A. A. Mukhin

Refractory tubes for protection of metal jets issuing from a steel-pouring ladle during continuous casting

ConclusionsAt the continuous-casting line at NLMW we have tested pouring with a protected stream of metal from the steel-pouring ladle with the aid of quartz and graphite-chamotte tubes. It was established that the optimum design of the protective device consists of a refractory tube 750 mm long in conjunction with a stationary tube fixed on the lid of the intermediate ladle. At the point of junction between the two tubes, inert gas is injected to give additional protection. The structure of the device for bringing the tube up to the ladle should ensure tight joining of the tube with the collector nozzle and mobility of the tube during pouring.

Making gate valve refractories for steel ladles using GK alumina

ConclusionsA technology was developed for making articles for the gate valves of steel casting ladles ensuring high service factors. It was found possible to use high-alumina chamotte instead of corundum.

The durability of acoustically tested SP-11-type mullite-corundum stoppers

ConclusionsAn investigation carried out at the Novolipetsk Metallurgical Plant of the performance of the SP-11-type mullite-corundum stoppers produced by the Semiluk Refractories Plant showed that the durability was highest in the case of stoppers with a resonance frequency of 10,000–12,000 Hz. The stoppers falling into that frequency range account for about 70% of the total output.Culling out the stoppers with resonance frequencies below 10,000 and above 12,000 Hz and the “deaf” stoppers by acoustic testing increases the performance reliability of the stoppers of pony ladles and lengthens their useful life by 0.25 melt.

Quartz-clay ramming compounds from the raw material of the Latnen deposits

ConclusionsIt was established that the materials from the Latnen deposits are suitable for the production of quartz—clay ramming compounds, which in the lining of steelcasting ladles are more durable than compounds prepared from loamy Chasov-Yar sand.A technology was developed for the production of quartz-clay compounds from the loamy sands of a subjacent layer (underlying the clay), and for the production of quartz-clay ramming compounds from overburden sand and the semiacid clay grades LT1PK, LT2PK, and LT3PK.The quality indices are optimal for compounds produced from sands with a low content of Al2O3 (0.7% or less), alkali (0.5% or less), and Fe2O3 (0.5% or less), and a semiacid clay in proportions which will give a total of 10–12% argillaceous component in the compound.

Vibration equipment for making refractories

ConclusionsA design was developed for an industrial vibroimpact installation for making refractories. The equipment has been introduced into production. A series of measures were studied and introduced, leading to increases in the working reliability of the vibration equipment, sharply reducing the noise level, increasing the effectiveness of densification, and reducing the transmission of oscillations from the foundation of the vibration equipment to the surrounding elements of the building.The production of various shapes and large silicon carbide products weighing up to 40 kg was developed in production conditions.

Using production scrap from alumina insulating refractories

ConclusionsA method was developed for making rational use of waste from the production of alumina lightweight insulating products. The bodies based on these waste products are recommended for lining the pedestals (stands or rigs) of cupola furnaces by casting with templates.The unfired corundum products which were prepared are also recommended for lining the bases of the furnaces. The unfired double-layer corundum refractories were obtained with a strengthened working surface.

Industrial development of vibroimpact molding of silicon carbide refractories

ConclusionsA technology was developed for the vibrocompaction of silicon carbide refractories. The efficiency of the process was confirmed in industrial conditions.The properties achieved by vibrocompaction in silicon carbide refractories and their uniformity of distribution appreciably exceeds similar characteristics for tamped, and to some extent pressed, refractories.Vibromolding equipment is very simple in design, of low metal content, low power rating and cost, and can be used to obtain product qualities at pressures of 1–2 kg/cm2 that are achieved in pressing only by pressures of about 1500 kg/cm2.The use of vibrocompacted silicon carbide slabs in the porcelain industry as kiln furniture increased the inter-repair periods for shelf cars for firing pottery.

Packeted delivery of refractories without pallets

ConclusionsA new method for delivering refractories in packets without pallets has been developed and introduced.

Rapid drying cycle for corundum insulating products

ConclusionsA drying cycle was developed for corundum insulating brick in metal molds directly after casting. The drying time was reduced by a factor of 7.

Fireclay-perlite lightweight products based on raw material from the latnensk deposit

ConclusionsA production technology has been developed for fireclay-perlite lightweight products with an apparent density of 0.4 g/cm3 based on raw material from the Latnenskdeposit. Adoption of this technology permitted the structure of the ware to be sharply improved, the duration of drying to be reduced, and the amount of breakage to be decreased.It proved feasible to fire the lightweight products at 1400–1420°C along with the plastically pressed fireclay refractories using an existing schedule.