Abstracts Selected from Naihuo Cailiao(Refractories)--A Bimonthly in Chinese  

出　　处：《China's Refractories》2022年第2期51-54,共4页中国耐火材料（英文版）

摘　　要：Preparation of magnesium hydroxide sulfate/magnesium hydroxide modified expanded graphite by hydrothermal method/Duan Hongjuan,Cai Weijie,Zhang Hao,Li Faliang,Zhang Haijun//Naihuo Cailiao.-2021,55(6):461 Abstract:This work aims at improving the oxidation resistance and dispersion of expanded graphite for low carbon refractories.Expanded graphite was modified by the hydrothermal method using MgS04,NH40H and surfactants:sodium dodecyl benzene sulfonate(SDBS),polyethylene glycol(PEG),and sodium polyacrylate(PAAS)as starting materials.The effects of the NH4OH addition(NH4OH and MgSO4 mole ratios of 3:1,2:1 and 1:1)and surfactants on the phase composition,the microstructure,the oxidation resistance and the sedimentation property of modified expanded graphite were discussed.The results reveal that:(1)different surfactants result in different phase composition of the hydrothermal products,and the prepared modified expanded graphites have different oxidation resisitance and sedimentation property:whisker-like magnesium hydroxide sulfate is generated with the SDBS addition;flake magnesium hydroxide is generated with the PEG addition;both whisker-like magnesium hydroxide sulfate and flake magnesium hydroxide are generated with the PAAS addition;(2)the modified expanded graphites all have improved oxidation resistance and sedimentation property than the original expanded graphite;the modified expanded graphite prepared with PEG is the optimal.

关 键 词：RESISTANCE WHISKER MICROSTRUCTURE 

分 类 号：TQ175.7[化学工程—硅酸盐工业]