用于钨回收的新型聚氯乙烯基季铵化三乙醇氯化铵阴离子交换剂的合成、表征及物理化学性质

Synthesis, characterization, and physico-chemical aspects of a new PVC-based quaternary triethanol ammonium chloride anionite for tungsten recovery.

作者信息

Atia Bahig

机构信息

Department of Geology of Isotopes, Research Sector, Nuclear Materials Authority, El Maadi, Cairo, Egypt.

出版信息

Turk J Chem. 2024 Mar 13;48(4):524-549. doi: 10.55730/1300-0527.3678. eCollection 2024.

Abstract

The usability of polyvinyl chloride-based quaternary triethanol ammonium chloride anionite (PVC-TEAC) as a potential extractant for tungstate was investigated to recover tungstate from Gabal Qash Amir, Egypt, assaying 70.91% WO. Structure elucidation for PVC-TEAC anionite was successfully carried out using several techniques. Experimental measurements, such as pH, agitation time, initial tungsten concentration, anionite dose, co-ions, temperature, and eluting agents, have been optimized. It was found that PVC-TEAC anionite has a maximum capacity of 63 mg per gram. From the distribution isotherm modeling, Langmuir's model fits the experimental results better than Freundlich's, with a theoretical value of 61.728 mg g. According to kinetic modeling, the first- and second-order modeling may be regarded as a mixed modeling for a successful adsorption system. Thermodynamic prospects reveal that the adsorption process was predicted as an exothermic, spontaneous, and preferable adsorption at low temperatures. Tungsten ions can be eluted from the loaded anionite, by 1M HSO with a 97% efficiency rate. It was found that PVC-TEAC anionite reveals good separation factor (S.F.) towards most of co-ions. A successful Alkali fusion with NaOH flux followed by tungstate recovery by PVC-TEAC anionite is used to obtain a high-purity tungsten oxide concentrate (WO), with a tungsten content of 78.3% and a purity of 98.75%.

摘要

研究了基于聚氯乙烯的季铵化三乙醇氯化铵阴离子交换剂(PVC - TEAC)作为钨酸盐潜在萃取剂的可用性,以从埃及加巴尔卡什阿米尔地区(钨含量为70.91% WO₃)回收钨酸盐。使用多种技术成功地对PVC - TEAC阴离子交换剂进行了结构解析。对诸如pH值、搅拌时间、初始钨浓度、阴离子交换剂剂量、共存离子、温度和洗脱剂等实验测量参数进行了优化。结果发现,PVC - TEAC阴离子交换剂的最大容量为每克63毫克。从分配等温线模型来看,朗缪尔模型比弗伦德利希模型更符合实验结果,理论值为61.728毫克/克。根据动力学模型,一级和二级模型可被视为成功吸附系统的混合模型。热力学分析表明,吸附过程预计是一个放热、自发且在低温下更有利的吸附过程。负载的阴离子交换剂中的钨离子可用1M H₂SO₄洗脱,洗脱效率为97%。结果发现,PVC - TEAC阴离子交换剂对大多数共存离子显示出良好的分离因子(S.F.)。采用与氢氧化钠助熔剂进行碱熔,随后用PVC - TEAC阴离子交换剂回收钨酸盐的方法,成功获得了高纯度氧化钨精矿(WO₃),钨含量为

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/274f/11407338/9059b3cb89b6/tjc-48-04-524f1.jpg

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