Synthesis of merlinoite from Chinese coal fly ashes and its potential utilization as slow release K-fertilizer
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- 作者：Jing Li ; Xinguo Zhuang ; Oriol Font ; Natalia Moreno ; V. Ramon Vallejo ; Xavier Querol ; Aurelio Tobias
- 关键词：Zeolite synthesis ; Chinese coal fly ash ; Merlinoite ; Slow-release K fertilizer ; Soil reclamation
- 刊名：Journal of Hazardous Materials
- 出版年：30 January, 2014
- 年：2014
- 卷：265
- 期：Complete
- 页码：242-252
- 全文大小：3271 K
文摘
This study focuses on the synthesis of merlinoite from Chinese coal fly ashes by KOH direct conversion method, with special emphasis on the application of synthetic merlinoite as fertilizer. These fly ashes were collected from two pulverized-coal combustion (PCC) power plants in Xinjiang, Northwest China. The synthesis results are influenced by fly ash characteristics and different synthesis conditions (KOH solution concentrations, activation temperature, time, and KOH/fly ash ratios). A high quality merlinoite-rich product was synthesized under optimal activation conditions (KOH concentration of 5 M, activation temperature of 150 掳C, activation time of 8 h and KOH/fly ash ratio of 2 l/kg), with a cation exchange capacity (CEC) of 160 cmol kg鈭?. The synthetic merlinoite is proved to be an efficient slow release K-fertilizer for plant growth, indicating that it can be widely used for high-nutrient demanding crops growing in nutrient-limited soils and for large-area poor soil amendment in opencast coal mine areas around the power plants that will substantially grow with the increasing coal combustion in Xinjiang in the near future.