摘要:
Porous ceramics were prepared from kaolinite gangue and Al(OH)
3 with double addition of MgCO
3 and CaCO
3 by the pore-forming
in-situ technique. The characterizations of porous ceramics were investigated by X-ray diffractometry, scanning electron microscopy, and mercury porosimetry measurements,
etc. It is found that although the decomposition of MgCO
3 and CaCO
3 has little contribution to the porosity, the double addition of MgCO
3 and CaCO
3 strongly affects the formation of liquid phase, and then changes the phase compositions, pore characterization, and strength. The appropriate mode is the sample containing 1.17wt% MgCO
3 and 1.17wt% CaCO
3, which has high apparent porosity (41.0%), high crushing strength (53.5 MPa), high mullite content (76wt%), and small average pore size (3.24 μm).