Fig. 2. Appearance of the rammed hearth after 7 months of operation of the furmace.The saving with such a method of repair of the worn rammed hearth during 2 years of operation of the rotary furnace of Sinarskii Pipe Plant was 93,000 rubles. For the purpose of investigation of highly resistant refractories for use in the tuyere zones of the bottoms of converters with bottom oxygen blowing after semiproduction tests,* comparative tests were made of different domestic refractories under production conditions.
COMPARATIVE TESTS OF REFRACTORIES IN THE TUYERE ZONES OFTuyere refractories in the form of 280 x 225 • 190 mm blocks with a center channel under the 30 mm diameter tuyere were produced for the investigation at Magnesite Combine in TsMI-2. Blocks of type PKhK p e r i c l a s~h r o m i t e composition, type PShGP periclase with a spinel binder, type KhM chromite--periclase, KhPT, and type MKhVP periclase--chromite were produced.For production of the PKhK parts fired magnesite powder of the 3-1 and i-0 mm fractions and the finely ground fraction of fused periclase were used, for the PShGP refractories fused periclase powders of the 3-1 and i-0 mm fractions and finely ground fused periclase, for the KhM refractories chromite ore powders of the i-0 mm fraction, periclase of the 2-0 mm fraction, and finely ground periclase powder, for the KhPT refractories chromite ore powders of the 3-1 mm fraction, periclase of the 2-0 mm fraction, and finely ground periclase-chromite mixture, and for the MKhVP refractories fused periclase--chromite. The chemical compositions of the mixtures for production of the parts are given in Table i.The mixtures for preparation of the parts were prepared i n a mixing mill with moistening with a sulfite-~east mash solution with a density of 1.22 g/cm 3 at 45~The block parts were formed on a D-2240A hydraulic press with a pressure on the manometer of 18 MPa.The formed parts were placed on the furnace cars in the two upper rows of the charge and fired in a tunnel kiln.The properties of the parts are shown in Table 2.The blocks produced were tested in the bottom lining of a 22-ton converter with oxygen bottom-blowing at Chusovoi Metallurgical Plant.The installation of the blocks in the bottom is shown in Fig. i. The remaining portion of the bottom lining was prepared from MO-91 magnesite brick.
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