基于分形级配对浮选精煤加压脱水影响研究
发布时间：2019-04-08 20:31
【摘要】：近年来,精煤产品水分偏高是我国选煤工业的一大难题,浮选精煤粒度过细是导致脱水难度大、精煤水分超标的主要原因。本论文经过查阅大量的文献资料,在总结前人研究的基础上,研究级配降低浮选精煤水分,搭建实验室正压脱水系统,设计安排试验,考察细粒浮选精煤不同细泥含量、不同细泥灰分、不同细度、间断级配和连续级配试验的脱水效果,研究分形理论并通过理论分析和试验验证得到颗粒表面水分与空隙水分分别与面积分维数和空隙分维数具有高度相关性。研究结果以及结论如下:1、细粒浮选精煤颗粒群的表面积和堆积空隙具有分形特征,因此分别建立了表面水分与面积分维数,空隙水分和空隙分维数的分形模型。2、级配中细泥含量对滤饼水分有极大影响,当级配中-0.045mm含量从30%逐渐到90%,滤饼水分也会逐渐从15.73%增加到31.63%。同时细泥灰分对滤饼水分也有一定影响,当细泥含量为50%时,总灰分每增加5%滤饼水分增加越1~2个百分点。3、在-0.125mm细颗粒群中加入不同粒度的粗颗粒,滤饼水分变化规律不同,只掺入1-0.5mm粒级产品时滤饼水分随着掺入量的增加逐渐降低,掺入量大于40%(水分15.75%)后降低缓慢;只掺入0.5-0.25mm粒级产品时滤饼水分随着掺入量的增加先降低后增加,掺入量为60%有最低水分15.36%;只掺入0.25-0.125mm粒级产品时滤饼水分随着掺入量的增加先降低后升高,掺入量为50%滤饼有最低水分19.20%。4、浮选精煤掺粗时1-0.5mm、0.5-0.25mm、0.25-0.125mm粒级产率分别不宜超过13.33%、20%、16.67%,过量掺粗反而恶化脱水效果。5、滤饼表面水与面积分维数Ds密切相关,相关方程为Y1=10.615Ds-13.143,其相关性系数为R12=0.8845。滤饼空隙水分与空隙分维数Dk也密切相关,相关方程为Y2=39.263Dk-63.564,相关性系数R22=0.8608。
[Abstract]:In recent years, the high moisture content of refined coal products is a difficult problem in China's coal preparation industry. The excessive fineness of flotation fine coal particles is the main cause of the difficulty of dewatering and the excessive water content of refined coal. In this paper, after consulting a large number of literature materials, on the basis of summarizing previous studies, the study of grading to reduce the water content of flotation concentrate coal, set up a laboratory positive pressure dewatering system, design and arrangement test, investigate the different fine slime content of fine-grained flotation concentrate coal, The dewatering effect of different fine mud ash, different fineness, discontinuous gradation and continuous gradation test, The fractal theory is studied and the theoretical analysis and experimental results show that the surface moisture and void moisture are highly correlated with the area fractal dimension and the void fractal dimension, respectively. The research results and conclusions are as follows: 1. The surface area and stacking void of fine-grained flotation fine coal particles have fractal characteristics, so the fractal models of surface moisture and area fractal dimension, void moisture content and void fractal dimension are established respectively. The content of fine mud had a great effect on the moisture content of filter cake. When the content of 0.045mm increased from 30% to 90%, the moisture content of cake gradually increased from 15.73% to 31.63%. At the same time, the ash content of fine mud also has a certain effect on the moisture content of filter cake. When the content of fine mud is 50%, the moisture content of filter cake increases by more than 1% for every 5% increase of total ash content. 3, the coarse particles with different particle sizes are added to the fine particle group of-0.125mm. The water content of filter cake was different, when only 1-0.5mm was added into the product, the water content of filter cake decreased gradually with the increase of adding quantity, and decreased slowly after adding more than 40% (water content 15.75%). The moisture content of filter cake decreased at first and then increased with the addition of 0.5-0.25mm. The minimum moisture content of the cake was 15.36% when the content was 60%. The moisture content of filter cake decreased at first and then increased with the increase of adding amount of 0.25-0.125mm. The minimum moisture content of 50% cake was 19.20%. When the flotation coal was mixed with coarse coal, the moisture content of filter cake was 0.5 mm, 0.5 mm and 0.25 mm respectively, and the water content of filter cake was 19.20%. The yield of 0.25-0.125mm particle size should not exceed 13.33%, 20%, 16.67%, respectively, and the dehydration effect is worsened by adding too much coarse. 5. The surface water of filter cake is closely related to the area fractal dimension Ds, the correlation equation is Y1, 10.615Ds, 13.143, and the relative equation is Y1, 10.615Ds, 13.143, respectively. The correlation coefficient was R _ (12) = 0.8845. The pore moisture content of filter cake is also closely related to the fractal dimension Dk of filter cake. The correlation equation is Y _ (2) ~ (2) 39.26 ~ (3D) K ~ (- 1) 63.564 and the correlation coefficient (R _ (22) is 0.8608.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD94
本文编号：2454900
[Abstract]:In recent years, the high moisture content of refined coal products is a difficult problem in China's coal preparation industry. The excessive fineness of flotation fine coal particles is the main cause of the difficulty of dewatering and the excessive water content of refined coal. In this paper, after consulting a large number of literature materials, on the basis of summarizing previous studies, the study of grading to reduce the water content of flotation concentrate coal, set up a laboratory positive pressure dewatering system, design and arrangement test, investigate the different fine slime content of fine-grained flotation concentrate coal, The dewatering effect of different fine mud ash, different fineness, discontinuous gradation and continuous gradation test, The fractal theory is studied and the theoretical analysis and experimental results show that the surface moisture and void moisture are highly correlated with the area fractal dimension and the void fractal dimension, respectively. The research results and conclusions are as follows: 1. The surface area and stacking void of fine-grained flotation fine coal particles have fractal characteristics, so the fractal models of surface moisture and area fractal dimension, void moisture content and void fractal dimension are established respectively. The content of fine mud had a great effect on the moisture content of filter cake. When the content of 0.045mm increased from 30% to 90%, the moisture content of cake gradually increased from 15.73% to 31.63%. At the same time, the ash content of fine mud also has a certain effect on the moisture content of filter cake. When the content of fine mud is 50%, the moisture content of filter cake increases by more than 1% for every 5% increase of total ash content. 3, the coarse particles with different particle sizes are added to the fine particle group of-0.125mm. The water content of filter cake was different, when only 1-0.5mm was added into the product, the water content of filter cake decreased gradually with the increase of adding quantity, and decreased slowly after adding more than 40% (water content 15.75%). The moisture content of filter cake decreased at first and then increased with the addition of 0.5-0.25mm. The minimum moisture content of the cake was 15.36% when the content was 60%. The moisture content of filter cake decreased at first and then increased with the increase of adding amount of 0.25-0.125mm. The minimum moisture content of 50% cake was 19.20%. When the flotation coal was mixed with coarse coal, the moisture content of filter cake was 0.5 mm, 0.5 mm and 0.25 mm respectively, and the water content of filter cake was 19.20%. The yield of 0.25-0.125mm particle size should not exceed 13.33%, 20%, 16.67%, respectively, and the dehydration effect is worsened by adding too much coarse. 5. The surface water of filter cake is closely related to the area fractal dimension Ds, the correlation equation is Y1, 10.615Ds, 13.143, and the relative equation is Y1, 10.615Ds, 13.143, respectively. The correlation coefficient was R _ (12) = 0.8845. The pore moisture content of filter cake is also closely related to the fractal dimension Dk of filter cake. The correlation equation is Y _ (2) ~ (2) 39.26 ~ (3D) K ~ (- 1) 63.564 and the correlation coefficient (R _ (22) is 0.8608.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD94
【参考文献】
相关期刊论文 前6条
1 王鲜霞;王彩贤;隋丽丽;;岩石介质的分形空隙模型及其维数解析[J];中北大学学报(自然科学版);2012年01期
2 尹小延;曾科;司琼磊;;微波能对化学污泥脱水性能的影响[J];化工设计;2009年06期
3 B.P.辛格;王立真;;颗粒表面现象对细粒净煤脱水的影响[J];国外选矿快报;1998年06期
4 王培铭;孙杰;刘贤萍;;粉煤灰-硅酸盐混合水泥粒度分布分形维数与其比表面积和抗压强度的关系[J];武汉理工大学学报;2011年04期
5 刘清侠,单忠健;阳离子有机硅乳液的合成及其对细粒煤的絮凝脱水作用[J];选煤技术;1991年02期
6 张英杰;巩冠群;谢广元;谢领辉;;细粒煤脱水研究综述[J];中国煤炭;2010年06期
相关博士学位论文 前1条
1 赵扬;滤饼微观结构与压榨过滤理论的研究[D];浙江大学;2006年
相关硕士学位论文 前1条
1 薛小刚;沥青混合料级配优化及配合比设计方法研究[D];长安大学;2005年
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