Foam materials preparation of coarse slag from coal-water slurry gasification and its absorption properties
The foaming and bonding phenomenon occurs in the coarse slag particles of coal water slurry gasification after high temperature roasting,which provides a basis for the preparation of foam materials.Single variable method is used to explore the effects of slag amount,roasting temperature and holding time on the compressive strength and volume density of foam materials,using Ningdong four nozzle coal water slurry gasification slag as raw material.The results show that,under the conditions of 1.25～5 mm coarse slag particle size,14 g coarse slag amount(fixed volume mold),N2 roasting atmosphere,750℃roasting temperature and 10 min holding time,the compressive strength of the prepared foam material exceeds 1.5 MPa,and the volume density is within 0.5 g/cm3.The electromagnetic wave absorption performance of the material is as follows:when the material thickness is 7 mm,the minimum reflectance loss value is-22.14 dB(16.80 GHz),and the effective bandwidth is 1.88 GHz.Its absorption of electromagnetic waves is mainly reflected in the 16～18 GHz frequency band,and the absorption loss mechanism is mainly the magnetic loss effect of ferrite in the gasification slag.It can provide new ideas for the preparation of foam materials and the application of foam materials in the field of electromagnetic wave absorption.
coarse slag from coal water slurry gasificationfoaminglightweightmoldingelectromagnetic wave
NETL
NSTL
万方数据
