摘要
采用诱导结晶法软化煤制甲醇气化灰水,研究了不同诱导晶种(石榴石、方解石、石英砂等)及其加入量(2.5、4.0、5.0、6.0、7.5 g/L)、pH、药剂NaAlO_(2)、搅拌速度(100、200、300、400、500 r/min)对煤制甲醇气化灰水软化效果的影响。结果表明,使用石榴石作为诱导晶种,在pH 11、石榴石和NaAlO_(2)投加量为6.0 g/L和0.1 g/L、搅拌速度300 r/min、结晶时间1 h下,总硬度由670 mg/L降至19 mg/L,去除率达到97.16%,全硅(以SiO_(2)计)由180 mg/L降至24 mg/L,去除率达到86.67%。通过SEM-EDS表征发现,石榴石表面负载了CaCO_(3)、Mg(OH)_(2)及硅铝酸盐结晶,证实通过提供异相成核位点,有效实现了对煤气化灰水中钙镁离子、硅的去除。
The induced crystallization method was employed to soften coal-to-methanol gasification scrubber wastewater.This study investigated the effects of different seed crystals(garnet,calcite,quartz sand),their dosages(2.5,4.0,5.0,6.0,7.5 g/L),pH,NaAlO_(2),and stirring speed(100,200,300,400,500 r/min)on softening efficiency.The results showed that when garnet as seed crystal under optimal conditions(pH 11,garnet dosage 6 g/L,NaAlO_(2)0.1 g/L,stirring speed 300 r/min,and crystallization time 1 h),the total hardness decreased from 670 mg/L to 19 mg/L(97.16%removal),and the total silicon(as SiO_(2))decreased from 180 mg/L to 24 mg/L(86.67%removal).SEM-EDS analysis confirmed the deposition of CaCO_(3),Mg(OH)_(2),and silicate aluminosilicate crystals on garnet surface,demonstrating its effectiveness in removing calcium,magnesium ions,and silicon through provising heterogeneous nucleation sites.
作者
任烽瑜
张新妙
章晨林
赵冲
栾金义
REN Fengyu;ZHANG Xinmiao;ZHANG Chenlin;ZHAO Chong;LUAN Jinyi(Environmental Protection Research Institute,Sinopec(Beijing)Research Institute of Chemical Industry Co.,Ltd.,Beijing 100013,China)
出处
《工业水处理》
北大核心
2025年第7期183-188,共6页
Industrial Water Treatment
关键词
诱导结晶
硬度
石榴石
软化
气化灰水
induced crystallization
hardness
garnet
soften
gasification scrubber wastewater
