化学混凝去除煤气化灰水结垢离子研究
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摘要
通过混凝实验对典型煤气化灰水Ca~(2+)、Mg~(2+)、SiO_2的去除情况进行研究,探讨了煤气化灰水结垢离子的去除方法。结果表明,氢氧化钠和碳酸钠双碱组合是煤气化灰水除硬理想的药剂组合,石灰法基本没有碱度去除能力,同时,高pH有利于硅的脱除。铁系混凝剂经混凝沉淀后Fe~(3+)残余质量浓度在0.1 mg/L以下,可满足后续回用水单元的接水要求。
The research on the removal of scaling ions,including Ca~(2+),Mg~(2+)and SiO_2,from typical coal gasification ash water has been accomplished through coagulation experiments,and the method of removing scaling ions from gasification ash water discussed. The results show that the double-alkali combination of sodium hydroxide and sodium carbonate is an ideal chemical combination for removing the hardness from coal gasification ash water. It is known that lime method does not have alkalinity removing capability basically. In addition,high pH is advantageous to the removal of silica. After the ferric coagulants have been coagulated and precipitated,the mass concentration of the residues is below 0.1 mg/L,meeting the water receiving requirements for subsequent water reuse unit.
The research on the removal of scaling ions,including Ca~(2+),Mg~(2+)and SiO_2,from typical coal gasification ash water has been accomplished through coagulation experiments,and the method of removing scaling ions from gasification ash water discussed. The results show that the double-alkali combination of sodium hydroxide and sodium carbonate is an ideal chemical combination for removing the hardness from coal gasification ash water. It is known that lime method does not have alkalinity removing capability basically. In addition,high pH is advantageous to the removal of silica. After the ferric coagulants have been coagulated and precipitated,the mass concentration of the residues is below 0.1 mg/L,meeting the water receiving requirements for subsequent water reuse unit.
引文
[1]王孝峰,蔡恩明.我国煤化工产业现状及发展趋势解析[J].中国石油和化工经济分析,2011(12):20-24.
[2]李智,张玉先. Na OH软化-电絮凝处理炼油厂RO外排浓水研究[J].给水排水,2009. 328(11):189-192.
[3]田磊,齐永红,杨楠.化学混凝去除反渗透浓水结垢离子研究[J].工业水处理,2014,34(2):43-46.
[4]张桐,仝胜录,王晓雷,等.电渗析技术对煤气化灰水的处理[J].环境工程,2016,34(S1):278-281.
[5]张永胜,崔恒玲.煤制烯烃气化废水中硬度的处理研究[J].内蒙古石油化工,2015,41(14):7-8.
[6]万大军.石灰纯碱软化-絮凝法处理水煤浆气化污水的应用[J].化工生产与技术,2015,22(3):47-49.
[7]万大军.高密度沉淀池处理气化污水结垢应用研究[J].神华科技,2016,14(3):90-93.
[8]崔喜春.添加镁离子对碳酸钙结晶形貌的影响[J].桂林工学院学报,2005(2):208-210.
[9]张博,范代娣,屈撑囤,等.镁剂除硅剂在稠油污水处理过程中的应用[J].石油化工应用,2015,34(8):87-91.
[2]李智,张玉先. Na OH软化-电絮凝处理炼油厂RO外排浓水研究[J].给水排水,2009. 328(11):189-192.
[3]田磊,齐永红,杨楠.化学混凝去除反渗透浓水结垢离子研究[J].工业水处理,2014,34(2):43-46.
[4]张桐,仝胜录,王晓雷,等.电渗析技术对煤气化灰水的处理[J].环境工程,2016,34(S1):278-281.
[5]张永胜,崔恒玲.煤制烯烃气化废水中硬度的处理研究[J].内蒙古石油化工,2015,41(14):7-8.
[6]万大军.石灰纯碱软化-絮凝法处理水煤浆气化污水的应用[J].化工生产与技术,2015,22(3):47-49.
[7]万大军.高密度沉淀池处理气化污水结垢应用研究[J].神华科技,2016,14(3):90-93.
[8]崔喜春.添加镁离子对碳酸钙结晶形貌的影响[J].桂林工学院学报,2005(2):208-210.
[9]张博,范代娣,屈撑囤,等.镁剂除硅剂在稠油污水处理过程中的应用[J].石油化工应用,2015,34(8):87-91.