scholarly journals LOCATION PECULIARITIES AND EVOLUTION OF KOSHKARCHAY COPPER-PORPHYRE FIELD (LESSER CAUCASUS, AZERBAIJAN)

2021 ◽  
pp. 41-52
Author(s):  
M. Mansurov
Keyword(s):  
Precious Metals ◽  
Mineral Resources ◽  
Structure Evolution ◽  
Gold Content ◽  
Complex Ions ◽  
Forming Process ◽  
Study Results ◽  
Lesser Caucasus ◽  
Major Factors ◽  
Embedded Type

The paper deals with peculiarities of location and evolution features of Koshkarchay copper-porphyritic field of Murovdagh ore province. Major factors of concentration of copper-porphyritic mineralization in rocks of gabbro-diorite-granodiorite formation has been revealed. It has been established that the structure of this ore region was formed as a result of successive alteration of some deformation stages accompanied by development of fractures in intrusive massive, by dike intrusions, blocks displacements along faults and the fractures composed of various mineral associations. It has been made clear that the copper-porphyritic mineralization is related to the wide halo of hydro-thermal-deformed rocks, frequently observed with clearly outlined ore-metasomatic zones. The general column of metasomatic zonation within the limits of ore region and fields are expressed by successive alteration of the following metasomatic zones: quartz → kalifeldspath → quartz-sericite → argillizated → propylitic. Based on structural-morphological features it can be stated that mineralization in Koshkarchay field is stockwork-vein deposit of embedded type in which the impregnations dominate over veins. The major useful component is copper. Its percentage within stockwork body varies within the broad range – from 0.2 to 2.5 %, with average 0.41 %. Among the mineral resources significantly impacting the importance of the field the molybdenum and precious metals can be indicated. In some intervals the average gold content is 2.0 grams/ton and higher. High silver content was also identified and its value reaches 30-45 grams/ton and this may positively impact the whole value of the field. Results of factor analysis of well data allowed identifying geochemical associations for localization of the areas of mineralization at various stages of evolution of porphyritic-epithermal system. Values of Ф1 factor correlate with quantity of chalcopyrite, bornite and pyrite and from this it can be inferred the tie of geochemical association of Cu (Mo, Pb, Sb) to the early chalcopyrite-bornite-pyrite mineralization of porthyric stage of structure evolution. Values of Ф2 factor referring to the association Mo (Cu, Pb, Co), statistically are related to the content of chalcopyrite and molybdenite, which are the main mineral paragenesis of copper-molybdeneporphyritic mineralization. Thermal-pressure and chemical methods applied for researches on impregnations of ore of pyrite-chalcopyrite, galenitesphalerite-chalcopyrite stages in quartz made it possible to describe the fluid mode of ore formation in this field. Ore-forming hydrothermal solutions by the data of researches on fluid impregnations were the chloride-sodium type, salt concentrations varied from 20 to 30 mass % – eqv. NaCl. Ore components were transferring by these solutions in a form of complex ions containing chlorides of Na and K, rarely sulfates and carbonates. Ore forming process was going under temperatures of 350-2000 С. The certain range of physical and chemical parameters and chemical composition of ore forming fluid corresponds to each type of mineralization. The study results enabled us to define temperatures of homogenization of impregnations and evaluate temperatures of fluids during mineralization at each stage, as well as to define concentrations of major salt components. Complexity of targets evidence high perspectives of copper-porphyritic areas and areas outlined in a range of perspective ore fields.

Gravity-flotation gold-bearing ore concentration

2021 ◽  
Vol 1 (1) ◽  
pp. 4-15
Author(s):  
P. K. Fedotov ◽  
A. E. Senchenko ◽  
K. V. Fedotov ◽  
A. E. Burdonov
Keyword(s):  
High Performance ◽  
Gold Recovery ◽  
Gold Content ◽  
Flotation Concentrate ◽  
Stage Scheme ◽  
Study Results ◽  
Ore Minerals ◽  
Concentrate Yield ◽  
Flotation Concentration ◽  
Gold Bearing

The paper focuses on the study of the gold-bearing ore dressability. According to technological research, the average gold content is 11.88 g/t. The silver content is insignificant – 2.43 g/t. Main ore minerals in the sample are pyrite and pyrrhotite. According to mineralogical and X-ray structural analysis, the average content of these minerals in the ore is about 6 % (in total). Main rock-forming minerals of the original ore are: quartz (60.1 %), quartz-chlorite-mica aggregates (3.8 %), carbonates (7.1 %). According to the study results, it was found that the gold recovery in the GRG test was 72.75 % with a total concentrate yield of 1.34 % and a content of 664.78 g/t. At the same time, the gold content in tailings was 3.29 g/t. A stage test showed that it is advisable to use a two-stage scheme for ore processing by gravity technology only. The first stage is in the grinding cycle with the 60–70 % ore size, and the second stage is with the final classifier overflow size of 90 % –0.071 mm. Centrifugal separation has high performance as a free gold recovery operation in the grinding cycle. A concentrate with a gold content of 2426 g/t was obtained with a yield of 0.31 % and a recovery of 63.74 %. The beneficiation of first stage tailings ground to 90 % –0.071 mm at the KC-CVD concentrator (modeling) made it possible to extract gold into a total gravity concentrate (KC-MD + KC-CVD) of 87.25 % with a concentrate yield of 22.63 %. The gold content in tailings was 1.97 g/t. The results of gravity and flotation concentration of the original ore indicate the feasibility of using a combined gravity-flotation technological scheme. In a closed experiment of the initial ore beneficiation according to the gravity-flotation scheme at a natural pH of the pulp (without adding acid), the following products were obtained: gravity concentrate with a gold content of 2426 g/t at a yield of 0.31 % and recovery of 64.06 %; flotation concentrate (after the II cleaning) with a gold content of 122 g/t at a yield of 2.90 % and recovery of 33.01 %; the total gold recovery in the gravity-flotation concentrate was 94.07 % with a yield of 3.21 % and an Au content of 345.87 g/t, the gold content in the flotation tailings was 0.72 g/t.

STALE GOLD-BEARING TAILINGS OF THE BALEIZOLOTO PLANT AND THE PROBLEM OF THEIR DISPOSAL

2021 ◽  
Vol 27 (4) ◽  
pp. 45-54
Author(s):  
G. Yurgenson ◽  
◽  
L. Shumilova ◽  
А. Khatkova ◽  
◽  
...  
Keyword(s):  
Negative Impact ◽  
Chemical Elements ◽  
Raw Materials ◽  
Precious Metals ◽  
Gold Content ◽  
Residential Areas ◽  
Extraction Technology ◽  
Useful Components ◽  
Technogenic Raw Materials ◽  
Gold Bearing

The relevance of the research is the need to recultivate the waste from the enrichment of gold-bearing ores that lie in the immediate vicinity of the residential areas of Baley city, which have a negative impact on the environmental situation in it, as well as to develop a technological approach to the extraction of gold and silver. The purpose of the study is to study the material composition and develop a technology for extracting precious metals. The object of the study is the stale tailings of the ZIF-1 plant “Baleizoloto”. The subject of the study is mineral composition of stale tailings, content of useful components and their extraction technology, the method and methodology presented by mineralogical and chemical analyses of enrichment tailings. Results. The analysis of the tailings dumps’ state of the gold recovery factories of the Baleizoloto plant was carried out. The contents of gold and other chemical elements, among which arsenic, zinc, copper, antimony, and lead predominate, were determined. The gold content prevails in the stale tailings of the ZIF-1 factory, which processed the ores of the Baley deposit, and is in the range of 1.09-1.37 g / t, on average – 1.17 g/t. This determines the prospects for their primary processing. The gold in the clay-sand fraction of the stale tailings is mainly found in thin accretions with quartz, carbonates, pyrite, arsenopyrite, sulfosols, and tellurides. The field of application is processing of technogenic raw materials. Conclusions. It was determined that the sizes of gold inclusions are in the range of 0.7-0.03 mm, the gold penetration varies from 63 to 91.15, and on average is 82.13; the main impurity in gold is silver with a content of 8.85-37%; the average silver content in the tailings of the ZIF-1 factory is 1.85 g/t; the recommended technological scheme for processing stale tailings of ZIF-1 of the Baleizoloto plant has been developed, including the following operations: photoelectron-activation preparation, pelletizing with active solution, heap leaching, two-stage sorption with bubbling with ozone

Influence of Gear Rim Deflections on Planetary Gear Set Behavior

2009 ◽  
Author(s):  
H. Ligata ◽  
A. Kahraman ◽  
A. Singh
Keyword(s):  
Deformable Body ◽  
Planetary Gear ◽  
Load Sharing ◽  
Ring Gear ◽  
Hoop Strain ◽  
Position Errors ◽  
Study Results ◽  
Planetary Gear Sets ◽  
Support Conditions ◽  
Major Factors

In this study, results of an experimental and theoretical study on the influence of rim thickness of the ring gear on rim deflections and stresses, and planet load sharing of a planetary gear set are presented. Experimental study consists of measurement of ring gear deflections and strains for gear sets having various numbers of planets, different ring gear rim thicknesses as well as various carrier pin hole position errors. Root and hoop strain gauges and displacement probes are placed at various locations so that the variations due to external splines of the stationary ring gear can also be quantified. A family of quasi-static deformable-body models of the test gear planetary gear sets is developed to simulate the experiments. The predictions and the measurements are compared to assess the accuracy of the models within wide ranges of parameters. Influence of rim thickness on ring gear stresses and deflections and planet load sharing are quantified together with the interactions between the rim flexibility and the spline conditions. The results from this study confirm that the ring gear deflections and the ring gear support conditions must be included in the design process as one of the major factors.

Study on the Regularity of the Center Quality of Cross Wedge Rolling Asymmetric Shaft Parts Based on Parity Wedge

2014 ◽  
Vol 488-489 ◽  
pp. 1125-1129
Author(s):  
Xue Dao Shu ◽  
Wen Ping Liu ◽  
Chao Cheng ◽  
Zhan Li ◽  
Wen Fei Peng ◽  
...  
Keyword(s):  
Systematic Study ◽  
Theoretical Foundation ◽  
Cross Wedge Rolling ◽  
Forming Process ◽  
Study Results ◽  
Technology Applications ◽  
Forming Angle ◽  
Core Part ◽  
Rolling Technology

In order to expand cross wedge rolling technology applications further and improving the quality of asymmetric shaft parts, this paper predicts the position of center defect location of Cross Wedge Rolling asymmetric shaft parts based on Parity Wedge by Normalized C & L criteria. On this basis, it conducted a systematic study on the effect of forming angle on quality of rolling core part. It has found that, during the forming process of Cross Wedge Rolling shaft parts, rolling center region was more prone to damage, and achieved the regularity of process parameters on the quality of core part. The study results lay the theoretical foundation for preventing defects effectively and improving quality of rolling core part.

The Space Quantitative Anomaly Seeking of Geochemical Elements Combination and Source Tracing Analysis

2013 ◽  
Vol 807-809 ◽  
pp. 2163-2169
Author(s):  
Guo Qiang Chen ◽  
Lai Jun Lu ◽  
Meng Xue Cao
Keyword(s):  
Spatial Distribution ◽  
Large Scale ◽  
Transport Theory ◽  
Mineral Resources ◽  
Forming Process ◽  
Intelligent Search ◽  
Abnormal Distribution ◽  
Source Tracing ◽  
Geological Conditions ◽  
Geochemical Elements

Abnormal analysis of geochemical elements is a significant link in the mineral resources prediction. Element anomaly often directly or indirectly reflects the existence of mineralization anomaly. Due to the polyphyleticism of the metallogenic material and ore-forming process is characterized by multiple stages. there are two type of the metallogenic elements ,i.e., main ore-forming elements and associated elements. Therefore, it presents different assemblage characteristics in the spatial distribution, which also exist in the abnormal distribution. The spatial distribution mechanism of the combination elements are relate to geological conditions and the property of the elements. Based on the geochemical and transport theory, we explore the space quantitative anomaly seeking model. Then we proposed a new method - source tracing analysis for the inference of ore-caused anomaly from the combination anomaly, and the criteria of the proposed method is given. It can realize the intelligent search of the middle-large scale mineral resources prediction target effectively.

Exergy as an Indicator for Resources Scarcity: The Exergy Loss of Australian Mineral Capital — A Case Study

2006 ◽  
Author(s):  
Alicia Valero ◽  
Antonio Valero ◽  
Inmaculada Arauzo
Keyword(s):  
Precious Metals ◽  
Mineral Resources ◽  
Exergy Loss ◽  
Lead And Zinc ◽  
Mining History ◽  
Australian Case ◽  
Ore Grades ◽  
Metal Equivalent

Over the span of the 20th century, the global demand for metals and minerals has increased dramatically. This is associated with a general trend of declining ore grades from most commodities, meaning higher quantities of ore needed to be processed and thus more energy. Hence, quantifying the loss of mineral capital in terms of mass is not enough since it does not take into account the quality of the minerals in the mine. Exergy is a better indicator than mass because it measures at the same time the three features that describe any natural resource: quantity, composition and a particular concentration. For the sake of better understanding the exergy results, they are expressed in tons of Metal equivalent, tMe, which are analogously defined to tons of oil equivalent, toe. The aim of this paper is 1) to show the methodology for obtaining the exergy loss of mineral resources throughout a certain period of time and 2) to apply it to the Australian case. From the available data of production and ore grade trends of Australian mining history, the tons of Metal equivalent lost, the cumulative exergy consumption, the exergy decrease of the economic demonstrated reserves and the estimated years until depletion of the main base-precious metals are provided, namely: for gold, copper nickel, silver lead and zinc.

scholarly journals The Main Innovations in Education: in Pursue of Aims of Bologna (1999) and Bergen (2005) Processes

2018 ◽  
Vol 2 (73) ◽  
Author(s):  
Laimutė Kardelienė ◽  
Vaiva Zuzevičiūtė
Keyword(s):  
Learning Outcomes ◽  
Curriculum Design ◽  
Knowledge Society ◽  
Physical Education Teachers ◽  
Global Level ◽  
Educational Impact ◽  
Study Results ◽  
Teachers And Students ◽  
Changing Roles ◽  
Major Factors

 In the last decade of the 20th century, the term knowledge society started to be used as a way to convey the development of contemporary humankind. The discourse of knowledge that become actualised in activity (i. e. competence) became the most influential one. Competence was titled to be one of the major factors for competiteveness, and therefore competence started to be highly valued in organisations. Organisations nowadays (due to demographic changes, and to the need to pursue competetiveness at the global level) are encouraged to employ more actively the “treasure within”, that is, the competence of employees. In this paper we aim to identify the main innovations of a professional in education in the framework of contemporary educational policy trends. There are several important innovations in education of professionals, and some of these innovations are directly related to the ideas that ground Bologna (1999) and Bergen (2005) processes. The important innovations in contemporary educational system concentrate on the increase of the cohesion between the changing world of activities and education. Therefore competences, study results (or learning outcomes), the changing roles of teachers and students, and also implications for curriculum design are emphasised in reforming education of professionals. It seems that competence-based studies promote modularization of the curriculum. Modularisation of study programmes is another innovation, as the importance of clearly stated study results (learning outcomes) is emphasised. Clear and measurable study results (learning outcomes) are linked to the competencies that should be achieved in a given period of time, or (and that is more common), after a certain educational impact is provided, and certain part of curriculum covered.Keywords: competence, study results, learning outcomes, innovation, education of physical education teachers. 

scholarly journals Closed-die Forging Technology and Numerical Simulation of Aluminum Alloy Connecting Rod

Open Physics ◽  
2019 ◽  
Vol 17 (1) ◽  
pp. 497-504
Author(s):  
Wei Zhang ◽  
Yandong Yu
Keyword(s):  
Aluminum Alloy ◽  
Flow Characteristics ◽  
Deformation Mode ◽  
Connecting Rod ◽  
Forming Process ◽  
Forming Load ◽  
Die Forging ◽  
Closed Die Forging ◽  
Study Results ◽  
Deformation Velocity

Abstract In order to improve quality and reveal the law of precision forging, closed-die forging technology is used in this paper to conduct a numerical analysis of the forming process of aluminum alloy connecting rod by the DEFORM software. Forming effects under different loading modes were acquired, and forming process, blank flow characteristics, stress-strain distribution and load-stroke curve characteristics were analyzed. Study results indicate that the forming effect under the loading mode featuring first movement of lateral punch and then movement of upper and lower punches is good with high quality forge piece and no defect, the closed-die forging technology of aluminum alloy connecting rod is reasonable and feasible. Under a certain deformation velocity and deformation mode, aluminum alloy connecting rod forming load firstly reduces and then increases, the forming load is in direct proportion to deformation velocity. When the forming process is finished, forming load reaches 130T, it accords with the production practice. The study results provide a certain reference for guiding the formulation of closed-die forging production technology of aluminum alloy connecting rods.

Accessing of Retrospective Information by the Ophthalmologists in India: A Study

2019 ◽  
Vol 9 (1) ◽  
pp. 25-31
Author(s):  
R. Govindarajan ◽  
S. Dhanavandan
Keyword(s):  
Information Retrieval ◽  
Health Information ◽  
Information Sources ◽  
Service Providers ◽  
Information Service ◽  
Rank Test ◽  
Cross Sectional ◽  
Review Articles ◽  
Study Results ◽  
Major Factors

Health information has high value in society. The accumulated health information empowers the health professionals to serve for millions of lives. The purpose of the study is to examine Ophthalmologists’ – Eye Doctors retrospective information retrieval behaviour. The study design is cross-sectional and convenience sampling method is adopted. A structured questionnaire was used to collect data. SPSS 18 PASW Statistical package was used for statistical analysis. Frequencies, percentages, Mann Whitney U test, Kruskal-Wallis test, Factor Analysis, Friedman test, Wilcoxon signed-rank test were used in the study. Around 633 ophthalmologists working in 47 academic eye hospitals from 16 states of India were included in the study. The study results revealed that the majority of the ophthalmologists prefer Review articles. The statistical test results showed up that the ophthalmologists’ retrospective information retrieval preferences differ by experience, institution type. The three major factors of ophthalmologists’ retrospective information retrieval behaviour were identified as Related Resources, Experts / Peers and Information Sources. The Related Resources factor was significantly higher than the Experts / Peers factor and Information Sources factor. The ophthalmic community should motivate the ophthalmologists to publish more review articles. The ophthalmic libraries and information service providers can add a list of related literature for each of their resources.

Exploring the factors influencing adoption of health-care wearables among generation Z consumers in India

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Bishwajit Nayak ◽  
Som Sekhar Bhattacharyya ◽  
Saurabh Kumar ◽  
Rohan Kumar Jumnani
Keyword(s):  
Health Care ◽  
Structural Equation ◽  
Healthy Lifestyle ◽  
Content Type ◽  
Adoption Theory ◽  
Generation Z ◽  
Factors Influencing ◽  
Study Results ◽  
Confirmatory Factor ◽  
Major Factors

Purpose The purpose of this study is to identify the major factors influencing the adoption of health-care wearables in generation Z (Gen Z) customers in India. A conceptual framework using push pull and mooring (PPM) adoption theory was developed. Design/methodology/approach Data was collected from 208 Gen Z customers based on 5 constructs related to the adoption of health-care wearables. Confirmatory factor analysis and structural equation modelling was used to analyse the responses. The mediation paths were analysed using bootstrapping method and examination of the standardized direct and indirect effects in the model. Findings The study results indicated that the antecedent factors consisted of push (real-time health information availability), pull (normative environment) and mooring (decision self-efficacy) factors. The mooring factor (MOOR) was related to the push factor but not the pull factor. The MOOR, in turn, was related to the switching intention of Gen Z customers for health wearables adoption. Research limitations/implications The research study extended the literature related to the PPM theory in the context of the adoption of health wearables among Gen Z customers in India. Practical implications The study outcome would enable managers working in health wearable organizations to understand consumer behaviour towards health wearables. Social implications The use of health wearables among Gen Z individuals would lead to future generations adopting a healthy lifestyle resulting in an effective workforce and better economy. Originality/value This was one of the few studies which have explored the PPM theory to explore the factors for the adoption of health wearables among Gen Z customers in India.

Sign in / Sign up

Export Citation Format

Share Document