Influence of polyhydroxy saccharide binders on properties of Al2O3-SiC-C waterless taphole clay
To reduce the pollution of taphole clay and develop environment-friendly taphole clay,Al2O3-SiC-C waterless taphole clay was prepared using brown corundum,SiC,coke,sericite,kyanite,clay,and Si3N4-Fe powder as the main raw materials,NS-FH as the composite sintering aid,and environmentally friendly polyhydroxy saccharides glucose and sucrose as the binders.The effect of the extra addition of glucose or sucrose solution(0,8％,9％,10％,11％,12％and 13％,by mass)on the properties of Al2O3-SiC-C waterless taphole clay was studied.The results show that the Al2O3-SiC-C waterless taphole clay with good comprehensive properties can be prepared using polyhydroxy saccharides glucose or sucrose as the binder;when the addition of sucrose solution is 12％,the performance of the waterless taphole clay is the best,the Marshall value is 1.14 MPa,and the sample fired at 1 350 ℃ in an atmosphere with carbon embedded has the linear shrinkage rate of 0.72％,bulk density of 2.41 g·cm-3,apparent porosity of 24.4％,cold compressive strength of 40.1 MPa and hot modulus of rupture(embedded in carbon at 1 400 ℃ for 30 min)of 12.1 MPa.
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