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以碱熔分解锆英砂所得到的碱熔料为原料,研究其在水洗过程中液固比和水洗温度对碱熔料除硅效率的影响。通过扫描电子显微镜(SEM)和X射线衍射仪(XRD)分析了碱熔料与水洗料的颗粒形貌以及相结构。研究结果表明:液固比由4∶1增长至6∶1时,水洗除硅效率由22.8%增长至51.35%。当液固比超过6∶1之后,水洗除硅效率不再有明显变化。水洗除硅效率随着水洗温度的升高近乎是线性增加关系。适宜的水洗除硅工艺条件为:液固比为6∶1,水洗温度为60℃,此条件下碱熔料的除硅效率达到59.5%。碱熔料中Na2Si O3和Na4Si O4的衍射峰在水洗后消失,Na2Zr O3的衍射峰宽化且强度减弱。对比碱熔料与水洗料的形貌变化,发现水洗料颗粒松散,无明显团聚现象,有利于后续的转型、酸浸工序的进行。
The effect of liquid-solid ratio and water washing temperature on the silicon removal efficiency of alkali frit was studied by using alkaline melt obtained from alkali dissolution zircon sand. The particle morphology and phase structure of alkali melt and water washing material were analyzed by scanning electron microscopy (SEM) and X-ray diffraction (XRD). The results show that when the ratio of liquid to solid increases from 4: 1 to 6: 1, the silicon efficiency of water washing increases from 22.8% to 51.35%. When the liquid-solid ratio exceeds 6: 1, the efficiency of the water-washing silicon is no longer significantly changed. The silicon efficiency of water washing increases almost linearly with the increase of water washing temperature. The optimum technological conditions for the removal of silicon from water were as follows: the ratio of liquid to solid was 6:1, the temperature of washing was 60 ℃, the silicon removal efficiency of alkali melt reached 59.5%. The diffraction peaks of Na2SiO3 and Na4SiO4 in the alkali melt disappear after washing with water, and the diffraction peak of Na2ZrO3 is broadened and the intensity is weakened. Compared with the morphological changes of the alkali melt and the water washing material, it was found that the water washing material particles are loose and have no obvious agglomeration phenomenon, which is favorable for the subsequent transformation and acid leaching process.