D. B. Min'kov

Reducing the carbon content in baddeleyite corundum products

ConclusionsAn experimental batch of BKCh-33V articles amounting to 7.2 tons was produced for the working zones of glass furnaces. The content of carbon impurity in the experimental goods does not exceed 0.04%, which is a half of that in industrial articles.The optimum parameters of plasma-arc melting of the batch were determined in order to produce articles with a low-carbon content. Measures are recommended for setting up the industrial production of these products.

Stabilizing quartz slip in the production of immersion sheaths

ConclusionsA technology was developed for stabilizing quartz slip for making immersion sheaths at the Podolsk refractories factory using electrolytes, enabling us to reduce the slip preparation time by 19–22 h, reducing its viscosity with a reduction in the water content from 22 to 17–20%, reducing the loss of greenware. In the conditions of KTs-2 of the Novolipetsk plant, the experimental nozzles showed a resistance similar to that of nozzles obtained by the traditional method used at Podolsk.

Quartz ceramics made from thermoplastic suspensions

ConclusionsA technology was developed and introduced for making quartz sleeves (TU 14-8-233-77) by the hot-casting method using thermoplastic suspensions. This does not involve the use of preliminary firing in a filling of refractory powder to burn out the binder.The savings from using the new method are 28,000 rubles per annum.

Influence of the technological factors on the quality of quartz steelcasting nozzles

ConclusionsTo produce quartz nozzles of uniform vertical and transverse density by slip-casting the slip must be of optimal density (1.73−1.76 g/cm3) and the stabilization period of optimal length (at least 30 h).

Steel casting nozzles from quartz glass

ConclusionsProduction has been launched of immersion type steel casting nozzles by slip casting from quartz glass. The nozzles are very durable and suitable for casting various steels below the teeming level.

Technology for producing large dense kaolin blocks

ConclusionsThe Ukrainian Scientific-Research Institute of Refractories has developed the main technical parameters for obtaining dense kaolin products with relatively moderate specific pressing pressures (about 500 kg/cm2), The Podolsk Refractories Plant produced an experimental batch of kaolin blocks with a porosity of less than 12% based on chamotte made from Novoselitsk kaolin. The main properties of the kaolin blocks are better than those required by GOST for brick class-A produced for blast furnaces, and correspond to the properties of dense kaolin blast furnace brick.

Tunnel kiln for firing large refractory products

ConclusionsA tunnel kiln has been put into operation for firing large products in which cycles were worked out for firing blocks for the glass industry. When these products are being fired in the tunnel kiln loss is reduced by a factor of 10 compared with loss obtained when firing them in round furnaces. There are appreciable reductions in labor expenditure, and the working conditions are improved. Setting and unloading are mechanized.Location of the kiln under an open roof hinders operations.