Bioleaching of Mining Waste of Hindustan Zinc Limited, Udaipur

The research work presented in this paper is on a Biotechnological investigation for the recovery of zinc from mining waste i.e. Low grade ore Leaching Studies were carried out at different pH using mixed culture grown from mine water. Recovery of zinc in control set (without culture) was 8% in 37 days and at the same pH (1.6) with the culture of leaching bacteria, the recovery of zinc was 89%, whereas at pH 1.8 and 2.0 zinc recovery was 47% and 46% respectively. The best leaching of low grade ore was obtained at pH 1.6. From the results obtained during experimentation it is found that the recovery of zinc is not dependent only on the iron content in the solution because with the same content of iron there is a difference of recovery of zinc. It shows that both types of reaction mechanisms, direct & indirect are involved during leaching process.Keywords: Die materials, die wear, contact pressure, sliding distance, die wear test.