隨著熔劑(ji)(ji)(ji)用量的(de)增加，熔劑(ji)(ji)(ji)在預熱(re)焙燒時分解所留(liu)下(xia)的(de)孔隙也隨之增多，配加熔劑(ji)(ji)(ji)不僅(jin)對球(qiu)團(tuan)礦(kuang)化學成分以及礦(kuang)物組成產(chan)生影響，同時也對球(qiu)團(tuan)結(jie)構及孔隙率(lv)產(chan)生影響，從而對球(qiu)團(tuan)抗(kang)壓(ya)強度(du)及冶金性能產(chan)生一定影響。
堿(jian)(jian)度(du)(du)(du)(du)(du)和MgO含(han)(han)量(liang)(liang)對還(huan)(huan)原(yuan)(yuan)(yuan)度(du)(du)(du)(du)(du)的(de)(de)影(ying)響。還(huan)(huan)原(yuan)(yuan)(yuan)度(du)(du)(du)(du)(du)（RI）是評(ping)估鐵礦在(zai)高(gao)爐還(huan)(huan)原(yuan)(yuan)(yuan)區(qu)溫度(du)(du)(du)(du)(du)氣氛條件(jian)下，氧從(cong)鐵礦石(shi)脫除的(de)(de)趨(qu)勢及(ji)難易程度(du)(du)(du)(du)(du)的(de)(de)重要指標。影(ying)響鐵礦還(huan)(huan)原(yuan)(yuan)(yuan)度(du)(du)(du)(du)(du)的(de)(de)因素有(you)粒度(du)(du)(du)(du)(du)、孔(kong)隙(xi)率、礦物組(zu)成及(ji)結構(gou)、脈石(shi)礦物成分等。自(zi)(zi)然(ran)堿(jian)(jian)度(du)(du)(du)(du)(du)、自(zi)(zi)然(ran)MgO含(han)(han)量(liang)(liang)的(de)(de)酸(suan)性球(qiu)(qiu)(qiu)(qiu)團(tuan)(tuan)(tuan)還(huan)(huan)原(yuan)(yuan)(yuan)度(du)(du)(du)(du)(du)較(jiao)(jiao)低(di)，只有(you)62.22%，隨著MgO含(han)(han)量(liang)(liang)的(de)(de)提(ti)(ti)高(gao)，還(huan)(huan)原(yuan)(yuan)(yuan)度(du)(du)(du)(du)(du)提(ti)(ti)高(gao)，當(dang)MgO含(han)(han)量(liang)(liang)為(wei)3.0%時，球(qiu)(qiu)(qiu)(qiu)團(tuan)(tuan)(tuan)還(huan)(huan)原(yuan)(yuan)(yuan)度(du)(du)(du)(du)(du)可以達到68%；在(zai)自(zi)(zi)然(ran)MgO含(han)(han)量(liang)(liang)下，提(ti)(ti)高(gao)堿(jian)(jian)度(du)(du)(du)(du)(du)，鏡鐵礦球(qiu)(qiu)(qiu)(qiu)團(tuan)(tuan)(tuan)還(huan)(huan)原(yuan)(yuan)(yuan)度(du)(du)(du)(du)(du)有(you)較(jiao)(jiao)大提(ti)(ti)高(gao)，堿(jian)(jian)度(du)(du)(du)(du)(du)提(ti)(ti)高(gao)至1.2時，球(qiu)(qiu)(qiu)(qiu)團(tuan)(tuan)(tuan)還(huan)(huan)原(yuan)(yuan)(yuan)度(du)(du)(du)(du)(du)升至72.82%。這是由于(yu)石(shi)灰石(shi)的(de)(de)加(jia)入增(zeng)(zeng)(zeng)加(jia)了(le)球(qiu)(qiu)(qiu)(qiu)團(tuan)(tuan)(tuan)的(de)(de)孔(kong)隙(xi)率，同(tong)時，CaO與Fe2O3反應(ying)生(sheng)(sheng)成易于(yu)還(huan)(huan)原(yuan)(yuan)(yuan)的(de)(de)鐵酸(suan)鈣(gai)。堿(jian)(jian)度(du)(du)(du)(du)(du)和MgO共同(tong)作用(yong)時，相(xiang)同(tong)堿(jian)(jian)度(du)(du)(du)(du)(du)下，鏡鐵礦球(qiu)(qiu)(qiu)(qiu)團(tuan)(tuan)(tuan)還(huan)(huan)原(yuan)(yuan)(yuan)度(du)(du)(du)(du)(du)隨MgO含(han)(han)量(liang)(liang)的(de)(de)增(zeng)(zeng)(zeng)加(jia)而(er)提(ti)(ti)高(gao)；相(xiang)同(tong)MgO含(han)(han)量(liang)(liang)下，還(huan)(huan)原(yuan)(yuan)(yuan)度(du)(du)(du)(du)(du)隨堿(jian)(jian)度(du)(du)(du)(du)(du)的(de)(de)提(ti)(ti)高(gao)而(er)升高(gao)。當(dang)堿(jian)(jian)度(du)(du)(du)(du)(du)達到1.2、MgO含(han)(han)量(liang)(liang)增(zeng)(zeng)(zeng)加(jia)到3.0%時，球(qiu)(qiu)(qiu)(qiu)團(tuan)(tuan)(tuan)還(huan)(huan)原(yuan)(yuan)(yuan)度(du)(du)(du)(du)(du)高(gao)達76.94%。這是因為(wei)菱鎂(mei)礦在(zai)球(qiu)(qiu)(qiu)(qiu)團(tuan)(tuan)(tuan)預熱焙燒時同(tong)樣使(shi)球(qiu)(qiu)(qiu)(qiu)團(tuan)(tuan)(tuan)孔(kong)隙(xi)率增(zeng)(zeng)(zeng)加(jia)，而(er)且MgO可以提(ti)(ti)高(gao)渣相(xiang)及(ji)浮氏(shi)體熔點，使(shi)其在(zai)還(huan)(huan)原(yuan)(yuan)(yuan)過程中不易發(fa)生(sheng)(sheng)熔化，使(shi)球(qiu)(qiu)(qiu)(qiu)團(tuan)(tuan)(tuan)孔(kong)隙(xi)不被熔融(rong)物充填(tian)而(er)保持較(jiao)(jiao)高(gao)孔(kong)隙(xi)率，這有(you)利于(yu)氣體擴(kuo)散。
堿(jian)(jian)(jian)度(du)(du)(du)和(he)MgO含(han)量(liang)(liang)(liang)對還原(yuan)(yuan)(yuan)(yuan)膨(peng)(peng)脹(zhang)(zhang)的(de)(de)(de)影響。自(zi)然MgO含(han)量(liang)(liang)(liang)下(xia)，鏡鐵(tie)礦球(qiu)(qiu)團(tuan)還原(yuan)(yuan)(yuan)(yuan)膨(peng)(peng)脹(zhang)(zhang)率先增(zeng)(zeng)大(da)后(hou)減小，堿(jian)(jian)(jian)度(du)(du)(du)在(zai)(zai)(zai)(zai)0.4～0.6達到(dao)最(zui)大(da)值，其(qi)最(zui)大(da)值高達32%。這(zhe)(zhe)是由于(yu)配加(jia)到(dao)球(qiu)(qiu)團(tuan)中(zhong)(zhong)(zhong)的(de)(de)(de)CaO除少部(bu)分(fen)與(yu)Fe2O3反應生產鐵(tie)酸鈣，絕大(da)部(bu)分(fen)進入(ru)渣相(xiang)(xiang)(xiang)，未還原(yuan)(yuan)(yuan)(yuan)時(shi)(shi)，渣相(xiang)(xiang)(xiang)以(yi)CaO-SiO2二(er)元體系(xi)(xi)為主。而(er)(er)堿(jian)(jian)(jian)度(du)(du)(du)在(zai)(zai)(zai)(zai)0.4～0.6時(shi)(shi)，即SiO2在(zai)(zai)(zai)(zai)渣相(xiang)(xiang)(xiang)中(zhong)(zhong)(zhong)的(de)(de)(de)含(han)量(liang)(liang)(liang)在(zai)(zai)(zai)(zai)62.5%～70%，正是偏硅酸鈣(CaOSiO2)與(yu)SiO2的(de)(de)(de)二(er)元共(gong)(gong)晶點(dian)組成(cheng)所在(zai)(zai)(zai)(zai)區間，其(qi)低(di)(di)溫共(gong)(gong)熔(rong)(rong)點(dian)為1436℃，但是在(zai)(zai)(zai)(zai)還原(yuan)(yuan)(yuan)(yuan)條件下(xia)，此渣相(xiang)(xiang)(xiang)由于(yu)FeO的(de)(de)(de)加(jia)入(ru)則成(cheng)為CaO-SiO2-FeO三(san)(san)元渣系(xi)(xi)，在(zai)(zai)(zai)(zai)此渣系(xi)(xi)中(zhong)(zhong)(zhong)CaO和(he)SiO2比例保持(chi)不變(bian)，渣相(xiang)(xiang)(xiang)熔(rong)(rong)點(dian)隨著FeO含(han)量(liang)(liang)(liang)增(zeng)(zeng)多急劇下(xia)降(jiang)，在(zai)(zai)(zai)(zai)純三(san)(san)元渣系(xi)(xi)中(zhong)(zhong)(zhong)最(zui)低(di)(di)可(ke)降(jiang)到(dao)1093℃，而(er)(er)低(di)(di)熔(rong)(rong)點(dian)渣相(xiang)(xiang)(xiang)恰(qia)恰(qia)會惡化球(qiu)(qiu)團(tuan)還原(yuan)(yuan)(yuan)(yuan)膨(peng)(peng)脹(zhang)(zhang)。自(zi)然堿(jian)(jian)(jian)度(du)(du)(du)下(xia)，球(qiu)(qiu)團(tuan)還原(yuan)(yuan)(yuan)(yuan)膨(peng)(peng)脹(zhang)(zhang)率隨MgO含(han)量(liang)(liang)(liang)的(de)(de)(de)增(zeng)(zeng)加(jia)略有(you)(you)降(jiang)低(di)(di)，但不明顯。這(zhe)(zhe)是由于(yu)自(zi)然堿(jian)(jian)(jian)度(du)(du)(du)和(he)自(zi)然MgO的(de)(de)(de)球(qiu)(qiu)團(tuan)渣相(xiang)(xiang)(xiang)中(zhong)(zhong)(zhong)SiO2含(han)量(liang)(liang)(liang)在(zai)(zai)(zai)(zai)90%時(shi)(shi)熔(rong)(rong)點(dian)高達1700℃，而(er)(er)MgO的(de)(de)(de)加(jia)入(ru)，渣相(xiang)(xiang)(xiang)以(yi)MgO-SiO2二(er)元體系(xi)(xi)為主，但其(qi)低(di)(di)溫共(gong)(gong)熔(rong)(rong)點(dian)溫度(du)(du)(du)也(ye)有(you)(you)1543℃。在(zai)(zai)(zai)(zai)堿(jian)(jian)(jian)度(du)(du)(du)和(he)MgO共(gong)(gong)同(tong)作用時(shi)(shi)，相(xiang)(xiang)(xiang)同(tong)MgO含(han)量(liang)(liang)(liang)下(xia)，堿(jian)(jian)(jian)度(du)(du)(du)對球(qiu)(qiu)團(tuan)還原(yuan)(yuan)(yuan)(yuan)膨(peng)(peng)脹(zhang)(zhang)率的(de)(de)(de)影響規律(lv)基(ji)本與(yu)自(zi)然MgO含(han)量(liang)(liang)(liang)一(yi)致。而(er)(er)MgO加(jia)入(ru)時(shi)(shi)，由于(yu)MgO溶(rong)入(ru)浮氏(shi)體中(zhong)(zhong)(zhong)從而(er)(er)提高浮氏(shi)體熔(rong)(rong)點(dian)，同(tong)時(shi)(shi)，MgO在(zai)(zai)(zai)(zai)渣相(xiang)(xiang)(xiang)中(zhong)(zhong)(zhong)同(tong)樣(yang)提高渣相(xiang)(xiang)(xiang)熔(rong)(rong)點(dian)。因此，在(zai)(zai)(zai)(zai)相(xiang)(xiang)(xiang)同(tong)堿(jian)(jian)(jian)度(du)(du)(du)下(xia)，增(zeng)(zeng)加(jia)MgO含(han)量(liang)(liang)(liang)可(ke)以(yi)降(jiang)低(di)(di)還原(yuan)(yuan)(yuan)(yuan)膨(peng)(peng)脹(zhang)(zhang)。
氧化球(qiu)(qiu)團(tuan)(tuan)中赤(chi)鐵(tie)礦(kuang)還(huan)(huan)(huan)原(yuan)(yuan)(yuan)向磁鐵(tie)礦(kuang)及(ji)浮氏體轉(zhuan)變時會(hui)產生(sheng)(sheng)體積膨(peng)脹(zhang)(zhang)，這(zhe)種膨(peng)脹(zhang)(zhang)主要是赤(chi)鐵(tie)礦(kuang)還(huan)(huan)(huan)原(yuan)(yuan)(yuan)成磁鐵(tie)礦(kuang)時晶體結構的變化導致(zhi)。球(qiu)(qiu)團(tuan)(tuan)還(huan)(huan)(huan)原(yuan)(yuan)(yuan)膨(peng)脹(zhang)(zhang)率(lv)大小與脈石成分(fen)及(ji)渣(zha)相(xiang)承受赤(chi)鐵(tie)礦(kuang)顆粒(li)還(huan)(huan)(huan)原(yuan)(yuan)(yuan)時產生(sheng)(sheng)應力的能力有(you)(you)關。高(gao)(gao)熔(rong)(rong)點(dian)渣(zha)相(xiang)在還(huan)(huan)(huan)原(yuan)(yuan)(yuan)過程中，不易(yi)發生(sheng)(sheng)熔(rong)(rong)化，保(bao)持較高(gao)(gao)強度(du)可(ke)以(yi)有(you)(you)效限制球(qiu)(qiu)團(tuan)(tuan)的還(huan)(huan)(huan)原(yuan)(yuan)(yuan)膨(peng)脹(zhang)(zhang)率(lv)，而低熔(rong)(rong)點(dian)渣(zha)相(xiang)會(hui)惡化球(qiu)(qiu)團(tuan)(tuan)還(huan)(huan)(huan)原(yuan)(yuan)(yuan)膨(peng)脹(zhang)(zhang)。 球(qiu)(qiu)團(tuan)(tuan)還(huan)(huan)(huan)原(yuan)(yuan)(yuan)膨(peng)脹(zhang)(zhang)率(lv)在20%以(yi)下屬(shu)于(yu)正常膨(peng)脹(zhang)(zhang)范圍(wei)，鏡鐵(tie)礦(kuang)球(qiu)(qiu)團(tuan)(tuan)堿度(du)需控(kong)制在小于(yu)0.2或大于(yu)等于(yu)1.0的范圍(wei)內。然而，通(tong)常工(gong)業生(sheng)(sheng)產中球(qiu)(qiu)團(tuan)(tuan)還(huan)(huan)(huan)原(yuan)(yuan)(yuan)膨(peng)脹(zhang)(zhang)率(lv)要求控(kong)制在15%以(yi)下。對含3.0%~3.1%SiO2的自然堿度(du)鏡鐵(tie)礦(kuang)球(qiu)(qiu)團(tuan)(tuan)，其還(huan)(huan)(huan)原(yuan)(yuan)(yuan)膨(peng)脹(zhang)(zhang)率(lv)低于(yu)15%，且還(huan)(huan)(huan)原(yuan)(yuan)(yuan)度(du)僅為62.2%，通(tong)過提高(gao)(gao)堿度(du)的方式改善其還(huan)(huan)(huan)原(yuan)(yuan)(yuan)度(du)時，需要將堿度(du)提高(gao)(gao)至1.0和(he)MgO含量(liang)提高(gao)(gao)到3.0%，或將堿度(du)提高(gao)(gao)至1.2和(he)MgO含量(liang)≥1.0%時，才(cai)能使其還(huan)(huan)(huan)原(yuan)(yuan)(yuan)膨(peng)脹(zhang)(zhang)率(lv)低于(yu)15%。
堿度和MgO含量對(dui)低(di)溫(wen)還(huan)原(yuan)(yuan)(yuan)(yuan)(yuan)粉(fen)(fen)化(hua)(hua)的(de)影響。低(di)溫(wen)還(huan)原(yuan)(yuan)(yuan)(yuan)(yuan)粉(fen)(fen)化(hua)(hua)（RDI）反(fan)映球團(tuan)在(zai)(zai)高(gao)(gao)爐或直接還(huan)原(yuan)(yuan)(yuan)(yuan)(yuan)豎爐上部400℃～600℃溫(wen)度區(qu)間還(huan)原(yuan)(yuan)(yuan)(yuan)(yuan)時(shi)產(chan)生粉(fen)(fen)末的(de)趨勢。低(di)溫(wen)還(huan)原(yuan)(yuan)(yuan)(yuan)(yuan)粉(fen)(fen)化(hua)(hua)產(chan)生的(de)主要(yao)原(yuan)(yuan)(yuan)(yuan)(yuan)因(yin)是(shi)赤(chi)(chi)鐵礦(kuang)還(huan)原(yuan)(yuan)(yuan)(yuan)(yuan)成磁(ci)鐵礦(kuang)時(shi)晶(jing)體(ti)結(jie)構轉換所(suo)產(chan)生的(de)體(ti)積膨脹及晶(jing)格畸(ji)變(bian)。球團(tuan)預熱焙燒時(shi)形(xing)成的(de)黏(nian)結(jie)方式(shi)主要(yao)有(you)3種：鐵氧(yang)化(hua)(hua)物再結(jie)晶(jing)、硅(gui)酸鹽黏(nian)結(jie)和鐵酸鹽黏(nian)結(jie)。其中，赤(chi)(chi)鐵礦(kuang)再結(jie)晶(jing)黏(nian)結(jie)最(zui)為普遍也是(shi)強度最(zui)高(gao)(gao)的(de)，但是(shi)赤(chi)(chi)鐵礦(kuang)在(zai)(zai)還(huan)原(yuan)(yuan)(yuan)(yuan)(yuan)條件下(xia)卻(que)是(shi)極不穩定的(de)，而硅(gui)酸鹽黏(nian)結(jie)相在(zai)(zai)赤(chi)(chi)鐵礦(kuang)還(huan)原(yuan)(yuan)(yuan)(yuan)(yuan)成磁(ci)鐵礦(kuang)時(shi)卻(que)可以保(bao)持不變(bian)。因(yin)此，可以通過添加(jia)熔劑的(de)方式(shi)增加(jia)這種分布均勻且(qie)在(zai)(zai)低(di)溫(wen)還(huan)原(yuan)(yuan)(yuan)(yuan)(yuan)條件下(xia)保(bao)持穩定的(de)黏(nian)結(jie)相，以降低(di)鏡鐵礦(kuang)球團(tuan)低(di)溫(wen)還(huan)原(yuan)(yuan)(yuan)(yuan)(yuan)粉(fen)(fen)化(hua)(hua)。
自然(ran)堿(jian)度和(he)自然(ran)MgO含(han)量(liang)的(de)(de)(de)球(qiu)(qiu)(qiu)團由于其主要為赤鐵(tie)礦固相擴散固結，硅(gui)酸(suan)(suan)鹽(yan)黏結相較少(shao)，因(yin)此，在(zai)低(di)(di)溫(wen)還(huan)原時(shi)產(chan)生較多(duo)(duo)粉(fen)末，其RDI-3.15mm值高達12.75%。自然(ran)MgO含(han)量(liang)下(xia)，堿(jian)度提(ti)(ti)高至(zhi)0.2，球(qiu)(qiu)(qiu)團低(di)(di)溫(wen)還(huan)原粉(fen)化(hua)率(lv)RDI-3.15mm值迅速(su)降低(di)(di)至(zhi)0.52%；堿(jian)度繼續提(ti)(ti)高，RDI-3.15mm值基本維持在(zai)0.5%左右(you)。這是由于CaO的(de)(de)(de)加(jia)入，使得球(qiu)(qiu)(qiu)團在(zai)預熱(re)焙燒時(shi)可以(yi)形成較多(duo)(duo)的(de)(de)(de)低(di)(di)溫(wen)還(huan)原時(shi)穩定存在(zai)的(de)(de)(de)硅(gui)酸(suan)(suan)鹽(yan)液(ye)相，從(cong)而達到降低(di)(di)球(qiu)(qiu)(qiu)團低(di)(di)溫(wen)還(huan)原粉(fen)化(hua)的(de)(de)(de)目(mu)的(de)(de)(de)。自然(ran)堿(jian)度下(xia)，增(zeng)加(jia)MgO含(han)量(liang)，球(qiu)(qiu)(qiu)團低(di)(di)溫(wen)還(huan)原粉(fen)化(hua)率(lv)RDI-3.15mm值均降至(zhi)3.0%以(yi)下(xia)。當堿(jian)度和(he)MgO共同作用(yong)時(shi)，球(qiu)(qiu)(qiu)團低(di)(di)溫(wen)還(huan)原粉(fen)化(hua)RDI-3.15mm值均較低(di)(di)，RDI-3.15mm隨堿(jian)度的(de)(de)(de)提(ti)(ti)高而降低(di)(di)，隨MgO含(han)量(liang)的(de)(de)(de)提(ti)(ti)高略有升(sheng)高，這是由于MgO有阻礙液(ye)相硅(gui)酸(suan)(suan)鹽(yan)形成的(de)(de)(de)作用(yong)。
堿(jian)(jian)度(du)(du)和MgO含(han)(han)量(liang)(liang)對軟(ruan)熔(rong)(rong)(rong)(rong)特(te)(te)性(xing)的(de)(de)(de)(de)影(ying)響(xiang)。球(qiu)團的(de)(de)(de)(de)熔(rong)(rong)(rong)(rong)融特(te)(te)性(xing)可(ke)以(yi)反映(ying)球(qiu)團在高(gao)(gao)爐(lu)下部軟(ruan)化(hua)熔(rong)(rong)(rong)(rong)融區(qu)(qu)的(de)(de)(de)(de)形(xing)成及其在軟(ruan)熔(rong)(rong)(rong)(rong)區(qu)(qu)的(de)(de)(de)(de)性(xing)能，爐(lu)料軟(ruan)熔(rong)(rong)(rong)(rong)特(te)(te)性(xing)對高(gao)(gao)爐(lu)操作有較大影(ying)響(xiang)。球(qiu)團軟(ruan)化(hua)溫(wen)(wen)(wen)度(du)(du)低(di)，軟(ruan)熔(rong)(rong)(rong)(rong)區(qu)(qu)間寬，高(gao)(gao)爐(lu)下部軟(ruan)熔(rong)(rong)(rong)(rong)區(qu)(qu)透(tou)氣(qi)性(xing)就(jiu)會變(bian)差，這不(bu)利于(yu)(yu)還(huan)原(yuan)氣(qi)體(ti)(ti)與(yu)爐(lu)料對流，嚴重影(ying)響(xiang)還(huan)原(yuan)過程的(de)(de)(de)(de)進(jin)行。自(zi)然(ran)堿(jian)(jian)度(du)(du)、自(zi)然(ran)MgO含(han)(han)量(liang)(liang)的(de)(de)(de)(de)酸(suan)性(xing)球(qiu)團在1009℃即開始軟(ruan)化(hua)，滴落溫(wen)(wen)(wen)度(du)(du)為1272℃。自(zi)然(ran)MgO含(han)(han)量(liang)(liang)下，堿(jian)(jian)度(du)(du)提高(gao)(gao)至(zhi)(zhi)1.2，球(qiu)團軟(ruan)化(hua)溫(wen)(wen)(wen)度(du)(du)提高(gao)(gao)至(zhi)(zhi)1034℃，軟(ruan)化(hua)區(qu)(qu)間及軟(ruan)化(hua)區(qu)(qu)間都變(bian)窄(zhai)一些，滴落溫(wen)(wen)(wen)度(du)(du)也提高(gao)(gao)至(zhi)(zhi)1299℃。堿(jian)(jian)度(du)(du)1.2時(shi)，提高(gao)(gao)MgO含(han)(han)量(liang)(liang)可(ke)以(yi)提高(gao)(gao)軟(ruan)化(hua)開始溫(wen)(wen)(wen)度(du)(du)和滴落溫(wen)(wen)(wen)度(du)(du)，MgO含(han)(han)量(liang)(liang)1.0%時(shi)，球(qiu)團軟(ruan)化(hua)溫(wen)(wen)(wen)度(du)(du)升至(zhi)(zhi)1072℃，滴落溫(wen)(wen)(wen)度(du)(du)達到(dao)1319℃，MgO含(han)(han)量(liang)(liang)繼續增加，球(qiu)團軟(ruan)化(hua)溫(wen)(wen)(wen)度(du)(du)不(bu)再增加，滴落溫(wen)(wen)(wen)度(du)(du)有所(suo)提高(gao)(gao)。球(qiu)團軟(ruan)熔(rong)(rong)(rong)(rong)特(te)(te)性(xing)主要受還(huan)原(yuan)時(shi)產生的(de)(de)(de)(de)浮氏體(ti)(ti)及渣相(xiang)等低(di)熔(rong)(rong)(rong)(rong)點液相(xiang)影(ying)響(xiang)。酸(suan)性(xing)球(qiu)團所(suo)表(biao)現出(chu)的(de)(de)(de)(de)較差的(de)(de)(de)(de)高(gao)(gao)溫(wen)(wen)(wen)軟(ruan)熔(rong)(rong)(rong)(rong)特(te)(te)性(xing)，主要原(yuan)因在于(yu)(yu)還(huan)原(yuan)過程中富(fu)含(han)(han)FeO的(de)(de)(de)(de)橄(gan)欖石渣相(xiang)熔(rong)(rong)(rong)(rong)點較低(di)，而加入MgO可(ke)以(yi)提高(gao)(gao)渣相(xiang)熔(rong)(rong)(rong)(rong)點，還(huan)原(yuan)過程中MgO與(yu)浮氏體(ti)(ti)形(xing)成高(gao)(gao)熔(rong)(rong)(rong)(rong)點的(de)(de)(de)(de)固溶體(ti)(ti)也會起到(dao)改(gai)善球(qiu)團高(gao)(gao)溫(wen)(wen)(wen)軟(ruan)熔(rong)(rong)(rong)(rong)特(te)(te)性(xing)的(de)(de)(de)(de)作用。