回水对湖北低镁高铁铝磷矿双反浮选的影响

湖北宜昌地区低镁高铁铝磷矿P_2O_5品位为24.35%,MgO质量分数为1.18%,倍半氧化物R_2O_3质量分数为6.49%,经1粗2扫选硅反浮选和1粗1扫选镁反浮选流程选别后,可获得P_2O_5回收率75.96%,P_2O_5品位34.68%、MgO质量分数0.62%、R_2O_3质量分数2.07%的优质磷精矿。混合回水试验中选硅段泡沫流动性好,综合精矿(精矿和中矿)指标稳定,P_2O_5品位保持在34%以上,P_2O_5收率维持在75%左右。新型双反浮选流程技术指标稳定,回水利用率高。     

云南某碳酸盐型胶磷矿双反浮选脱硅工艺流程探讨

在云磷集团450万t/a浮选厂昆阳150万t/a系列单一反浮选工艺流程基础上,为进一步降低浮选磷精矿中SiO_2的含量,对3种不同的双反浮选脱硅(先脱镁再脱硅、先脱硅再脱镁、脱镁-分级-脱硅)工艺流程进行了对比试验,结果表明,脱镁-分级-脱硅工艺流程脱硅效果好,药剂消耗低,精矿指标(精矿P_2O_5品位为30%、MgO品位为0.71%、SiO_2品位为13.71%、P_2O_5回收率为82.13%)达到了预期要求,且脱硅浮选泡沫较脆,易于调控,因此推荐采用该流程。     

胶磷矿反浮扫选试验研究

某胶磷矿反浮粗选尾矿P_(2)O_(5)品位为18.99%、MgO质量分数为8.37%,由于反浮粗选尾矿的P_(2)O_(5)品位较高,因此需通过扫选提高最终精矿的产率和P_(2)O_(5)回收率。通过试验确定的扫选最佳工艺条件为:浮选矿浆质量分数25.15%、抑制剂用量0 kg/t、调整剂用量3 kg/t、捕收剂用量0.3 kg/t、浮选时间7 min。在此最佳工艺条件下进行了验证试验,获得了P_(2)O_(5)品位为28.32%、MgO质量分数为1.01%、产率为46.31%、P_(2)O_(5)回收率为67.71%的稳定扫选精矿指标。     

贵州某钙镁质胶磷矿选磷降镁反浮选试验研究

针对贵州某中低品位钙镁质胶磷矿的特点,对其进行了选磷降镁的反浮选试验研究。结果表明,采用1粗1精反浮选工艺流程,在磨矿细度-0.074mm占75.80%,抑制剂硫酸用量为14kg/t,捕收剂用量为800g/t,浮选温度为常温的条件下,获得了P_2O_5品位为33.62%、MgO质量分数为0.91%、P_2O_5回收率为85.93%、MgO脱除率为90.78%的磷精矿,实现了胶磷矿与白云石的有效分离。     

云南海口某中低品位胶磷矿双反浮选工艺研究

云南海口某中低品位胶磷矿属于硅钙质磷块岩,其P_2O_5品位(质量分数,下同)为18.14%,MgO品位为7.20%,SiO_2品位为15.87%。在磨矿细度为0.074 mm占92.69%的条件下,采用"一粗一精一扫反浮选脱镁、一次反浮选脱硅"的双反浮选工艺进行试验,获得P_2O_5品位为28.89%,MgO品位为0.90%,SiO_2品位为15.93%,P_2O_5回收率为78.14%的精矿。     

云南某反浮选脱镁磷精矿再反浮选脱硅降MER值试验研究

随着钙质胶磷矿资源的不断消耗,入选的胶磷矿中P_(2)O_(5)和MgO含量持续降低,SiO_(2)含量持续升高,使用目前成熟的单一反浮选脱除MgO工艺生产的磷精矿存在P_(2)O_(5)含量降低,SiO_(2)杂质和MER值升高的问题。为了解决此问题,以反浮选脱镁磷精矿为原料对研发的酸性条件下再反浮选脱硅捕收剂开展了药剂用量、pH适应性及浮选低温耐受性试验,结果表明,该脱硅捕收剂具有较好的pH适应性和低温耐受性,对降低磷精矿SiO_(2)含量和MER值以及提高最终磷精矿品质有明显作用。     

一种混合型钙质磷块岩的浮选工艺研究

针对高碳酸盐混合型钙质磷块岩,通过不同浮选工艺对比研究,确定合理的选矿工艺流程:正浮选1粗—反浮选1粗1精和部分尾矿再选,获得了P_(2)O_(5)品位为30.18%、MgO质量分数为0.81%、产率为57.82%、P_(2)O_(5)回收率为84.62%的磷精矿指标,可为难选磷块岩的选矿提供借鉴。     

贵州某磷矿反浮选工艺的优化

针对贵州某P_2O_5品位为25.78%、MgO质量分数6.26%的磷矿原矿进行脱镁研究,采用公司生产的新型浮选药剂通过"1反1扫"的工艺流程和对比实验,获得了精矿P_2O_5品位34.63%,回收率94.67%,精矿MgO质量分数为0.81%的分选指标,所得精矿达到了优级品要求,为该磷矿的产业化开发利用提供了参考。     

含稀土高镁中低品位胶磷矿反浮选试验研究

针对贵州织金含稀土高镁中低品位胶磷矿,采用自制脱镁捕收剂AB进行了反浮选脱镁富磷试验研究。结果表明,采用1粗2精反浮选闭路流程,在磨矿细度为-0.074mm质量分数占84.68%、抑制剂硫酸用量为18kg/t、捕收剂AB用量为900g/t的条件下,获得了P2O5品位为32.70%、P2O5回收率为82.59%、MgO质量分数为1.39%、MgO脱除率为91.62%、REO品位为0.137%、REO回收率为94.53%的精矿指标。试验结果可为该类含稀土磷矿资源的合理开发利用提供借鉴。     

湖北某中低品位胶磷矿反浮选脱镁试验研究

以湖北某中低品位高镁胶磷矿(P₂O₅品位19.37%,MgO质量分数9.90%)为研究对象,采用自制的新型反浮选脱镁捕收剂HLF,在25℃条件下进行单一反浮选试验,结果表明：在磨矿细度为-0.074 mm占70%、磷酸用量为18 kg/t、捕收剂HLF用量为1.6 kg/t的最佳条件下,得到了精矿品位为30.64%、回收率为82.05%、选矿效率为33.17%的良好浮选指标。精矿产品多元素分析和扫描电镜能谱分析结果显示,氟磷灰石与白云石实现了较好的分离。浮选优化试验结果表明,用硫酸替换磷酸作为抑制剂可达到同样的浮选效果,且能降低选矿成本。通过对比HLF和油酸钠单一反浮选脱镁指标,发现HLF相比油酸钠有更为优异的反浮选脱镁性能。研究成果可为中低品位胶磷矿的浮选研究提供借鉴。     

浮选柱在磷矿选矿中的应用研究

采用浮选柱设备进行磷矿的选矿实验研究。通过化学法分析磷矿的矿物特性,采用浮选柱分选技术,开展磷矿精选试验。结果表明,在充气量为6～10 L/h,冲洗水2～3 L/h可以得到w(P2O5)=30%以上的磷精矿。     

塑料浮选

塑料浮选主要针对密度相近。荷电性质相近的废旧塑料之间的分选，塑料浮选方法可以分为控制液气界面张力的γ浮选，等离子体表面改性的物理调控浮选和表面活性剂吸附的化学调控浮选三类，有关化学调控浮选的润滑机理及塑料浮选药剂的研究备受重视。     

黄药类捕收剂在高硫铝土矿浮选除硫中的应用比较

比较了乙黄药、丁黄药和异丁黄药3种浮选剂对高硫铝土矿浮选除硫的性能,着重考察了浮选剂用量、浮选时间、浮选矿浆浓度、pH值及矿石粒度对浮选除硫率和氧化铝回收率的影响.一次精选结果表明,乙黄药对于高硫铝土矿浮选除硫药剂用量和浮选时间的要求比较高,且氧化铝的回收率不高于90%;丁黄药和异丁黄药浮选除硫能力强,氧化铝回收率均高于90%,对浮选药剂用量和浮选时间等参数的要求也不高,较适合用于铝土矿浮选除硫的工业化生产.丁黄药和异丁黄药一步精选开路实验表明,异丁黄药具有较高的选择性,丁黄药具有较强的捕收能力.     

Improvement of the Flotation Selectivity in a Mechanical Flotation Cell by Ultrasound

In this study, the effect of ultrasound on froth and pulp phases has been investigated in the flotation of two different ore samples, namely barite and chalcopyrite. In order to determine the overall flotation rate constants at various froth depths, incremental recoveries obtained from the flotation tests with and without ultrasound were fitted to a first-order rate equation. Thus, the recoveries of froth and pulp phases were calculated.

The use of ultrasound speeded up the bubble coalescence and therefore reduced the froth phase recovery in the ultrasonic flotation of both barite and chalcopyrite. In addition, the results indicate that there is a considerable effect of ultrasound on the pulp phase recovery in the chalcopyrite flotation whereas no significant differences in the separation performance were obtained from the ultrasonic flotation of barite with and without ultrasound. The results also indicate that a pronounced selectivity effect was obtained from the ultrasonic flotation of both barite and chalcopyrite. The use of ultrasound in the froth remarkably improves the quality of the chalcopyrite concentrate, especially at the shallow froths. Therefore, either effective pulp volume can be increased without sacrificing the separation selectivity or the pulp density can be decreased to obtain better product quality at shallow froths in the ultrasonic flotation of chalcopyrite.     

Flotation of metal hydroxide precipitates. I. Flotation of copper hydroxide

Flotation of copper hydroxide precipitate has been investigated at total initial copper concentration 10^?2M with sodium dodecylbenzenesulphonate (DBSNa) and dodecyldimethylbenzylammonium bromide (DDMBABr), both at initial concentration 10^?4M. In particular, granulometric analysis of the precipitate and measurement of its electrokinetic potential were carried out over a wide range of the acidity of aqueous precipitate suspension in order to establish essential factors governing flotation of the precipitate. Moreover, adsorption of the flotation collectors by the precipitate as well as the rate of precipitate sedimentation were measured. The cationic collector (DDMBABr) neither influenced the electrokinetic potential of copper hydroxide precipitate nor adsorbed on its surface. Consequently, no flotation of copper hydroxide was observed with (DDMBABr). On the other hand, the anionic collector (DBSNa) influenced the electrokinetic potential of copper hydroxide within the same pH range where adsorption of DBSNa on the precipitate was observed and flotation was effective. The rate of flotation varied with the pH of the aqueous suspension. This dependence was irregular and presumably governed by the aggregation of precipitate grains since the rate of flotation increased with the size of the aggregates.     

Dissolved-Air Flotation of Metal Ions

Abstract

Metal ions (copper, nickel, zinc, and ferric ions) were separated from dilute aqueous solutions by dissolved-air flotation. The ions were either precipitated as sulfides or floated (as ions) by xanthates. Copper and nickel were selectively separated; promising results were obtained with single, binary, and ternary mixtures. The effect of several parameters (solution pH, addition of chemical reagents at varying concentrations, and the presence of other ions) on the removal of ions was studied. The collectorless flotation of copper ions was also investigated.     

The Collector Mechanism in Flotation

Abstract

This is a critical review of the research on the collector mechanism carried out during the last ten years. The work has been reviewed in three parts. The first part is concerned with the studies on the collector mechanism in sulfide minerals. The discussion centers on the collector action of xanthates and dixanthogens. The nature of the adsorbed film is discussed in the light of recent studies by infrared spectroscopy, electron diffraction, adsorption and calorimetric measurements. The influence of oxygen on the adsorption of xanthate on sulfide minerals is discussed and a critical evaluation made of the evidence for and against the theory that the presence of oxygen is crucial to the formation of a hydrophobic film at the sulfide mineral surface conditioned with xanthate. Recent studies on the stability of the adsorbed collector film are reviewed and correlated with the theories of the collector action of xanthates. The influence of modulating agents, activators, and depressants on the collector action of xanthates on pyrite, pyrrhotite, and marmatite are discussed. Finally, the collector action of xanthates on oxidized lead and zinc minerals has been reviewed and the known basic differences between the nature of the adsorbed species on these minerals and that on sulfide minerals is discussed. The collector mechanism in nonsulfide minerals is reviewed for the following groups of minerals: oxides, silicates, and alumino-silicates, polar salt-type minerals containing alkaline earth metal cations and soluble salts. The collector mechanism of anionic as well as cationic reagents is reviewed in conjunction with the action of modifying agents. The possibilities of employing chelating agents as mineral collectors for nonsulfide minerals are examined. The recent electrokinetic studies on nonsulfide systems in relation to the electrical double layer and nature of the adsorbed species is discussed in detail. In the third part certain new aspects of the collector mechanism, namely the role of impurities and nonstoichiometry of the mineral samples, are discussed. The possibility of controlling the floatabilities of minerals by incorporating impurity centers is examined. Finally, the kinetic factors affecting the collector mechanism are discussed.     

Flotation Mechanisms of Boron Minerals

Abstract

The development of reagent strategies for the flotation of boron minerals requires an understanding of flotation chemistry of reagent/mineral interactions. The floatability of a typical boron mineral, colemanite, was investigated in a microflotation cell by using anionic and cationic surfactants as collectors and tannic acid as a depressant. The results obtained with zeta potential measurements together with flotation tests reveal that colemanite is floatable with both anionic and cationic surfactants at its natural pH of 9.3. While the floatability of colemanite with anionic surfactants decreases with increasing pH, that with a cationic surfactant exhibits a maximum at pH 10.2, indicating the major role of electrostatic interactions in the system.