矿产保护与利用2025，Vol.45Issue(6)：62-72,11.DOI:10.13779/j.cnki.issn1001-0076.2025.08.006
萤石尾矿制备水化硅酸钙及其对镍离子的吸附性能
Preparation of Functional Material Based on Fluorite Tailings and Its Adsorption Performance of Ni2+in Water
摘要
Abstract
It is significant for the ecological and environmental protection to explore low-cost adsorbents for the efficient removal of heavy metal ions from industrial wastewater.In this work,fluorite tailings were used as raw material and treated through alkaline fusion at 600℃for 3 hours to extract silicon component.Subsequently,the extracted silicon component was converted into mesoporous molecular sieve(MCM-41)via a low-temperature crystallization method.Particularly,cetyltrimethylammonium bromide(CTAB)was used as a template agent during the preparation process of MCM-41.Then,calcium silicate hydrate(CSH)adsorbents were prepared using MCM-41 as template and silicon source.A series of characterization methods including XRD,FT-IR,SEM,XPS and TEM were carried out to analyze the microstructure of the CSH adsorbents before and after the adsorption of Ni2+.The influencing factors of hydrothermal time,adsorption reaction temperature,contact time,and pH value on the adsorption performance of CSH for Ni2+were systematically investigated,and the isotherm model,adsorption kinetics and adsorption thermodynamics of the adsorption process were analyzed.The results show that highly dispersed CSH with a thickness of only 3.8 nm can be obtained at the hydrothermal time of 12 h,and the elements of O,Si and Ca are uniformly distributed within CSH.The removal rate of Ni2+by CSH is 97.7%at an initial mass concentration of 250 mg/L within 8 h,and the maximum adsorption capacity can reach 496.72 mg/g.Moreover,the adsorption performance increases significantly with the increase of reaction temperature and solution pH value within a certain range.The adsorption of Ni2+by CSH is dominated by electrostatic attraction and ion exchange,and the adsorption process belongs to monolayer adsorption.The present work provides a cost-effective route for the utilization of fluorite tailings to prepare highly efficient CSH adsorbent towards Ni2+purification in industrial wastewater.关键词
萤石尾矿/介孔分子筛/碱熔/水热法/水化硅酸钙/吸附剂/镍离子Key words
fluorite tailings/mesoporous molecular sieves/alkaline fusion/hydrothermal method/calcium silicate hydrate/adsorption adsorbents/Ni2+分类
矿业与冶金引用本文复制引用
姚海睿,王先库,齐明洋,袁磊,周鹏飞,王菲..萤石尾矿制备水化硅酸钙及其对镍离子的吸附性能[J].矿产保护与利用,2025,45(6):62-72,11.基金项目
国家重点研发计划项目课题(2021YFC1910605) （2021YFC1910605）
中央引导地方科技发展资金项目(236Z4108G) （236Z4108G）
河北省自然科学基金项目(E2023202041) （E2023202041）
