SU692684A1 - Heat-insulating composition for heating top discards - Google Patents

Description

(clay, shale) or the evils of thermal power plants. The volumetric weight of it is in the range of 150-800 kg / m. For the manufacture of heat-insulating mixtures, expanded clay gravel is used with a bulk weight of 150-300 kg / m and a grain size of up to 5.0 mm. . tel. At the same time, the entry of more than 35.0% of expanded clay into the mixture, due to the fact that its temperature is 1; :.

Waste paper or refined paper pulp (a product made from wood sulphate pulp) is used in mixtures to enhance the physicomechanical and thermal properties and

reduce the melting of the walls of the shells in contact with the mixture of liquid metal. These products are added to the mixture in the form of pulp. When these products are introduced into the mixture in an amount of less than 0.5%, their effect on the properties of the mixture is insignificant. This is because the MajHiie pulp amounts are unevenly distributed in the mixture. When the content of these products is greater than 10.0%, the gas permeability of the mixture is significantly reduced, the drying cycle of the shells is extended, and cracking is often observed during drying. Enter in the mixture of about 5-10.0%. paper or refined paper pulp waste: to reduce the bulk weight of the mixture, to improve its heat insulation properties and to significantly reduce

opla lbN11Ya walls of shells of large sizes (diameter greater than 250 mm).

The introduction of crushed coke waste into the mixture results in a decrease in the degree of shell melting. The optimal amount of coke injected is in the range of 6.5–9.5%. When the coke waste content is less than 6.5%, the walls of the shells are substantially melted. When using coke wastes of a 9.5% coke, a decrease in the strength of the shells in a dry state is observed, which is due to the partial burnout of coke wastes when drying products.

Shu Gizit is a product of swelling .. at 1100-1240s, crushed shale shungite rocks containing 1.2-5.0% of shungite substance, which is a special form of gLerode in the form of particles

0.02 microns evenly distributed among a silicate mass consisting of particles about 10 microns in size, and able to swell at the indicated temperatures. The volumetric weight of shungizite is 280laOO kg / m. Porosity 60-74%. For smiles, this is used schungizite with a removable weight of 280-400 kg / m3. The limits for the co-holding of schungisite in a mixture are determined depending on its effect on the physicomechanical and thermophysical properties and the degree of fusion of the mixture in contact with the liquid metal. When the content of schungisite 5 is less than 15.0%, the strength decreases and the melting of heat insulation shells increases, and when using a mixture with a content of schungisite more than 25.0%, they are significantly removed. its thermal insulation properties.

Refractory clay and liquid glass within the specified limits ensure that the optimum strength properties are obtained in a raw and dry state.

in tab. 1 shows the compositions of the mixtures according to the present invention.

In tab. 2 shows the physicomechanical and thermophysical properties of the studied mixtures, the degree of shell melting and the average yield value when using shells of various mixtures for heating the profits of steel castings weighing 63.821,50 kg.

Compared to the prototype mixture, the mixture of the proposed composition allows reducing the volume weight from 450-640 to 325-365 kg / m3; increase gas permeability - from 350-520 to 450-650; increase the compressive strength of gray samples from 0.58-0.70 to 0.700, 80 kgf / cm2; increase the tensile strength in the dry state from 4.65, 6 to 5.7-6.8 kgf / cm; to reduce. with a heat capacity of 0.737-0.758 to 0.7320, 737 kJ / (); reduce the thermal conductivity from 0.134–0.226 to 0.1220, 128 W / (m ° C), and reduce the heat-accumulation coefficient from 206.8324, 0 to 172.8-186.5 W.sec VM c. In the manufacture of castings, it was established that the mixture of the proposed composition, as compared with the prototype mixture, reduces the degree of fusion of the shell walls from 49-73% to 3249% and increases the yield of suitable steel casting from 60-65 to 68-73%.

The economic efficiency of using the proposed mixture is 3.9-8.1 rubles. on 1 ton of suitable steel carbon casting.

Table 1

Shungizit15,0

Expanded clay gravel15,0

out

Waste paper or finished paper-. on the pulp -10,0

Crushed waste Volume of dry mix, kg / m 365 Gas permeability, units 450-500 475-530 Compressive strength in wet condition, kgf / cm2 0.78-0.84 0.75-0.80 Strength in dry condition states, kgf / cm 6,2-6,8 6,0-6,4

Heat capacity, kJ / (kg-С)

0.735

Thermal conductivity, BT / (M.t)

Heat-accumulation coefficient, BT.ceKVM -t The degree of melting of the walls of the walls of the pan, 32-41 37-48 leaves,% yield, pouring,% 72-79 69-76-, 5

Claims (2)

Invention Formula Thermal insulation, mixture for insulating the profits of castings, mainly 15, 0 17,520,022,525.0 35.0 22,530,015,035,0 2.0 7.5 5.0 6.0 - -. 345 350 355 360 325 0.733 0.730 0.737 0.734 0.732 0,124 0,126 0,124 0,126 0,123 177.6 180.1 174.5 185.3 172.8 carbon and alloyed steels, including shungizite, refractory clay and liquid glass, characterized in that, from 465-520 to 480-580 to 485-565 to 580-650 0.74-0.77 0.71-0.75 0 , 72-0.76 0.70-0.74 6.0-6.5 6.2-6.6 6.0-6.3 5.9-6.2 38-49 36.47 35-43 38-49 68-75,5 70-77,5 71-78 68-75 (i  ;: ". in order to increase its physicomechanical and thermal insulation properties, reduce the degree of mixture melting when in contact with liquid steel and increase the output of the casting, it additionally contains kerameite gravel, paper waste or refined paper pulp and crushed coke waste with the following ratio of ingredients, wt.% : Shungieit 15.0-25.0 Expanded clay gravel 15.0-35.0 Paper waste or refined paper pulp 0.5-10.0 € 9.6843 crushed waste of coke 6.5-9.5 refractory clay 5.0-20.0 liquid glass Else, Sources of information taken into account during the examination, Sat. Improvement of technology .j float and obtaining castings from non-ferrous alloys, M., GSH: INTI, 1963, 1-63-38 / 5 s, 7., 2. USSR author's certificate 501828, cl. In 22.D 7/10, 1974.