本文關(guān)鍵詞： 粉煤灰 復(fù)合改性 尾礦 鋅　出處：《環(huán)境工程學(xué)報》2016年09期 　論文類型：期刊論文

【摘要】：以粉煤灰為基質(zhì)、十六烷基三甲基溴化銨和NH4Cl為改性劑,通過濕法制備了復(fù)合改性粉煤灰,研究了改性粉煤灰對模擬和實(shí)際尾礦浸出液中Zn的吸附效果。通過單因素實(shí)驗(yàn)優(yōu)化了改性粉煤灰去除模擬和實(shí)際尾礦浸出液中Zn的條件,用Langmuir方程和Freundlich方程較好的擬合了改性粉煤灰的等溫吸附實(shí)驗(yàn)數(shù)據(jù)。改性粉煤灰的飽和吸附量為17.39 mg·g-1,在模擬和實(shí)際尾礦浸出液中,改性粉煤灰對Zn的去除率分別為96.8%和91.9%,與原粉煤灰相比均有顯著增加。對于實(shí)際尾礦浸出液,通過正交實(shí)驗(yàn)優(yōu)化的改性粉煤灰的最佳使用條件是:投加量2.5 g·(50 g)-1尾礦,反應(yīng)溫度25℃,p H≥4.0。模擬酸雨實(shí)驗(yàn)的結(jié)果表明改性粉煤灰適合在酸雨頻發(fā)的地區(qū)使用。
[Abstract]:Using fly ash as matrix, cetyltrimethylammonium bromide and NH4Cl as modifiers, composite modified fly ash was prepared by wet method. The adsorption effect of modified fly ash on Zn in simulated and actual tailings leachate was studied. The conditions for removal of Zn from simulated and actual tailings leachate by modified fly ash were optimized by single factor experiment. The experimental data of isothermal adsorption of modified fly ash were well fitted by Langmuir equation and Freundlich equation. The saturated adsorption capacity of modified fly ash was 17.39 mg 路g ~ (-1). The removal rates of Zn by modified fly ash are 96.8% and 91.9, respectively, which are significantly higher than those of the original fly ash. For the leaching solution of actual tailings, the optimum operating conditions of modified fly ash by orthogonal experiment are as follows: the dosage of modified fly ash is 2.5 g 路L ~ (50) g ~ (-1) tailings. The reaction temperature is 25 鈩，

本文編號：1546605