刘明宝,鱼博,强旭旭,樊兴,魏锐.水杨羟肟酸在钛铁矿表面的吸附特性研究[J].表面技术,2018,47(4):236-242.
LIU Ming-bao,YU Bo,QIANG Xu-xu,FAN Xing,WEI Rui.Adsorption Characteristics of Salicylhydroxamic Acid (SHA) on Ilmenite[J].Surface Technology,2018,47(4):236-242
水杨羟肟酸在钛铁矿表面的吸附特性研究
Adsorption Characteristics of Salicylhydroxamic Acid (SHA) on Ilmenite
投稿时间:2017-09-19  修订日期:2018-04-20
DOI:10.16490/j.cnki.issn.1001-3660.2018.04.035
中文关键词:  钛铁矿  水杨羟肟酸  表面吸附  吸附热力学  吸附动力学
英文关键词:ilmenite  salicylhydroxamic acid  surface adsorption  absorption thermodynamics  absorption kinetics
基金项目:陕西省自然科学基金(2016JQ5059);陕西省教育厅重点科研项目(16JS030)
作者单位
刘明宝 1.陕西省尾矿资源综合利用重点实验室,陕西 商洛 726000;2.商洛学院 化学工程与现代材料学院,陕西 商洛 726000 
鱼博 1.陕西省尾矿资源综合利用重点实验室,陕西 商洛 726000;2.商洛学院 化学工程与现代材料学院,陕西 商洛 726000 
强旭旭 1.陕西省尾矿资源综合利用重点实验室,陕西 商洛 726000;2.商洛学院 化学工程与现代材料学院,陕西 商洛 726000 
樊兴 1.陕西省尾矿资源综合利用重点实验室,陕西 商洛 726000;2.商洛学院 化学工程与现代材料学院,陕西 商洛 726000 
魏锐 1.陕西省尾矿资源综合利用重点实验室,陕西 商洛 726000;2.商洛学院 化学工程与现代材料学院,陕西 商洛 726000 
AuthorInstitution
LIU Ming-bao 1.Shaanxi Key Laboratory of Comprehensive Utilization of Tailings Resources, Shangluo 726000, China; 2.School of Chemical Engineering and Modern Material, Shangluo University, Shangluo 726000, China 
YU Bo 1.Shaanxi Key Laboratory of Comprehensive Utilization of Tailings Resources, Shangluo 726000, China; 2.School of Chemical Engineering and Modern Material, Shangluo University, Shangluo 726000, China 
QIANG Xu-xu 1.Shaanxi Key Laboratory of Comprehensive Utilization of Tailings Resources, Shangluo 726000, China; 2.School of Chemical Engineering and Modern Material, Shangluo University, Shangluo 726000, China 
FAN Xing 1.Shaanxi Key Laboratory of Comprehensive Utilization of Tailings Resources, Shangluo 726000, China; 2.School of Chemical Engineering and Modern Material, Shangluo University, Shangluo 726000, China 
WEI Rui 1.Shaanxi Key Laboratory of Comprehensive Utilization of Tailings Resources, Shangluo 726000, China; 2.School of Chemical Engineering and Modern Material, Shangluo University, Shangluo 726000, China 
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中文摘要:
      目的 从药剂吸附热力学和动力学角度揭示水杨羟肟酸在钛铁矿表面的作用特性。方法 采用水浴振荡法,通过改变矿浆pH、药剂浓度、矿浆温度并结合紫外-可见分光光度法,总结药剂在矿物表面的吸附规律。应用准一级、准二级及粒子扩散模型探索药剂吸附动力学特性,利用Langmuir、Freunlich模型和平均吸附能公式分析药剂吸附的热力学行为。结果 水杨羟肟酸离子在钛铁矿表面的吸附动力学符合准一级动力学方程。酸性及中性条件下,水杨羟肟酸离子在矿物表膜中的扩散是吸附过程的控制性步骤;而碱性条件下,矿物表面活性质点在矿物表膜中的扩散则是吸附过程的控制性步骤。低温下,药剂吸附符合Freunlich模型;温度升高时,吸附等温线遵守Langmuir单分子层吸附模型。吸附过程的ΔGϴ随温度上升而降低,但随药剂浓度的增加而增加。平均吸附能结果表明,药剂在温度低时属于离子交换吸附模式,但在温度升高时属于化学反应吸附模式。结论 水杨羟肟酸在钛铁矿表面的吸附规律受矿浆温度、pH及药剂浓度的影响较大,在生产实践中可通过改变上述条件来优化钛铁矿的浮选指标。
英文摘要:
      The work aims to reveal the adsorption characteristics of salicylhydroxamic acid (SHA) on ilmenite surface in terms of thermodynamic and kinetic properities in the adsorption process. The adsorption rule of reagent was summarized with water bath shaking method and ultraviolet-visible spectrophotometry by changing slurry pH, temperature and reagent concentration. Pseudo-first order model, pseudo-second order model and diffusion model were adopted to explore the kinetics of reagent adsorption. The reagent adsorption thermodynamics were analyzed by Langmuir, Freunlich and Mean-adsorption-energy. The absorption kinetics of SHA ions on ilmenite was in conformity with pseudo-first-order kinetic equation. The diffusion of SHA ions on mineral surface film was the control step in acidic and neutral conditions, while in alkaline condition, the diffusion of active particles of mineral surface on mineral film was the control step during absorption process. Reagent absorption accorded with Freunlich model at low temperature. As the temperature increased, the adsorption isotherm was in conformity with absorption model of Langmuir monomolecular layer. ΔGϴ during absorption decreased as the temperature increased, but increased as the reagent concentration improved. The reagent was proved to be ion-exchange absorption model at low temperature by mean adsorption energy but was chemical reaction adsorption model at high temperature. The adsorption rule of SHA on ilmenite surface was influenced greatly by the slurry pH、temperature and reagent concentration. The flotation index of ilmenite can be optimized by changing the conditions mentioned above in mill practice.
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