A basic monolithic lining of steel-teeming ladles for ladle treatment of steel

Demidenko, L. M.; Kuznetsov, Yu. D.; Demidova, Zh. N.

doi:10.1007/bf01397851

Cited by 2 publications

(1 citation statement)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…We evaluated the suitability of the bodies for monolithic linings starting from the following demands: compressive strengths after forming and drying should be not less than 0.05-0.i [2] and i0 N/mm 2, respectively; linear shrinkage after heat treatment at the service temperature (~1600~ should not exceed 1%; expansion of bodies during heating to service temperature not to exceed 3% [3]. The properties of the bodies are shown in Table 2 and Fig.…”

Section: -72)mentioning

confidence: 99%

Unmolded refractories of basic composition for monolithic linings of steel-casting and intermediate ladles

et al. 1990

View full text Add to dashboard Cite

At present the proportion of unmolded refractories in the total volume of ladle production equals less than 0.1% and by the year 2005 it is planned to increase to 30%.The development of new bodies will not only solve the problem of making high-grade types of steel, but will boost the resistance of the ladle linings to a level of 30-50 heats [i].Until recently the range of unshaped refractories made at the combine was limited. On a regular basis they produced guncrete concretes MMShT-1.2, as specified by , and constituents for air-setting concrete mixtures SKhP (TU 14-8- 60-72).Due to the introduction of new production capacity in the magnesite-powders department No. 2, it has become possible to improve the existing technology, and also to develop methods for making new types of refractory.A start has been made with the production of unshaped bodies grade MMShT-I.2, meeting the demands of TU 14-8-426-83, and designed for making and repairing monolithic linings for steel ladles.This article presents the results of an investigation into optimizing the existing compositions and also developing new bodies.The MMShT-I.2 body made at the combine (TU 14-8-415-82), including periclase scrap fractions 2-0 mm and chrome-ore fractions i-0 mm, possesses a low thermal insulating capacity, and low strength resistance.The composition was optimized by making certain additions to the body. Table I gives the compositions.The batch was mixed in laboratory runner mills, ensuring even distribution of the components, additives and slaking agent (water). Specimens were shaped at a pressure of i0 N/ mm 2, which was developed during the preparation of the monolithic lining by the ramming method, and sand slinging.Some of the specimens were treated at different temperatures. The properties were determined on specimens before and after heat processing.We evaluated the suitability of the bodies for monolithic linings starting from the following demands: compressive strengths after forming and drying should be not less than 0.05-0.i [2] and i0 N/mm 2, respectively; linear shrinkage after heat treatment at the service temperature (~1600~ should not exceed 1%; expansion of bodies during heating to service temperature not to exceed 3% [3]. The properties of the bodies are shown in Table 2 and Fig. i. Body No. 7, which includes finely milled periclase-cementite-phosphate mixture, has improved properties.

show abstract

Section: -72)mentioning

confidence: 99%

Unmolded refractories of basic composition for monolithic linings of steel-casting and intermediate ladles

et al. 1990

View full text Add to dashboard Cite

show abstract

Ways to increase the slag resistance of unfired siliceous articles for teeming ladle linings

Bulakh

Khvostishkova

1996

Refractories

View full text Add to dashboard Cite

Based on laboratory investigations and industrial tests, the expediency and efficiency of using unfired siliceous articles produced with addition of milled chromite to a quartz charge for linings of slag belts of teeming ladles is established.Teeming ladles are laid for the most part with chamotte articles produced by various refractory enterprises [1]. The lining of teeming ladles is often made of quartz-clay and sand-clay ramming mixtures applied by sandblasters; the binder is commonly liquid glass and orthophosphoric acid [2 -6]. In recent years teeming ladles, including those for out-of-furnace treatment of steel, are laid with basic refractories, namely, fired and unfired forsterite-containing articles, chromite-periclase articles, and periclase-spinellide articles [7 -11 ]. The endurance of the lining of the slag belt of a teeming ladle made of these refractories exceeds that of chamotte and high-alumina refractories by a factor of 2 -3.The Pervouralsk and Krasnoarmeisk Dinas Plants have organized production of unfired siliceous ladle articles based on a quartz charge and liquid glass [12]. The endurance of a lining made of unfired siliceous ladle articles used for casting converter steel is 20 -25 pourings with intermediate repair of the lining of the slag belt after 12 -15 pourings.The present article presents results of an investigation aimed at increasing the slag resistance ofunfired siliceous ladle articles. In laboratory experiments we tried to reach this goal by introducing widely available additives into the quartz charge while maintaining the high properties of the refractories required for operation in teeming ladles. For comparison, we prepared specimens from the charge used by the Krasnoarmeisk Dinas Plant for the production of unfired siliceous articles for linings of teeming ladles (charge 0).In order to eliminate the effect of fluctuations in the ~ain composition of the charges on the properties of the specimens, milled Ovruch quartzite was preliminarily sieved into individual fractions (2 -3, 1 -2, 0.5 -1, and < 0.5 mm), and the charge was additionally mixed with quartzite of a fraction finer than 0.09 mm milled in a tube mill.Ukrainian Research Institute of Refractories, Kharkov, Ukraine.The grain composition of the charge was corrected using specific amounts of different quartzite fractions. It included 15% fraction 2 -3 mm, 25% fraction 1 -2 mm, 10% fraction 0.5-1 ram, and 50% fraction finer than 0.5 mm, 30% of which was f'mer than 0.09 mm.The additives were Kimpersaisk chromite of a fraction finer than 3 mm, Saranovsk chromite of a fraction finer than 0.5 mm, periclase of a fraction finer than 0.09 mm, and scrap of chromite-periclase articles of a fraction finer than 0.5 mm. In order to remove oil and moisture the slurry was preliminarily fired at 850°C. The compositions of the charges with the aforementioned additives are presented in Table 1. In preparing the siliceous mixtures 7.5% (above 100%) liquid glass

show abstract

A basic monolithic lining of steel-teeming ladles for ladle treatment of steel

Cited by 2 publications

References 0 publications

Unmolded refractories of basic composition for monolithic linings of steel-casting and intermediate ladles

Unmolded refractories of basic composition for monolithic linings of steel-casting and intermediate ladles

Ways to increase the slag resistance of unfired siliceous articles for teeming ladle linings

Contact Info

Product

Resources

About