scholarly journals CHEMOGENIC SEDIMENTS OF MUTNOVSKY GEOTHERMAL COMPLEX (SOUTH KAMCHATKA)

2021 ◽  
pp. 66-76
Author(s):  
O.A. Zoben’ko ◽  
◽  
V.M. Okrugin ◽  
I.I. Chernev ◽  
E.Yu. Plutakhina ◽  
...  
Keyword(s):  
Noble Metals ◽  
Native Gold ◽  
Turbine Blades ◽  
Water Mixture ◽  
Structural Elements ◽  
Great Role ◽  
Hydrothermal Processes ◽  
Gold Silver ◽  
Plant Data ◽  
Geothermal Plant

By studying the processes taking place at the operating geothermal stations it is possible to model and understand some features of formation of minerals of geothermal origin, processes of transfer by hydrothermal solutions and concentration of some metals by analogy with the ore-forming processes at the formed deposits. During the release of steam-water mixture and outpouring of water from the wells silica gel is deposited, a number of elements (including noble metals) migrate and accumulate in the sediments. A great role during exploitation of wells, operation of turbines, separators and other structural elements of geothermal stations is played by the chemical composition of the coolant. Because of its high mineralization deposition on various units and parts of equipment occurs, what may complicate the operation of a geothermal plant. We describe the composition of chemogenic deposits on various technological elements of the Mutnovskaya geothermal power plant. Data on sediments sampled in boreholes, on turbine blades and separator are presented. We have revealed a wide variety of such deposits, both oxide compounds and ore phases (from magnetite, chalcopyrite, minerals of faint ore group to native gold, tellurides, selenides and sulfides of gold and silver). We suppose that the processes currently taking place at the Mutnovskoye steam hydrothermal field are similar to the hydrothermal processes that contributed to the formation of vein zones of the gold-silver-polymetallic deposit of the same name.

Damage mitigation techniques in wind turbine blades: A review

2017 ◽  
Vol 41 (3) ◽  
pp. 185-210 ◽  
Author(s):  
Md Abu S Shohag ◽  
Emily C Hammel ◽  
David O Olawale ◽  
Okenwa I Okoli
Keyword(s):  
Wind Turbine ◽  
Turbine Blades ◽  
Structural Elements ◽  
Variable Loading ◽  
Wind Turbine Blades ◽  
Lightning Strikes ◽  
Manufacturing Defects ◽  
Damage Mitigation ◽  
Mitigation Techniques ◽  
Operational Errors

Wind blades are major structural elements of wind turbines, but they are prone to damage like any other composite component. Blade damage can cause sudden structural failure and the associated costs to repair them are high. Therefore, it is important to identify the causation of damage to prevent defects during the manufacturing phase, transportation, and in operation. Generally, damage in wind blades can arise due to manufacturing defects, precipitation and debris, water ingress, variable loading due to wind, operational errors, lightning strikes, and fire. Early detection and mitigation techniques are required to avoid or reduce damage in costly wind turbine blades. This article provides an extensive review of viable solutions and approaches for damage mitigation in wind turbine blades.

scholarly journals DISCOVERY AND STUDY HISTORY POKROVSKY GOLD ORE DEPOSIT IN THE AMUR REGION

2020 ◽  
pp. 63-72
Author(s):  
ANTON VLADIMIROVICH MELNIKOV ◽  
◽  
VITALY ALEKSEEVICH STEPANOV ◽  
DMITRIY VALERYEVICH YUSUPOV ◽  
◽  
...  
Keyword(s):  
Native Gold ◽  
Amur Region ◽  
Near Surface ◽  
Ore Deposit ◽  
Gold Ore ◽  
Gold Silver ◽  
History Of ◽  
Typical Composition ◽  
Gold Ore Deposit

A brief history of the discovery and study of the large Pokrovsky gold ore deposit of the Amur Region, from the ores of which about 63 tons of gold were extracted, is given. The role of scientific and production organizations and individual geologists in the discovery of the deposit is shown. According to the results of almost half a century of research, the deposit is classified as a near-surface gold-silver formation with a typical composition of ores, near-ore metasomatites and native gold for deposits of this type. The closest analogue of Pokrovka is the Kubak deposit of the Omolonsky gold-silver province.

scholarly journals The Lode Gold Occurrence in the «Territory» of Oleg Kuvaev (North of the Chukotka Upland)

2021 ◽  
Vol 20 (3) ◽  
pp. 250-266
Author(s):  
V.I. Silaev ◽  
◽  
A.V. Kokin ◽  
V.N. Filippov ◽  
A.F. Khazov ◽  
...  
Keyword(s):  
Quartz Vein ◽  
Native Gold ◽  
Gold Deposits ◽  
Lode Gold ◽  
Carbon Particles ◽  
The North ◽  
Aluminium Sulfate ◽  
Gold Silver ◽  
Lode Gold Deposits ◽  
Gold Sulfide

A sample of a gold-bearing quartz vein from the Upper-Ichuveem ore occurrence, discovered in the Triassic terrigenous complex in the north of the Chukotka Upland, the Oleg Kuvaev's “Territory”, had been comprehensively studied. The gross gold grade was estimated at 3–4 g / t. The vein includes quartz, native gold, sulfide-goldsilver solid solutions, alumoseladonite, aluminium-sulfate-phosphates Fe-Pb-Mg-Ca compound, apatite, pyrite, iron-titanium oxides, litharge, native phases composed of Fe (Ni), Ag-Pb-Bi, Fe-Al-PS-As, multicomponent ocher of hypergene origin. Native gold ranges from medium to fine. The vein contains particles of non-crystalline organic matter, which is close in composition of organic groups to polysaccharides. It is possible that the carbon particles found in the gold-quartz vein are of an abiogenic nature and can be compared with abiogenic condensed organelles in the products of modern volcanism. The data obtained make it possible to attribute the Upper- Ichuveem gold ore occurrence to a low-sulfide gold-quartz formation, but with additional signs of gold-silver and polymetallic formations, which can be regarded as a favorable prerequisite for prospecting and exploration in Oleg Kuvaev's «Territory» not only of gold-placer deposits, but also of lode gold deposits.

scholarly journals Modeling groundwater flow and salinity evolution near TSF Żelazny Most. Part I – groundwater flow

2018 ◽  
Vol 54 ◽  
pp. 00036
Author(s):  
Waldemar Świdziński
Keyword(s):  
Numerical Model ◽  
Groundwater Flow ◽  
Chloride Transport ◽  
Numerical Models ◽  
General Information ◽  
Water Mixture ◽  
Groundwater Environment ◽  
Gold Silver ◽  
Copper Gold ◽  
System Part

Tailings which are by-product of the extraction of various metals (copper, gold, silver, molybdenum, etc.) are often stored in so called Tailings Storage Facilities (TSF), where they are deposited as a soil-water mixture by spigotting. In many cases the water discharged together with tailings to the TSF is rich in salts and other chemical compounds imposing negative pressure to the groundwater environment. Even in the case of total or partial lining of such facilities and well-developed drainage systems to control leaching, some portion of contaminated water often seeps either through the surrounding dams or the bed into adjacent groundwater bodies. Numerical models can be very helpful tools to assess the extent of the contamination and particularly to predict its potential development in the future. This paper and the companion one describe such a numerical model developed for Żelazny Most Tailings Storage Facility (south-west Poland), one of the world’s largest tailings sites. In the first part general information about the facility is provided and a 3D hydrogeological numerical model of the structure is described. Groundwater flow pattern near the facility obtained from numerical simulations is confronted with the measurements from a comprehensively developed monitoring system. Part II will be focused on the modelling of chloride transport in groundwater.

scholarly journals Long-term use of noble metal alloy coated urinary catheters reduces recurrent CAUTI and decreases proinflammatory markers

2019 ◽  
Vol 11 ◽  
pp. 175628721985491 ◽  
Author(s):  
Birgitta Magnusson ◽  
Ylva Kai-Larsen ◽  
Petter Granlund ◽  
Åke Seiger ◽  
Lena Lindbo ◽  
...  
Keyword(s):  
Noble Metal ◽  
Proinflammatory Cytokines ◽  
Noble Metals ◽  
Foley Catheter ◽  
Metal Alloy ◽  
Necrosis Factor Alpha ◽  
Gold Silver ◽  
Tract Infections ◽  
Patient Use

Background: The objective of this study was to investigate a case of a permanently (suprapubic) catheterized woman with neurogenic bladder dysfunction. The patient had suffered from recurrent catheter-associated urinary tract infections (CAUTIs) since 2009, despite several prevention approaches and attempts. In 2013, the patient’s catheter was substituted for the BIP Foley Catheter, coated with a noble metal alloy (NMA) of gold, silver, and palladium. Method: This is a retrospective–prospective clinical case study covering 4 years history for the control catheters and up to 2.5 years for the anti-infective BIP Foley Catheter. CAUTI incidences, symptoms, antibiotics, catheter performance, and comfort were evaluated. Levels of proinflammatory cytokines were measured pre- and post-substitution to BIP Foley Catheter in urine of the case and of four other permanently catheterized patients. In addition, the levels of noble metals were assessed in urine of the case subject during use of the BIP Foley Catheter. Results: While using control catheters, the patient experienced symptomatic CAUTIs requiring antibiotics almost every month for 4 years. After 1 month with the BIP Foley Catheter, the symptoms disappeared, and the patient remained free of symptomatic CAUTIs and antibiotic treatment for the following 2.5 years, despite bacteriuria. The patient was satisfied with the comfort during insertion, use, and removal of the BIP Foley Catheter. Urinary levels of the proinflammatory cytokines interleukin (IL)-6, IL-8, and tumor necrosis factor alpha (TNFα) decreased towards normal levels post catheter type substitution. Traces of noble metals detected in a few urine samples were ⩽4% of the permitted daily exposure. The levels of the noble metals gold, silver, and palladium remaining on the BIP Foley Catheter after use were the same as for unused catheters. Conclusion: Long-term use of a NMA-coated catheter was associated with cessation of frequent CAUTIs. The catheter was experienced as comfortable and inflammatory markers were reduced with time. The coating was stable, with no significant metal release into urine and is therefore safe for patient use.

The native gold extracted in the Amur Region for 150 years

2021 ◽  
pp. 57-62
Author(s):  
ANTON MELNIKOV ◽  
VALENTINE MOISEENKO ◽  
VITALY STEPANOV
Keyword(s):  
Native Gold ◽  
Amur Region ◽  
Gold Production ◽  
Sample Distribution ◽  
Placer Gold ◽  
Porphyry Deposits ◽  
Percentage Points ◽  
Gold Silver ◽  
Production History ◽  
Gold Sulfide

Data on gold production history and typomorphic features of native gold from the Amur province are provided. It is shown that about 1,116 t of primarily placer gold was extracted for 150 years, with primary gold accounting for 23,8 %. Placer gold sample distribution is unimodal with a maximum ranging within 850–925 ‰. Mercury prevails in microimpurities, its content in some clusters reaches the first percentage points. In terms of composition impurities, placer gold corresponds to gold from fields and occurences of gold-quartz and gold-sulfide-quartz formations. Low-fineness gold, (799–700 ‰) less common in placers, resulted from destruction of gold-silver unit sources while that of average fineness (800–900 ‰) was a result of the same process related to gold-polymetallic and gold-sulfide units. Gold-copper-molybdenum porphyry deposits do not form placers. The prospects of primary and placer gold production in the Amur region are defined.

scholarly journals X. On a new fulminating platinum

1817 ◽  
Vol 107 ◽  
pp. 136-157
Keyword(s):  
Noble Metals ◽  
Scientific Discovery ◽  
Chemical Properties ◽  
Present Communication ◽  
Gold Silver ◽  
Chemical History ◽  
A Chain ◽  
Chemical Characters ◽  
Physical And Chemical ◽  
And Chemical Properties

The metals, as is well known, closely resemble each other in their physical and chemical characters. A chain of analogies connects them together into one class, and serves to distinguish them from all other bodies with which we are acquainted. Hence, the observation of a new property, or the discovery of a new relation in any one of the metals, is a sufficient ground for extending similar enquiries to all the others. And though the same methods may not furnish equally successful results in the case of different metals, yet by varying the processes, some new truths are usually brought to light. The analogies that exist between the different metals, are in some cases nearer, and in others more remote; but in all instances they are sufficiently numerous and striking to serve the ends of classification, and facilitate the progress of scientific discovery. Gold, silver, and platinum, were for­merly distinguished by the epithet nobel or perfect metals; this distinction, though it no longer exists, was founded on a similarity in their physical properties. Gold and silver furnish with the volatile alkali, well known fulminating compounds. Gold and platinum appear to be more closely related to each other than they are to silver, or to any of the other metals; though separated by a number of marked dis­tinctions, they yet possess in common, many points of resem­blance. They are both soluble in the same menstrua, and can only with difficulty be made to unite with oxygene, chlorine or sulphur; and their oxides form peculiar triple compounds with acid and alkaline or earthy substances. From these analogies, and especially the last, it might be presumed that platinum, like gold, by particular treatment, was capable of furnishing a fulminating compound. Since platinum has been known to chemists, different attempts have been made to produce such a compound, but without effect. On the discovery of fulminating mercury by Mr. Howard, he endeavoured to communicate fulminating properties to compounds of platinum, by means of alcohol, but his trials were unsuccessful. I have to a certain extent succeeded in this way, and my attempts have led to the observation of some new facts. I have also obtained a new compound of platinum, analogous in its properties and composition to aurum fulminans , and which, in consequence, I shall venture to designate by the term fulminating platinum . I have, indeed, already noticed a peculiar compound of platinum under this name, but the term should be restricted to the new compound, on account of its superior fulminating properties. This fulminating platinum serves to extend the existing analogies between the noble metals, and fills up a vacant space in their chemical history. In the present communication, I shall endeavour to describe this substance; but before I enter on the detail of its physical and chemical properties, it may be proper to notice the methods by which it may be procured.

Residual stresses in structural elements of the internal cavity of cooled turbine blades

1989 ◽  
Vol 21 (12) ◽  
pp. 1694-1698
Author(s):  
A. N. Arkhipov ◽  
A. B. Pryazhnikov ◽  
Yu. M. Temis
Keyword(s):  
Residual Stresses ◽  
Turbine Blades ◽  
Internal Cavity ◽  
Structural Elements

Evaluation of a diagnostic leaching technique for gold in native gold and gold ± silver tellurides

2001 ◽  
Vol 14 (1) ◽  
pp. 1-12 ◽  
Author(s):  
K.J. Henley ◽  
N.C. Clarke ◽  
P. Sauter
Keyword(s):  
Native Gold ◽  
Gold Silver

scholarly journals Mineralogy of noble metals (Au, Ag, Pd, Pt) in Volkovskoe Cu-Fe-Ti-V deposit (Middle Urals, Russia)

LITOSFERA ◽  
2021 ◽  
Vol 21 (5) ◽  
pp. 653-659
Author(s):  
V. V. Murzin ◽  
G. A. Palyanova ◽  
E. V. Anikina ◽  
V. P. Moloshag
Keyword(s):  
Noble Metals ◽  
Native Gold ◽  
Middle Urals ◽  
Research Subject ◽  
Mineral Formation ◽  
X Ray ◽  
Two Generations ◽  
Magmatic Stage ◽  
Mineral Compositions ◽  
High Concentrations

Research subject. The mineral compositions of titanomagnetitic (apatite, titanomagnetite) and copper-titanomagnetitic (bornite, chalcopyrite, apatite, titanomagnetite) ores of the Volkovskoe Cu-Fe-Ti-V deposit (Middle Urals, Russia).Methods. The research was carried out using a Jeol JSM-6390LV scanning electron microscope and X-ray spectral microanalyzers JXA-5 (Jeol) at the Geoanalitik Collective Use Center of the IGG UB RAS. Results and conclusions.Native gold (with ≤ 0.3 wt % Pd, 0.2–0.4 wt % Cu; fneness 800–914 ‰), tellurides of Pd, Au and Ag (merenskyite, keithconnite, sylvanite, hessite) and Pt arsenide (sperrylite) were found in the copper-titanomagnetitic ores. For the frst time, two generations of native gold (fneness 1000 and 850–860 ‰) and palladium telluride (keithconnite Pd3-xTe) were detected in titanomagnetitic ores. The sequence of ore mineral formation and the features of their genesis were revealed. Native gold (fneness 1000‰) in the form of microinclusions in titanomagnetite was attributed to the magmatic stage. Noble metal minerals, intergrown with copper sulfdes (bornite, chalcopyrite, digenite) and associated with late hydroxyl-bearing minerals (amphibole, epidote, chlorite), are superimposed in relation to the magmatic minerals (pyroxene, plagioclase, hornblende, apatite, titanomagnetite, ilmenite, etc.) of these ores. Merenskyite, sperrylite, high fneness gold (800–914 ‰), as well as carrolite, cobaltite, copper-cobalt telluride and bismuth tellurium-selenide kawazulite Вi2Te2Se are syngenetic with copper sulfdes. The Au-Ag tellurides were deposited later than these minerals. It is shown that the high fugacity of tellurium, which binds Pd, Au, and Ag into tellurides, prevents the occurrence of native gold containing high concentrations of palladium and silver.

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