硫化沉镍条件的热力学分析
来源期刊：中国有色金属学报1996年第3期
论文作者：曾德文 李作刚 谭鹏夫 徐盛明 张传福
文章页码：38 - 41
关键词：镍 硫化物 沉淀 热力学
Key words：nickl sulfide precipitation thermodynamics
摘 要：研究了在不同条件(如硫化物试剂、温度、pH值)下生成的镍硫化合物的组成及结构类型。在非氧化还原反应条件下，硫化沉镍产物为NiS。当温度较高(>80℃)、反应速度较快时，产物NiS为属于NiAs结构的α-NiS；当温度较低( < 60℃)、反应较缓慢时，产物为针硫镍型的β-NiS。在有电子得失的硫化沉镍过程中，沉淀产物的组成依沉镍试剂及济液pH值的变化而变化。用硫代硫酸盐沉镍，在任何pH条件下，其产物均为NiS2。在有元素硫存在并参与的沉镍反应中，NiS2总比NiS优先生成。用连二亚硫酸盐(S2O )沉镍时，若PH值大于7.09，其产物为Ni3S2，若小于7.09，则产物为NiS2。
Abstract:
Strctures and compositions of nickel sulfides formed under different conditions (for example, sulfide agents, temperature and acidity) have been studied. Under neutual condition, the products of nickel sulfide precipitation is NiS with two types of structure, α-NiS. When the temperature is more than 80℃ and the concentration of the reactant is higher, the product formed is α-NiS(NiAs structure);inversely, it is β-Nis(millerite). Under the condition of sulphidizing precipitation of nickel with oxid α-reduction, the compositions of the precipitates are dependent on the sulfide agents and pH value, In the whole range of pH value, if thiosulphate is used to precipitate nickel, the precipitate is NiS2 . In the presence of element sulfur, NiS2 can be formed selectively. When the precipitation agent is dithionite, the precipitate is Ni3S2(acid condition) ,respectively
