【摘要】：近年來(lái),精煤產(chǎn)品水分偏高是我國(guó)選煤工業(yè)的一大難題,浮選精煤粒度過(guò)細(xì)是導(dǎo)致脫水難度大、精煤水分超標(biāo)的主要原因。本論文經(jīng)過(guò)查閱大量的文獻(xiàn)資料,在總結(jié)前人研究的基礎(chǔ)上,研究級(jí)配降低浮選精煤水分,搭建實(shí)驗(yàn)室正壓脫水系統(tǒng),設(shè)計(jì)安排試驗(yàn),考察細(xì)粒浮選精煤不同細(xì)泥含量、不同細(xì)泥灰分、不同細(xì)度、間斷級(jí)配和連續(xù)級(jí)配試驗(yàn)的脫水效果,研究分形理論并通過(guò)理論分析和試驗(yàn)驗(yàn)證得到顆粒表面水分與空隙水分分別與面積分維數(shù)和空隙分維數(shù)具有高度相關(guān)性。研究結(jié)果以及結(jié)論如下:1、細(xì)粒浮選精煤顆粒群的表面積和堆積空隙具有分形特征,因此分別建立了表面水分與面積分維數(shù),空隙水分和空隙分維數(shù)的分形模型。2、級(jí)配中細(xì)泥含量對(duì)濾餅水分有極大影響,當(dāng)級(jí)配中-0.045mm含量從30%逐漸到90%,濾餅水分也會(huì)逐漸從15.73%增加到31.63%。同時(shí)細(xì)泥灰分對(duì)濾餅水分也有一定影響,當(dāng)細(xì)泥含量為50%時(shí),總灰分每增加5%濾餅水分增加越1~2個(gè)百分點(diǎn)。3、在-0.125mm細(xì)顆粒群中加入不同粒度的粗顆粒,濾餅水分變化規(guī)律不同,只摻入1-0.5mm粒級(jí)產(chǎn)品時(shí)濾餅水分隨著摻入量的增加逐漸降低,摻入量大于40%(水分15.75%)后降低緩慢;只摻入0.5-0.25mm粒級(jí)產(chǎn)品時(shí)濾餅水分隨著摻入量的增加先降低后增加,摻入量為60%有最低水分15.36%;只摻入0.25-0.125mm粒級(jí)產(chǎn)品時(shí)濾餅水分隨著摻入量的增加先降低后升高,摻入量為50%濾餅有最低水分19.20%。4、浮選精煤摻粗時(shí)1-0.5mm、0.5-0.25mm、0.25-0.125mm粒級(jí)產(chǎn)率分別不宜超過(guò)13.33%、20%、16.67%,過(guò)量摻粗反而惡化脫水效果。5、濾餅表面水與面積分維數(shù)Ds密切相關(guān),相關(guān)方程為Y1=10.615Ds-13.143,其相關(guān)性系數(shù)為R12=0.8845。濾餅空隙水分與空隙分維數(shù)Dk也密切相關(guān),相關(guān)方程為Y2=39.263Dk-63.564,相關(guān)性系數(shù)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.
【學(xué)位授予單位】：中國(guó)礦業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：TD94

【參考文獻(xiàn)】

相關(guān)期刊論文 前6條

1 王鮮霞;王彩賢;隋麗麗;;巖石介質(zhì)的分形空隙模型及其維數(shù)解析[J];中北大學(xué)學(xué)報(bào)(自然科學(xué)版);2012年01期

2 尹小延;曾科;司瓊磊;;微波能對(duì)化學(xué)污泥脫水性能的影響[J];化工設(shè)計(jì);2009年06期

3 B.P.辛格;王立真;;顆粒表面現(xiàn)象對(duì)細(xì)粒凈煤脫水的影響[J];國(guó)外選礦快報(bào);1998年06期

4 王培銘;孫杰;劉賢萍;;粉煤灰-硅酸鹽混合水泥粒度分布分形維數(shù)與其比表面積和抗壓強(qiáng)度的關(guān)系[J];武漢理工大學(xué)學(xué)報(bào);2011年04期

5 劉清俠,單忠健;陽(yáng)離子有機(jī)硅乳液的合成及其對(duì)細(xì)粒煤的絮凝脫水作用[J];選煤技術(shù);1991年02期

6 張英杰;鞏冠群;謝廣元;謝領(lǐng)輝;;細(xì)粒煤脫水研究綜述[J];中國(guó)煤炭;2010年06期

相關(guān)博士學(xué)位論文 前1條

1 趙揚(yáng);濾餅微觀結(jié)構(gòu)與壓榨過(guò)濾理論的研究[D];浙江大學(xué);2006年

相關(guān)碩士學(xué)位論文 前1條

1 薛小剛;瀝青混合料級(jí)配優(yōu)化及配合比設(shè)計(jì)方法研究[D];長(zhǎng)安大學(xué);2005年

，

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