Effect of butanol on flotation separation of quartz from hematite with N-dodecyl ethylenediamine

In order to investigate the effect of butanol on quartz flotation when N-dodecyl ethylenediamine(ND)was used as collector, single mineral flotation and artificial mixed mineral(hematite and quartz were mixed at a mass ratio of 3:2) separation were conducted in the laboratory. Experimental results indicated that addition of butanol could improve the collecting performance of ND on quartz and enhance the floatability of quartz. Best flotation recovery of quartz was obtained when butanol was mixed with ND at a mass ratio of 1:1. Moreover, the molecular structure of alcohols had a significant effect on mineral recovery. Best separation efficiency could be obtained when tert-butanol was added as it had the largest cross-sectional area. Zeta potential measurements indicated that alcohols could strengthen electrostatic adsorption between quartz and collector. Molecular dynamic simulations revealed that co-adsorption of alcohols along with ND had taken place on the quartz surface, and ND/tert-butyl combinations were more easily absorbed on the quartz surface.     

微细粒低品位碳酸锰矿强磁选工艺研究

对某地微细粒低品位碳酸锰矿进行强磁选工艺试验,经强磁粗选,可获得品位和回收率分别为22 .64 %和51 .76 %的锰精矿,经疏水絮凝处理可将磁选精矿品位和回收率分别提高到23 .06 %和54 .89 %;经强化疏水絮凝处理,可获得品位和回收率分别为18 .80 %和10 .69 %的扫选精矿.     

中低品位磷矿重介质选矿试验

对宜昌丁东磷矿进行重介质选矿试验.当分离密度为2.96 g/cm^3时,沉物P2O5品位达30.86%,回收率55.61%,MgO为0.95%,可获得合格精矿;当分离密度为2.70 g/cm^3时,浮物可抛去17.35%左右的尾矿,可作中低品位胶磷矿预选作业,若再用浮选,即可获得优质精矿.     

Enrichment of Nb and Ti from carbonatite pyrochlore ore via calcining-slaking followed by gravity separationOA

In this work, a novel process consisting of calcining-slaking followed by gravity separation for the enrichment of niobium(Nb) and titanium(Ti) from carbonatite pyrochlore ore was proposed, validated and compared with the current mainstream flotation method. During calcining of the pyrochlore ore, within which the carbonates were transformed into lime. Subsequently, when the calcined ore was slaked, lime was transformed into hydroxide with fine particles which were amenable to gravity separation...     

Ferronickel enrichment by fine particle reduction and magnetic separation from nickel laterite ore

Ferronickel enrichment and extraction from nickel laterite ore were studied through reduction and magnetic separation. Reduction experiments were performed using hydrogen and carbon monoxide as reductants at different temperatures （700-1000℃）. Magnetic separa- tion of the reduced products was conducted using a SLon-100 cycle pulsating magnetic separator （1.2 T）. Composition analysis indicates that the nickel laterite ore contains a total iron content of 22.50wt% and a total nickel content of 1.91wt%. Its mineral composition mainly con- sists of serpentine, hortonolite, and goethite. During the reduction process, the grade of nickel and iron in the products increases with in- creasing reduction temperature. Although a higher temperature is more favorable for reduction, the temperature exceeding 1000℃ results in sintering of the products, preventing magnetic separation. After magnetic separation, the maximum total nickel and iron concentrations are 5.43wt% and 56.86wt%, and the corresponding recovery rates are 84.38% and 53.76%, respectively.     

辽宁凤城含铀硼铁复合矿分选研究

针对辽宁凤城硼铁复合矿资源,在综合测定矿石成分及其目的矿物嵌布特性的基础上开展矿物分选试验研究,采用弱磁场磁选机回收磁铁矿,应用水力旋流器、螺旋溜槽以及摇床等重选设备回收晶质铀矿物,以氧化石蜡皂作为捕收剂、Na2CO3作为矿浆pH值调整剂浮选分离硼矿物．结果表明,当磨矿细度小于0．047mm占99．26％时,铁精矿中TFe品位达到60．27％,回收率为79．21％;重选回收铀矿物效果较好,但是浮选分离指标有待大幅度提高．进一步提高目的矿物单体解离度是改善分选指标的关键．     

红格矿深还原一熔分过程及钒、铬走向的研究

深还原一熔分固相还原后的金属化球团生产钒铬生铁是利用红格矿的途径之一．由于V2O5与CrO3,的赋存、分布以及冶炼过程中的走向基本一致,综合回收利用二者可一起考虑．为了提高钒、铬回收率,实现钛和铁的有效分离,通过单因素试验考察了在氩气保护下,配料的碱度、深还原一熔分温度和配碳量对熔分过程和钒、铬走向的影响．结果表明,当熔渣碱度为1.2,配碳量为0.5％,熔分时间为15min,熔分温度为1610℃时,渣铁的分离效果较好,且有利于钒、铬熔于铁相．     

阎地拉图红铁矿选矿工艺研究

对阎地拉图红铁矿进行了焙烧磁选、强磁选、重选及重选－强磁选四种选矿工艺的试验研究，结果表明，用螺旋溜槽选别＋０．０７４ｍｍ粒级，用强磁选别－０．０７４ｍｍ粒级的重选－强磁选方案可得到品位为５１．００％、回收率为７２．３０％的综合铁精矿。该方案投资少，生产成本低，适合现厂的实际。     

Testing the robustness of particle-based separation models for the magnetic separation of a complex skarn oreOA

Physical separation processes are best understood in terms of the behaviour of individual ore particles.Yet, while different empirical particle-based separation modelling approaches have been developed, their predictive performance has never been tested under variable process conditions. Here, we investigated the predictive performance of a state-of-the-art particle-based separation model under variable feed composition for a laboratory-scale magnetic separation of a skarn ore. Two scenarios wer...     

Beneficiation of the gold bearing ore by gravity and flotation

Gold concentration usually consists of gravity separation, flotation, cyanidation, or the combination of these processes. The choice among these processes depends on the mineralogical characterization and gold content of the ore. Recently, the recovery of gold using gravity methods has gained attention because of low cost and environmentally friendly operations. In this study, gold pre-concentrates were produced by the stepwise gravity separation and flotation techniques. The Knelson concentrator and conventional flotation were employed for the recovery of gold. Gold bearing ore samples were taken from Gümüshane Region, northern east part of Turkey. As a result of stepwise Knelson concentration experiments, a gold concentrate assaying around 620 g/t is produced with 41.4wt% recovery. On the other hand, a gold concentrate about 82 g/t is obtained with 89.9wt% recovery from a gold ore assaying 6 g/t Au by direct flotation.     

一种风化低品位铁矿石的可选性试验

随着铁矿资源的日益贫乏,对低品位矿石的开发利用成为选矿的发展趋势。山东省某矿业公司矿石属于风化程度较高的低品位铁矿石,样品粒度为10～0mm,含水量1％～2％。根据试样的性质和风化矿分选的经验,采用干式磁选抛尾、干选粗精矿再磨再选的试验流程,获得品位为66％的精矿产品,对低品位铁矿石的开发利用具有一定的借鉴意义。     

空分设备的防爆探讨

制氧行业中,空气分离设备在使用中稍有不慎便会引发爆炸事故,其后果是十分严重的,轻则设备受损,重则人员伤亡。本文从实际出发,从空分设备发生爆炸的原因着手,提出了一些防止爆炸的方法。     

中贫氧化矿高梯度磁选试验研究

对白云鄂博中贫氧化矿进行了高梯度磁选试验,着重研究了磁感应强度、矿浆流速对磁选指标的影响．采用粗选（B=0．6T）-精选（B=0．15T）工艺,在矿浆流速5．6cm／s、矿浆浓度20％的条件下,选出的铁精矿品位为60．0％。回收率达到79．5％．     

Beneficiation studies on recovery and in-depth characterization of ilmenite from red sediments of badlands topography of Ganjam District,Odisha, India

This paper deals with the recovery of ilmenite mineral from red sediments of badlands topography and suggested flowsheet with material balance. The results of these investigations reveal that the red sediment samples contain 33.2% total heavy mineral, in which ilmenite mineral concentrate is 28.71% (by weight). The ilmenite concentrate recovered from red sediment sample by physical beneficiation process, which included scrubbing, desliming, gravity concentration, magnetic and electrostatic separation, contains 99.41% grade with 97.3% recovery. The ilmenite mineral concentrate recovered from red sediments is also suitable for industrial applications. The characterization studies on ilmenite reveal that the TiO₂ percentage is marginally increasing from 46.69% to 47.86% with increasing magnetic intensity from 0.46 to 1.55 T.     

Effects of nanobubble and hydrodynamic parameters on coarse quartz flotation

Quartz, the second most abundant mineral in the earth's crust, is a gangue mineral in practically every flotation process. Coarse quartz flotation has been a long standing problem in various mineral processing plants to reduce milling cost and increase valuable mineral recovery. Based on this, the effects of nanobubbles(NBs) and hydrodynamic parameters on coarse quartz particle flotation were systematically investigated. Mechanical flotation experiments were carried out using the 7 cm and 9 cm diameter impellers in order to produce different hydrodynamic conditions. 900–1300 rpm impeller speeds were used for the 7 cm diameter impeller and 554–786 rpm for the 9 cm diameter impeller. The results show that the presence of NBs increased the flotation recovery of à425 + 106 lm quartz by up to 21%. For the7 cm diameter impeller, the maximum flotation recoveries of 86.4% and 98% were obtained in the absence and presence of NBs at Reynolds number(Re) of 81,000 and 66,000, respectively. For the 9 cm diameter impeller, the maximum recoveries of 86.3% and 97.5% were obtained in the absence and presence of NBs at Re of 90,000 and 75,000, respectively. NBs increased the flotation rate constant up to 36%.     

硫化铅锌中矿分离工艺的研究

通过对陕西凤县上川硫化铅中矿分离工艺的研究，提出了一种以连二亚硫酸钠为主导作用的铅锌中礅分离工艺。即在完全消除中矿所含药剂影响在中性矿浆中使用连二亚硫酸钠加硫酸锌作闪锌矿的抑制剂，较好地解决了铅锌中矿分离问题。     

金矿床中石英的标型性质及实际应用

石英是金矿床中普遍出现的脉石矿物,同时也是重要的造矿矿物。论文积累了国内外对金矿床中石英的矿物学研究资料,对石英的标型特征及其地质解译作了全面总结,介绍了石英的晶形、组构、颜色、比重、热发光性、压电性、导电性、介电性、红外吸收谱、顺磁共振、晶胞参数、稀土元素、微量组分、包裹体、稳定同位素组成及光轴定向测量16种标型性质及其它们在金矿地质中的应用。     

苏州硫酸渣中铁矿物特征及其对选矿指标的影响

对苏州硫酸渣进行了多种分析测试．查明了硫酸渣中主要铁矿物的矿物特征与天然铁矿物的差异，并分析其对选矿指标的影响，初步探讨改善选矿指标的途径．