地聚物材料固化含砷废渣抗冻融性能研究

Frost Resistance of the Arsenic Containing Waste Solidified Form with Geopolymer

为了处理有色金属冶炼厂产生的含砷废渣,利用磷渣-粉煤灰基地聚物材料对其进行固化处理,对固化体抗冻融性能进行研究,考察不同冻融方式、冻融循环次数等条件下固化体的相对质量变化、抗压强度、砷浸出率特性,并采用XRD、SEM等表征手段分析冻融前后固化体的物相组成及形貌变化。结果表明:采用不同的冻融方式,随着冻融循环次数的增加,固化体的相对质量变化不大;抗压强度有所下降,经15次冻融循环,强度仍可高于15 MPa,固化体砷浸出率呈上升趋势,砷浸出率仅为0.27%。XRD及SEM分析表明,冻融前后固化体中矿物相基本未发生变化以及固化体未发生崩裂现象,说明固化体具有较强的抗冻融性能。

A geopolymer based on phosphorous slag and fly ash was waste residue discharged from a nonferrous metallurgical plant used to solidify the arsenic-containing The resistance to freeze-thaw of the solidified forms was researched and the change of mass, compressive strength and arsenic leaching ratio under different thawing methods and different freeze-thaw cycles were investigated. Meanwhile, the morphology and phase compositions of solidified form were analyzed by means of X-ray diffraction （XRD） and Scanning electron microscopy （SEM）. The results show that the mass of the solidified form changed little and the compressive strength decrease, but it still higher than 15 MPa after 15 frezzing-thawing cycles. The arsenic leaching ratio increase, but the arsenic leaching ratio only reach to 0.27% after 15 freezzing-thawing cycles. It is showed by XRD and SEM that the mineral phase in the solidified form have not changed basically and no fragmentation existed after freeze-thaw cycles. This show that the solidified form has stronger freeze-thaw resistance.