Pan American Materials Congress: Minerals Extraction and Processing: Ore Processing
Sponsored by: Third Pan American Materials Congress Organizing Committee
Program Organizers: Mery Gómez Marroquín, Asociacion Peruana de Metalurgia Materiales y Minerales-APMMM; Mark Schlesinger, Missouri University of Science and Technology; Alejandro Valdivieso, U.A. of San Luis Potosi; Carlos Sampaio, UFRGS

Thursday 2:00 PM
March 2, 2017
Room: Marina E
Location: Marriott Marquis Hotel

2:00 PM  
Preparation Conditions and Performance of Nano/Amorphous Hybrid Oxide Coated Titanium Anode for Oxygen Evolution in Electrowinning: Masafumi Yasuno1; Masatsugu Morimitsu1; 1Doshisha University
    This paper reports the novel preparation conditions of nano/amorphous hybrid structure of RuO2-Ta2O5 coated titanium anodes and their performance on oxygen evolution in acidic aqueous solutions for metal electrowinning. The hybrid structure depends on the thermal decomposition temperature and time of the precursor solution containing Ru(III) and Ta(V), and nano RuO2 particles dispersed in amorphous Ta2O5 matrix are obtained in certain conditions. The hybrid oxide coated titanium anode shows excellent catalytic activity for oxygen evolution, resulting in a significant reduction in oxygen overpotential. This paper also presents the details of surface morphology of the oxide coating and the relationship between the preparation conditions and the morphological features.

2:20 PM  
Process of Improving the Flotation Using Ultrasonic Bombardment: Erivelto Souza1; Orimar Reis2; Denise Pereira3; Luís Borges2; Jeísa Rodrigues4; 1UFSJ; 2IFMG-OP; 3QTEC; 4UFOP/DEMIN
    The quality of the iron ore, over the decades of exploitation lowered, due to the reduction of the rich ores found at the beginning of the exploration. It resulted in ores with lower grades and more mixed with the gangue. Iron ore is processed after comminution and grinding, to have appropriate particle size and release the stages of flotation, which is divided generally in Rougher steps, Cleaner, Scavenger and Re-Cleaner. Flotation is a process that uses an ore slurry with additions of flocculants, surfactants, and other products. These substances are fundamental to the operation. However, it compromises of the reuse of the water. The proposal presented in this paper introduces a pre-treatment process of the pre-flotation material, still in Rougher step, which will increase its efficiency in such way that only one Cleaner step would be sufficient to generate a concentrate ready to be considered flotation of the final product.

2:40 PM  
Preliminary Analysis of the Application of Sensor Based Sorting on a Limestone Mine in the Region Caçapava do Sul, Brazil: Régis Paranhos1; Evandro Santos2; Carlos Petter3; Aaron Young3; Moacir Veras3; 1Unipampa; 2Dagoberto Barcelos SA; 3UFRGS
    This work seeks to evaluate the effect of the sorting of calcium/magnesium carbonates (limestone ores) through the use of X-ray and CCD camera sensors. Collection of the 17 samples used for this study was performed after primary crushing at a size range between 76 and 152 mm (3 to 6”). Sampling was intended to represent all of the possible variations of the ore and waste currently being extracted. For initial characterization, samples were washed and subjected to analysis by a handheld X-ray fluorescence spectrometer. Sensor based sorting tests were performed at the Federal University of Rio Grande do Sul (UFRGS) using a COMEX lab sorter. The lab sorter is comprised of a conveyor belt, mounted sensors, a data processing system, and a pneumatic flap system for the physical separation of the samples. Results of the X-ray separation showed that of the 12.2 kg of samples, 10.5 kg were sorted into product and only 1.7 kg were separated as waste. However, within the waste fraction, only 54.5% was considered waste, and likewise 7% of the product fraction was considered waste. When using the CCD camera, 100% of the ore fraction and 100% of the waste fractions were considered to be sorted correctly. While it is important to note that this is only a preliminary study analyzing the viability of implementation of the automatic sorting system, these preliminary results obtained with the use of both sensors were considered satisfactory.

3:00 PM  
The Compact Flowsheet for Ore Comminution and Processing: George Mover1; Volodymyr Golovan1; 1Black Iron Inc.
    The goal is to demonstrate an innovative approach to the development of the mining process flow sheet that enables a drastic reduction in the number of stages of ore beneficiation in comparison to the conventional plants. The authors propose a "compact process flow" utilizing VRM (Vertical Roll Mill). This represents a fundamental departure from the standard flow chart while reducing cost and improving quality of concentrate. The ball mills currently used do not ensure proper liberation of ore grains and have a poor power consumption performance. All finely disseminated ores containing metals and industrial minerals require extra grinding to a particle size that allows to liberate the targeted component. In VRM ore is crushed to provide nearly full liberation of ore grains. The use of VRM represents an essential change in the way how the processing plants are designed in terms of their capital and operating costs, energy savings and environmental protection.