SU1395609A1 - Refractory composition for lining rotary furnaces - Google Patents

Abstract

The invention relates to refractory material No. 1 m and can be used in the manufacture and repair of thermal achfegate linings of non-ferrous metallurgy, such as rotary kilns. The purpose of the invention is to increase the heat resistance and resistance to reagents of non-ferrous metallurgy. The mass contains, in wt.%: Refractory clay 30-47; high-chromium converter slag of ferroalloy production 40-50; magnesite powder 10-13; coxic 3-7. The heat resistance of the mass (water) is not less than 5-6 heat cycles, crucible eroding area 0.8-1.2 cm, crucible impregnation area 2.9-4.2 cm, porosity after firing at 1600 C 8.5-12.3 is open % and refractoriness 1750 C. 2 table. I and C

Description

with you

C35

The invention relates to refractory masses and can be used in the manufacture and repair of linings of thermal units of non-ferrous metals, for example, rotary kilns.

The purpose of the invention is to increase the heat resistance and mass stability; to non-ferrous metallurgy reagents.

The starting materials for preparing the samples of the proposed refractory mass were ground refractory clay (with an ACO3 content of 36.1 wt.%), High-chromium

ferroalloy converter slag

plant (SGD content, Oz-55.3 wt.%, fractions less than 4.0 mm), magnesite powder (MgO content 80.1 wt.%, fractions 0-3.0 mm) and coking (fractions less than 3.0 mm, ash content of 12.1 wt.%). The control sample was made according to the prototype. In total, six series of refractory mass compositions were manufactured.

The material composition of the raw materials used for the manufacture of the samples is given in Table. one.

Component

Suggested examples

Fire Clay 30 38 47

High-chromium converter slag of ferroalloy production

Slag carbon and pig ferrochrome ferroalloy production

Magnesite Powder1312 10

Koksik753

All test specimens were manufactured using the same ceramic technology, including mixing raw materials, pressing at a specific pressure of 100 MPa, drying and firing at 1600 ° C.

All samples were determined refractoriness (according to GOST 4069-80) and opened Table 1

The content of components, may.%, In the compositions.

Prototype

50

45 40

15

70 15

five

thou porosity (GOST 2409-80). Determination of resistance to reagents of nonferrous metallurgy was carried out using static crucible methods. As a reagent used cake containing, wt.%: Zn 20,2; Pb 4.2; Ca 2.5; Si 1.9; , 0; S 4,9; Zyug 8.1; CaO 2.5; ppt 33,5. The stability assessment was carried out by measuring the areas of impregnation and separation. The physicochemical properties of the crucible of which after heating the attached and known refractory mass

1350 ° C and then cooled.

are given in table. 2

Physicochemical properties

Refractoriness, C

Open porosity

after roasting at 1600 ° С,%

Thermal resistance (heating up to 1300 С, cooling water), thermal cycles, not less

Crucible eroding area, cm 0.8 1.2 0.9 3.5

Crucible area,

9 3.3 4.2 6.1

From the data table. 2 it follows that the proposed mass significantly exceeds the known resistance to non-ferrous metallurgy reagents.

Mass is prepared from inexpensive and non-deficient raw materials.

The use of a refractory mass as a protective surface in rotary kilns allows increasing the wear resistance of the lining and the duration of the kiln campaign by reducing abrasive wear, reducing chipping of the refractory, lining

due to the reduction of thermal shock to the base liner.

VNIRSHI Order 2461/23 Circulation 594

Random polygons pr-gie, Uzhgorod, st. Project, 4

are given in table. 2

table 2

Composition

Offered by

Prototype

1750

7.5

Claims (1)

Invention Formula Refractory mass for lining rotating furnaces, including high-chromium converter slag of ferroalloy production and magnesite powder, characterized in that, in order to increase heat resistance and resistance to non-ferrous metallurgy reagents, it contains an additional refractory and toxic content with the following ratio of components,% by weight : Fire Clay 30-47 High-chromium converter slag of ferroalloy production 40-50 Magnesite powder 10-13 Koksik3-7 Subscription