本文選題：低階煤　切入點：可浮性　出處：《中國礦業(yè)大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：我國煤炭資源儲量豐富,處于低變質(zhì)階段的低階煤占我國已探明煤炭儲量的55%以上。隨著國內(nèi)能源需求日益增大和優(yōu)質(zhì)煤炭資源銳減,在可預(yù)見的未來,低階煤的轉(zhuǎn)化綜合利用將成為支撐未來能源需求的潛力所在。低階煤因其含氧官能團多,表面疏水性差,其煤泥難以浮選,而細粒煤泥的難處理是制約煤炭企業(yè)經(jīng)濟發(fā)展的重要原因之一。煤泥浮選是低階煤煤泥提質(zhì)利用的可靠技術(shù)手段,但因其常規(guī)浮選難以進行,故本論文以朔州劉家口選煤廠煤泥為例,利用新型捕收劑FO和變徑組合充氣浮選柱來解決低階煤煤泥浮選問題,并探討了新型捕收劑FO改善低階煤煤泥可浮性的機理。論文主要研究內(nèi)容如下:本論文通過工業(yè)分析與元素分析、紅外光譜分析、粒度分析、密度分析等,得到了劉家口選煤廠煤泥的基本性質(zhì):煤結(jié)構(gòu)分子中烷基側(cè)鏈多,芳香核含量較少,煤中含有較多的含氧官能團;粒度組成表明煤泥細粒級含量大,需要選擇高效分選設(shè)備對其分選;密度組成表明該煤泥通過分選有望獲得高產(chǎn)率的合格精煤摻入重選末精煤,實現(xiàn)煤泥的合理利用。煤泥接觸角測定表明該煤泥接觸角較小,天然可浮性差,常規(guī)浮選需要加入大量的捕收劑才能改善其表面疏水性,該煤泥要獲得經(jīng)濟有效分選,需尋求新的浮選藥劑。在實驗室使用輕柴油對劉家口選煤廠煤泥進行了常規(guī)浮選試驗研究,研究表明:浮選藥劑消耗高,精煤產(chǎn)率低,可燃體回收率低。當浮選濃度80g/L,捕收劑輕柴油用量3000g/t,起泡劑仲辛醇用量600g/t時,浮選精煤灰分為14.57%,精煤產(chǎn)率為60.68%,尾煤灰分為57.72%,可燃體回收率為75.72%。使用新型捕收劑FO進行浮選機浮選試驗研究,研究表明:新型捕收劑FO浮選試驗結(jié)果要明顯優(yōu)于輕柴油浮選試驗結(jié)果。當浮選濃度80g/L,捕收劑用量2500g/t,起泡劑用量400g/t時,浮選精煤灰分為17.42%,精煤產(chǎn)率為71.81%,精煤高位發(fā)熱量為5779cal/g,尾煤灰分為67.07%,可燃體回收率為86.46%。利用FTIR和XPS分析了新型捕收劑FO的作用機理,研究表明:新型捕收劑FO含有一定量的含氧基團,新型捕收劑FO中的羥基基團最可能與煤泥表面的C-O基團發(fā)生弱氫鍵鍵合,因此可以改善煤泥的可浮性。對劉家口選煤廠煤泥進行新型捕收劑FO和變徑組合充氣浮選柱實驗室浮選試驗,取得了較好的浮選指標。當新型捕收劑FO用量為2500g/t,起泡劑用量為400g/t,浮選給料量400ml/min,中礦循環(huán)壓力0.20MPa,微孔陶瓷充氣壓力0.12MPa,礦漿濃度為80g/L時,可以得到灰分17.72%,產(chǎn)率74.42%,高位發(fā)熱量為5746cal/g的精煤,尾煤灰分69.74%,可燃體回收率88.78%。利用新型捕收劑FO和變徑組合充氣浮選柱在劉家口選煤廠進行半工業(yè)試驗,試驗結(jié)果表明:采用新型捕收劑FO替代輕柴油作捕收劑可明顯降低藥劑用量,在給料量5m3/h,新型捕收劑FO用量2000g/t,起泡劑用量600g/t條件下,入料灰分25.44%,浮選精煤灰分為14.37%,精煤產(chǎn)率80.03%,精煤高位發(fā)熱量為6131cal/g,尾煤灰分69.81%,可燃體回收率91.91%。在實驗室和半工業(yè)條件下驗證了使用新型捕收劑FO和變徑組合充氣浮選柱浮選能很好的解決劉家口選煤廠低階煤煤泥浮選困難、藥劑消耗高的問題,為低階煤煤泥浮選提供了一種可靠的技術(shù)手段。
[Abstract]:The coal resource is abundant in our country, in the low rank coal of low metamorphic stage accounted for China's proven coal reserves of 55%. With the increasing demand for domestic energy and high-quality coal resources dropped, in the foreseeable future, will become the future source of demand to support the potential of comprehensive utilization of low rank coal into low order. Coal because of the oxygen containing functional groups, surface hydrophobicity, the slime to flotation, and fine coal treatment difficult is one of the important factors restricting the economic development of coal industry. Coal flotation is the low order reliable technology upgrading and utilization of coal slime, but because of the conventional flotation is difficult, so this paper takes Shuozhou Liu Jia Kou coal slime as an example, the use of new collector FO and variable combination inflatable flotation column to solve the problem of low rank coal slime flotation, and discusses the new collector FO to improve the low rank coal slime flotation mechanism of the main. Research contents are as follows: through the analysis of the industrial analysis and elemental analysis of grain size, infrared spectrum analysis, density analysis, the basic properties of Liu Jia Kou coal slime: alkyl side chain in coal molecular structure, less aromatic nucleus content, contain more oxygen functional groups in coal; particle size showed fine slime the content level, need to choose a high efficiency separation equipment of the separation; the density shows that the slime by sorting is expected to get high yield of qualified coal mixed with gravity end coal, rational use of coal slime. The slime contact angle measurement show that the slime contact angle is smaller, the natural floatability, conventional flotation requires large amount of fishing collectors can improve its surface hydrophobicity, the slurry to obtain effective separation, to seek new flotation reagents of Liu Jia Kou coal slime by using conventional floating light diesel oil in the laboratory The testing research, research shows that high consumption of coal flotation reagents, low yield, low recovery rate of the combustible. When the concentration of 80g/L flotation collector, light diesel oil consumption 3000g/t, foaming agent dosage 600g/t octanol, the ash content of flotation concentrate is 14.57%, the yield of clean coal is 60.68%, the ash of tailings is 57.72%, the recovery of combustibles 75.72%. use of new collector FO were studied. The research shows that the flotation machine flotation with FO test results to the test results of flotation is better than diesel. When the concentration of 80g/L flotation, collector dosage of 2500g/t foaming agent with the amount of 400g/t, the ash content of flotation concentrate is 17.42%, the yield of clean coal is 71.81%, high coal calorific value 5779cal/g, the ash of tailings is 67.07%, the recovery of combustibles for 86.46%. using FTIR and XPS analysis of a new trapping mechanism, collector FO research shows that new collector oxygen groups collector FO contains a certain amount of new. Type of collector hydroxyl groups in FO agent most likely weak hydrogen bonding and C-O groups of coal surface, so it can improve the floatability of coal slime. Liu Jia Kou coal slime of new collector FO and variable combination inflatable laboratory flotation test, and achieved good flotation index when new. The collector FO dosage of 2500g/t, foaming agent 400g/t, flotation feeding 400ml/min, middling cycle pressure 0.20MPa, microporous ceramic gas pressure 0.12MPa, pulp concentration is 80g/L, can get 17.72% ash and 74.42% yield, high calorific value 5746cal/g of coal, coal 69.74%, the recovery of combustibles by 88.78%. the new collector FO and variable combination inflatable flotation column semi industrial experiment in Liu Jia Kou coal preparation plant, experimental results show that the new collector FO instead of light diesel oil as collector can reduce the dosage of the drug, to The quantity of material 5m3/h, the new collector FO dosage of 2000g/t, the amount of foaming agent under the condition of 600g/t, feeding 25.44% ash content, the ash content of flotation concentrate is 14.37%, coal 80.03%, coal high calorific value 6131cal/g, coal 69.81%, the recovery of combustibles in the 91.91%. lab and semi industrial conditions to verify the use of new collector collector FO and variable combination inflatable flotation can be a good solution to Liu Jia Kou coal preparation plant of low rank coal slime flotation is difficult, the problem of high consumption of reagents, the technology provides a reliable means for the low rank coal slime flotation.

【學(xué)位授予單位】：中國礦業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TD94;TD923

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