本文關(guān)鍵詞： 電動電位 煤泥水 伴生礦物 DLVO理論　出處：《太原理工大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：煤炭是我國的主體能源,濕法選煤造成大量待處理的煤泥水是影響選煤生產(chǎn)的關(guān)鍵因素,隨著采煤機(jī)械化程度的增加,原煤中矸石含量也在增加,矸石中所含的粘土礦物是選煤過程中產(chǎn)生大量難沉降煤泥水的主要原因。論文通過樣品的工業(yè)性分析、紅外光譜分析、激光粒度分析及X衍射分析等對西山煤電集團(tuán)馬蘭2#原煤的泥化特性、礦物賦存形式、粒度組成及礦物組成等進(jìn)行了分析,發(fā)現(xiàn)馬蘭2#原煤中所含礦物成分主要為蒙脫石、高嶺石、黃鐵礦和石英。其中,高嶺石與石英所占比例較大,原煤顆粒表面存在大量-OH、-C=O及-COOH等活性官能團(tuán)。在深入分析馬蘭2#原煤性質(zhì)基礎(chǔ)上,通過改變?nèi)芤簆 H值、水質(zhì)硬度、靜態(tài)混合時間及動態(tài)混合時間,設(shè)計(jì)單因素試驗(yàn),研究溶液性質(zhì)及能量輸入對原煤、不同粒度級煤樣、不同密度級煤樣、純煤(C)、高嶺土(K)、石英砂(Q)及其混合物電動電位的影響,結(jié)果表明:(1)各粒度級、密度級煤顆粒電動電位隨溶液性質(zhì)及能量輸入變化而變化的趨勢都基本相同。p H越小、水質(zhì)硬度越大、與水混合時間越短,原煤顆粒電動電位越大,顆粒表面帶電量越少。(2)溶液p H值增加時,礦物顆粒電動電位發(fā)生以下變化:純煤與高嶺土混合,高嶺土含量高時混合顆粒電動電位減小,且C:K=1:1、C:K=1:3在p H=7.22、p H=8.36處取得零點(diǎn)電位;純煤與石英砂混合礦物顆粒帶負(fù)電,顆粒表面帶電量隨之減少;高嶺土與石英砂混合礦物顆粒電動電位隨之增加,p H=7時顆粒表面帶電量最少,分別為 28.92mV、 26.73mV、隨著水質(zhì)硬度的提高,礦物顆粒表面Zeta電位都隨之增大,顆粒表面帶電量由所帶電荷性質(zhì)決定。(3)隨著靜態(tài)混合和動態(tài)混合時間的增加,純煤與高嶺土混合礦物顆粒電動電位隨時間的增加而增加;純煤與石英砂混合礦物顆粒電動電位隨時間先增加后減小,最大值處表面帶電量最少,分別為 18.57m V、 24.40mV、 30.77m V;高嶺土與石英砂混合礦物顆粒表面帶負(fù)電,且隨靜態(tài)混合時間的增加先減小后增加,時間等于24h處顆粒帶電量最少,分別為 30.64mV、 29.60m V、 23.72mV,隨動態(tài)混合時間的增加先增加后減小,在最大值處表面帶電量最少,分別為 19.05mV、 22.07mV、 22.58m V。以上試驗(yàn)結(jié)果對煤泥水中膠體顆粒分散理論的完善,選煤廠藥劑制度的確定,選煤廠煤泥水閉路循環(huán)的實(shí)現(xiàn)提供了理論依據(jù),具有十分重要的工業(yè)應(yīng)用價值。
[Abstract]:Coal is the main source of energy in our country. A large amount of coal slurry that needs to be treated by wet coal preparation is the key factor affecting the production of coal preparation. With the increase of mechanization of coal mining, the content of gangue in raw coal is also increasing. The clay minerals contained in the gangue are the main reasons for the production of a large amount of refractory slime water in the coal preparation process. Laser particle size analysis and X-ray diffraction analysis were carried out to analyze the mudding characteristics, mineral occurrence forms, granularity composition and mineral composition of Ma Lan 2# raw coal in Xishan Coal and Power Group. It was found that the mineral composition of Ma Lan 2# coal was mainly montmorillonite. Kaolinite, pyrite and quartz. Among them, kaolinite has a large proportion to quartz, and there are a large number of active functional groups such as -OH- OH- Cno and -COOH on the surface of raw coal particles. On the basis of in-depth analysis of the properties of Ma Lan 2# raw coal, the pH value of the solution is changed by changing the pH value of the solution. Water quality hardness, static mixing time and dynamic mixing time, single factor test was designed to study the effects of solution properties and energy input on raw coal, coal samples of different granularity and density, The effect of electromotive potential of pure coal, kaolinite, kaolinite, quartz sand and its mixture shows that the trend of the change of density coal particle electric potential with the change of solution property and energy input is basically the same as that of density grade coal particle at different granularity levels, the smaller the trend is, the smaller the electric potential of density grade coal particle is with the change of solution properties and energy input. The higher the hardness of water, the shorter the mixing time with water, the greater the electric potential of raw coal particles, the less charged amount of particle surface, the lower the pH value of solution), the following changes occur in the electric potential of mineral particles: pure coal mixed with kaolin, When the content of kaolin is high, the electrokinetic potential of mixed particles decreases, and the electric potential of mixed particles of pure coal and quartz sand decreases when the mixed mineral particles of pure coal and quartz sand have negative charge, and the electric potential of mixed particles in the mixture of pure coal and quartz sand decreases when the content of kaolin is high, and the electric potential of the mixed particle is obtained at the point of p H = 7.22 / p H = 8.36. The electric potential of mineral particles mixed with kaolin and quartz sand increased with the increase of electric potential, which was 28.92 MV and 26.73 MV, respectively. The surface Zeta potential of mineral particles increased with the increase of water hardness. The electric energy of the particle surface is determined by the charge properties of the particle. (3) with the increase of static mixing time and dynamic mixing time, the electric potential of pure coal and kaolin mixed mineral particles increases with the increase of time. The electric potential of mixed mineral particles of pure coal and quartz sand increases first and then decreases with time, and the surface electric energy at the maximum value is 18.57mV, 24.40mV, 30.77mV, respectively, and the surface of mixed mineral particles of kaolinite and quartz sand is negatively charged. With the increase of the static mixing time, the electric energy of the granular zone is the least, which is 30.64mV, 29.60mV, 23.72mV, respectively. With the increase of the dynamic mixing time, it increases first and then decreases, and the surface charge is the least at the maximum value. The above test results provide a theoretical basis for the improvement of the theory of colloidal particle dispersion in coal slurry, the determination of the preparation plant's medicament system and the realization of closed loop circulation of coal slurry in coal preparation plant, and have very important industrial application value.
【學(xué)位授予單位】：太原理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TD94

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本文編號：1536877