摘要
煤矸石是主要的煤系固废,其中氧化铝的含量占到25%左右,又是一种可以利用的资源。本实验以山西潞安煤矿的煤矸石为原料,采用正交试验的方法,研究了盐酸作为酸浸介质浸取煤矸石中氧化铝。主要影响因素为煅烧温度、酸量、固液比及酸浸时间,最佳工艺条件为:煅烧温度为650℃,酸量为225mL(按照煤矸石中氧化铝和盐酸反应的摩尔比为1∶6计)、固液比为1∶3、酸浸时间为3 h,单因素重复试验结果和正交实验的结果相符,在最佳条件下,氧化铝的溶出实验验证结果表明,三氧化二铝溶出率为71.49%。本研究对实现煤矸石的资源化综合利用具有重要的意义。
Coal gangue, which contains about 25% of Al2O3 , is a main solid waste of coal industry, but it is also a useful resource. Orthogonal experiment was used to find the the optimum technical condition of acid lixiviating Al2O3 from coal gangue, which was taken from Lu＇an Coal Mining Company, Shanxi Province. The experimental results show that： the optimum technical conditions are that calcine temperature is 650℃ , quantity of 20% hydrochloric acid is 225 mL（ about six times by mol of Al2O3 contained in coal gangue） per 100 grams coal gangue, ratio of solid to liquid is 1 ： 3, and reaction time is 3 hours. Result of single-factor affecting experiment is in accord with orthogonal experiment. Aluminum leaching rate is 71.49% under the optimum conditions. This study has great significance on utilization of coal gangue resources of Shanxi Province.
出处
《环境工程学报》
CAS
CSCD
北大核心
2007年第11期99-103,共5页
Chinese Journal of Environmental Engineering
基金
国家科技支撑项目资助(2007BAB24B01)
山西潞安环能"2005潞安技字025"资助项目
关键词
煤矸石
氧化铝
正交实验
溶出率
coal gangue
aluminum oxide
orthogonal experiment
leaching rate
