The BCCC-Africa has scaled up its micro-scale technology of recycling slag obtained from the recycling of used lead acid batteries (ULAB) by safe incorporation into fired building clay bricks and tiles.
The technology had earlier been developed by Dr G. U. Adie, Research Associate at the BCCC-Africa, and Senior Lecturer at the Department of Chemistry, University of Ibadan, using this as an environmentally sound management method for dealing with large amounts of hazardous slag generated by formal and semi-formal recyclers of ULAB in Nigeria. Some varieties of local Nigerian clay samples were determined to be suitable for this formulation, and the brick product samples safe from leaching of lead during normal and extreme wet precipitation events.
Funding for the pilot scaling-up of the technology was provided by The Heinrich Boll Foundation (Nigeria Office). Waste ULAB slag was obtained from the Lead Recycling Plant of the Union Autoparts Manufacturing Co. Ltd (Ibeto Group) in Nnewi, Nigeria, and had varied lead concentrations, up to 10%.
The project achieved the goal of incorporating and immobilizing the lead from the slag into the inert glassy material of the fired clay products. Some steps in the project included:
- Optimization of the clay/slag mixture to obtain the best composition.
- Characterisation of the physico-chemical, technological and microscopic properties of the raw and fired products.
- Conducting leaching tests (TCLP and SPLP) on the fired products to determine the degree of inertisation of Pb in the products.
- Ascertaining the class and grade of construction building products made from clay/slag mixture, by comparison with ASTM standards for building products.
- Test running the production of commercial bricks using a commercial ceramics production company.
Download the full project report here: http://www.basel.org.ng/index.php/extensions/hotstart-installation/scientific-technical-publications/category/61-ulab-recycling