Recycling galvanized steel scrap for use in cast iron melting in induction melting facilities
Proposed is technology of preparing galvanized steel scrap for its use as charge material in cast iron melting in induction melting facilities. For protecting steel base from dissolving in acidic medium it is proposed to use as short stopping agent hexamethylenetetramine (urotropin) in the amount 2.5% by weight. Research has been done into dependence of speed of removing zinc from steel base with the initial density of hydrochloric acid 9% by weight on the amount of the processable material. A time slot optimal for processing steel scrap has been identified for the given initial density of hydrochloric acid. The quantity of commercial hydrochloric acid (70 litres) and hexamethylenetetramine needed. Based on the research findings the proposed technology of preparing galvanized steel scrap is recommended to be used in machine building plant foundries where in-house zinc coated steel scrap accounts for at least 1000 tonnes per year.