含氧化铝类废催化剂利用研究

Study on Utilization of Waste Catalysts Containing Alumina

含氧化铝类的废催化剂的危险废物热值低,灰分大,直接焚烧处理成本高,若是将其中的氧化铝转化为三氯化铝进行利用,进行PAC的生产,具有较大的社会和经济效益。研究了不同的废氧化铝催化剂的粒径及不同的Al_(2)O_(3)与HCl的摩尔比的废氧化铝催化剂中氧化铝的溶出效率、溶出的氧化铝能否制造合格的PAC成品及溶出氧化铝后的滤渣中和后能否直接填埋。实验表明:当粒径≤250目时,氧化铝的溶出率为95.85%;当该废催化剂Al_(2)O_(3)与盐酸的摩尔比为1∶1.2时溶出效率为96.25%;溶出的氧化铝可以生产PAC,且生产出的PAC符GB/T 22627—2022《水处理剂聚氯化铝》标准;滤渣经中和后符合GB 18598-2019 《危险废物填埋污染控制标准》,可以直接进行填埋。

The hazardous waste of waste catalysts containing alumina has low calorific value,large ash content and high cost of direct incineration.If the alumina is converted into aluminum trichloride for utilization and PAC production,it will have great social and economic benefits.This paper mainly studies the alumina dissolution efficiency of the waste alumina catalyst which affects the particle size of different waste alumina catalyst and the molar ratio of Al_(2)O_(3) to HCl,whether the dissolved alumina can be manufactured qualified PAC products and whether the filter slag after the dissolved alumina can be directly buried after neutralization.The results show that the dissolution rate of alumina is 95.85%when the particle size is less than 250 mesh.When the molar ratio of Al_(2)O_(3) to hydrochloric acid is 1∶1.2,the dissolution efficiency is 96.25%.The dissolved alumina can produce PAC,and the produced PAC standard GB/T22627-2022<Water treatment chemicals-polyaluminium chloride>;After neutralization,the filter slag also conforms to GB 18598-2019<Standard for pollution control on the hazardous waste landfill>and can be directly landfill.