基于响应面法优化SDBS对低阶煤泥浮选的促进作用
|
摘要
针对低阶煤表面含氧官能团多,传统浮选药剂分选效果较差的难题,采用阴离子表面活性剂十二烷基苯磺酸钠(SDBS)作为浮选促进剂开展了低阶煤浮选试验研究。通过单因素条件试验,确定适宜的柴油和SDBS用量分别为6～9 kg/t和800～1 500 g/t,仲辛醇与柴油用量比为1∶10～1∶5。在此基础上,采用响应面法对柴油、仲辛醇和SDBS的用量进行优化,优化试验结果表明,柴油、仲辛醇、SDBS之间存在交互作用,其主效应关系为:SDBS>柴油>仲辛醇,并获得了以浮选完善度为响应值的二阶回归方程,确定了柴油、仲辛醇、SDBS的最佳用量分别为8. 57 kg/t、1. 28 kg/t、1 307 g/t,此时浮选完善度的理论值为24. 16%,在最优药剂用量条件下开展了浮选验证试验,获得的浮选完善度为23. 98%,与响应面法得到的理论值基本相符,表明采用响应面法优化药剂制度准确可行。XPS宽程扫描检测结果表明,低阶煤表面的氧碳比为1. 40%,吸附SDBS、柴油和柴油+SDBS后,氧碳比分别降至1. 26%、1. 12%和1. 01%; XPS C1s分析结果表明,低阶煤表面的C—C/C—H基团含量为66. 47%,吸附SDBS、柴油和柴油+SDBS后,分别提高到72. 60%、75. 13%和77. 12%;吸附前后,低阶煤表面含氧官能团含量均明显降低,C—O基团含量由吸附前的16. 59%分别降低至15. 71%、14. 66%和12. 71%,C O基团由10. 09%分别降低至7. 70%、4. 23%和5. 64%,O C—O基团由6. 85%分别降低至3. 99%、5. 98%和4. 54%。XPS检测结果表明,将柴油和SDBS复配使用,作用效果优于单独使用柴油和SDBS。SDBS作为促进剂时,低阶煤表面C—C/C—H基团含量的增加以及含氧官能团含量的降低,表明SDBS与低阶煤表面发生了以氢键吸附为主的物理吸附,实现了对低阶煤表面含氧官能团的有效覆盖,同时,SDBS中的C—C/C—H基团暴露在低阶煤表面,增强了低阶煤表面的疏水性,有利于改善低阶煤泥的可浮性。
In order to solve the problem that there are many oxygen-containing functional groups on the surface of low-rank coal and the separation effect of traditional flotation agents is poor,the low rank coal flotation experiment was carried out by using the anionic surfactant SDBS as flotation promoter.By single factor condition test,the suitable range of diesel oil and SDBS dosage were determined to be 6-9 kg/t and 800-1 500 g/t respectively,and the ratio of sec-octanol to diesel oil dosage was 1 ∶ 10-1 ∶ 5. On this basis,the response surface method was used to optimize the amount of diesel,sec-octyl alcohol and SDBS.The optimization test results show that there is an interaction among diesel,sec-octyl alcohol and SDBS,and the main effect relationship was as follows: SDBS>diesel>sec-octyl alcohols,and the second order regression equation with flotation perfect degree as the response values is obtained,which determines the best dosage of diesel,sec-octyl alcohols,SDBS to be 8. 57 kg,1. 28 kg/t,1 307 g/t,respectively.At this time,the theoretical value of the flotation perfect degree is 24. 16%.Under the condition of the optimal dosage of reagents,the flotation experiment was carried out. The obtained flotation perfect degree is 23. 98%,which is consistent with the theoretical value of the response surface methodvalue.The results show that the response surface method used to optimize agent system is accurate and feasible.The XPS wide-range scanning test results show that the oxygen-carbon ratio on the surface of low-rank coal is 1.40%.After adsorbing SDBS,diesel oil and diesel oil+SDBS,the oxygen-carbon ratio decrease to 1. 26%,1. 12% and 1. 01%,respectively.XPS C1 s analysis results show that the content of C—C/C—H group on the surface of low-rank coal is 66. 47%.After adsorbing SDBS,diesel oil and diesel oil+SDBS,the oxygen-carbon ratio increase to 72. 60%,75. 13%and 77. 12%,respectively.Before and after adsorption,the content of oxygen-containing functional groups on the surface of low-rank coal decreases significantly,the content of C—O group decreases from 16. 59% before adsorption to 15. 71%,14. 66% and 12. 71%,the content of C O group decreases from 10.09% to 7. 70%,4. 23% and 5.64%,and the content of O C—O group decreases from 6. 85% to3. 99%,5. 98% and 4.54%,respectively.The XPS test results show that the combined use of diesel and SDBS is better than that of diesel and SDBS alone.When SDBS as promoter,the content of C—C/C—H groups on the surface of low rank coal increases and the content of oxygen containing functional groups decreases,which indicates that the hydrogen bonding adsorption is the main physical adsorption of SDBS on the surface of low rank coal,the effective implementation of oxygen containing functional groups in low rank coal surface is realized,at the same time,C—C/C—H groups of SDBS expose on the surface of low rank coal enhance the hydrophobicity of low rank coal surface,which helps improve the flotability of low rank coal slime.
In order to solve the problem that there are many oxygen-containing functional groups on the surface of low-rank coal and the separation effect of traditional flotation agents is poor,the low rank coal flotation experiment was carried out by using the anionic surfactant SDBS as flotation promoter.By single factor condition test,the suitable range of diesel oil and SDBS dosage were determined to be 6-9 kg/t and 800-1 500 g/t respectively,and the ratio of sec-octanol to diesel oil dosage was 1 ∶ 10-1 ∶ 5. On this basis,the response surface method was used to optimize the amount of diesel,sec-octyl alcohol and SDBS.The optimization test results show that there is an interaction among diesel,sec-octyl alcohol and SDBS,and the main effect relationship was as follows: SDBS>diesel>sec-octyl alcohols,and the second order regression equation with flotation perfect degree as the response values is obtained,which determines the best dosage of diesel,sec-octyl alcohols,SDBS to be 8. 57 kg,1. 28 kg/t,1 307 g/t,respectively.At this time,the theoretical value of the flotation perfect degree is 24. 16%.Under the condition of the optimal dosage of reagents,the flotation experiment was carried out. The obtained flotation perfect degree is 23. 98%,which is consistent with the theoretical value of the response surface methodvalue.The results show that the response surface method used to optimize agent system is accurate and feasible.The XPS wide-range scanning test results show that the oxygen-carbon ratio on the surface of low-rank coal is 1.40%.After adsorbing SDBS,diesel oil and diesel oil+SDBS,the oxygen-carbon ratio decrease to 1. 26%,1. 12% and 1. 01%,respectively.XPS C1 s analysis results show that the content of C—C/C—H group on the surface of low-rank coal is 66. 47%.After adsorbing SDBS,diesel oil and diesel oil+SDBS,the oxygen-carbon ratio increase to 72. 60%,75. 13%and 77. 12%,respectively.Before and after adsorption,the content of oxygen-containing functional groups on the surface of low-rank coal decreases significantly,the content of C—O group decreases from 16. 59% before adsorption to 15. 71%,14. 66% and 12. 71%,the content of C O group decreases from 10.09% to 7. 70%,4. 23% and 5.64%,and the content of O C—O group decreases from 6. 85% to3. 99%,5. 98% and 4.54%,respectively.The XPS test results show that the combined use of diesel and SDBS is better than that of diesel and SDBS alone.When SDBS as promoter,the content of C—C/C—H groups on the surface of low rank coal increases and the content of oxygen containing functional groups decreases,which indicates that the hydrogen bonding adsorption is the main physical adsorption of SDBS on the surface of low rank coal,the effective implementation of oxygen containing functional groups in low rank coal surface is realized,at the same time,C—C/C—H groups of SDBS expose on the surface of low rank coal enhance the hydrophobicity of low rank coal surface,which helps improve the flotability of low rank coal slime.
引文
[1]陈清如.发展洁净煤技术,推动节能减排[J].中国高校科技,2008(3):65-67.CHEN Qingru.The development of clean coal technology promotes energy conservation[J].China University of Science and Technology,2008(3):65-67.
[2]屈进州.低阶煤活性油泡浮选行为与浮选工艺研究[D].徐州:中国矿业大学,2015.
[3]侯诗宇,马力强,黄根,等.不同密度细粒煤泥对粗粒煤泥浮选的影响机理[J].煤炭学报,2016,41(7):1813-1819.HOU Shiyu,MA Liqiang,HUANG Gen,et al. Mechanism of the effect of fine coal with different densities on coarse coal flotation[J].Journal of China Coal Society,2016,41(7):1813-1819.
[4] GUNKA Volodymyr,PYSHYEV Serhiy. Lignite oxidative desulphurization[J].International Journal of Coal Science&Technology,2014,1(1):62-69.
[5]李甜甜.伊泰低阶煤煤泥浮选试验研究[D].徐州:中国矿业大学,2014.
[6]王永刚,周剑林,林雄超.低阶煤含氧官能团赋存状态及其对表面性质的影响[J].煤炭科学技术,2013,41(9):182-184.WANG Yonggang,ZHOU Jianlin,LIN Xiongchao. Deposit conditions of oxygen functional groups in low rank coal and affected to surface properties[J].Coal Science and Technology,2013,41(9):182-184.
[7]杨阳.低阶煤浮选的试验研究[J].煤炭工程,2013,45(3):105-107.YANG yang.Experiment study on floatation of low rank coal[J].Coal Engineering,2013,45(3):105-107.
[8]王学霞,谢广元,彭耀丽,等.新型浮选药剂改善煤泥分选效果的试验研究[J].中国煤炭,2013,39(8):89-92.WANG Xuexia,XIE Guangyuan,PENG Yaoli,et al. Research on improvement of coal slurry separation effects by new flotation reagents[J].China Coal,2013,39(8):89-92.
[9]吴广玲.氧化煤泥浮选药剂优化与机理研究[D].太原:太原理工大学,2013.
[10]蔡阳辉.煤泥分选特性及药剂优化试验研究[D].太原:太原理工大学,2012.
[11]郭中雅.表面活性剂在褐煤表面吸附特性及其对煤润湿性的影响[D].太原:太原理工大学,2016.
[12]王永田,田全志,张义,等.低阶煤浮选动力学过程研究[J].中国矿业大学学报,2016,45(2):398-404.WANG Yongtian,TIAN Quanzhi,ZHANG Yi,et al. Kinetic process of low-rank coal flotation[J].Journal of China University of Mining,2016,45(2):398-404.
[13]崔广文,于文慧,张玉,等.煤泥浮选药剂研究现状及发展趋势[J].洁净煤技术,2015,21(1):15-19.CUI Guangwen,YU Wenhui,ZHANG Yu,et al.Status and development trend of coal slime flotation reagents[J].Clean Coal Technology,2015,21(1):15-19.
[14]李琳,刘炯天,王运来,等.阴-非离子表面活性剂微乳捕收剂的制备及应用[J].煤炭学报,2014,39(11):2315-2320.LI Lin,LIU Jiongtian,WANG Yunlai,et al.Preparation and application of anionic-nonionic surfactant microemulsified collector[J].Journal of China Coal Society,2014,39(11):2315-2320.
[15]宋贤鹏,樊民强,樊金串.辛基酚聚氧乙烯醚表面活性剂对煤泥浮选的促进作用研究[J].日用化学工业,2015(12):694-696.SONG Xianpeng,FAN Minqiang,FAN Jinchuan. Promotion effect of octylphenyl ethoxylate surfactant series on coal slime flotation[J].Daily Chemical Industry,2015(12):694-696.
[16]赵海洋.大同低阶煤泥浮选试验研究[J].洁净煤技术,2013,19(4):25-28.ZHAO Haiyang.Experimental research on Datong low-rank coal flotation[J].Clean Coal Technology,2013,19(4):25-28.
[17]罗云箫,王永田,田全志,等.低阶煤煤泥浮选试验研究[J].煤炭技术,2016,35(10):300-302.LUO Yunxiao,WANG Yongtian,TIAN Quanzhi,et al. Study on flotation of low-rank coal slime[J]. Coal Technology,2016,35(10):300-302.
[18]马克玉,宋书宇,樊民强.表面活性剂SPAN80对煤泥浮选促进作用的研究[J].选煤技术,2011(3):8-11.MA Keyu,SONG Shuyu,FAN Minqiang. Study on the effect of surfactant SPAN80 on flotation of coal slime[J].Coal Preparation Technology,2011(3):8-11.
[19]崔朋,曹佩.HL-1号表面活性剂作为煤泥浮选促进剂的研究[J].内蒙古煤炭经济,2012(11):76-77.CAO Peng,CAO Pei. Study on the effect of surfactant HL-1 on flotation of coal slime[J]. Inner Mongolia Coal Economy,2012(11):76-77.
[20]杨彦成,陶秀祥,许宁,等.煤炭微波脱硫中硫、碳、氧化学形态变化的XPS分析[J].中国科技论文,2015,10(24):2835-2839.YANG Yancheng,TAO Xiuxiang,XU Ning,et al.XPS analysis of sulfur,carbon and oxygen chemical forms in microwave desulfurization[J].Sciencepaper Online,2015,10(24):2835-2839.
[21]张晨光,王启宝.表面活性剂在煤浮选中的促进作用及机理[J].煤炭加工与综合利用,1996(2):31-33.
[22]董佳伟,栗褒,郭建英,等.Gemini表面活性剂对高灰氧化煤浮选行为影响及机理研究[J].煤炭工程,2017,49(10):149-153.DONG Jiawei,LI Bao,GUO Jianyang,et al. Study on behaviors and mechanism of flotation of high-ash oxidized coal using Gemini surfactant[J].Coal Engineering,2017,49(10):149-153.
[23] ZHANG N,NGUYEN A V,ZHOU C.A review of the surface features and properties,surfactant adsorption and floatability of four key minerals of diasporic bauxite resources[J]. Advances in Colloid and Interface Science,2018,254:56-75.
[2]屈进州.低阶煤活性油泡浮选行为与浮选工艺研究[D].徐州:中国矿业大学,2015.
[3]侯诗宇,马力强,黄根,等.不同密度细粒煤泥对粗粒煤泥浮选的影响机理[J].煤炭学报,2016,41(7):1813-1819.HOU Shiyu,MA Liqiang,HUANG Gen,et al. Mechanism of the effect of fine coal with different densities on coarse coal flotation[J].Journal of China Coal Society,2016,41(7):1813-1819.
[4] GUNKA Volodymyr,PYSHYEV Serhiy. Lignite oxidative desulphurization[J].International Journal of Coal Science&Technology,2014,1(1):62-69.
[5]李甜甜.伊泰低阶煤煤泥浮选试验研究[D].徐州:中国矿业大学,2014.
[6]王永刚,周剑林,林雄超.低阶煤含氧官能团赋存状态及其对表面性质的影响[J].煤炭科学技术,2013,41(9):182-184.WANG Yonggang,ZHOU Jianlin,LIN Xiongchao. Deposit conditions of oxygen functional groups in low rank coal and affected to surface properties[J].Coal Science and Technology,2013,41(9):182-184.
[7]杨阳.低阶煤浮选的试验研究[J].煤炭工程,2013,45(3):105-107.YANG yang.Experiment study on floatation of low rank coal[J].Coal Engineering,2013,45(3):105-107.
[8]王学霞,谢广元,彭耀丽,等.新型浮选药剂改善煤泥分选效果的试验研究[J].中国煤炭,2013,39(8):89-92.WANG Xuexia,XIE Guangyuan,PENG Yaoli,et al. Research on improvement of coal slurry separation effects by new flotation reagents[J].China Coal,2013,39(8):89-92.
[9]吴广玲.氧化煤泥浮选药剂优化与机理研究[D].太原:太原理工大学,2013.
[10]蔡阳辉.煤泥分选特性及药剂优化试验研究[D].太原:太原理工大学,2012.
[11]郭中雅.表面活性剂在褐煤表面吸附特性及其对煤润湿性的影响[D].太原:太原理工大学,2016.
[12]王永田,田全志,张义,等.低阶煤浮选动力学过程研究[J].中国矿业大学学报,2016,45(2):398-404.WANG Yongtian,TIAN Quanzhi,ZHANG Yi,et al. Kinetic process of low-rank coal flotation[J].Journal of China University of Mining,2016,45(2):398-404.
[13]崔广文,于文慧,张玉,等.煤泥浮选药剂研究现状及发展趋势[J].洁净煤技术,2015,21(1):15-19.CUI Guangwen,YU Wenhui,ZHANG Yu,et al.Status and development trend of coal slime flotation reagents[J].Clean Coal Technology,2015,21(1):15-19.
[14]李琳,刘炯天,王运来,等.阴-非离子表面活性剂微乳捕收剂的制备及应用[J].煤炭学报,2014,39(11):2315-2320.LI Lin,LIU Jiongtian,WANG Yunlai,et al.Preparation and application of anionic-nonionic surfactant microemulsified collector[J].Journal of China Coal Society,2014,39(11):2315-2320.
[15]宋贤鹏,樊民强,樊金串.辛基酚聚氧乙烯醚表面活性剂对煤泥浮选的促进作用研究[J].日用化学工业,2015(12):694-696.SONG Xianpeng,FAN Minqiang,FAN Jinchuan. Promotion effect of octylphenyl ethoxylate surfactant series on coal slime flotation[J].Daily Chemical Industry,2015(12):694-696.
[16]赵海洋.大同低阶煤泥浮选试验研究[J].洁净煤技术,2013,19(4):25-28.ZHAO Haiyang.Experimental research on Datong low-rank coal flotation[J].Clean Coal Technology,2013,19(4):25-28.
[17]罗云箫,王永田,田全志,等.低阶煤煤泥浮选试验研究[J].煤炭技术,2016,35(10):300-302.LUO Yunxiao,WANG Yongtian,TIAN Quanzhi,et al. Study on flotation of low-rank coal slime[J]. Coal Technology,2016,35(10):300-302.
[18]马克玉,宋书宇,樊民强.表面活性剂SPAN80对煤泥浮选促进作用的研究[J].选煤技术,2011(3):8-11.MA Keyu,SONG Shuyu,FAN Minqiang. Study on the effect of surfactant SPAN80 on flotation of coal slime[J].Coal Preparation Technology,2011(3):8-11.
[19]崔朋,曹佩.HL-1号表面活性剂作为煤泥浮选促进剂的研究[J].内蒙古煤炭经济,2012(11):76-77.CAO Peng,CAO Pei. Study on the effect of surfactant HL-1 on flotation of coal slime[J]. Inner Mongolia Coal Economy,2012(11):76-77.
[20]杨彦成,陶秀祥,许宁,等.煤炭微波脱硫中硫、碳、氧化学形态变化的XPS分析[J].中国科技论文,2015,10(24):2835-2839.YANG Yancheng,TAO Xiuxiang,XU Ning,et al.XPS analysis of sulfur,carbon and oxygen chemical forms in microwave desulfurization[J].Sciencepaper Online,2015,10(24):2835-2839.
[21]张晨光,王启宝.表面活性剂在煤浮选中的促进作用及机理[J].煤炭加工与综合利用,1996(2):31-33.
[22]董佳伟,栗褒,郭建英,等.Gemini表面活性剂对高灰氧化煤浮选行为影响及机理研究[J].煤炭工程,2017,49(10):149-153.DONG Jiawei,LI Bao,GUO Jianyang,et al. Study on behaviors and mechanism of flotation of high-ash oxidized coal using Gemini surfactant[J].Coal Engineering,2017,49(10):149-153.
[23] ZHANG N,NGUYEN A V,ZHOU C.A review of the surface features and properties,surfactant adsorption and floatability of four key minerals of diasporic bauxite resources[J]. Advances in Colloid and Interface Science,2018,254:56-75.