CAJ | 학술논문

采用激光浊度法对亚熔盐法粉煤灰提铝清洁工艺中硫酸钠在亚熔盐介质中的过饱和性进行了研究。结果表明：对亚熔盐介质进行真空蒸发时，其中的硫酸钠达到平衡浓度时即从体系中结晶析出，表明硫酸钠在亚熔盐介质中几乎无过饱和性。此外，杂质二氧化硅与碳酸钠对硫酸钠在铝酸钠溶液中的过饱和性具有一定影响，二氧化硅杂质会使硫酸钠析晶点碱浓度提高到20 g/L左右；碳酸钠会使硫酸钠析晶点碱浓度降低至15 g/L左右。同时，对析出晶体的物相分析表明：杂质二氧化硅的存在会使析出晶体向钠硅渣转变，而杂质碳酸钠的存在会使析出晶体向碳钠矾复盐转变。
채용격광탁도법대아용염법분매회제려청길공예중류산납재아용염개질중적과포화성진행료연구。결과표명：대아용염개질진행진공증발시，기중적류산납체도평형농도시즉종체계중결정석출，표명류산납재아용염개질중궤호무과포화성。차외，잡질이양화규여탄산납대류산납재려산납용액중적과포화성구유일정영향，이양화규잡질회사류산납석정점감농도제고도20 g/L좌우；탄산납회사류산납석정점감농도강저지15 g/L좌우。동시，대석출정체적물상분석표명：잡질이양화규적존재회사석출정체향납규사전변，이잡질탄산납적존재회사석출정체향탄납반복염전변。
The supersaturation of sodium sulfate in sub-molten salt during the process of extracting alumina from fly ash by sub-molten method was investigated by laser-turbidity method. The results show that during the process of vaporization, when the concentration of sodium sulfate in sub-molten salt exceeds the limit of solubility, it will be deposited out in solid form. There is not an obvious supersaturation phenomenon for the sodium sulfate in vaporization process. The impurities of silica and sodium carbonate have certain influences on the supersaturation of sodium sulfate in sub-molten salt. The silicon impurity increases the crystallization alkali concentration of sodium sulfate by 20 g/L. On the other hand, the sodium carbonate decreases the crystallization alkali concentration of sodium sulfate by 15 g/L. Meanwhile, the results of X ray diffraction analyses indicates that the SiO2 changes the crystal from crystalline precipitated to sodium-silicon residue,while the addition of Na2CO3 changes crystals to the burkeite.