The Investigation on Extraction Characteristic Experiment of Fly Ash
The paper studied the extraction characteristics of the fly ash from a location in Guizhou province.Under ordinary pressure,the fly ash is extracted by an acid and alkali,and then studied for its reaction characteristics with different extraction agentia,temperature,consistence and time.The results of acid extraction show that there are good reaction characteristics for Fe2O3 with HCl and the extraction rate decreases with the increasing of extraction time.There are good selective characteristics between Al2O3 and H2SO4 and they weaken with the increasing of temperature and the expanding of time.The best extraction results are shown with CaO and MgO because of their chemical characteristics and the over-saturation degree of the extraction processing.In addition,Its found that it cannot leach all the substances from fly ash even with the higher consistence (10mol/L) of extraction agent,the longer extraction time (2h) and the higher temperature (100℃) .It shows that the extraction rate of Fe2O3 is 82.81% and that of Al2O3 is 29.01%.The results of alkali extraction show that the extraction rate increases with the consistence of extraction agent and temperature,and the extraction rate of SiO2 by NaOH increases rapidly with the time expanding while that of Al2O3 falls gradually.
Fly ash Extraction experiment Reaction characteristic
Y.Tang A.R.Liu Q.Zhang F.L.Chen
Guizhou University Mining Institute,China. Chengdu Comprehensive Rock and Ore Test Centre,China
国际会议
XXIV International Mineral Processing Congress(第24届国际矿物加工大会)
北京
英文
3657-3662
2008-09-24（万方平台首次上网日期，不代表论文的发表时间）