小型預熱保溫爐注意事項:
已經受潮的石英(ying)砂(sha)(sha),尤(you)其是#6砂(sha)(sha)和#8砂(sha)(sha)(因為粘度細),儲放過久而吸收(shou)空氣中(zhong)的水份,應該先用(yong)(yong)(yong)干凈的鐵鍋炒下后再使(shi)用(yong)(yong)(yong),將(jiang)四(si)種不(bu)同粒度的石英(ying)砂(sha)(sha)和硼酸反(fan)復拌(ban)和三次,使(shi)混(hun)合(he)(he)均勻,再用(yong)(yong)(yong)20目的鐵絲過篩二次,這樣不(bu)僅能(neng)提(ti)高它的混(hun)合(he)(he)均勻度,還能(neng)將(jiang)一些外來夾雜物篩去(qu),因為夾雜物中(zhong)的有(you)機物質,如(ru)紗(sha)頭(tou),草節之類的東(dong)西(xi)混(hun)在石英(ying)砂(sha)(sha)中(zhong),當爐子筑好送電(dian)升溫(wen)后,這些有(you)機物質將(jiang)產(chan)生(sheng)氣體,可能(neng)導(dao)致(zhi)爐底面出現(xian)氣孔(kong)和裂縫,影響爐子使(shi)用(yong)(yong)(yong)壽命,嚴重時可能(neng)發生(sheng)漏(lou)銅(tong)。