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

The partition of Fe and Ti in The nacc - sodiumpolyborate system has been experimentally studied inthe range 900-1000 C for 3-10 hrs. the furnace atmosphere was maintained to be air,Ar or deoxidisedAr (100ml/min). A silicon carbide vertical furnace and A high quality al_2_3 crucible was used forthe experiments. na_2o / b_2_3 molar ratio in slag was less than 2/3 corresponding to the onset ofslag-salt miscibility.A number of preliminary experiments performed to determine the saturation在各种各样的Sodiumpolyborate melts at 900 C. Those solubilities increased withincrease in na_2o / b_2_3 ratio. The initial contents of Fe and Ti have be confined to be 1%.Thepartition of Fe in the nack -sodiumpolyborate system increased upto xNa2O/ xB2O3=0.4，reached a maximum value and decreased again In the same range of slag compositionby raising the temperature，the partition ratio increased. Reduction in the oxygen potential reduced the partition On the othe贪污,a very slight decrease in the Ti partition ratio at higher borate concentration was noticed. the效果减少the oxygen potential did not show the variation of partition. By increasing theFe and Ti concentration upto 1.4-4.7% and 1.4-2.2% respectively，the Fe和Ti partition ratios decreased. the effect of al_2_3 in Sodiumpolyborate melt on thepartitions was investigated by using Pt crucible instead of al_2_3 crucihle. The partition ratiosdecreased slightly with increase in al_2_3 concentration.In view of the potential of the slag-saltsystem as a method of the up-grading of Mo-ore, the Simultaneous partitions of Mo，Si and Fe has been studied under air atmosphere

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.