石灰苛化法脱除草酸钠的研究  

Study on Removal of Sodium Oxalate by Lime Causticizing Method

作　　者：房辉 宋玉来 FANG Hui SONG Yu-lai(Longkou Donghai Alumina Co. , Ltd. , Longkou 265713, Shandong, China School of Materials and Metallurgy, University of Science and Technology Liaoning, Anshan 114044, Liaoning, China)

机构地区：[1]龙口东海氧化铝有限公司,山东龙口265713 [2]辽宁科技大学材料与冶金学院,辽宁鞍山114044

出　　处：《有色金属（冶炼部分）》2017年第1期36-39,共4页Nonferrous Metals（Extractive Metallurgy)

摘　　要：探讨了苛碱浓度、温度、时间、分子比对石灰苛化法苛化效率的影响,并确定了苛化工艺的最佳条件。研究表明,苛化效率随苛碱浓度增加而降低,随温度升高先上升后下降,随反应时间延长而升高并趋于稳定,随分子比增加而升高。在苛碱浓度16g/L、温度60℃、时间60min、分子比2.5的条件下,苛化效率可达到81%。工业应用表明,该工艺流程简单、设备投资少、苛化成本低,既能高效脱除草酸钠又能有效减少氧化铝的损失。Effects of alkali concentration, temperature, time, and molecular ratio on causticizing efficiency of lime causticizing method were investigated. The optimum conditions of causticizing process were determined. The results shows that causticizing efficiency drops with increase of alkali concentration, rises firstly and then drops with increase of temperature, rises with increase of reaction time and tends to stable, and rises with increase of molecular ratio. Causticizing efficiency is 81% under the conditions including alkali concentration of 16 g/L, temperature of 60 ℃, time of 60 min, and molar ratio of 2.5. Industrial practice shows that simple with low investment and low cost caustification, this process can efficiently remove sodium oxalate and reduce loss of alumina.

关 键 词：石灰 草酸钠 苛化效率 

分 类 号：TF821[冶金工程—有色金属冶金]