from the conferences organized by TANGER Ltd. provisional website
The sustained constant increase in the manufacture of packaging, among which tin-containing steel cans constitute a numerous group, requires searching for and implementing new methods enabling the recovery of tin from packaging scraps making up a large fraction of the generated municipal waste stream. In order to determine the preliminary assumptions for newly designed methods for tin recovery from waste steel cans, it becomes necessary to establish the basic parameters of chemical processes that might constitute a principal or additional part of an effectively operating technological line. The investigation results described in this paper relate to basic parameters of the process of leaching tin from waste can steel sheets – as input data necessary for establishing the scope and run of the tin recovery process. The testing material were steel sheet samples originating from the manufacturer of food product cans covered with a tin coating and one-sidedly and double-sidedly covered with a lacquer layer. The samples were subjected to preliminary mechanical processing in a roller mill, followed by leaching in a 1.0 M NaOH solution. The essential part of the investigation was the analysis of the possibility of removing tin from waste steel sheets that may form charge for the metallurgical process as an iron-bearing source. At the same time, the world's dwindling natural resources of tin, qualifying it for the group of critical metals, indicate the need for conducting research on the recovery of tin from waste raw materials. The presented investigation results indicate the need for undertaking further activities to determine the standard technological requirements necessary for designing and supervising the correct course of the process of recovering tin from waste steel sheets.Keywords: tin, recovery, leaching, waste can steel sheets
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