Experimental investigation on the up-grading of some oxides in the salt-slag system.

盐渣体系中某些氧化物的升级实验研究

• 批准号: 62550482
• 负责人: SUITO Hideaki
• 金额: $ 1.28万
• 依托单位: TOHOKU UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1987
• 资助国家: 日本
• 起止时间: 1987 至 1988
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-62550482/
• 关键词: Salt; Slag; Immiscibility gap; Partition; Iron; Titanium; Molibdenum; シリコン; 溶解度

The partition of Fe and Ti in the NaCl-Sodiumpolyborate system has been experimentally studied in the range 900-1000゜C for 3-10 hrs. The furnace atmosphere was maintained to be air,Ar or deoxidised Ar (100ml/min). A silicon carbide vertical furnace and a high quality Al_2O_3 crucible was used for the experiments. Na_2O/B_2O_3 molar ratio in slag was less than 2/3 corresponding to the onset of slag-salt miscibility.A number of preliminary experiments were performed to determine the saturation limit of Ti and Fe in various Sodiumpolyborate melts at 900゜C. Those solubilities increased with increase in Na_2O/B_2O_3 ratio. The initial contents of Fe and Ti have been confined to be 1%.The partition of Fe in the NaCl-sodiumpolyborate system increased upto ^xNa2O/^xB2O3=0.4, reached a maximum value and decreased again. In the same range of slag composition, by raising the temperature, the partition ratio increased. Reduction in the oxygen potential reduced the partition. On the othe hand, a very slight decrease in the Ti partition ratio at higher borate concentration was noticed. The effect of reducing the oxygen potential did not show the variation of partition. By increasing the Fe and Ti concentration upto 1.4-4.7% and 1.4-2.2% respectively, the Fe and Ti partition ratios decreased. The effect of Al_2O_3 in Sodiumpolyborate melt on the partitions was investigated by using Pt crucible instead of Al_2O_3 crucihle. The partition ratios decreased slightly with increase in Al_2O_3 concentration.In view of the potential of the slag-salt system as a method of the up-grading of Mo-ore, the Simultaneous partitions of Mo, Si and Fe has been studied under air atmosphere.

已经在 900-1000゜C 范围内实验研究了 NaCl-聚硼酸钠体系中 Fe 和 Ti 的分配，持续 3-10 小时。炉内气氛保持为空气、Ar或脱氧Ar(100ml/min)。实验采用碳化硅立式炉和优质Al_2O_3坩埚。炉渣中Na_2O/B_2O_3摩尔比小于2/3，对应于炉渣-盐混溶的开始。通过大量初步实验确定了900゜C下各种聚硼酸钠熔体中Ti和Fe的饱和极限。这些溶解度随着Na_2O/B_2O_3比率的增加而增加。 Fe和Ti的初始含量被限制在1%。Fe在NaCl-聚硼酸钠体系中的分配增加到^xNa2O/^xB2O3=0.4，达到最大值并再次下降。在相同炉渣成分范围内，通过提高温度，分配比增大。氧势的降低减少了分配。另一方面，注意到在较高硼酸盐浓度下Ti分配比非常轻微地降低。降低氧势的效果并未表现出分配的变化。通过将Fe和Ti浓度分别增加至1.4-4.7%和1.4-2.2%，Fe和Ti分配比降低。用Pt坩埚代替Al_2O_3坩埚，研究了聚硼酸钠熔体中Al_2O_3对隔板的影响。随着Al_2O_3浓度的增加,分配率略有下降。鉴于渣盐体系作为钼矿提质方法的潜力,对空气气氛下Mo、Si、Fe的同时分配进行了研究。