利用硫酸铝废渣生产水玻璃和透明白炭黑

论述了以煤系铝矾土提取硫酸铝后的废渣为原料生产水玻璃和透明白炭黑的研究情况     

T型沸石的合成及其在催化方面的研究进展

T型沸石具有高的热稳定性,可用作催化和吸附材料,用于工业催化工业烃类生产、吸附领域。介绍了T型沸石合成过程中原料、组成、晶化温度和时间、模板剂等合成条件对合成产物性能的影响,介绍了表征T型沸石的方法和手段,对T型沸石在工业催化等领域的应用进行了总结,对T型沸石的工业前景进行了展望。     

用硫酸铝废渣生产4A沸石的研究

介绍了利用硫酸铝废渣合成4A沸石的工艺流程,通过此流程生产的4A沸石符合QB1768－93标准,基本上无废渣、废液排放,经济效益明显。作为洗涤剂可取代三聚磷酸钠。     

水玻璃制备L沸石及其影响因素的研究

以廉价水玻璃、白炭黑为复合硅源,偏铝酸钾溶液为铝源,氢氧化钾、氢氧化钠为碱液水热合成高结晶度L沸石。采用X射线衍射(XRD)、扫描电镜(SEM)对合成的L沸石分子筛进行了表征。XRD检测结果表明:制备的L沸石分子筛具有典型的L沸石特征峰,并具有较高结晶度。L沸石的合成区间相对狭窄,我们严格控制反应条件,全面考察了在加入L沸石导向剂的情况下,反应物配比,晶化时间,晶化温度,添加剂对L沸石合成的影响。     

以铝灰为原料生产硫酸铝新工艺

本文介绍了利用铝灰生产硫酸铝的工艺 ,确定了最适宜工艺条件 :反应时间 3h,硫酸浓度 30 % ,硫酸用量 1 .0 5,控制 p H=3,收率达 93.2 %。     

牙膏用4A型沸石的研制

研究了以铝渣和水玻璃为原料合成４Ａ型沸石的方法。考察了原料配经、晶化温度及晶化时间对产品４Ａ型沸石性能的影响。     

以粉煤灰为原料制备的硫酸铝溶液萃取除铁研究

以粉煤灰为原料制备的硫酸铝中含有大量的铁,产品质量达不到标准。实验用P204做萃取剂,用磺化煤油做稀释剂。研究了萃取温度、萃取级数和振荡时间对硫酸铝中含铁量的影响。并进行了反萃实验。在最佳条件下,产品中铁含量可达无铁硫酸铝要求。     

用叶蜡石合成Y型沸石的研究

用福州叶蜡石，在适量补硅的条件下，可合成出Ｙ型沸石产物，用ＸＲＤ进行了表征，其硅铝比为４．１－５．０，每克叶蜡石可制出１．２克产品，对焙烧和合成过程进行分析和讨论，试验结果表明，叶蜡石作为合成Ｙ型沸石的廉价原料，有良好的应用前景。     

以粉煤灰为原料两步法合成亚微米NaA型沸石

以粉煤灰为原料,采用两步法合成了亚微米NaA型沸石(Na12[Al12Si12O48]·27H2O).研究了晶化时间和NaOH溶液浓度对合成亚微米NaA型沸石的纯度、结晶度和粒度的影响.结果表明:晶化时间将影响NaA型沸石的纯度和结晶度;NaOH溶液浓度主要影响产物的粒径大小和粒度分布范围.通过优化合成条件,在5mol/L和6.67mol/L NaOH溶液浓度的条件下,由粉煤灰制备的硅铝凝胶,在100℃分别晶化4h和3h可合成骨架结构完好,结晶度高的亚微米NaA型沸石.合成的亚微米NaA型沸石的平均粒径分别为450nm和250nm,粒径分布范围(size span,SP)分别为3.84和2.44.合成产物的NH4 和Cu2 离子交换容量随着晶粒的减小而显著增加.     

以稻壳为原料合成等级孔Y型分子筛

以稻壳为原料,通过高温碱活化提取稻壳中的硅作为分子筛合成的硅源,利用碳化稻壳中的碳作为介孔模板合成具有等级孔结构的Y型分子筛。采用XRD、N_2吸附-脱附等表征合成的Y型分子筛。考察碱度、晶化时间、晶化温度等合成条件对Y型分子筛结构特性的影响。结果表明,随着碱度的增加,分子筛结晶度先增加后降低。碱度为6.66时,合成的Y型分子筛结晶度最高。当晶化温度为90℃、时间为16 h时,合成的分子筛中含有较少的杂晶。     

Exhausted fluid catalytic cracking catalysts as raw materials for zeolite synthesis

The utilization of exhausted fluid catalytic cracking (FCC) catalysts as raw materials for the zeolite synthesis was analyzed. Samples of the catalysts directly released from FCC units and the corresponding impact grinding pretreated samples were used. Mechanical treatment was observed to decrease catalyst crystallinity and particle size. The catalyst reactivity was analyzed in terms of conversion in zeolite and product properties. Hydrothermal synthesis experiments in NaOH medium were performed. Catalysts conversion in A and X type zeolites was obtained for treated and not treated samples. In particular, high conversion in NaX type were achieved using the more siliceous catalyst, whereas grinding activation produces a decrease of particle size and Al/Si ratio of the zeolites obtained.     

Fluorphlopgopite ceramic via sintering of glass using inexpensive natural raw materials

Fluorphlopgopite ceramic was prepared from kaolin, feldspar and steatite with the addition of pure chemicals Na₂CO₃, AlOOH·H₂O and MgF₂. Glass-ceramics containing the crystal phase fluorphlogopite were prepared using two different routes. The first route was to melt a glass and to crystallize fluorphlogopite by subsequent annealing at temperatures in the range from 900 to 1050 °C kept for 2 h. Here, fluorphlogopite and cordierite were formed. In the other route a sintering procedure was applied using the pre-mentioned materials and sintering temperatures in the range from 900 to 1200 °C kept for 2 h. Here, fluorphlogopite [(Na,K)Mg₃(AlSi₃O₁₀)F₂], spinel and norbergite were precipitated. The unit cell parameters of the formed fluorphlogopite phase are larger than those according to JCPDS data. This is caused by a partial replacement of Mg by Ca or Ba from the raw materials. The microstructure of sintered samples show interlocked fluorphlogopite rods and small spinel crystals. The samples prepared by thermal annealing of the glass showed curved fluorphlogopite and additionally tiny cordierite crystals.     

Redox potential of a glass mass when using off-grade raw materials

The redox conditions for glass making are investigated on a working glass-melting furnace using molding sand. Data obtained from instrumental measurements of the ROP of the glass mass and reasons for destabilization of the technological process are presented. __________ Translated from Steklo i Keramika, No. 6, pp. 6–8, June, 2007.     

玻璃原料配料称重的新探索

介绍了新型称重仪表及传感器所构成的新型配料系统,在玻璃厂原料配料系统中的应用.     

Synthesis of structured filamentous zeolite materials via ZSM-5 coatings of glass fibrous supports

Structured filamentous zeolitic materials were synthesized by ZSM-5 coatings deposited on the glass fibrous supports. A homogeneous coverage of the support filaments was obtained via the synthesis of MFI crystals in fluoride-containing media at neutral pH 7. These materials combine the open macrostructure of woven filamentous fabrics with well-defined microstructure of ZSM-5 crystals. The samples were characterized by BET, XRD and SEM methods. The gas-phase partial oxidation of benzene by N₂O to phenol was investigated as a function of the chemical composition of the support and the ZSM-5 synthesis procedure. The fluorinated zeolitic materials demonstrated the highest activity (above 20% of benzene conversion) with a 97% selectivity towards phenol formation.