電(dian)熔(rong)(rong)(rong)(rong)(rong)鎂(mei)(mei)(mei)(mei)(mei)砂(sha)(sha)(sha)目前生(sheng)產電(dian)熔(rong)(rong)(rong)(rong)(rong)鎂(mei)(mei)(mei)(mei)(mei)砂(sha)(sha)(sha)的(de)工(gong)藝(yi)方法是(shi)(shi)(shi)普遍采用(yong)電(dian)爐進(jin)行熔(rong)(rong)(rong)(rong)(rong)煉(lian)，直接熔(rong)(rong)(rong)(rong)(rong)煉(lian)鎂(mei)(mei)(mei)(mei)(mei)礦石，不足(zu)之處是(shi)(shi)(shi)耗電(dian)量大，再者用(yong)現有工(gong)藝(yi)每熔(rong)(rong)(rong)(rong)(rong)煉(lian)一噸合(he)(he)格(ge)電(dian)熔(rong)(rong)(rong)(rong)(rong)鎂(mei)(mei)(mei)(mei)(mei)砂(sha)(sha)(sha)(純(chun)度高(gao)(gao)于96.5%)還需消耗80公斤(jin)碳(tan)精棒，有關資(zi)(zi)料(liao)(《特(te)種耐(nai)火材(cai)料(liao)》、《鎂(mei)(mei)(mei)(mei)(mei)砂(sha)(sha)(sha)工(gong)藝(yi)學》、《高(gao)(gao)溫(wen)耐(nai)火材(cai)料(liao)論文集》)表明，將輕質鎂(mei)(mei)(mei)(mei)(mei)砂(sha)(sha)(sha)用(yong)電(dian)弧加溫(wen)，可生(sheng)成(cheng)立方結(jie)構的(de)晶(jing)體，即熔(rong)(rong)(rong)(rong)(rong)點為2800℃的(de)重質氧(yang)化鎂(mei)(mei)(mei)(mei)(mei)，亦即電(dian)熔(rong)(rong)(rong)(rong)(rong)鎂(mei)(mei)(mei)(mei)(mei)砂(sha)(sha)(sha)。用(yong)爐窯(yao)生(sheng)產的(de)鎂(mei)(mei)(mei)(mei)(mei)砂(sha)(sha)(sha)，經過(guo)電(dian)爐熔(rong)(rong)(rong)(rong)(rong)煉(lian)使(shi)其再結(jie)晶(jing)，可生(sheng)產出電(dian)熔(rong)(rong)(rong)(rong)(rong)鎂(mei)(mei)(mei)(mei)(mei)砂(sha)(sha)(sha)。窯(yao)內熟料(liao)顆粒是(shi)(shi)(shi)在(zai)液(ye)(ye)相(有些資(zi)(zi)料(liao)稱熔(rong)(rong)(rong)(rong)(rong)體)作用(yong)下形成(cheng)的(de)，液(ye)(ye)相在(zai)晶(jing)體外(wai)形成(cheng)毛(mao)細管橋。液(ye)(ye)相毛(mao)細管橋起(qi)到兩個作用(yong)：一是(shi)(shi)(shi)使(shi)顆粒結(jie)合(he)(he)在(zai)一起(qi)，另(ling)一作用(yong)是(shi)(shi)(shi)作為中電(dian)熔(rong)(rong)(rong)(rong)(rong)鎂(mei)(mei)(mei)(mei)(mei)砂(sha)(sha)(sha)間介(jie)質，使(shi)CaO 和(he)C2S在(zai)熔(rong)(rong)(rong)(rong)(rong)

融態內擴散生成C3S，顆粒的強度取電熔鎂砂決于毛細管橋的強度，橋的強度，即連接顆粒的力隨液相表面張力的增加和顆粒直徑的降低而增加。毛細管橋的數量又和顆粒直徑的平方根成反比。要結好粒，必須有足夠的液相，并要求顆粒在液相內分布均勻，形成較高的表面張力，較低的液相粘度，適宜的結粒時間和溫度等。化學結合耐火泥由耐火細骨料和化學結合劑(無機、有機一無機、有機)組成的混合料。交貨狀態既可以是漿狀，又可以是干狀，在低于陶瓷結合溫度以下硬化。按照硬化溫度，這種耐火泥可分為氣硬性和熱硬性兩種。氣硬性耐火泥常用水玻璃等氣硬性結合劑配制。熱硬電熔鎂砂性耐火泥常用磷酸或磷酸鹽等熱硬性結合劑配制。這種熱硬性耐火泥硬化后，除在各種溫度下都具有較高的強度以外，還一具有收縮小、接縫嚴密、耐蝕性強等特點。