Improvement of flotation behavior of Mengzi lead-silver-zinc ore by pulp potential control flotation

The electrochemical behavior of Mengzi lead-silver-zinc ore flotation system was studied. Based on the electrochemical characteristics of sulfide mineral flotation system, a stage potential control flotation was developed with the main parameters of pulp potential（φp）, pH value and collector dosage. Using N,N＇ diphenylamino-dithiolphosphoric acid（NNDDC） as a collector, which has good selectivity for galena flotation at pH 8.8 and pulp potential 330 mV, DDTC is used as secondary collector to improve both the grade and recovery of Pb and Ag. The pulp potential values significantly influence the floatability of practical minerals and single minerals when using NNDDC as the collector. The flotation recovery of galena reaches 85% at about 0.3 V and pH8.8. With the usage of pulp potential control during grinding and flotation, the new pulp electrochemical technology for Mengzi lead-silver-zinc ore flotation was developed. The results show that the grades of Pb and Ag of galena concentrate are 55% and 1 800 g/t, respectively, while the recoveries of Pb and Ag are 86.5% and 65%, respectively, the grade of Zn of marmatite concentrate is 42.5%, and the recovery of Zn is 91.25%.     

Optimization of reagent dosages for copper flotation using statistical technique

The effects of Z11 and AP407 collectors as well as AF65 and AF70 frothers were evaluated in the rougher flotation circuit of the Sungun copper concentrator plant using 2 4 full factorial design.Response functions were produced for both Cu grade and recovery and optimized within the experimental range.The optimum reagent dosages were found to be 12.01 g/t Z11,11 g/t AP407,3 g/t AF65 and 5 g/t AF70 to attain the maximum Cu grade(8.17%).The reagent dosages of 12 g/t Z11,11 g/t AP407,3 g/t AF65 and 15 g/t AF70 produced the maximum Cu recovery(86.44%).The collector distribution demonstrated that the distribution pattern of(32%,32%,20%,16%)can produce the best recovery(87.75%)in comparison to other examined distribution patterns.     

Relationship between solids flux and froth features in batch flotation of sulphide ore

The froth features in the batch flotation of a sulphide ore were investigated by using the digital image parameters of the froth, the small number emphasis（Nsne）, the average grey level（Dagl） and the instability number （Nins）, under different conditions of impeller speeds and aeration rates. It is found that the value of Nsne is strongly dependent on the average bubble size of the froth and Dagl on the volume fraction of solid in the froth, and the froth features during the batch flotation are influenced by impeller speed and aeration rate. A kinetic model of the concen- trate solid flux was developed which relates the flotation process to the image parameters, Nsne and Dagl of the froth and predictions are well consistent with the experimental data.     

FTIR spectroscopic study of electrochemical flotation of jamesonite-diethyldithiocarbamate system

1 Introduction Flotation electrochemistry and modern surface analytical techniques have enhanced our understanding of reagent-mineral interaction mechanism. Great progress has been made by applying various electrochemical techniques to investigate the int…     

酸性体系中蛇纹石矿泥的抑制及其对硫化铜镍矿浮选的影响

为了消除硫化铜镍矿物表面的氧化膜,抑制蛇纹石等含镁脉石矿泥对浮选影响,在硫化铜镍矿的酸性浮选工艺的基础上研究了羧甲基纤维素(CMC)对硫化铜镍矿浮选过程的优化效果,并探讨了CMC的作用机理。结果表明:1×10^?3 mol/L盐酸溶液及20 min超声预处理可以显著强化硫化铜镍矿的可浮性,酸性浮选体系可以在更宽的pH范围内取得较好的回收率;在pH=3的酸性体系中添加20 mg/L CMC,硫化铜镍矿浮选精矿镍品位提高至19.42%,回收率提高至60.05%;分别比同等条件下不添加CMC的浮选指标分别提高了1.78%和22.79%;CMC对蛇纹石矿泥选择性抑制是其优化硫化铜镍矿浮选过程的主要原因;浊度及表面动电位测试表明CMC加入量必须控制于20 mg/L以内,过量的CMC产生有团聚作用,不利于矿泥颗粒间的分散。     

Electrochemical flotation of ethyl xanthate-pyrrhotite system

1　INTRODUCTIONPyrrhotite(Fe1-xS ,0 相似文献   

Recent advances in electrochemistry of sulfide mineral flotation

1　ＥＬＥＣＴＲＯＣＨＥＭＩＳＴＲＹＯＦＦＬＯＴＡＴＩＯＮＩｔｉｓｎｏｗｏｖｅｒ 4 0ｙｅａｒｓｓｉｎｃｅＮｉｘｏｎｐｒｏｐｏｓｅｄａｎｅｌｅｃｔｒｏｃｈｅｍｉｃａｌｍｅｃｈａｎｉｓｍｔｏｅｘｐｌａｉｎｔｈｅｉｎｔｅｒａｃｔｉｏｎｏｆｔｈｉｏｌｆｌｏｔａｔｉｏｎｃｏｌｌｅｃｔｏｒｓｗｉｔｈｓｕｌｆｉｄｅｍｉｎｅｒａｌｓｕｒ ｆａｃｅｓａｎｄｐｒｏｖｉｄｅａｍｅａｎｓｏｆｒｅｃｏｎｃｉｌｉｎｇｔｈｅｄｉｆｆｅｒｅｎｔｔｈｅｏｒｉｅｓｔｈａｔｈａｄ ｐｒｅｖｉｏｕｓｌｙｂｅｅｎｒｅｓｏｌｕｔｅｌｙａｄ ｖ…     

浮选过程微泡生成机理研究进展

从微泡浮选理论出发,结合微泡浮选法研究中常见的五种方法:溶解气体浮选法、真空浮选法、射流浮选法、以及电解和超声波浮选法的微泡生成机制及优缺点。通过微泡浮选法处理微细粒矿物的可行性分析,认为微泡浮选法将是未来微细粒选别的重要手段,有广泛得应用前景。     

Mechanism and application on sulphidizing flotation of copper oxide with combined collectors

The effect of sodium butyl xanthate (NaBX) and dodecylamine (DDA) as combined collector on the sulphidizing flotation of copper oxide was investigated by flotation test, fluorescent pyrene probe, zeta potential, and infrared spectroscopy analyses. The micro-flotation results show that combined use of NaBX+DDA yields better effect than using NaBX at pH 7-11 only, and the optimal molar ratio of NaBX to DDA is 2: 1. The actual ores flotation shows that when the dosage of NaBX+DDA is (100+54) g/t, the copper concentrate grade and recovery are 15.93% and 76.73%, respectively. The fluorescent pyrene probe test demonstrates that the NaBX+DDA can reduce the micelle concentration in the pulp. The zeta potential and the infrared spectroscopy analyses indicate that chemical adsorption, hydrogen-bonding and electrostatic interaction can help to adsorb NaBX+DDA on the surface of malachite. Meantime, copper xanthate and copper-amine complexes may be generated during the adsorption process.     

Interaction and flotation of diaspore with alkylamine hydrochlorides

ＩＮＴＲＯＤＵＣＴＩＯＮＦｌｏｔａｔｉｏｎｉｓｏｎｅｏｆｔｈｅｍｏｓｔｖｅｒｓａｔｉｌｅｔｅｃｈｎｏｌｏｇｉｅｓｕｓｅｄｉｎｍｉｎｅｒａｌｐｒｏｃｅｓｓｉｎｇ .Ｔｈｅｓｅｐａｒａｔｉｏｎｏｆｍｉｎｅｒ ａｌｓｂｙｆｌｏｔａｔｉｏｎｈａｓｂｅｅｎｐｒｏｖｅｎｅｆｆｅｃｔｉｖｅｗｈｅｎｐａｒｔｉ ｃｌｅｓｔｏｂｅｆｌｏａｔｅｄｃａｎｂｅｍａｄｅｓｅｌｅｃｔｉｖｅｌｙｈｙｄｒｏｐｈｏ ｂｉｃ .Ｔｈｅｈｙｄｒｏｐｈｏｂｉｃｉｔｙｉｓｏｆｔｅｎｉｎｄｕｃｅｄｂｙｔｈｅａｄ ｓｏｒｐｔｉｏｎｏｆｃｏｌｌｅｃｔ…     

羟肟酸类捕收剂在中低品位铝土矿浮选中的性能研究

拜耳法氧化铝生产工艺已在我国大规模应用,其中铝土矿选矿是关键环节,而对于我国中低品位的铝土矿资源,需要研究一种更适合我国铝土矿选矿使用的浮选药剂.本文讨论了羟肟酸类捕收荆在中低品位铝土矿浮选中的应用与适用条件.分别用苯甲羟肟酸、对甲苯甲羟肟酸、1-羟基-2-萘甲羟肟酸三种物质作捕收剂进行了铝土矿浮选试验,得出了羟肟酸类捕收剂的浮选性能与pH值的关系,讨论了在适宜的pH值下三种药荆的浮选性能与药荆用量的关系.比较了三种药剂的浮选效果,并解释了三种药剂的浮选性能的差别.     

Recovery of molybdenum and copper from porphyry ore via iso-flotability flotation

A copper–molybdenum iso-flotability flotation process has been developed to efficiently improve the recovery of molybdenite from Duobaoshan porphyry Cu–Mo ores. The effects of flotation approach, type of collector, feed particle size distribution, rougher pH value and reagent dosage on the recovery of molybdenite were evaluated systematically. The results suggest that compared with kerosene and diesel oil, transformer oil has stronger dispersion capability in water media and better flotation selectivity for molybdenite, providing a higher molybdenum recovery under low reagent dosage. Moreover, compared with bulk flotation approach, the iso-flotability flotation approach using transformer oil as a collector can obtain superior Mo recovery (90.77%) and grade (0.80%) in the cleaner concentrate, and increase the Mo recovery and grade by over 18% and 5% in the final Mo concentrate, respectively. The results of commercial flotation further indicate that the iso-flotability flotation approach is a rational and effective route to beneficiate the porphyry Cu–Mo ores.     

Double reverse flotation process of collophanite and regulating froth action

A new double reverse flotation process was used to beneficiate the Yichang region collophanite of Hubei Province, China. Its final concentrate yield is 67.37%, P2O5 grade is 32.17%, P2O5 recovery is 87.80%, and the main impurities MgO, Fe203 and Al2O3 are 0.95%, 1.04%, 1.36%, respectively. The difficult problem was successfully solved that plentiful froths are bought by the cationic collector reverse flotation in collophanite beneficiation by adding inorganic froth regulator CA to the pulp. The defrothing mechanism was studied through mensurating surface tension and Zeta potential of the pulp after adding CA. It is found that the changing of surface tension and hoisting of Zeta potential may be the main reasons that froths become friable and break up.     

铝土矿反浮选脱硅研究综述

介绍了铝土矿反浮选脱硅的基本原理．技术关键以及国内外铝土矿反浮选脱硅的研究现状，并分析了发展趋势。     

选矿拜耳法氧化铝生产过程中有机物影响的分析与对策

在选矿拜耳法氧化铝生产过程中,采用了浮选方法处理我国中低品位一水硬铝石型铝土矿生产出A/S=10以上的选精矿,选矿使后续拜耳法生产流程的有机物量大大高于常规拜耳法,本文分析了有机物对后续拜耳法生产系统的影响,并提出了具体可行的解决对策。     

金属阳离子在锂辉石浮选中的活化行为及作用机理

在油酸浮选锂辉石体系中分别加入Ca^2+、Al^3+、Fe^3+离子,通过单矿物浮选试验、金属离子吸附量检测、金属离子水解组份浓度计算、矿物表面动电位测试、红外光谱检测以及量子化学模拟计算研究Ca^2+、Al^3+、Fe^3+离子对锂辉石浮选的活化行为和作用机理。结果表明:Ca^2+离子的最佳活化区间为pH大于12的强碱性条件,Al^3+离子的最佳活化pH为6.47,而Fe^3+离子的最佳活化pH为7.25;在这些pH区间内,锂辉石浮选回收率和金属离子吸附量均达到最大值。在锂辉石浮选过程中起活化作用的有效组份为它们分别对应的氢氧化物沉淀。Ca^2+、Al^3+、Fe^3+离子可使锂辉石表面动电位向正值方向显著偏移;Ca^2+离子在锂辉石表面双电层的外层发生静电吸附,Al^3+和Fe^3+离子在锂辉石表面双电层的内层发生特性吸附。钙原子与锂辉石矿物表面吸附后形成的Ca—O键的键强较小,以离子键为主;铁原子与矿物表面形成Fe—O化学键的键强较大,含有一定的共价键组份;而铝原子与矿物表面吸附后形成的Al—O键的键长、键强等参数介于钙、铁的参数之间。油酸在Ca^2+活化后的锂辉石表面发生了化学吸附和少量的物理吸附,而在Al^3+、Fe^3+活化后的锂辉石表面发生了较为强烈的化学吸附。     

旋流浮选器在铝土矿反浮选中的应用

为了解决铝土矿反浮选中微细粒浮选的难题,设计出一种旋流浮选器,利用流体动力学理论,通过模拟计算,建立旋流浮选器中铝土矿的分离粒度模型,推导出旋流浮选器应用于铝土矿反浮选的理论依据。对河南某铝土矿进行旋流浮选器浮选实验研究。结果表明:通过优化调整旋流浮选器的条件参数,不预先脱泥直接进行铝土矿反浮选,最终获得满足拜耳法对铝土矿生产要求的一水硬铝石精矿,精矿中平均A/S为8.38,回收率为85.16%。     

混合捕收剂浮选锂辉石的应用及作用机理

通过浮选试验,研究十二烷基磺酸钠、十二烷基硫酸钠、油酸、731、环烷酸皂,以及油酸与十二胺的混合捕收剂对锂辉石、长石和石英单矿物浮选行为及锂辉石实际矿石浮选指标的影响。借助Zeta电位、红外光谱分析、吸附量测试及量子化学计算,探讨混合捕收剂的作用机理。结果表明:油酸与十二胺的混合捕收剂,兼有捕收性和选择性好的特点,在碱性条件下能实现锂辉石与长石和石英的浮选分离。混合捕收剂在锂辉石表面的吸附量大于长石和石英。混合捕收剂中油酸在矿物表面以化学吸附为主,十二胺则以物理吸附为主。油酸离子分别与十二胺离子(或分子)和油酸分子以缔合形态存在,油酸的头基COO^-与锂辉石表面的Al原子发生化学作用。     

黄铁矿-卵清蛋白在浮选过程中相互作用的电化学研究

卵清蛋白(OVA),俗称鸡卵清白蛋白,是一种环保、无毒、廉价的表面活性剂。它的分子结构中含有电化学活性巯基。采用循环伏安法、红外光谱和浮选实验研究 OVA 在黄铁矿表面吸附以作为替代抑制剂。在宽的电位范围内和碱性pH值条件下,研究电化学条件对吸附机制和抑制率的作用。当OVA不存在时,可浮性在弱氧化电位条件下达到极大值。超出此电位范围,可浮性会由于生成 Fe 的氢氧化物以及亲水类的硫化物而降低。在整个测试电位范围内OVA?黄铁矿发生相互作用。OVA的抑制效果随着电位从还原电位、弱氧化电位,到黄铁矿的开路电位逐渐增加,这主要是由于OVA分子弱的构象变化以及开路电位下的疏水作用引起的。OVA的抑制率在中等氧化电位下达到极大值,这被称为静电引力。由于 OVA 以金属螯合物形式吸附,在较高的电位下这种高的抑制效果可以几乎一直保持下去。     

Recent development in researches of electrochemistry of sulphide flotation at Central South University of Technology

1　ＣＯＬＬＥＣＴＯＲＬＥＳＳＦＬＯＴＡＴＩＯＮ1.1　ＮａｔｕｒａｌｆｌｏａｔａｂｉｌｉｔｙＴｈｅｉｎｈｅｒｅｎｔｈｙｄｒｏｐｈｏｂｉｃｉｔｙｏｎｃｅｔｈｏｕｇｈｔｔｏｂｅｔｙｐｉｃａｌｏｆｓｕｌｆｉｄｅｓ[1] ｉｓｎｏｗｔｈｏｕｇｈｔｔｏｂｅｒｅｓｔｒｉｃｔｅｄｔｏｓｕｌｆｉｄｅｓｓｕｃｈａｓｍｏｌｙｂｄｅｎｉｔｅａｎｄｏｔｈｅｒｍｉｎｅｒａｌｓｏｒｃｏｍｐｏｕｎｄｗｉｔｈｓｐｅｃｉａｌｓｔｒｕｃｔｕｒａｌｆｅａｔｕｒｅｓ .Ｍｉｎｅｒａｌｓｓｕｃｈａｓｍｏｌｙｂｄｅｎｉｔｅ ,ｏｒｐｉｍｅｎｔ ,ｒｅ…