关键词: 煤气化渣, 烧结制品, 正交表, 烧成制度

Abstract:

Sintered products were prepared using coal gasification slag as the main raw material.Based on the comprehensive differential thermal analysis of dry mixture and the firing shrinkage pre-tests of green bodies as well as experience,the experiment was conducted according to orthogonal table L₉(3 ³),selecting the heating rate,the firing temperature,and the holding time as factors,2,3,and 4 ℃·min ^-1,1 100,1 150,and 1 200 ℃ as well as 2,4,and 6 h as the corresponding levels,while the bulk density,the water absorption,the compressive strength and the thermal conductivity as evaluation indexes.The results show that:(1)the order of the influence degree of the firing system factors on the compressive strength,the bulk density and the water absorption of the sintered products is the firing temperature>the holding time>the heating rate,and that for the thermal conductivity is the firing temperature>the heating rate>the holding time;(2)generally,the optimal firing system is the heating rate of 2 ℃·min ^-1,the firing temperature of 1 200 ℃,and the holding time of 6 h,and the prepared sample has the bulk density of 1.84 g·cm ^-3,the compressive strength of 112 MPa,the water absorption of 1.44%,and the thermal conductivity of 1.239 W·m ^-1·K ^-1.

Key words: coal gasification slag, sintered products, orthogonal table, firing system