金银火法冶炼中炉衬废砖选矿回收金银

金银火法冶炼中炉衬废砖的金银含量高，回收价值大。研究确定了浮－重联合选矿、产品酸浸除镁的炉衬废砖处理工艺。采用组合浮选药剂，可强化浮选效果，浮选尾矿经摇床重选确保了粗粒金银的回收；精矿酸浸除镁可满足冶炼要求；尾矿脱镁后可返回铅粗炼系统综合回收金、银、铜、铋等有价金属，有效地利用了资源。工艺流程简单、合理，易于实施，应用于生产取得了良好的经济效益     

生物药剂在矿物加工和冶金中的应用

综述了生物药剂在矿的加工和冶金中的研究现状及应用，指出了生物药剂的发展趋势及研究方向。     

攀枝花细粒钛铁矿混合药剂浮选研究

通过对攀枝花细粒钛铁矿物质组成的研究，提出了利用混合药剂浮选细粒钛铁矿的技术措施。结果表明，苯乙烯膦酸与２号油按４：１比例混合使用，浮选效果最好，经三次精选，可获得了ＴｉＯ２品位４７．２２％，回收率７４．５８％的钛精矿。     

新型高效合成起泡剂替代2^#油的研究与实践

为了解决国内起泡剂品种单一、质量不稳定、货源紧张、价格上涨等诸多问题，研制了新型合成起泡剂ＢＫ－２０１。通过小型试验、工业生产实践证明，该药剂适应永平铜矿的矿石性质，具有起泡能力强、浮选速度快、适应性强、用量小、价格低等特点，它能完全取代现场生产所用的以松节油为原料的２＃油，在选别指标相当时，能降低起泡剂用量量４２％以上，矿山每年因降低药费可增加经济效益５３万元以上。     

陕甘宁盆地气井固井水泥和外加剂应用现状

介绍长庆油田在陕甘宁盆地气探井完井固井中面临的问题和解决办法以及水泥和外加剂的应用。提出了进一步提高气井固井质量的几点建议。     

Mechanisms for naphthalene removal during electrolytic aeration

Batch tests were performed to investigate chemical and physical processes that may result during electrolytic aeration of a contaminated aquifer using naphthalene as a model contaminant. Naphthalene degradation of 58-66% took place electrolytically and occurred at the same rates at a pH of 4 and 7. 1,4-naphthoquinone was identified as a product of the electrolysis. Stripping due to gases produced at the electrodes did not result in any naphthalene loss. Hydrogen peroxide (which may be produced at the cathode) did not have any effect on naphthalene, but the addition of ferrous iron (which may be present in aquifers) resulted in 67-99% disappearance of naphthalene. Chlorine (which may be produced from the anodic oxidation of chloride) can effectively degrade naphthalene at pH of 4, but not at a pH of 7. Mono-, di- and poly chloronaphthalenes were identified as oxidation products. Ferric iron coagulation (due to the oxidation of ferrous iron) did not significantly contribute to naphthalene loss. Overall, electrolytic oxidation and chemical oxidation due to the electrolytic by-products formed are significant abiotic processes that could occur and should be accounted for if bioremediation of PAH-contaminated sites via electrolytic aeration is considered. Possible undesirable products such as chlorinated compounds may be formed when significant amounts of chlorides are present.     

无水试剂的制备及参与植物油转酯化效果的快速评估

本文旨在提供实验室内快速制备无水试剂的方法。方法:先在实验室内用钠法制备无水试剂(石油醚、四氢呋喃和甲醇钠),然后以植物油为反应底物,检验了所制备的无水试剂的转酯化效率,并用薄层层析技术和气相色谱技术对转酯化效率进行验证。结果表明,本次制备的无水试剂可稳定、高效、快速的对植物油脂进行转酯化反应,且运用薄层层析技术能快速评估转酯化效率。     

胶磷矿浮选药剂添加点的优化改造

分析了安宁矿业分公司胶磷矿单反浮选的一次粗选中将浮选药剂加入二级搅拌槽存在的问题,经将加药点前移至一级搅拌槽后,浮选效果改善,精矿指标稳定,系统结垢周期延长,同时减少了浮选药剂的添加量。     

Iron‐Catalyzed Cross‐Coupling of 1‐Alkynylcyclopropyl Tosylates and Related Substrates

1‐Alkynylcyclopropyl tosylates react with alkylmagnesium halides in the presence of catalytic ferric acetylacetonate [Fe(acac)₃] under net propargylic substitution; allene formation, which is the prevalent reactivity mode of propargylic substrates otherwise, was noticed as a side reaction only when branched alkyl‐ or aryl‐Grignard reagents were used. These transformations represent the first successful iron‐catalyzed cross‐coupling reactions of tert‐alkyl electrophiles.

     

Monolithic Ag-Mt dispersed Z-scheme pCN-TiO2 heterojunction for dynamic photocatalytic H2 evolution using liquid and gas phase photoreactors

Fabricating montmorillonite (Mt) dispersed Ag/pCN-TiO₂ heterojunction for stimulating photocatalytic H₂ evolution using two/three phases photo-reactor systems has been investigated. Using Ag–Mt/pCN–TiO₂ composite in three-phase, H₂ rate of 667 μmolh⁻¹ was obtained, much greater than TiO₂-based samples due to superior charges separation with Ag SPR and Mt mediated effect. Among parameters, 0.15 g catalyst loading at pH 7 gives highest H₂ yield with glycerol sacrificial reagents. More interestingly, liquid system with glycerol gave best H₂ rate while gas-phase with methanol encouraged H₂ productivity. Furthermore, H₂ rate increased to 8230 μmolh⁻¹ using two-phase monolith reactor, 9.01 and 12.34 times greater than two-phase fixed-bed and three-phase slurry systems. Comparatively, highest AQY and SY of 39.85% and 54.86 μmolh⁻¹cm⁻³ were obtained using monolith. This superior efficiency was due to efficient photon-flux consumption, effective mass-transfer and large light-fluxed. These findings would be fruitful for further development for clean hydrogen production through photocatalytic water splitting.