L. Ya. Osipova

Burning clinker for high-alumina cement in a rotary kiln

ConclusionsWe prepared clinker for high-alumina cement in a rotary kiln and determined the material balance in firing when preparing the raw mixtures with two methods: granulation in a plate granulator and briquetting on a roller press. It is shown that much less dust removal (4%) is ensured by firing the briquets obtained on the roller press. The aluminous cement obtained with this technology has a high graded strength.

Magnesia products from powders containing more than 94% MgO

ConclusionsUsing magnesite powders with large contents of magnesium oxide we obtained high-quality magnesite and periclase-spinel products. Periclase-spinel products obtained from the above powders satisfy the requirements of GOST for the PShSP type of product for the roofs of open-hearth furnaces and electric steel furnaces. Their thermal shock resistance is 7–15 water-heat cycles, compared with 5–7 heat cycles for ordinary periclase-spinel products, which is due to their structural features.

A corundum hydraulically hardening compound with addition of titanium slag for steel ladle vacuum degassers

ConclusionsA corundum hydraulically hardening compound with addition of titanium slag, the use of which in place of standard MKN-94 compound makes it possible to improve the physicotechnical properties of the concrete, to increase the wear resistance of the outer lining of circulation degasser nozzles, to decrease by 20–30% the labor costs for hot repairs and thereby to improve the working conditions of the operating personnel, and to reduce the consumption of repair materials has been developed.The compound developed combines the positive properties characteristic of corundum compounds with additions of baddeleyite and titanium dioxide but is less expensive than these compounds and makes it possible to obtain concretes with less shrinkage in heat treatment than with the use of the compound with addition of pure titanium dioxide.Broader tests of the compound with addition of titanium slag must be made in steel ladle vacuum degassers.

Unfired periclase-chromite refractories based on periclase and periclase-chromite shells (a discussion)

Etude de la preparation de refractaires non cuits de periclase-chrome, de leur composition et de leurs proprietes physiques, mecaniques et thermiques

Production of high-alumina cement clinker in a tunnel kiln

Presentation de la technique de preparation de clinker de ciment alumineux dans un four tunnel

Refractories from Verkhne-Shchugorsk bauxite deposits

Fabrication de briques refractaires a partir de ces bauxites, etude de leurs caracteristiques physico-chimiques

Increasing the effectiveness of firing of kaolin into chamotte in rotary kilns

ConclusionsBy calculation and semiproduction investigations it was established that in firing of kaolin into chamotte in a rotary kiln a significant increase in productivity, a reduction in fuel consumption, a decrease in dust burden, and an improvement in chamotte quality are obtained with briquetting of the raw material and heating of it to temperatures of occurrence of the dehydration reaction in a high-temperature layer heat exchanger using the heat of the outgoing stack gases.

Making ladle products using North Onezhsk bauxites

ConclusionsIt was found that the North-Onezhsk bauxites are promising raw materials for the production of highly resistant ladle bricks.We developed and mastered a technology in the BKO conditions for making ladle brick using these bauxites containing up to 6% iron oxides.In the lining of the steel ladles made with the use of bauxite chamotte, the bricks wear out 30–40% less than with ordinary ladle brick produced by BKO and the Chasov Yarsk Combine.

Pressing nozzles for high-speed steel teeming

ConclusionsThe Magnezit Combine has begun production of unfired pressed steel-teeming nozzles, with a channel diameter of 120 mm and height of 400 and 450 mm, made of magnesite paste.These nozzles have been put into service and adopted for high-speed top teeming of steel from a 330 ton ladle in the open-hearth shop of the KMW.

Magnesia nozzles for high-speed steelcasting produced by vibropressure molding

ConclusionsThe article describes the design development of steelcasting nozzles with a channel diameter of 120 mm and the development of the production technology for these nozzles. With these nozzles the stopper and batching device functions efficiently during the casting of rimmed and semikilled steel. The configuration and diameter of the nozzle channel undergo no changes in the process.The increase in the channel diameter from 100 to 120 mm results in the average linear speed at which the ingot mold is filled increasing from 3.8 to 5.2 m/min; in a decrease by 32% in the pouring time per melt (from 25 to 17 min) so that the work load on the cranes is reduced and the handling capacity of the casting bay is increased; in a 15% increase in the durability of the ladle lining which gives a saving of 100,000 rubles/yr as a result of lower refractories consumption; and in less spoilage of billets and strip steel.The end result is that the net cost of the rolled product decreases by 0.35 ruble/ton.