scholarly journals Prerequisites for Processing a Foam Product in the Process of Bacterial Oxidation of Gold-Bearing Concentrates in a Separate Cycle

2021 ◽  
Vol 278 ◽  
pp. 01012
Author(s):  
Rustam Khamidov ◽  
Zhakhongir Narzullayev ◽  
Evgeniy Kuznetsov
Keyword(s):  
Oxidation Process ◽  
Negative Impact ◽  
Optimal Solution ◽  
Significant Problem ◽  
Bacterial Oxidation ◽  
Processing Industry ◽  
Oxidation Technology ◽  
Metallurgical Combine ◽  
Refractory Ores ◽  
Gold Bearing

The recovery of gold from refractory ores and concentrates is a significant problem in the modern gold processing industry. The use of bacterial oxidation technology at the Navoi Mining and Metallurgical Combine (Uzbekistan) made it possible to increase the share of recoverable gold during the processing of refractory ores from the Kokpatas and Daugyztau deposits. However, during the operation of the biological installation, a problem arose of abundant foaming in bacterial oxidation reactors. This article is devoted to the issue of foaming during biooxidation and its negative impact on the oxidation process. Methods of combating foaming and the choice of the optimal solution, providing for the processing of bio-oxidation foam in a separate cycle, have been analyzed.

scholarly journals LAYOUT OPTIMIZATION FOR A FACTORY OF A MEXICAN RECYCLING COMPANY

2020 ◽  
Vol 6 (6) ◽  
pp. 146-165
Author(s):  
Oscar Bravo ◽  
Mara Belmonte ◽  
Beatriz Oechler ◽  
Uriel Rovero ◽  
Rodrigo de Icaza ◽  
...  
Keyword(s):  
Negative Impact ◽  
Optimal Solution ◽  
Layout Optimization ◽  
The Other

The present format is an investigation of the principal problems found at the present time at a Mexican Recycling factory. Said problems were analyzed and the ones with greater urgency to be solved or with greater negative impact were selected. These selected problems were analyzed, measured and calculated to find the optimal solution or the best recommendation possible. A change in the current layout was done with the objective of optimizing the resources of the plant as decreasing costs and errors that create an inefficient productivity inside the plant. This recommendations in the accommodation will be replicable in the other plants the company has around the Mexican Republic

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

Effect of antimonate on the bacterial oxidation of sulfide minerals extracted from persistent gold-bearing ores

Metallurgist ◽  
2011 ◽  
Vol 55 (7-8) ◽  
pp. 526-533
Author(s):  
A. V. Kanarskii ◽  
L. N. Krylova ◽  
E. V. Adamov
Keyword(s):  
Sulfide Minerals ◽  
Bacterial Oxidation ◽  
Gold Bearing

West Sole Pipeline Stabilisation

2005 ◽  
Author(s):  
Z. Chen ◽  
Eamon Sheehan
Keyword(s):  
Negative Impact ◽  
Optimal Solution ◽  
Sediment Budget ◽  
Gas Field ◽  
Critical Position ◽  
Coastal Evolution ◽  
Sea Bed ◽  
Pipeline Failure ◽  
The Uk

The BP West Sole gas field is located in Block 48/6 in the UK sector of the southern North Sea, about 70 km off the Holderness coast. Production from the gas field is exported to a shore terminal at Easington by two pipelines. Both pipelines were trenched at installation. Pipeline surveys over the last few years show that both pipelines are substantially exposed at the shore approach and inshore sections. This has occurred in part due to the retreat of the cliffs in Easington and subsequent lowering of the sea bed level and also the migration of sand from around the pipelines leaving them largely unburied and sitting on the local clay abrasion platform. It has been concluded that both pipelines require stabilisation sooner rather than later to reduce the risk of pipeline failure. Pipeline stabilisation options need to take account of the environment in which they have been placed. Easington is at a critical position along the Holderness coast. All net sediment transport from the Holderness coastline passes through this section. Any interruption to this movement could result in a change to the adjacent coast. Maintenance of the sediment budget is important to a wider area of the East coast of England. Stabilisation options must not reduce the net amount of sediment moving southwards past Dimlington and must not result in any long term negative impact on the coastal evolution. This paper outlines consultancy required and problems process regarding the geomorphological issues in getting acceptance from government and non-government bodies. A methodology has been developed that allows quantification of impacts of different options on the sediment budget and on the long-term coastal evolution (see also Chen et al 1998, 2001 and 2002). Application of this method aimed at providing understanding and information which is considered to be important in the process of selecting an optimal solution for the pipeline stabilisation in such an environmental sensitive coast.

scholarly journals Distributed Optimal Random Access Scheme for Energy Harvesting Devices in Satellite Communication Networks

Sensors ◽  
2018 ◽  
Vol 19 (1) ◽  
pp. 99
Author(s):  
Pengxu Li ◽  
Gaofeng Cui ◽  
Weidong Wang
Keyword(s):  
Energy Harvesting ◽  
Communication Networks ◽  
Satellite Communication ◽  
Negative Impact ◽  
Low Cost ◽  
Random Access ◽  
Optimal Solution ◽  
Wireless Channel ◽  
Communication Overhead ◽  
Iteration Algorithm

This paper considers satellite communication networks where each satellite terminal is equipped with energy harvesting (EH) devices to supply energy continuously, and randomly transmits bursty packets to a geostationary satellite over a shared wireless channel. Packet replicas combined with a successive iteration cancellation scheme can reduce the negative impact of packet collisions but consume more energy. Hence, appropriate energy management policies are required to mitigate the adverse effect of energy outages. Although centralized access schemes can provide better performance on the networks’ throughput, they expend extra signallings to allocate the resources, which leads to non-negligible communication latencies, especially for the satellite communication networks. In order to reduce the communication overhead and delay, a distributed random access (RA) scheme considering the energy constraints is studied. Each EH satellite terminal (EH-ST) decides whether to transmit the packet and how many replicas are transmitted according to its local energy and EH rates to maximize the average long-term network throughput. Owing to the nonconvexity of this problem, we adopted a game theoretic method to approximate the optimal solution. By forcing all the EH-STs to employ the same policy, we characterized and proved the existence and uniqueness of the symmetric Nash equilibrium (NE) of the game. Moreover, an efficient algorithm is proposed to calculate the symmetric NE by combining a policy iteration algorithm and the bisection method. The performance of the proposed RA scheme was investigated via numerous simulations. Simulation results showed that the proposed RA scheme is applicable to the EH devices in the future low-cost interactive satellite communication system.

Influence of EDTA-2Na Concertration on the Microstructure and Corrosion Behaviors of Mg-Al-Y Alloy

2015 ◽  
Vol 727-728 ◽  
pp. 201-204
Author(s):  
Yun Long Zhang ◽  
Mu Qin Li ◽  
Ping Liao ◽  
Yu Min Zhang
Keyword(s):  
Corrosion Resistance ◽  
Electrolyte Solution ◽  
Oxidation Process ◽  
Corrosion Current ◽  
Positive Potential ◽  
Micro Arc Oxidation ◽  
Corrosion Behaviors ◽  
Oxidation Technology ◽  
Structural Surface ◽  
Polarisation Measurements

In this paper,the micro-arc oxidation technology were utilized to fabricated the oxidation coating in order to resolve the corrosion resistance of the Mg-Al-Y alloy. The EDTA-2Na solution was introduced into the electrolyte solution for improving the coating corrosion properties.After the micro-arc oxidation process, phase structural, surface morphology and corrosion resistance of the MAO coating of Mg-Al-Y alloy were performed by XRD, SEM and Potentiodynamic polarisation measurements. The introduce of EDTA-2Na in the electrolyte solution improve the positive potential and reduced the corrosion current, which would improve the corrosion resistance properties of the Mg-Al-Y alloy.

scholarly journals Network Coding aware Routing for Efficient Communication in Mobile Ad-hoc Networks

2018 ◽  
Vol 7 (3) ◽  
pp. 1474
Author(s):  
V Prashanthi ◽  
D Suresh Babu ◽  
C V. Guru Rao
Keyword(s):  
Energy Efficiency ◽  
Network Coding ◽  
Network Lifetime ◽  
Routing Protocols ◽  
Negative Impact ◽  
Dominating Set ◽  
Optimal Solution ◽  
Sensor Nodes ◽  
Energy Usage ◽  
Improve Energy Efficiency

Existing approach of routing protocols had only partial support towards energy efficiency. However, none of them had focused on considering network coding aware routing to reduce energy consumption. Majority of the existing solutions in literature to improve the communication performance of MANET has focused on minimum cost routing protocols. There are very less significant studies towards network coding in performing routing in MANET system. Therefore, it is totally unknown how network coding could be used to solve such issues. Throughput in wireless networks can be enhanced with the help of network coding. This approach also increases network lifetime in the cases of devices running on battery, such as wireless sensor nodes. Additionally, network coding achieves a reduction in the number of transmissions needed for transmission of a specific message through the network by making energy usage more efficient. Despite its benefits, however, network coding can have a negative impact on network lifetime if it is implemented excessively. Initially, to achieve the goal of improving throughput, reducing energy efficiency by reducing the number of broadcasting transmissions, a network coding model is created in this study and the MANET broadcast based on network coding is improved by the heuristic principle of Ant Colony Optimization. This study proposes the application of a network coding based dominating set approach to traditional routing protocols like adhoc on demand distance vector (AODV) as a solution to this issue. Coding gain of different topologies with different offer loads is evaluated using network coding. We discussed the performance of Alice-bob, cross, X, and wheel topologies using network coding. The study has paid particular attention to the trade-off between selection of paths compatible with network coding and network lifetime. The present study addresses this compromise that demonstrates that networks with energy restrictions are incompatible with the current network coding strategies based on throughput. One routing issue is attributed particular importance, namely, reduction of overall energy usage and improvement of individual node lifetime through effective routing of a series of traffic demands over the network. A range of analytical formulations is put forth to generate an optimal solution for the issue of multi-path routing. Results show that, by comparison to solutions without network coding, the suggested solutions improve energy efficiency while at the same time satisfying the specified lifetime restrictions.

H2O2/periodate (IO4−): a novel advanced oxidation technology for the degradation of refractory organic pollutants

2019 ◽  
Vol 5 (6) ◽  
pp. 1113-1123 ◽  
Author(s):  
Nor Elhouda Chadi ◽  
Slimane Merouani ◽  
Oualid Hamdaoui ◽  
Mohammed Bouhelassa ◽  
Muthupandian Ashokkumar
Keyword(s):  
Organic Pollutants ◽  
Advanced Oxidation Process ◽  
Oxidation Process ◽  
Advanced Oxidation ◽  
Advanced Oxidation Technology ◽  
Oxidation Technology ◽  
Refractory Organic Pollutants

H2O2/periodate: a novel advanced oxidation process.

The impact of sanctions on the resolution of international business disputes: maintaining the status quo or looking for alternative jurisdictions?

2020 ◽  
Vol 10 (4) ◽  
pp. 144-167
Author(s):  
Saglar Ochirova ◽  
Vladislav Starzhenetskiy
Keyword(s):  
Dispute Resolution ◽  
Negative Impact ◽  
Optimal Solution ◽  
Status Quo ◽  
Choice Of Law ◽  
Advantages And Disadvantages ◽  
The Status ◽  
Domestic Jurisdiction ◽  
Legislative Amendments ◽  
The Impact

The negative impact of the economic sanctions is not limited to the sphere of substantive law; it also extends to issues related to dispute resolution. Trying to achieve a fair resolution of disputes sanctioned persons may face many obstacles literally at every stage of the proceedings, starting with problems related to payment of arbitration fees, searching for counsels and arbitrators who are often reluctant to taking corresponding sanctions risks, and ending with the stage of enforcement of a judgment or an arbitral award. Under these conditions, the conduct of court or arbitration proceedings, if theoretically possible, in practice will be associated with substantial organizational difficulties, delays in consideration of a case and significant additional costs. In this regard the authors, based on the foreign and Russian experience, analyze advantages and disadvantages of various options for resolving the disputes involving sanctioned persons, including maintaining the former procedure for resolving disputes, transferring disputes to a neutral or domestic jurisdictions, as well as the latest legislative amendments, namely provisions of the Russian Arbitrazh Procedure Code expanding the exclusive jurisdiction of Russian arbitrazh (commercial) courts which have entered into force in June 2020. Maintaining the status quo between parties to a dispute provides a high degree of legal certainty but does not take into account the potentially serious breach of sanctioned persons’ rights. While the transfer of dispute resolution to the domestic jurisdiction allows the latter to ensure the protection of their rights, but, in turn, carries the risks of violating the existing balance in relations between the parties, refusal to recognize and enforce a future judgement in foreign jurisdictions and etc. Given the impossibility to foresee in advance the extension of restrictive measures to parties of a contract and character of such measures, perhaps the optimal solution could be the so-called cascade arbitration clauses, providing for variability of actions in certain cases, in particular: 1) choice of alternative forum; 2) establishing additional requirements for the neutrality of arbitrators; 3) waiver of the parties to submit disputes to jurisdictions that cannot provide equal and impartial resolution of the dispute in new circumstances. In addition, the parties are strongly encouraged to carefully consider the choice of law provisions, including choice of law applicable to the arbitration agreement.

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