小型預熱保溫爐注意事項:
已經受潮的石英砂,尤其是#6砂和#8砂(因為(wei)粘度細),儲放過久而吸收空氣(qi)中(zhong)(zhong)的水份(fen),應該先用(yong)(yong)干凈的鐵鍋炒下后(hou)再(zai)使(shi)用(yong)(yong),將(jiang)(jiang)四種(zhong)不(bu)同粒度的石英砂和硼酸反復拌(ban)和三次,使(shi)混合均(jun)勻,再(zai)用(yong)(yong)20目的鐵絲過篩二次,這樣不(bu)僅能提高(gao)它的混合均(jun)勻度,還能將(jiang)(jiang)一些外來夾(jia)(jia)雜物(wu)篩去(qu),因為(wei)夾(jia)(jia)雜物(wu)中(zhong)(zhong)的有機(ji)物(wu)質(zhi),如紗頭,草節之類的東(dong)西混在石英砂中(zhong)(zhong),當爐子筑好送電升溫后(hou),這些有機(ji)物(wu)質(zhi)將(jiang)(jiang)產生(sheng)氣(qi)體,可(ke)能導致爐底面(mian)出現氣(qi)孔和裂(lie)縫(feng),影(ying)響爐子使(shi)用(yong)(yong)壽命,嚴重時可(ke)能發生(sheng)漏銅。