Extraction and separation of Fe3+ and Al3+ from sulfuric acid leaching solution of high-iron coal fly ash by P204
ZHAO Ai-chun1, HE Xin1, ZHANG Ting-an2, LIU Yu-jin1, YE Xin1, ZENG Miao3
1. School of Materials Science and Engineering, Taiyuan University of Science and Technology, Taiyuan 030024, Shanxi, China; 2. Key Laboratory for Ecological Metallurgy of Multimetallic Mineral (Ministry of Education), Northeastern University, Shenyang 110819, Liaoning, China; 3. Liaoning Province Liaoyang Ecology and Environment Monitoring Center, Liaoyang 111018, Liaoning, China
Abstract：As the main solid waste produced by coal-fired power plants, fly ash has a huge annual output and storage. In recent years, more and more scholars began to pay attention to how to effectively recycle fly ash. Acid leaching method is one of the main ways to extract valuable elements from fly ash. Due to the similar chemical properties of Fe3+ and Al3+, it is difficult to separate from each other, which has become the main factor restricting the resource treatment of high-iron fly ash. The separation of iron and aluminum from high-iron fly ash acid leaching solution (containing 14.644 g/L Fe3+ and 12.944 g/L Al3+) was studied by using P204 as extraction agent and 260# solvent oil as diluent. The results showed that when the volume fraction of P204 was 40%, the temperature was 60 ℃, the time was 20 min, the ratio of V(O): V(A) was 1:1, and the initial pH of the solution was 1.2, the extraction rate of Fe3+ was 92.2%, the extraction rate of Al3+ was less than 1%, and the good separation effect of iron and aluminum was achieved. The results of FT-IR detection showed that Fe3+ was extracted into the organic phase by combining with P-O-H and P=O bonds in the extraction process. The raffinate was evaporated and crystallized, and the production was determined as Al2(SO4)3 product by XRD.
赵爱春, 贺欣, 张廷安, 刘煜金, 叶鑫, 曾淼. P204萃取分离高铁粉煤灰硫酸浸液中铁铝[J]. 中国冶金, 2022, 32(4): 126-131.
ZHAO Ai-chun, HE Xin, ZHANG Ting-an, LIU Yu-jin, YE Xin, ZENG Miao. Extraction and separation of Fe3+ and Al3+ from sulfuric acid leaching solution of high-iron coal fly ash by P204[J]. China Metallurgy, 2022, 32(4): 126-131.
SU H F,TAN F R,LIN J F. An integrated approach combines hydrothermal chemical and biological treatment to enhance recycle of rare metals from coal fly ash[J]. Chemical Engineering Journal,2020,395:1.
[2]
WANG X X,ZHU K Y,ZHANG L,et al. Preparation of high-quality glass-ceramics entirely derived from fly ash of municipal solid waste incineration and coal enhanced with pressure pretreatment[J]. Journal of Cleaner Production,2021,324:1.
[3]
Khavharendwe M Rambau,Nicholas M Musyoka,Rafal Panek,et al. Preparation of coal fly ash derived metal organic frameworks and their carbon derivatives[J]. Materials Today Communications,2021,27:1.
[4]
Halada K,Shimada M,Ijima K. Forecasting of the consumption of metals up to 2050[J]. Materials Transactions,2008,49(3):831.
[5]
Shemi A,Ndlovu S,Siban Da V,et al. Extraction of alumina from coal fly ash using an acid leach-sinter-acid leach technique[J]. Hydrometallurgy,2015,157:348.
[6]
WU C Y,YU H F,ZHANG H F. Extraction of aluminum by pressure acid-leaching method from coal fly ash[J]. Transactions of Nonferrous Metals Society of China,2012,22(9):2282.
Nayak N,Panda C R. Aluminium extraction and leaching characteristics of Talcher Thermal Power Station fly ash with sulphuric acid[J]. Fuel,2010,89:53.
[15]
HU P,ZHANG Y,LIU T,et al. Separation and recovery of iron impurity from a vanadium-bearing stone coal via an oxalic acid leaching-reduction precipitation process[J]. Separation and Purification Technology,2017,180:99.
[16]
Aydin F A,Soylak M. Separation preconcentration and inductively coupled plasma-mass spectrometric (ICP-MS) determination of thorium (Ⅳ),titanium (Ⅳ),iron (Ⅲ),lead (Ⅱ) and chromium (Ⅲ) on 2-nitroso-1-naphthol impregnated MCI GEL CHP20P resin[J]. Journal of Hazardous Materials,2010,173:669.
[17]
Soylak M,Yilmaz E. Sorbent extraction of 4-(2-thiazolylazo) resorcinol (TAR)-metal chelates on Diaion SP-850 adsorption resin in order to preconcentration/separation[J]. Journal of Hazardous Materials,2010,182:704.
[18]
CHOU K S,LIN C C. Extracting iron from aluminum sulfate solution[J]. Hydrometallurgy,1986,15(3):391.
[19]
SUN X,SUN Y,YU J. Removal of ferric ions from aluminum solutions by solvent extraction,part I:Iron removal[J]. Separation and Purification Technology,2016,159:18.
[20]
WEI Q F,REN X L,GUO J J,et al. Recovery and separation of sulfuric acid and iron from dilute acidic sulfate effluent and waste sulfuric acid by solvent extraction and stripping[J]. Journal of Hazardous Material,2016,304:1.
[21]
WANG L,WANG Y,CUI L,et al. A sustainable approach for advanced removal of iron from CFA sulfuric acid leach liquor by solvent extraction with P507[J]. Separation and Purification Technology,2020,251:1.
JIN Y,MA Y,WENG Y,et al. Solvent extraction of Fe3+ from the hydrochloric acid route phosphoric acid by D2EHPA in kerosene[J]. Journal of Industrial and Engineering Chemistry,2014,20(5):3446.
2022, Vol. 32 
