CAJ | 학술논문

除去铬酸钾溶液中的铝并实现铝化合物的再利用是实现清洁、经济地生产铬盐的关键步骤。采用碳分的方法从配制的高 K2O/Al 摩尔比铬酸钾溶液中去除铝。考察反应温度、碳分时间、CO2流量、晶种系数对铝沉淀率的影响。优化反应条件为：反应温度为50°C，碳分时间为100 min，CO2流量为0.1 L/min，晶种系数为1.0。碳分产物为三水铝石。采用X射线衍射仪、扫描电镜和激光粒度仪对产物的结构和形貌进行表征。实验结果表明，产物的粒度和形貌受实验条件影响明显。产物的平均粒径为16.72μm。对三水铝石的热分解路径进行研究。产物α-Al2O3含少量杂质(0.08% Cr2O3和0.10% K2O)，适于后续利用。
제거락산갑용액중적려병실현려화합물적재이용시실현청길、경제지생산락염적관건보취。채용탄분적방법종배제적고 K2O/Al 마이비락산갑용액중거제려。고찰반응온도、탄분시간、CO2류량、정충계수대려침정솔적영향。우화반응조건위：반응온도위50°C，탄분시간위100 min，CO2류량위0.1 L/min，정충계수위1.0。탄분산물위삼수려석。채용X사선연사의、소묘전경화격광립도의대산물적결구화형모진행표정。실험결과표명，산물적립도화형모수실험조건영향명현。산물적평균립경위16.72μm。대삼수려석적열분해로경진행연구。산물α-Al2O3함소량잡질(0.08% Cr2O3화0.10% K2O)，괄우후속이용。
For the clean and economical production of chromium compounds, it is crucial to remove aluminates from chromate alkali solutions and utilize aluminum-containing compounds. In this work, carbonization was used to remove aluminates from a synthetic chromate leaching solution containing a high K2O/Al2O3 mole ratio. The influence of reaction temperature, carbonization time, flow rate of carbon dioxide, and seed ratio on the precipitation of Al was investigated. The optimal output was obtained under the following experimental conditions: a reaction temperature of 50 °C, a carbonization time of 100 min, a carbon dioxide flow rate of 0.1 L/min, and a seed ratio of 1.0. Gibbsite was obtained following carbonization. The structure and morphology of the gibbsite were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and laser particle size analyzer. The particle size distribution and morphology of the gibbsite were significantly influenced by the experimental conditions. The gibbsite had a mean particle size (d50) of 16.72μm. The thermal decomposition of the gibbsite was analyzed by XRD and the decomposition path was determined. The obtained coarseα-Al2O3 precipitate, which contains 0.08% Cr2O3 and 0.10% K2O, was suitable for subsequent utilization.