Fine　silicon　powder　mainly　containing　SiO2　is　the　dust　produced　during　silicon-iron　production　The　superfine　powder　has　amorphous　structure　and　is　metastable.　It　crystallizes　at　high　temperature　so　that　can　be　used　as　bonder,　activator　or　mineralizer　of　refractory　and　kiln　furniture.　It　is　beneficial　to　the　reaction　and　sintering　of　refractory,　the　crystal　conversion　and　high　temperature　properties.　The　process　of　crystallization　at　a　temperature　range　of　1200-1300°C　is　α-quartz　firstly　converting　into　α-cristobalite　and　then　to　α-tridymite.　The　quartz　variant　(ASTM　No.290085)　converts　to　α-cristobalite　at　the　temperature　range　of　1400-1450°C.　The　suitable　curve　of　temperature　rise　is　determined　on　the　basis　of　crystal　structure　inves-　tigation　at　different　temperature.