共查询到19条相似文献,搜索用时 101 毫秒
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采用单矿物浮选试验研究了金红石在油酸钠和胲铵类药剂组合体系中的浮选行为,利用zeta电位、表面张力、接触角、紫外光谱等手段从界面化学角度详细研究了组合药剂在液液、液固界面的作用机制。结果表明:单一药剂对金红石捕收能力的大小顺序为:油酸钠(SO,51.55%)>N-亚硝基萘胲铵(CF,18.72%)>N-亚硝基苯胲铵(NF,14.01%)。组合药剂添加顺序对金红石回收率的影响大小为:先添加N-亚硝基苯胲铵后油酸钠>先添加油酸钠后N-亚硝基苯胲铵>油酸钠和N-亚硝基苯胲铵预混后再添加>油酸钠和N-亚硝基萘胲铵预混后再添 加>先添加油酸钠后N-亚硝基萘胲铵>先添加N-亚硝基萘胲铵后油酸钠,该顺序与药剂之间的协同效应指数有较好的一致性。油酸钠分子中的双键与胲铵类分子中的苯环和萘环之间存在电子共轭效应,该效应对组合药剂的吸附特性及缔合行为有较大影响,药剂之间所生成缔合物的数量及空间构象是影响金红石浮选行为的主要原因。 相似文献
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研究了氯化钠和四丁基溴化铵分离金的行为及与一些金属离子分离的条件。实验结果表明,当溶液中氯化钠和四丁基溴化铵的浓度分别为2.5×10-3mol/L和4.0×10-4mol/L时,Au(Ⅲ)可与Ga(Ⅲ)、Co(Ⅱ)、Pd(Ⅱ)、Zn(Ⅱ)、Rh(Ⅲ)、Al(Ⅲ)、Cd(Ⅱ)、Ce(Ⅳ)、Fe(Ⅲ)、Ru(Ⅲ)、Cu(Ⅱ)、W(Ⅵ)、Ti(Ⅳ)、Pb(Ⅱ)、Sb(Ⅲ)、V(Ⅴ)、Pt(Ⅳ)、Mn(Ⅱ)I、n(Ⅲ)、Sn(Ⅳ)、Ni(Ⅱ)I、r(Ⅳ)和Cr(Ⅲ)离子定量分离,对合成水样中Au(Ⅲ)的分离和测定,结果满意。 相似文献
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试验结果表明,选前脱泥对提高原矿品位,改善浮选环境、降低药耗和提高低品位细粒嵌布金红石的选矿回收率至为重要。试验发现,浮选药剂的选用和药剂间的组合搭配,对浮选结果影响也很大。中间试结果表明所选用的浮选工艺是合理的。 相似文献
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通过系统试验,用筛选出的最佳晶型转化剂直接加入到硫酸氧钛水解的产物中,在最佳工艺条件下,经过煅烧和处理后,可生产出金红石型钛白粉。该工艺可为传统硫酸法制取钛白粉技术改革提供重要依据。 相似文献
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A novel structure floatation cyclone of natural inlet air has been designed, and its structural characteristics and floatation principle have been analyzed. The velocity and pressure distributions within the flow field of the floatation cyclone have been studied by Navier-Stokes equations. Based on the flow characteristics of the mixture of fine coal and water, reasonable boundary conditions are decided and the equations are modified, so that the final equations can describe the real flow state of the flow field of the floatation cyclone. The boundary surface position between float coal and tailings is determined and there is an air cylinder in the central region of the floatation cyclone. The research reveals the floatation mechanism of the floatation cyclone. The floatation results can be greatly improved by regulating the structural dimensions of cyclone. The experimental results show that the floatation cyclone is very effective for the floatation of fine coal grains. 相似文献
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Synthesis of nanozeolite A from natural clinoptilolite and aluminum sulfate; Optimization of the method 总被引:1,自引:0,他引:1
Mehdi Kamali Sedigheh Vaezifar Hamideh Kolahduzan Mohammad Reza Abdi 《Powder Technology》2009,189(1):52-56
The zeolite NaA was synthesized from natural clinoptilolite as Si source and aluminum sulfate or sodium aluminate as Al source. The use of aluminum sulfate for the synthesis of zeolite A has not been reported in the literature. This study presents as the first time a synthesis approach in which the low cost and available source is used to prepare zeolite NaA. These nano particles of zeolite were prepared at different conditions in autoclave and a mixer was designed specifically for this purpose. The synthesized zeolites were characterized by instrumental analysis methods, such as X-ray diffraction (XRD), X-ray fluorescence (XRF), scanning electron microscope (SEM), transmission electron microscope (TEM) and wet chemical analysis by atomic absorption spectroscopy (AAS). Cation exchange capacity (CEC) and loss on ignition (LOI) have been also measured on the prepared samples. The influences of different parameters such as reaction time, temperature, initial gel concentration, mechanical stirring and drying conditions on the improvement of the final products were experienced and the procedure for the efficient synthesis of zeolite NaA was optimized with available quality control tests. Solubility of clinoptilolite as the Si source in alkaline solutions was also investigated. 相似文献
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硫酸铝生产食品级硫酸铝铵新工艺 总被引:1,自引:0,他引:1
介绍了用一种可拆卸式结晶桶、省去传统工艺中离心及分离工序,生产食品级硫酸铝铵的新工艺。其优点是一次性设备投资少,收率高,产品质量稳定。 相似文献
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微波酸化法从高岭土制取铵明矾的研究 总被引:1,自引:0,他引:1
针对以往采用传统酸熔法和碱熔法从高岭土制备硫酸铝铵(铵明矾)工艺过程存在的诸多缺点,对滇南某高岭土矿样采取微波酸化-中和联合操作路线,制取铵明矾产品。就这一工艺路线及影响产品得率和纯度的因素展开实验研究。结果表明:微波酸化法不仅加快了反应进程,同时改善了反应条件,使反应基本处于常温常压下进行,使氧化铝的提取率大于96%,铵明矾产品纯度大于99%,主要技术指标达到国家标准。 相似文献
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以工业钛液为原料,采用外加晶种常压水解工艺制备了金红石型二氧化钛,研究了水解钛液的组成和操作参数对二氧化钛消色力的影响。实验结果表明:二氧化钛消色力(Tcs)和蓝相光谱值(Scx)随晶种添加量的增加先增大后减小,随判灰延时时间的增加先增大后减小,随钛液F值的增加先稍有增加后明显降低,随钛液二氧化钛质量浓度的增大而增加。在钛液F值(游离硫酸加上与钛结合的硫酸之和与二氧化钛质量浓度的比值)为1.90左右、铁钛比(铁元素与二氧化钛质量浓度的比值)<0.5、二氧化钛质量浓度为190~200 g/L、晶种添加量(晶种中二氧化钛质量与对应批次水解浓钛液中二氧化钛质量的比值)为2.0%~2.2%、灰点为“基点+20 min”、熟化时间为0~30 min、稀释水在二沸后100 min加入的条件下进行水解,经过一次洗涤—漂白—二次洗涤—盐处理—煅烧,所得金红石型二氧化钛的消色力更好。 相似文献
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磷石膏一步法制取硫酸钾工艺研究 总被引:4,自引:0,他引:4
磷石膏是磷酸及其盐的主要副产物,其处理方法多数是堆积放置,从而造成占用大量土地资源,同时还造成了污染。目前,硫酸钾生产主要以曼海姆法为主,即用浓硫酸与氯化钾反应。其主要缺点是设备投资高,腐蚀严重,生产成本高。以副产物磷石膏为主要原料生产硫酸钾,达到了克服上述缺点,避免土地资源浪费和环境污染之目的。磷石膏在助溶剂乙二胺四乙酸存在下,在混合溶剂甲醇和水中与氯化钾反应,生成硫酸钾析出。反应条件为:温度25℃,液固比25,助溶剂浓度为15%,甲醇与水之比为1∶1,反应时间1.5h,磷石膏用量为理论量的110%。产品经检测达到ZBG21006-89一等品指标。 相似文献