膨脹石墨的制備及其對捕收劑吸附研究
[Abstract]:Expandable graphite (EG) is obtained by oxidation intercalation of natural flake graphite by chemical or electrochemical methods, and (GIC), expandable graphite is calcined at high temperature, which is caused by the instantaneous driving force produced by the intercalation between graphite layers. A worm-like graphite expander with network pores is obtained by increasing the volume by several dozen to several hundred times. Exfoliated graphite is widely used in many industries because of its excellent properties, and it is called the most promising new material in the 21 ~ (st) century. There are a large number of flotation reagents in flotation wastewater, the treatment process is complex, the economic benefit is not good, the direct discharge is not good, and it is harmful to the environment and does not meet the requirements of green mines. At present, expandable graphite is used to adsorb oil more and more, and adsorption of other pharmaceutical pollutants is paid more and more attention. However, the study of modified expanded graphite used for adsorbing collector in mineral processing wastewater has not been reported. In this paper, expanded graphite was prepared with hydrogen peroxide, sulfuric acid and ammonium nitrate as oxidizing agent. The optimum expansion volume of 255mL/g expanded graphite was obtained by controlling the condition of single variable. At the same time, the expanded graphite was characterized by scanning electron microscope, and the pore structure of expanded graphite was deeply understood. The modified expanded graphite (MEG).) was obtained by the experiment of ferric chloride modification under the best technological conditions. On this basis, the adsorption of the modified expanded graphite on the flotation collector benzohydroxamic acid (GYB) and xanthate was studied. The adsorption test results showed that the adsorption equilibrium time of modified expanded graphite to GYB was 5.5 h and the maximum adsorption capacity was 16.31 mg / g GYB. The adsorption equilibrium time of xanthate was 60 min, the maximum adsorption capacity was 18.87 mg / g, and the removal rate of xanthate was 94.24 mg / g. The adsorption kinetics of expanded graphite for benzohydroxamic acid and xanthate was studied by pseudo-first-order reaction model and pseudo-second-order reaction model, respectively. The results show that the pseudo-second-order reaction model is more suitable to describe the adsorption process of expanded graphite to the reagent. In addition, the adsorption thermodynamics showed that the adsorption of benzyl hydroxamic acid by expanded graphite was in accordance with the Freundlich adsorption model, and the adsorption of xanthate with Langmuir adsorption model.
【學(xué)位授予單位】:昆明理工大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:TQ424.2;TD923.13
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