SU1210965A1 - Mixture for manufacturing heat-insulating plates - Google Patents

Description

12

The invention relates to ferrous metallurgy, in particular, to the compositions of the mixtures used to make heat insulating plates for the warmth of a near part of a steel ingot when casting it into granaries.

The purpose of the invention is to increase heat resistance and erosion resistance of plates.

The granulated blast furnace slag used for the preparation of the proposed pshak-forming mixture, and the refractory clay are refractory fillers. Refractory clay, in addition, serves as a component that neutralizes raezhi-. The bonding effect used in the casting of slag-forming mixtures on granulated blast furnace slag contained in the heat-insulating plate.

Cellulose paper waste (scop) is an organic fibrous material that provides sufficient mechanical strength for the plates of the proposed thermal insulation mixture.

Graphite in the proposed composition plays the role of a chemical additive that reduces the effect of the diluting effect of exothermic sclacic mixtures used in steel casting on the granulated blast furnace slag contained in the composition.

Along with sulphite-alcohol barda, liquid glass, synthetic resins and other binder materials can be used as a binder in the proposed mixture.

When the content of the granulated blast shpak in the proposed mixture is below 45.5 wt.%, The heat insulation of the heat insulating plates made from it deteriorates, and when the slag content in the mixture is 60 mass%, the strength characteristics of the heat insulation plates after casting and the head ingots decrease. increases.

When the clay content in the proposed mixture is less than 15 wt.%, The heat insulating plates lose contact with the metal after contact with the liquid metal and fall off the ingot, increasing the head cut when it is rolled and increasing the flow rate of the following: thinning agent 9652

The effect of the exothermic opaque mixture on granulated blast furnace slag in the slab. When the content of refractory clay in a mixture of more than 30 wt.%

5, the heat insulating plates have an increased volumetric weight, which negatively affects their heat insulating properties and head trimming when rolling ingots on a pressing mill

0 increases. Experimental molding of the plates showed that the proposed clay content in the slip does not cause any difficulties in removing excess moisture, which is explained by the presence of a fraction of 0.5-5.0 in the mixture of granulated blast-furnace slag em not less than 70%), ensuring sufficient porosity of the plate.

0 The waste content of the pulp and paper space (osprey) in an amount less than 8 wt.% Does not provide heat insulating plates with sufficient mechanical strength. The increase in the content of the osprey above 15 wt.% Is impractical because it leads to an increase in the strength characteristics of the plates.

30 When the content of graphite in the proposed mixture is less than 0.5 wt.% 5, the head cut during rolling increases kz due to the partial softening and melting of granulated blast furnace slag in the heat-insulating slab under the action of the decomposing component (for example, fluorspar) exothermic slag mixture. With an increase in the content of graphite content of more than 2 vol.%, An increase in the neutralizing effect of the diluting agent is not observed: the VIA used in the casting of dial-up mixtures,

.five

The content in the proposed composition of sulfite-alcohol stillage in the amount of 9.0–15.0 wt.% Ensures the obtaining of optimal characteristics of heat insulating plates.

In tab. 1 shows the compositions of the tested known (1) and proposed (3,4,5,9,10,12,15,16 and 19) mixtures,

g, j and taksle mixtures and compositions, the content of components in which is outside the proposed limits (2,6,7,8, 11,13,14,17,18,20).

The preparation of the proposed mixture and the manufacture of heat insulating plates from it is carried out as follows.

A skop (100 kg) and water are fed to the hydraulic diluent and mixed for 10-20 minutes. The prepared skop is served in a consumable stirrer, where it is mixed with granulated domain putty (500 kg), sulfite-alcohol bardoy (140 kg) and graphite (10 kg).

The components are mixed for 10-15 minutes. Then a mixture of humidity 70jt5% is fed to the molding tables connected to a vacuum pump. The molded plates are dried in tunnel dryers for 24 hours at 120-160 s. Ready heat insulating gits are installed in 18-ton molds (slab-like, wider downwards) and

75

65

60

50

45.5

44.5

46

60

60

50

50

50

50

55.

ten

9

eleven

12

15

15

13

13

12

9

7

eight

sixteen

eleven

ten

1210965. "

Water casting steel using exothermic shnoobrazuyuschey mixture.

In tab. 2 shows the results of testing 5 mixtures whose compositions are listed in Table. one.

As follows from the table below. 2 DyenEx, the proposed mixture due to the increased heat resistance and erosion resistance of the plates made from it, makes it possible to undress the ingots earlier, which reduces the head trim of cast billets by 0.7%

 5 and reduce the consumption of molds by 1.1 kg per 1 ton of cast metal. At the same time, higher characteristics of the heat resistance of the plates after casting in the process of crystallization of the metal of the ingots provide an increased (15-30 wt.%) Content of the refractory resistance of the plates.

Table 1

20

10.5 10

12 12 14 10 9

12 12 10 14 14 13

1.0 1.0 1.0 0.5 0.5 0.5 0.5 1.0 1.0 1.0 1.0

1.0 1.0

1.0

Continuation of table

Table 2

7.2-12.9 8.3-14.9 9.3-16.4 8.6-15.1 9.3-16.4 9.3-16.4 9.3-16.4

The same 13.9

Satisfactory 13.4

Same 13.4

Unsatisfactory 13.9

Same 13,7

Satisfactory 13.4

Same 13.4

Compiled by V.Malkov Editor L.Pchelinska Tehred O.Vashchishina Korrektor1L.Patay

Order 581/15 Circulation 757 Subscription

VNIIPI USSR State Committee

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

Branch PPP Patent, Uzhgorod, Proektna St., 4

Continuation of table 2

20.2 19.3 19.3 20.0 19.5 19.3 19.3

Claims (1)

MIXTURE FOR MANUFACTURE OF HEAT-INSULATING PLATES, mainly used for warming t of the head part of the ingot, including granulated blast furnace head, paper waste, refractory clay, graphite, sulphite-alcohol distillery, characterized in that, in order to increase the heat resistance and erosion resistance of the plates, the mixture contains a decree · the ingredients in the following ratio, wt.%: Granulated blast furnace 45.5: -60.0 Paper waste production 8-15 Fire-clay 15-30 Graphite 0.5-2.0 Sulphite-alcohol vaya barda 9-15