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June 1, 2007, China adjusted the export tariffs on a large area of rare earth metals, refined lead, terbium dysprosium oxide and oxidation of 10% export levy export tariffs, leading to sharp reduction in exports, coupled with the domestic automotive lead-acid battery industry the increased demand for lead metal, lead prices have become push factors.
2007年6月1日，中国作出调整的稀土金属，精炼铅大面积的出口关税，铽镝氧化物和10％的出口征收出口关税，氧化，导致出口大幅减少，加上国内汽车领先耦合酸电池行业的铅金属的需求增加，导致价格已成为推动因素。
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Lanthanides belong to the sixth cycle of the periodic table Ⅲ B family, are all solid metal, they are La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, holmium, erbium, thulium, ytterbium, and lutetium were 15 kinds of metals and their periphery are two layers of electronic 5d16s2, while the peripheral third layer f orbital but never zero to 14, so the external electronic structure of 4f0-145d16s2, and therefore these elements in oxidation number are to 3, very close chemical properties, extraction, when it is difficult to separate them they are mostly multi-element mineral mix, more difficult to increase refining, and their atomic number of 57-71, one by one to increase the number of protons the nucleus, and thus extranuclear electron of gravity is also growing, so that atomic radius decreases with increasing atomic number Z, which makes lanthanides contraction, ionic radius is also reduced, which also makes Zr, Hf, Nb and Ta, Mo and W, the atom and ionic radius very close to each other they also determine a similar nature, resulting in difficult separation, also the tribe Ⅷ of the fifth cycle, ruthenium, rhodium, palladium, and the sixth cycle, osmium, iridium, platinum is very similar in nature, thus The six elements, said platinum group elements.
镧系元素属于周期表第六周期中ⅢB族，全部是固体金属，它们是镧、铈、镨、钕、钷、钐、铕、钆、铽、镝、钬、铒、铥、镱和镥共十五种金属元素，它们的外围两层的电子均是5d16s2，而外围第三层的f轨道电子却从零增加到14个，所以外围电子结构为4f0－145d16s2，而使这些元素氧化数均为＋3，化学性质极为接近，提炼时很难分开，它们的矿石又大多是多种元素混在一起的，更增加提纯难度，它们的原子序数为57－71，核内质子数逐个增加，因而对核外电子引力也不断增强，使原子半径随原子序数Z增加而减小，这就使镧系元素收缩、离子半径也缩小，这也使得Zr和Hf，Nb和Ta、Mo和W等原子和离子半径都很接近、也决定了它们彼此性质类似，以致难以分离、也使第Ⅷ族中第五周期的钌、铑、钯和第六周期的锇、铱、铂在性质上极为相似，因而称这六个元素为铂系元素。
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After testing on the material compositions which effect the metallic yield in the production of terbium metal , as well as the processing parameters during different stages in the reaction process, the technical conditions which can gain best metallic yield in terbium metal production are defined.
针对影响金属铽制备过程中金属收率的原料成分及反应过程不同阶段的各项工艺参数进行试验，确定了金属铽生产中获得最佳收率的工艺条件。
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The tungsten melting pot is used in SL63-7BL vacuum resistance furnace, and tantalum plate is used to gathering bulk,raw terbium metal is purified by distillation at the temperature of 1 750~1 800℃ with the vacuity of 5×10-3Pa.
在SL63—7BL真空电阻炉中使用钨坩埚，钽片做收集筒，在真空度为10-3Pa和1750￣1800℃温度下蒸馏提纯金属铽，工艺可靠，可以批量生产。
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rare earth metals：稀土金属
"稀土金属"(rare earth metals)又称稀土元素,是由元素周期表ⅣB族中钇、铕、钐、钕、镨、铒、镝、钷、镧、铽、钆、钬、铥、镱、镥等17种化学元素组成的一个金属大家庭,其实,"稀土"并不稀少,它在地壳中的含量比铜还要多,那为什么称它为"稀土"呢?