PIT微乳捕收剂的制备及其在低阶煤泥浮选中的应用研究
发布时间：2019-03-31 12:58
【摘要】：随着我国经济的高速发展,对煤炭资源的需求量不断增加,考虑到当前优质煤炭资源日渐短缺,高效开发利用占我国储量55%以上的低阶煤,成为应对煤炭资短缺的重要方法。由于低阶煤煤化程度低而易碎,加之开采机械化程度不断提高,产生煤泥量远高于中高等变质程度煤,要实现低阶煤泥的高效、低污染利用,浮选是非常重要的手段。但是由于低阶煤泥表面含氧官能团多、天然可浮性差且孔隙发达,造成传统烃油捕收剂耗量高、浮选效率低,限制了低阶煤资源的开发利用。因此,开发新型高效的低阶煤泥捕收剂,降低浮选生产成本,提高分选效果,对于我国低阶煤资源的高效开发利用意义重大。本文采用PIT微乳化工艺制备了 PIT微乳捕收剂;然后,针对神东集团神府-东胜矿区布尔台低阶煤泥开展了浮选性能研究,获得以其为核心的最佳浮选药剂制度,并与传统烃油捕收剂(柴油)的浮选效果进行了对比;最后,利用红外光谱分析、XPS、接触角等分析检测手段,揭示PIT微乳捕收剂的浮选作用机理。主要研究内容及结论如下:(1)以0#柴油为油相、op-10为主表面活性剂,采用拟三元相图法和电导法,重点考察了助表面活性剂种类、用量及微乳类型,确定了微乳配方范围。(2)基于微乳配方范围,采用响应面法进行了优化设计,以微乳粒径为评价指标,开展了响应面数据分析优化以及回归拟合,并对最优配方进行了验证确定了微乳捕收剂基础配方:op-10:正戊醇:0#柴油:水=18.25:18.25:35.5:28(3)针对微乳基础配方,通过升温电导率法查明了其相转变温度为80℃,在此基础上,采用相转变温度法(PIT法),以微乳粒径为评价指标,考察并确定了 PIT法的初始温度为78℃,所制备的PIT微乳捕收剂粒径为29.30nm,比普通微乳捕收剂降低5nm,放置8个月仍保持稳定状态。(4)低阶煤泥浮选试验表明,PIT微乳捕收剂在用量2kg/t、起泡剂用量0.17kg/t的条件下,可以获得精煤产率48.42%、灰分12.64%、可燃体回收率58.43%的分选指标;与传统烃油捕收剂(0#柴油)相比,在精煤灰分相近的前提下,PIT微乳捕收剂的精煤产率增加了约13%、可燃体回收率提高了约16%,用量节省了 66.67%,起泡剂用量节省了 71.67%,而且PIT微乳捕收剂的综合成本只有0#柴油的三分之一。(5)低阶煤泥浮选机理研究表明,经过PIT微乳捕收剂的作用,低阶煤泥表面的含氧官能团被显著覆盖,尤其易与C-O官能团(羟基、醚基)以氢键方式结合;接触角由46.28°提高至55.32°,说明煤泥表面疏水性显著增强,有效提高了低阶煤泥的可浮性。
[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，
本文编号：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，
本文编号：2450922
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