Effect of sodium carboxymethyl cellulose addition on properties of MgAl2O4 porous insulation materials
This work aims at improving the energy utilization efficiency of kilns.Magnesium aluminate spinel porous insulation materials were prepared as follows.Medium-grade magnesia fine powder and calcined alumina powder were mixed in a mass ratio of 35:65,dried,and crushed into powders of d50=2.3 μm.Then different amounts of sodium carboxymethyl cellulose(CMC)as a foam stabilizer and 0.6 mass％potassi-um oleate as a foaming agent were added to obtain the foaming slurry.Finally the slurry was injected into molds of 40 mm×40 mm×40 mm,demolded,dried at 110 ℃ for 24 h,and fired at 1 500 ℃ for 3 h.The effects of the CMC addition(0,0.1％,0.2％,0.3％,0.4％,and 0.5％,by mass,extra adding)on the prop-erties of the slurry and the fired samples were studied.The results show that:(1)when the CMC addition is higher than 0.1％,the slurry has decreased expansion ratio,increased viscosity,and less and smaller bub-bles;(2)when the CMC addition is 0.2％,the slurry has the maximum Zeta potential absolute value of 18.3 mV,which is the most stable;the sample has the most pores,which are spherical and closed;the ap-parent porosity,bulk density,and cold compressive strength of the sample are 73.5％,0.95 g·cm-3,and 13.1 MPa.
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