Sulfidation roasting of zinc leaching residue with pyrite for recovery of zinc and iron

Zinc leaching residue(ZLR) contains high content of valuable metals such as zinc and iron. However, zinc and iron mainly exist in the form of zinc ferrite, which are difficult to separate and recover. This study proposed a new process involving sulfidation roasting, magnetic separation and flotation to recover zinc and iron in ZLR. Through sulfidation roasting of ZLR with pyrite, zinc and iron were converted into ZnS and Fe3 O4. The effects of pyrite dosage, roasting temperature and roasting time on the sulfidation of zinc in ZLR were investigated. The results showed that the sulfidation percentage of zinc reached 91.8% under the optimum condition. Besides, it was found that ball-milling was favorable for the separation and recovery of zinc and iron in sulfidation products. After ball-milling pretreatment, iron and zinc were enriched from sulfidation products by magnetic separation and flotation. The grade of iron in magnetic concentrates was 52.3% and the grade of zinc in flotation concentrates was 31.7%, which realized the recovery of resources.

Recovery of Zn, Pb, Fe and Si from a low-grade mining ore by sulfidation roasting-beneficiation-leaching processes

To recover Zn, Pb, Fe and Si from a low-grade mining ore in the Lanping basin, Yunnan Province, China, a novel technology using the roasting with pyrite and carbon followed by beneficiation and hydrochloric acid leaching was proposed. Firstly, several factors such as pyrite dosage, roasting temperature, carbon powder dosage, holding time and particle size affecting on the flotation performance of Zn(Pb) and magnetic separation performance of Fe were simultaneously examined and the optimum process parameters were determined. A flotation concentrate, containing 17.46% Zn and 3.93% Pb, was obtained, and the Zn and Pb recoveries were 86.04% and 69.08%, respectively. The obtained flotation tailing was concentrated by a low-intensity magnetic separator. The grade of iron increased from 5.45% to 43.45% and the recovery of iron reached 64.87%. Hydrochloric acid leaching was then carried out for the magnetic separation tailing and a raw quartz concentrate containing 81.05% SiO2 was obtained. To further interpret the sulfidation mechanism of smithsonite, surface morphology and component of the sample before and after reactions were characterized by XRD and EPMA-EDS. The aim was to achieve the comprehensive utilization of the low-grade mining ore.

Depressing behaviors and mechanism of disodium bis(carboxymethyl) trithiocarbonate on separation of chalcopyrite and molybdenite

This work focuses on the organic depressant,disodium bis(carboxymethyl)trithiocarbonate(DBT),as a selectivedepressant in copper?molybdenum sulfide flotation separation.Micro-flotation,Zeta potential,FTIR and XPS measurements werecarried out to investigate the selective depression mechanism of DBT on chalcopyrite.Zeta potential and FTIR measurementsrevealed that DBT had higher affinity for chalcopyrite than molybdenite and the XPS results of chalcopyrite before and aftertreatment with DBT further proved that DBT adsorbed on chalcopyrite surface.The investigation indicates that the mechanism ofDBT adsorbing on chalcopyrite is mainly physical adsorption.Locked circuit experiments were carried out and the results showedthat DBT could be considered as a cleaner option in commercial Cu?Mo flotation separation circuits.

DRAWING PREDOMINANCE DIAGRAM OF M_1—M_2—x—y SYSTEM AND ITS APPLICATION

Discussions were made of the principle,method and computer program for drawing the pre- dominance diagrams of the bi-metal co-existed system M_1-M_2-x-y in which the multi-me- tallic compounds may be produced by interaction between compounds of both metals.The formation of zinc ferrite and its stable region have been analyzed through drawing Zn-Fe-S-O system predominance diagrams.The availability of the diagram is given the di- rection to roast the zinc sulfide ore as well.

Re-Os Dating of Galena and Sphalerite from Lead-Zinc Sulfide Deposits in Yunnan Province, SW China

Dating of lead-zinc deposits is of critical importance for better understanding of ore genesis, but has long been a big challenge due to the lack of suitable minerals that can be unequivocally linked to the ore genesis and that can be used for tradition radiometric methods. This kind of deposits have simple mineralogy dominated by galena and sphalerite commonly associated with calcite and other gangue minerals. Both galena and sphalerite have low and high variable Re concentrations and thus Re-Os dating of these minerals have been less promising. In addition, the recovery of Re is extremely low for galena when conventional method was applied, lending additional difficulty in precisely dating galena. In this study, we investigate the recovery of Re using different media for anion exchange separation and reporte a revised preparation method for Re-Os dating of galena and sphalerite. By using the new protocol, two reliable Re-Os isochron ages of galena and sphalerite from the Fule（20.4±3.2 Ma） and Laochang（308±25 Ma） Pb-Zn deposits in Yunnan Province, SW China, are achieved.

矿浆难免离子对铅锌硫化矿分离的影响研究进展

这是一篇矿物加工工程领域的论文。矿浆溶液中普遍存在一些难免离子,并且其中存在的难免离子对铅锌硫化矿的浮选分离有着重要影响。矿浆中难免离子主要来源于选厂用水、矿物自身溶解、活化剂或者抑制剂解离以及流体包裹体释放引入的原生离子和磨矿过程中引入的次生离子。本文对矿浆中引入的原生离子以及磨矿体系引入的次生难免离子对铅锌硫化矿浮选分离的影响进行了总结分析发现,不论是原生离子还是次生离子对铅锌硫化矿浮选行为的影响均较为明显,较多的学者针对这种现象进行了大量的研究。通过药剂调控以及改变磨矿环境等方法已经取得了较大的突破,为后续研究者提供了重要的研究思路。本文的关注点是将前人的研究成果与现场工艺紧密结合,在不影响工业经济情况下如何从源头消除难免离子,如何从现场工艺中降低难免离子对浮选指标的影响仍是未来研究的重要方向。

硫化铅锌矿浮选分离研究进展

铅锌分离目前仍是选矿领域的一大难题,介绍了闪锌矿和方铅矿的晶体结构与可浮性,指出了优先浮选、混合浮选、等可浮浮选和异步浮选等传统工艺以及电化学浮选、分支浮选、载体浮选和高浓度浮选等新工艺的特点和适用对象;综述了硫化铅矿捕收剂、硫化锌矿捕收剂、硫化铅锌矿调整剂的研究现状;分析指出了浮选分离工艺的发展方向为高浓度浮选工艺、低碱工艺和无氰工艺等绿色工艺,优化药剂制度和研发环保高效新药剂是未来硫化铅锌矿选矿药剂研究的重要方向。

河北某难选铅锌矿可选性实验

这是一篇矿物加工工程领域的文章。河北某铅锌矿中主要有价元素为铅、锌,品位分别为1.07%、2.08%。矿石中的铅主要赋存于方铅矿中,另有白铅矿、硫酸铅、铅铁矾等含铅矿物,锌主要赋存于硫化物闪锌矿中,占总锌的66.96%,其次为氧化锌矿物,锌氧化率较高。在实验研究中,确定了在-0.074 mm 65%的磨矿细度条件下,优先浮铅再浮锌的工艺。浮选产品中,铅精矿产率1.74%,铅精矿中铅、锌、铜品位分别为51.73%、10.86%、3.81%,回收率分别为83.93%、8.98%、68.20%;锌精矿产率为2.26%,锌精矿中铅、锌、铜品位分别为1.25%、51.64%、0.73%,回收率分别为2.63%、55.42%、16.97%。

铅锌浮选分离有机抑制剂的研究

研究了分子结构对有机抑制剂性能的影响,通过铅锌分离纯矿物试验考察了分子结构简单的脂肪烃有机抑制剂,具有明显的官能团效应。当分子结构中存在苯环时,官能团作用不明显。提出硫化矿铅锌分离有机抑制剂分子选择和设计的依据。对选择出来的有机抑制剂进行了研究,证实了新药剂GZT对铅锌分离起着显著的效果。

从凡口铅锌矿尾矿中回收硫精矿的研究

针对凡口铅锌矿1号尾矿库的尾矿特征,采用0.074 mm细筛分级、摇床重选,使40%的脉石矿物抛尾,减轻了后续磨矿和浮选成本,同时富集了硫、铅、锌、银、镓、锗等有价元素。通过控制加入硫化钠的用量和时间,改善了硫精矿的浮选条件,得到了一种新的从铅锌尾矿中综合回收硫精矿的工艺流程。小型试验结果表明,尾矿经细筛分级、重选和浮选后,得到了含硫35.7%,总回收率为63.5%的硫精矿产品。

铜锌硫化矿分离技术研究及进展

铜锌硫化矿由于可浮性相近,铜离子易活化闪锌矿等原因一直难以分离,是选矿界一大难题,为此,针对铜锌硫化矿浮选分离现状进行了研究,分别从工艺、药剂、理论研究等角度进行了概述.结果表明,随着研究的深入,铜锌硫化矿分离的工艺及药剂都得到了很大地发展,新工艺及新药剂不断涌出,尤其是浮选柱法,由于其操作易控制、节能等诸多优点,在铜锌分离中应用前景广阔,同时加强铜锌分离的理论研究及继续开发新工艺、新药剂势在必行.

建水某铅锌矿选矿工艺研究

针对建水某铅锌硫矿石,采用混选铅硫-选硫化锌矿-再选(浮选或重选)氧化锌矿的流程,可以得到铅品位55.71%、铅回收率63.11%的硫化铅精矿,锌品位48.28%、锌回收率28.71%的硫化锌精矿,及锌品位31.24%、锌回收率52.88%的氧化锌精矿,有价元素得到了有效回收。

内蒙某复杂铜铅锌硫化矿选矿工艺研究

内蒙某矿业公司的复杂铜铅锌硫化矿石铜、铅、锌矿物共生关系非常密切而复杂,给选矿造成极大难度。为了给该矿石的开发提供可行方案,进行了多方案的详细选矿试验,结果表明,常规浮选工艺无法有效分选该矿石,而采用铅重选—铜锌混合浮选再分离浮选的工艺流程,可以获得铅品位为57.20%、铅回收率为54.18%的铅精矿,铜品位为13.35%、铜回收率为57.11%的铜精矿和含锌18.78%、锌回收率为41.94%的富锌物料,富锌物料可以与公司其他选厂锌品位较高的锌精矿搭配销售。

云南某复杂铅锌银硫化矿综合回收试验研究

根据云南某复杂铅锌银多金属硫化矿石的原矿性质进行浮选试验研究。采用石灰抑制含铁矿物,新型抑制剂YZN抑制锌,新型捕收剂BPB捕收铅;以硫酸铜作为选铅尾矿中锌矿物的活化剂,丁基黄药作为锌矿物捕收剂,可以实现铅锌的高效分离,同时将大部分伴生银富集到铅、锌精矿中。在开路试验的基础上进行了实验室小型闭路试验,获得铅精矿品位50.45%、铅回收率86.16%,锌精矿品位50.38%、锌回收率71.80%的选别指标,银在铅精矿中的品位及回收率分别为3062.33 g/t和60.63%,银在锌精矿中的品位及回收率分别为1 008.48 g/t和19.34%。

某复杂铜锌硫化矿高效浮选分离新工艺研究

在铁闪锌矿和黄铜矿两种单矿物浮选试验的基础上,针对某复杂铜锌硫化矿石的原矿性质,用石灰抑制含铁矿物,硫酸锌抑制含锌矿物,丁黄药和2-巯基苯骈噻唑的混合药剂捕收含铜矿物,可以实现铜锌矿物的高效浮选分离。在开路试验基础上进行了实验室小型闭路试验,可获得铜精矿品位22.09%、铜回收率92.11%,锌精矿品位49.13%、锌回收率73.33%的选别指标。

西藏某复杂铜锌硫化矿选矿试验

在对西藏某复杂难选铜锌硫化矿进行矿石性质分析的基础上,按优先浮铜再选锌的原则流程首先分别进行了铜、锌矿物粗选及精选工艺技术条件研究,然后进行闭路流程试验,获得了铜品位为20.10%、回收率为70.26%、含银90.20 g/t的铜精矿,锌品位为42.33%、回收率为75.35%、含银14.80 g/t的锌精矿,铜锌分离效果较好,但富集在铜精矿、锌精矿中的银回收率有待提高。

某铜铅锌多金属硫化矿选矿试验研究

某铜铅锌多金属硫化矿含铜0.38%、铅2.02%、锌2.80%,针对该矿石的工艺矿物学特征,进行了不同药剂种类及用量的条件试验,确定了"铜-铅-锌依次优先浮选"工艺流程。闭路试验获得了含铜20.50%、铜回收率为70.03%、含银8 498.74 g/t的铜精矿和含铅58.67%、回收率为84.16%、铅含银2 200 g/t的铅精矿和含锌50.76%、锌回收率82.91%的锌精矿的较好指标。

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。

内蒙古某复杂多金属硫化矿选矿技术研究

对内蒙古某铜铅锌多金属硫化矿石进行了浮选试验研究。采用"铜铅混合浮选-铜铅分离-尾矿再选锌"的工艺流程,在磨矿细度-0.074 mm粒级占80%条件下,优化药剂制度,获得了铜精矿铜品位20.14%、铜回收率40.27%,铅精矿铅品位62.46%、铅回收率93.56%,锌精矿锌品位48.84%、锌回收率89.27%的选别指标,银总回收率达到了88.01%。

提高北山铅锌矿选矿指标的电位调控浮选研究

通过研究北山铅锌矿矿石中不同矿物在高碱性介质中的浮选特性和分选条件，提出了处理该类矿石的分选新工艺。该工艺的基本点是：将石灰与乙硫氮同时加入磨矿机中，利用这两类药剂在高碱性介质中（ｐＨ＝１２８～１３０，矿浆中有效ＣａＯ含量为１０００～１２００ｍｇ／Ｌ）对矿物选择性的作用，不用其他锌抑制剂，实现了方铅矿与闪锌矿、黄铁矿的有效分离。生产实践证明，新工艺不仅在产品质量及金属回收率方面比原工艺有了显著提高，而且药剂用量也大幅度降低。