Thermodynamic Modelling of Oxide Conversion Processes for Metals of Life

In the presented work, the environmentally friendly production processes of pure metals via reduction from the respective oxides in the atmosphere of ultra-low oxidation potential (PO₂=10¹⁶—10²⁶ atm) are offered. We propose the formation of such an environment by injection of ethyl alcohol in the re...

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Автори: Mikadze, O.I., Bagdavadze, J.I., Dzigrashvili, T.A., Maisuradze, N.I.
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Опубліковано: Інститут металофізики ім. Г.В. Курдюмова НАН України 2015
Назва видання:Металлофизика и новейшие технологии
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Цитувати:Thermodynamic Modelling of Oxide Conversion Processes for Metals of Life / O. I. Mikadze, J. I. Bagdavadze, T. A. Dzigrashvili, N. I. Maisuradze // Металлофизика и новейшие технологии. — 2015. — Т. 37, № 1. — С. 115-120. — Бібліогр.: 5 назв. — англ.

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spelling irk-123456789-1117102017-01-14T03:03:16Z Thermodynamic Modelling of Oxide Conversion Processes for Metals of Life Mikadze, O.I. Bagdavadze, J.I. Dzigrashvili, T.A. Maisuradze, N.I. Дефекты кристаллической решётки In the presented work, the environmentally friendly production processes of pure metals via reduction from the respective oxides in the atmosphere of ultra-low oxidation potential (PO₂=10¹⁶—10²⁶ atm) are offered. We propose the formation of such an environment by injection of ethyl alcohol in the reactor and interaction of its vapour with oxygen. Such conditions promote dissociation of oxides of almost any kind. Using this method, the pure, so-called ‘metals of life’ are obtained: Cu, Fe, Ni, and Co, which are used in medicine as the essential nutrients. In the case of chromium conversion, this process is completed with the synthesis of carbide phases. Production of pure Cr is possible by using the similar methodology with the help of oxygen pump. For identification of the reduced products, an X-ray phase analysis is used. The purity of the converted products is characterized by spectrochemical analysis. The experimental data are in a good conformity with the thermodynamic calculations of optimal temperature ranges of conversion reactions and the ratio of the initial ingredients. У запропонованій роботі розглянуто екологічно безпечні процеси одержання чистих металів шляхом їх відновлення з відповідних оксидів у атмосфері з ультранизьким окиснювальним потенціялом (PO₂=10¹⁶—10²⁶атм.). Ми пропонуємо створення такого середовища інжекцією етилового спирту в замкнений контур реактора внаслідок взаємодії пари спирту з киснем. Такі умови сприяють дисоціяції оксидів майже будь-якого виду. Цією методою одержано так звані «метали життя»: Cu, Fe, Ni и Co, які використовуються в медицині як поживні нутрієнти. У випадку конверсії оксиду хрому процес завершується синтезою карбідних фаз. Одержання чистого Cr можливе застосуванням подібної методології за допомогою кисневої помпи. Ідентифікація продуктів конверсії відбувається рентґенофазовою структурною аналізою, а їхня чистота контролюється спектрохемічною методою. Експериментальні дані добре узгоджуються з термодинамічними обчисленнями оптимальних температур конверсійних реакцій і молярних часток початкових інґредієнтів. В предложенной работе рассмотрены экологически безопасные процессы получения чистых металлов путём их восстановления из соответствующих оксидов в атмосфере с ультранизким окислительным потенциалом (PO₂=10¹⁶—10²⁶ атм.). Мы предлагаем создание такой среды инжекцией этилового спирта в замкнутый контур реактора в результате взаимодействия паров спирта с кислородом. Такие условия способствуют диссоциации оксидов почти любого вида. Этим методом получены так называемые «металлы жизни»: Cu, Fe, Ni и Co, применяемые в медицине как питательные нутриенты. В случае конверсии оксида хрома процесс завершается синтезом карбидных фаз. Получение чистого Cr возможно применением подобной методологии с помощью кислородного насоса. Идентификация продуктов конверсии происходит рентгенофазовым структурным анализом, а их чистота контролируется спектрохимическим методом. Экспериментальные данные находятся в хорошем согласии с термодинамическими вычислениями оптимальных температур конверсионных реакций и молярных долей начальных ингредиентов. 2015 Article Thermodynamic Modelling of Oxide Conversion Processes for Metals of Life / O. I. Mikadze, J. I. Bagdavadze, T. A. Dzigrashvili, N. I. Maisuradze // Металлофизика и новейшие технологии. — 2015. — Т. 37, № 1. — С. 115-120. — Бібліогр.: 5 назв. — англ. 1024-1809 PACS: 61.72.sd, 64.75.Lm, 68.47.Gh, 81.05.Je, 81.65.Mq, 82.30.Lp, 82.80.Ej http://dspace.nbuv.gov.ua/handle/123456789/111710 en Металлофизика и новейшие технологии Інститут металофізики ім. Г.В. Курдюмова НАН України
institution Digital Library of Periodicals of National Academy of Sciences of Ukraine
collection DSpace DC
language English
topic Дефекты кристаллической решётки
Дефекты кристаллической решётки
spellingShingle Дефекты кристаллической решётки
Дефекты кристаллической решётки
Mikadze, O.I.
Bagdavadze, J.I.
Dzigrashvili, T.A.
Maisuradze, N.I.
Thermodynamic Modelling of Oxide Conversion Processes for Metals of Life
Металлофизика и новейшие технологии
description In the presented work, the environmentally friendly production processes of pure metals via reduction from the respective oxides in the atmosphere of ultra-low oxidation potential (PO₂=10¹⁶—10²⁶ atm) are offered. We propose the formation of such an environment by injection of ethyl alcohol in the reactor and interaction of its vapour with oxygen. Such conditions promote dissociation of oxides of almost any kind. Using this method, the pure, so-called ‘metals of life’ are obtained: Cu, Fe, Ni, and Co, which are used in medicine as the essential nutrients. In the case of chromium conversion, this process is completed with the synthesis of carbide phases. Production of pure Cr is possible by using the similar methodology with the help of oxygen pump. For identification of the reduced products, an X-ray phase analysis is used. The purity of the converted products is characterized by spectrochemical analysis. The experimental data are in a good conformity with the thermodynamic calculations of optimal temperature ranges of conversion reactions and the ratio of the initial ingredients.
format Article
author Mikadze, O.I.
Bagdavadze, J.I.
Dzigrashvili, T.A.
Maisuradze, N.I.
author_facet Mikadze, O.I.
Bagdavadze, J.I.
Dzigrashvili, T.A.
Maisuradze, N.I.
author_sort Mikadze, O.I.
title Thermodynamic Modelling of Oxide Conversion Processes for Metals of Life
title_short Thermodynamic Modelling of Oxide Conversion Processes for Metals of Life
title_full Thermodynamic Modelling of Oxide Conversion Processes for Metals of Life
title_fullStr Thermodynamic Modelling of Oxide Conversion Processes for Metals of Life
title_full_unstemmed Thermodynamic Modelling of Oxide Conversion Processes for Metals of Life
title_sort thermodynamic modelling of oxide conversion processes for metals of life
publisher Інститут металофізики ім. Г.В. Курдюмова НАН України
publishDate 2015
topic_facet Дефекты кристаллической решётки
url http://dspace.nbuv.gov.ua/handle/123456789/111710
citation_txt Thermodynamic Modelling of Oxide Conversion Processes for Metals of Life / O. I. Mikadze, J. I. Bagdavadze, T. A. Dzigrashvili, N. I. Maisuradze // Металлофизика и новейшие технологии. — 2015. — Т. 37, № 1. — С. 115-120. — Бібліогр.: 5 назв. — англ.
series Металлофизика и новейшие технологии
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AT bagdavadzeji thermodynamicmodellingofoxideconversionprocessesformetalsoflife
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AT maisuradzeni thermodynamicmodellingofoxideconversionprocessesformetalsoflife
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fulltext 115 PACS numbers:61.72.sd, 64.75.Lm,68.47.Gh,81.05.Je,81.65.Mq,82.30.Lp, 82.80.Ej Thermodynamic Modelling of Oxide Conversion Processes for Metals of Life O. I. Mikadze, J. I. Bagdavadze*, T. A. Dzigrashvili, and N. I. Maisuradze Georgian Technical University, 77 Kostava Str., 0175 Tbilisi, Georgia *Ferdinand Tavadze Institute of Metallurgy and Materials Science, 15 Kazbegi Ave., 0160 Tbilisi, Georgia In the presented work, the environmentally friendly production processes of pure metals via reduction from the respective oxides in the atmosphere of ultra-low oxidation potential (  2 16 O 10P 26 10 atm) are offered. We propose the formation of such an environment by injection of ethyl alcohol in the re- actor and interaction of its vapour with oxygen. Such conditions promote dissociation of oxides of almost any kind. Using this method, the pure, so- called ‘metals of life’ are obtained: Cu, Fe, Ni, and Co, which are used in med- icine as the essential nutrients. In the case of chromium conversion, this pro- cess is completed with the synthesis of carbide phases. Production of pure Cr is possible by using the similar methodology with the help of oxygen pump. For identification of the reduced products, an X-ray phase analysis is used. The purity of the converted products is characterized by spectrochemical analysis. The experimental data are in a good conformity with the thermody- namic calculations of optimal temperature ranges of conversion reactions and the ratio of the initial ingredients. У запропонованій роботі розглянуто екологічно безпечні процеси одер- жання чистих металів шляхом їх відновлення з відповідних оксидів у ат- мосфері з ультранизьким окиснювальним потенціялом (  2 16 O 10P 26 10 атм.). Ми пропонуємо створення такого середовища інжекцією етилового спирту в замкнений контур реактора внаслідок взаємодії пари спирту з киснем. Такі умови сприяють дисоціяції оксидів майже будь-якого виду. Цією методою одержано так звані «метали життя»: Cu, Fe, Ni и Co, які використовуються в медицині як поживні нутрієнти. У випадку конверсії оксиду хрому процес завершується синтезою карбідних фаз. Одержання чистого Cr можливе застосуванням подібної методології за допомогою ки- сневої помпи. Ідентифікація продуктів конверсії відбувається рентґено- Металлофиз. новейшие технол. / Metallofiz. Noveishie Tekhnol. 2015, т. 37, № 1, сс. 115—120 Оттиски доступны непосредственно от издателя Фотокопирование разрешено только в соответствии с лицензией 2015 ИМФ (Институт металлофизики им. Г. В. Курдюмова НАН Украины) Напечатано в Украине. 116 O. I. MIKADZE, J. I. BAGDAVADZE, T. A. DZIGRASHVILI et al. фазовою структурною аналізою, а їхня чистота контролюється спектро- хемічною методою. Експериментальні дані добре узгоджуються з термо- динамічними обчисленнями оптимальних температур конверсійних реа- кцій і молярних часток початкових інґредієнтів. В предложенной работе рассмотрены экологически безопасные процессы получения чистых металлов путём их восстановления из соответствую- щих оксидов в атмосфере с ультранизким окислительным потенциалом (  2 16 O 10P 26 10 атм.). Мы предлагаем создание такой среды инжекцией этилового спирта в замкнутый контур реактора в результате взаимодей- ствия паров спирта с кислородом. Такие условия способствуют диссоциа- ции оксидов почти любого вида. Этим методом получены так называемые «металлы жизни»: Cu, Fe, Ni и Co, применяемые в медицине как пита- тельные нутриенты. В случае конверсии оксида хрома процесс заверша- ется синтезом карбидных фаз. Получение чистого Cr возможно примене- нием подобной методологии с помощью кислородного насоса. Идентифи- кация продуктов конверсии происходит рентгенофазовым структурным анализом, а их чистота контролируется спектрохимическим методом. Экспериментальные данные находятся в хорошем согласии с термодина- мическими вычислениями оптимальных температур конверсионных ре- акций и молярных долей начальных ингредиентов. Key words: metals of life, oxides, ethyl alcohol, conversion. (Received June 3, 2014; in final version, August 14, 2014) 1. INTRODUCTION In contrast to the classical methods of metallurgical and chemical pro- cessing of ores connected with significant energy consumption and eco- logical stress, we would like to recommend a different, energy-saving and environmentally friendly technology affording production of pure ‘metals of life’ adopted in pharmaceutical industry [1]. These biologi- cally active metals of life take up position side by side in the fourth pe- riod of the Periodic Table of elements: 24Cr, 25Mn, 26Fe, 27Co, 28Ni, 29Cu, 30Zn. Content of most of them is negligible in the body, but absence of these elements leads to ailments. As a basis for the offered technology of pure metals, production from the corresponding oxides is the princi- pal possibility of creating gas environments with ultra-low partial pres- sure of oxygen in the closed volume of a reactor [2]. The accessibility level of rarefaction of oxygen (up to  10 28 atm) is significantly lower than dissociation tension of the oxides of any considered metals. 2. EXPERIMENTAL Since the purity of converted products is altered depending on purity THERMODYNAMIC MODELLING OF OXIDE CONVERSION PROCESSES 117 of initial materials (in our case, oxides), the basic oxide powders of the analytical purity ( 99.9%) is used. An installation for the creation and maintenance of partial pressure of oxygen ( 2OP ) within the re- quired range of 10 16—10 26 atm had been designed by the authors and described recently in [3]. The dynamics of the abrupt decrease of 2OP in the closed contour is a function of the reactor temperature and practi- cally is in progress up to the depressurization temperature of the reac- tor material. The optimal consumption of the ethyl alcohol is 0.2 mg per 1 litre of a closed atmosphere and its heating to 800C provides fall of 2OP to 10 22 atm. Increase of operating temperatures up to 1500C stipulates achievement of fine and deep rarefaction of oxygen,  10 28 atm. In such conditions, dissociation of practically each oxide becomes possible. At the same time, duration of the exposure process at fixed temperature does not influence the level of 2OP , and the most possible rarity is achieved at given instant. X-ray phase analysis of the converted oxides was performed using the HZG-4 diffractometer for X-ray powder diffraction analysis. Diffraction patterns are obtained using the CuK X-rays (  1.542 Å). The complete thermodynamic analysis of the reductive processes for these oxides is performed using the ASTRA-4 software. 3. RESULTS AND DISCUSSION A computer simulation of thermodynamic processes at general atmos- pheric pressure in the temperature range 1000—2000 K was performed in the case of Cr2O3. During the simulation, the mole correlation of the converted oxides and the reducing gas was chosen based on the follow- ing reaction: Cr2O3(cd)  4.5C2H5OH(gas). Among the probable condensed (cd) components, the following were considered: H2O, C, Cr, Cr2O3, CrO2, CrO3, Cr3C2, Cr7C3, and Cr23C6. Be- cause of plenty of gaseous connections of C—H—O system, only some of them were specified: Cr, CrO2, Cr2O3, CrN, and CrOH. The basic results of complete thermodynamic analysis are presented in the diagram. Concerning chromium conversion, it should be noted that we have not found any information on the complete thermodynamic analysis of Cr2O3 interaction with the ethyl alcohol. As well known, chromium possesses such a high chemical sensitivity to oxygen that it oxidizes at 1000C even in the condition of space evacuation, where 2 20 O 10 atP  [5]. Therefore, high temperature, ul- tra-low partial pressure of oxygen, and the increased consumption of the reducing agent are required for conversion of Cr2O3 (see reaction). Preliminary thermodynamic analysis of alcohol dissociation showed 118 O. I. MIKADZE, J. I. BAGDAVADZE, T. A. DZIGRASHVILI et al. that below 400 K gaseous methane, water vapour, and condensed car- bon precipitate, while at 450 K a partial dissociation of the methane takes place, and the content of the condensed carbon increases and ex- ceeds that of the condensed carbon available in the system. Since carbon exists among the possible condensed components, it is highly probable to suppose that convenient conditions are created for effective conversion of the oxides to pure metals or their carbide phas- es. Figure 1 shows the results of the analysis only in the temperature range 1000—2000 K because dissociation of chromium oxide does not take place below 1300 K. In the Cr2O3 conversion process above 1350 K, condensed chromium carbide Cr3C2 occurs, amounts to 30% of the mass, and remains unchanged up to 2000 K. The abrupt decrease of the condensed carbon content (from  20% to  0%) indicates at its inten- sive consumption during the synthesis of Cr3C2 and is optimal for ter- mination of the process. In order to check the thermodynamic calculations, some relevant results on NiO, CoO, CuO, and Fe2O3 conversions are shown in Table 1 as good examples of conversion of oxides of other metals of life [3]. However, the conversion process of chromium oxide completes via syn- thesis of carbide phases instead of precipitation of metal substrate. The matter is that in the case of ethyl alcohol injection, the presence of free carbon in the reaction zone causes the carbidization of conversed chromium. As should be noted here, the constructed installation for conversion of oxides allows creating a gaseous environment in two different ways: 1–using an oxygen pump [2], or 2–via injection of ethyl alcohol in the closed contour of the reactor [5]. In spite of the nearly, the same Fig. 1. Temperature dependence of the components concentration in the sys- tem: 1–Cr2O3, 2–C, 3–Cr3C2, 4–CO, 5–H2O. THERMODYNAMIC MODELLING OF OXIDE CONVERSION PROCESSES 119 evacuation rate of oxygen in the reactor, the deoxidizing abilities of these methods are completely different (see Tables 1 and 2). As it is clear from the Tables, the conversion process accelerates when the at- mosphere in the reactor is formed via injection of alcohols (Table 1). However, production of pure chromium is possible, if super-deep evac- uation is achieved using oxygen pump (Table 2). Taking into account the results shown in tables and the X-ray data, the obtained results on the complete thermodynamic analysis of chro- mium oxide conversion lead to the conclusion that the injection of ethyl alcohol is an efficient method for the formation of Cu, Ni, Co, and Fe condensates, while in the case of chromium oxide, the end prod- uct of conversion is its carbide–Cr3C2, instead of pure metal (see Fig. 2). 4. SUMMARY For the first time, it has been carried out a multicomponent thermody- TABLE 1. Parameters of metal complete reduction from their oxides by alco- hol injection method. Temperature, C Partial pressure 2O ,P atm Duration, min 1 5 10 15 20 60 700 10 21 Fe2O3 CoO 800 10 22 NiO CuO 900 10 23 NiO CuO 1000 10 24 NiO CoO TABLE 2. Parameters of metal complete reduction from their oxides by oxy- gen pump method. Temperature, C Partial pressure 2O ,P atm Duration, h 0.5 1.0 1.5 2.5 3.0 5.0 5.5 800 10 20 Cu2O 900 10 21 Fe2O3 1000 10 21 Cu2O 1100 10 21 Fe2O3 NiO NiO 1200 10 22 Fe2O3 CoO 1300 10 26 Cr2O3 1400 10 27 Cr2O3 120 O. I. MIKADZE, J. I. BAGDAVADZE, T. A. DZIGRASHVILI et al. namic simulation of chromium conversion process using ethyl alcohol. It is determined that the highest output of conversion products corre- spond to the temperature range 1350—1600 K. The molar ratio of chromium and ethyl alcohol is 1:4.5. During conversion of the active carbide-forming metals oxides, the synthesis of carbide phases takes place simultaneously with their re- duction. Production of such pure metal as chromium is possible using the oxygen pump. REFERENCES 1. E. Terletsky, Metals, Which Are Always with You (Moscow: Znanie: 1986) (in Russian). 2. O. Mikadze, L. Rukhadze, and B. Bulia, Georgian Engineering News, 1: 90 (2000) (in Georgian). 3. O. Mikadze, A. Kandelaki, J. Bagdavadze, and L. Rukhadze, Bulletin of the Georgian National Academy of Sciences, 7, No. 1: 37 (2013). 4. N. Vatolin, G. Moiseyev, and B. Trusov, Thermodynamic Modelling in High-Temperature Inorganic Systems (Moscow: Metallurgy: 1994) (in Russian). 5. E. Gulbransen and K. Andrew, J. Electrochem. Soc., 99, No. 10: 402 (1952). Fig. 2. 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