A new technology characterized by rapidly non-mechanical settlement of unclassified tailings was developed based on a large number of tests, and dynamic settlement and continual slurry preparation without hardening in...A new technology characterized by rapidly non-mechanical settlement of unclassified tailings was developed based on a large number of tests, and dynamic settlement and continual slurry preparation without hardening in vertical sand silo were eventually realized by the addition of an effective flocculating agent (NPA). The results show that the sedimentation velocity of interface between unclassified tailings and water after the addition of NPA increases by 10-20 times, the sedimentation mass fraction of unclassified tailings at the bottom of vertical sand silo is up to 64%, the solid particle content of waste water meets the national standard, and the side influences of NPA can be removed by the addition of fly ash. The industrial test result shows that the system, the addition manner and the equipments are rational, and the vertical sand silo is used efficiently. This developed system is simple with large throughput, and the processing cost is 2.2 yuan(RMB)/m3, only 10%-20% of that by mechanical settlement.展开更多
目的探讨64排螺旋CT低浓度对比剂在颈部血管成像(CTA)扫描中的应用价值。方法选取2014年1月至2015年11月柳州市人民医院的108例颈部CTA检查患者,随机分成A、B、C组,每组36例。A组给予高浓度对比剂碘普罗胺(370mg I/m L),120 k V;B、C组...目的探讨64排螺旋CT低浓度对比剂在颈部血管成像(CTA)扫描中的应用价值。方法选取2014年1月至2015年11月柳州市人民医院的108例颈部CTA检查患者,随机分成A、B、C组,每组36例。A组给予高浓度对比剂碘普罗胺(370mg I/m L),120 k V;B、C组分别给予低浓度对比剂碘佛醇(320 mg I/m L)、碘海醇(300 mg I/m L),100 k V,3组均给予50 m L对比剂,根据原始图像及重组图像进行综合性分析。结果所有受检者均顺利完成检查。3组病例的主动脉、颈总动脉、基底动脉、舌动脉均清晰显示,动脉造影剂浓度维持在较高水平,A组主动脉CT值(338.40±78.80)HU,颈总动脉CT值(392.85±74.03)HU,基底动脉CT值(311.77±55.11)HU,舌动脉CT值(320.05±54.32)HU;B组主动脉CT值(297.15±67.59)HU,颈总动脉CT值(363.40±71.93)HU,基底动脉CT值(280.25±43.46)HU,舌动脉CT值(292.12±46.33)HU;C组主动脉CT值(280.19±66.77)HU,颈总动脉CT值(351.64±75.38)HU,基底动脉CT值(277.41±45.22)HU,舌动脉CT值(287.35±49.35)HU。A组CT值稍高于B、C组,但差异无统计学意义(P>0.05);重组图像质量评分,A组为(4.53±0.38)分,B组(4.41±0.34)分,C组(4.42±0.29)分,3组评分比较差异无统计学意义(P>0.05)。结论 64排螺旋CT颈部CTA使用低浓度对比剂可获得较好的图像质量,可满足临床需要。展开更多
基金Project(2006BAB02A03) supported by National Key Technology Research and Development ProgramProject(2006BA02B05) supported by Key Programs for Science and Technology Development of China during the 11th Five Year
文摘A new technology characterized by rapidly non-mechanical settlement of unclassified tailings was developed based on a large number of tests, and dynamic settlement and continual slurry preparation without hardening in vertical sand silo were eventually realized by the addition of an effective flocculating agent (NPA). The results show that the sedimentation velocity of interface between unclassified tailings and water after the addition of NPA increases by 10-20 times, the sedimentation mass fraction of unclassified tailings at the bottom of vertical sand silo is up to 64%, the solid particle content of waste water meets the national standard, and the side influences of NPA can be removed by the addition of fly ash. The industrial test result shows that the system, the addition manner and the equipments are rational, and the vertical sand silo is used efficiently. This developed system is simple with large throughput, and the processing cost is 2.2 yuan(RMB)/m3, only 10%-20% of that by mechanical settlement.
