摘要
利用硼砂的助熔作用以及B对Si的取代特性,将硼砂与粉煤灰(CFA)混合并在高温下烧结,烧结熟料用硫酸溶液浸取,从而实现粉煤灰铝质组分提取。结果显示w(Na2B4O7)∶w(CFA)=0.5时,900℃烧结5minCFA中氧化铝浸出率超过95%,烧结1h,浸出率大于99%,继续升高烧结温度或延长烧结时间,则浸出率下降。借鉴现有硫酸法制硼酸工艺可以同时实现粉煤灰提铝与硼酸制备。
In order to extract aluminum from coal fly ash （CFA） borax was added due to its fluxing action and the sub- stitution of boron for Si. The mixture was sintered at high temperature and then leached using sulfuric acid solution. The results showed that more than 95% of aluminum in CFA was extracted from the mixture （w（Na2 B4 O7 ） ： w（CFA） =0. 5） sintered at 900 ℃ for 5 minutes and more than 99% of aluminum was from one hour-sintered mixture. The amount of aluminum extraction decreased when the sintering temperature was higher than 900 ℃ and the sintering time was longer than 1 h. The extraction of aluminum from CFA and the preparation of boric acid are possible to be achieved simultaneously based on present sulfuric acid-borate process.
出处
《武汉理工大学学报》
CAS
CSCD
北大核心
2013年第8期120-123,共4页
Journal of Wuhan University of Technology
基金
上海市教育委员会科研创新项目(11CXY25)
国家自然科学基金面上项目(21176082)
博士点基金(20110074110002)
教育部创新基金(ECUST)
关键词
粉煤灰
铝
硼砂
硫酸
硼酸
coal fly ash
aluminum
borax
sulfuric acid
boric acid
