某低品位含银铅锌硫化矿优先浮选研究

某含银铅锌硫化矿含铅1.66%、含锌1.63%、含银12.3 g/t,铅锌含量低,矿物单体粒度小且嵌布不均匀,单体解离困难。为了给该矿石的铅、锌、银资源开发利用提供技术依据,对其进行了选矿试验。结果表明:采用铅锌优先浮选流程,在磨矿细度为-74μm占70%条件下,铅粗选以25号黑药为捕收剂,硫酸锌为抑制剂;锌粗选以石灰为p H值调整剂,丁基黄药为捕收剂,硫酸铜为活化剂,YS为抑制剂;铅锌系统各经一次粗选三次精选两次扫选作业,闭路试验可获得铅品位70.35%、含锌3.48%、含银292.00 g/t、铅回收率96.59%、银回收率51.11%的铅精矿和锌品位43.84%、含铅0.32%、含银32.20 g/t、锌回收率86.60%、银回收率8.08%的锌精矿,铅锌分离效果较好,银在铅精矿和锌精矿中总回收率达到59.19%。     

硫化钠诱导浮选的应用研究

研究了闪锌矿、方铝矿和黄铁矿的硫化钠诱导浮选行为．研究发现，硫化钠的加入．使得黄铁矿、方铝矿的可净性变好．通过在湖北某矿山的实践表明，硫化钠诱导浮选可以使得Ph－Zn分离效果好，回收率提高，同时回收了硫精矿．     

会泽铅锌矿方铅矿、闪锌矿和黄铁矿的浮游性研究

本文考查了ZnSO4和可溶性淀粉对方铅矿、闪锌矿和黄铁矿浮游性的影响，为会泽铅锌矿铅硫异步等可浮工艺提供了理论依据。试验结果表明，在乙黄药浮选体系中，ZnSO4和可溶性淀粉强烈抑制闪锌矿，而对方铅矿和黄铁矿的浮游性影响不大，且两者的浮游性相近。     

Pressure leaching of a lead-zinc-silver concentrate with nitric acid at moderate temperatures between 130 and 170 °C

The aim of this investigation was to study the oxidative leaching of lead and silver from a lead-silver concentrate containing galena, sphalerite, pyrite and argentite in nitric acid solutions above the melting point of sulfur (119 °C). The elemental sulfur formed was expected to agglomerate, thereby slowing its oxidation to sulfate and inhibiting the precipitation of lead and silver sulfate.The experimental conditions employed 0.13-0.65 M nitric acid, which is 3 to 15 times the stoichiometric amount needed to form sulfur, at temperatures between 130 and 170 °C. Higher acid concentrations have a favorable effect on silver and lead dissolution at 130 °C with about 90% Ag and 80% Pb extracted into 0.65 M nitric acid within 90 min. However, an increase in temperature caused a decline in the extraction of both metals, due to the greater amount of sulfate produced. Pyrite was found to oxidize directly to akaganeite and sulfate ion and promotes the formation of plumbo- and argento-jarosite. X-ray diffraction analyses of the leach residues show the presence of anglesite (PbSO₄), plumbo-jarosite (PbFe₆(SO₄)₄(OH)₁₂), elemental sulfur (S-β) and akaganeite (FeO(OH)). Enhanced silver extraction was obtained when the oxidation was carried out in the presence of citrate ion which was added to complex with lead and silver ions.     

Investigation into the flotation response of refractory molybdenum ore to depressant mixtures:A case study

In this paper, bulk flotation followed by separation was investigated to concentrate purified molybdenite product from Jinduicheng molybdenum ores(Shanxi province, China). The bench scale tests mainly focussed on separation of molybdenite from other sulfide minerals using the new type of depressants.The effect of each single depressant, including organic depressant-modified dextrin(MD), P-Nokes reagent(PN) and sodium trithiocarbonate(ST), and their mixtures on galena, chalcopyrite and other sulfide ores, was examined in turn by changing the concentrations used in cleaner flotation tests. Closed circuit experiments were carried out under the optimal condition and satisfying recovery and grade of molybdenite concentrate could be achieved(86.294% and 53.157%, respectively). A potential reagent regime was developed, with more environmental friendly and more economical advantages due to the introduction of modified dextrin.     

Effect of particle size on the surface oxidation and flotation behavior of galena particles in lime system

ABSTRACT

In this research, the effect of particle size on the surface oxidation and flotation behavior of galena in the lime system was studied. Coarse (?0.074 + 0.038 mm), intermediate (?0.038 + 0.025 mm) and fine (?0.025 mm) galena particles were used in the experiment. The dissolution tests, flotation tests, and sorption tests were accomplished. Through further analysis by XPS, the effect of particle size and lime was observed. The decrease of mineral particle sizes increased the adsorption ratio of collector and the dissolution of galena, while the hydrophilic product OH^?/Ca(OH)⁺ produced by dissolution occupied the dominant position, which led to the minerals hydrophilic.     

西北某难选铅锌矿石浮选试验

西北某铅锌矿是一个矿物成分复杂、铅锌矿物分布极不均匀、嵌布粒度细微、嵌布关系复杂、单体解离难度大、脉石矿物硬度高的大型难选铅锌矿床。为确定该资源的开发利用方案,采用优先浮选工艺对该矿石进行了选矿试验。结果表明,在磨矿细度为-0.074 mm占85%的情况下,采用1粗1扫3精选铅(铅精选前再磨至-0.045mm占95%)、1粗1扫2精选锌、中矿顺序返回的闭路流程处理该矿石,可取得铅品位为60.45%、含锌8.90%、铅回收率为75.95%的铅精矿以及锌品位为51.60%、含铅0.31%、锌回收率为87.39%的锌精矿,该选矿工艺方案是该矿石的高效开发利用方案。     

新型铅抑制剂在铜铅分离中的抑制作用及机理研究

由于传统的环保型铅抑制剂难以使铜铅混合精矿得到有效分离,故本文介绍一种新型方铅矿抑制剂PD-2。通过单矿物浮选试验、人工混合矿分离试验以及动电位测定、红外光谱分析、吸附量测定,研究了PD-2在铜铅分离中的抑制作用及机理。试验结果表明,当乙硫氨酯(Z200)作为捕收剂时,PD-2对方铅矿的抑制作用明显强于黄铜矿,在适当条件下可实现铜铅分离。其作用机理为PD-2能够选择性化学吸附在方铅矿表面,在黄铜矿表面吸附较弱,且PD-2在方铅矿表面的吸附强于捕收剂Z200在方铅矿表面的吸附,能够阻碍Z200在方铅矿表面的吸附,同时,PD-2分子中的亲水基能够使方铅矿得到有效抑制,从而达到"抑铅浮铜"。     

磨矿环境对方铅矿浮选行为的影响研究

针对方铅矿单矿物,分别使用瓷罐瓷球与瓷罐铁球磨矿并进行浮选,考察磨矿时间、矿浆溶液的酸碱度、捕收剂的用量与方铅矿浮选效果的关系。结果表明,瓷介质磨矿比铁介质磨矿更有利于方铅矿的浮选;高碱环境有利于方铅矿的浮选;捕收剂用量越高越有利于方铅矿的浮选;采用铁介质磨矿时,磨矿时间延长,方铅矿浮选回收率降低,而采用瓷介质磨矿,磨矿时间对其影响不大;采用铁介质磨矿,铁介质氧化生成羟基氧化铁覆盖在方铅矿表面,改变了方铅矿表面组成,增加了方铅矿亲水性,对方铅矿的浮选产生负面影响。     

新型环保有机铅抑制剂在硫化铜铅分离中的应用

鉴于当前采用传统环保铅抑制剂用于铜铅分离效果不理想的问题,本文介绍一种新型环保有机铅抑制剂PD-1。通过单矿物试验和人工混合矿分离试验研究其对方铅矿以及黄铜矿的抑制作用差异,并与重铬酸钾等传统铅抑制剂的分离效果进行对比。结果表明,PD-1在乙硫氨酯(Z200)作为捕收剂的铜铅分离体系中,能够抑制方铅矿的上浮而不影响黄铜矿的回收,从而实现铜铅分离。和传统铅抑制剂相比,PD-1具有用量少、毒性低的优点,有望成为重铬酸钾的替代品。