小型預熱保溫爐注意事項:
已經受潮的石(shi)英砂(sha)(sha),尤其是#6砂(sha)(sha)和(he)#8砂(sha)(sha)(因(yin)為粘度細),儲放過久而吸(xi)收空氣(qi)中的水份,應(ying)該先用(yong)(yong)(yong)(yong)干(gan)凈的鐵(tie)鍋炒(chao)下后再使用(yong)(yong)(yong)(yong),將(jiang)四種不(bu)同粒度的石(shi)英砂(sha)(sha)和(he)硼酸反(fan)復拌和(he)三次(ci),使混合均(jun)勻,再用(yong)(yong)(yong)(yong)20目的鐵(tie)絲過篩(shai)二次(ci),這樣不(bu)僅(jin)能提(ti)高它(ta)的混合均(jun)勻度,還(huan)能將(jiang)一(yi)些外來夾雜(za)物(wu)篩(shai)去,因(yin)為夾雜(za)物(wu)中的有(you)機(ji)物(wu)質(zhi),如紗頭,草節之類的東西混在(zai)石(shi)英砂(sha)(sha)中,當(dang)爐(lu)子(zi)筑(zhu)好送(song)電升溫后,這些有(you)機(ji)物(wu)質(zhi)將(jiang)產生氣(qi)體,可能導致爐(lu)底面出現氣(qi)孔和(he)裂縫(feng),影響爐(lu)子(zi)使用(yong)(yong)(yong)(yong)壽(shou)命,嚴(yan)重(zhong)時可能發生漏銅。