V. V. Kolomeitsev

Checking the structure of fusion-cast baddeleyite-corundum BKCh products with the radio-wave method

ConclusionsOwing to the large dimensions and weight and also the high cost of BKCh articles, they should be quality controlled by nondestructive methods of the radiowave type. In the first case this method is useful for selecting BKCh articles for the most critical elements of the structure, e.g., the channel of tank furnaces.

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).