Pressure Leaching of Chalcopyrite Concentrate: Ultra-Fine Milling as Process Acceleration Method

2020 ◽  
Vol 299 ◽  
pp. 1109-1114
Author(s):  
Aleksei Kritskii ◽  
Kirill Karimov ◽  
Stanislav Naboichenko
Keyword(s):  
Particle Size ◽  
Size Class ◽  
Pressure Leaching ◽  
Porphyry Deposits ◽  
Acceleration Method ◽  
Oxidative Leaching ◽  
Chalcopyrite Concentrate ◽  
Significant Intensification ◽  
Fine Milling ◽  
Partial Oxygen

Ural enrichment plants processing copper-porphyry deposits are produced chalcopyrite concentrates of the following chemical composition, %: 21.5 Cu, 0.1 Zn, 26.59 S, 24.52 Fe, 0.05 Pb, 0.04 Ni, 16.28 SiO2 [1]. According to previous studies [2, 3, 21], such concentrates can be effectively treated using pressure oxidative leaching (POX). At temperature of 190–200 °C, partial oxygen pressure 4–6 bar and [H2SO4] = 15–30 g / L during 100-120 min about 98 % Cu was extracted. In this paper, an inluence of chalcopyrite concentrate preliminary grinding on efficiency of the POX stage was studied. It was found that even the finest grinding of the particle size class P80 = 13 μm does not lead to significant intensification of process kinetics.

Pressure Leaching of Chalcopyrite Concentrate: Iron Removal from Leaching Residues

2020 ◽  
Vol 299 ◽  
pp. 1052-1057
Author(s):  
Aleksei Kritskii ◽  
Kirill Karimov ◽  
Stanislav Naboichenko
Keyword(s):  
Sulfuric Acid ◽  
High Temperature ◽  
Materials Processing ◽  
Pressure Leaching ◽  
Acid Media ◽  
Autoclave Treatment ◽  
Oxidative Leaching ◽  
Chalcopyrite Concentrate ◽  
Leaching Residue ◽  
By Products

Autoclave oxidative leaching is one of the most promising hydrometallurgical approaches for copper suplhide materials processing. In previous studies [2–4], the possibility of an efficient autoclave treatment of chalcopyrite concentrate was confirmed. The concentrate has the following chemical composition, %: 21.5 Cu, 0.1 Zn, 26.5 S, 24.5 Fe, 0.05 Pb, 0.04 Ni, 16.2 SiO2 [1]. At high temperature conditions (190–200 °C; 4–6 bar) in sulfuric-acid media during 100–120 min about 98% Cu was extracted. A leaching residue after POX (POX-cake) contained the following compounds, %: 55 Fe2O3, 40 SiO2, 4 MeS2/MeS. Current paper presents the results on purification of POX-cakes from iron by autoclave treatment. Futher ways for by-products (SiO2-cake and FeSO4-solution) processing are sugested.

scholarly journals An Alternative Process for Leaching Chalcopyrite Concentrate in Nitrate-Acid-Seawater Media with Oxidant Recovery

Metals ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 518 ◽  
Author(s):  
César I. Castellón ◽  
Pía C. Hernández ◽  
Lilian Velásquez-Yévenes ◽  
María E. Taboada
Keyword(s):  
Particle Size ◽  
Sulfuric Acid ◽  
Alkaline Solution ◽  
Sodium Nitrite ◽  
Sodium Nitrate ◽  
Room Temperature ◽  
Leaching Test ◽  
Copper Concentrate ◽  
Leaching Process ◽  
Chalcopyrite Concentrate

An alternative copper concentrate leaching process using sodium nitrate and sulfuric acid diluted in seawater followed by gas scrubbing to recover the sodium nitrate has been evaluated. The work involved leaching test carried out under various condition by varying temperature, leaching time, particle size, and concentrations of NaNO3 and H2SO4. The amount of copper extracted from the chalcopyrite concentrate leached with seawater, 0.5 M of H2SO4 and 0.5 M of NaNO3 increased from 78% at room temperature to 91% at 45 °C in 96 h and 46 h of leaching, respectively. Gas scrubbing with the alkaline solution of NaOH was explored to recover part of the sodium nitrate. The dissolved salts were recovered by evaporation as sodium nitrate and sodium nitrite crystals.

Removal of Iron from Metallurgical Grade Silicon with Pressure Leaching

2011 ◽  
Vol 675-677 ◽  
pp. 873-876 ◽  
Author(s):  
Ke Qiang Xie ◽  
Zhan Liang Yu ◽  
Wen Hui Ma ◽  
Yang Zhou ◽  
Yong Nian Dai
Keyword(s):  
Particle Size ◽  
Reaction Time ◽  
Removal Efficiency ◽  
Acid Concentration ◽  
Operating Conditions ◽  
Raw Material ◽  
Optimum Operating ◽  
Pressure Leaching ◽  
Metallurgical Grade Silicon ◽  
Grade Silicon

In this paper, removal of iron from metallurgical grade silicon with pressure leaching is carried out. We investigated the factors such as the concentration of hydrochloric, particle size of raw material ground, temperature, pressure and reaction time, which influenced on the removal of iron. The results show that the optimum operating conditions for pressure leaching in hydrochloride are: acid concentration 4 mol/L, diameter for raw material less than 50 μm, leaching temperature 160 0C，leaching pressure 2.0 MPa, leaching time 2.0 h. The content of iron residual in MG-Si powder was reduced to about 200 ppmw. The removal efficiency of iron is up to 90.90 %.

Thermodynamic and Kinetic Study of Leaching Magnesia from Natural Magnesites by Carbon Dioxide

2011 ◽  
Vol 309-310 ◽  
pp. 261-264 ◽  
Author(s):  
S. Klochkovskii ◽  
A. Smirnov ◽  
U. Shabalina
Keyword(s):  
Carbon Dioxide ◽  
Particle Size ◽  
Kinetic Study ◽  
Calcination Temperature ◽  
High Purity ◽  
Magnesium Carbonate ◽  
Carbon Dioxide Partial Pressure ◽  
Pressure Leaching ◽  
Translation Process ◽  
Carbon Dioxide Pressure

The applicability of carbon dioxide pressure leaching for the extraction of high purity magnesia from natural magnesites has been investigated. Factors which have influence on the magnesia recovery such as time, temperature, pressure, particle size and calcination temperature have been studied. Optimum values were determined: calcination temperature was in the range 650 – 750 0C, time of the calcination was approximately 5 – 3 hours; carbon dioxide partial pressure leaching for the extraction of magnesia was about 3 bar; particle size was between 0,2 – 0,6 mm. A kinetic study of carbonation of MgO has been investigated at leaching temperature from 00C to 50 0C. Two processes were observed: the formation of a magnesium bicarbonate solution and the precipitation of magnesium carbonate. Our research has determined that the concentration of impurities in magnesium carbonate is virtually no different from their concentration in natural magnesites. Apparently, the formation of magnesium carbonate proceeds without destruction of structure. So the extraction of high purity magnesia from natural magnesites by carbon dioxide is only possible using magnesium bicarbonate. It is necessary to optimize the translation process of magnesium in solution and the technology of extraction of pure MgO from it to generate high purity magnesium on an industrial scale.

Corrigenda - The effect of Aeolian accessions on soil development on granitic-rocks in south eastern Australia. I. Soil morphology and particle-size distributions

Soil Research ◽  
1988 ◽  
Vol 26 (1) ◽  
pp. 1
Author(s):  
PH Walker ◽  
CJ Chartres ◽  
J Hutka
Keyword(s):  
Particle Size ◽  
Size Class ◽  
Granitic Rocks ◽  
Soil Morphology ◽  
South Eastern ◽  
Particle Size Data ◽  
Eastern Australia ◽  
Size Mode ◽  
Single Size ◽  
South Eastern Australia

Four Alfisols in south-eastern Australia were studied to determine their genesis with special reference to textural profile development and aeolian accession. Sampling sites were located in erosional terrain developed from granitic rocks of similar composition and in hillcrest positions to reduce the chance that colluvial deposition had affected pedogenesis. The sampling transect was placed in such a way that differences in regional aeolian accession could be reflected in soil properties. The chemical and physical characteristics of these soils indicated that strong leaching had been important in their genesis. Detailed particle-size data confirmed that the coarsest fractions in all profiles were derived from weathered granite. The A horizons tended to have a single size mode in the sand range and very little clay-size material. The B horizons tended to be bimodal with the greatest amount of clay in the 0.12-0.06 �m size class and a mode in the sand range close to that of the A horizons. The appearance of a peak in the 62-31 �m size class, which is progressively stronger in the western sites, probably relates to a fine aeolian accession which has penetrated the B and C horizons. The amount of clay contributed by aeolian accession to textural B horizons is unknown. At erosional sites in south-eastern Australia, where the probability of colluvial and fluvial sedimentary layering is minimal, aeolian accession of fine fractions has complicated the interpretation of pedogenesis.

LABORATORY AND THEORETICAL STUDIES OF COAL SAMPLES ON THE ASH CONTENT AND THE CATEGORY OF PROCESSING

2020 ◽  
Vol 5 (8(77)) ◽  
pp. 29-35
Author(s):  
N.A. Kurmazova ◽  
A.N. Hramov
Keyword(s):  
Particle Size ◽  
Total Yield ◽  
Ash Content ◽  
Size Class ◽  
Open Pit ◽  
Theoretical Studies ◽  
Density Index

In this article, gravity studies of coal samples from the Vostochny open-pit of the Tataurovskoye deposit are carried out. A diagram of the ash content of the samples according to the density index of the material is shown, the ash content of the samples is shown graphically according to the particle size. Formulas are given for calculating the average ash content, the total yield of floated and settled fractions. Also, studies and calculations of samples of each density were carried out depending on the particle size class. As a result of calculating the yield of the fraction for each density, studies on the washability of samples were carried out and the curves of washability are graphically presented. According to GOST, the sample washable category was identified.

scholarly journals Fine Comminution of Pine Bark: How Does Mechanical Loading Influence Particles Properties and Milling Efficiency?

2019 ◽  
Vol 6 (4) ◽  
pp. 102 ◽  
Author(s):  
Karine Rajaonarivony ◽  
Xavier Rouau ◽  
Komlanvi Lampoh ◽  
Jean-Yves Delenne ◽  
Claire Mayer-Laigle
Keyword(s):  
Particle Size ◽  
Energy Consumption ◽  
Ultrafine Particles ◽  
Plant Biomass ◽  
Pine Bark ◽  
Coarse Particles ◽  
Attrition Mill ◽  
Attrition Milling ◽  
Process Energy ◽  
Fine Milling

The use of lignocellulosic plant biomass as an alternative to fossil feedstocks for chemistry, energy and materials often involves an intense dry comminution step, for which the energy consumed can vary significantly according to the process parameters, the particle size targeted, and the properties of the biomass. Here we studied the fine milling of maritime pine bark in an impact-mill configuration and in an attrition-mill configuration. The properties of the resulting powders (particle size distribution, particle shape, specific surface area, agglomeration level) obtained in each configuration were compared in relation to process energy consumption. Results evidenced that the agglomeration phenomena drive milling efficiency and limit the possibilities for reaching ultrafine particles. Interestingly, impact loading proved more effective at breaking down coarse particles but tended to generate high agglomeration levels, whereas attrition milling led to less agglomeration and thus to finer particles.

Determining the Best Particle Size-Class for Flotation of a High Ash Coal

2017 ◽  
Vol 40 (11) ◽  
pp. 755-765 ◽  
Author(s):  
Saroj Kumar Sahoo ◽  
Nikkam Suresh ◽  
Atul Kumar Varma
Keyword(s):  
Particle Size ◽  
Size Class ◽  
High Ash Coal
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