小型預熱保溫爐注意事項:
已(yi)經受潮的石英(ying)砂,尤其是#6砂和#8砂(因為粘度(du)細),儲(chu)放過久而(er)吸收空氣(qi)中(zhong)(zhong)的水份,應該(gai)先(xian)用(yong)(yong)干凈的鐵鍋炒下后再使(shi)用(yong)(yong),將(jiang)(jiang)四種不(bu)同(tong)粒度(du)的石英(ying)砂和硼酸反復拌和三次,使(shi)混合均(jun)勻,再用(yong)(yong)20目的鐵絲過篩二次,這樣不(bu)僅(jin)能(neng)(neng)提(ti)高它的混合均(jun)勻度(du),還能(neng)(neng)將(jiang)(jiang)一些外(wai)來夾雜物(wu)篩去,因為夾雜物(wu)中(zhong)(zhong)的有機物(wu)質,如紗頭,草節之(zhi)類(lei)的東(dong)西混在石英(ying)砂中(zhong)(zhong),當爐(lu)子筑(zhu)好送電升溫后,這些有機物(wu)質將(jiang)(jiang)產生(sheng)氣(qi)體,可能(neng)(neng)導致爐(lu)底面(mian)出現氣(qi)孔(kong)和裂縫,影響爐(lu)子使(shi)用(yong)(yong)壽命(ming),嚴重時可能(neng)(neng)發生(sheng)漏銅。