过滤洗涤干燥机在银冶炼生产中的应用

Application of Filter Washing Dryer in Silver Smelting Production

某冶炼厂铜阳极泥中银的粗炼工艺为氨浸分银–水合肼还原法,水合肼还原后需进行固液分离以得到含银98%左右的粗银粉。目前主流的固液分离方法为离心机甩干和板框压滤机压滤二种方式,但无论使用那种方式,都不可避免的会产生氨气散排的现象。本文就如何用过滤洗涤干燥机(原广泛应用于医药行业)来取代传统的过滤方式以解决氨气散排现象作一个探讨。

The roughing process of silver in copper anode slime of a smelter is ammonia leaching silver hydrazine hydrate reduction method. After hydrazine hydrate reduction, solid-liquid separation is needed to obtain coarse silver powder containing about 98% silver. At present, the mainstream solid-liquid separation methods are centrifuge drying and plate and frame filter press filtration, but no matter which way is used, it will inevitably produce the phenomenon of ammonia emission. This paper discusses how to replace the traditional filtering method with the filter washing dryer (originally widely used in the pharmaceutical industry) to solve the problem of ammonia gas dispersion.