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; the flotation recovery of hematite flocs is remarkably high compared with non flocculated ultrafine hematite. According to the extended DLVO theory, the total interaction potential of Anshan ultrafine...; ultrafine hematite; shear hydrophobic flocculation; extended DLVO theory 1 Introduction The separation efficiencies of ultrafine minerals by flotation are very low due to their small mass, huge......
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were investigated based on the analysis of zeta (ζ) potential and calculations of solution chemistry and DLVO theory. The results show that the valence of cations, instead of the cation type, plays... point) appeared at pH value of 11 may attribute to the adsorption of Mg(OH)2(s). Key words: diaspore; metallic ions; dispersibility; zeta potential; DLVO theory 1 Introduction The influences of metal......
, FT-IR analysis, XPS analysis and DLVO theory. Particles interaction and mechanism of SHMP were also discussed. It was found that aggregation between serpentine and ascharite particles easily happened... bonding and chemical adsorption, resulting in the formation of complex on serpentine surface to decrease its floatability. Key words: serpentine; ascharite; sodium hexametaphosphate; flotation; DLVO......
analysis, adsorption measurements and DLVO theory. The flotation tests indicated that rutile fines could be flocculated by SPA, and pH, shear force (stirring speed) and stirring time played significant... facts, floc flotation of rutile fines could be induced in the form of chemical adsorption by SPA to increase particle size. The data calculated from DLVO theory also indicated that chemical adsorption......
菌浓度下,二氧化硅胶体形成稳定界面乳化物的生成率基本相同,并随体系中细菌浓度的增加,萃取分相过程中乳化液滴聚结速度逐渐加快.细菌表面-OH和-NH键破坏了二氧化硅胶体结构,使溶液中出现了Si-O-H基团.细菌在二氧化硅胶体表面吸附后液滴间由静电排斥能转变为吸引能,使形成乳化液滴聚结能垒降低,从而加快了乳化液滴的聚结速度. 关键词:乳化；细菌；二氧化硅胶体；红外光谱；DLVO理论 中图分类号.... Key words: emulsion; bacteria; colloidal silica; FT-IR spectra; DLVO theory 工业上广泛应用微生物浸出-溶剂萃取-电积法回收低品位硫化矿中的有价成分,取得了很好的经济效益,但在萃取过程中经常产生界面乳化物,比如德兴铜矿自1997年投产以来,溶剂萃取过程中遇到严重的界面乳化问题,整个工艺曾多次不能正常运行[1-2].芬兰保加利亚......
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微细粒锡石疏水团聚-絮凝的研究覃文庆,龙怀中,邱冠周,王淀佐中南工业大学北京有色金属研究总院摘 要:研究了微细粒锡石(Opm)在油酸钠体系的疏水团聚行为,以及大分子絮凝剂聚丙烯酰胺对锡石的絮凝；油酸钠可以强化锡石的絮凝.传统的DLVO理论经过扩展解释了锡石的疏水性团聚和絮凝,同时对高分子絮凝剂的絮凝机理也进行了探讨.关键词:锡石;疏水絮凝;团聚;扩展的DLVO理论;......
不同类型黏土对煤泥水中颗粒分散行为的影响 张明青1,刘炯天2,曾艳1 (1.中国矿业大学,环境与测绘学院,江苏,徐州,221008;2.中国矿业大学,化工学院,江苏,徐州,221008) 摘要:测定了蒙脱石,高岭石和煤颗粒的表面接触角和ζ电位,根据扩展的Derjaguin-Landau-Verwey-Overbeek(DLVO)理论,计算了含两种黏土煤泥水中颗粒间的相互作用势能,并分析了颗...DLVO理论; clay type; coal slurry; dispersion; extended DLVO theory; [全文内容正在添加中] ......
蒙脱石分散体系中用Zeta电位修正静电作用能的计算杨宗义,刘文礼,焦小淼,任志静中国矿业大学(北京)化学与环境工程学院摘 要:针对扩展DLVO理论的静电作用能计算中表面电位难以测定,讨论以Zeta电位代替表面电位进行静电作用能计算的可行性.计算了蒙脱石表面电位,运用扩展的DLVO理论分别用Zeta电位和表面电...距离缩短,颗粒更容易接近从而发生凝聚;(3)随电解质浓度的增加,蒙脱石颗粒Zeta电位和表面电位的绝对值均表现为减小的趋势,且表面电位的变动幅度要远高于Zeta电位的变动;双电层与滑动层厚度均呈指数减小.关键词:Zeta电位;扩展的DLVO理论;表面电位;蒙脱石;......
