黄铁矿进行了分段...     

某银铅锌多金属难选矿石选矿试验研究

通过对某银铅锌多金属矿进行系统的浮选试验研究,确定了采用"硫化银浮选—脱泥—氧化铅浮选—氧化锌浮选"的工艺流程进行有价金属矿物回收。闭路试验可以获得良好指标:银品位为2 300 g/t、回收率为40.87%的银精矿,铅品位为52.08%、回收率为64.45%的铅精矿,锌品位为32.00%、回收率为40.16%的锌精矿,银的总回收率为64.56%。浮选尾矿和矿泥中损失的银可以通过氰化浸出回收,银的浸出率为68.15%。     

某高硫铅锌多金属矿选矿工艺试验

为高效回收利用某高硫铅锌多金属矿对其进行了半荧光分析、XRD分析和SEM分析及选矿工艺试验研究。试验研究结果表明：该矿可回收利用的金属元素为铅、锌、银,其中铅主要赋存于方铅矿中,锌主要赋存于闪锌矿中,银主要与方铅矿伴生;矿石中铅锌矿物紧密共生、嵌布特性复杂,其铅、锌、银的品位分别为1.76%、3.97%和22.03 g/t;试验采用浮铅抑锌的优先浮选工艺和正交试验优化浮选药剂制度处理该矿石,实现了铅、锌、银的综合回收,最终获得了含铅57.57%、含银564.26 g/t、铅回收率为89.63%、银回收率为70.18%的铅精矿,锌品位为46.44%、锌回收率为76.97%的锌精矿;实现了该矿的综合回收及高效利用。     

低品位氧化锌矿硫化焙烧回收锌工艺研究

以黄铁矿为硫化剂, 云南低品位氧化锌矿为研究对象, 采用硫化焙烧使氧化锌和黄铁矿发生反应, 生成硫化锌, 然后用硫化矿的常规浮选工艺回收锌。试验考察黄铁矿用量、焙烧温度、焙烧时间对硫化效果的影响。研究结果表明: 在黄铁矿用量为25%、焙烧温度为800 ℃、通氮气保护条件下焙烧180 min, 氧化锌矿的硫化率可达83.59%。处理后的物料采用常规硫化矿浮选法进行浮选, 经过一次粗选, 获得锌粗精矿品位为14.3%, 回收率为64.7%。     

银铅无碱混选工艺分选含银低品位铅锌硫化矿石

对某含银低品位铅锌硫化矿进行了选矿工艺流程的试验研究.根据矿石性质,采用银铅混选(银铅粗精矿再磨)-锌浮选和银铅混选(银铅中矿再磨)—锌浮选两种原则工艺流程进行试验研究,银铅混选时,采用选择性的银铅捕收剂组合BK906+BK903G在近中性的无碱条件下将银矿物和硫化铅矿物浮出,获得银铅混合精矿;然后通过常规的石灰+硫酸...     

浮选分级—抑制及再活化硫化矿混合精矿的分离浮选研究

对从苏州高岭土尾矿中用浮选法得到的硫化矿混合精矿进行了硫及铅锌混合精矿的分离浮选试验研究。在不磨矿的条件下,采用浮选分级-抑制及再活化浮选方法获得了铅、锌品位分别为19.95%、30.1%,回收率分别为82.00%、81.29%的铅锌混合精矿和硫品位和回收率分别为52.49%、75.5%的硫精矿。     

内蒙古某高硫铜铅锌多金属矿浮选试验

内蒙古某高硫铜铅锌多金属矿矿石性质复杂,金属矿物之间共生密切。按探索试验确定的铜铅混合浮选-铜铅分离-抑硫浮锌流程进行了选矿工艺技术条件研究。结果表明,采用1粗4精1扫铜铅混浮、1粗1精1扫铜铅分离、1粗4精1扫抑硫选锌、中矿顺序返回闭路流程处理,可以获得优质铜精矿、铅精矿、锌精矿、硫精矿,且产品中其他杂质元素含量均较低,达到了铜、铅、锌、硫分离效果。     

Sulfidation of heavy-metal-containing metallurgical residue in wet-milling processing

This paper describes the application of wet-milling sulfidation to achieve an efficient conversion of heavy metals (mainly Pb) in metallurgical residues to metal sulfide (MeS) for subsequent metal recovery through floatation. The effects of Na₂S-to-Pb ratio (Na₂S:Pb), ball-to-material mass ratio (B/M), and milling time on the extent of sulfidation were investigated under laboratory conditions. Under the optimal conditions, 73.2% of Pb in sludge can be converted to PbS within 1 h. The comparison of wet-milling sulfidation and contacting sulfidation was performed to test the efficiency of two sulfidation methods and the selective floatabilty of the synthetic sulfides. The results show that wet-milling efficiently improved the sulfidation extent as well as the floatation recovery. Compared with MeS_(C) (sulfide formed by contacting sulfidation), MeS_(M) (sulfide formed by milling sulfidation) had a smaller particle size, which was not beneficial for its floatability. However the improved sulfidation extent and dispersity can help to increase PbS_(M) recovery.     

甘肃某铜铅锌多金属矿选矿试验研究

对甘肃某铜铅锌多金属矿进行了浮选试验研究,结果表明,采用反浮选除炭—铜铅混合浮选—铜铅分离—尾矿选锌选硫的工艺流程,可获得铜品位14.32%、铜回收率37.68%的铜精矿,铅品位45.60%、铅回收率83.21%的铅精矿,锌品位47.45%、锌回收率92.71%的锌精矿,硫品位31.26%、硫回收率26.52%的硫精矿,达到了对该矿的综合利用。     

低品位微细粒氧化铅锌矿选冶工艺研究

针对国外某氧化铅锌矿开展了选冶联合工艺研究, 采用硫化焙烧-浮选工艺回收铅、锌。工艺矿物学研究表明, 矿样中的锌主要以硫化锌和碳酸锌两种形式存在, 铅主要以硫化铅和铅铁矾形式产出。闪锌矿和菱锌矿属于微细粒和细粒嵌布的范畴。硫化剂、焙烧时间和焙烧助剂是影响硫化焙烧效果的主要因素, 而焙烧温度、物料粒度的影响不显著。矿石中含有黄铁矿, 因此硫化焙烧不需另外添加硫化剂。采用硫化焙烧-混合浮选工艺, 在焙砂磨矿粒度-0.038 mm粒级占92.56%条件下, 经一次粗选、三次扫选、十次精选闭路流程选别(中矿顺序返回), 可获得产率22.96%、含Pb 9.87%、含Zn 38.92%、Pb+Zn品位为48.79%的混合铅锌精矿, Pb、Zn回收率分别为75.79%和79.78%。     

甘肃某复杂铜铅锌硫化矿石浮选新工艺研究

为解决甘肃某铜铅锌多金属硫化矿矿石性质变化后原选矿工艺流程不能适应的问题,进行了铜与部分铅锌优先混合浮选再分离浮选-其余铅锌与硫混合浮选-铅锌与硫分离浮选新工艺的试验研究,闭路试验获得了铜精矿铜品位为20.99%、铜回收率为74.23%,铅锌混合精矿铅和锌品位分别为16.65%和27.32%、铅和锌回收率分别为91.11%和93.32%,硫精矿硫品位为41.62%、硫回收率为37.58%,伴生金和银在铜精矿和铅锌混合精矿中的总回收率分别为83.84%和88.27%的良好指标。     

某黝铜矿型铜铅锌多金属矿选矿试验研究

对某黝铜矿型铜铅锌多金属矿进行了选矿试验研究。结合矿石性质及一系列探索试验研究结果,最终采用铜铅混浮-混浮精矿再磨-铜铅分离-混浮尾矿浮锌-锌尾矿浮硫的工艺回收该矿中的铜、铅、锌和硫,闭路试验获得了铜精矿铜品位18.25%、铜回收率73.88%,铅精矿铅品位59.91%、铅回收率82.06%,锌精矿锌品位50.15%、锌回收率91.82%,硫精矿硫品位49.96%、硫回收率74.14%。通过所确定的工艺流程与药剂制度对选矿工艺进行了改造,改造后铜精矿品位提高6.51个百分点,铜回收率提高8.68个百分点,铅、锌回收率分别提高6.59和2.36个百分点。     

云南某硫化铅锌矿工艺矿物学及选矿试验研究

针对云南某硫化铅锌矿,方铅矿嵌布粒度细、黄铁矿含量高的特点,进行了工艺矿物学与浮选回收技术研究。采用铅硫混浮-混合粗精矿再磨-铅硫分选-锌硫分选选矿回收工艺,基于全流程主要条件试验确定最佳工艺技术条件。实验室全流程闭路试验获得了Pb品位65.52%,Pb回收率87.51%,含锌3.89%的铅精矿;锌1,锌2合计Zn品位54.74%,Zn回收率95.02%的锌精矿及Fe品位42.02%,Fe回收率78.26%硫精矿。目的矿物方铅矿、闪锌矿和黄铁矿均得到良好回收。     

某微细粒含碳高硫铅锌矿选矿试验研究

某铅锌矿含铅7.41％、锌13.70％、硫31.25％、碳1.45％,铅锌矿物嵌布粒度微细,属微细粒高硫含碳难选硫化铅锌矿.根据矿石性质,采用"脱碳—铅锌依次优先浮选—铅锌粗精矿再磨精选"工艺流程考察了碳粗选磨矿细度、铅锌粗精矿再磨细度和铅锌浮选药剂制度对选别指标的影响.结果表明,以BK9032为方铅矿捕收剂,以硫酸锌...     

某硫化铅锌矿的优先浮选分离工艺研究

选择性捕收剂乙硫氮对广西某硫化铅锌矿的优先浮选工艺有良好作用.优先浮铅时添加石灰、硫酸锌、乙硫氮;浮锌时添加石灰、硫酸铜、丁黄药.产出铅精矿Pb品位75.03％,Pb回收率94.50％;锌精矿Zn品位58.00％,Zn回收率92.30％.获得了良好的试验指标.     

云南某铅锌多金属矿选矿试验研究

在对云南某铅锌多金属矿进行简单工艺矿物学研究的基础上,按拟定的铜铅混浮-铜铅分离-锌硫混浮-锌硫分离原则流程进行了磨矿细度、药剂种类及用量条件试验,采用1粗1扫2精混浮铜铅、1粗1扫2精铜铅分离、1粗1扫2精混浮锌硫、1粗1扫2精锌硫分离、中矿顺序返回的闭路试验流程处理该矿样,获得了铅品位45.26%、回收率81.33%的铅精矿,锌品位45.97%、回收率88.29%的锌精矿,分选指标理想,但综合回收产品铜精矿和硫精矿的指标有待提高。     

贵州某铅细粒嵌布的高硫铅锌矿浮选工艺研究

针对贵州某铅和硫嵌布粒度细、硫含量较高的铅锌矿开展浮选工艺研究。结果表明,磨矿细度-0.074mm占60%,采用优先浮选流程,铅浮选流程为"一粗三精三扫"、锌浮选流程为"一粗三精三扫"、硫浮选流程为"一粗一精二扫",能获得合格精矿,铅精矿中铅品位43.29%、回收率78.33%,锌精矿中锌含量为44.90%、回收率91.21%,硫精矿硫含量为45.85%、回收率为58.99%。