摘要
开展了煤矸石和赤泥协同提取氧化铝研究,考察了添加赤泥对煤矸石活化提取氧化铝及对助剂碳酸钠消耗量的影响,并利用TG-DSC和XRD研究了赤泥添加对煤矸石活化过程的影响。结果表明,"煤矸石-赤泥-Na_2CO_3"混合样中氧化铝的溶出率随Na/Al摩尔比和煅烧温度的增加而增加,在Al/Si摩尔比为1的条件下,当Na/Al摩尔比为1.2、煅烧温度为850℃时,混合样的氧化铝溶出率可达到91.7%,与碳酸钠直接活化煤矸石相比,碳酸钠消耗量可降低77.9%。TG-DSC和XRD的结果表明,煤矸石、赤泥以及碳酸钠在低于700℃时相互作用比较弱,在高于800℃时三者发生相互作用,赤泥的加入由于调整了样品中的Al/Si摩尔比,使反应的最终物相选择性地向Na∶Al∶Si摩尔比为1∶1∶1的霞石和沸石相转化。
Combined extraction of alumina from coal gangue and red mud was studied.The effect of red mud on the alumina extraction of coal gangue and the consumption of Na2CO3 was investigated.The effect of the red mud on the activation process of coal gangue by Na2CO3 calcination was studied by way of TG-DSC and XRD.The results showed that the dissolution of alumina for the mixed“coal gangue-red mud-Na2CO3”sample increased with the Na/Al molar ratio and the calcination temperature.The alumina dissolution of the mixed sample reached 91.7%when the Na/Al molar ratio was 1.2 and the calcination temperature was 850℃at the Al/Si molar ratio of 1.The consumption of Na2CO3 decreased 77.9%at this condition by comparison with that of coal gangue activated directly by Na2CO3.The results of TG-DSC and XRD showed that the interactions among coal gangue,red mud and Na2CO3 were weak at<700℃and were strengthened at>800℃.The addition of red mud would make the phases in the mixed sample selectively transformed into nepheline and zeolite with a Na∶Al∶Si molar ratio of 1∶1∶1 owing to the adjustment of the Al/Si molar ratio of the sample.
作者
郭玉梅
曹丽琼
郭彦霞
燕可洲
GUO Yumei;CAO Liqiong;GUO Yanxia;YAN Kezhou(Collaborative Innovation Center of High Value-added Utilization of Coal-related Wastes,Institute of Resources and Environmental Engineering,Shanxi University,Taiyuan 030006,Shanxi,China;Shanxi Vocational and Technical College of Coal,Taiyuan 030001,Shanxi,China)
出处
《化工学报》
EI
CAS
CSCD
北大核心
2019年第4期1542-1549,共8页
CIESC Journal
基金
山西省煤基低碳科技重大专项(MC2016-05)
国家重点研发计划项目(2017YFB0603101)
山西省高等学校中青年拔尖创新人才支持计划
关键词
煤矸石
赤泥
氧化铝
活化
废物处理
矿相转变
coal gangue
red mud
alumina
activation
waste treatment
mineral transformation
