SU1100272A1 - Charge for making smelting refractory products - Google Patents

Abstract

CHARGE FOR MANUFACTURING MELTED REFRACTORY PRODUCTS, containing refined slag and carbon from that ferrochrome and magnesite, which is so that, in order to reduce the shpatostoychivyy to sour shpak, it additionally contains high-chromium and converter slag. SiOz 16-20 AljO, 6-18 2.7-10.7 hegOe 0.7-2.3 CaO 8-11 MgO in the following ratio of components, wt.%: Pulp and carbon slag 50-80 ferrochrome Magnesite 10- 30 8 High-Chromium Converter 10-20 slag

Description

The invention relates to refractory materials of a certain industrial nature, in particular to batches for the production of fused cast refractories, using the Eoch for lining various aggregates of ferrous and non-ferrous metallurgy, in the chemical and ceramic industries.

Known for the manufacture of mineral products of composition 1J wt.%: Tails 70-88; magnesite 10-20, zirconia 2-10. The resulting refractories have the following composition, wt.%:

Forsterite 70-90

Chromite

pinhel 5-20

Difficult solutions 5-10

Closest to the offer is the mixture to obtain a fused refractory material on the basis of psh.ka pig and carbon

ferrochrome and calcined magnesite 2. The resulting refractory material from this mixture has a composition, wt.%:

Forsterite 85-95

Chromite

spinel 2-5

Complicated solutions 3-10 The disadvantage of these blends is TU, that the refractory materials obtained from them are characterized by low slag resistance to acidic slags, since their content of magnesite and solid spinels, which provide high slag resistance to refractory acidic fucks, does not exceed 20%.

The purpose of the invention is to increase the slag resistance of refractory products to JKUcmat slags.

This goal is achieved by the fact that a high-chromium converter slag is introduced into the charge for the manufacture of fused refractory products containing pig iron and carbon ferrochrome and magnesite; of the following composition, wt.%:

CrgO 50-65

SiO 16-20

Al O 6-18

. FejO, 2.7-10.7

CaO0.7-2.3

MgO8-11

in the following ratio of components, wt.%:.

Pulp and carbon ferro 50-80 chrome slag

Magnesite 10-30

High chrome

converter

slag10-20

Due to the addition of high-chromium converter slag in the phase composition of refractory products, chrome-spinel minerals increase, which increase the slag resistance of refractories to acidic slags.

Example. Pre-crushed slag of pig and carbon ferrochrome and high-chromium slags are mixed with magnesite powder and loaded into a plasma-arc furnace. Melting is carried out until the charge is completely melted, followed by discharge into the molds.

Table 1 shows the specific formulations of the proposed mixture.

Table 1

KoN 1on content of components, wt.%, In the composition of the mixture

1TA

PI

one

ten

20

thirty

ten

20

20

X-ray structural and phase analyzes of refractory products obtained from it are given in table 2.

table 2

The content of components, wt.%, In refractory products

Forsterite 40.8

49

66

59.2

51

34 As can be seen from the table below, in the phase composition of refractory products, magnesite-chromite spinels having a high slag resistance to acidic slags are within 34-59.2 Mac.% I whereas in the refractory material of the known mixture 5-20 wt.%: High chromium additives Converter slag of less than 10% causes the content of chromite rods in the resulting refractory material to be reduced to 14 wt.% and lower which do not provide the necessary resistance of refractories to acid spikes. With the addition of a high-chromium converter slag of more than 20 wt.%, Due to the high content of iron oxides in the refractory materials, olivine phases (Fe20 () are formed, which reduce not only the resistance of refractories, but also their other characteristics, such as melting point and mechanical strength ., Table 3 shows the properties of the refractory products obtained from the proposed mixture.Tablica 1 - Melting point, K Continued table.3 Porosity is open,% 3.2 3.7 2.4 Apparently density , g / cm3 3.84 3.87 3.82 Strength at s zhatii, MPa 217 204 228 Thus, addition of high-chromium converter slag into a known charge based slag pig and carbon ferrochrome and obrzhzhennogo magnesite affords charge with increased shlakoustoychivostyu to acidic slags obtain refractories of ferrochrome production waste and partially replace costly hromitomagnezitovye Refractory materials. It saves a significant amount of raw materials, materials containing refractory oxides of magnesium, chromium, aluminum and others, and gives The possibility of integrated use. calling expensive ishim chromite ores. . - “V. .

Claims (1)

Batch for the manufacture of molten refractory products, containing the tailings of conversion and carbon ferrochrome and magnesite, characterized in that, in order to increase the resistance to acidic joints, it additionally contains high-chromium converter slag: wt%. 50-65 16-20 6-18 2.7-10.7 0.7-2.3 8-11 Cr ₂ 0 ^ SiO ₂ Al 2 0-j FejO ^ CaO MgO in the following ratio of components, wt.%: Conversion and carbon spac ferrochrome 50-80 Magnesite; 10-30 Vysokochromis- first converter slag 10-20