工业铝酸钠溶液中腐殖酸的检测分析及降解规律研究  

Analytical method and degradation regularity of humic acid in industrial odium aluminate solution

作　　者：王明理 皮溅清 赵志强 范尚 韦金钏 WANG Mingli;PI Jianqing;ZHAO Zhiqiang;FAN Shang;WEI Jinchuan(School of Metallurgy,Northestern University,Shengyang 110819,China;Guangxi Tiandong Jinxin Chemical Co.Ltd.,Baise 533000,China;Management Headquarters,Cayman Aluminum(Sanmenxia)Co.Ltd.,Hangzhou 310000,China;School of Metallurgy and Environment,Central South University,Changsha 410000,China)

机构地区：[1]东北大学冶金学院,辽宁沈阳110819 [2]广西田东锦鑫化工有限公司,广西百色533000 [3]开曼铝业(三门峡)有限公司管理总部,浙江杭州310000 [4]中南大学冶金与环境学院,湖南长沙410000

出　　处：《中国有色冶金》2024年第3期72-80,共9页China Nonferrous Metallurgy

摘　　要：铝酸钠溶液中的有机物对氧化铝生产危害较大,目前铝酸钠溶液中腐殖酸浓度测定操作流程繁琐、测定结果准确度低,本文创新性提出了以“萃取-沉淀法”测定的腐殖酸浓度为基础,采用“吸光光度法”快速测定腐殖酸浓度的方法,并探讨进入工业铝酸钠溶液中的腐殖酸在高温循环过程中的降解规律,得到以下主要结论。萃取-沉淀法测定的原理是在反萃溶液中加入钡盐溶液沉淀腐殖酸,然后焙烧沉淀物,通过焙烧产物的质量推算腐殖酸浓度,试验用工业铝酸钠溶液中的腐殖酸浓度为1.80 g/L;吸光光度法测定的原理是先通过试验测定吸光度曲线方程Y=1.6298X-0.1628,再测定待测溶液吸光度,吸光度测量值应在0.2~2.0之间,代入方程即可计算出待测溶液中的腐殖酸浓度。温度和时间对腐殖酸的去除影响较大,温度越高,保温时间越长腐殖酸的去除率越高,280℃保温1 h后,腐殖酸去除率为68.30%;温度和时间对铝酸钠溶液中的总有机碳,以及丙二酸根、甲酸根、乙酸根、丁二酸根和草酸等小分子酸的质量浓度影响不大,但是草酸根质量浓度在长时间保温后则有较大幅度的增加,工业生产中需关注草酸钠质量浓度的变化。The organic matter in sodium aluminate solution poses a significant threat to the production of alumina.Currently,the determination of humic acid concentration in sodium aluminate solution is cumbersome and the accuracy of the measurement results is low.This article innovatively proposes a method based on the humic acid concentration measured by the“extraction precipitation method”,using the“absorbance method”to quickly determine the humic acid concentration,and explores the degradation law of humic acid entering industrial sodium aluminate solution during high-temperature cycling.The main conclusions are as follows.The principle of extraction precipitation method is to add barium salt solution to the reverse extraction solution to precipitate humic acid,then calcine the precipitate,and calculate the humic acid concentration by the mass of the calcined product.The humic acid concentration in the industrial sodium aluminate solution used in the experiment is 1.80 g/L;The principle of absorbance measurement is to first determine the absorbance curve equation Y=1.6298X-0.1628 through experiments,and then measure the absorbance of the solution to be tested.The absorbance measurement value should be between 0.2 and 2.0,and the concentration of humic acid in the solution to be tested can be calculated by substituting it into the equation.Temperature and time have a significant impact on the removal of humic acid.The higher the temperature,the longer the insulation time,and the higher the removal rate of humic acid.After insulation at 280℃ for 1 h,the removal rate of humic acid is 68.30%;Temperature and time have little effect on the total organic carbon in sodium aluminate solution,as well as the mass concentration of small molecular acids such as malonate,formate,acetate,succinate,and oxalic acid.However,the mass concentration of oxalate increases significantly after prolonged insulation,and industrial production needs to pay attention to the changes in the mass concentration of sodium oxalate.

关 键 词：铝冶炼 铝酸钠溶液 有机物检测 腐殖酸浓度 萃取-沉淀法 吸光光度法 腐殖酸去除率 降解规律 

分 类 号：TF821[冶金工程—有色金属冶金] TF03