期刊论文

中文

中国农业科学

0578-1752

2005

38

2

341-349

10.3321/j.issn:0578-1752.2005.02.020

国家农业科技成果转化资金项目（02EFN214300453）； 2001年湖南省科技厅资助项目（01SSY2003-2）；

本校为第一机构

对采自湖南省的几种粉煤灰特性及其硅、磷农业化学行为的研究结果表明,粉煤灰颗粒组成以砂粒(1～0.05 mm)和粗粉粒(0.05～0.01 mm)为主,平均分别占34.37 % 和38.56 %.容重较小,仅为土壤的1/2~1/3,除采自长沙电厂的粉煤灰外,pH一般大于10.0,可以用作粘质酸性土壤改良剂.粉煤灰水溶性硅和有效硅含量与土壤相差不明显,不能把粉煤灰直接作硅肥使用.粉煤灰的全钾含量和土壤大致相同,但其游离态铁比土壤低3 ~ 4倍.粉煤灰中硅的释放量随时间变化的关系可以用Elovich方程和Freundlich方程进行较好的描述,其相应的参数b和k反映了硅的释放能力,b、k值越大,硅释放能力越强.不同来源粉煤灰的b、k值不同,其大...

The physical and chemical properties and silicon releasing pattern and phosphate adsorption-desorption of fly ashes derived from six power stations in Hunan province were studied. The results showed that fly ashes could be used as soil amendments because the fly ashes were mostly composed by sand(1-0.05 mm)and coarse silt particle(0.05-0.01mm)accounting for 16.13 %- 85.68 % and 13.03 %-49.64 %, respectively. The bulk density of fly ashes was 2- to 3-fold lower than that of soils. The fly ashes generally have high alkalinity (pH 10.3-12.1, 1︰2....