Inorganic Chemicals Industry >
Study on alkali leaching process of aluminum extraction residue from fly ash at low temperature
Received date: 2019-02-10
Online published: 2020-06-15
Mainly composed by amorphous silica and having higher activity,the residue from circulating fluidized bed ash detached Al2O3 with one-step acid dissolution method is ideal raw materials for preparation of silica,molecular sieve and Na2SiO3.The dissolving process of residue of fly ash in sodium hydroxide solution was studied.The influence of liquid-solid ratio,alkali concentrations,dissolving time and dissolving temperature on dissolution rate of SiO2 and Al2O3 was also discussed.The results showed that the dissolving ratio of silica in residue of fly ash could be more than 93%,when the concentration of sodium hydroxide was 4 mol/L,the reactive temperature was 70 ℃,the liquid-solid ratio was 6,and the reactive time was 4 h.The solid residue from alkali leaching process of aluminum extraction residue was analysized by XRD.Results showed that almost all of amorphous silica in the residue dissolved into the lye,and the alkali residue was comprised of anatase,mullite and so on.
Yanxia Du , Zhaohua Guo , Yongwang Wang , Dong Chen . Study on alkali leaching process of aluminum extraction residue from fly ash at low temperature[J]. Inorganic Chemicals Industry, 2019 , 51(8) : 69 -72 . DOI: 10.11962/1006-4990.2018-0519
| [1] | Blisserr R S, Rowson N A . A review of the multi-component utilization of coal fly ash[J]. Fuel, 2012,97:1-23. |
| [2] | 刘晓婷, 王宝冬, 肖永丰 , 等. 高铝粉煤灰碱溶预脱硅过程研究[J]. 中国粉体技术, 2013,19(6):24-27. |
| [3] | Matjie R H, Bunt J R, van Heerden J H P , et al. Extraction of alumina from coal fly ash generated from a selected low rank bituminous South African coal[J]. Minerals Engineering, 2005,18:299-310. |
| [4] | 李来时, 翟玉春, 秦晋国 , 等. 以粉煤灰为原料制备高纯氧化铝[J]. 化工学报, 2006,57(9):2189-2193. |
| [5] | 曹君, 方莹, 范仁东 , 等. 粉煤灰提取氧化铝联产二氧化硅的研究进展[J]. 无机盐工业, 2015,47(8):10-13. |
| [6] | 徐涛, 蓝海平, 杨超 , 等. 粉磨酸浸-氯化氢通气结晶法提取粉煤灰中氧化铝[J]. 无机盐工业, 2018,50(1):57-61. |
| [7] | 曾丹林, 张琦, 刘胜兰 , 等. 粉煤灰中有价元素的回收利用研究[J]. 安徽农业科学, 2013,41(36):14006-14008. |
| [8] | Bengtson K B , A technological comparison of six processes for the production of reduction-grade alumina from non-bauxite raw materials[J]. Light Met., 1979, 217-282. |
| [9] | Livingston W R, Rogers D A, Chapman R J , et al. The effect of the calcination conditions on the leaching properties of the colliery spoil[J]. Hydrometallurgy, 1982,10:97-109. |
| [10] | 王恩 . 煤粉炉粉煤灰与循环流化床粉煤灰矿物学性质比较[J]. 洁净煤技术, 2016(4):26-29. |
| [11] | 郭昭华 . 粉煤灰“一步酸溶法”提取氧化铝工艺技术及工业化发展研究[J]. 煤炭工程, 2015,47(7):5-8. |
| [12] | 李军旗, 浦锐, 陈朝轶 , 等. 碱法对粉煤灰的预脱硅处理[J]. 轻金属, 2010,11(8):11-13. |
/
| 〈 |
|
〉 |