A new promising method for processing of serpentinites

Zulumyan, N. H.; Isaakyan, A. R.; Oganesyan, Z. G.

doi:10.1134/s1070427207060353

Cited by 31 publications

(7 citation statements)

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“…The series of studies carried out under the leadership of N.O. Zulumyan should be noted [5][6][7]. This research group developed a thermal-acid treatment method of serpentines based on their ability to form an active metastable magnesium silicate phase under heat treatment [7,8].…”

Section: Introductionmentioning

confidence: 99%

In Situ Control of Thermal Activation Conditions by Color for Serpentines with a High Iron Content

et al. 2021

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Serpentine heat treatment at temperatures of 650–750 °C yields magnesium–silicate reagent with high chemical activity. Precise and express control of roasting conditions in laboratory kilns and industrial aggregates is needed to derive thermally activated serpentines on a large scale. Color change in serpentines with a high iron content during roasting might be used to indicate the changes in chemical activity in the technological process. This study gives a scientific basis for the express control of roasting of such serpentines by comparing the colors of the obtained material and the reference sample. Serpentines with different chemical activity were studied by X-ray diffraction, Mössbauer spectroscopy, and optical spectroscopy. The color parameters were determined using RGB (red, green, blue), CIELAB (International Commission on Illumination 1976 L*a*b), and HSB (hue, brightness, saturation) color models. The color of heat-treated samples was found to be affected by changes in the crystallochemical characteristics of iron included in the structure of the serpentine minerals. The color characteristics given by the CIELAB model were in good coherence with the acid-neutralizing ability and optical spectra of heat-treated serpentines. Thus, in contrast to the long-term analysis by these methods, the control by color palette provides an express assessment of the quality of the resulting product.

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Section: Introductionmentioning

confidence: 99%

In Situ Control of Thermal Activation Conditions by Color for Serpentines with a High Iron Content

et al. 2021

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“…The methods used for processing of serpentine using hydrochloric acid [4,5] and nitric acid [6] to obtain end products such as magnesium oxide, red pigment, concentrate containing nickel, chromium and iron, and amorphous silica are characterized by similar practical disadvantages.…”

Section: Introductionmentioning

confidence: 99%

Researching of Sulfuric Acid Leaching of Magnesium From Serpentines

Dikanbayeva¹,

Auyeshov²,

Satayev³

et al. 2021

SGTS

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E d i t o r i n c h i e f ZHURINOV MuratZhurinovich, doctor of chemistry, professor, academician of NAS RK, president of the National Academy of Sciences of the Republic of Kazakhstan, general director of JSC "Institute of fuel, catalysis and electrochemistry named after D.V. Sokolsky» (Almaty, Kazakhstan) H = 4 E d i t o r i a l b o a r d: ABSAMETOV Malis Kudysovich, (deputy editor-in-chief), doctor of geological and mineralogical sciences, professor, academician of NAS RK, director of the Akhmedsafin Institute of hydrogeology and hydrophysics (Almaty, Kazakhstan) H = 2 ZHOLTAEV Geroy Zholtaevich, (deputy editor-in-chief), doctor of geological and mineralogical sciences, professor, director of the institute of geological sciences named after K.I. Satpayev (Almaty, Kazakhstan) Н=2 SNOW Daniel, Ph.D, associate professor, director of the labotatory of water sciences, Nebraska University (Nebraska, USA) H = 32 Zeltman Reymar, Ph.D, head of research department in petrology and mineral deposits in the Earth sciences section of the museum of natural history (London, England) H = 37 PANFILOV Mikhail Borisovich, doctor of technical sciences, professor at the Nancy University (Nancy, France) Н=15 SHEN Ping, Ph.D, deputy director of the Committee for Mining geology of the China geological Society, Fellow of the American association of economic geologists (Beijing, China) H = 25 FISCHER Axel, Ph.D, associate professor, Dresden University of technology (Dresden, Germany) H = 6 KONTOROVICH Aleksey Emilievich, doctor of geological and mineralogical sciences, professor, academician of RAS, Trofimuk Institute of petroleum geology and geophysics SB RAS (Novosibirsk, Russia) H = 19 ABSADYKOV Bakhyt Narikbaevich, doctor of technical sciences, professor, corresponding member of NAS RK, Bekturov Institute of chemical sciences (Almaty, Kazakhstan) H = 5 AGABEKOV Vladimir Enokovich, doctor of chemistry, academician of NAS of Belarus, honorary director of the Institute of chemistry of new materials (Minsk, Belarus) H = 13 KATALIN Stephan, Ph.D, associate professor, Technical university (Dresden, Berlin) H = 20 SEITMURATOVA Eleonora Yusupovna, doctor of geological and mineralogical sciences, professor, corresponding member of NAS RK, head of the laboratory of the Institute of geological sciences named after K.I. Satpayev (Almaty, Kazakhstan) Н=11 SAGINTAYEV Zhanay, Ph.D, associate professor, Nazarbayev University (Nursultan, Kazakhstan) H = 11 FRATTINI Paolo, Ph.D, associate professor, university of Milano-Bicocca (Milan, Italy) H = 28 News of the National Academy of Sciences of the Republic of Kazakhstan. Series of geology and technology sciences.

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“…compounds extracted from thermally treated and mechanically activated samples using a new approach to acid treatment of ser pentinized minerals [10,11].…”

Section: Introductionmentioning

confidence: 99%

The influence of mechanical treatment on the silicate network of talc

Zulumyan

Papakhchyan

Isahakyan

et al. 2012

Russ. J. Phys. Chem.

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INTRODUCTIONIt is known that, the most usual paragenetic talc forms finally produced in the process most often called steatitization are hydrothermally changed ultrabasic minerals and silica dolomites that underwent low stage thermal metamorphism [1]. It was found for many occurrences that steatitization, which follows serpentization, is a result of silicization and carboniza tion of serpentines or the transfer of СО 2 into them [1, p. 151; 2, p. 8]. It is therefore quite natural that, when these processes occur, silicate networks of serpentines, largely unchanged, become the anionic component of talc crystalline structure. Therefore, the peculiarities revealed in serpentines [3] should to a certain degree be inherent in talc.Serpentine peculiarities are first of all Si-O bonds with unusual strengths present in "hexagonal" rings of SiO 4 tetrahedra in silicate networks [3]. If siloxane bridges are formed at comparatively low temperatures (below 500°C), the bonds which form in them are inferior in strength to Si-O bonds of metasilicate chains passed into the silicate layer from primary ultrabasic minerals. Just the presence of such Si-O bonds which differ in electronic saturation in silicate networks of minerals causes their destruction under mechanical treatments (mechanoactivation) and also upon heating, when, starting from 400°C, the dehy dration of serpentines is accompanied by the destruc tion of their crystal lattices [3][4][5][6][7][8]. The degree and character of the destruction of silicate networks which result in different ratios between isolated ortho , oligo , and polysilicate components formed depends on both the ratio between primary ortho and metasil icate anions, which participated in the formation of serpentine silicate networks, and their distribution in silicate layers [9]. Note also the direct role played by hydroxyls, because the breakage of weak Si-O bonds is closely related to the detachment and formation of hydroxyl water [3].The talc silicate network is mainly borrowed from serpentine (Mg 6 [Si 4 O 10 ](OH) 8 ). It is therefore quite natural that the above reasoning concerning the spe cial features of serpentine silicate networks with cer tain restrictions imposed by the structure of talc (Mg 3 [Si 4 O 10 ](OH) 2 ) relates to talc silicate networks. It follows that it is quite reasonable to study the influence of mechanical treatment on talc silicate networks using the physicochemical approach applied to ser pentinites [3]. The results can be compared with the data on serpentinites.In view of this, the purpose of this work was to per form a physicochemical study of thermally treated and mechanically activated talc and quantitatively deter mine magnesium, silicon, etc. compounds extracted from thermally treated and mechanically activated samples using a new approach to acid treatment of ser pentinized minerals [10,11]. EXPERIMENTALWe performed chemical analysis of two different talc samples, Russian (I) and Taiwan (II). Their chem ical composition is given in Table 1.For mechanical activat...

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A new promising method for processing of serpentinites

Cited by 31 publications

References 0 publications

In Situ Control of Thermal Activation Conditions by Color for Serpentines with a High Iron Content

In Situ Control of Thermal Activation Conditions by Color for Serpentines with a High Iron Content

Researching of Sulfuric Acid Leaching of Magnesium From Serpentines

The influence of mechanical treatment on the silicate network of talc

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