云锡某难选锡铁矿选矿工艺试验研究

对云锡某难选锡铁矿开展选矿试验研究,根据矿石性质,采用阶段磨矿、阶段选别的磁重工艺流程有效地回收了矿石中的锡矿物和铁矿物;流程试验获得粗锡精矿品位11.37%、回收率30.25%,锡富中矿品位3.8%、回收率5.51%,贫中矿品位15%、回收率9.85%,锡综合回收率45.61%;铁精矿产率28.92%、铁品位60.78%、铁回收率67.21%的良好指标。

金船塘难选锡铋矿选矿工艺流程研究

金船塘矿区的黄铁矿磁黄铁矿型锡铋矿是一种难选矿石 ,本文在试验研究的基础上 ,着重对选矿厂原选矿工艺流程进行了分析研究 ,并对其选矿流程进行合理有效地改造和调整 ,从而使该难选矿石取得了较好的选矿技术指标 。

立式搅拌磨机在选锡中矿再磨工艺的应用研究

本文简单介绍了立式搅拌磨机的结构及工作原理,针对云南某多金属选矿厂选锡中矿再磨球磨机磨矿效率低、能耗高、噪音大的问题,在国内首次将立式搅拌磨机成功推广应用到了选锡中矿再磨工艺,并采用纳米陶瓷球作为磨矿介质,大幅提高了选锡中矿再磨的磨矿效率,有利于提高选锡综合回收率,实现了降本增效、节能降耗的目的,大幅降低了作业现场噪音分贝,社会效益显著。

云南某地难选锡多金属矿工艺流程试验研究

依据铁锡铅氧化矿性质,通过磁选—重选、重选—磁选工艺对比试验研究,重选—磁选方案产出的锡铅混合精矿锡品位和锡回收率比磁选—重选方案分别高1.13%和2.32%。产出的铁粗精矿产率和品位、回收率,比磁选—重选方案分别高5.39%、低3.17%和高6.12%,结合云锡处理氧化铁锡矿生产实践,确定重选—磁选为合理的选别工艺方案。

锡中矿氯化焙球氧化固结的研究——难选锡中矿氯化挥发研究之五

为综合利用矿产资源,拟将云锡公司经高温氯化挥发脱除有价金属后的焙球供给昆明钢铁厂作为高炉炼铁之原料。但因焙球机械强度低,故须进行团结处理。本文即报导提高氯化后球团强度的有关研究。一。

塔吉克斯坦某含银铜锡重选粗精矿工艺矿物学研究

塔吉克斯坦某含银铜锡重选粗精矿中的铜、锡难以分离,为了查清铜锡重选粗精矿的成分及分布状态等特征,为选矿工艺的选择提供依据,采用矿物自动分析系统(AMICS)对试样的矿物组成、主要矿物粒度、矿物共生情况、矿物单体解离情况等特征进行研究。结果表明,重选粗精矿中主要有用矿物为孔雀石、羟锡铜石、锡石、黄锡矿等,重选粗精矿中有用矿物粒度大小不一,且连生体较多,共生嵌布关系极为复杂。伴生有用矿物成分为辉银矿、自然银、重晶石、白钨矿等,可考虑进行综合回收利用。基于重选粗精矿的AMICS分析结果,可采用重选—浮选相结合的联合工艺流程分选。

难选锡中矿回转窑高温氯化挥发工艺实践

本语文通过对难选锡中矿高温氯化挥发工艺实际生产过程的论述，详细地总结了十余年来，１００ｔ／ｄ回转窑氯化工艺全流程选定的技术条件和操作中取得的丰富的实践经验，可供从事回转窑高温氯化冶金工作者、工程技术人员和工人从事实际工作参考。

响应曲面法分析难选高硅锡中矿的还原

采用响应曲面法分析难选高硅锡中矿还原过程中相关因素对锡浸出率影响的显著性以及它们之间的相互关系。结果表明,还原时间、还原温度、配碳量对锡的浸出率影响显著且各因素之间是简单的线性关系不存在交互作用,最佳工艺条件为:还原温度850℃、还原时间1.5h、配碳量4%、矿中含硫量2.2%,在此条件下能获得98.54%的锡浸出率。

云南某锌锡铜多金属矿石浮选分离工艺研究

云南某锌锡铜多金属矿的特点是选矿回收的矿物种类多、铜锌锡硫矿物的嵌布粒度细,共生关系密切,选矿难度大。该矿经过一系列的试验研究,最终采用了“铜锌硫优先浮选-磁选脱硫除铁-重选回收锡”的阶段磨矿阶段选别工艺流程。获得的各种选矿产品的选别指标如下:铜精矿品位16.66%、回收率53.18%的;锌精矿品位48.33%、回收率86.04%的;硫精矿品位34.23%、回收率53.39%的;磁选硫精矿:铁品位59.54%、硫品位37.87%、产率0.09%。锡精矿品位44.39%、回收率38.61%;锡富中矿:锡品位2.94%、锡回收率5.56%。

云锡高砷高硫尾矿中有价元素的综合回收

云南个旧地区锡精选厂排出的高砷高硫尾矿中含砷、硫、锡等多种有价元素 ,其中的砷是造成污染的祸首 ,却又是物料中价值最高的。为综合回收利用该尾矿资源 ,减轻环境污染 ,研究了加药预处理后硫砷分离、焙烧提炼白砷、烧渣选锡的组合工艺。在小型试验取得良好指标的基础上 ,工业试生产 2 73d ,获利税 2 1 6 .386 5万元。

Collision and attachment behavior between fine cassiterite particles and H_2 bubbles

Particle-bubble interaction during electro-flotation of cassiterite was investigated by determining the recovery of cassiterite and the collision mechanism of cassiterite particle and H2 bubble. Flotation tests at different conditions were conducted in a single bubble flotation cell. The recovery of cassiterite was found to be affected by cassiterite particle and bubble size. A matching range, in which the best recovery can be obtained, was found between particle and bubble size. Collision, attachment, and detachment of the particle-bubble were observed and captured by a high-speed camera. Particle-bubble collision and attachment were analyzed with the use of particle-bubble interaction theory to obtain the experimental results. An attachment model was introduced and verified through the photos captured by the high-speed camera. A bridge role was observed between the bubbles and particles. Particle-bubble interaction was found to be affected by bubble size and particle size, which significantly influenced not only the collision and attachment behavior of the particles and bubbles but also the flotation recovery of fine cassiterite particles.

Flotation behavior and adsorption mechanism of(1-hydroxy-2-methyl-2-octenyl) phosphonic acid to cassiterite

The flotation behavior and adsorption mechanism of novel（1-hydroxy-2-methyl-2-octenyl） phosphonic acid（HEPA） to cassiterite were investigated by micro-flotation tests, zeta potential measurements, FTIR determination and density functional theory（DFT） calculation. The flotation results demonstrated that HEPA exhibited superior collecting performance compared with styrene phosphonic acid（SPA）. The cassiterite recovery maintained above 90% over a wide pH range of 2-9 with 50 mg/L HEPA. The results of zeta potential measurement and FTIR detection indicated that the adsorption of HEPA onto cassiterite was mainly attributed to the chemisorption between HEPA monoanions and Sn species on mineral surfaces. The DFT calculation results demonstrated that HEPA monoanions owned higher HOMO energy and exhibited a better affinity to cassiterite than SPA, which provided very clear evidence for the stronger collecting power of HEPA presented in floatation test and zeta potential measurement.

Effect and mechanism of octanol in cassiterite flotation using benzohydroxamic acid as collector

The effect of octanol in cassiterite flotation using benzohydroxamic acid (BHA) as a collector was investigated. Theadsorption mechanism of octanol and BHA on the surface of cassiterite was analyzed by adsorption experiments and infrared spectraanalysis. Micro-flotation results indicated that single octanol exhibited almost no collecting power to cassiterite over a wide pHrange. However, as an auxiliary collector, octanol could markedly decrease the consumption of collector BHA and keep the recoveryof cassiterite in high level. The results of adsorption experiments and infrared spectra demonstrated that single octanol was notadsorbed on the surface of cassiterite. It formed adsorption connected with BHA on the surface of cassiterite, and enhanced thehydrophobicity of cassiterite. Octanol promoted the adsorption amount of BHA on the cassiterite surface, and decreased theconsumption of BHA.

Selective recovery of Sn from copper alloy dross and its heat-treatment for synthesis of SnO_2

Preliminary study on concentration and separation of tin(Sn) from copper alloy dross by selective dissolution method was conducted. The tin in the copper alloy dross did not dissolve in an aqueous nitric acid solution which could allow separation of tin from the copper alloy dross. The tin as H2SnO3(metastannic acid) phase was precipitated in the solution with centrifuging process and transformed to tin dioxide(SnO2) after drying process. The dried sample was heat-treated at low temperature and its phase characteristics, surface morphology and chemical composition were investigated.

Flotation performance of anisic hydroxamic acid as new collector for tungsten and tin minerals

In order to improve the recovery of tungsten ores containing tin minerals,anisic hydroxamic acid(p-methoxy benzohydroxanic acid,PMOB)was synthesized and introduced as novel collector in the flotation of scheelite,wolframite and cassiterite.The flotation performance and adsorption mechanism were investigated by micro/batch flotation,zeta potential measurements and density functional theory(DFT).The micro flotation results showed that the recoveries of scheelite,wolframite and cassiterite using PMOB as collector are 97.45%,95.77% and 90.08%,respectively,and the corresponding recoveries are 91.00%,84.30% and 84.67% for benzohydroxamic acid(BHA).The batch flotation results revealed that the collector dosage could be reduced by about 45% for PMOB compared with BHA,in the case of similar flotation indicators.Zeta potential measurements indicated that PMOB could be adsorbed on the mineral surfaces by chemisorption.Moreover,density functional theory(DFT)calculation results showed that the substituent group—OCH_(3)endues PMOB stronger electron donation ability and hydrophobicity compared with benzohydroxamic acid(BHA),pmethyl benzohydroxamic acid(PMB)and p-hydroxyl benzohydroxamic acid(PHB).

ZnO whiskers growth on the surface of Sn9Zn/Cu solder joints in concentrator silicon solar cells solder layer

ZnO whiskers observation on the surface of SnZn/Cu solder joints in concentrator silicon solar cells solder layer is reported. In the experiment,SnZn/Cu samples are left in laboratory after reflow soldering for two years before an examination by SEM,then ZnO whiskers can be observed obviously,which grows out from the rich-Zn phase of the samples and causes electrical short circuit in the electronics appliances,which demonstrates that the SnZn solder shows a risk for the short circuiting failure of an electronic device. Moreover,the growth mechanism of ZnO whiskers is researched based on cracked oxide theory,which provides the reference support for SnZn solders application.

Synthesize of 2,6-Di-O-acetyl Sucrose by Regioselective Acetylation with Dibutyltin Oxide

Di-O-acetyl sucrose was regioselective synthesized by using dibutyltin oxide in about 60% yield. The structure of acetyl derivative was elucidated by 1H NMR, 13C NMR, 2D-NMR and MS spectral data.

Photoelectrochemical characteristics of TiO_2 nanorod arrays grown on fluorine doped tin oxide substrates by the facile seeding layer assisted hydrothermal method

TiO2 nanorod arrays （NRAs） were prepared on,fluorine doped tin oxide （FTO） substrates by a facile two-step hydrothermal method. The nanorods were selectively grown on the FTO regions which were covered with TiO2 seeding layer. It took 5 h to obtain the compact arrays with the nanorod length of -2 μm and diameter of-50 nm. The photoelectrochemical （PEC） properties of TiO2 NRAs are also investigated. It is demonstrated that the TiO2 NRAs indicate the good photoelectric conversion ability with an efficiency of 0.22% at a full-wavelength irradiation. A photocurrent density of 0.21 mA/cm2 is observed at 0,7 V versus the saturated calomel electrode （SCE）. More evidences suggest that the charge transferring resistance is lowered at an irradiation, while the flat-band potential （Vgb） is shifted towards the positive side.