轻质多孔陶粒的制备及其磷吸附性能研究

Research on Preparation of Light Porous Ceramsites and Their Phosphate Adsorption Properties

以粉煤灰、磷尾矿、石英尾矿为主要原料制备轻质多孔陶粒,用于处理模拟含磷废水,分别考察烧结过程与吸附试验中原料配比、煅烧温度、陶粒添加量、反应时间等对除磷效果的影响,并对陶粒成品吸附前后进行扫描电镜(SEM)与磷元素能谱分析。结果表明,在磷尾矿与粉煤灰质量比3∶7、烧结温度1050℃、保温时间30 min、升温速率10℃/min条件下,可制得堆密度为730 kg/m3的轻质粉煤灰复合陶粒;在初始模拟磷溶液质量浓度为10 mg/L,陶粒用量为5 g/400 mL条件下,吸附时间为4 h达到平衡,磷酸盐去除率为96.39%,模拟废水中余磷质量浓度低于0.5 mg/L。

Light porous ceramsite were prepared with fly ash,phosphorus tailings and quartz tailings as the main raw materials for the treatment of simulated phosphorus containing wastewater.The effects of raw material ratio,calcination temperature,addition amount of ceramisite and reaction time on phosphorus removal were investigated during sintering process and adsorption test.The ceramsite products before and after adsorption were analyzed by scanning electron microscope(SEM)and phosphorus surface scan analysis.The results show that under the mass ratio of phosphorus tailings to fly ash being 3∶7,sintering temperature being 1050℃,holding time being 30 min and heating rate being 10℃/min,lightweight fly ash composite ceramsite with bulk density of 730 kg/m^(3) can be prepared.Under the conditions of initial simulated phosphorus containing wastewater concentration being 10 mg/L,amount of ceramite particles being 5 g/400 mL and 4 h adsorption,the test equilibrium is reached,the phosphate removal rate is 96.39%and the residual phosphorus concentration in the simulated wastewater is less than 0.5 mg/L.