酸性焙烧-浮选联合工艺从铅银渣中回收铅银的影响因素和机制

发布时间：2018-11-20 04:52

【摘要】：传统的湿法炼锌工艺在热酸浸出阶段,会产出大量的铅银渣,由于该工艺的特点,冶炼原料中的绝大部分的铅银金属会进入铅银渣中,由于其矿石性质的特殊性,目前对铅银渣中的有价金属尚无有效的回收方法,大部分的铅银渣都采取堆存的方法。由于铅银矿物被铁酸锌包裹,利用传统的浮选工艺难以达到理想的回收效果,针对上述问题,研究了"酸性焙烧-浮选"联合工艺从铅银渣中回收铅银的影响因素和机制。结果表明:将铅银渣在650℃,硫酸用量为25%的条件下进行酸性焙烧50 min后浮选的联合工艺流程可以获得含铅46.76%,铅回收率75.89%,含银2846.41 g·t~(-1),银回收率为84.06%的铅银精矿。利用X射线衍射(XRD)、扫描电子显微镜(SEM)和能谱仪(EDS),研究了酸性焙烧的机制,通过对比焙烧前后的矿物组成及微观结构的变化,发现酸性焙烧导致包裹铅银的铁酸锌包裹层被破坏,其中的有价铅银矿物得以释放,是提高浮选回收铅银渣中铅银的主要原因。
[Abstract]:The traditional hydrometallurgical zinc smelting process will produce a large amount of lead and silver slag in the hot acid leaching stage. Because of the characteristics of this process, most of the lead and silver metals in the smelting raw materials will enter the lead and silver slag, because of the particularity of its ore properties. At present, there is no effective recovery method for valuable metals in lead-silver slag. Because lead and silver minerals are encapsulated by zinc ferrate, it is difficult to achieve ideal recovery effect by traditional flotation process. In view of the above problems, the influence factors and mechanism of recovery of lead and silver from lead-silver slag by "acid roasting flotation" combined process are studied. The results show that the combined flotation process of lead and silver slag at 650 鈩，

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