兰炭基活性炭的制备及其在处理提金废水中的应用
发布时间：2019-01-07 19:48
【摘要】：本文以陕北榆林地区生产的兰炭为原料,KOH为活化剂制备活性炭,并将其应用于提金氰化废水的综合处理中,为含氰废水的综合利用开辟了一条新途径。兰炭基活性炭的制备重点研究了碱炭混合方式、粒度、碱炭比、活化温度以及活化时间对活性炭收率、碘吸附值的影响,利用扫描式电子显微镜(SEM)、傅里叶变换红外光谱(FT-IR)、X射线衍射(XRD)等对活性炭进行分析表征。结果表明,随着原料粒度的减小,收率不断降低,碘吸附值不断提高;碱炭比范围为0.25:1~1.5:1时,碱炭比越大,收率越低,碘吸附值越大;随活化温度的升高和活化时间的延长,收率不断降低,碘吸附值呈先增大后减小的趋势。当粒度为0.6~0.3mm(28~48目)、碱炭比为1.5:1、活化温度为800℃、恒温时间为2h时,活性炭的收率为66.7%,碘吸附值可达到803.277mg·g-1。活性炭表面含有大量的羧基、羟基、羰基及醚键等官能团。氰化提金废水的吸附实验主要探讨了活性炭投加量、吸附时间、吸附温度及pH对废水处理结果的影响。研究表明,将兰炭基活性炭应用于提金废水的处理是可行的。废水中各离子去除率,随活性炭投加量的增加而增大,随吸附温度的升高而减小,随吸附时间的延长而增大,随pH的增大而减小。当活性炭投加量为5g/100ml,常温下搅拌吸附2h时,Cu、Zn、CN-及总氰离子的去除率分别可达到100%、93.51%、71.52%、90.96%。动力学研究表明,Zn离子的吸附行为符合二级动力学模型,其吸附量达353.357mg·g-1;速率常数k=5.6×10-3,吸附速率很快;热力学研究表明,Zn离子的吸附行为符合Freundlich等温模型,Freundlich指数n1,表明Zn离子与活性炭的亲和力强,热力学参数ΔG00,ΔH00,ΔS00,表明该吸附是一个自发的、放热的、从无序状态到有序状态转变的过程。
[Abstract]:In this paper, active carbon was prepared from orchid charcoal produced in Yulin area of northern Shaanxi Province and KOH was used as activator. It was applied to the comprehensive treatment of cyanide wastewater from gold extraction, which opened a new way for comprehensive utilization of cyanide containing wastewater. The preparation of blue carbon based activated carbon was focused on the effects of mixing mode, particle size, ratio of alkali to carbon, activation temperature and activation time on the yield and iodine adsorption value of activated carbon. (SEM), was used as scanning electron microscope (SEM). The active carbon was characterized by Fourier transform infrared spectroscopy (FT-IR), X ray diffraction (XRD) et al.). The results show that with the decrease of raw material size, the yield decreases and the iodine adsorption value increases, and when the ratio of alkali to carbon is 0.25: 1: 1.5: 1, the higher the ratio of alkali to carbon is, the lower the yield is and the higher the iodine adsorption value is. With the increase of activation temperature and the prolongation of activation time, the yield of iodine decreases and the adsorption value of iodine increases first and then decreases. When the particle size is 0.6~0.3mm (28 ~ 48 mesh), the ratio of alkali to carbon is 1.5: 1, the activation temperature is 800 鈩，
本文编号：2404075
[Abstract]:In this paper, active carbon was prepared from orchid charcoal produced in Yulin area of northern Shaanxi Province and KOH was used as activator. It was applied to the comprehensive treatment of cyanide wastewater from gold extraction, which opened a new way for comprehensive utilization of cyanide containing wastewater. The preparation of blue carbon based activated carbon was focused on the effects of mixing mode, particle size, ratio of alkali to carbon, activation temperature and activation time on the yield and iodine adsorption value of activated carbon. (SEM), was used as scanning electron microscope (SEM). The active carbon was characterized by Fourier transform infrared spectroscopy (FT-IR), X ray diffraction (XRD) et al.). The results show that with the decrease of raw material size, the yield decreases and the iodine adsorption value increases, and when the ratio of alkali to carbon is 0.25: 1: 1.5: 1, the higher the ratio of alkali to carbon is, the lower the yield is and the higher the iodine adsorption value is. With the increase of activation temperature and the prolongation of activation time, the yield of iodine decreases and the adsorption value of iodine increases first and then decreases. When the particle size is 0.6~0.3mm (28 ~ 48 mesh), the ratio of alkali to carbon is 1.5: 1, the activation temperature is 800 鈩，
本文编号：2404075
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