發(fā)布時(shí)間：2018-07-17 04:06

【摘要】：煤泥是煤炭洗選加工的副產(chǎn)品,熱值約為12~21MJ/kg,高于煤矸石、污泥、低階煤等劣質(zhì)染料;煤泥產(chǎn)量大,約為煤炭開(kāi)采量的7%~14%,處理不當(dāng)會(huì)對(duì)環(huán)境造成巨大污染、對(duì)能源造成巨大浪費(fèi)。因此,發(fā)展、完善煤泥深度提質(zhì)利用技術(shù)具有廣泛的前景及必要性。課題以?xún)?nèi)蒙古串草圪旦煤礦洗選煤泥為研究對(duì)象,分別從干燥脫水、熱解脫氧、分選脫灰的角度對(duì)煤泥深度復(fù)合提質(zhì)過(guò)程進(jìn)行研究,優(yōu)化各過(guò)程關(guān)鍵參數(shù)并初步擬定煤泥深度復(fù)合提質(zhì)工藝,進(jìn)行經(jīng)濟(jì)性估算,研究的主要內(nèi)容如下:1)對(duì)串礦煤泥進(jìn)行工業(yè)分析、元素分析、粒度分析、紅外光譜分析、X射線(xiàn)衍射分析等煤泥基礎(chǔ)性質(zhì)評(píng)價(jià),研究結(jié)果表明:煤泥濾餅水分為28.74%,內(nèi)水分為3.71%,煤泥水分大多以游離水的形式吸附在煤泥顆粒表面;煤泥粒度較細(xì),主導(dǎo)粒級(jí)為0~75μm,含量約為60.98%;煤泥中灰分含量高且主要為高嶺土等粘土礦物。2)通過(guò)非等溫?zé)嶂貙?shí)驗(yàn)、恒溫干燥實(shí)驗(yàn)對(duì)散狀煤泥的理想干燥特性及團(tuán)狀煤泥的工藝干燥特性進(jìn)行研究。目標(biāo)水分為15%時(shí),確定實(shí)驗(yàn)條件下煤泥干燥的最優(yōu)溫度區(qū)間為180~200℃,干燥時(shí)間為5~10min,粒徑為8~10mm。3)對(duì)干燥煤泥進(jìn)行等溫和非等溫條件下的熱解特性實(shí)驗(yàn)研究,并對(duì)熱解半焦表面官能團(tuán)結(jié)構(gòu)進(jìn)行FTIR分析,研究結(jié)果表明:熱解反應(yīng)劇烈溫度區(qū)間為400~600℃、時(shí)間區(qū)間為10~20min。在450℃時(shí)熱解反應(yīng)速率最大,C-H、C=O官能團(tuán)以揮發(fā)分的形式脫除,C-H的脫除導(dǎo)致大量烴類(lèi)氣體析出,C=O的脫除導(dǎo)致半焦的水分復(fù)吸特性有所改善。4)基于煤泥熱解半焦的可選性?xún)?yōu)化熱解參數(shù),研究結(jié)果表明:熱解使煤泥半焦的密度差更明顯,分選特性得到改善。隨著熱解溫度、時(shí)間的增加分選特性提高,且溫度對(duì)分選特性的影響程度大于時(shí)間,確定最優(yōu)熱解參數(shù)為熱解溫度550℃、熱解時(shí)間20min。5)煤泥深度復(fù)合提質(zhì)工藝初步擬定及經(jīng)濟(jì)性估算。
[Abstract]:Coal slime is a by-product of coal washing and processing, and its calorific value is about 12 ~ 21MJ / kg, which is higher than that of coal gangue, sludge, low-rank coal and other inferior dyes. Therefore, it is necessary and promising to develop and improve the technology of coal slime utilization. In this paper, the coal slime in Cangcao Gedan Coal Mine, Inner Mongolia, is taken as the research object, and the process of coal slime depth compound extraction is studied from the angles of drying, dehydration, pyrolysis and deoxidation, separation and deashing, respectively. The key parameters of each process are optimized and the process of coal slime depth compound quality is preliminarily drawn up for economic estimation. The main contents of the study are as follows: 1) Industrial analysis, element analysis, particle size analysis of coal slime, The basic properties of coal slime were evaluated by infrared spectrum analysis and X-ray diffraction analysis. The results show that the slurry filter cake water is divided into 28.74 and 3.71, and the slime water is mostly adsorbed on the surface of the slime particles in the form of free water, and the slime size is fine, The main particle size is 0 ~ 75 渭 m, the content is about 60.98, the ash content in the coal slime is high and the clay minerals such as kaolin are mainly used. The ideal drying characteristics of the granular slime and the technological drying characteristics of the agglomerated slime are studied by non-isothermal thermogravimetric experiment and isothermal drying experiment. When the target water is divided into 15 parts, the optimum temperature range of coal slime drying under experimental conditions is determined to be 180 ~ 200 鈩，

本文編號(hào)：2128938