Abstract

Recycling of materials is becoming progressively more significant for society due to the depletion of natural resources. Jewelry wastes are considered as secondary sources of raw material and contain a very high proportion of precious metals. Scraps and wastes from jewelry activities need to be pre-treated before refining to reduce costs and maximize the recovery of precious metals. In this paper, the recovery of gold (Au) and silver (Ag) from floor sweeping jewelry wastes (FSJW) of jewelry workshops using flotation followed by leaching process was studied. In flotation experiments, optimum pH value, particle size, type, and amount of reagent were the investigated parameters. Experimental results demonstrated that the flotation method was very successful in diminishing much of the waste fraction. A froth product, with more than 280 g/t Au and 2800 g/t Ag, was produced from a feed containing 174 g/t Au and 1834 g/t Ag with approximately 87% Au and 82% Ag recoveries. To investigate the dissolution behaviors of gold and silver, cyanide leaching tests were carried out directly on the feed and the froth product. 68% Au and 75% Ag in leach that were obtained with direct feed after 48 h of leaching in 12 g/L NaCN concentration at 40 °C and 1/5 solid/liquid ratio (w/w) were enhanced to 79% Au and 84% Ag when the froth sample was subjected to leaching under the same conditions.

中文翻译：

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通过浮选氰化物浸提法从地板清扫首饰废料中回收贵金属

摘要

由于自然资源的枯竭，材料的回收对于社会越来越重要。珠宝废料被视为原材料的次要来源，并且包含非常高比例的贵金属。在精炼之前，需要对珠宝活动产生的碎屑和废物进行预处理，以降低成本并最大程度地回收贵金属。本文研究了通过浮选然后浸出工艺从珠宝加工车间的扫地珠宝废物（FSJW）中回收金（Au）和银（Ag）的方法。在浮选实验中，最适pH值，粒径，类型和试剂用量是研究的参数。实验结果表明，浮选方法在减少大部分废物中非常成功。泡沫产品 由含174 g / t Au和1834 g / t Ag的进料生产出含280 g / t Au和2800 g / t Ag的二氧化硫，其中金的回收率约为87％。为了研究金和银的溶解行为，直接在饲料和泡沫产品上进行了氰化物浸出试验。在40°C和1/5固/液比（w / w）下以12 g / L NaCN浓度浸出48小时后直接进料获得的浸出物中68％的Au和75％的Ag增至79％的Au当在相同条件下对泡沫样品进行浸提时，Ag含量为84％。