Investigating of Nitric Acid Leaching of High-Sulfur Copper Concentrate

This article describes the problems of deterioration of the quality of processed raw materials due to depletion of mineral resources. It is proposed to use nitric acid for the processing of complex refractory low-grade concentrates containing non-ferrous and noble metals. It was found that the studied concentrate contains: sphalerite (26.9 %), pyrite (22.0 %), chalcopyrite (19.9 %), silica (13.9 %), alumina (5.5 %), galena (1.7 %), oxidized forms of iron (Fe2O3) (12 %). Gold and silver are associated with sulfide minerals. Typical reactions of interaction of these minerals with nitric acid are considered. A sufficiently high thermodynamic probability of these reactions in a wide temperature range is established. With the use of mathematical methods, the optimal conditions of the process of nitric acid leaching are selected: the ratio of L:S = 5:1; the concentration of nitric acid 10 mol/L; the duration of the process is 60 minutes. In this case, the extraction of copper, zinc, iron and sulfur into the solution was 99.00 %, 99.84 % 98.60 %, 88.51 %, respectively.

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Research of Polymetallic Sulfide Industrial Waste Nitric Acid Treatment

KnE Materials Science ◽

10.18502/kms.v2i2.966 ◽

2017 ◽

Vol 2 (2) ◽

pp. 174

Author(s):

Rogozhnikov D.A. ◽

Dizer O.A. ◽

Shoppert A.A.

Keyword(s):

Nitric Acid ◽

Industrial Waste ◽

Mutual Influence ◽

Acid Leaching ◽

Raw Material ◽

X Ray Diffraction ◽

Mathematical Methods ◽

X Ray ◽

Nitric Acid Leaching ◽

Kinetic Features

<p>Thermodynamic and kinetic features studies of polymetallic sulfide industrial waste nitric acid leaching were carried out. Elemental and phase composition of investigated raw material were studied with X-ray diffraction and electron microscopy methods. Calculations of the Gibbs energy change for the likely reactions of sulfide minerals with nitric acid were performed. In order to determine the most probable conditions of the sulfide industrial waste leaching in nitric acid, as well as the mutual influence of the produced pulp components on the performance of the process, the kinetics evaluation of multicomponent sulfide industrial waste in a nitric medium was studied using mathematical methods.</p>

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Polymetallic Ore Concentration Middlings Nitric Acid Leaching Kinetics

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.265.1065 ◽

2017 ◽

Vol 265 ◽

pp. 1065-1070 ◽

Cited By ~ 5

Author(s):

D.A. Rogozhnikov ◽

B.V. Kolmachikhin

Keyword(s):

Nitric Acid ◽

Nitric Acid Concentration ◽

Acid Leaching ◽

Numerical Differentiation ◽

Phase Reaction ◽

Leaching Kinetics ◽

Reaction Products ◽

Mathematical Methods ◽

Kinetic Evaluation ◽

Nitric Acid Leaching

The purpose of this work is the kinetic evaluation of reactions occurring during nitric acid leaching of pollymetallic sulfide middlings, for the most complete translation of copper, zinc and sulfur in solution and concentration of precious metals in residue. Methodology is pollymetallic sulfide middlings nitric acid leaching kinetics were studied using mathematical methods such as the experimental data numerical differentiation. Relevance/value is the main sulfide minerals kinetic characteristics were obtained for the studied materials, including the rate of the process, order of reaction, the rate constant for the forward and reverse reaction. Findings are the rate of the process is limited by kinetics. The calculated values of kinetic parameters showed that the process kinetics are influenced by such factors as the nature of leachable sulfide, nitric acid concentration, the surface area of the solid sulfide, the system approaches equilibrium at saturation of the liquid phase reaction products.

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On kinetics of impurity extraction from iron concentrate obtained by rough copper concentrate hydrometallurgical processing

Proceedings of Irkutsk State Technical University ◽

10.21285/1814-3520-2020-5-1150-1158 ◽

2020 ◽

Vol 24 (5) ◽

pp. 1150-1158

Author(s):

Lyutsiya Karimova ◽

◽

Tagir Khazhimukhametov ◽

Yerlan Kairalapov ◽

Alexander Yun ◽

...

Keyword(s):

Nitric Acid ◽

Production Process ◽

Copper Sulfide ◽

Raw Materials ◽

Acid Leaching ◽

High Quality ◽

X Ray ◽

Iron Concentrate ◽

Nitric Acid Leaching ◽

Sulfide Concentrate

The purpose of the paper is to study the physical and chemical features of high-quality iron concentrate precipitation from nitric acid leaching solutions of low-grade copper-sulfide raw materials, and to obtain a highly profitable product which is suitable for direct processing at ferrous metallurgy enterprises. To conduct the experiments on obtaining impurity rich and depleted iron concentrate a hydrolytic precipitate containing 54.6% iron and numerous impurities obtained as a result of processing of nitric acid leaching solutions of rough copper sulfide concentrate from the Zhezkazgan deposit is used. Analytical studies of initial materials and resulting products of the processes under investigation are conducted using the modern certified methods including the x-ray spectral, x-ray phase, atomic absorption analysis, mass spectrometry method with inductively coupled plasma. We have obtained a high-quality iron concentrate containing minimal amounts of silicon, aluminum, phosphorus and sulfur as well as partial and generalized equations that give an idea of the influence of the studied factors on the indicators of the iron concentrate production process. The apparent activation energy of the process has been calculated - 46.77 kJ/mol. It probably indicates the presence of diffusion complications caused by the formation of solid products passivating the surface of the material being dissolved. The principal possibility of obtaining high-quality iron concentrate from processing poor copper-sulfide concentrate middlings of the Zhezkazgan deposit is shown. The mathematical processing of experimental data has resulted in the determination of equations that characterize the degree of influence of the studied factors on the process indicators. It is found out that the production process of the saleable iron concentrate proceeds in the mode of diffusion restrictions. It is the first time, when multivariate generalized dependencies are obtained for the process under consideration and their analytical transformations are performed. These methods can be used to study the analogous processing of similar metallurgical raw materials.

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Nitric Acid Leaching of Copper-Zinc Sulfide Middlings

Metallurgist ◽

10.1007/s11015-016-0278-7 ◽

2016 ◽

Vol 60 (1-2) ◽

pp. 229-233 ◽

Cited By ~ 15

Author(s):

D. A. Rogozhnikov ◽

S. V. Mamyachenkov ◽

O. S. Anisimova

Keyword(s):

Nitric Acid ◽

Zinc Sulfide ◽

Acid Leaching ◽

Nitric Acid Leaching ◽

Copper Zinc

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Pressure nitric acid leaching of alkali-pretreated low-grade limonitic laterite

Rare Metals ◽

10.1007/s12598-014-0432-y ◽

2015 ◽

Vol 34 (1) ◽

pp. 64-70

Author(s):

Yong-Lu Zhang ◽

Cheng-Yan Wang ◽

Yong-Qiang Yang ◽

Fei Yin ◽

Bao-Zhong Ma

Keyword(s):

Nitric Acid ◽

Acid Leaching ◽

Low Grade ◽

Nitric Acid Leaching

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Obtaining of High Quality Iron Oxide from Nitric Acid Leaching Solution

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.299.1128 ◽

2020 ◽

Vol 299 ◽

pp. 1128-1133

Author(s):

Andrey A. Shoppert ◽

Denis A. Rogozhnikov ◽

Y.E. Agapitov

Keyword(s):

Iron Oxide ◽

Nitric Acid ◽

Copper Content ◽

Acid Leaching ◽

Low Grade ◽

Ferrous Ions ◽

High Quality ◽

Nitric Acid Leaching ◽

Promising Source ◽

Pregnant Solution

Low grade copper concentrate is a promising source for the future recovery of copper and other valuable components by nitric acid leaching, which leads to a formation of iron rich pregnant solution. In this study a method of producing of high-quality iron oxide from the pregnant solution by precipitation of jarosite with subsequent conversion of jarosite into magnetite under alkaline conditions in the presence of ferrous ions was explored. The degree of iron extraction was 87.4%, the copper content in the magnetite was 0.06% under the following optimal conditions of jarosite precipitation: precipitation time 6 h, initial pH 1.5, seed amount 60 g/L. However, to obtain this purity, the copper content in the pregnant solution should be less than 0.5 g/L, and as a seed, it is necessary to use a well-crystallized jarosite with a low content of impurities.

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Thermodynamics of Copper Arsenious Raw Materials Dissolution in Nitric Acid

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.316.678 ◽

2021 ◽

Vol 316 ◽

pp. 678-683

Author(s):

Oleg A. Dizer ◽

Denis A. Rogozhnikov ◽

Stanislav S. Naboichenko

Keyword(s):

Nitric Acid ◽

Equilibrium Distribution ◽

Raw Materials ◽

Acid Leaching ◽

Raw Material ◽

Reaction Products ◽

Liquid Equilibrium ◽

Nitric Acid Leaching ◽

Hydrometallurgical Method ◽

Solid Liquid

This article describes thermodynamic study of hydrometallurgical method for processing of copper arsenious gold-containing raw material. Chemical and phase composition of the material were researched. Calculations of the Gibbs energy change were conducted for possible reactions of the main minerals, present in the raw material, with nitric acid. Eh-pH diagrams and solid/liquid equilibrium distribution diagrams, which were constructed in order to confirm the possibility of obtaining the required reaction products through nitric acid leaching of the studied raw material.

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