REDUCTION IN TOXICITY OF THE SLAG GENERATED DURING THE SECONDARY LEAD PROCESS

Sustainable process-product development & green chemistry

Environmental Engineering & Management (T1-3P)

Mr Gabriel Gomes
Universidade Federal do Rio Grande do Sul
Department of Chemical Engineering
Ciro Gavião St., 138
Postal Code: 90470-020
City: Porto Alegre
State: Rio Grande do Sul
Country: Brazil
Brazil

Mr Leandro Dalla Zen
Fundação de Ciência e Tecnologia do Estado do Rio Grande do Sul
Department of Process
das Indústrias Av., 2270, Cachoeirinha - Rio Grande do Sul
Brazil

Keywords: secondary lead, slag, characterization, reduction, toxicity

The secondary lead process in lead-acid battery scrap recycling generates a large amount of waste during the foundry stage, when lead is re-obtained in its metallic form. Due to the fact that this is the principal type of waste produced in the battery recycling industry, it represents a high economic cost to the industry concerned, and its disposal has serious environmental consequences, this paper focuses on the nature of the slag generated by two separate secondary lead production plants. First of all, an analysis of the slag was carried out in order to determine its chemical, mineralogical and structural composition, and to measure its effect on the environment. As a result of this, it was possible to identify certain deficiencies in the recycling process, and suggest ways of improving it. The overall aim was to optimize the process in order to reduce the toxicity of the slag, and, subsequently, its environmental impact.

Presented Monday 17, 13:30 to 15:00, in session Environmental Engineering & Management (T1-3P).