摘要
在2123K的条件下,研究了低品位铝土矿的炭热还原过程。对A1一Si.A1—Fe,Si—Fe三个二元系的分析,用Bonnier法计算了Al—Si—Fe三元系中各组元的活度,并以此对A1_2 O_3—SiO_2—Fe—C系的还原反应进行了分析。实验考察了SiO_2/Al_2O_3,CaCl_2,Ca0,C等四因素对还原反应的影响,得出了在SiO_2/Al_2O_3=0.9～1.0,CaCl_2=SiO_2重量的7%,CaO=2.5～3.75%,C=7～9%的条件下冶金效果较好,得到含铝19.2%,硅37%,铁43%的Al—Si—Fe合金。通过对实验样品的x光衍射.提出了可能的还原步骤,对还原过程、挥发损失及铝合金获得等问题进行了讨沦,认为炭热熔炼Al—Si—Fe合金是合理利用低品位铝土矿的可行途径。
The carbothermic reducticn of aluminum—bearing ores(Bauxite)has been studied at 2123K.The thermodynamics of chemical reactions in the Al_2O_3-SiO_2 —Fe—C system were analysed according to the activity—values of Al,Si,Fe in Al—Si—Fe termary system,which were calculated with Bonnier method through the study of Al—Si,Al—Fe,Si—Fe three binary systems.Further- more,the effects of the four fators SiO_2/Al_2O_3(wt ratio),CaCl_2,CaO, C to the reduction process have been invesigated,which results in the best conditions:SiO_2/Al_2O_3=0.9—1.0,CACl_2=7%(wt.of SiO_2X7%),CAO=2.5 —3.7%,C=7—9%.The Al—Si—Fe alloy obtianed contains Al 19.2%,Si 37%,Fe 43%.In addition,the possible reducing procedures were drawn from the results of X—ray diffractions of experimental samples.Finally,the problems of reduction process,volitilization losses and alloy yields were dis- cussed.We regard that the carbothermic smelting of Al—Si-Fe alloy is a feasible approach for making good use of aluminium—bearing ores.
出处
《化工冶金》
CSCD
北大核心
1989年第4期1-9,共9页
关键词
铝
铝土矿
炭热还原
Aluminum Bauxite
Al-Si-Fe alloy
Carbothermicreduction Activity
