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远在十九世纪之初,就开始有人研究希土碳酸盐的组成及其性质,并用于希土元素的分离、分组。前人的研究结果表明,在不同的条件下得到的产物组成不同。岡好良研究了镧、铈、钇的硝酸盐和碳酸钠体系,认为在这些体系中生成正碳酸盐。苏锵等人用物理化学分析法研究了Ce(NO_3)_3-M_2CO_3-H_2O及Y(NO_3)_3-M_2CO_3-H_2O(M=Li,Na,K,NH_4)体系,认为在这些体系中除了均生成正碳酸盐外,Ce(NO_3)_3-Na_2CO_3-H_2O及Y(NO_3)_3-(NH_)_2CO_3-H_2O体系还分别有Na[Ce(CO_3)_2]和NH_4[Y(CO_3)_2]化合物生成。本文用溶解度法、pH法、电导法和表观沉淀体积法分别研究了Ce(NO_3)_3-K_2CO_3-H_2O和La(NO_3)3-K_2CO_3-H_2O体系,并着重研究了反应剂浓度不同对所形成产物组成的影响。
Far from the beginning of the nineteenth century, some people began to study the composition and properties of the earthen carbonate and used it for the separation and grouping of the rare earth elements. The results of previous studies show that the compositions of the products obtained under different conditions are different. Gang good good study of lanthanum, cerium, yttrium nitrate and sodium carbonate system, that is generated in these systems, orthocarbonate. Su Qiang, who studied the Ce (NO_3) _3-M_2CO_3-H_2O and Y (NO_3) _3-M_2CO_3-H_2O (M = Li, Na, K, NH_4) system using the physicochemical analysis method, Ce (NO_3) _3-Na_2CO_3-H_2O and Y (NO_3) _3- (NH_) _2CO_3-H_2O systems also have Na [Ce (CO_3) _2] and NH_4 [Y (CO_3) _2] Compound generation. In this paper, Ce (NO_3) _3-K_2CO_3-H_2O and La (NO_3) 3-K_2CO_3-H_2O systems were studied respectively by solubility method, pH method, conductivity method and apparent precipitation volume method. The formation of the impact of product composition.