石棉尾矿酸浸渣对铜离子的吸附性能

对石棉尾矿酸浸渣进行了焙烧处理,考察了焙烧后的石棉尾矿酸浸渣对溶液中Cu2+的吸附性能,测定了其表面x电位,对吸附Cu2+前后的石棉尾矿酸浸渣进行了表征,探讨了吸附机理. 结果表明,石棉尾矿酸浸渣的等电点为2.03;石棉尾矿酸浸渣用量3 g/L、吸附时间60 min、吸附温度25℃、溶液pH值4.85时,该渣对Cu2+的吸附效果最佳. 石棉尾矿酸浸渣对Cu2+的等温吸附符合Langmuir方程,为化学吸附,其吸附等温式为Ce/q=0.0749Ce+0.1076,主要为表面配位吸附和离子交换吸附.     

石棉尾矿酸浸渣对铬离子的吸附性能

采用煅烧方法对石棉尾矿酸浸渣进行预处理,通过比表面积测定仪对煅烧前后的酸浸渣进行了表征,研究了煅烧后的石棉尾矿酸浸渣对溶液中Cr3+的吸附性能,并对吸附机理进行了探讨. 实验结果表明,酸浸渣的比表面积随煅烧温度的提高而增加,600℃时达最大值379.33 m2/g,此后随煅烧温度升高而下降;一定范围内,增加酸浸渣用量、延长吸附作用时间、升高吸附温度、提高pH值均可改善对Cr3+的吸附去除效果,其中pH的影响最大. 酸浸渣对Cr3+的等温吸附符合Langmuir方程. 由于酸浸渣表面z电位为负,酸浸渣对Cr6+的吸附远低于对Cr3+的吸附. 基于EDX能谱及FT-IR光谱分析结果,确定酸浸渣对Cr3+的吸附主要为离子交换吸附和表面配位作用.     

亚甲基蓝在石棉尾矿酸浸渣上的吸附行为

采用XRD、FT-IR等手段分别对石棉尾矿和石棉尾矿酸浸渣进行表征。利用活化煅烧的石棉尾矿酸浸渣对亚甲基蓝(MB)进行静态吸附研究, 探讨了吸附剂投加量、吸附时间、pH值、离子强度和温度等因素对吸附作用的影响。结果表明:pH值、离子强度和温度对亚甲基蓝在石棉尾矿酸浸渣上的吸附影响较大。当pH<4.5时, 吸附量随着pH值的增大而增大, 随后pH值增大, 吸附量基本不变;亚甲基蓝在石棉尾矿酸浸渣上的吸附随离子强度的增大而降低;通过相关热力学研究计算吸附过程为吸热过程, 即高温利于吸附;亚甲基蓝在石棉尾矿酸浸渣上的吸附动力学符合Lagrange准二级方程;热力学符合Langmuir等温线方程。     

一种利用石棉尾矿制备片状纳米氢氧化镁和球形纳米白炭黑的方法

本发明介绍了一种石棉尾矿综合利用的方法。将石棉尾矿粉与盐酸溶液进行浸出反应并分离固液组分;在所得滤液中加入氧化剂氧化Fe^2＋后加碱溶液沉淀滤液中的铁、铝、钙组分;过滤除去沉淀物后,加碱反应,同时加入适量的粒子阻隔剂,得到原级粒度为纳米级、颗粒形状为片状的氢氧化镁;将石棉尾矿粉与盐酸反应后的残渣与氢氧化钠或者碳酸钠在加热的情况下进行反应,反应后将产物过滤,     

石棉尾矿酸浸渣对重金属离子及放射性核素的吸附

石棉尾矿是石棉矿选矿加工过程中剥离下来的尾渣,基于其无害化处理和"以废治污"的思想理念,研究石棉尾矿酸浸渣的吸附性能。通过综述石棉尾矿酸浸渣对废水中的重金属及放射性核素富集、去除等方面的研究,系统讨论吸附行为,表明石棉尾矿酸浸渣对重金属及放射性核素具有强吸附能力而在废水处理领域有着良好的应用前景。     

石棉尾矿综合利用研究现状及市场发展趋势

以石棉尾矿为原料采用酸浸、氧化除铁、控制碱析Mg(OH)2以及酸浸渣碱溶、烯酸法控制沉析SiO2工艺,并在碱析沉析过程中适时添加表面处理剂和粒径控制剂,制备了Mg(OH)2 和高比表面积SiO2.从行业发展的角度分析综合利用石棉尾矿资源,特别是青海省石棉尾矿资源具有储藏量大、品位高的特点,将石棉尾矿资源优势转化为经济优...     

石棉尾矿酸浸渣对铜离子的吸附研究

研究了经过煅烧的石棉尾矿酸浸渣对水中Cu2+的吸附性能,并用红外光谱和能谱对吸附机理进行初步分析.结果表明:在Cu2+浓度为20mg/L,溶液体积为100 mL,初始pH=4.85,吸附温度为25℃,吸附时间为60 min,石棉尾矿酸浸渣用量为10.0 g/L时,Cu2+去除率为96.5%,溶液中残余Cu2+的浓度为0.7 mg/L,达到了GB8978-1996污水综合排放标准;弱酸性条件(4.85相似文献   

HF预处理对石英质玉尾矿微晶玻璃晶相及微观结构的影响

使用HF对石英质玉尾矿进行预处理后,协同无铅CRT玻璃制备了微晶玻璃.采用DSC、XRF、XRD、FE-SEM及EDX等测试技术分析了微晶玻璃样品热处理过程中的热反应、晶相和显微结构.结果表明:使用HF对石英质玉尾矿进行预处理,能提高石英质玉尾矿的烧结活性.随着HF溶液浓度的上升,预处理后石英质玉尾矿的烧结活性先升高后降低.其中8%HF溶液处理4 h的样品烧结后,主晶相为透长石和钠长石,晶粒呈板状;次晶相为石英和透辉石,晶粒分别呈颗粒状和枝状.     

磷矿浮选尾矿矿石特性研究

以贵州瓮福磷矿浮选后的尾矿资源为研究对象,研究了其反应活性、抗阻缓性及酸解反应工艺特性.得出,尾矿主要物相是白云石,其反应活性为99.65%,抗阻缓系数为12.87,最佳酸解反应工艺条件为:反应时间90 min,液固比3,浸出温度80℃,酸过量系数1.05,MgO的浸出率高于P2O5的浸出率(均高于95%).研究表明:瓮福磷矿浮选尾矿反应活性好,有一定的抗阻缓性,MgO和P2O5在酸解过程中近乎是同时浸出,只是前者略高于后者.本研究可为综合利用浮选尾矿中的镁、磷提供必要的基础理论依据,对低品位磷矿的利用有一定借鉴作用.     

钨尾矿预处理制备矿物聚合材料

按照"摇床重选→机械球磨→碱熔融"的步骤对钨尾矿进行逐级预处理,将各级预处理所得的钨尾矿分别与铝校正料偏高岭土复合后在碱激发剂作用下制备矿物聚合材料.通过正交实验对原料配方进行优化,研究各因素对抗压强度指标的影响规律,探索制备矿物聚合材料的优化原料配方及主要影响因素,并借助XRD和ESEM-EDS对优选矿物聚合材料试样的微观结构进行表征.结果表明:随着对钨尾矿的逐级预处理,其反应活性逐级增加,经三级预处理之后所得钨尾矿制备的矿物聚合材料试样7d龄期最高抗压强度可达到48.45 MPa;对于以各级预处理所得钨尾矿制备的矿物聚合材料,正交设计中的因素对它们抗压强度指标的影响规律多数不一样,对抗压强度影响程度最大的因素也各不相同;ESEM分析表明优选试样内部形成了对其强度起支撑作用的致密结构,EDS分析表明所选区域凝胶相的Si/Al比例与实验设计的Si/Al比例不一致.     

Polyvinylpyridine-divinylbenzene and asbestos composites

The in situ copolymerization of vinylpyridine and divinylbenzene in crysotile asbestos cardboards yields composites of higher mechanical strength and chemical stability than plain carboard. The composites have been tested as gasket rings and separators of advanced alkaline water electrolysers. The chemical and morphological changes to which the materials are subjected under these conditions have been followed up by i.r. spectroscopy and SEM and correlated with chemico-physical properties.     

国产石棉绒的应用分析

介绍三门峡天成电化有限公司隔膜电解槽用石棉绒经历的国产石棉绒一进口石棉绒一国产石棉绒的过程。实际运行表明，每台电解槽的国产石棉绒用量为20kg，比进口石棉绒少8kg；总管氯中氢体积分数也由1．5％左右降至0．5％。     

Submarine mine tailings management

The placement of mine tailings at depth in the marine environment is reviewed. This review considers first the engineering aspects of a pipeline system which transports tailings slurry from a process plant to the coast and then to a location at a depth of typically 200 m on the continental slope. Next, the fluid dynamic behaviour of the tailings, once discharged from the end of the pipe, are discussed, and a numerical model is presented which simulates the fate of both the dissolved and solids component of the tailings slurry in the marine environment. This latter model can be used to estimate the environmental impact of a proposed deep sea tailings placement system.     

Dielectric characterization of UICC asbestos samples

The frequency dispersion of the dielectric coefficient and of the dielectric loss measured on suspensions of asbestos fibers in paraffin oil as functions of fiber concentration and temperature showed for Canadian chrysotile relatively large energy dissipation maxima which can be explained in terms of relaxation of transverse and longitudinal polarization with slightly different energies of activation. Amosite fibers, in contrast, were found to be dielectrically inactive compared with the large-scale effects exhibited by chrysotile. Chrysotile suspensions were slightly thixotropic at volume concentations of the fibers as low as 0.5%, while the amosite suspensions did not show thixotropic behavior up to fiber concentrations of 1.0 vol.%.     

Polymer encapsulation of colloidal asbestos fibrils

The free-radical polymerization of several monomers in an aqueous suspension containing chemically opened chrysotile asbestos fibrils was investigated with the intention of promoting complete encapsulation of the individual colloidal fibrils. The degree of polymer deposition on the colloidal substrate is dependent upon several factors including monomer and polymer solubility, initiator type, ionic comonomers, and degree of interfacial wetting. Successful encapsulation was achieved by the addition of novel unsaturated polyelectrolytes which served a dual role as dispersing agent and comonomer. Such methods are useful for the preparation of reinforced composites with controlled interfacial properties. In one example, it is shown that asbestos fibrils surrounded by a rubbery layer can impart greater toughness to a reinforced composite, compared to a composite in which the rubbery phase is dispersed at random or isolated from the interface. The technique can be extended to other types of fillers. The various methods of chemically “opening” asbestos are summarized.