联氨还原法从银废料中提取纯银的研究

来源期刊：中南大学学报(自然科学版)1981年第3期

论文作者：卢宜源 陈庆帮

文章页码：44 - 50

关键词：联氨； 银还原； 银浆料； 还原时间； 还原法； 银粉； 含银废料； 溶液还原； 还原率； 还原沉淀

摘    要：本文首先探讨了联氨还原的热力学,然后叙述在水溶液中用联氨使氯化银浆料或硝酸银水溶液在一定的pH范围内还原成银粉或海绵银的试验情况。讨论了各种因素——联氨浓度、pH值、银浓度、搅拌方式、还原时间等对银还原率的影响。用联氨水溶液还原银盐所制得银粉的主要特性是:颗粒细,粒形复杂,纯度高。它是制造各类银系列电触头的理想材料。本实验所用方法具有流程短、设备简单、操作容易、生产率高、生产规模可大可小、成本低等优点,是目前制取粉末冶金用纯银粉的一种新方法。

Abstract: The solution of hydrazine can reduce many rnetallic salts into metalsin the form of powder or non-uniform deposits on a base plate. This paper first gives a fairly detailed treatment on the thermodyna-mics of hydrazine reduction and then describes the expriments of reducingsilver-cantaining slurry or silver-nitrate solution in a certain range of pHvalue into metallic powder or spong. The various conditions, such as hydra-zine concentration, pH value, silver concentration, mode of stirring, time oftreatment, ect., of the efficiency of reduction are discussed. The main characteristics of the silver powder obtained from silver saltsby hydrazine reduction are: fine grain size, multitudinous grain shape, andhigh purity. It is an ideal material for making various silver electric cont-racts. The method used in the expriment possesses a series of advantages:straight-forward flowsheet, simple equipment, easy operation, suitability foreither large or small scale production, low cost of preparation, and highefficiency of production. The present method may be considered now as anew technique for making silver powder in metal powder industry.