煤炭三维可选性曲面绘制的研究

为了更全面地反映煤炭可选性的密度、粒度分布情况,文章在传统二轴可选性曲线的基础上,把粒度级及粒度组成作为第三个轴,利用MATLAB软件,采用二维插值(grad data)中的三次插值(cubic)方法,绘制了三维的浮物曲面、密度曲面和分选密度邻近物曲面。通过二维插值实现了按灰分查询和按产率查询任意粒度级的理论分选指标,对煤炭的可选性评定有一定借鉴作用。     

Efficient Recovery of Combustibles From Coking Coal Fines

The processing of three Indian coking coal fines with feed ash values of 25.12% (S1), 22.97% (S2), and 30.38% (S3) was studied. Substantial improvement in the overall recovery of combustible could be obtained by splitting sample S1, exhibiting good washability but poor release behavior, into a coarser and a finer fraction and treating them by gravity and Jameson cell flotation, respectively. Sample S2 had over 70% of the material below 100 µm and had excellent release characteristics. The Jameson cell flotation indeed resulted in very high recovery of combustibles at the desired target ash values and split processing was not required for this sample. The floatability and washability characteristics of sample S3 indicated that gravity-based methods might improve combustible recovery in terms of theoretical yield at the desired product ash values. A combination of spiral concentration of the coarser fraction and froth flotation of the finer fraction using a Jameson cell showed some improvement in the combustible recovery of this sample. It was established in this study that if the floatability is poor or moderate, then split processing improves coal cleaning performance. Flotation alone may be recommended only when samples exhibit excellent floatability.     

Split Processing of High Ash Indian Coking Coal Fines Using Jameson Flotation Cell

The processing of two samples of high ash Indian coking coal fines (?500 μm) has been studied. Mechanical cell flotation of two coal samples resulted in poor recovery of combustibles at a specified ash content of 17%. The use of Jameson Cell for flotation was also found helpless in improving the performance. The poor recovery of combustibles was attributed to low recovery of coarse particles (>300 μm). Split processing involving spiral concentration of the coarser fraction (?500 + 100 μm) and Jameson Cell flotation of the ?100-μm fraction resulted in an improved overall performance. Substantial improvement in the yield of clean coal at the same target ash (17%) could be achieved in split processing.     

超细纤维拒水拒油织物的研制和整理研究

以涤纶超细海岛型纤维和毛涤纱线为原料,采用绉组织和织物中加入高收缩涤纶丝的方法形成具有一定高度的仿乳突效果,研制出仿荷叶织物。对该织物进行拒水拒油及耐洗性整理,探讨整理剂和配套耐洗加强剂浓度、焙烘温度和时间对整理效果的影响,在此基础上得到优化工艺参数。     

改性纳米二氧化钛的性能研究

研究了改性纳米二氧化钛在乙二醇介质中的稳定性及其影响因素和应用性能.结果表明，改性纳米二氧化钛溶胶的稳定性与改性剂的用量和体系pH值有关，在大于等电点时，随体系pH值的增加，溶胶的稳定性提高.红外光谱和应用性能研究表明，由于在改性纳米二氧化钛微粒表面引入了大量的硅羟基和环氧基等基团，织物经其整理后，抗紫外线等性能的耐久性有很大提高，且随着纳米改性剂用量的增加，耐久性逐渐提高.     

活性染料耐氯化水色牢度分析及改进方法研究

优化了耐氯固色剂TF-241的应用工艺,探讨了对活性染料的耐氯固色效果。结果表明,不同结构的活性染料耐氯化水的性能不同,耐氯固色剂TF-241可使织物耐氯化水色牢度提高至4级以上,并对摩擦、耐洗牢度有一定的改善效果,对日晒色牢度及染色色光影响不大。同时其具有一定的耐洗性,固色效果受柔软整理影响小。TF-241最佳固色工艺为:固色温度40~50℃,固色时间20 min,焙烘温度160℃。对于一般颜色,推荐用量为3%,对于耐氯较差的颜色如艳蓝、翠蓝、黑色、丈青等,推荐用量为4%~5%。     

GB/T16417-2011《煤炭可选性评定方法》编制说明

国家标准GB／T16417--19964煤炭可选性评定方法》自1997年实施至2009年已经执行14a,随着行业技术进步及标准化技术的发展,原标准已有许多方面不适应发展的需要,同时在结构、格式方面,也不符合GB／T1．1-2009的要求。概括介绍了国家标准GB／T16417-2011《煤炭可选性评定方法》,阐述了修订该标准的必要性和意义,并对标准主要内容进行了说明。     

不同煤阶煤的重介离心浮沉分选

对五种不同煤阶的煤样在25℃的条件下以苯和四氯化碳的混合液为重液进行重介离心浮沉分选,每个煤样从1.320g/cm3到1.459g/cm3分为五个密度级。根据浮沉试验结果绘制了可选性曲线,分析得出了煤的可选难易程度与煤阶无关,而与煤本身的性质有关。     

原煤可选性评定新方法——特定数量效率法

分析了现行几种煤炭可选性评定方法的适用范围及其局限性 ;提出采用特定条件下的数量效率作为煤炭可选性的评定方法。该方法可以克服现行评定标准存在的各种问题 ,适用于所有原煤在任何分选密度下的可选性评定 ,科学而简便 ,并且不会出现偏差。     

青海煤可选性的分析与评价

通过对青海2种原煤的煤质分析、浮沉试验,得到了原煤的可选性曲线,并对2种原煤进行了煤炭可选性评价,为今后2种煤炭的洗选设计提供数据支持。