Using hoist 4 (see Fig. 2), vibrator 3 is placed on the upper binding strap of the half-car on one of the side walls.The terminal switch 7 is activated when the rollers of the support surface are touched, and this simultaneously hreaks the supply circuit of the jack's motor and switches on the electric circuit for controlling the vibrator.Using the control buttons that operate the debalance drive of the vibrator, which is located in the EKT equipment's operator cabin, we switch on the vibrator, and the residue of material is removed during continuous shifting of the assembly of half-wagons with the manipulator.After termination of the vibrator's work it is placed in the nonworking position in which it is maintained by means of the levers 8 of the cantilevers 9. Raising of the carriage is effected until the tensioning of the cable i0 is weakened, and this throws the switch ii breaking the supply circuit of the winch's motor.The unloading complex with the gantry-pit reception arrangement is operating at the Kudinovsk ceramics combine.The use of one assembly is giving an annual average saving of 20,000-26,000 rubles. CHECKING THE STRUCTURE OF FUSION-CAST BADDELEYITE--CORUNDUM BKCh PRODUCTS WITH THE RADIO-WAVE METHOD V. I. Gutman, Yu. A. Polonskii, V. G. Sloushch, and V. V. Kolomeitsev UDC 666.762.32.017:620.179.1Fusion-cast baddelyite-corundum refractories grade BKCh produced industrially have a particular chemical and phase heterogeneity across the section of the articles [i]. This is connected with the layering of the melt during setting and with subsequent formation of polycrystalline casting structures.

The construction of a department for the production of purer baddeleyite--cortmdum refractories, viz., grade BKCh, which are used in the production of optical and electrovacuum glass was completed in 1973. The construction plans were based on a design project prepared by the All-Uniun Institute of Refractories (AIR). The department was started up, the production trials were carried out, and the production technology of BKCh refractories was developed and introduced by the AIR jointly with the Podolsk Refractories Plant. * The work was carried out with account taken of the experience gained in the production of fusion-cast corundum and baddeleyite--corundum refractories [1; 2, pp. 35-116; 3, pp. 40-43].The starting materials for the production of the refractory are zirconia of grade , commercial alumina of grade GA85 (GOST 6912--64), a pure grade of silica , and a pure grade of sodium carbonate (GOST 83-63). According to the specifications the content of coloring oxides in the starting materials for the production of BKCh refractories should not exceed 0.05% for TiOp, 0.0i% for (CuO + NiO), 0.001% for CaO, and 0.07% for (Fe203 + Mn203 + Cr203).On their delivery at the Plant all starting materials for the baddeleyite--eorundum refractories were systematically subjected to spectral analysist to determine their content of coloring impurities (Table 1)

The Podolsk Refractories Factory (PZOI) produces baddeleyite--corundum refractories according to for the working zones of glass furnaces.Studies [2][3][4] showed that during the service of these refractories carbon monoxide, carbonic acid, and nitrogen separate in the glass, since the content of carbon and its oxides in the articles comes within the range 0.02-0.10%* [I].Contamination of refractories by undesirable carbon impurities is a result of the reaction of graphitic electrodes and oxides of the melt in refractory batch in the reducing conditions of electric-arc melting.In this case the carbon of the electrodes enters the melt as a result of direct transfer under the action of plasma jets, erosion, and oxidation of electrodes.Furthermore, the melt is contaminated by carbon during burning-in of the furnace with coke which occurs during single-shift working at PZOI.According to data in [3], a reducing atmosphere in the melt contributes to nitrogen absorption by bakor melt because of the formation of compounds such as nitrides and nitrocarbides of aluminum, zirconium, and silicon.In order to create oxidizing conditions and reduce the content in the articles of gasproducing impurities, experiments were done on the electric furnaces OKB 2126A in shop No. 4 of the factory using the plasma-arc method of melting.The tests were done with double-shift operation of the furnace.Before the start of the experimental meltings we created a double-shift store of sand blocks for assembling the molds, installed special electrodes with increased resistance, impregnated with borate solutions according to the technology of the Chelyabinsk Electrometallurgical Combine [5]; and furthermore the melting tank was insulated around the perimeter with shrinkage-head tiles and split blocks to avoid burnthrough in the lining.Burning-in of the furnace was done with ground coke in amounts of 40 kg. Melting was done with ordinary batch (articles grade BKCh-33).In the first shift the furnace was burnt-in, the melt was cleaned to remove coke, and the casting of ordinary articles was carried out.The experimental articles were cast in the second shift and the batch was melted with different electrical cycles.

No abstract

No abstract