矿产保护与利用2025，Vol.45Issue(6)：52-61,10.DOI:10.13779/j.cnki.issn1001-0076.2024.09.002
机械力活化对蛇纹石晶体结构与反应活性的影响研究
Effects of Mechanochemical Activation on the Crystal Structure and Reactivity of Serpentine
摘要
Abstract
Naturally-occurring serpentine[Mg3Si2O5(OH)4],as one of the typical magnesium-rich layered clay minerals,is widely distributed in nature and has good industrial application prospects.However,the reactivity of natural serpentine is commonly low due to its stable crystal structure,which requires certain pre-treatment methods to increase the reactivity of serpentine to improve its utilization efficiency.Therefore,taking natural serpentine as an object,this paper employed ball-milling method to pretreat serpentine,and systematically investigated the effectiveness and mechanism of mechanochemical activation on its crystal structure and reactivity using XRD,FTIR,TG-DSC and SEM analytical techniques.Characterization results indicated that mechanochemical activation could induce serious deformation of octahedral structure within serpentine crystal and the rupture of a large number of Mg-O(H)bonds,gradually turning serpentine crystals to be amorphous state as the milling time increased.The solubility of serpentine in water and the fixation efficiency for heavy metal ions by activated serpentine were also measured.The results showed that after activation at 600 r/min for 5 min,the dissolution of 0.05 g serpentine in 100 mL water rapidly increased the solution pH to 9.98.The solution pH further increased to 10.45 as the ball-milling time extended to 60 min,with a Mg2+dissolution concentration of activated serpentine approximately 11 times that of raw serpentine.Moreover,when the dosage of activated serpentine for 60 min was 0.5 g/L,the initial concentration of heavy metal ions was 100 mg/L,and the reaction time was 120 min,all the removal rate of Cu2+,Pb2+,Fe2+and Ni2+ions were greater than 95%,and the adsorption capacity of Cd2+and Mn2+ions reached to nearly 50 mg/g,which were much higher than the efficiency of heavy metal removal by thermally-activated serpentine under the same experimental conditions,reflecting the advantages of the lattice activation and reactivity improvement of serpentine based on mechanochemical activation.Mechanochemically activated serpentine could be potentially applied to the preparation of clay mineral-based functional materials and treatment of heavy metal pollution,promoting the coordinated development of resources and environment.In general,these obtained findings may provide certain technical supports for the mechanochemical activation of layered clay minerals such as serpentine and their applications as well.关键词
黏土矿物/蛇纹石/机械力活化/晶体结构/反应活性/重金属去除Key words
clay minerals/serpentine/mechanochemical activation/crystal structure/reactivity/heavy metal removal分类
矿业与冶金引用本文复制引用
陈敏,王超,黄俊玮,张其武,李钊..机械力活化对蛇纹石晶体结构与反应活性的影响研究[J].矿产保护与利用,2025,45(6):52-61,10.基金项目
河北省岩石矿物材料重点实验室开放基金项目(RM2024004) （RM2024004）
辽宁省科技厅博士启动项目(2025-BS-0367) （2025-BS-0367）
