Synthesis of Spinel from Caustic Magnesite and Alumina Dust

Kashcheev, I. D.; Kamenskikh, V. A.; Zemlyanoi, K. G.; Shatilov, O. F.; Koptelov, V. N.; Ponomarev, Denis

doi:10.1023/b:refr.0000009035.42862.d4

Cited by 6 publications

(7 citation statements)

References 2 publications

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“…that use of this fine alumina dust makes it possible to prepare high-strength corundum ceramic (ultimate strength in compression up to 300 MPa), and spinel-periclase clinker (ultimate strength in compression up to 260 MPa) [36,37] without additional raw material grinding.…”

Section: Compoundmentioning

confidence: 99%

“…The high purity indices and fineness of alumina dust makes it possible to consider it a valuable technogenic raw material, suitable for producing a broad range of refractory and ceramic materials: high-alumina chamotte [36], fuzed and sintered corundum, spinels [37], mullite, codierite, anorthite, etc. This product is of considerable practical interest as a high quality raw material for producing proppant sands, high-alumina cement, aluminosilicate fiber, synthetic mica, catalyst carriers and abrasives.…”

Section: Alumina Calcining Furnace Dustmentioning

confidence: 99%

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High-alumina technogenic raw material

et al. 2011

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The substance composition, properties, and areas for use of five large scale varieties of technogenic high-alumina mineral raw materials are considered: aluminothermal slags, organic synthesis catalysts, abrasive slurries, aluminium slags and alumina dust. With combined use on the basis of this secondary raw material it is possible to produce more than twenty forms of different product:Currently in the Ural region a number of scientific organizations and industrial enterprises are participating in the fulfilment of Regional and Federal programs for processing technogenic formations. In 2008 the presidium of the Russian Academy of Sciences developed and approved a comprehensive program for study and assimilation of untraditional sources of mineral raw material, including technogenic formations. Main attention in the academic program is devoted to high-alumina natural and technogenic raw material sources: minerals of the kyanite, andalusite, silimanite, kaolinite and pyrophilite groups, aluminosilicate waste from thermal power engineering, high-alumina slags, slurries, dust, etc. Within the scope of fulfilling these programs there is research work, a study of substance composition and properties of mineral raw materials, and promising areas are being developed for use of the most valuable varieties of technogenic high-alumina materials. Among the latter are the following large-scale technogenic formations are of greatest practical interest (limits of Al 2 O 3 content, wt.%, are shown in brackets): aluminothermal slags in the production of the majority of ferroalloys and master alloys (50 -85), wastes of catalyst production or synthetic rubber (65 -75), corundum slurry from abrasive production (82 -96), dust from alumina calcining furnaces (90 -97), and metal-mineral waste from the production of secondary aluminum (60 -72).Technogenic "deposits" are primarily a potential raw material for synthesis of refractories, heat-resistant, and ceramic fuzed materials of different composition: alloyed corundum, mullite-corundum, spinel, codierite, etc. In view of the wide range of mechanical, thermal and chemical properties many varieties of technogenic mineral raw materials may be used effectively, not only in the refractory branch, but also in the production of abrasives, binders, heat insulation and other functional materials and objects [1 -3]. In order to develop effect areas for recycling secondary mineral resources complete information si necessary about the substance, grain size composition and physicochemical properties of each variety of technogenic polyphase and often polydispersed technogenic raw material. ALUMINOTHERMAL SLAGS FROM FERROALLOY AND MASTER ALLOY PRODUCTIONOAO Klyuchev Ferroalloy Plant is the sole enterprise in the RF and CIS producing more than thirty named unique ferroalloys and master alloys by the method of aluminothermal reduction of metals from oxides and other com-. 3 OOO Klyuchev Enrichment Plant, Dvurechensk, Sverdlovsk Region, Russia. 4 OAO UK RosStetsSplav, Yekaterinburg, Russia. 5 OOO NPO V...

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Section: Compoundmentioning

confidence: 99%

Section: Alumina Calcining Furnace Dustmentioning

confidence: 99%

High-alumina technogenic raw material

et al. 2011

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“…Such behavior is explained by the reactions (4) and (5) in which silicon carbide and corundum are formed. However, when the content of aluminum in the mixture is 50% or higher the ratio of the crystalline phases changes.…”

mentioning

confidence: 93%

“…Spinel ceramic finds wide applications in the manufacture of protective cases for thermocouples and crucibles for melting metals. Aluminomagnesia spinel is also a promising refractory material, used in heating equipment in its own form and with the addition of magnesia refractories during fabrication [2,3].The kinetic difficulties in the synthesis of spinel via the reaction MgO + Al 2 O 3 = MgAl 2 O 4 make it necessary to perform the process at high temperatures [4,5].It is possible to produce spinel, while lowering energy consumption, from abundant raw materials by means of SHS in mixtures which include a magnesium-containing component and metallic aluminum [6,7].Together with spinel, silicon carbide based materials are a promising group. Since it is difficult to produce a strong, formed, article from pure silicon carbide, refractory articles with a high content of carbide are produced using various binders.…”

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confidence: 99%

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Phase- and structure-formation processes during self-propagating high-temperature synthesis in the system Al – MgCO3 – SiO2 – C

Podbolotov

Dyatlova

2009

Glass Ceram

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Phase and structure formation processes occurring in the system Al -MgCO 3 -SiO 2 in the course of selfpropagating high-temperature synthesis are examined. The dependences of the structure and the phase composition of the composite materials formed on the ratio of the initial components are determined. It is shown that self-propagating high-temperature synthesis can be used to produce ceramic composite materials based on the spinel and silicon carbide phases.An effective method of obtaining composite materials is self-propagating high-temperature synthesis (SHS). SHS technology is a powder technology but it differs fundamentally from other powder technologies used in metallurgy by the fact that to realize synthesis powders are combusted and not heated in high-temperature facilities. The synthesis process proceeds by means of its own release of heat as a result of the interaction between the components of the initial mixture with valuable condensed products being formed, which makes it possible to decrease costs and reduce the energy consumption for production and, therefore, decrease prime costs [1]. Phase formation in the process of combustion of powdered mixtures occurs directly in the reaction volume, and the crystalline compounds formed grow into particles of other compounds. In the process it becomes possible to obtain composite crystalline phases, which is difficult to do under ordinary conditions. An example is a composition consisting of spinel and silicon carbide.Aluminomagnesia spinel MgO × Al 2 O 3 is a ceramic material with adequate mechanical strength and good corrosion and radiation resistance; it is widely used in metallurgy, machine building, instrument building, the chemical industry as linings for inductors and electric resistance furnaces, filters for melts, high-temperature electric insulators, and articles for other purposes. Spinel ceramic finds wide applications in the manufacture of protective cases for thermocouples and crucibles for melting metals. Aluminomagnesia spinel is also a promising refractory material, used in heating equipment in its own form and with the addition of magnesia refractories during fabrication [2,3].The kinetic difficulties in the synthesis of spinel via the reaction MgO + Al 2 O 3 = MgAl 2 O 4 make it necessary to perform the process at high temperatures [4,5].It is possible to produce spinel, while lowering energy consumption, from abundant raw materials by means of SHS in mixtures which include a magnesium-containing component and metallic aluminum [6,7].Together with spinel, silicon carbide based materials are a promising group. Since it is difficult to produce a strong, formed, article from pure silicon carbide, refractory articles with a high content of carbide are produced using various binders. Silicon carbide refractory materials and articles based on them possess a comparatively high electric and thermal conductivity, heat resistance, and durability under abrasion. They are not wetted by metal melts, possess high mechanical strength in the cold and heate...

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Spinel Production1

Kashcheev

Zemlyanoi

2017

Refract Ind Ceram

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Synthesis of Spinel from Caustic Magnesite and Alumina Dust

Cited by 6 publications

References 2 publications

High-alumina technogenic raw material

High-alumina technogenic raw material

Phase- and structure-formation processes during self-propagating high-temperature synthesis in the system Al – MgCO3 – SiO2 – C

Spinel Production1

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