高稀土氧化物渣系熔化温度的测定

Melting Temperature Test of Slag Rich in Rare Earth Oxides

稀土钕铁硼、稀土储氢合金、镍氢电池电极等稀土废料经选择性氧化还原-渣金熔分处理后,其中的稀土以氧化物形态富集在熔分渣中,采用半球法对熔渣体系的熔化温度进行研究,以得到稀土氧化物含量高、熔化温度适宜的熔渣体系.结果表明,REO-SiO_2-Al_2O_3-FeO-B_2O_3渣系的熔化温度随REO含量降低、FeO含量增加而降低;REO-SiO_2-Al_2O_3-MnO渣系的熔化温度随REO含量降低而降低,60%(Pr,Nd)Ox-19.3%SiO_2-9.7%Al_2O_3-7%FeO-4%B_2O_3和55%(La,Ce)Ox-25.3%SiO_2-12.7%Al_2O_3-7%MnO渣系稀土氧化物含量高(适中)、熔化温度适宜,是最优的熔渣配比,可分别作为从钕铁硼废料和稀土储氢合金、镍氢电池电极废料中提取稀土的基础渣系.

Processed by selective oxidation-reduction and melting separation, the rare earth oxides in the rare earth wastes such as rare earth Nd Fe B, hydrogen storage alloys, Ni-MH battery electrodes, etc. were enriched into molten slag. In order to get the needed slag which was rich in rare earth oxides and with suitable melting temperature, the hemispherical method was adopted to study the melting temperature. The results showed that the melting temperature of the REO-SiO2-Al2O3-Fe O-B2O3 slag decreased as the content of REO decreased and the content of Fe O increased, and the melting temperature of the REO-SiO2-Al2O3-Mn O slag decreased with REO content reduced. Because of their high content of rare earth oxides and proper melting temperature, the 60%（Pr,Nd）Ox-19.3%SiO2-9.7%Al2O3-7%Fe O-4%B2O3 slag and the 55%（La, Ce）Ox-25.3%SiO2-12.7%Al2O3-7%Mn O slags were the best choices for the based slag for Nd Fe B and hydrogen storage alloys and Ni–MH battery electrodes to extract rare earth.