生活垃圾焚烧灰-玻璃粉陶粒烧胀过程及性能研究

Study on sintering expansion process and performance of waste incineration ash-glass powder ceramsite

目前,城市生活垃圾处理主要有填埋、堆肥和焚烧等方法。文章研究了70%垃圾灰、10%玻璃粉、8%盐渍土、6%Na_2CO_3和6%CaCO_3的生活垃圾焚烧灰-玻璃粉陶粒焙烧工艺及性能。结果表明,垃圾灰-玻璃粉陶粒的最佳工艺为焙烧温度1140℃,焙烧时间15 min,陶粒吸水率为2.94%、颗粒密度为1.176 g/cm^3、堆积密度为0.742 g/cm^3和筒压强度为6.5 MPa。陶粒烧胀原因是由碳酸盐高温分解反应产生的CO_2引起的;陶粒增强原因是其中生成了主晶相石英(SiO_2)、不同长石(KAl Si3O8、NaCaAl(SiAl)_2O_8、CaAl_2Si_2O_8)和玻璃相,长石在玻璃相中析晶起到增强相的作用。增加焚烧灰含量将使氧化铝和长石数量减少,并导致陶粒强度降低。

At present, the main treatment methods of municipal waste are landfill, composting and burning. This paper studies the properties and calcination process of ceramsite containing with 70% incineration ash, 10% glass powder, 8% saline soil, 6%Na2CO3 and 6% CaCO3. The results show that the optimum process conditions of ceramsite are the calcination temperature 1 140 ℃ and roasting time 15 min, which properties can obtain water absorption rate 2.94% particle density 1.17 6g/cm3, bulk density 0.742 g/cm3 and the cylinder compressive strength 6.5 MPa. The burning expansion of ceramsite is caused by CO2 from carbonate decomposition reaction at high temperature. The reason for increasing strength of eeramsite is the formation of main crystal phase quartz （SiO2）, different feldspars （KAlSi3O3, NaCaAl （SiAl） 208, CaAl2Si2O8） and the glass phase. Feldspar plays the role of strengthening phase. Increasing of the content of incineration ash can reduce the amount of alumina and feldspar, meanwhile the strength of ceramsite is decreased.