scholarly journals Atmospheric leaching of copper from oxide-sulfide ore using sulfuric acid

Tehnika ◽  
2020 ◽  
Vol 75 (2) ◽  
pp. 172-175
Author(s):  
Milisav Ranitović ◽  
Željko Kamberović ◽  
Marija Korać ◽  
Dragana Radovanović ◽  
Miroslav Sokić
Keyword(s):  
Sulfuric Acid ◽  
Sulfide Ore ◽  
Atmospheric Leaching

scholarly journals OBTAINING SOME THERMOD AINING SOME THERMODYNAMIC PARAMETERS CONTAINING ME AINING METACRYLATE AND ALL TE AND ALLYL GROUPS CON YL GROUPS CONTAINING IN COMPOSITION

2019 ◽  
Vol 2019 (1) ◽  
pp. 69-75
Author(s):  
Kh Akhmedov ◽  
Zh Bekpulatov ◽  
G Solijonova ◽  
N Sharifova
Keyword(s):  
Sulfuric Acid ◽  
Acid Treatment ◽  
Noble Metals ◽  
Material Composition ◽  
Rational Analysis ◽  
Sulfuric Acid Treatment ◽  
Chemical Assay ◽  
Sulfide Ore ◽  
Content Of Gold ◽  
Gold Bearing

The article discusses the results of studying the material composition and the development of technology for processing gold-bearing sulfide ore samples. The material composition of the ore samples was studied by spectral, chemical, assay and rational analysis of gold and silver. Based on a study of the material composition of the ore samples, the following conclusions were made: gold and silver are the industry's most valuable components. It is shown that the use of sulfuric acid treatment of a cinder of graviofloraf concentrate can allow to improve the technological performance of the process. As a result of the mixture of gravio-flotation concentrate after sulfuric acid treatment drying, grinding to a size of 95% CL. -0,074+0 mm and subjected to sorption cyanidation. In the initial cake, the content of gold -77.83 u. e. and silver-16.3 u. e., the concentration of sodium cyanide 0.15%, the ratio W:t=2:1; resin AM-2B-5% of the pulp volume, the duration of cyanidation 36 hours.the Content in the tailings of cyanidation of gold - 6.5 u. e., and silver - 4.8 u. e. the Extraction of noble metals in solution and on the resin was 91.65 and 70.55%, respectively. Through extraction of 87.63% gold and 55.6% silver from ore.

Atmospheric leaching characteristics of nickel and iron in limonitic laterite with sulfuric acid in the presence of sodium sulfite

2015 ◽  
Vol 78 ◽  
pp. 38-44 ◽  
Author(s):  
Jun Luo ◽  
Guanghui Li ◽  
Mingjun Rao ◽  
Zhiwei Peng ◽  
Yuanbo Zhang ◽  
...  
Keyword(s):  
Sulfuric Acid ◽  
Sodium Sulfite ◽  
Leaching Characteristics ◽  
Atmospheric Leaching

scholarly journals Industrial Heap Bioleaching of Copper Sulfide Ore Started with Only Water Irrigation

Minerals ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1299
Author(s):  
Yan Jia ◽  
Heyun Sun ◽  
Qiaoyi Tan ◽  
Jingyuan Xu ◽  
Xinliang Feng ◽  
...  
Keyword(s):  
Sulfuric Acid ◽  
Copper Sulfide ◽  
Pyrite Oxidation ◽  
Sulfide Mineral ◽  
Copper Sulfides ◽  
Sulfide Ore ◽  
Heap Bioleaching ◽  
Exogenous Addition ◽  
Irrigation Solution ◽  
Copper Sulfide Ore

Sulfuric acid solution containing ferric iron is the extractant for industrial heap bioleaching of copper sulfides. To start a heap bioleaching plant, sulfuric acid is usually added to the irrigation solution to maintain adequate acidity (pH 1.0–2.0) for copper dissolution. An industrial practice of heap bioleaching of secondary copper sulfide ore that began with only water irrigation without the addition of sulfuric acid was successfully implemented and introduced in this manuscript. The mineral composition and their behavior related to the production and consumption of sulfuric acid during the bioleaching in heaps was analyzed. This indicated the possibility of self-generating of sulfuric acid in heaps without exogenous addition. After proving by batches of laboratory tests, industrial measures were implemented to promote the sulfide mineral oxidation in heaps throughout the acidifying stages, from a pH of 7.0 to 1.0, thus sulfuric acid and iron was produced especially by pyrite oxidation. After acidifying of the heaps, adapted microbial consortium was inoculated and established in a leaching system. The launch of the bioleaching heap and finally the production expansion were realized without the addition of sulfuric acid, showing great efficiency under low operation costs.

Column Bioleaching of a Saline, Calcareous Copper Sulfide Ore

2017 ◽  
Vol 262 ◽  
pp. 7-11 ◽  
Author(s):  
Eva Pakostova ◽  
Barry M. Grail ◽  
D. Barrie Johnson
Keyword(s):  
Sulfuric Acid ◽  
Cost Effective ◽  
Environmentally Benign ◽  
Base Metals ◽  
Soluble Salts ◽  
Horizon 2020 ◽  
Sulfide Ore ◽  
Copper Sulfide Ore ◽  
The Eu

“Deep in situ biomining”, widely considered to be a potentially environmentally-benign and cost effective biotechnology for extracting and recovering base metals from deep-buried base metal deposits, is being developed within the EU Horizon 2020 project “BioMOre”. Data are presented from non-aerated column experiments in which a saline, calcareous copper-rich ore (kupferschiefer) was subjected to a three-stage eaching protocol: (i) with water, to remove soluble salts; (ii) with sulfuric acid, to remove calcareous minerals and other acid-soluble salts; (iii) indirect bioleaching with a microbiologically-generated ferric iron lixiviant. Sequential leaching with water and acid removed ~85% of the chloride prior to bio-processing, while ~13% of the copper present in the ore was leached using sulfuric acid, and a further 39 - 59% by the lixiviant.

Preparation of Thin Cadmium Telluride Samples for Electron Microscope Studies

1974 ◽  
Vol 32 ◽  
pp. 548-549
Author(s):  
T. J. Magee ◽  
J. Peng ◽  
J. Bean
Keyword(s):  
Electron Microscope ◽  
Sulfuric Acid ◽  
Solid State ◽  
Sample Preparation ◽  
Cadmium Telluride ◽  
Potassium Dichromate ◽  
Optical Components ◽  
The Past ◽  
Solid State Devices

Cadmium telluride has become increasingly important in a number of technological applications, particularly in the area of laser-optical components and solid state devices, Microstructural characterizations of the material have in the past been somewhat limited because of the lack of suitable sample preparation and thinning techniques. Utilizing a modified jet thinning apparatus and a potassium dichromate-sulfuric acid thinning solution, a procedure has now been developed for obtaining thin contamination-free samples for TEM examination.

Physical, Chemical, and Crystallographic Characterization of Anodic Coatings on High Strength Aluminum Base Alloys

1976 ◽  
Vol 34 ◽  
pp. 636-637
Author(s):  
R. E. Herfert ◽  
N. T. McDevitt
Keyword(s):  
Sulfuric Acid ◽  
Salt Spray ◽  
High Strength ◽  
Environmental Stability ◽  
Anodic Films ◽  
Sodium Dichromate ◽  
Corrosion Resistant ◽  
Aerospace Applications ◽  
Bond Strengths ◽  
Adhesive Bonded Joints

Durability of adhesive bonded joints in moisture and salt spray environments is essential to USAF aircraft. Structural bonding technology for aerospace applications has depended for many years on the preparation of aluminum surfaces by a sulfuric acid/sodium dichromate (FPL etch) treatment. Recently, specific thin film anodizing techniques, phosphoric acid, and chromic acid anodizing have been developed which not only provide good initial bond strengths but vastly improved environmental durability. These thin anodic films are in contrast to the commonly used thick anodic films such as the sulfuric acid or "hard" sulfuric acid anodic films which are highly corrosion resistant in themselves, but which do not provide good initial bond strengths, particularly in low temperature peel.The objective of this study was to determine the characteristics of anodic films on aluminum alloys that make them corrosion resistant. The chemical composition, physical morphology and structure, and mechanical properties of the thin oxide films were to be defined and correlated with the environmental stability of these surfaces in humidity and salt spray. It is anticipated that anodic film characteristics and corrosion resistance will vary with the anodizing processing conditions.

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