PIT微乳捕收劑的制備及其在低階煤泥浮選中的應(yīng)用研究
發(fā)布時(shí)間：2019-03-31 12:58
【摘要】：隨著我國(guó)經(jīng)濟(jì)的高速發(fā)展,對(duì)煤炭資源的需求量不斷增加,考慮到當(dāng)前優(yōu)質(zhì)煤炭資源日漸短缺,高效開發(fā)利用占我國(guó)儲(chǔ)量55%以上的低階煤,成為應(yīng)對(duì)煤炭資短缺的重要方法。由于低階煤煤化程度低而易碎,加之開采機(jī)械化程度不斷提高,產(chǎn)生煤泥量遠(yuǎn)高于中高等變質(zhì)程度煤,要實(shí)現(xiàn)低階煤泥的高效、低污染利用,浮選是非常重要的手段。但是由于低階煤泥表面含氧官能團(tuán)多、天然可浮性差且孔隙發(fā)達(dá),造成傳統(tǒng)烴油捕收劑耗量高、浮選效率低,限制了低階煤資源的開發(fā)利用。因此,開發(fā)新型高效的低階煤泥捕收劑,降低浮選生產(chǎn)成本,提高分選效果,對(duì)于我國(guó)低階煤資源的高效開發(fā)利用意義重大。本文采用PIT微乳化工藝制備了 PIT微乳捕收劑;然后,針對(duì)神東集團(tuán)神府-東勝礦區(qū)布爾臺(tái)低階煤泥開展了浮選性能研究,獲得以其為核心的最佳浮選藥劑制度,并與傳統(tǒng)烴油捕收劑(柴油)的浮選效果進(jìn)行了對(duì)比;最后,利用紅外光譜分析、XPS、接觸角等分析檢測(cè)手段,揭示PIT微乳捕收劑的浮選作用機(jī)理。主要研究?jī)?nèi)容及結(jié)論如下:(1)以0#柴油為油相、op-10為主表面活性劑,采用擬三元相圖法和電導(dǎo)法,重點(diǎn)考察了助表面活性劑種類、用量及微乳類型,確定了微乳配方范圍。(2)基于微乳配方范圍,采用響應(yīng)面法進(jìn)行了優(yōu)化設(shè)計(jì),以微乳粒徑為評(píng)價(jià)指標(biāo),開展了響應(yīng)面數(shù)據(jù)分析優(yōu)化以及回歸擬合,并對(duì)最優(yōu)配方進(jìn)行了驗(yàn)證確定了微乳捕收劑基礎(chǔ)配方:op-10:正戊醇:0#柴油:水=18.25:18.25:35.5:28(3)針對(duì)微乳基礎(chǔ)配方,通過升溫電導(dǎo)率法查明了其相轉(zhuǎn)變溫度為80℃,在此基礎(chǔ)上,采用相轉(zhuǎn)變溫度法(PIT法),以微乳粒徑為評(píng)價(jià)指標(biāo),考察并確定了 PIT法的初始溫度為78℃,所制備的PIT微乳捕收劑粒徑為29.30nm,比普通微乳捕收劑降低5nm,放置8個(gè)月仍保持穩(wěn)定狀態(tài)。(4)低階煤泥浮選試驗(yàn)表明,PIT微乳捕收劑在用量2kg/t、起泡劑用量0.17kg/t的條件下,可以獲得精煤產(chǎn)率48.42%、灰分12.64%、可燃體回收率58.43%的分選指標(biāo);與傳統(tǒng)烴油捕收劑(0#柴油)相比,在精煤灰分相近的前提下,PIT微乳捕收劑的精煤產(chǎn)率增加了約13%、可燃體回收率提高了約16%,用量節(jié)省了 66.67%,起泡劑用量節(jié)省了 71.67%,而且PIT微乳捕收劑的綜合成本只有0#柴油的三分之一。(5)低階煤泥浮選機(jī)理研究表明,經(jīng)過PIT微乳捕收劑的作用,低階煤泥表面的含氧官能團(tuán)被顯著覆蓋,尤其易與C-O官能團(tuán)(羥基、醚基)以氫鍵方式結(jié)合;接觸角由46.28°提高至55.32°,說明煤泥表面疏水性顯著增強(qiáng),有效提高了低階煤泥的可浮性。
[Abstract]:With the rapid development of China's economy, the demand for coal resources continues to increase. Considering the increasing shortage of high-quality coal resources, the efficient exploitation and utilization of low-rank coal, which accounts for more than 55% of China's reserves, has become an important way to deal with the shortage of coal resources. Because of the low degree of coal composting and fragility, and the increasing degree of mechanization of mining, the amount of coal slime produced is much higher than that of the coal of middle and high metamorphic degree. To realize the high efficiency and low pollution utilization of low grade coal slime, flotation is a very important means. However, due to the large number of oxygen-containing functional groups on the surface of low-order coal slime, poor natural floatability and well-developed pores, the traditional hydrocarbon oil collector has high consumption and low flotation efficiency, which limits the exploitation and utilization of low-rank coal resources. Therefore, it is of great significance to develop a new type of low-grade coal slime collector, reduce the production cost of flotation, and improve the separation effect, which is of great significance for the efficient development and utilization of low-rank coal resources in China. In this paper, PIT microemulsion collector was prepared by Pitt microemulsion process. Then, the flotation performance of Bootai low-grade coal slime in Shenfu-Dongsheng mining area of Shendong Group was studied, and the optimum flotation reagent system with its core was obtained, and the flotation effect was compared with that of traditional hydrocarbon oil collector (diesel oil). Finally, the flotation mechanism of PIT microemulsion collector was revealed by means of infrared spectrum analysis and XPS, contact angle analysis. The main contents and conclusions are as follows: (1) using 0 # diesel oil as the oil phase and op-10 as the main surfactant, the types, dosage and microemulsion types of cosurfactants were investigated by pseudo-ternary phase diagram and conductivity method. The range of microemulsion formulation was determined. (2) based on the range of microemulsion formulation, the response surface method was used to optimize the design, and the response surface data analysis and regression fitting were carried out with the microemulsion particle size as the evaluation index. The optimal formulation was verified to determine the basic formula of microemulsion collector: op-10: n-amyl alcohol: 0 # diesel oil: water = 18.25? 18.25? 35.5? (3) for microemulsion basic formula, the optimal formulation of microemulsion collector was determined as op-10: n-pentanol: 0 # diesel oil: water = 18.25? 18.25? The phase transition temperature was found to be 80 鈩，
本文編號(hào)：2450922
[Abstract]:With the rapid development of China's economy, the demand for coal resources continues to increase. Considering the increasing shortage of high-quality coal resources, the efficient exploitation and utilization of low-rank coal, which accounts for more than 55% of China's reserves, has become an important way to deal with the shortage of coal resources. Because of the low degree of coal composting and fragility, and the increasing degree of mechanization of mining, the amount of coal slime produced is much higher than that of the coal of middle and high metamorphic degree. To realize the high efficiency and low pollution utilization of low grade coal slime, flotation is a very important means. However, due to the large number of oxygen-containing functional groups on the surface of low-order coal slime, poor natural floatability and well-developed pores, the traditional hydrocarbon oil collector has high consumption and low flotation efficiency, which limits the exploitation and utilization of low-rank coal resources. Therefore, it is of great significance to develop a new type of low-grade coal slime collector, reduce the production cost of flotation, and improve the separation effect, which is of great significance for the efficient development and utilization of low-rank coal resources in China. In this paper, PIT microemulsion collector was prepared by Pitt microemulsion process. Then, the flotation performance of Bootai low-grade coal slime in Shenfu-Dongsheng mining area of Shendong Group was studied, and the optimum flotation reagent system with its core was obtained, and the flotation effect was compared with that of traditional hydrocarbon oil collector (diesel oil). Finally, the flotation mechanism of PIT microemulsion collector was revealed by means of infrared spectrum analysis and XPS, contact angle analysis. The main contents and conclusions are as follows: (1) using 0 # diesel oil as the oil phase and op-10 as the main surfactant, the types, dosage and microemulsion types of cosurfactants were investigated by pseudo-ternary phase diagram and conductivity method. The range of microemulsion formulation was determined. (2) based on the range of microemulsion formulation, the response surface method was used to optimize the design, and the response surface data analysis and regression fitting were carried out with the microemulsion particle size as the evaluation index. The optimal formulation was verified to determine the basic formula of microemulsion collector: op-10: n-amyl alcohol: 0 # diesel oil: water = 18.25? 18.25? 35.5? (3) for microemulsion basic formula, the optimal formulation of microemulsion collector was determined as op-10: n-pentanol: 0 # diesel oil: water = 18.25? 18.25? The phase transition temperature was found to be 80 鈩，
本文編號(hào)：2450922
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