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Flotation column is widely used as the separation equipment for fine mineral due to its high selectivity. However, this device may be unsuitable for the coarse particle flotation and has high handling ability. A two-stage flotation column with dimensions of 2 000 mm× 1 000 mm×4 000 mm was designed to enhance the column flotation process. The energy input was modified by adjusting the flow rate and the head of circulating pump. The flotation column was designed with low energy input in the first stage (speed flotation stage) to recover easy-to-float materials quickly, and high energy input in the second stage (recovery stage) to recover difficult-to-float minerals compulsorily. Contrast experiments on the throughput and coarse coal recovery of high ash coal from the Kailuan Mine were conducted using conventional single-stage flotation column and the two-stage flotation column. The results show that the combustible matter recovery of the two-stage flotation column is 5.25% higher than that of the conventional single-stage flotation column. However, the ash contents of clean coal for both columns are similar. Less coarse coals with low ash are obtained using the two-stage flotation column than that using the single-stage column flotation with the same handling ability. The two-stage flotation column process can enhance coal flotation compared with the conventional single-stage column flotation. 相似文献
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基于单片机的温室自动控制系统设计 总被引:14,自引:0,他引:14
温度、湿度和CO2浓度等是影响作物生长的重要环境因子,为有效进行作物生长的环境控制,针对日光温室的特点,以模糊控制理论为基础,计算机控制技术为平台,设计了一个基于模糊控制技术的计算机温室控制系统;介绍了以PC机为上位计算机,MCS一51单片机为核心的智能仪表为下位机的智能温室分布式测控系统的工作原理及主要功能;详细阐述了该系统的软、硬件实现方法;该套控制系统符合我国现阶段的国情且能很好地满足生产要求,成本低,运行可靠,便于推广应用. 相似文献
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通过难沉降煤泥水絮凝试验及相关分析,其结果表明,絮体分形维数与上清液浊度和浑液面平均沉速均显著相关,因此可作为反映絮凝沉降效果的指标。试验研究了K+、Na+、Ca2+三种离子对絮体分形维数和絮凝效果的影响,结果表明:3种离子对分形维数的影响趋势均为随离子浓度增加,分形维数先增加后降低,3种离子对应絮体的最大分形维数分别为2.01、1.94和2.41。在此基础上,利用氯化钙作凝聚剂,考察了单独使用长链絮凝剂、凝聚剂配合长链絮凝剂、凝聚剂与短链絮凝剂配合长链絮凝剂3种药剂制度对煤泥水絮体分形维数和絮凝效果的影响,结果表明:3种药剂制度的最大分形维数分别为2.18、2.41和2.63,3种药剂配合使用的絮凝效果最优。 相似文献
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