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沥青拌和站三种燃料应用的比较研究 被引量:5
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作者 何满 李自光 《公路与汽运》 2013年第1期149-151,共3页
通过对气体、液体和固体燃料燃烧过程、燃料消耗量和烟气排放量的对比分析,得到气体燃料具有燃烧过程最简单、火焰传播速度和燃烧速度最快、节能减排性最好等优点,突出显示了其在沥青拌和站中应用的优越性;研究了不同燃料的空气过剩系... 通过对气体、液体和固体燃料燃烧过程、燃料消耗量和烟气排放量的对比分析,得到气体燃料具有燃烧过程最简单、火焰传播速度和燃烧速度最快、节能减排性最好等优点,突出显示了其在沥青拌和站中应用的优越性;研究了不同燃料的空气过剩系数对拌和站成品料产量的影响,研究结果表明在3种燃料中,气体燃料在提高成品料产量方面的效果是最佳的。 展开更多
关键词 公路 煤粉 液体燃 气体燃 空气过剩系数 成品料产量
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Evaluation of graphite depressants in a poly-metallic sulfide flotation circuit 被引量:5
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作者 Nikhil Gupta 《International Journal of Mining Science and Technology》 SCIE EI CSCD 2017年第2期285-292,共8页
Synthetic dyes are commonly used for graphite depression in poly-metallic flotation circuits; however,these dyes can be very expensive. The aim of this study is to evaluate performance of certain low-cost alternative ... Synthetic dyes are commonly used for graphite depression in poly-metallic flotation circuits; however,these dyes can be very expensive. The aim of this study is to evaluate performance of certain low-cost alternative depressants for a complex lead-zinc(Pb-Zn) ore rich in graphite(Gr-C) on a conventional mini pilot-scale flotation circuit. The reagents used were commercial and industrial grade starch; agro-based waste-sugarcane bagasse and charred(burnt) bagasse powder. The primary evaluation criteria were quality(grades) of lead and zinc concentrates, their recoveries(%), and graphite rejection(%) in the tails.Benchmark tests using nigrosine as graphite depressant showed 94.3% rejection of Gr-C. The results with commercial starch were found as effective with 93.8% graphite rejection. Furthermore, bagasse powder showed potential in improving product quality(36.4% and 65.6% Pb grade and recovery) with an intermediate effectiveness in graphite rejection(85.6%). The order of effectiveness in Gr-C rejection follows nigrosine % commercial starch > bagasse > industrial starch > charred bagasse. In addition, the effect these depressants on silver(byproduct) grade and recovery was also investigated. 展开更多
关键词 Graphite depressants Sulfide flotation Dyes Starch Bagasse Hydrophobic impurities
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Synthesis of 2,6-pyridine Dimethyl Formate under Microwave Irradiation 被引量:1
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作者 Guofu Zhang Qing Zhang +3 位作者 Hairui Zhang Heling Ye Lingling Liu Li Zhang 《Journal of Chemistry and Chemical Engineering》 2011年第3期255-258,共4页
An efficient synthesis of 2,6-pyridine dimethyl formate happened under the microwave irradiation is proposed. It is noteworthy that some factors influence the product yield such as time, temperature, ratio of reactant... An efficient synthesis of 2,6-pyridine dimethyl formate happened under the microwave irradiation is proposed. It is noteworthy that some factors influence the product yield such as time, temperature, ratio of reactants, and acidity which were discussed. The optimized quantity of 2,6-pyridine dimethyl acid is 10 mmol and methanol is 25 mmol. The yield is up to 95%-96% when using 2 mL 30% sulfuric acid. All products have been characterized by IR and 1H NMR. 展开更多
关键词 MICROWAVE 2 6-pyridine dimethyl acid 2 6-pyridine dimethyl formate synthesis.
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