Commercially available zinc and copper concentrates usually contain a significant amount of valuable metals such as lead, silver or indium, which accumulate in the solid waste from both hydrometallurgical and pyrometallurgical production processes.<\/p>\n
Recovering these metals from this waste has the potential to offer an additional source of revenue for refineries, based either on the production of metal ingots, or the sale of concentrates with a high market value. Moreover, it makes it possible to reduce the volume of generated residues.<\/p>\n
The Proprietary Technology Development Division (PTDD) has developed a lead and silver recovery process based on hot brine leaching followed by precipitation of the valuable metals<\/strong>. The process can be applied to different sorts of metallurgical waste (oxides, sulphides, jarositic waste, among others), with certain variations to its basic structure depending on the type of waste to treat and the target metals.<\/p>\n Essentially, the process consists of four stages, rendering lead\/silver carbonate concentrate as main product:<\/strong><\/p>\n LEACHING<\/span><\/p>\n Performed in chloride medium (hot brine)<\/b>, in order to allow lead, silver and other metals pass into solution. The leaching conditions and the use of additives may vary depending on the nature of the material.<\/p>\n PRECIPITATION<\/span><\/p>\n Performed by adding carbonate<\/b> to give a first solid containing all the lead and silver from the previous solution.<\/p>\n PURIFICATION OF THE PRODUCT<\/span><\/p>\n The solid is treated to remove any contaminants and yielding a high grade lead-silver concentrate and a purity that allows to feed it directly to a melting furnace <\/b>, being free of chlorides and sulfates.<\/p>\n BRINE CONDITIONING<\/span><\/p>\n It allows the regeneration of the reaction medium, closing the hot brine circuit and thus consumptions and effluent generation minimization. It is essentially a matter of removing dissolved sulfates from previous stages, as liquid or solid sodium sulfate purge.<\/p>\n Depending on the raw materials and the target, other additional steps can be added to the basic structure:<\/b><\/p>\n The following figure shows a schematic of the process ECOLEADTM<\/sup> by identifying the key stages:<\/p>\n The main feature of this process ECOLEADTM<\/sup> is its flexibility.<\/b>You can fit a wide range of applications and materials with the necessary modifications to the basic scheme. This is thanks to the chemical process fundamentals, which are simple and most of the valuable metals are soluble in chloride medium and therefore recoverable by this process ECOLEADTM<\/sup>.<\/p>\n In practice, the recovery of valuable metals is designed ad-hoc the material and customer needs, thanks to the capability of applied research and process development in TR\u2019s Technology Center.<\/p>\n","protected":false},"excerpt":{"rendered":"Commercially available zinc and copper concentrates usually contain a significant amount of valuable metals such as lead, silver or indium, which accumulate in the solid waste from both hydrometallurgical and pyrometallurgical production processes. Recovering these metals from this waste has the potential to offer an additional source of revenue for refineries, based either on the… View Article<\/a>","protected":false},"author":2,"featured_media":0,"parent":67,"menu_order":0,"comment_status":"open","ping_status":"closed","template":"procesos-y-productos-ficha-plomo.php","meta":{"footnotes":""},"_links":{"self":[{"href":"https:\/\/ddtp.tecnicasreunidas.es\/en\/wp-json\/wp\/v2\/pages\/80"}],"collection":[{"href":"https:\/\/ddtp.tecnicasreunidas.es\/en\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/ddtp.tecnicasreunidas.es\/en\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/ddtp.tecnicasreunidas.es\/en\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/ddtp.tecnicasreunidas.es\/en\/wp-json\/wp\/v2\/comments?post=80"}],"version-history":[{"count":5,"href":"https:\/\/ddtp.tecnicasreunidas.es\/en\/wp-json\/wp\/v2\/pages\/80\/revisions"}],"predecessor-version":[{"id":780,"href":"https:\/\/ddtp.tecnicasreunidas.es\/en\/wp-json\/wp\/v2\/pages\/80\/revisions\/780"}],"up":[{"embeddable":true,"href":"https:\/\/ddtp.tecnicasreunidas.es\/en\/wp-json\/wp\/v2\/pages\/67"}],"wp:attachment":[{"href":"https:\/\/ddtp.tecnicasreunidas.es\/en\/wp-json\/wp\/v2\/media?parent=80"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}