Preparation Of Glass-Ceramics And Chase Transfer Properties Of F-Containing Aluminum Dross

In this paper,the secondary aluminum dross produced from the refining process of an aluminium manufacturer in Gansu and water-washing dross were used as raw materials mixed with different reagents includes MgO,CaO,SiO2 and TiO2 to produce glass-ceramic by melting method.The main crystallization phase of samples was anorthite.The effect of aluminum dross on the crystallization behavior,microstructure and performance of the glass-ceramics were investigated.First,based on the analysis of aluminum dross composition,a series of basic glass formulas were designed by using the original aluminum dross as the main raw material.After melting at 1600? for 2 hours,the temperature dropped to 1550? melted for another 1 hour in order to obtain the base glass sample.After heat treatment process the aluminum dross glass-ceramics were prepared,and the effect of dross content on the properties of glass ceramics was investigated.The results showed that the glass transition temperature Tg of the five basic glass samples was in the range of 725?746 ?,and the initial temperature of crystallization Tx was in the range of 846?872?.Thus,780? was chosen as the nucleation temperature while 880? was selected as the ideal crystallization heat treatment temperature.The main crystalline phase of the glass-ceramic was anorthite and the secondary phase was wollastonite.When the aluminum dross content was 65 g,a small amount of diopside has separated out.The hardness of samples showed an increasing trend with increase of aluminum dross content.The minimum hardness was 6.70 GPa when aluminum dross content was 45 g,while the maximum hardness is 8.04 GPa at 65g.The density of the samples increased at the beginning of experiment while decreased afterwards.When aluminum dross content was 45 g,the highest density was 3.25 g/cm3,while the lowest density was 2.89 g/cm3 when the dross content was 25 g.The five groups of samples showed outstanding acid and alkali corrosion resistance,the acid corrosion resistance of samples decreased as the aluminum dross was increasing,while the alkali corrosion decreased,and it was stronger than the acid resistance of the samples.After that,a series of basic glass formulas were designed with water-washing dross as the main raw material.After melting at 1600? for 2 hours,the temperature dropped to 1550? melted for another 1 hour in order to obtain the base glass sample.After heat treatment process the aluminum dross glass-ceramics were prepared,and the effect of dross content on the properties of glass ceramics was investigated.The results showed that the glass transition temperature Tg of the five basic glass samples was in the range of 741?751?,and the initial temperature of crystallization Tx was in the range of 845?879?.Therefore,the same heat treatment system was selected.The main crystalline phase of the glass-ceramic was still anorthite and the secondary phase was changed to olivine.When the aluminum ash content was 65 g,a small amount of spinel has separated out.The hardness and density of the samples showed an increasing trend with increase of aluminum dross content.When the aluminun dross content was 25 g,the minimum hardness and density were 7.27 GPa and 2.82g/cm3 respectively.While,the maximum hardness and density were 8.57 GPa and 2.31 g/cm3 respectively when the amount of dross used was 65 g.After the aluminum dross had been washed,there was no effect on the acid and alkali corrosion resistance of the samples.Samples showed outstanding acid and alkali corrosion resistance,the acid corrosion resistance of samples decreased as the aluminum dross was increasing,while the alkali corrosion decreased,and it was stronger than the acid resistance of the samples.