城市污泥掺量对煤气化渣陶粒性能影响

Influence of Municipal Sludge Dosage on Performance of Coal Gasification Slag Ceramsite

以煤气化渣为主要原材料烧制陶粒,研究了陶粒的烧结制度以及城市污泥掺量对陶粒性能、孔结构影响及微观作用机制。结果表明:陶粒烧结制度为500℃预热30 min,1100℃烧结15 min时,煤气化渣陶粒强度可达11.3 MPa,且烧结出污泥质量掺量为20%、筒压强度为6.7 MPa的轻质高强陶粒;城市污泥掺量改变了陶粒孔结构和孔径分布,陶粒孔隙率及平均孔径随着污泥掺量的增加而增大,陶粒内部结构变得疏松,使得陶粒吸水率增加、堆积密度减小,且对陶粒强度带来不利影响。

The coal gasification slag was used as the main material to sinter ceramsite,and the sintering system of ceramsite was studied.In addition,the influence of municipal sludge dosage on the basic properties,pore structure and microscopic mechanism of ceramsite were studied.The results show that the strength of coal gasification slag ceramsite is reached to 11.3 MPa when the preheating temperature 500℃for 30 min and sintering temperature 1100℃for 15 min.The compressive strength of ceramsite is greater than 6.5 MPa when the municipal mass content is 20%in this sintering system.Besides,the porosity and average pore diameter of ceramsite increase with the increase of sludge content,and the internal structure of ceramsite became loose,which increases the water absorption rate,reduces the apparent density,and adversely affects the strength of the ceramsite.