摘要
为改善含氨粉煤灰对充填膏体性能带来的不利影响,提高粉煤灰的利用率,实验采用空气吹脱粉煤灰浆液的方式进行脱氨,探究吹脱时间、气浆比、固液比、温度和加碱量等影响因素对粉煤灰脱氨率的影响.结果表明,通过响应面优化吹脱条件,控制吹脱时间1h、气浆比900、固液比0.219、温度26.785℃和加碱量1.802%,预测总脱氨率最高达97.178%,与实际误差率在2%以内.经优化吹脱后所制备的粉煤灰充填膏体,仅在养护前期有少量的氨气释放,其泵送性能和微观结构相较于原含氨粉煤灰膏体都得到改善,且在养护28d后,抗压强度提升高达57%.
In order to improve the adverse effects of ammonia-containing fly ash on the performance of filling paste and improve the utilization rate of fly ash,the air stripping of fly ash slurry was used to remove ammonia in the experiment.The effects of stripping time,air-slurry ratio,solid-liquid ratio,temperature and alkali addition on the ammonia removal rate of fly ash were investigated.The results showed that the stripping conditions were optimized by response surface methodology,and the stripping time was 1h,the gas-slurry ratio was 900,the solid-liquid ratio was 0.219,the temperature was 26.785℃ and the alkali dosage was 1.802%.The predicted total ammonia removal rate was up to 97.178%,and the actual error rate was within 2%.The fly ash filling paste prepared after optimized stripping has only a small amount of ammonia release in the early stage of curing,and its pumping performance and microstructure are improved compared with the original ammonia-containing fly ash paste.After 28days of curing,the compressive strength is increased by up to 57%.
作者
李亚娇
李泓成
王铁
鞠恺
金鹏康
唐仁龙
邵小平
赵兵朝
任武昂
LI Ya-jiao;LI Hong-cheng;WANG Tie;JU Kai;JIN Peng-kang;TANG Ren-long;SHAO Xiao-ping;ZHAO Bing-chao;REN Wu-ang(College of Architecture and Civil Engineering,Xi'an University of Science and Technology,Xi'an 710054,China;Shaanxi Binchang Mining Group Co.LTD,Xianyang 712000,China;Xi'an Jiaotong University School of Human Settlements Environment,Xi'an 710040,China;College of Energy Engineering,Xi'an University of Science and Technology,Xi'an 710054,China)
出处
《中国环境科学》
EI
CAS
CSCD
北大核心
2024年第3期1386-1396,共11页
China Environmental Science
基金
国家自然科学基金资助项目(52074208)。
关键词
粉煤灰
氨吹脱
脱氨率
充填膏体
膏体特性
fly ash
ammonia stripping
deamination rate
filling paste
paste characteristics
