Investigations on mineralogical characteristics of Indonesian nickel laterite ores during the roasting process

Abstract

Nickel is obtained from laterite ores by a metallurgical process to produces ferronickel. Nickel metal is present in a carrier mineral, a nickel magnesium silicate hydrate compound called garnierite. Garnierite is the common name of magnesium silicate hydrate minerals including chlorite, clay and serpentine. This study to investigate the phase formed when the nickel ore is roasted from a temperature of 600°C to a temperature of 1000°C under atmospheric enviromental. Microscopic analysis of roasted samples was analyzed by SEM-EDX and the dehydroxylation and recrystallization was studied using DTA-TGA. The endothermic peak was appear at 78.8°C, 293.7°C and 638.0°C, this corresponds to the release of free water and the release of crystalline water. While the exothermic peak occurs at 828.0°C. The exothermic temperatures associated with structural changes due to dihydroxylation of serpentine into a forsterite phase. Based on the XRD graph it is known that the sample of the roasting will produce the olivine and forsterite phases.

Kinetic of Dissolution of Nickel Limonite Calcine by Sulfuric Acid Solution

“…Figure 1 displays the composition of the nickel limonite calcine, which comprises several minerals such as quartz (SiO2), trevorite (Fe2NiO4), clinoenstatite (MgSiO3), and fayalite (Fe2(SiO4)). The findings align with prior investigations conducted by Iwan [11] and Mayangsari [12]. [11] and Mayangsari [12].…”

“…The findings align with prior investigations conducted by Iwan [11] and Mayangsari [12]. [11] and Mayangsari [12]. Trevorite (NiFe2O4), quartz (SiO2), and fayalite (Fe2(SiO4)) were formed at reduction temperatures of 800 and 900 °C, with identical compositions and distributions.…”

Peculiarities of Dynamics of Hypergenic Mineral Transformation of Nickel Weathering Crusts of Ultramafic Rocks of the Kempirsay Group of Deposits in Western Kazakhstan

“…The more intensive the reaction of serpentine dehydration, the higher the orderliness of its crystal structure [2][3][4][5][6][7][8][9][10][11][12]. Another important thermal criterion in the diagnosis of this mineral is the exothermic effect made within ~700-810 • C. This is caused by the destruction of the dehydrated silicate-silicate framework of the serpentine structure.…”

“…Clay minerals are the most common and diverse components of nickel-bearing weathering crust. The genesis of clay minerals in weathering crusts remains a hot topic, despite numerous studies and discussions [1][2][3][4][5][6][7][8][9][10][11][12]. Highly dispersed layered silicates, which form homogeneous and mixed-layered structures, can record the dynamics of crystallochemical transformations during the interaction of a mineral with a changing environment.…”

Analisis Tipe Batuan Dasar Pembentuk Nikel Laterit Pada Block X Kabupaten Banggai, Provinsi Sulawesi Tengah

“…Garnierite memiliki struktur butiran yang halus, memiliki kristalinitas yang rendah dan terdiri dari campuran beberapa mineral. Komponen penyusun garnierit biasanya Lizardit, Antigorit, Chrysotile dan yang memiliki struktur kaya akan unsur nikel yaitu serpentin (Brinndley & Kao, 2000;I. Setiawan et al, 2019).…”