Dependence of the structural and rheological properties of a refractory vibrocasting low-cement alumina-chromia castable and the properties of samples from it on the type of dispersant additives
Abstract
The effect of a new dispersant additive (on a polycarbonate basis) in comparison with a known additive based on polyethylene glycol on the structural and rheological properties of low-cement alumina-chromia castables with a moisture content of 4.5 % (flowability during vibration of freshly prepared castables and the kinetics of changes in the strength of their structure depending on holding time) and on the main properties of castables has been studied.
Studies of the freshly prepared castables flowability during vibration have established that the additive based on polyethylene glycol has a 1.3 times greater thinning ability compared to the additive on a polycarbonate basis, but the latter is also suitable for the manufacture of vibrocasting aluminachromia castable. It has been shown that the shelf life of the mass with the addition based on polyethylene glycol is 5.5—6.0 hours, and the mass with the addition on the polycarbonate base is 3.0—3.5 hours. During the indicated time, these masses are still mobile and suitable for vibration casting.
The formation mechanism of a coagulation-condensation-crystallization structure in the mass with the dispersant additive based on polyethylene glycol has been established. The final mechanism of structure formation in the mass with the dispersant additive on a polycarbonate basis is to be studied.
It was shown that with the introduction of additives studied in this work into the low-cement alumina-chromia castable, castable samples with the additive based on polyethylene glycol were characterized by significantly higher property indices than castable samples with the additive on a polycarbonate base, however, the latter samples also have property indices that meet the specified requirements of the technical specifications. The properties of prepared dried unfired samples with the additive based on polyethylene glycol and on a polycarbonate base, respectively: apparent density — 3.12 and 2.93 g/cm3; cold crushing strength after hydration hardening for 7 days — 64 and 56 N/mm2.
The properties of samples after firing at a temperature of 1580 °C: apparent density — 3.06 and 2.91 g/cm3; open porosity — 19.8 and 21.9 %; cold crushing strength — 196 and 70 N/mm2, respectively, with the additive based on polyethylene glycol and on a polycarbonate basis. But the properties of samples with the additive on a polycarbonate base are quite high, and it can be used, if necessary, as an alternative additive.
As a result of the carried out research, the raw material base for the production of coarse-grained alumina-chromia castable and castable products from it has been expanded.
References
Примаченко В. В. Исследование процессов образования коагуляционных структур в крупнозернистых тиксотропных массах. Огнеупоры. 1990. № 5. С. 2—5.
Primachenko V. V. Issledovanie protsessov obrazovaniya koagulyatsionnykh struktur v krupnozernistykh tiksotropnykh massakh [Investigation of the formation processes of coagulation structures in coarse-grained thixotropic masses]. Ogneupory Refractories. 1990, no. 5, p. 2—5 (in Russian).
Хромсодержащий низкоцементный бетон для футеровки реакторов производства технического углерода / Т. Г. Гальченко и др. Зб. наук. пр. ВАТ «УкрНДІвогнетривів імені А. С. Бережного». Харків : Каравела, 2005. № 105. С. 112—121.
Gal'chenko T. G., Shulyk I. G., Shlyakhova T. M., Privalova N. G. Khromsoderzhashchiy nizkotsementnyy beton dlya futerovki reaktorov proizvodstva tekhnicheskogo ugleroda [Chrome-containing low-cement concrete for lining of techcarbon production reactor]. Zb. nauk. pr. VAT "UkrNDIVognetryviv imeni A. S. Berezhnogo" [Coll. Sci. Proc. of OJSC "The Ukrainian research institute of refractories named after A. S. Berezhnoy"]. Kharkov, Karavela Publ., 2005, no. 105, pp. 112—121 (in Russian).
Шихта для виготовлення високовогнетривкого бетону : пат. 77552 Україна : МПК С04В 35/66, С04В 35/101, С04В 35/105 / Шулик І. Г., Гальченко Т. Г., Шляхова Т. М. ; заявник і патентовласник ВАТ «УкрНДІВ імені А. С. Бережного». № а 200500036 ; заявл. 04.01.2005 ; опубл. 15.12.2006, Бюл. № 12.
VAT "UkrNDIV imeni A. S. Berezhnogo" [OJSC "The Ukrainian research institute of refractories named after A. S. Berezhnoy"]. Shy`xta dlya vy`gotovlennya vy`sokovognetry`vkogo betonu [Batch for the manufacture of high-refractory concrete]. Inventors: Shulyk I. G., Gal'chenko T. G., Shlyakhova T. M. Appl: 2005-01-04, no. а200500036; publ: 2006-12-15, Bull. no. 12. IPC С04 В 35/66, С04В 35/101, С04В 35/105. Patent Ukraine, no. 77552. (in Ukrainian).
Корундохромоксидные огнеупоры и низкоцементный хромсодержащий корундовый бетон для службы в реакторах производства техуглерода / В. В. Примаченко и др. Новые огнеупоры. 2009. № 4. С. 44.
Primachenko V. V., Martynenko V. V., Shulyk I. G., Gal'chenko T. G., Shlyakhova T. M., Grineva N. I. Korundokhromoksidnye ogneupory i nizkotsementnyy khromsoderzhashchiy korundovyy beton dlya sluzhby v reaktorakh proizvodstva tekhugleroda [Alumina-chromia refractories and low cement chromium-containing corundum castable for service in the production reactors of technical carbon]. Novye ogneupory New refractories. 2009, no. 4, p. 44 (in Russian).
Шихта для виготовлення високовогнетривкого бетону : пат. 88218 Україна : МПК С04В 35/101, С04В 35/66, С04В 35/105 / Шулик І. Г., Гальченко Т. Г., Шляхова Т. М., Процак О. Б. ; заявник і патентовласник ВАТ «УкрНДІВ імені А. С. Бережного». № а 200800173 ; заявл. 03.01.2008 ; опубл. 10.07.2009, Бюл. № 13.
VAT "UkrNDIV imeni A. S. Berezhnogo" [OJSC "The Ukrainian research institute of refractories named after A. S. Berezhnoy"]. Shy`xta dlya vy`gotovlennya vy`sokovognetry`vkogo betonu [Batch for the manufacture of high-refractory concrete]. Inventors: Shulyk I. G., Gal'chenko T. G., Shlyakhova T. M., Protsak O. B. Appl: 2008-01-03, no. а200800173; publ: 2009-07-10, Bull. no. 13. IPC С04В 35/101, С04 В 35/66, С04В 35/105. Patent Ukraine, no. 88218. (in Ukrainian).
Unshaped and Shaped Refractories for Carbon Black Production Reactors Lining / V. V. Primachenko et al. Proc. of the Sixth Int. Symposium on Refractories, Zhengzhou, China, 18—21 Oct. 2012. Zhengzhou, 2012. P. 272—275.
Primachenko V. V., Martynenko V. V., Shulyk I. G., Gal'chenko T. G., Grineva N. I. Unshaped and Shaped Refractories for Carbon Black Production Reactors Lining. Proc. of the Sixth Int. Symposium on Refractories (18—21 Oct. 2012, Zhengzhou, China). Zhengzhou, 2012, pp. 272—275.
Шихта для виготовлення високовогнетривкого бетону : пат. 110518 Україна : МПК С04В 35/10, С04В 35/66, С04В 35/105 / Примаченко В. В., Мартиненко В. В., Рищенко С. І., Шулик І. Г., Гальченко Т. Г., Процак О. Б. ; заявник і патентовласник ПАТ «УКРНДІВ ІМЕНІ А. С. БЕРЕЖНОГО». № а 201312553 ; заявл. 28.10.2013 ; опубл. 12.05.2015, Бюл. № 9.
PAT "UKRNDIV IMENI A. S. BEREZHNOHO" [PJSC "THE UKRAINIAN RESEARCH INSTITUTE OF REFRACTORIES NAMED AFTER A. S. BEREZHNOY"]. Shy`xta dlya vy`gotovlennya vy`sokovognetry`vkogo betonu [Batch for the manufacture of high-refractory concrete]. Inventors: Primachenko V. V., Martynenko V. V., Ryschenko S. I., Shulyk I. G., Gal'chenko T. G., Protsak O. B. Appl: 2013-10-28, no. а201312553; publ: 2015-05-12, Bull. no. 9. IPC С04В 35/10, С04 В 35/66, С04В 35/105. Patent Ukraine, no. 110518. (in Ukrainian).
Сайт ТОВ «БелСКТ — Стандарт». URL : https://gskp.by/produkcija/item/dobavka-razzhizhitel-syrevogo-shlama-khidetal-42-01-147659 (дата звернення: 11.08.2021 р.).
Company site "BelSKT — Standard". Available at: https://gskp.by/produkcija/item/dobavka-razzhizhitel-syrevogo-shlama-khidetal-42-01-147659 (accessed 11.08.2021).
Диспергатори Castament. URL : https://www.dispersions-pigments.basf.com/portal/streamer?fid=823874 (дата звернення: 11.08.2021 р.).
Dispersants Castament. Available at: https://www.dispersions-pigments.basf.com/portal/streamer?fid=823874 (accessed 11.08.2021).
ISO 1927—4: 2012 (E). Monolithic (unshaped) refractory products—Part 4 : Determination of consistency of castables. Geneva : ISO, 2012. 8 p.
ISO 1927—4: 2012 (E). Monolithic (unshaped) refractory products — Part 4: Determination of consistency of castables. Geneva, ISO Publ., 2012, 8 p.
Ребиндер П. А. Процессы структурообразования в дисперсных системах. М. : Стройиздат, 1966. 312 с.
Rebinder P. A. Protsessy strukturoobrazovaniya v dispersnykh sistemakh Structure formation processes in dispersed systems. Moscow, Stroyizdat Publ., 1966. 312 p. (in Russian).
Урьев Н. Б. Высококонцентрированные дисперсные системы. М. : Химия, 1980. 320 с.
Ur'ev N. B. Vysokokontsentrirovannye dispersnye sistemy Highly concentrated dispersed systems. Moscow, Khimiya Publ., 1980. 320 p. (in Russian).
Фролов Ю. Г. Курс коллоидной химии. М. : Химия, 1982. 400 с.
Frolov Yu. G. Kurs kolloidnoy khimii Colloidal chemistry course. Moscow, Khimiya Publ., 1982. 400 p. (in Russian).
Исследования микроструктуры в глиноземистых и глиноземохромоксидных суспензиях с добавками диспергаторов / В. В. Примаченко и др. Зб. наук. пр. ПАТ «УКРНДІ ВОГНЕТРИВІВ ІМ. А. С. БЕРЕЖНОГО». Харків : ПАТ «УКРНДІ ВОГНЕТРИВІВ ІМ. А. С. БЕРЕЖНОГО», 2012. № 112. С. 23—33.
Primachenko V. V., Karjakina E. L., Shulyk I. G., Galchenko T. G., Grineva N. I. Issledovaniya mikrostruktury v glinozemistykh i glinozemokhromoksidnykh suspenziyakh s dobavkami dispergatorov [Microstructure researches in alumina and alumina-chrome oxide suspensions with dispergate additives]. Zb. nauk. pr. PAT "UKRNDІ VOGNETRIVІV ІM. A. S. BEREZhNOGO" [Coll. Sci. Proc. of PJSC "THE URIR NAMED AFTER A. S. BEREZHNOY"]. Kharkiv, PAT "UKRNDІ VOGNETRIVІV ІM. A. S. BEREZhNOGO" Publ., 2012, no. 112, pp. 23—33 (in Russian).
This work is licensed under a Creative Commons Attribution 4.0 International License.
