为进一步促进城市渣土资源化利用,本文研制了800密度等级,粒径不同(10~15 mm,15~25 mm)的渣土陶粒.探究了原料配方、烧制工艺对渣土陶粒性能的影响规律,同时采用超景深光学显微镜和扫描电镜对渣土陶粒的微观结构进行了分析.研究结果表明:(1)渣土:粉煤灰质量配比为75∶25时,预热温度500 ℃,预热时间20 min,焙烧时间15 min,焙烧温度1190 ℃下,可制备出不同粒径(10~15 mm,15~25 mm)的800密度等级渣土陶粒;(2)15~25 mm粒径的渣土陶粒,筒压强度为4.6 MPa,堆积密度729 kg/m3,表观密度1329 kg/m3,1 h吸水率为1.7%,烧失量1.4%;10~15 mm粒径的渣土陶粒,筒压强度为5.2 MPa,堆积密度760 kg/m3,表观密度1483 kg/m3,1 h吸水率为1.6%,烧失量1.4%;(3)不同粒径下的渣土陶粒微观结构均比较疏松,其中小粒径渣土陶粒内部结构相比大粒径较疏松,孔隙较多,孔径较大.
In order to further promote the utilization of municipal wastes, this paper developed a new type of ceramic powder with different density (10-15 mm, 15-25 mm).The effects of raw material formula and firing process on the properties of the ceramic particles were investigated.The microstructure of the ceramiste particles was analyzed by the ultra-depth optical microscope and scanning electron microscope.The results show that: When the mass ratio of fly ash to fly ash is 75∶25, the preheating temperature is 500 ℃, the preheating time is 20 min, the calcination time is 15 min and the calcination temperature is 1190 ℃.10-15 mm, 15-25 mm);Macroscopic properties: 15-25 mm particle size of the dregs of ceramic, cylinder pressure intensity of 4.6 MPa, bulk density 729 kg/m3, the apparent density 1329 kg/m3, 1 h water absorption rate of 1.7%, loss on ignition of 1.4%;10-15 mm particle size of the clay ceramic, cylinder pressure of 5.2 MPa, bulk density 760 kg/m3, apparent density 1483 kg/m3, (1.6%) and loss on ignition (1.4%).The microstructures of slag soils under different grain sizes were relatively loose.The internal structure of the small particle size ceramic is more loose than the large particle size, pore size is larger.
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