Synergistic effects of advanced oxidization reactions in a combination of TiO2 photocatalysis for hydrogen production and wastewater treatment applications

In this paper, the synergistic effects of advanced oxidization reactions in a combination of TiO₂ photocatalysis are comparatively investigated for hydrogen production and wastewater treatment applications. An experimental study is conducted with a photoelectrochemical reactor under a UV-light source. TiO₂ is selected as the photocatalyst due to the high corrosion resistant nature and ability to form hydroxyl radicals with the interaction with photons. The synergetic effects of advanced oxidization processes (AOPs) such as Fenton, Fenton-like, photocatalysis (TiO₂/UV) and UV photolysis (H₂O₂/UV) are investigated individually and in a combination of each other. The Fenton type reagent in the reactor is formed by anodic sacrificial of stainless-steel electrode with the presence of H₂O₂. The influences of various parameters, including pH level, type of the electrode and electrolyte and the UV light, on the performance of the combined system are also investigated experimentally. The highest chemical oxygen demand (COD) removal efficiency is observed as 97.9% for the experimental condition which combines UV/TiO₂, UV/H₂O₂ and photo-electro Fenton type processes. The maximum hydrogen production rate from the photoelectrolysis of wastewater is obtained as 7.0 mg/Wh for the experimental condition which has the highest rate of photo-electro Fenton type processes. The average enhancement with the presence of UV light on hydrogen production rates and COD removal efficiencies are further calculated to be 3% and 20%, respectively.     

Physical properties and microstructures of residual carbon and slag particles present in fine slag from entrained-flow coal gasification

Fine slag (FS) consists of residual carbon (RC) and slag particles (SP). This paper studies the characteristics of SP and RC separately. SP contain a little of pores and mainly consist of spherical particles most of which are solids. RC have a higher pore surface, more continuous and complete pore structure. The chemical structure of inorganic minerals in SP has the following characteristics: According to nuclear magnetic resonance results, the amounts of network structure Q₄ and Q₃ are more than that of chain structure Q₂ and Q₁. The 4-coordinated aluminum consists of 74% and the octahedral coordination (Al(VI)) takes up only 11%. SP is a heterogeneous material which contain not only inorganic minerals but also organic carbon. C atom associated in chemical way with the inorganic matter within SP matrix. The predominant groups of organic carbon within SP matrix are C-C and C-O. C-O groups organically bound with inorganic elements in SP forming C-O-M (M: inorganic elements) bands. The predominant components in RC are C-C and C-O.     

老矿山残矿资源回收方案设计中三维探测及建模技术的应用

目前我国绝大多数中小型老矿山残矿回收面临一系列问题，包括资料缺失无法准确判定老采空区及剩余资源位置，无法准确掌握剩余资源形态及可回收量，回收方案设计与实际资源相差较大等。通过将三维探测及建模技术应用于老矿山残矿资源精准定位及回收方案设计中，有助于解决以上问题。以福建浦城屏峰硫铅锌矿为例，通过对老采空区采用三维激光扫描构建采空区三维模型，结合三维建模计算，构建了目前可回收的剩余资源三维模型。通过模型划分及切割，按照矿体实际形态，在三维模型中布设采切及穿孔工程，并将其导入平面施工图中，不仅可以减少设计工作量，而且能够精准匹配矿体，减少设计偏差。由于周边存在大量老采空区，为保障安全，在采空区及剩余资源精准三维模型的基础上，制定了采空区稳定性监测方案，布设了监测传感器，保障了资源回收安全。     

某铜矿浮选药剂用量优化及技术应用探讨

湖北某铜矿浮选在常规加药条件下，前两槽不能有效形成泡沫层，浮选液面经常出现“翻花”现象，以致选矿指标波动大，起泡剂用量大幅上升，因此开展了浮选试验研究。试验结果表明，在总药量不变的情况下，适当降低粗选捕收剂用量，使有用矿物有序上浮，有效改善了浮选泡沫层的稳定性。在生产现场应用后，浮选现场泡沫稳定，层次感分明，彻底解决了浮选前两槽不起泡、翻花等问题，选铜回收率提高0.69%，起泡剂单耗降低18g/t，取得较好的应用效果。     

有机螯合抑制剂在浮选中的应用

螫合抑制剂通常比一般的抑制剂具有更好的作用效果。介绍有机螫合抑制剂在浮选中的抑制作用，综述浮选中应用有机螯合抑制剂的种类及其应用研究现状。     

残采区掘进工作面注浆加固与支护技术研究

针对海天煤业有限公司郭庄煤矿残采区掘进工作面过垮落空巷的问题,提出了掘进工作面超前预注浆加固方案,并针对不同破坏类型废巷提出相应的支护方式,并进行了工业性试验。结果表明,掘进工作面空巷垮落区域煤岩体间空隙被浆液充填,超前预注浆取得了比较理想的效果。结合基本支护和加强支护的支护方案,实现了掘进工作面的安全顺利推进。     

近年浮选进展

通过浮选相关文献量的分布比较，从数量上描绘了浮选近5年的发展的概貌。重点评述了浮选以下几方面的发展：浮选设备（浮选机、浮选柱和磁力浮选设备）、浮选新药剂（捕收剂、起泡剂和调整剂）、泡沫中分选（粗粒浮选新方法）、载体浮选、无捕收剂浮选、物理作用（外加电场、磁化、超声波等）与浮选、生物浮选（生物捕收剂和调整剂）、浮选泡沫图象、硫化矿和铝土矿浮选等。此外，简述了国内近年浮选工业实践的进展。     

新型硫氨酯ZL4020浮选性能的研究

对新型硫氨酯ＺＬ４０２０浮选分离高旺金矿的伴生金铜矿石进行了研究，工业试验结果表明，与丁基黄药相比，在精矿品位相近的情况下，ＺＬ４０２０浮选的铜、金回收率可提高２％，药剂费用降低约２５％，与Ｚ－２００药剂相比，ＺＬ４０２０的性能略优，但价格便宜，可作为Ｚ－２００药剂的代用品。     

以CF为捕收剂氧化铅锌矿浮选新方法

以CF药剂为捕收剂，研究氧化铅锌矿物和含钙，镁，铁，硅脉石脉石矿物的浮选分离。结果表明，CF药剂可选择性捕收菱锌矿，白铅矿，而对方解石，白云石，石英和褐铁矿作用较弱，六偏磷酸钠和硫酸锌盐化水玻璃选择性抑制方解石，白云石，石英和褐铁矿，Pb(NO3)2是菱锌矿和白铅矿的有效活化剂。CF直接浮选和活化浮选，在自然pH值矿浆条件下都能较好地将菱锌矿，白铅矿与方解石，白云石，石英和褐铁矿分离，活化浮选能有效地降低CF药剂的用量，人工混合矿物的浮选验证了工艺的可行性。