Removal Behavior of Carbonate in Bauxite Digestion Process

doi:10.12068/j.issn.1005-3026.2022.01.005

Abstract

Abstract: The changing rule and removal mechanism of carbonate from sodium aluminate solution with lime addition， digestion temperature， seed addition and carbonate concentration were systematically investigated by XRD， XRF， SEM-EDS and PSD methods. The results show that when the mass concentration of carbonate in sodium aluminate solution is 25g·L^-1， the optimum digestion conditions of alumina and removal conditions of carbonate were lime addition of 11% and reaction temperature of 270℃， and the corresponding digestion rate of alumina and removal rate of carbonate were 72.47% and 68.95% respectively. Cancrinite (Na₆(Al₆Si₆O₂₄)·Na₂CO₃·2H₂O) with panel structure is the main product in the carbonate removing process. Carbonate is easier to be removed from sodium aluminate solution when its concentration is lower than 25g·L^-1.

Key words: bauxite; digestion; sodium aluminate solution; carbonate; cancrinite

CLC Number:

TP20

WU Shi-peng， PAN Xiao-lin， WU Hong-fei， YU Hai-yan. Removal Behavior of Carbonate in Bauxite Digestion Process[J]. Journal of Northeastern University(Natural Science), 2022, 43(1): 33-39.

References

[1]王家伟，贾永真，李军旗，等.硫化钠对铝酸钠种分母液蒸发排盐的影响［J］.湿法冶金，2014，33(1):32-37.(Wang Jia-wei，Jia Yong-zhen，Li Jun-qi，et al.Effect of sodium sulfide on evaporation desalting from sodium aluminate seeded precipitation Bayer liquor ［J］.Hydrometallurgy of China，2014，33(1):32-37.)
[2]丁安平，杨权平.山西铝厂拜耳法系统碳酸钠的危害及排除措施［J］.有色冶炼，2000，29(5):10-14.(Ding An-ping，Yang Quan-ping.Harm of sodium carbonate in Bayer process system of shanxi aluminum plant and its countermeasures ［J］.Non-ferrous Smelting，2000，29(5):10-14.)
[3]Vogrin J，Santini T，Peng H，et al.The anion effect on sodium aluminosilicates formed under Bayer process digestion conditions ［J］.Hydrometallurgy，2020，192:1-9.
[4]潘晓林，吴艳，蒋涛，等.乙酸盐对拜耳法脱硅产物析出行为的影响［J］.东北大学学报(自然科学版)，2018，39(9):1262-1265，1320.(Pan Xiao-lin，Wu Yan，Jiang Tao，et al.Effect of acetate on precipitation behavior of desilication products during Bayer process ［J］.Journal of Northeastern University (Natural Science)，2018，39(9):1262-1265，1320.)
[5]王雅静，李宏亮，庞常健，等.阴离子对铝酸钠溶液深度脱硅的影响［J］.过程工程学报，2011，11(2):239-243.(Wang Ya-jing，Li Hong-liang，Pang Chang-jian，et al. Effects of anions on deep desilication of sodium aluminate solution ［J］.The Chinese Journal of Process Engineering，2011，11(2):239-243.)
[6]王雅静，李宏亮，翟玉春，等.碳酸钠对铝酸钠溶液深度脱硅的影响［J］.矿产综合利用，2011(4):41-44.(Wang Ya-jing，Li Hong-liang，Zhai Yu-chun，et al. Effect of sodium carbonate on deep desilication of sodium aluminate solution ［J］.Multipurpose Utilization of Mineral Resources，2011(4):41-44.)
[7]Chai Q Q，Yang C H，Teo K L，et al.Optimal control of an industrial-scale evaporation process:sodium aluminate solution ［J］.Control Engineering Practice，2012，20(6):618-628.
[8]Mahmoudian M，Ghaemi A，Shahhosseini S.Removal of carbonate and oxalate pollutants in the Bayer process using thermal and chemical techniques ［J］.Hydrometallurgy，2015，154:137-148.
[9]杨权平，邹若飞.氧化铝生产中蒸发器结垢的预防与清除［J］.有色冶金节能，2004，21(4):63-65.(Yang Quan-ping，Zou Ruo-fei.Prevention and cleaning of scabbing in evaporator in alumina production ［J］.Non-ferrous Metallurgy Energy Saving，2004，21(4):63-65.)
[10]刘彩玫，郭海峰，龙建华，等.母液中杂质成分对蒸发结晶过程的影响［J］.轻金属，2006(9):33-36.(Liu Cai-mei，Guo Hai-feng，Long Jian-hua，et al.The influence of impurity composition in the spent liquor on evaporating crystallization process ［J］. Light Metals，2006(9):33-36.)
[11]彭志宏，陈科云，李小斌，等.铝酸钠溶液蒸发过程中的结垢与防垢［J］.中南大学学报(自然科学版)，2008，39(1):69-74.(Peng Zhi-hong，Chen Ke-yun，Li Xiao-bin，et al. Scaling and anti-scale in evaporation process of sodium aluminate solutions ［J］.Journal of Central South University (Natural Science)，2008，39(1):69-74.)
[12]杨桂丽，娄世彬.拜耳法种分母液蒸发过程中钠盐析出规律的试验研究［J］.轻金属，2006(9):18-21.(Yang Gui-li，Lou Shi-bin.Experiment studies on the precipitation of sodium salt during the evaporation process of Bayer spent liquor ［J］.Light Metals，2006(9):18-21.)
[13]李其贵，刘永轶，尹中林.高碳铝土矿中碳酸盐在溶出过程中反应行为研究［J］.轻金属，2020(8):16-20.(Li Qi-gui，Liu Yong-yi，Yin Zhong-lin.Reaction behavior of carbonates in digestion process of high carbon bauxite ［J］.Light Metals，2020(8):16-20.)
[14]宋丽莉.蒸发排盐苛化实验研究［J］.有色冶金节能，2019，35(1):37-39.(Song Li-li.Experimental study on causticization of salt discharge with evaporative ［J］.Non-ferrous Metallurgy Energy Saving，2019，35(1):37-39.)
[15]Pan X L，Yu H Y，Dong K W，et al.Pre-desilication and digestion of gibbsitic bauxite with lime in sodium aluminate liquor ［J］.International Journal of Minerals Metallurgy and Materials，2012，19(11):973-977.
[16]Whittington B，Fallows T.Formation of lime-containing desilication product (DSP) in the Bayer process:factors influencing the laboratory modelling of DSP formation ［J］.Hydrometallurgy，1997，45(3):289-303.
[17]成琼文，李小斌，彭志宏，等.铝酸钠溶液的黏度［J］.中南大学学报(自然科学版)，2005，36(2):229-233.(Cheng Qiong-wen，Li Xiao-bin，Peng Zhi-hong，et al.Viscosity of sodium aluminate solution［J］.Journal of Central South University (Natural Science)，2005，36(2):229-233.)
[18]Gerson A R，Zheng K.Bayer process plant scale:transformation of sodalite to cancrinite ［J］.Journal of Crystal Growth，1997，171(1):209-218.
[19]Bames M C，Addai-Mensah J，Gerson A R.The mechanism of the sodalite-to-cancrinite phase transformation in synthetic spent Bayer liquor ［J］.Microporous and Mesoporous Materials，1999，31(3):287-302.
[20]Zheng K，Gerson A R，Addai-Mensah J，et al.The influence of sodium carbonate on sodium aluminosilicate crystallisation and solubility in sodium aluminate solutions ［J］.Journal of Crystal Growth，1997，171(1/2):197-208.
[21]Wu H F，Pan X L，Yu H Y，et al.Effect of carbonate on desilication of sodium aluminate solution at high temperature ［J］.Journal of Metals，2021，73:1180-1187.(上接第23页)
[15]Chang C J，Chiang T H，Tai C C.A modified self-tuning fuzzy logic temperature controller for metal induction heating［J］.Review of Scientific Instruments，2020，91(6):064905.
[16]Chowdhury J I，Thornhill D，Soulatiantork P.Control of supercritical organic rankine cycle based waste heat recovery system using conventional and fuzzy self-tuned PID controllers［J］.International Journal of Control，Automation and Systems，2019，17(11):2969-2981.
[17]Wang Y，Cao F.Induction heating power supply temperature control based on a novel fuzzy controller［C］// 2008 International Conference on Computer and Electrical Engineering.Phuket:IEEE Computer Society，2008:615-618.
[18]Fu T Y，Xu J Z，Zhao H.Analysis of induction heating temperature field of plain weave CFRP based on finite element meso model［J］.Applied Composite Materials， 2021，28(1):149-163.
[19]Qiao J F，Han G T，Han H G，et al.Decoupling control for wastewater treatment process based on recurrent fuzzy neural network［J］.Asian Journal of Control，2019，21(3):1270-1280.
[20]王爽.基于PCC的多变量温度控制与智能算法研究［D］.广州:华南理工大学，2012.(Wang Shuang.Research on multivariable temperature control and intelligent algorithm based on PCC［D］.Guangzhou:South China University of Technology，2012.)