The Chemical Technology for Producing Precious Metals from Enrichment Rejects of Copper-Pyrite Ores

2021 ◽  
Vol 316 ◽  
pp. 625-630
Author(s):  
Nadezhda L. Medyanik ◽  
Anton P. Ponomarev ◽  
Olga V. Yershova

The chemical technology for recovery precious metals Au and Ag from mature flotation tailings of copper-pyrite ores by two-stage sintering with chlorine-ammonium reagents and leaching of bakes with water is developed. The chemical extraction of gold and silver is carried out, using NH4Cl and NH4NO3 reagents in the ratios of 1:1 at a temperature of 250 °C, and 2:1 at 200 °C. In accordance with the obtained results, a chemical technology of enrichment rejects of copper-pyrite ores processing and a scheme of primary apparatus chain for implementing this technology are proposed. The economic effect of the technology realization is calculated. This effect is 96.3 million rubles with a payback period of 8 years when processing enrichment rejects of copper-pyrite ores in amount of 109.5 thousand tons per year under the conditions of JSC “Uchaly Mining and Metallurgical Combine”.

2021 ◽  
Vol 27 (6) ◽  
pp. 31-39
Author(s):  
N. Medyanik ◽  
◽  
E. Leontieva ◽  
O. Mishurina ◽  
E. Mullina ◽  
...  

The article analyzes the possibility and efficiency of processing stale tailings of flotation plants of the copper pyrite complex. The resource potential, material composition and technological capabilities of processing a number of technogenic objects are considered. The interrelation and influence of mineralogical and technological factors on the choice of tailings processing technology are analyzed. The results of chemical, mineral and phase analysis of stale flotation tailings of the studied pyrite ores are presented. According to the complex studies’ results, it is established that the stale flotation tailings of copper pyrite ores belong to a refractory type of geo-resources due to the high content of pyrite and low, at the level of ppm, gold and silver content, which are present mainly in the “resistant” minerals - chalcogenides, sulphides, their intergrowths. The article presents a factor analysis and conditions for the elemental composition of tailings formation: mineralogical, technological and environmental. The territorial accessibility and technological capability of the investigated technogenic formations are analyzed. In the course of experimental studies, the elemental composition of stale tailings has been revealed - the main components of which are: iron, sulfur, silicon and aluminum. According to the results of X-ray phase analysis, it has been found that the main ore mineral of the tailings is pyrite. At the same time, it is noted that the main share of gold in the stale flotation tailings is presented in the form of sulphides in the form of finely dispersed and isomorphic inclusions. The heterogeneous morphometric and mineral composition of sulphide aggregates, their difficult opening and high dispersion characterize stale tailings as a raw material that is difficult to float. The revealed features of the material composition of stale tails indicate the impossibility of extracting valuable components (gold and silver) from this resource using existing traditional technologies. It has been proved that it is possible to effectively extract precious metals from this category of raw materials only after their deep opening by chemical processing. The relevance of the research lies in the need to process gold-containing man-made waste in order to significantly expand the raw material base of mining enterprises, as well as to improve the ecological situation of the city-forming mining enterprises of the South Urals. The aim of the research is to study the material composition of stale tailings and develop a technology for selective extraction of gold and silver. The object of research is the stale flotation tailings of copper-pyrite enterprises of the Southern Urals. The subject is the mineral composition, the content of useful components of lying tailings and the technology of gold and silver selective extraction from them. Material and research methods. During the experiments, a set of physicochemical and chemical methods of analysis has been used: thermodynamic analysis, synchronous thermal analysis using a combined thermal analyzer of the Netzsch STA 449 F3 Jupiter brand, UV spectroscopy with an automated data processing system), qualitative chemical and assay analyzes


2021 ◽  
Vol 62 (3b) ◽  
pp. 58-68
Author(s):  
Toi Trung Tran ◽  
Chinh Thi Vu ◽  
Nhung Thi Pham ◽  

Wastes from electrical - electronic equipment (WEEE) are of huge concerns worldwide. With the decreasing life cycle of most electrical - electronic equipment (EEE), the WEEE growth rate is fast, about 3÷5% annually. This is considered as the fastest growing waste stream among municipal wastes. WEEE contains, in addition to plastic, glass etc., high contents of base metals and precious metals. They are regarded as potential secondary resources of metals in addition to primary resources of metals from metallic ores. Over the past decades, many metal recycling technologies from WEEE have been developed including physical separation processes and chemical extraction processes. This article summarizes the characteristics, recycling principles, separation processes and optimal operating conditions of the world's most currently common technologies for metal recycling from WEEE. So that one can derive new directions for metal recycling from electrical - electronic wastes in the Vietnam case.


2013 ◽  
Vol 671-674 ◽  
pp. 3096-3099
Author(s):  
Meng Fang Zhang ◽  
Liang Huang ◽  
Lu Yang Shan

The investment payback period of construction projects is an important index that evaluate and measure economic effect of project investment. It is difficult that the investment payback period of construction projects is calculated generally using analytic method.We established the mathematical model of the payback period, the annual net cash flows are Markov chains. According to the similar projects, collected net yearly cash flow and each quarter net cash flow, A one-step transition probability matrix was described by using the computer simulation of Markov chains, forecasted the dynamic and static payback period of construction projects investment. so as to provide the scientific basis data for decision makers.


2018 ◽  
Vol 12 (4) ◽  
pp. 16-21 ◽  
Author(s):  
P A Savinykh ◽  
Yu. V. Sychugov ◽  
V. A. Kazakov

The use of fractional technologies for post-harvest treatment and processing of grain heap delivered from field with further special purpose use of grain fractions leads to a significant increase in grain production efficiency. (Research purpose) Developing a fractional technology for post-harvest treatment and processing of grain with crushing and preservation of feed grain fraction and designing a technological line and machines for it. (Materials and methods) The authors have analyzed the technological level and developed a fractional technology for grain post-harvest treatment and processing by crushing with subsequent preservation of the feed grain fraction. They have offered a technological line and presented the design and technological parameters of the corresponding technical means (МЗУ-20Д - grain cleaning universal machine, МПО-30ДФ - preliminary grain cleaning machine with fractionation, ПЗД-3,1, ПЗД-10 – two-stage grain crusher). (Results and discussion) The authors have designed, manufactured and tested a universal grain-cleaning machine МЗУ-20Д. It efficiently cleans grain material coming from the field after its threshing by combine harvesters, and divides it into fractions: seed and feed grain – 60-70 percent, waste material - up to 10 percent, grain fodder - up to 40 percent. Further on, the grain is sent for crushing (for wet grain), followed by preservation and hermetic storage of the products obtained before their feeding to animals. Tests have shown that the developed feed preparation machine efficiently performs the technological process. The authors have developed a two-stage grain crusher (ПЗД-3,1), performing the crushing of grain material in two stages by three rollers, followed by preservation (for wet grain) of the feed grain fraction. (Conclusions) It has been established that the use of the new fractional technology and equipment contributes to an increase in grain cleaning productivity – by 30-40 percent, and the estimated annual economic effect of the renovation  is 400,000 rubles. The estimated annual economic effect of the use of the two-stage grain crusher (ПЗД-3,1) has proved to be more than 60 thousand rubles, and the level of production intensification has increased by 26 percent as compared to the MURSKA crusher produced in Finland.


2022 ◽  
Vol 10 ◽  
Author(s):  
Svetlana Mukhacheva ◽  
Yulia Davydova ◽  
Artëm Sozontov

The dataset contains records of small mammals (Eulipotyphla and Rodentia) collected in the background (unpolluted) areas in the vicinity of Karabash copper smelter (Southern Urals, Russia) and the territory of the Sultanovskoye deposit of copper-pyrite ores before the start of its development. Data were collected during the snowless periods in 2007 (18 sampling plots), 2008–2010 (13 plots annually), 2011 (30 plots) and 2012–2014 (19 plots annually). The capture of animals was carried out in different types of forests (pine, birch, mixed and floodplain), sparse birch stands, reed swamps, marshy and dry meadows, border areas, a household waste dump, areas of ruderal vegetation and a temporary camp. Our study of small mammals was conducted using trap lines (snap and live traps). During the study period, 709 specimens of small mammals were caught, which belonged to five species of shrews and 13 species of rodents. The dataset may be highly useful for studying regional fauna and the distribution of species in different habitats and could also be used as reference values for environmental monitoring and conservation activities. Our dataset contains new information on occurrences of small mammals. It includes the peculiarities of their habitat distribution in the background areas in the vicinity of the large copper smelter and the deposit of copper-pyrite ores before the start of its development (Chelyabinsk Oblast, Russia). All occurrence records of 18 mammal species with georeferencing have been published in GBIF.


Author(s):  
M.I. Mansurov ◽  
B.H. Galandarov ◽  
U.I. Karimli ◽  
A.I. Huseynov

The article presents the results of studies of the distribution of gold and associated ore elements in gold-copper pyrite ores of the Kyzylbulag deposit. It was established that the elemental composition of ores and host rocks of the deposit includes Cu, Pb, Au, Ag, Ni, As, Sb, Bi, and Mo, of which Au, Cu, Ag, and Zn are the more stable. The behavior of elements was also studied for the entire ore body, as a result of which they are divided by cluster analysis at R (5 %) - 0.1 into two groups: 1) Au, Cu and Ag; 2) Pb and Zn. The closest relationship in the first group was found between Au and Cu, Au and Ag, Ag and Cu; and in the second, between Pb and Zn. Acquired results confirm that gold and the copper are the major components of ore in the field expressed generally in the mineral paragenesis of chalcopyrite - native gold shown in the independent hydrothermal stage of ore deposition.


2005 ◽  
Vol 49 (4) ◽  
pp. 189-189
Author(s):  
Jianmin Yu

2012 ◽  
Vol 446-449 ◽  
pp. 3782-3786 ◽  
Author(s):  
Meng Fang Zhang ◽  
Liang Huang ◽  
Yi Ping Cai

Investment projects of the civil engineering have many characteristics,such as large scale of construction,tremendous investment cost,long payback period of investment, and bad risk. For investors, the investment payback period of construction projects is an important index that evaluate and measure economic effect of project investment. The investment capital can be recovered in the operation of actual projects by the influence of random factors, it is difficult that the investment payback period of construction projects is calculated generally using analytic method. Combined with restaurant project in this paper, set up the mathematical model of the payback period of investment, find out random factors that influence its cash flow of restaurant project, to research and measure the data of random factors on existing similar projects, to determine the probability distribution of random parameters,and Statistical data processing, make use of the computer simulation, set up the simulation model of the payback period of investment, to forecast the static and dynamic payback period of construction projects,provided decision-making with scientific base and meaningful reference.


Mathematics ◽  
2021 ◽  
Vol 9 (18) ◽  
pp. 2196
Author(s):  
Vadim Kazakbaev ◽  
Safarbek Oshurbekov ◽  
Vladimir Prakht ◽  
Vladimir Dmitrievskii

The paper compares the economic effect of using capacitors in fixed speed drives of a pumping station when using energy-efficient motors of various types. Induction motors of IE2 and IE3 energy efficiency classes, a direct-on-line synchronous motor with a permanent magnet in the rotor, and a direct-on-line synchronous reluctance motor are considered. The comparison takes into account not only the efficiency of the motors, but also their power factor, on which the losses in the cable and transformer depend. The possibility of using static capacitors to compensate for the reactive power of motors and reduce the losses is also considered. The feasibility analysis takes into account that the motors have different initial costs. The cost of capacitors is also taken into consideration. The analysis shows that the use of static capacitors can have a significant impact on the comparison between different motors in this application. Without considering capacitors, the permanent magnet motor has the shortest payback period, otherwise the synchronous reluctance motor has the shortest payback period.


Author(s):  
Sergey Stetsenko ◽  
◽  
Nadiia Bolila ◽  
Lesya Sorokina ◽  
Tetiana Tsyfra ◽  
...  

The anti-crisis potential of enterprises belonging to industries with a long production cycle is unstable, as the time interval between incoming cash flows is much longer than between outgoing ones. This problem is especially actual for construction companies, whose income largely depends on the state of investment demand. Therefore, there is a need to develop an effective mechanism to control the resilience of the anti-crisis system of the construction company to environmental conditions. According to many scientists, anti-crisis potential is associated with the financial sanation. Given the undeniable usefulness of the analyzed developments, there has been noted that they are unsuitable for managing the financial sanation capacity and anti-crisis potential of construction companies. After all, most of them are suggested for agricultural or industrial ones. Given the definition of "financial sanation", the implementation of measures aimed at restoring business is impossible without investment. Investing funds in any business project, including those aimed at strengthening the financial condition of the enterprise, will be efficient only when they provide an economic effect. Thus, the requirement of return on investment is indisputable, but for high-risk activities, including construction, there is an additional condition, to get a return on investment as soon as possible: from 3 to 10 years. After all, this is the duration period of different types of macroeconomic cycles, during which the vast majority of construction companies go through all stages of economic development: from growth to decline. The dependence of the payback period of equity capital on other factors of the internal and external environment of business systems has been studied in order to manage the rehabilitation and anti-crisis potential of a construction company. General scientific methods such as analysis, synthesis, deduction, induction, analogy as means of studying and generalizing theoretical approaches to providing anti-crisis potential; Васkwаrd Stерwisе method (construction of multifactor linear regressions Stаtistіса 8.0), providing the sequential construction of equations in which the set of input factors decreases by removing the least significant to explain the variation of the independent variate. In order to increase the efficiency of decision-making on the feasibility of additional equity attraction by construction companies there has been developed a methodological approach to forecasting the level of financial sanation capacity of the construction company. It is a complex; a multifactor model - a linguistic scale, allows to identify changes in the payback period of equity in the medium term using quantitative and linguistic estimates and can be used as a functional module of digitized economic management of the enterprise.


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