| 摘要 |
<p>The metallurgical sub-products are lixiviated with acid brine, removing the lead as chloride; without a solid-liquid sepn. stage cementation with iron sheet in presence of sulphates is carried out under strickly controlled conditions of temp., acidity, agitation and time to obtain a lead cement in granulated form contg. all the precious metals. The lixiviate separating from this cement is re-circulated after treatment to control the sulphate and iron levels.</p> |
