SU1175922A1 - Refractory material - Google Patents

Abstract

Refractories vklyuchayugday forgsterit, periclase and spinels, characterized in that, in order povsheni stability to slurries of copper smelting production and heat resistance, it contains as spinels magnezialnohromistoglinozemistozhelezisty spinel Mg (Cr, Al, Fe) composition further clinoenstatite (di-Mg-SiOg) in the following ratio of components, May.%: Forsterite 39-58 Magnesia-chromistoglyno-3hemysto-ferruginous spinelid 30-40 ko Periclase 10-15 Clinoenstatitis 2-6

Description

The invention relates to refractories that can be used for the manufacture of linings for thermal units of copper smelting, nozzles for regenerators of marenovo furnaces and hearth heating furnaces. The purpose of the invention is to increase the resistance to slag copper production and heat resistance. The presence of magnesia-chromium-alumina-iron-spinning spheres of MgFe204 magnesioferrite, formed during the calcination process, contributes to the relaxation of thermal stresses arising in the refractory at high temperatures, prevents the structure from loosening and increases the total spinel content, thus increasing thermal stability and increasing thermal stability. products to slags of copper-smelting production. The indicated limits for the magnesian-chromium-aluminous-iron production of that spinelide in the refractory are due to the fact that when its content is less than 30 wt.%, The high temperature resistance is not ensured, since in microfragments the microfragment structure is not created during firing. With a spinelide content of more than 40% by weight, the slag resistance is not high, since loosening of the structure, reduction of the mechanical strength, an increase in the average pore size, and an increase in the capillary motion of the slag in the refractory, leading to its erosion, occur. An additional increase in heat resistance and slag resistance is also achieved due to the presence of clinoenstatite (o (, MgO SiQil) in the refractory material of a mineral with a low coefficient of linear thermal expansion, which contributes to the formation of a heat-resistant micro-fracture structure with an optimal average pore size, which significantly reduces the penetration of slag into refractory. The indicated limits of the content of clinoenstatite in the refractory are due to the fact that when its content is less than 2 wt.%, the heat resistance is not increased. and products due to an insufficient amount of phase with a low linear thermal expansion coefficient, which reduces the total thermal expansion coefficient of the refractory.Clinonestatite content of more than 6 wt.% does not provide high slag resistance of the products due to the increased amount of liquid phase, contributing to the corrosion of the refractory with copper and slag melts. Dp manufacturing of products used magnesia, magnesially silicate, silicate and spinel-containing materials in weight ratios, providing the phases The new composition of the proposed refractories. II p and mery s 1-7. Sintered dunite fractions of 3–0 mm, chrome – aluminous – iron – spinelide fractions of 3–0.5 mm, periclase – spinelide clinker of a fraction less than 0.063 mm, and quartzite of a fraction less than 0.063 mm were used as the initial components of the mixture. The compositions of the initial charge are given in table.1. Example Granular and dispersed forstertomagnetitoclinostatic clinker, granular chromite ore and dispersed sintered periclase were used as raw materials for the manufacture of refractories in the following ratio of components, wt.%: Forsteritomagnetitlinostatitic clinker of the 3-0 mm 48 syllable. Sintered periclase fraction less than 0.063 mm 17 Forstertomagnetite clinoer clinker fraction less than 0.063 mm8 The phase composition and properties of the refractor are given in Table 2. The manufacture of refractories produced as follows. From the initial components of a certain grain composition with predetermined ratios, dry mixtures were prepared in a paddle mixer. Then they were moistened with a solution of sulphite-yeast brew and stirred for 2-3 minutes. From the ready-made masses the products were pressed on a hydraulic press at a pressure of 100 MPa. The apparent density of the raw material was at least 2.84 g / cm. Then the products 3 were dried to a residual moisture content of less than 1% and burned in a tunnel kiln at ISGO-iesO C with an exposure at a maximum temperature of not less than 4 hours. The resulting products were determined according to the existing methods of Sem.table 2), How can be seen from the data of table 2, the proposed refractories have a heat resistance increased by 2-2.7 times and the coefficient of slagging is 1.5-2.4 times lower compared to the ave. 24 totip, while maintaining open porosity and strength of products. Production of the proposed oiHe- stops can be carried out under the conditions of existing production without significant capital expenditures. The use of these refractories will increase STOCK. linings and duration of campaigns of heating units, to intensify technological processes in furnaces of non-ferrous and ferrous metallurgy, to reduce the consumption of refractory products and the cost of repairs.

Proto15

68 type

Table 1

17

table 2

Claims (1)

FIREUPOR, including forsterite, periclase and spinelides, characterized in that, in order to increase resistance to sludge from copper smelting and heat resistance, it contains magnesiachrome alumina-iron spinel of the composition Mg (Cr, Al, Fe) 20 ^ H as an additional spinelide (clinoeustatite ( $ i-Mg * SiO _z ) in the following ratio of components, May.%: Forsterite 39-58 Magnesiachromistog alumina and iron spinel 30-40 Periclase 10-15 Wedge enstatitis 2-6 £ 11 .., 1175922>