SU1237651A1 - Refractory body - Google Patents

Description

The invention relates to ferrous and nonferrous metallurgy, in particular, to the composition of the refractory mass for the manufacture of articles and printed masses,

The circuit of the invention is an increase in mechanical strength under normal conditions and at temperatures of service.

uoo-ieoo c.

Hardening of the raw mix or products made from it under normal conditions (temperature) is ensured by the presence of semi-aquatic gypsum (CALO, -0.5 H20), and products calcined at temperatures above SSO c, due to the liquid phase resulting from the interaction of calcium oxide with clay and the melting of calcium sulfate (H50 ° C). The liquid (vitreous) phase envelops CaO grains and drastically reduces their hydration, thereby preventing cracking of the products.

The vitreous phase, when cooled, substantially enhances the structure of the articles by forming chemical bonds between calcium oxide and the vitreous phase (formation of calcium silicates).

Boundary values of 6-10% RRMs Determine the possibility of producing products using the semi-dry pressing method: with a lower content of RRM a defect is formed - repressing, and at a higher content, the mass becomes very plastic and is formed between the punch and the die. The boundary values of the graphite content (6-10%) are due to the strength of the mass. Graphite gives calcareous masses high resistance. The desire to increase its content in the mass is hampered by its ability to reduce the strength of products both under normal conditions (due to water non wettability) and at high temperatures (due to chemical inertness). Therefore, it is not water that is accepted as a technological bond yeast mash, graphite wetting is much better, t

The use of two components as reinforcing additives (gypsum semi-aqua and refractory clay) is due to the fact that semi-aqua gypsum strengthens the temperature as a binder at normal temperatures, and at high temperatures it interacts with the refractory

clay to form a liquid phase containing calcium silicates. Without the presence of sazod 2H., 0 refractory clay forms an insufficient collectiveness

the liquid phase (its refractoriness is 1710 C) at IooO-TbOO C,

For the preparation of the samples, limestone clinker (98.25% CaO) melted at 1900 ° C, limestone from the Komsomol Mineral Management Directorate (52.11% CaO), Pologia refractory clay (57.34% AljOj Ha calcined mass), flake graphite, gypsum LUVODN111Y, coal tar,

sulphite yeast mash, 2 g / cm.

The mass is produced in mixing runners (e.g., type M-115). Limes are pre-crushed, ground, and dispersed.

into fractions of 3-0.5 mm and smaller than 0.5i. Grain composition should be as follows: A0% fr. 3-0,5 mm, 60% fr.0,5mm.

The order of loading of mixing runners is as follows: known to, SDB, graphite, semi-aquatic gypsum, clay. After 7–10 minutes of mixing in the runners, the mixture can be used as a padding mass or for forming products using the semi-dry method on SM-143 or PK-630 type kneading presses, followed by drying to a residual moisture content of no more than 2–3%.

The compositions and properties of the masses by prototype and the proposed compositions are given in the table.

Lime

fused

clinker

fr, 3-0,5 mm

FR, less than 0.5 mm

Coal tar

Prototype

33 8, 1

50

17

1.5 0.3.

100%

31237651

Table continuation

6

12

9

6

Tesh

60

eight

. 14

ten

20/4 4.2 3.0

.The compiler of L. Bulgakov

Editor A. Dolinich Tehred V. KadarKorrektor I. Erdeyi

Order 3257/28 Circulation 640 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, st. Project, 4

Table continuation

eight

100%

53 10

16 11

to

100%

14.3 3.4 2.6

The mass of the proposed composition has high mechanical strength: under normal conditions up to 20.4 MPa, at 1400 C to 4.2 MPa, at 1600 C to 3.0 MPa.

Claims (1)

FIRE-RESISTANT MASS, including a component based on calcium oxide, a carbon-containing component and a binder, characterized in that, in order to increase the mechanical strength of the mass under normal conditions and at service temperatures of 14 ° -16 ° C, it contains limestone as a component based on calcium oxide, graphite as a carbon-containing component, sulfite-yeast, mash as a binder, and optionally refractory clay and gypsum gypsum in the following ratio of components, May.%: Limestone Graphite Sulfite53-57 6-10 yeast mash 6-10 Refractory clay 9-11 Gypsum semi-aquatic 12-16 SU <„, 1237651 i