Refractories and Industrial Ceramics Vol. 50, No. 6, 2009 INVENTIONS Review prepared by the editorial staff of Novye Ogneupory Translated from Novye Ogneupory, No. 12 p. 61, December 2009. MAGNESIUM PHOSPHATE CEMENT Then by means of an extruder blast furnace blocks with a size of 600 600 300 mm are molded under a pressure of N. F. Kosenko and L. A. Vinogradova 50 kg/cm (5 MPa) at 135°C. The blocks are heat treated in RU Patent 2344101 gas chamber furnace followed by furnace cooling for six MPK S04V9/04 days. The preparation method for carbon-containing refrac- tory material is distinguished by the fact that in the charge Magnesium phosphate cement, including magnesium ox- there is an additionally ground iron, with the following ratio ide and orthophosphoric acid, is distinguished by the fact that of components, wt.%: 40 – 55 thermoanthracite, with a frac- it contains magnesium oxide processed in a ball mill for tion size of the skeleton-forming part of 1.25 – 2.25 mm, 6 – 10 min in the presence of 0.01 – 3% magnesium dihydro- 20 – 36 graphite, 16 – 21 coal-tar pitch, 8 – 15 silicon car- phosphate with the following ratio of components, wt.%: bide, 5 – 8 silicon metal, 0.8 – 1 aluminum oxide, 0.8 – 1 24.05 – 32.03 magnesium oxide, 67.97 – 75.95 orthophos- ground iron, and heat treatment is performed in gas atmo- phoric acid. sphere at 1200 – 1300°C for 400 – 450 h. Magnesium phosphate cement is distinguished by the Bulletin, No. 2, 685 (2009). fact that the magnesium oxide it contains is reactive magne- sium oxide, or caustic magnesite, or sintered magnesite. This magnesium phosphate cement relates to a phosphate METHOD FOR PREPARING FIRED binder material and may be used in the production of high- AND GRAPHITIZED CARBON MATERIAL temperature materials and coatings, magnesia unmolded re- fractories (ramming mixes and concretes). B. I. Davydovich, S. V. Polyakov, G. N. Romashina, V. V. Uleiskii, and V. P. Burtsev Inventions Bulletin: Utility Models, No. 2, 685 (2009). RU Patent 2344101 MPK S01V31/04 CARBON-CONTAINING REFRACTORY MATERIAL Method for preparing fired and graphitized carbon mate- AND ITS METHOD OF PREPARATION rials includes the fact that the press-mix is prepared by mix- L. N. Ruzhevskaya, N. P. Nonishneva, T. V. Khazova, ing carbon filler with pitch binder in a mixer with supply of and S. A. Podkopaev heat, it is crushed, pressed, the pressed billets are fired, im- pregnated with pitch, fired again, and graphitized. The RU Patent 2344105 method is distinguished by the fact that in the press-mix MPK S04V35/532, S04V35/81, S04V35/52 there is mixing in a rapid vertical mixer, after which it is The preparation method for carbon-containing refractory molded in a broaching press, the billet formed is crushed, af- material includes the fact that as a charge the following com- ter crushing the molded billet the ground mass is mixed with ponents are take: thermoanthracite, part of which has the a pitch binder, the components are mixed in a heated hori- fractions 0 – 0.5 and 0 – 1.25 mm, graphite fraction 0.005 zontal mixer with Z-shaped blades and only then pressed. and 0 – 1.25 mm, coal-tar pitch in the form of a fluid viscous During the first mixing the press-mix 20 – 25% of binder of resin, silicon carbide fraction <0.071 mm, silicon metal frac- the total amount of the press-mix is added to the charge, and tion <0.071 mm, and aluminum oxide powder. The loose in the second mixing 2 – 5% of the total amount of binder is components are weighed and mixed, pitch heated to added. The fired and graphitized material obtained has high 140 – 150°C is added to them and mixed for 30 – 45 min. physicomechanical properties: apparent density of “green” billets 1.73 g/cm , apparent density after graphitizing 1.76 g/cm , ultimate strength in bending 20.1 MPa. OOO Intermet Inzhiniring, Moscow, Russia. Subsequently we use the abbreviated name Bulletin. Bulletin, No. 3, 1176 (2009). 1083-4877095006-0473 © 2009 Springer Science+Business Media, Inc.
Refractories and Industrial Ceramics – Springer Journals
Published: Jun 8, 2010
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