SU1634650A1 - Raw mix for production of agloporite - Google Patents

Abstract

The invention relates to the production of building materials and can be used for the manufacture of agloporite3. To increase the vertical sintering rate, increasing the frost resistance and durability of agglomerate in sodium sulphate solution, the raw mix includes, by weight:% slag GRES 65-70; return 18-19 and quartz sand 12-16. The resulting agloporite in fractions of 5–20 mm is characterized by a bulk density of 510–570 kg / m, strength of 0.7–0.92 MPa, frost resistance of 1.24–1.25%, and resistance in sodium sulfate solution of 1.41–1.437, The vertical sintering rate of the dicht is L, 9-7.1 mm / min, i. abl „

Description

The invention relates to mixtures for the manufacture of artificial porous filler for light concrete - agloporite and can be used in the building materials industry.

The purpose of the invention is to increase the vertical speed of sintering, increase the frost resistance and durability of agloporite in sodium sulphate solution.

The raw material mixture for the manufacture of agloporite includes, May / L: SDPP 65-70; return 18-19 and quartz sand 12-160

For the preparation of the mixture, slag from the Maysk Hydroelectric Station of the Khabarovsk Territory, quartz sand from the Loevskoye deposit, as well as return was used. The slag is coarse

the material of the following chemical composition, wt.%: Si02 41.65; A1Z0, I7.J5; 2.24; Ti02 0.64; CaO 2.50; MgO 2.00; S03 0.15; Na20 0.73; CgO 1.75, p0Po By 30099a Heat of slag combustion 1700 - 1800 kkat / kg,

Quartz sand has the following chemical composition, Si02 98.86; A1g03 0.04; Stifle; GeO3 0.17; CaO 0.39; MgO 0.18; SOj pet; ppt 0,36; R20 is not.

Its grain composition is characterized by the presence of particles, wt.%: More than 0.25 mm in size, 2.52; 0.25 - 0.1 mm 89.64; less than 0.01 mm J.92; 0.01-0.005 mm 0.62; 0.005 - 0.001 mm 0.03; less than 0.001 mm 3.00,

Bottom return is characterized by the following grain composition, wt.%: Particles larger than 10 mm 5.7; 7-10 mm If-;

About CO 4 O5 SL

5 - 7 mm 25; 3 - 5 mm 24; 1-3 mm 21; less than 1 mm 90

Example. The preparation and sintering of the charge was carried out as follows: Components, charge (slag-GRES, return and quartz sand) were metered to a common collecting conveyor (mass dosage), which fed them to the two-chamber clay mixer, where they were mixed and moistened to a moisture content of 25 - 26% g Granulation of the charge was carried out in a drum granulator sintering at the sintering station. The ignition temperature of the mixture was 1060–10700 ° C; vacuum in the chambers 180–190 mm of water and DHE, temperature of the exhaust gases 130-170 ° CU

In the sintering process, the ignition temperature of the charge, the temperature of the flue gases were controlled, and the vacuum under the grate was regulated. After the process was completed, the vertical sintering rate was determined and the quality parameters showed aglo porite: frost resistance and durability in sodium sulfate solution according to GOST 9758-86

The test results and the properties of the resulting agloporite are presented in the table.

Agglo-porite is obtained from the raw mix with frost resistance by weight loss of 1.24-1.25% and resistance in sodium sulfate solution by weight loss of 1.41-1.43%. At the same time, the vertical sintering rate of the agglomerate is 6.9- 7.1 mm / min

An increase in the vertical sintering rate when using the mixture can be explained as follows:

A mineral-petrographic study of agloporite allowed us to establish that the majority of micropores are usually concentrated in areas of quartz grain accumulations. 0 At the same time, a microscopic study of thin sections of raw materials, in particular sand represented by quartz, showed that quartz grains overflowed with gas inclusions. mi ,,

During heat treatment at a certain temperature range, as a result of an increase in pressure inside the gas-liquid inclusions, they explode. Obviously, during the period of the grain break, the volatile species are released under a huge volume.

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This, on the one hand, contributes to the porisation of the melt, on the other hand, to the breaking of the pyroplastic layer of the charge in all directions,

As a result of adiabatic expansion of gas-liquid inclusions in both cases, the melt temperature decreases, the viscosity rises, the melt structure in the explosion region is fixed to the air flowing to the newly formed open pores contributes to the combustion of the fuel in the underlying layers and cools this area. The gas-dynamic mode of sintering is improved.

Thus, an increase in the vertical sintering rate should be attributed to an improvement in the gas-dynamic sintering regime of

In addition, the improvement of the gas-dynamic regime contributes to a more complete flow of all physicochemical processes in the layer of sintered charge: more complete melting of the charge, burning out of coal and organic substances from it, better contact sintering of the pellets. Therefore, there are no nest of burns in the sintered layer, where poorly baked grains mainly accumulate. As a result, frost resistance of agloporite is improved (weight loss during alternate freezing and thawing is reduced) and its stability in the solution of sulfur sodium chloride (weight loss also decreases after three test cycles)

The resistance of agloporite in sodium sulphate solution is largely determined by the presence of weak grains of underburning in these grains. These grains are not sufficiently baked, have low strength.

Rehydrated clay reacts with cement alkalis0. Gel-like reaction products bulge 3oiry of contact, resulting in the adhesion between the aggregate and cement stone in the concrete, cracks occur, its strength decreases.

Increasing the resistance of agloporite in a solution of sodium sulfate allows to increase the strength of concrete

The mixture can be used in the agglomeration of slags from a number of other power plants containing fuel. For example, slags from the Primorsk, Barabinsk, South Ural, Urgal, Chulman, Raichikhinsk, Omsk, Petroplavlovsk, Nizhne-Turinsk GRES contain fuel in an amount from 17.0 to 36.0.

Claims (1)

Invention Formula Raw mix for the manufacture of agloporite, including slag power plant, cart-15 4650 ten 15 gate and silica-containing component, characterized in that, in order to increase the vertical sintering speed, increase the frost resistance and durability of agloporite in sodium sulfate solution, it contains silica sand as a silica-containing component in the following ratio of mixture. Slag GRES65-70 Return 18-19 Quartz sand12-16 Type and content of components in mixture, maso%: Slag GRES656770 Return 1918,5 18 Quartz sand 16 4,5 12 Vertical sintering speed the charge, mm / min 7,0 7,16,96,4 Characteristics of the resulting agloporite Bulk density, kg / m: fr "5-10 mm550 570560495fr" 10-20 mm515 510520600 Strength, MPa: fr ". 5-10mm0.90 0.92 0.920.65-fr0 10-20 mm0.70 0.77 0.750.80 Frost resistance for weight loss,% If24 1,252,89 Resistance in sulphate solution sodium by weight loss,% 1.41 1,, 19 Note ( Indicators of frost resistance and resistance in sodium sulphate solution are given by average values,