CAJ | 학술논문

研究了硫化钠对拜耳法铝酸钠种分母液蒸发排盐的影响。结果表明：铝酸钠溶液深度蒸发排盐渣中主要存在Na2 CO3· H2 O和NaAlO2·1．25H2 O ；当苛性碱质量浓度（NK ）为300～310 g/L时，碳酸钠能有效析出且不导致NaAlO2析出过高；随硫化钠添加量增加，Na2 CO3、硫盐和NaAlO2析出率提高，排盐率提高且均在60％以上，硫化钠质量浓度（ NS ）为4 g/L时排盐效果最佳；将硫质量浓度（ NS ）为4．5 g/L的铝酸钠溶液蒸发至苛性碱质量浓度（NK ）为310 g/L时，排盐渣中存在Na2 CO3· H2 O、NaAlO2·1．25H2 O、Na2 S、Na2 S2 O3、Na2 SO3及Na2 CO3· Na2 SO3，同时，约有7％和4％的S2-分别被氧化为S2＋和S4＋，而亚硫酸钠与碳酸钠更容易结晶形成复盐Na2 CO3· Na2 SO3而析出；碳酸钠和各价态硫化合物交互作用，影响蒸发排盐效果。
연구료류화납대배이법려산납충분모액증발배염적영향。결과표명：려산납용액심도증발배염사중주요존재Na2 CO3· H2 O화NaAlO2·1．25H2 O ；당가성감질량농도（NK ）위300～310 g/L시，탄산납능유효석출차불도치NaAlO2석출과고；수류화납첨가량증가，Na2 CO3、류염화NaAlO2석출솔제고，배염솔제고차균재60％이상，류화납질량농도（ NS ）위4 g/L시배염효과최가；장류질량농도（ NS ）위4．5 g/L적려산납용액증발지가성감질량농도（NK ）위310 g/L시，배염사중존재Na2 CO3· H2 O、NaAlO2·1．25H2 O、Na2 S、Na2 S2 O3、Na2 SO3급Na2 CO3· Na2 SO3，동시，약유7％화4％적S2-분별피양화위S2＋화S4＋，이아류산납여탄산납경용역결정형성복염Na2 CO3· Na2 SO3이석출；탄산납화각개태류화합물교호작용，영향증발배염효과。
The effect of sodium sulfide on evaporation desalting from sodium aluminate seeded precipitation mother solution in bayer process was studied .The results show that after depth evaporation ,Na2 CO3 · H2 O and NaAlO2 · 1 .25H2 O are mainly phases in the desalting .Sodium carbonate can precipitated effectively but NaAlO2 doesn’t when NK is 300-310 g/L .Na2CO3 ,sulfursalt and NaAlO2 precipitation rate increase with increasing of Na2 S additive amount .The desalting effect is good when NS is 4 .5 g/L .There are Na2 CO3 · H2 O ,NaAlO2 · 1 .25H2 O ,Na2 S ,Na2 S2 O3 ,Na2 SO3 and Na2 CO3 · Na2 SO3 in desalting slag when the sodium aluminate solution (NS is 4 .5 g/L) is evaporated to NK =310 g/L . S2 - of about 7% and 4% is oxidated to S2+ and S4+ .T he sodium sulfite crystallize to form double salts with sodium carbonate .The double salts is easy to precipitate .Desalting effect is influenced by the interaction of sodium carbonate and each valence state sulfur compounds .