不同条件下高炉渣吸附水中无机磷的研究

高炉渣(BFS)是在冶炼生铁过程中产生的固体废弃物,开展高炉渣的资源化研究具有重要意义.为了对水淬高炉渣净化含磷污水的应用提供理论依据,采取等温吸附的实验方法,比较了不同水淬炉渣的吸附磷效果,研究了不同pH和不同温度下水淬炉渣吸附磷的特点,结果如下:利用Langmuir等温吸附方程炉渣吸附磷的过程进行拟合,其相关系数均能达到显著水平.炉渣的碱度越高,吸附磷的效果越好;炉渣对磷的吸附能力随溶液pH的增加而降低,且初始为酸性(pH=2、4)的溶液在吸附达到平衡后pH有所上升,而初始为碱性的溶液(pH=10、12)在吸附达到平衡后pH有所下降;炉渣对磷的吸附是一个自发放热过程.

Adsorption of phosphate by blast furnace slag under different conditions

Blast furnace slag(BFS)is a by-product of steel industry. Research on the utilization of BFS is important. Factors that make a contribution to phosphate adsorption properties related to water quenching slag were investigated with experiments. Data acquired from the linear regression indicate that the sorption data all fit in well with Langmuir adsorption isotherms at a significant level of 0.5%, and the effect of adsorption is correlative with its component, the slag with higher alkalinity showed the higher capacity of P sorption.The adsorption capacity decreased with the increasing pH values in solution, also the final pH values increased in solutions with initial pH of 2,4,and it decreased in solutions of pH=10,12.The sorption process of P onto BFS surface carries on spontaneously, it is an exothermic process.