Quartzite Quarry Waste Recovery: A Case Study
The quartzite dimension stones from the region of Ouro Preto, State of Minas Gerais, Brazil are exploited by LPA (local productive agreement). There are about 350 people directly involved in this economic activity. The rock in this region is greatly weathered. Because of this, the final quartzite recovery is only about 30% of the volume, resulting in great amounts of waste which is deposited on land near the pits. At a typical quarry in Passagem de Mariana, near Ouro Preto, fragments and sand from the waste deposits were collected and characterized. The results are presented herein. After studies with three sand samples, it was verified that these sands can be used in civil construction. Also, with proper size classification, it can be utilized by casting industries. Furthermore, after being purified by high intensity magnetic separation and froth flotation, these wastes can be also used in the glass bottle industry. All of these applications are very interesting in the social, economic and environmental point of view.
Luís Guerra ROSA and Fernanda MARGARIDO
R. M. F. Lima et al., "Quartzite Quarry Waste Recovery: A Case Study", Materials Science Forum, Vols. 636-637, pp. 1244-1251, 2010