Forsterite products made from Kytlymsk dunites

Diesperova, M. I.; Bron, V. A.; Yatsus, N. P.; Kudryatseva, T. N.; Vydrina, Zh. A.; Androsenko, V. G.

doi:10.1007/bf01386857

Cited by 2 publications

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“…24, with a channel diameter of 70 mm, using lovsk dunite fractions 3-1 and i-0 m, without precalcination [7]. The finely milled constituent was used in the form of a mixture of dunite and periclase powder in the ratio 40:60.…”

Section: Fe~03mentioning

confidence: 99%

Production and use of forsterite refractories

Karklit

Dolgikh

1989

Refractories

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Do!gikh UDC 666.762.34 The importance of magnesia refractories for industries using refractories, and especially ferrous metallurgy, is continuously increasing. The treatment of certain parts of the resources of high-quality magnesite raw materials and the need to find new ways of supplying the raw material for the production of magnesia refractories make it desirable to examine the possibility of economizing on this raw material by using forsterite refractories. The latter may have value also for replacing aluminosilicate refractories, in some cases, with a simultaneous increase in the service life.The USSR possesses a large number of deposits of magnesia-silicate raw materials but the industry prepared only I00,000 tons of various forsterite articles and a small quantity of powders.The causes of this Iie mainly in the inadequate economic incentives for the development of this type of product~ The physicochemical principles of the technology for forsterite refractories have been worked out in the fundamental works, of A. S. Berezhnoi [i]. The constituent components of magnesia-silicate rocks and refractories made from them, in the main, are to do with the system CaO-MgO-FeO-Fe203-AI203-Si02.Examining the separate subsystems in this system it is possible to note that, in combintion with dicalcium silicate and forsterite, the melt develops at 1490~and as a result of the reaction of forsterite with A1203"2Si02 -at 1370~ In the latter case we note the formation of cordierite, with a melting tempreature of 1435~ In a mixture of forsterite and anorthite the melt is formed at 1320~ and the gehlenite at 1390~In the systems forsterite-diopside-anorthite, and forsterite-anorthite-metasilicate of magnesium, the minima on the liquidus surface are observed respectively at 1270~ and 1300~ On the diagram for MgO-FeO-SiO2 the lowest liquidus temperatures approximate to II00~ but ferrous oxide mainly enters into the composition of the solid solutions of substitution. On the MgO-Fe20~-SiO 2 diagram the eutectic temperature equals 1330~The adition to forsterite of 10% Mg2AI4Si~018 , CaMg (Si03)2, CaAl2Si2Os, and Ca2MgSi20 v leads to the formation of 10-20% melt at temperatures from 1360 to 1430~Only the addition of MgO to forsterite does not reduce the temperature of melt formation.The best refractories can be obtained in the system MgO-FeO-Fe2Oa-SiO 2 with an adequate amount of magnesium oxide for bonding the silica and iron oxides respectively into forsterite and magnesioferrite.A useful additive may be chromite, and the region of compositions with a concentration of melt of less than 10% at 1600 ~ in the system MgO-SiO2-Cr20a is somewhat extended, compared with MgO-SiO2- Fe~03.It follows from the above that forsterite refractories are inferior to periclase and periclase-spinel in their refractory properties, and apparently in their resistance to basic slags. At the same time there are a number of applications in which forsterite refractories may be succesful, including those subjected to the action of iron oxides.Natural f...

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Section: Fe~03mentioning

confidence: 99%

Production and use of forsterite refractories

Karklit

Dolgikh

1989

Refractories

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A project was developed for a production schedule for forsterite articles from unca!-cined Kytlymsk dunites in the refractories division of the Nizhnetagilsk metallurgical combine [3].

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“…The output of articles measuring 230 • 115 x 65 mm was done in accordance with the technological schedules [3]. The articles satisfied the demands of GOST 14832-79 (Table i).…”

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“…The studies showed that the use for the manufacture of forsterite refractories of dunites with a low degree of serpentinization, and hence with a low loss on calcination, yields high-grade articles without preliminary calcination of the raw materials.A project was developed for a production schedule for forsterite articles from unca!-cined Kytlymsk dunites in the refractories division of the Nizhnetagilsk metallurgical combine [3]. Separate batches of industrial specimens of forsterite goods which fully met the requirements of GOST 14832-79 were made.…”

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Possibility of the Industrial use of forsterite products from Kytlymsk dunites

1984

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Dunites from the Kytlymsk (lovsk) deposits, which in mineral composition are actually olivine rock [i], are of substantial interest as a raw material for magnesia--silicate refractories.Using these dunites would contribute to the extension of the raw-material base for the production of forsterite articles and would improve their quality.The main physicochemical, thermal, and other properties of these dunites were studied previously [2][3][4]. The studies showed that the use for the manufacture of forsterite refractories of dunites with a low degree of serpentinization, and hence with a low loss on calcination, yields high-grade articles without preliminary calcination of the raw materials.A project was developed for a production schedule for forsterite articles from unca!-cined Kytlymsk dunites in the refractories division of the Nizhnetagilsk metallurgical combine [3]. Separate batches of industrial specimens of forsterite goods which fully met the requirements of GOST 14832-79 were made.This article gives the results of industrial tests in the lining of heating units at the Verkh-lsetsk factory, using experimental forsterite articles that were made without precalcining the raw materials.The test batch weighing i0 tons was made at the experimental factory of the East Institute of Refractories using industrial samples of Kytlymsk dunites supplied by the planning office of Uralgeologiya~The output of articles measuring 230 • 115 x 65 mm was done in accordance with the technological schedules [3]. The articles satisfied the demands of GOST 14832-79 (Table i).The goods were tested in the overflow (pouring) and main ladles of the electric furnaces, and also in the "false" walls of the slag chamber of the open-hearth furnace in the steel melting shop.When the tests were being carried out in the DSP-25 electric furnace, transformer steel was being melted.The pouring process consisted of the following: liquid metal was poured from the furnace into the overflow (20-ton capacity) and partly in the main (30-ton capacity) ladles; then the metal was poured from the overflow ladle into the main one; since a layer of synthetic slag forms in the main ladle on the surface of the metal with a basicity of from 1.7 to 2.6, then during passage through it metal jets were additionally cleaned to remove harmful impurities. The dwell-time of liquid metal in the overflow ladle was 15 min, and in the main ladle 40 min.The wear of the lining in the steel-pouring ladles is mainly due to the sudden thermal shocks, and also the chemical and erosive effects of the liquid metal and slago When the tests were done in the overflow ladle it was lined with experimental forsterite articles in only the two upper courses, and the remaining part w~th the chamotte refractories that are normally used. The life of the lining was 35 heats (average for the shop), and in this case the residual thickness of the experimental and chamotte articles came within the range 60-70 and 40-50 mm, respectively.The working layer of the lining of the main ladle was made wi...

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Forsterite products made from Kytlymsk dunites

Cited by 2 publications

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Production and use of forsterite refractories

Production and use of forsterite refractories

Possibility of the Industrial use of forsterite products from Kytlymsk dunites

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