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通过对某难处理含铜金矿的选矿试验，确定了适合该矿性质的浮选－氰化选矿工艺，获得了满意的金回收率，同时对该工艺中影响金回收的主要因素进行了讨论。 相似文献
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随着矿产资源开发利用程度的逐年加剧,目前大部分有色金属选厂处理的都是品位低、嵌布粒度细的复杂多金属矿,为提高有价金属的选矿回收率、降低磨矿成本,大部分选厂都采用"阶段磨矿、阶段选别"工艺,其中以浮选粗精矿的再磨最为常见.硫化矿浮选粗精矿的再磨可显著提高磨矿效率及目的 矿物解离度,但生产实践中大部分选厂仅关注目的 矿物的解离度,而忽视了硫化矿浮选粗精矿再磨过程中磨矿介质、磨矿方式、矿浆电化学环境等多种因素对矿物表面性质及浮选行为的影响.文章系统总结了硫化矿浮选粗精矿矿物组成特点及矿浆化学性质的基础上,综述了硫化矿浮选粗精矿再磨过程中磨机类型及磨矿方式、磨矿介质材质及形状、矿浆电化学环境、药剂浓度等多种因素对再磨后矿物表面性质及浮选行为的影响规律,指出通过精矿再磨工艺参数及矿浆电化学环境的合理优化调整,增强矿物表面间的亲水/疏水性差异,提高精选分离效果应是未来硫化矿浮选粗精矿再磨研究关注的重要方向. 相似文献
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贵州都匀牛角塘氧化锌矿石的浮选研究 总被引：3，自引：0，他引：3
作者简述了都匀牛角塘氧化锌矿石的物质成分及其特性，介绍了浮选试验的工艺流程及指标，由于合理地解决了浮选顺序、氧化矿的硫化及矿泥的不良影响，分选效果较好。文中初步分析了以上几个主要工艺因素对选别影响的机理。 相似文献
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微细粒低品位锰矿由于颗粒间的非选择性聚集、浮选药剂用量大、浮选效率低等技术难题而致使其利用困难,造成大量浪费。在品位低于13%的锰矿浮选技术研究中,捕收剂最受关注,前人已研究了多种类型的捕收剂,所得精矿品位在16.9%~18.3%之间,回收率为56%~97%,回收率比较理想,但精矿品位总体不高。本文将新型捕收剂RA-92应用于湖南凤凰-花垣地区低品位碳酸锰矿(锰品位为10.7%)的选矿工艺中,实验研究了磨矿细度、pH值、抑制剂和捕收剂用量对浮选效果的影响,在最佳工艺条件下,精矿品位由原矿的10.7%提升至17.4%,回收率达到80.2%。研究表明RA-92对碳酸锰矿具有良好的捕收性能,浮选工艺相对简单且捕收剂用量少,浮选成本较低,可为此种捕获剂在微细粒低品位碳酸盐锰矿选矿中的应用得到推广。 相似文献
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近几年来对硅钙质胶磷矿采用反正浮选或正反浮选流程的试验研究有了很大突破,克服了单一正浮选磷精矿质量低、磨细度要求高等缺点。根据保康磷矿的反正浮选试验实践和安宁等几个磷矿的试验结果,表明以反浮选为基础流程的工艺是硅钙质胶磷矿矿石性质所决定的。采用此工艺具有矿浆浮选温度低、磨矿粒度较粗、工艺简单且操作稳定、精矿易过滤且尾矿易沉降、精矿质量高等5大特点。此工艺流程易于实现工业化。 相似文献
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针对江西× ×难选胶磷矿,采用单一正浮选工艺进行试验.试验对各主要影响因素逐一研究分析,获得了最佳药剂制度,并在此基础上有针对性的进行了三组闭路试验,均获得了较满意的选别指标,满足了选矿厂的不同需求.研究结果为该胶磷矿的开发利用提供了技术支持. 相似文献
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The change in collectorless flotation of sphalerite with pH and Cu(II) concentration was correlated with the type and proportion of species present on the sphalerite surface. The solution and surface species were determined using a combination of analytical techniques including zeta potential measurement and X-ray photoelectron spectroscopy. An optimum copper concentration for maximum sphalerite flotation was identified, beyond which flotation decreased. This decrease in flotation coincided with the precipitation of copper hydroxide in neutral to mildly alkaline pH conditions. The hydrophobic polysulfide and hydrophilic copper hydroxide species were the main surface species influencing sphalerite flotation. 相似文献
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J.C.A. Green 《International Journal of Mineral Processing》1984,13(2):83-103
The generalised optimisation of a flotation network is studied by means of using variable connections (structural parameters) and variable enhancement factors which are used instead of a flotation model to describe the separation process. The enhancement factors are functions of variables affecting the flotation process. These functional relationship may be derived by means of using a flotation model. Bounds are placed on the enhancement factors by means of either using a flotation model or by inspection of existing pilot or commercial plant data. These bounds, together with external, system and mass balance constraints and an appropriate objective function, define the general optimisation problem for a flotation network.The optimisation problem above may be solved by non-linear programming methods, however, it is easily transformable into a Linear Programme which is easy to solve. The procedure has been applied to a flotation circuit comprising three banks of cells for which an optimal set of connections and enhancement factors has been computed for varying constraints.A simulation procedure based on a gamma flotation model has been applied to one of the optimal circuits so as to compute the flotation variables. 相似文献
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Susana Brito e Abreu William Skinner 《International Journal of Mineral Processing》2011,98(1-2):35-41
Particle hydrophobicity has been derived from Time of Flight Secondary Ion Mass Spectrometry (ToF-SIMS) measurements and its impact on the flotation behaviour of chalcopyrite investigated. Batch flotation tests were performed using a dithiophosphate-type of collector in different concentrations. Three flotation regimes were studied using particle size ranges of 20–38 μm, 75–105 μm and 150–210 μm. The individual particle contact angle, and hence, the distribution of contact angles of chalcopyrite within feed, concentrate and tail flotation samples has been determined using ToF-SIMS secondary ions. The effects of particle size and hydrophobicity on the flotation behaviour have been investigated using this new approach. The hydrodynamic effects of the particle size were highlighted by the different distributions of contact angles obtained for each concentrate size fraction, with fine and coarse sizes requiring higher average contact angles to float. This effect was overtaken by hydrophobicity when a high collector concentration was used. The broad distribution of contact angles observed in all samples, i.e. heterogeneity in hydrophobicity, has significant consequences for interpreting flotation behaviour. The methodology of analysis conducted in this study was applied to real ore and can be used as a quantitative, diagnostic tool for examining surface chemical factors affecting hydrophobicity. This new technique has promise and may advance the understanding of mechanisms, which may lead to better control strategies for improving flotation performance. Furthermore, any mineral–collector system can be targeted, provided appropriate calibration is performed. 相似文献
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Batch flotation tests on low- and high-rank Australian coals showed that it was difficult to reduce the original ash yield substantially whilst maintaining high recovery. The ash yield of the flotation concentrates was found to be mainly the result of the recovery of composite coaly grains containing both carbonaceous matter and mineral matter. Even 50 μm grains were composite in nature, the mineral matter being very finely disseminated. Separation of the flotation products using the heavy-liquid density-gradient technique showed that flotation recovery of coaly grains of a given size decreased with increasing relative density of the grains. The effect was much greater for coal of low rank. The fall in recovery correlated with an increase in the proportion of hydrophilic mineral matter in the composite grains, rather than with the changing proportions of the macerals vitrinite and inertinite. 相似文献
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S.K. Mishra 《International Journal of Mineral Processing》1982,9(1):59-73
Calcite is generally associated with apatite minerals in phosphate deposits. To explore the possibility of separating these minerals by a soap flotation technique, their electrokinetic properties and flotation behaviour were studied in the presence of sodium oleate.Microelectrophoresis data indicate oleate adsorption on these minerals, and from Hallimond-tube flotation tests it has been noted that in a controlled pH environment and for a certain sodium oleate concentration range, separation of these minerals is possible.The study of apatite/calcite-sodium metasilicate-sodium oleate systems indicates the preferential adsorption of silicate at the calcite surface. This suggests the potential use of sodium metasilicate as the modifying agent for the separation of apatite from calcite by depressing calcite when using sodium oleate as collector. 相似文献
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P.T.L. Koh F.P. Hao L.K. Smith T.T. Chau W.J. Bruckard 《International Journal of Mineral Processing》2009,93(2):106
The effect of particle shape on the flotation process has been investigated in laboratory experiments with monosized spherical ballotini and ground ballotini. The particles were treated by partial methylation with trimethylchlorosilane to achieve varying degrees of hydrophobicity. In flotation, the process of film thinning and liquid drainage is critical in the formation of stable bubble–particle attachments and this is affected by the particle shape and surface hydrophobicity. Flotation tests with different particle sizes were conducted in a modified batch Denver cell. Predictions from a computational fluid dynamic model of the flotation cell that incorporates fundamental aspects of bubble–particle attachment were compared with data from flotation tests. Contact angles of the particles were measured using a capillary rise technique to indicate surface hydrophobicity. Ground ballotini generally has higher flotation rates than spherical ballotini; the results are consistent with effects from faster film thinning and rupture at rough surfaces and are well correlated by the sphericity index. 相似文献
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A.-Z.M. Abouzeid A.T. Negm D.A. Elgillani 《International Journal of Mineral Processing》2009,90(1-4):81-89
Sedimentary phosphates contain-besides the phosphate minerals-, various associated gangue minerals such as: clays, silica, calcareous minerals (mainly calcite and dolomite), carbonaceous matter, iron oxides and/or pyrite. The common practiced flow-sheets for concentrating these types of phosphate ores consist of a combination of various mineral processing units such as: crushing and screening, attrition, washing, magnetic separation, and/or flotation. However, none of these combinations was successfully efficient to upgrade the calcareous ores because of the close similarity of the physical properties (density, particle size, particle shape, etc.) as well as the surface physico-chemical properties of the carbonate and phosphate minerals. For the last five decades extensive efforts have been spent to adopt flotation for separating carbonates from phosphate ores. These efforts include thermodynamic analysis, modification of the technique, controlling the pulp environment, and finding new reagents that can specifically differentiate between carbonates and phosphates.This paper reviews some of the published work on the separation of carbonates from phosphate ores by flotation and presents the flotation results of phosphate ore samples different in their physical properties and mineralogical composition. The results obtained reflect the effect of ore nature on the flotation performance and the reagents consumption. 相似文献
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Mohamed A. El-Assar Abdel-Monem T. Abdel-Hameed Esam Zahran Maged El Osta 《Arabian Journal of Geosciences》2017,10(22):491
The Late Cretaceous (Campanian-Maastrichian), low-grade phosphorite sequence of East Sibaiya, Aswan area, which is known as the Duwi (phosphate) or Sibaiya Formation, is usually intercalated with marl, oyster limestone, and chert beds. These strata, which crop out in a generally east–west trending belt spanning the middle latitudes of Egypt, are phosphorite-rich sediments and of great economic importance. Representative samples were collected from the investigated area at several localities (e.g., Umm Tundubah-2 and Wadi El-Batur) and 200 kg of phosphate rocks was used for upgrading processes of low-grade phosphorites of the East Sibaiya area. The upgrading processes included two techniques: the first technique (gravity separation) comprises crushing, sieving, gravity separation by a shaking table, and magnetic separation. This technique raised the P2O5 in the head sample from 24.73 to 31.91% as a phosphate concentrate. The second technique (flotation technique) depends on certain flotation parameters such as pH, grain size, and phosphate collector dose (i.e., oleic acid). The flotation technique increased the P2O5% from 24.73 to 31.16% as a final product of the phosphate concentrate. These data were confirmed by X-ray fluorescence analyses of major elements. 相似文献
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Acta Geotechnica - Grouting is an important and convenient technique to improve rock properties. The grouting effectiveness depends on quantities of complex influencing factors. The investigation... 相似文献
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A simple technique, based upon interpolation and mass balancing, is proposed for minimizing the error propagation in the estimation of the flotation recovery of size-liberation particle classes. Liberation data obtained by a down-the-bank survey is used to illustrate application to industrial cells. 相似文献