水化硅酸钙的制备及磷回收性能表征  

Preparation and phosphorus recovery performance of calcium silicate hydrate

作　　者：关伟[1] 吉芳英[1] 陈晴空[1] 晏鹏[1] 张千[1] 

机构地区：[1]重庆大学三峡库区生态环境教育部重点实验室,重庆400045

出　　处：《功能材料》2012年第23期3286-3290,共5页Journal of Functional Materials

基　　金：国家水体污染控制与治理重大科技专项资助项目(2009ZX07315);重庆市重大科技专项资助项目(2008AB7133)

摘　　要：以电石渣和白碳黑分别作为钙质和硅质原料,采用水热法制备具有磷回收特性的水化硅酸钙。研究了制备条件对水化硅酸钙磷回收性能的影响,采用XRD揭示了水化硅酸钙的磷回收机制。通过BET、SEM表征了水化硅酸钙的微观结构,考察了水化硅酸钙的溶钙供碱能力。钙硅摩尔比为1.6∶1,水热反应温度为170℃,水热反应时间为4.5h,搅拌强度为90r/min的条件下所制备的水化硅酸钙,其磷回收产品中的磷含量达到18.64%。该材料具有多孔结构,比表面积达到113.3572m2/g,能够溶出的Ca2+浓度为3.52mg/g,这些溶钙供碱特性使得该材料能够在pH值=9.0的环境下以羟基磷酸钙的形式从污水中回收磷。Calcium silicate hydrate with phosphorus recovery efficiency was synthesized by carbide residue and silica. Effect of prepared method on phosphorus recovery efficiency of calcium silicate hydrate was studied. Mechanism of phosphorus recovery was revealed by XRD. Microstructure of calcium silicate hydrate was characterized by BET and SEM. Capacity of Ca^2＋ and OH release was investigated. The considerable preparation conditions are obtained on the condition of Ca/Si molar ratio 1.6 - 1, reaction temperature 170℃, reaction time 4.5h, stirring intensity 90r/min. Phosphorus content of product of phosphorus recovery reached 18.64. The prepared calcium silicate hydrate has a high BET surface area 113. 3572m^2/g with porous structure. Concentration of Ca^2＋ release reached 3.52mg/g. This material could recover phosphorus from wastewater in the form of hydroxyl calcium phosphate on the condition of pH=9.

关 键 词：磷回收 水化硅酸钙 羟基磷酸钙 制备 

分 类 号：X5[环境科学与工程—环境工程] TB3[一般工业技术—材料科学与工程]