共查询到19条相似文献,搜索用时 109 毫秒
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针对硅孔雀石天然可浮性差,表面多孔和高孔隙度,性质变化不均匀,并且亲水性强,难溶解的特性,通过XRD、SEM检测硅孔雀石原矿性质和表面形态,核心地提出了硅孔雀石改性高分子聚合物吸附-中间金属铜离子联接-捕收剂吸附的试验方案.高分子活化剂通过对硅孔雀石表面有机改性,使其能够吸中间金属铜离子,在硅孔雀石浮选改性中起着至关重要的作用.通过硫酸铵、乙二胺磷酸盐、高分子药剂实际浮选试验情况分析对比,发现高分子药剂和硫酸铵共同使用时试验效果最好,最终硅孔雀石的回收率达到了86.9%的良好指标. 相似文献
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用孔雀石制铜盐,虽然有人做过研究,但因我国铜矿资源分布较广且品位和组成悬殊亦大,而且所需制备的铜盐亦不相同,任何一法难能尽善尽美。我们对孔雀石制备碱式硫酸铜进行了试验研究,完成了实验室小试工作。 相似文献
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反射炉炼铜渣回收铜技术探索 总被引:1,自引:0,他引:1
在铜熔炼反射炉渣中铜铁赋存状态分析基础上,采用常规选矿和火法贫化工艺对反射炉水淬渣进行回收铜技术探索.研究结果表明,水淬渣含1.06%铜和36.41%铁,铜、铁、硅矿物紧密共生,相互交织,铜矿物的结晶粒度多数低于5 μm,在Na2S用量800 g/t、混合捕收剂用量240 g/t、浮选时间6 min、磨矿细度95%为-0.074 mm矿浆浓度30%的浮选条件下,渣精矿品位4.54%,回收率达64.65%,常规选矿工艺难奏效.吹炼转炉渣返回贫化作业会导致反射炉渣含铜较高,添加一定量黄铁矿精矿,采用热渣排放方式能有效降低渣含铜. 相似文献
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针对以硅孔雀石为主的高结合率、高钙镁难处理铜矿的进行了酸浸动力学研究,考察了温度、硫酸浓度、搅拌强度和矿石粒径对铜浸出率的影响.结果表明:铜浸出率随温度和硫酸浓度的增大而提升,搅拌强度对铜浸出率影响较小,铜浸出率随矿石粒径的减小先增大后减小,这可能是由于原矿钙镁含量高,当磨矿细度过细钙镁充分解离,一旦矿石和硫酸接触,钙镁和硫酸迅速反应消耗大量的酸,导致铜的浸出率降低.采用SEM-EDS和XRD对浸出前后矿样进行表征,结果表明碳酸钙与硫酸反应生成硫酸钙沉积在颗粒表面形成固态产物层,阻碍浸出反应.动力学分析表明该浸出过程受固态产物层扩散控制,反应表观活化能为11.43 kJ/mol. 相似文献
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本文制定了含自然铜矿石的加工粉碎流程。考查了若干浸出剂对自然铜、硅孔雀石、孔雀石和辉铜矿的分相效果;并建立了测定它们的化学物相分析方法。 相似文献
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The experiments of agitation leaching were carried out in aqueous ammonia/ammonium carbonate solution, to recover copper from the flotation tailings of waste copper oxide residue. The main copper minerals contained in the flotation tailings are chrysocolla, malachite, and cuprite, with the copper grade of 1.12%. Effects of lixiviant concentration, solid‐to‐liquid ratio, stirring speed, and reaction temperature on copper leaching ratios at various time were investigated. It is found that the leaching ratio almost cannot be affected by time after 90 min of leaching. The optimised processing conditions have been determined, under which the leaching ratio of 70.6% is obtained. Kinetics analysis indicates that the copper leaching ratio is controlled by diffusion through the product layer in the initial 60 min of leaching, and corresponding measures to strengthen the copper extraction is proposed, with the activation energy of 32.3 kJ/mol. © 2012 Canadian Society for Chemical Engineering 相似文献
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U. Würzburger 《Israel journal of chemistry》1970,8(3):443-458
Timna' chrysocolla was divided into several types based on two end members differing in water content, specific gravity, CuO:SiO2 ratio and apparently also in their DTA behaviour. The chrysocolla replaces quartz. In places an intergrowth of chrysocolla and wilkeite was observed by electron probe scanning. The X-ray diffraction pattern of chrysocolla is rather poor; however diffraction patterns were obtained after controlled heating (DTA). These indicated the crystallization of tenorite, cuprite, quartz and cristobalite. Dioptase, plancheite and bisbeeite were also identified by X-ray diffraction. Several possibilities of chrysocolla genesis are discussed. 相似文献
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响应曲面法优化氧化铜渣浮选提铜工艺 总被引:4,自引:0,他引:4
江西某炼铜炉渣含铜量高,具有较高的经济价值。由于该铜渣中铜矿物以氧化矿为主,且硫化矿表面被氧化,直接浮选铜回收率低、经济效益差。通过添加活化剂,活化氧化铜矿物,并利用响应曲面中心复合设计原理对浮选工艺条件进行优化,研究氧化钙、硫化钠、Z-200对浮选效果的响应。结果表明,Z-200用量是影响精矿品位和回收率的主要因素,且各响应因素间存在交互效应,在CaO用量为25 g/t,Na2S用量为500 g/t,Z-200用量为100 g/t的最优条件下,闭路试验获得精矿平均品位12%,精矿铜回收率为86.57%,采用该浮选优化工艺能获得较好的回收效果。 相似文献
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The kinetic properties of nickel supported on chrysocolla (CHR) and nickel—copper mixtures supported on silica were measured by steady-state kinetics (carbon monoxide hydrogenation), temperature-programmed desorption (carbon monoxide, hydrogen), and temperature-programmed reaction (carbon monoxide and carbon hydrogenation). Leached chrysocolla, a silica-like material containing 7.1% copper, is shown to be an effective catalyst support; NI/CHR has methanation activity and adsorption properties (hydrogen, carbon monoxide) that are similar to Ni/SiO2. The Ni/CHR catalyst has a much higher selectivity to methane formation, however, and a lower activation energy. The copper in the CHR support does not appear to affect the catalyst properties and thus apparently does not interact with the nickel. Copper in CuNi catalysts decreases the turnover number for methanation, the amount of hydrogen adsorption, the strength of hydrogen binding to the surface, and the rate of carbon monoxide disproportionation. Copper also increases higher hydrocarbon selectivity at higher temperature, though the temperature at which this occurs depends significantly on the support. The rate of carbon hydrogenation, however, is relatively independent of the presence of copper. Good agreement was obtained between carbon monoxide hydrogenation kinetics measured by steady-state reaction and by temperature-programmed reaction. 相似文献
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《分离科学与技术》2012,47(12-13):1033-1046
Abstract The precipitate flotation of copper and zinc as sulfides in dilute aqueous solutions (50-250 ppm metal ion concentration) was investigated in the laboratory in continuous flow. The dispersed-air flotation technique was followed, leading to a selective recovery of copper sulfide of the order of 95% in a high acidic pH region (of 1.7) by a laurylamine ethanolic solution as collector and with the addition of cetyl-pyridinium chloride as frother. The precipitate flotation of zinc sulfide was then accomplished with the same method at pH 5.0 as a second separation stage (in the presence of minor amounts of copper). 相似文献
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针对利国铁矿铜金选厂铜精矿回收率偏低的生产情况,在借鉴同类矿山成功经验和选矿试验基础上,对该选厂进行了浮选工艺和浮选药剂的技术改造,改造后钢精矿品位提高3.31%,回收率提高5.17%,黄金回收率提高4.15%. 相似文献