Pengaruh Suhu dan pH pada Presipitasi Elemen Berharga dari Larutan Leaching Low Grade Nikel Laterit Ore dengan menggunakan Pengendap Kalsium Karbonat

Abstract

Nickel has an important role in non-corrosive materials formation as well as rechargeable battery.The increasing need of nickel has led the exploration of lateritic ore with low grade nickel concentration. The content of nickel in laterite ore ranges from 1.5-2.5% (weigth basis). Due to the characteristic of low grade laterite ore, hydrometallurgy is best to apply for the nickel processing technique. Nickel laterite ore that used in this study is a low grade type obtained from Pomalaa, Southeast Sulawesi. The nickel processing with hydrometallurgical technique begins with leaching of 150 grams of laterite nickel ore using 750 mL HCl 0.1 M which is followed by precipitation using CaCO₃ 15 % to determine the maximum percent recovery of nickel and the competition from other elements in the leachate. Based on the results  that is analyzed using Inductively Coupled Plasma - Atomic Emission Spectroscopy (ICP-AES),  components taken from this leaching process are in the ionic  form of Fe, Al, Si, and Ni and the maximum percent recovery of nickel is obtained at 70°C at pH 6 and pH 7 with a percent recovery of 56.35%.