草酸盐对水合铝硅酸钠析出行为的影响
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摘要
系统研究了在145℃下不同草酸钠浓度对脱硅产物水合铝硅酸钠的粒度分布、微观结构和析出活性的影响规律.结果表明,随着铝酸钠溶液中草酸钠浓度的升高,水合铝硅酸钠的粒度逐渐细化;草酸钠增加了水合铝硅酸钠"毛线团"形晶粒的圆片状结构的厚度,并提高了其团聚程度;草酸钠不改变脱硅产物的物相组成,但使沸石含量降低,方钠石含量升高,同时降低了沸石和方钠石的结晶度,最终提高了水合铝硅酸钠的析出活性.
Efects of different concentrations of sodium oxalate on particle size distribution,microstructure and precipitation activity of sodium aluminosilicate hydrate were studied. The results showed that with increase of oxalate concentration in sodium aluminate solution,particle size of sodium aluminosilicate hydrate is gradually refined. Sodium oxalate can increase thickness of the disc structure of sodium aluminosilicate hydrate with wool-like grains and improve degree of aggregation. Sodium oxalate does not change the phase composition of desilication products,but decreases zeolite content and increases sodalite content; it also reduce crystallinity of zeolite and sodalite,and finally increases precipitation activity of sodium aluminosilicate hydrate.
Efects of different concentrations of sodium oxalate on particle size distribution,microstructure and precipitation activity of sodium aluminosilicate hydrate were studied. The results showed that with increase of oxalate concentration in sodium aluminate solution,particle size of sodium aluminosilicate hydrate is gradually refined. Sodium oxalate can increase thickness of the disc structure of sodium aluminosilicate hydrate with wool-like grains and improve degree of aggregation. Sodium oxalate does not change the phase composition of desilication products,but decreases zeolite content and increases sodalite content; it also reduce crystallinity of zeolite and sodalite,and finally increases precipitation activity of sodium aluminosilicate hydrate.
引文
[1]Power G,Loh J.Organic compounds in the processing of lateritic bauxites to alumina:Part 1:Origins and chemistry of organics in the Bayer process[J].Hydrometallurgy,2010,105:1-29.
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[10]吕子剑,毕诗文,谢雁丽,等.草酸钠对赤泥沉降过程的影响[J].材料与冶金学报,2006,5(2):105-108.(Lv Zijian,Bi Shiwen,Xie Yanli,et al.Effect of sodium oxalate on processes of red mud sedimentation[J].Journal of Materials and Metallurgy,2006,5(2):105-108.)
[11]Pan X,Yu H,T u G,et al.Effects of precipitation activity of desilication products(DSPs)on stability of sodium aluminate solution[J].Hydrometallurgy,2016,165:261-269.
[12]潘晓林,蒋涛,侯宪林,等.拜耳法过程水合铝硅酸钠析出活性研究[J].中国有色金属学报,2017,27(8):1748-1755.(Pan Xiaolin,Jiang T ao,Hou Xianlin,et al.Precipitation activity of sodium aluminosilicate hydrate during the Bayer process[J].T he Chinese Journal of Nonferrous Metals,2017,27(8):1748-1755.)
[2]Power G,Loh J S C,Vernon C.Organic compounds in the processing of lateritic bauxites to alumina Part 2:Effects of organics in the Bayer process[J].Hydrometallurgy,2012,127-128:125-149.
[3]张佰永,毕诗文,潘晓林,等.低温拜耳法过程有机物的积累和对氧化铝生产的影响[J].轻金属,2016(11):14-17.(Zhang Baiyong,Bi Shiwen,Pan Xiaolin,et al.T he influence of accumulation of organics on alumina production in low temperature Bayer process[J].Light Metals,2016(11):14-17.)
[4]Power G,Loh J S C,Wajon J E,et al.A review of the determination of organic compounds in Bayer process liquors[J].Analytica Chimica Acta,2011,689:8-21.
[5]Machold T,Macedi E,Laird D W,et al.Decomposition of bayer process organics:low-molecular-weight carboxylates[J].Hydrometallurgy,2009,99:51-57.
[6]陈文汨,汤家明,张利.拜耳工艺中草酸钠问题的研究现状[J].轻金属,2005(5):11-15.(Chen Wenmi,T ang Jiaming,Zhang Li.Overview of the researches on the problem of sodium oxalate in bayer process[J].Light Metals,2005(5):11-15.)
[7]T he P J,Bush J F.Solubility of sodium oxalate in Bayer liquor and a method of control[J].Light Metals,1987:5-10.
[8]Fu W,Vaughan J,Gillespie A.In situ AFM investigation of heterogeneous nucleation and growth of sodium oxalate on industrial gibbsite surfaces in concentrated alkaline solution[J].Chemical Engineering Science,2015,126:399-405.
[9]Beckham K R,Grocott S C.A thermodynamically based model for oxalate solubility in Bayer liquor[J].Light Metals,1997,167-172.
[10]吕子剑,毕诗文,谢雁丽,等.草酸钠对赤泥沉降过程的影响[J].材料与冶金学报,2006,5(2):105-108.(Lv Zijian,Bi Shiwen,Xie Yanli,et al.Effect of sodium oxalate on processes of red mud sedimentation[J].Journal of Materials and Metallurgy,2006,5(2):105-108.)
[11]Pan X,Yu H,T u G,et al.Effects of precipitation activity of desilication products(DSPs)on stability of sodium aluminate solution[J].Hydrometallurgy,2016,165:261-269.
[12]潘晓林,蒋涛,侯宪林,等.拜耳法过程水合铝硅酸钠析出活性研究[J].中国有色金属学报,2017,27(8):1748-1755.(Pan Xiaolin,Jiang T ao,Hou Xianlin,et al.Precipitation activity of sodium aluminosilicate hydrate during the Bayer process[J].T he Chinese Journal of Nonferrous Metals,2017,27(8):1748-1755.)