Application of P507 and isooctanol extraction system in recovery of scandium from simulated red mud leach solution

The current recovery technique of Sc was complicated and the chemical consumption was high. This was due to the low content of Sc in resources and the difficulty of stripping. In this research, the isooctanol was added into the 2-ethylhexyl phosphonic acid mono-2-ethylhexyl ester (P507) extraction system to reduce the extraction and improve the stripping of Sc. The maximum stripping ratio of Sc from loaded organic phase by sulfuric acid can increase from 10% (without isooctanol) to 99% (with 15 vol% isooctanol). In the extraction test of the simulated red mud leaching liquor, the separation factors between Sc and Zr, Sc and Ti are 36 and 350, separately. At the same time, other metals are almost not extracted. The high selectivity and stripping of Sc suggest that the P507 with isooctanol extraction system can be applied in the practical Sc recovery process.     

含钍铀的稀土矿中微量钪的测定

试验了在６％（Ｖ／Ｖ）ＨＣＩ中用铜铁试剂－氯仿除去大部分钍,在１０％ＨＣＩ（Ｖ／Ｖ）中用二苯胍－偶氮胂Ⅲ－正于醇除尽钍铀;ＰＭＢＰ－醋酸丁酯富集钪分稀土元素;最后用半二甲酚橙显色测定钪,摩尔吸光系数为３．４×＾４;本法具有比离子交换分离法快速,成本低,结果可靠,实用性强等优点。     

磁浮联合流程全面回收白云鄂博铁、稀土、铌及钪合理性的探讨

依据白云鄂博矿中贫氧化矿主要矿物的选矿特性,在磨矿细度-74μm占90%,铁、稀土、铌单体解离度不太高的情况下,采用弱磁—强磁—浮选联合流程,首先将矿物进行合理分组,简化铁、稀土(铌)粗精矿中的矿物组成,提高铁,稀土、铌的单体解离度,并使恶化浮选作业的矿泥基本得到脱除,然后通过浮选,较经济地得到优质铁精矿、稀土精矿、稀土次精矿、富铌铁精矿等4种产品。另外,富铌铁精矿、浮铌尾矿、铁正浮尾矿中,钪有很大程度的富集,是良好的选冶提钪原料。磁浮联合流程大大提高了白云鄂博中贫氧化矿综合利用程度。     

Phase transformation and electrical properties of bismuth oxide doped scandium cerium and gadolinium stabilized zirconia (0.5Gd0.5Ce10ScSZ) for solid oxide electrolysis cell

Scandium cerium and gadolinium stabilized zirconia (SCGZ) is among the zirconia-based electrolytes which exhibits high ionic conductivity. However, stabilization of high conducting cubic phase is needed to maintain the ionic conductivity during prolonged operation. In this study, 1–2 mol% of Bi₂O₃ is added in the SCGZ to enhance the stability of the cubic phase. The phase characterization, sintering behavior, and electrochemical performance of the electrolyte-supported cells are studied. Bi₂O₃ is found to act as both phase stabilizer and sintering aid. Doping of Bi₂O₃ results in a partial decrease of unwanted rhombohedral phase (Sc₂Zr₇O₁₇) which is a low conducting phase. Increasing Bi₂O₃ content also significantly increases electrolyte densification. The unwanted rhombohedral phase is found to form at high sintering temperature. Thus, the lowest sintering temperature which is able to provide sufficiently dense electrolyte is required. In the present work, adding 2 mol% of Bi₂O₃ in the SCGZ helps reduce sintering temperature to 1350 °C with sufficiently high relative density (>96.5%). The ionic conductivity of the electrolyte is also improved with adding Bi₂O₃.     

草酸钪配合物的研究

通过用等温法研究了Ｓｃ２（Ｃ２Ｏ４）３－Ｍｅ２Ｃ２Ｏ４－Ｈ２Ｏ（Ｍｅ＝ＮＨ４＾＋、Ｎａ＾＋、Ｋ＾＋、Ｈ＾＋）体系在３０℃时的溶解度相图,摩尔电导测定表明,体系内析离的一系列草酸钪化合物均按络盐形式解离,用热重分析法研究了各种铬盐的热分解过程,同时给出了各种铬盐的Ｘ射线粉末图。     

攀枝花选钛尾矿提钪工艺的研究

研究了攀枝花钒钛磁选矿电选尾矿为原料的纯碱融熔－酸浸和石灰焙烧－酸浸，Ｐ２０４－煤油萃取、盐酸洗杂、氢氧化钠反萃提钪的工艺及粗钪的提纯精制技术，取得了钪的分解率为８９．８％和８２．１５％，萃取率约９５％，铁的洗脱率９９．５４％，钪的反萃率９９％的结果，反萃得到的氢氧化钪经提纯精制，可产出纯度为９９．９０％的Ｓｃ２Ｏ３。     

Environmental-barrier coating ceramics for resistance against attack by molten calcia-magnesia-aluminosilicate (CMAS) glass: Part II, β-Yb2Si2O7 and β-Sc2Si2O7

The high-temperature (1500?°C) interactions of two promising dense, polycrystalline EBC ceramics, β-Yb₂Si₂O₇ and β-Sc₂Si₂O₇, with a calcia-magnesia-aluminosilicate (CMAS) glass have been explored as part of a model study. Unlike YAlO₃ and γ-Y₂Si₂O₇ in the accompanying Part I paper, little or no reaction is found between the Y-free EBC ceramics and the CMAS. In the case of β-Yb₂Si₂O₇, a small amount of reaction-crystallization product Yb-Ca-Si apatite solid solution (ss) forms, whereas none is detected in the case of β-Sc₂Si₂O₇. The CMAS glass penetrates into the grain boundaries of both EBC ceramics, and they both suffer from a new type of ‘blister’ cracking damage. This is attributed to the through-thickness dilatation-gradient caused by the slow grain-boundary-penetration of the CMAS glass. The success of a ‘blister’-damage-mitigation approach is demonstrated, where 1?vol% CMAS glass is mixed into the β-Yb₂Si₂O₇ powder prior to sintering. The CMAS-glass phase at the grain boundaries promotes rapid CMAS-glass penetration, thereby avoiding the dilatation-gradient.     

钪-稀散家族中的稀土家族中的贵族

综述了攀枝花钒钛磁铁矿中钪以类质同象置换Mg-Fe的方式存在,储量丰富,潜在回收价值可观。以尾矿、废渣和废液为主要回收对象,总结了提取钪工艺以焙烧-浸出-萃取法和浸出-萃取法为主。提出以钛白废酸浸出选钛尾矿和氯化渣及烟尘全面回收钪的新途径;为攀枝花“三废”治理提供新的思路。     

钪、锆对Al-Cu-Mg-Fe-Ni系铝合金显微组织与力学性能的影响

通过添加钪,锆,调整铜量,配制实验合金,采用Ｘ射线衍射,透射电镜,扫描电镜,硬度测量,拉伸试验等手段研究了实验合金挤压棒材组织性能,探讨了含钪,锆的Ａｌ－Ｃｕ－Ｍｇ－Ｆｅ－Ｎｉ系合金的强韧化机理。在２６１８铝合金中添加钪,锆使合金的组织性能得到了明显改善,但钪,锆不宜过量。     

Substituted diamides of dipicolinic acid as extractants and ionophores for rare earth metals

The variety of newly synthesized diamides of dipicolinic acid(DPA) bearing methyl-and oxymethyl substituents in various positions of phenyl ring was investigated as potential ligands for liquid-liquid extraction of rare earth metal ions and as membrane active compounds in plasticized polymeric membranes of potentiometric sensors.It is found that scandium is extracted with 2,6-pyridinedicarboxylic acid diamides similarly to heavy lanthanides,while yttrium is extracted together with light group la...