摘要
单宁沉锗工艺被广泛用于湿法炼锌溶液中低浓度锗的回收,但该方法有机物引入量大,严重影响湿法炼锌系统的高效运转。为此,通过借助TOC、FT-IR、XRD、UV-Vis等表征手段,本文考察了改性阳极泥对沉锗后液中有机物的脱除效果,并揭示了其反应机理。结果表明,在温度为80℃,硫酸用量为14 mL/100 g条件下进行阳极泥活化,所得改性阳极泥对沉锗后液中有机物具有良好的脱除效果。阳极泥用量为20 g/L时,TOC脱除率可达66.17%,反应后液TOC浓度可降至58.21 mg/L。这一效果与改性过程中阳极泥中惰性的α-MnO_(2)转化为高活性的MnOOH有关,且硫酸用量和温度对阳极泥改性效果影响较为显著。沉锗后液中主要的有机物为单宁酸及其衍生物,经改性阳极泥处理后,沉锗后液中的单宁酸发生了不完全降解,降解产物主要是小分子量的烃类有机物。
Germanium precipitation with tannic is widely used to recover low concentration germanium from zinc hydrometallurgy solution.However,the amount of organic matter introduced by this process is large,which seriously affects the efficient operation of zinc hydrometallurgy system.Therefore,with the help of TOC,FT-IR,XRD,UV-vis,and other characterization methods,the removal effect of modified anode slime on the organic matter in the germanium precipitated solution was investigated,and then the reaction mechanism was revealed.The results show that the modified anode slime obtained from the activation of anode slime at a temperature of 80℃and a sulfuric acid dosage of 14 mL/100 g has a good removal effect of the organic matter in the germanium precipitated solution.When the amount of anode slime is 20 g/L,the TOC removal rate can reach 66.17%,and the TOC concentration in the reaction solution can be reduced to 58.21 mg/L.This effect is related to the conversion of inertα-MnO_(2) into highly active MnOOH in the anode slime during the modification process,and the amount of sulfuric acid and temperature have a significant influence on the modification effect of anode slime.The main organic substances in germanium precipitated solution are tannic acid and its derivatives.After the treatment with modified anode slime,the tannic acid in the solution after germanium precipitation undergoes incomplete degradation,and the degradation products are mainly small molecular weight hydrocarbon organics.
作者
刘然
李玉虎
杨裕东
杨思杰
LIU Ran;LI Yuhu;YANG Yudong;YANG Sijie(Faculty of Materials Metallurgical Chemistry,Jiangxi University of Science and Technology,Ganzhou 341000,Jiangxi,China)
出处
《有色金属科学与工程》
CAS
北大核心
2024年第3期351-356,共6页
Nonferrous Metals Science and Engineering
基金
江西省双千计划创新创业领军人才项目(jxsq2018106051)
江西理工大学清江青年拔尖支持计划(JXUSTQJBJ2018005)。
关键词
湿法炼锌
有机物
改性
阳极泥
氧化降解
zinc hydrometallurgy
organics
modification
anode slime
oxidative degradation
作者简介
通信作者:李玉虎(1979-),博士,副教授,主要从事有色金属绿色冶炼与高值利用研究。E-mail:lyh_csu@163.com。
