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摘要:
通过对粉煤灰改性，研究改性粉煤灰对磷矿浮选药剂十二烷基硫酸钠的吸附性能，为磷矿浮选废水中有机药剂的去除提供依据。采用X射线衍射仪分析粉煤灰焙烧前后的成分，扫描电镜观察改性前后表面形貌，粉煤灰在350℃焙烧后形成更多的孔道。改性后的粉煤灰吸附十二烷基硫酸钠，进行用量、pH、温度和时间的吸附试验。采用准一级动力学模型、准二级动力学模型、Bangham孔道扩散模型和Weber and Morris（W-M）动力学模型进行吸附动力学分析，可知该吸附符合准二级动力学和W-M动力学模型。采用Langmuir和Freundlich等温模型对吸附等温线进行分析，可知粉煤灰表面具有不均匀性，该吸附属于优惠吸附。
Abstract:The adsorption performance of modified fly ash on sodium dodecyl sulfate which is a flotation reagent for phosphate rock was studied. It could provide a basis for the removal of organic reagents from phosphate ore floatation wastewater. The chemical composition of fly ash before and after calcination was analyzed by X-ray diffractometer. The surface morphology of fly ash before and after modification was observed by scanning electron microscope. It was found that more pores were formed after roasting of fly ash in 350℃. Sodium dodecyl sulfate was adsorbed by modified fly ash, and the adsorptive experiments of dosage, pH, temperature and time were carried out. Pseudo-first-order dynamic model, pseudo-second-order dynamic model, Bangham pore diffusion model and Weber and Morris (W-M) dynamic model were used to analyze the adsorption kinetics. It was found that the adsorption conformed to the pseudo-second-order dynamic model and the W-M dynamic model. And the adsorption isotherms were analyzed by Langmuir and Freundlich isothermal models. It was found that the surface of fly ash was inhomogeneous, and the adsorption was a preferential adsorption.
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Key words:
- modified fly ash /
- adsorption /
- waste water /
- sodium dodecyl sulfate
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表 1 粉煤灰焙烧后的粒级分布
Table 1. Particle size distribution after roasting of fly ash
粒级/mm +0.075 -0.075+0.061 -0.061+0.048 -0.048+0.040 -0.040 含量/% 16.29 5.40 13.11 11.92 53.28 
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