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1.
In this study, various ZSM-5/MCM-41 micro/mesoporous zeolite composites have been prepared by alkalidesilication and surfactant-directed recrystallization of ZSM-5. The effects of particle size and Si/Al ratio of initial ZSM-5 zeolites on the structure and catalytic performance of ZSM-5/MCM-41 composites are studied. The results of XRD, TEM N2-adsorption-desorption, NH3-TPD and in situ FT-IR revealed that ordered hexagonal MCM-41 mesopores with 3-4 nm pore size were formed around ZSM-5 crystals, and the specific surface area and mesopore volume of composites increased with increasing the Si/Al ratio of initial ZSM-5. Catalytic cracking of n-dodecane (550 ℃, 4 MPa) showed that the ZSM-5/MCM-41 composites obtained from the high Si/Al ratio and nano-sized initial ZSM-5 zeolites exhibited superior catalytic performance, with the improvement higher than 87% in the catalytic activities and 21% in the deactivation rate compared with untreated zeolites. This could be ascribed to their suitable pore structure, which enhanced the diffusion of reactant molecules in pores of catalysts.  相似文献   
2.
High-alumina coal fly ash (HAFA) is a special solid waste due to the existence of more than 45% alumina and 35% silica, which can be applied to prepare Al-Si series ceramics if the impurities can be removed and the Al/Si mass ratio can exceed 2.55 (Mullite: 3Al2O3.2SiO2). In this work, a new mechanical–chemical synergistic activation–desilication process is proposed, and the contents of different impurities can be lowered up to less than 1%, and the Al/Si mass ratio can be elevated from 1.26 to 2.71. Especially, the mechanism of this process is investigated in detail. The analysis of the mechanism shows that the decrease of Q4(3Al) and the increase of Q4(0Al), Q4(1Al), and Q4(2Al) improve amorphous silicate reactivity through synergistic activation, and the exposed amorphous Si-O-/Si-O-Si can be removed by OH- during the desilication process (desilicated ratio>55%), which help the fine mullite to exhibit excellent properties (bulk density > 2.85 g/cm3, apparent porosity < 0.5%) during the sintering process. Finally, this process not only decreases the pollution but also alleviates the shortage of Al/Si resources and promotes the clean development of coal-fired power generation.  相似文献   
3.
常庆伟 《金属矿山》2016,45(12):109-112
铁矿阴离子捕收剂大多采用脂肪酸类捕收剂,工业上需要进行加温浮选才能确保浮选的效果。通过化学改性及复配合成了一种耐低温型铁矿捕收剂CY-20,并与高效速溶型抑制剂CYZ-20应用于山东某铁矿的低温反浮选试验。试验结果表明:CY系列药剂在浮选温度15℃下获得了精矿品位65.86%,回收率95.18%的浮选指标,与30℃时浮选指标基本相当。CY-20具有较强的耐低温性和选择性,可实现整个铁矿阴离子反浮选作业的常温操作,对矿山企业的节能减排、清洁环保生产具有重要的意义。  相似文献   
4.
针对亚熔盐氧化铝流程中二氧化硅脱除的问题,提出采用钙铁榴石、水合碳铁酸钙和水合硫铁酸钙进行高浓环境介质分离;采用氧化物组成计算方法对此类化合物的Gibbs自由能进行了计算,在此基础上对脱硅剂合成反应进行了热力学研究;确定了不同脱硅剂的脱硅产物及其Gibbs自由能,对三种脱硅剂的脱硅能力进行对比,选择了最优脱硅剂。  相似文献   
5.
铝土矿反浮选脱硅研究综述   总被引:19,自引:3,他引:16  
阐述了铝土矿反浮选脱硅的基本原理;指出铝土矿反浮选的技术关键在于铝硅酸盐矿物的强化捕收、一水硬铝石的选择性抑制以及矿泥的选择性分散、矿物的选择性磨矿等方面;介绍了国内外铝土矿反浮选在主要矿物的晶体结构和表面化学、新型药剂及药剂作用机理、反浮选体系分散与絮凝、选择性磨矿等方面的研究现状。  相似文献   
6.
A conceptual study has been carried out to convert geothermal water and condensate into a valuable industrial, agricultural or drinking water resource. Laboratory and field pilot test studies were used for the conceptual designs and preliminary cost estimates, referred to treatment facilities handling 750 kg/s of geothermal water and 350 kg/s of steam condensate. The experiments demonstrated that industrial, agricultural and drinking water standards could probably be met by adopting certain operating conditions. Six different treatments were examined. Unit processes for geothermal water/condensate treatment include desilication of the waters to produce marketable minerals, removal of dissolved solids by reverse osmosis or evaporation, removal of arsenic by oxidation/precipitation, and removal of boron by various methods including ion exchange. The total project cost estimates, with an accuracy of approximately ±25%, ranged from US$ 10 to 78 million in capital cost, with an operation and maintenance (or product) cost ranging from US$ 0.15 to 2.73 m−3 of treated water.  相似文献   
7.
为有效解决中低品位高硅铝土矿脱硅及矿石溶出性能。采用焙烧碱浸脱硅技术方案,考察焙烧温度、焙烧时间、焙烧矿石粒度对脱硅效果的影响。研究结果表明:最佳焙烧脱硅条件为温度950℃、时间60S、矿石粒度150μm。焙烧过程中含硅物相转变为无定型二氧化硅,碱浸过程中氧化铝、二氧化硅同存时优先生成NaAl2(AlSi3O10)(OH)2。在最佳脱硅条件下矿石脱硅率为47.12%,相比原矿、焙烧矿精矿溶出率提高并达到97.68%。  相似文献   
8.
针对磷石膏综合利用的加工特性要求,研究了磷石膏浮选脱硅工艺技术。研究表明,在捕收剂H2-Z用量为260g/t,矿浆p H=2.0,浮选温度20℃的条件下,采用一粗二精,中矿逐级返回浮选试验流程处理该磷石膏,通过72h连续性试验,获得的精矿二水硫酸钙含量平均为95.65%,Si O2含量平均为2.69%,二水硫酸钙回收率为89.30%,试验取得了较好的脱硅指标。  相似文献   
9.
铝土矿选矿脱硅研究现状与展望   总被引:8,自引:2,他引:6  
本文描述了我国铝土矿资源的特征 ,详细地介绍了铝土矿选矿脱硅研究现状和最新进展 ,分析了发展趋势  相似文献   
10.
王祖旭  李楠 《金属矿山》2015,44(9):76-79
昆明冶金研究院研发了一种新型、高效的铝土矿正浮选捕收剂G7,为检验其在提高精矿指标、耐低温、易消泡脱水方面的优越性能,以云南某一水硬铝石型铝土矿为研究对象进行了选矿试验。结果表明,Al2O3和Si O2含量分别为67.51%和12.64%、铝硅比为5.34的铝土矿石在磨矿细度为-0.074 mm占90%、矿浆温度为3℃和20℃的情况下,采用2粗2精1扫、中矿顺序返回流程处理,分别可获得Al2O3品位和回收率为75.51%和89.13%,铝硅比为15.63的优质精矿和Al2O3品位和回收率为76.25%和90.28%、铝硅比为16.68的优质精矿。精矿指标分析和浮选过程观察表明,G7是一种性能优良、稳定、高效且适应性强的铝土矿浮选捕收剂。  相似文献   
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