Study on the Migration,Transformation and Adsorption Characteristics of Phosphogypsum Leachate Phosphorus in Red Clay
In order to explore the migration,transformation and occurrence status of phosphorus in phosphogypsum leachate in soil,this article uses a phosphogypsum storage yard in Guizhou as the research area,and uses indoor physical simulation experiments and soil adsorption experiments to analyze the migration and transformation characteristics of phosphorus in phos-phogypsum leachate in red clay and explore the causes of phosphorus adsorption by red clay.The results show that different phosphogypsum thicknesses and red clay thicknesses have a significant impact on the migration of phosphorus in the phospho-gypsum leachate.The greater the thickness of phosphogypsum,the greater the concentration of phosphorus in the leachate,and the greater the thickness of the red clay soil layer,the lower the concentration of phosphorus in the leachate.During the migration and transformation process of phosphorus in the phosphogypsum leachate in the red clay layer,its various forms are constantly changing,and some of them will be adsorbed by the red clay,so that the phosphorus concentration will decrease accordingly.The main forms are top dissolved phosphorus and soluble reactive phosphorus,accounting for about 80％～94％and 80％～95％respectively.soluble un-reaetive phesphorus and particulotte phosphorus have smaller contents,accounting for about 5％～20％and 5％～16％respectively.The maximum adsorption capacity of red clay for phosphorus in phosphogypsum leachate is 0.23 mg/g.Moreover,the adsorption isotherm curve of red clay for phosphorus is more consistent with the Freun-dlich equation,with a correlation coefficient R2 of 0.986 78,and the adsorption process is more consistent with the pseudo-sec-ond-order kinetic model,with a correlation coefficient R2 of 0.964 14.
phosphogypsum leachatered claymigration and transformationadsorption capacityadsorption isotherm curvekinetic model
万方数据
维普
