SU507543A1 - The mixture for the manufacture of refractories - Google Patents

Description

The invention relates to the composition of the charge for the manufacture of non-shrinkable and non-shattering refractories, products and blocks of which can be used in the arches of March of new furnaces, vaults and walls of electric melting furnaces and other structural elements of technological units of metallurgical production operating at the sheratura tag ° over 1850 C and a static load of not more than 10 kg / cm. The known charge for the manufacture of fire stops, including magnesite and fused aluminum-magnesia spinel, has a shrinkage at 1750 ° C, low slag resistance and strength characteristics at high temperatures. The purpose of the invention is to increase the resistance of refractories. This is achieved by the fact that the charge for the manufacture of refractories contains additionally a mixture of magnesite and cast iron chips, respectively, from 72–7.3 wt.% To 22–28 wt.%, And a temporary bond in the following ratio of the indicated components, wt.%: Magnesite 2 O 42 Melted aluminum magnesia - agatna spinel fraction 2.0,5 mm, 20-33 mixture of magnesite and iron struizhi35-42 Transient communication zka3.5 Plavlenu1sG alyuyomagneziapn th floor shpilel chayut melting alumina-: feed additives anthracite and iron 1strulzhi followed vvodok the melt | magnesite Used amount , bespechivaet Mg content About 5-35% of the spinel. The mixture of the proposed mixture is obtained by mixing the initial components in the required amount. From the mixture obtained, the billet is pressed at a specific pressure of at least 1300 kg / cm, while the acidic 4x spat aluminum with a P: A1 ratio is used as a temporary bond at least 1.4 g / cm. I The introduction of finely ground magnesite and cast iron truss into the mixture is beneficial, but it affects the durability of non-spindle-like minerals during service. Possession of 1 volume of refractories in the interval to

achieved through solid phase; the action of periclaea, fused spinel; cast iron chips with the formation of a view of the unresponsive phase of a complex composition. In this cut, the shrinkage during sintering of rjepia: jja3 is compensated by the growth behind the cfeT formation.) High-refractory spinel phase composition. The resulting phase of the cement cements the vein and spinel grains, displaces the silicates from the grain boundaries into large pores, and thus promotes the formation of direct periclase – spinel – periclase contacts. This turn, in turn, leads to an increase in the cost of refractories in spucbee by 20–30% compared to lime: Products obtained from a charge containing magnesite fraction 2. 0.5 s.,: 35 wt.% Fused alumomagnes;;. spinel L-kpcii 2-0.5 mm 2S weight „%, the current is chilled component of the fraction less than O, O88 mm composition: 75 magnesia and 25 weight,% of cast-iron struchski, have physical and mechanical indicators that are eaten: Porosity is open, % 14.8

Compressive strength.

680

kg / cm

11: 1 s; cat1; e np; i 1о (), kg / cm ° r p v cc; -oR;: - oerb (1; .. water), and, olc4as: g ;;) - heat 7

Form m.; :: a toka about b e ethen and

iHrixTe. refractory materials manufacturing. vk1uchak; (L {al; -,; ygCh) Ez: 1T n aplena aln viOrv .arHeaii almo go; .iiikel, about tg and h and u; ls and tag. that, in order to increase the oTojiKocTii of refractories, it is in addition to: c: oncp; i -ir is a mixture of magnesite and black metal: hr, h ;, respectively; twenpo, 72-78 e.l .; to ..U; H HGcyu prvmennuYuRiBhaiw pop laejiyKiijieM Cx otioshenii i; :: CHOSHOGEB gov, yesLo

20-42

35-42 3-5