煤气化渣制备聚合氯化铝工艺研究
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摘要
我国煤气化渣(CGR)年产量巨大,但综合利用率低,现有堆存与填埋方式具有较大的环境风险与经济压力,规模化消纳与资源化利用需求迫切。以煤气化渣酸浸液制备聚合氯化铝絮凝剂为目标,考察了铝酸钙粉用量、聚合温度、聚合时间和酸洗液循环次数对聚合氯化铝产品指标的影响。结果表明,煤气化渣酸洗液循环次数达到4次时,液相中铝离子浓度为28 g/L,氧化铝含量可达5. 28%;以该富铝酸液为反应原料,反应温度80℃、反应时间120 min、铝酸钙粉用量12. 50 g/50 m L时,得到的聚合氯化铝产品中氧化铝质量分数为10%～11%,盐基度为44%～50%,且产品中铅、铬、砷等重金属元素含量极低,各项性能指标均符合GB/T 22627—2014中水处理剂聚合氯化铝的制备标准。
In china,the production of coal gasification residue( CGR) is huge while comprehensive utilization is very low.Storage and landfill are main ways to dispose CGR,which has been a threat to environment and throws burdens onto economy.The demand of large-scale treatment and resource conversion of CGR is urgent.The purpose of this paper is to use leach acid of CGR to produce polyaluminium chloride.The influence of calcium aluminate dosage,polymerization temperature,polymerization time and cycle number of acid leaching on the performance of production were highly investigated.Results suggest that,the concentration of Al~(3+)in the acid leach solution can reach 28 g/L and the content of aluminum oxide can be 5.28% when cycle number of acid leaching reaches 4.Using aluminum-rich acid solution as raw material to product polyaluminium-chloride,the optimal polymerization conditions are reaction temperature 80 ℃,reaction time 120 min,and 12.50 g calcium aluminate powder per 50 m L the leach acid solution.Under these conditions,as-prepared polyaluminium-chloride contains 10%-11% Al2 O_3 with basicity of 44%-50% and the content of heavy metal,such as Pb,Cr,As,is very low.The final product can reach the requirement of GB/T 22627—2014 for the preparation of water treatment agent.
In china,the production of coal gasification residue( CGR) is huge while comprehensive utilization is very low.Storage and landfill are main ways to dispose CGR,which has been a threat to environment and throws burdens onto economy.The demand of large-scale treatment and resource conversion of CGR is urgent.The purpose of this paper is to use leach acid of CGR to produce polyaluminium chloride.The influence of calcium aluminate dosage,polymerization temperature,polymerization time and cycle number of acid leaching on the performance of production were highly investigated.Results suggest that,the concentration of Al~(3+)in the acid leach solution can reach 28 g/L and the content of aluminum oxide can be 5.28% when cycle number of acid leaching reaches 4.Using aluminum-rich acid solution as raw material to product polyaluminium-chloride,the optimal polymerization conditions are reaction temperature 80 ℃,reaction time 120 min,and 12.50 g calcium aluminate powder per 50 m L the leach acid solution.Under these conditions,as-prepared polyaluminium-chloride contains 10%-11% Al2 O_3 with basicity of 44%-50% and the content of heavy metal,such as Pb,Cr,As,is very low.The final product can reach the requirement of GB/T 22627—2014 for the preparation of water treatment agent.
引文
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[14]杜冬云,李娜,林冲.利用粉煤灰和酸性含铝废水制备聚合氯化铝[J].中南民族大学学报(自然科学版),2011,30(2):10-13.DU Dongyun,LI Na,LIN Chong. Preparation of polyalumini-um chloride(PAC)from fly ash and acidic wastewater containingaluminum[J]. Journal of South-Central University for Nationali-ties(Natural Science Edition),2011,30(2):10-13.
[15]王锐刚,王亮梅.煤矸石制备聚合氯化铝及其废水处理研究[J].水处理技术,2013,39(3):48-50.WANG Ruigang,WANG Liangmei. Preparation of polymeric alu-minum chloride from coal ganue and its application on waste watertreatment[J].Water Treatment Technology,2013,39(3):48-50.
[16]张桂珍,用铝灰制备聚合氯化铝工艺研究[J].天津化工,1998,2(1):21-24.
[2]李贺.中国煤间接液化技术及未来前景概述[J].内蒙古石油化工,2014,7(8):97-154.
[3]商晓甫,游洋洋,周金倩,等.煤气化渣利用技术研究现状及应用趋势浅析[C]//2016中国环境科学学会学术年会论文集.海口:中国环境科学学会,2016:823-826.
[4] POMYKALA R.The mechanical properties of coal gasification slagas a component of concrete and binding mixtures[J].Polish Journalof Environmental Studies,2014,23(4):1403-1406.
[5] WONGKEO W,CHAIPANICH A. Compressive strength,micro-structure and thermal analysis of autoclaved and air cured struc-tural lightweight concrete made with coal bottom ash and silicafume[J]. Materials Science&Engineering A,2010,527(16):3676-3684.
[6] POMYKALA R.The mechanical properties of coal gasification slagas a component of concrete and binding mixtures[J].Polish Journalof Environmental Studies,2014,23(4):1403-1406.
[7]周梦福.近年来聚合氯化铝生产工艺的新发展[J].化工管理,2017(16):196.
[8]李玉芳.聚合氯化铝的生产技术及应用进展[J].化工文摘,2009(2):25-27.
[9]郑怀礼,高亚丽,蔡璐微,等.聚合氯化铝混凝剂研究与发展状况[J].无机盐工业,2015,47(2):1-5.ZHENG Huaili,GAO Yali,CAI Luwei,et al.Research and develop-ment status of poly aluminum chloride coagulant[J]. InorganicChemicals Industry,2015,47(2):1-5.
[10]李会泉,张建波,王晨晔,等.高铝粉煤灰伴生资源清洁循环利用技术的构建与研究进展[J].洁净煤技术,2018,24(2):1-8.LI Huiquan,ZHANG Jianbo,WANG Chenye,et al. Construct andresearch advance in clean and cyclic utilizations of associated re-sources in high-alumina coal fly ash[J].Clean Coal Technology,2018,24(2):1-8.
[11]焦洪军.粉煤灰制备聚氯化铝(PAC)的研究[D].兰州:兰州理工大学,2008.
[12]王丽华.利用高铝粉煤灰制备聚合氯化铝的实验研究[D].北京:中国地质大学,2006.
[13]张建波.高铝粉煤灰协同活化制备莫来石工艺基础研究[D].北京:中国科学院大学(中国科学院过程工程研究所),2017.
[14]杜冬云,李娜,林冲.利用粉煤灰和酸性含铝废水制备聚合氯化铝[J].中南民族大学学报(自然科学版),2011,30(2):10-13.DU Dongyun,LI Na,LIN Chong. Preparation of polyalumini-um chloride(PAC)from fly ash and acidic wastewater containingaluminum[J]. Journal of South-Central University for Nationali-ties(Natural Science Edition),2011,30(2):10-13.
[15]王锐刚,王亮梅.煤矸石制备聚合氯化铝及其废水处理研究[J].水处理技术,2013,39(3):48-50.WANG Ruigang,WANG Liangmei. Preparation of polymeric alu-minum chloride from coal ganue and its application on waste watertreatment[J].Water Treatment Technology,2013,39(3):48-50.
[16]张桂珍,用铝灰制备聚合氯化铝工艺研究[J].天津化工,1998,2(1):21-24.