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玻璃分相联用机械化学法脱除废旧含铅玻璃中重金属铅
供稿: 邢明飞, 吴小芳, 刘元杰, 赵丽 时间: 2024-07-05 次数:

邢明飞, 吴小芳, 刘元杰,.玻璃分相联用机械化学法脱除废旧含铅玻璃中重金属铅[J].河南理工大学学报(自然科学版),2024,43(4):96-102.

XING M F, WU X F, LIU Y J, et al.Removing heavy metal lead from waste leaded glass by phase separation in glass and mechanochemical method[J].Journal of Henan Polytechnic University(Natural Science) ,2024,43(4):96-102.

玻璃分相联用机械化学法脱除废旧含铅玻璃中重金属铅

邢明飞, 吴小芳, 刘元杰, 赵丽

河南理工大学 资源环境学院,河南 焦作454000

摘要:传统分相法采用热酸浸提工艺脱除CRT锥玻璃分相产物中重金属铅,酸浸过程强酸消耗量大,废酸无法回用,易引发酸污染。 目的 为了绿色、高效回收CRT锥玻璃分相产物中重金属铅, 方法 采用乙二胺四乙酸(EDTA)作为浸提剂,通过机械化学法研究锥玻璃中重金属在快速分相和机械活化浸出过程中的迁移转化规律,揭示影响重金属脱除率的主要因素和作用机制。 结果 结果表明:在分相处理过程中锥玻璃所含PbKCa等元素主要富集在呈连通结构的富B2O3相中。在随后湿法球磨浸提过程中,分相产物中富B2O3相在机械活化作用下快速溶解到水中,同时富B2O3相中所含金属离子与EDTA形成可溶络合物,且可从分相产物中脱除。锥玻璃所含PbKCa等金属脱除率随EDTA添加量增大、球磨转速提高、球磨时间延长等不断提升,但随液固比增大呈先升高后降低趋势。当EDTA添加量(质量分数,下同)为80%,球磨转速500 rpm,液固比0.8时,球磨处理30 min,分相产物中PbKCaAl脱除率分别达到98.79%94.92%95.17%65.71%,获得SiO2质量分数超过92%的高硅氧玻璃粉末。 结论  研究结果可为含重金属玻璃绿色、高附加值利用提供借鉴与参考。

关键词:CRT锥玻璃;玻璃分相;机械化学法;铅回收;EDTA

doi:10.16186/j.cnki.1673-9787.2022040047

基金项目:国家自然科学基金资助项目(51508165);河南省重点研发与推广专项(科技攻关)项目(212102310061212102310502);河南理工大学杰出青年基金资助项目(J2022-2

收稿日期:2022/04/19

修回日期:2022/06/01

出版日期:2024/07/15

Removing heavy metal lead from waste leaded glass by phase separation in glass and mechanochemical method

XING Mingfei, WU Xiaofang, LIU Yuanjie, ZHAO Li

School of Resources and EnvironmentHenan Polytechnic UniversityJiaozuo 454000HenanChina

Abstract:The traditional phase separation used hot acid leaching process to remove heavy metal lead from phase separation product of cathode ray tubeCRT funnel glass.Howeverthe acid leaching process consumed a large amount of strong acidthe waste acid cannot be reused and may cause acid pollution.  Objectives  In order to achieve green and efficient recovery of heavy metal lead from the phase separation product of CRT funnel glass Methods  ethylene diamine tetraacetic acidEDTA was selected as the extractant  through mechanochemical method.By studying the migration and transformation laws of heavy metals in funnel glass during the rapid phase separation process and mechanical activation leaching processthe main factors and action mechanism affecting the removal rate of heavy metals were revealed.  Results The results showed that during the phase separation processPbKCa and other elements contained in the funnel glass were mainly enriched in the B2O3-rich phase with interconnected structure.During the subsequent wet ball milling extraction processthe B2O3-rich phase was rapidly dissolved into water under mechanical activationmeanwhilemetal cations contained in the B2O3-rich phase formed soluble complex with EDTAand which can be removed from the phase separation product.The extraction rate of PbKCa and other metals increased with the increase of EDTA additionball milling speed and ball milling timebut it shows a trend of first increasing and then decreasing with the increase of water/solid ratio.When the EDTA addition amount was 80%milling speed was 500 rpmliquid-solid ratio was 0.8 and ball milling time was 30 minandthe extraction rates of PbKCaAl were 98.79%94.92%95.17% and 65.71%respectivelyand high silica glass powder with silica purity exceeding 92% was obtained.  Conclusions  This study provided reference and guidance for the green and high value-added utilization of heavy metal containing glass.

Key words:CRT funnel glass;glass phase separation;mechanochemical method;lead recovery;EDTA

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