SU1719338A1 - Process for binder production - Google Patents

Abstract

The invention relates to the building materials industry and can be used in the preparation of concrete and concretes based on it. The aim of the invention is to increase flexural strength and reduce water permeability. The method of preparing a binder involves preparing an aqueous suspension of a zeolite gel by dissolving sodium aluminate in a solution of sodium hydroxide in a ratio of 4: (1-3) on a solid, mixing with a solution of sodium metasilicate with a density of 1.2-1.3 g / cm3 at Si: AI 2 ratio, incubation for 12-14 hours, evaporation at 60-80 ° C for 1-3 hours, then introduction of the prepared suspension of the gel of composition N320-Al203-2SI02 (2-4,5) Н20 into a mixture of co-ground lime, ash or ash-and-slag waste from TPPs and nepheline syenite and mixing alkaline lignosulfonate and alkali carbonate with a ratio of components, May. %: lime (CaO + MgO act) 9.89-20.3; nepheline syenite 4.95; - 9.47; alkaline carbonate 2 - 10; alkaline lignosulfonate (dry) 0.1 - 1.89; the specified gel 3,95 - 10.42; TPP waste else. Compressive strength 15.7–26.9 MPa, with bending 4.02– 5.93 MPa, contract 0.024– 0.048 cm3 / g, water permeability 1.8-2.2 MPa, 3 tab.

Description

The invention relates to the building materials industry and can be used in the preparation of concrete and mortars and concretes based on it.

The purpose of the invention is to increase the flexural strength and decrease the water permeability.

. Example. The improvement of the physicomechanical characteristics of the suspect in the proposed method consists in changing the nature of the neoplasms. The data of differential thermal and X-ray phase analyzes indicate the formation of a significant amount of gel alkaline electrolytic silicates, which

it recrystallizes over time into zeolitic minerals similar to drive analcimes. The cation-exchange process that occurs in the system with the introduction of carbonate salts provides a less intense interaction of the system components with the formation of poorly soluble calcium carbonate on the surface of lime particles, but at the same time promotes the formation of caustic alkali activating ash and slag aluminosilicates. The additionally introduced synthesized gel of hydronefelin composition contributes to the process of improving the structure as the most

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prepared and distributed by weight phase. The presence of well-crystallized nepheline syenite as a seed intensifies the crystallization processes. In addition, the excess of alkali present in the synthesized aluminosilicate gel plays the role of an activator of the aluminosilicate component of the fuel ash; It also contributes to the process of transition of the gel into stable zeolite structures, which is accompanied by insignificant counter-processes. A significant amount of gel formations with small homogeneous pores in a hardening artificial stone, regardless of the duration of its hardening, determines such properties as relatively high bending strength and low contraction, which determines the permeability of the stone, its weather resistance and, as a result, durability.

As a lime-containing component, building lime with an active content (CaO + MgO) of at least 70% is used.

The chemical composition of the used fuel ash and ash-slag mixtures, as well as nepheline syenite is given in table 1.

The alkali metal carbonates are aqueous solutions of sodium and potassium carbonates or with an alkaline melt with a density of 1.18 - 1.19 g / cm3.

Sodium and potassium salts of ligosulfonic acid (alkaline lignosulfonate, ASTM labeling) are used as lignosulfonate additives.

As the aqueous suspension of the gel, use is made of a suspension of the gel of the composition Na2O A1203 25U2 ZN20, obtained as follows: dissolving sodium aluminate in a solution of sodium hydroxide in a ratio of 4: 2 (solid); mixing the obtained solution with a solution of sodium metasilicate with a density of 1.25 g / cm3, ensuring the ratio Si: keeping the obtained gel at a normal temperature for 12-14 hours; evaporation at 60 - 80 ° C for 1 - 3 hours until the minimum true density of the solid phase is 1.62

-1.8 g / cm-5.

The slurry process consists of co-milling lime, ash component and addition of nepheline syenite to a specific surface area of 300 m / kg. An aqueous suspension of the gel is introduced into the obtained powder, after which the mixture is closed with an aqueous solution of sodium or potassium carbonate with a density of 1.19

0 5 0

five

0

five

0 5

0

five

about

g / cm or alkaline melt with a density of 1.18 g / cm together with the addition of lignosulphonate. Perhaps the introduction of the gel and simultaneously with the mixing of the specified aqueous solutions.

In accordance with the requirements of GOST 310.4-81 and GOST 2544-76, the strength of the binding is determined in beam samples of 40x40x160 mm in size from a 1: 3 solution (by weight).

The samples are subjected to heat and humidity treatment according to the mode 2 + 4 + 8 + 2 h at a temperature of 95 ± 5 ° С,

Samples of natural hardening were kept in conditions of normal humidity for 28. days.

Contraction determination was carried out according to the method of Yu.S.Malinin by hydrostatic weighing of samples in kerosene.

The test results are given in table 2 (in the numerator are given (the characteristics of the steamed samples, in the denominator - the natural hardening within 28 days).

The results of the physicomechanical tests of the analogous test that was made with the separation of the taken additives of nepheline syenite and the aqueous suspension of the gel are shown in Table 3.

Claims (1)

Invention Formula The method of obtaining a binder, including grinding of lime, ash or ash-and-slag waste of thermal power plants and additives, followed by mixing the mixture with a solution of alkaline lignosulfonate and alkaline carbonate, characterized in that. To increase bending strength and reduce water permeability, an aqueous suspension of zeolite gel is prepared by dissolving sodium aluminate in a sodium hydroxide solution in a ratio of 4: 1-3 (solid), then mixed with sodium metasilicate solution of density 1 , 2-1.3 g / cm at a ratio of SI: AI 2, incubated for 12-14 hours, evaporated at 60-80 ° C for 1-3 hours, the prepared suspension of composition Ma20-A120z-25U2 (2-4 , 5 Н20Ввод solid mixture before mixing, in this case, nepheline syenite and as a living substance are used as an additive contains these components in the following ratio, wt.%: Lime (on CaO + MdOact) 9.89 - 30.3 Nepheline syenite4,95-9,47 Alkaline carbonate (dry) 2 - MOT Alkaline lignosulfonate (dry) 0.1-1.89 The specified gel3,95-10,42 Ash or slag waste TPP T a b l Tripolsky gold slake HES79.11 Lime9.89 Potassium carbonates 2.00 Water suspension gel 3.95 Nepheline syenite 1.95 Alkaline lignosulfonat0, 10 Tripoli ash and slag HES58.33 Lime9.89 Alkaline water 10,00. Aqueous gel suspension 10.1 (2 Nepheline syenite 3.7 Alkaline lignosulfonate 1, 89 Zola Ladyzhinsky TPP 69,22 Lime19.78 Sodium carbonate 2.00 Water suspension gel 3.95 Nepheline syenite 95 Alkaline lignosulfonat0, 10 Tripoli ash and slag TES1 8, M Lime. 19.78 Potassium Carbonate .10.00 Aqueous Suspension 10 Gel Nepheline syenite 9.7 Alkaline lignosulfonat1, 89 Zola Ladyzhinskaya TPP 58,7.0 Lime30.30 Alkaline melt 2.00 Water suspension gel 3.95 Nepheline syenite (, 95 Alkaline lignosulfonat0, 10 Tripoli ash and slag TES37.92 Lime30.30 Potassium carbonate 10.00 f 3,010.05 Ґ7v2 GR W , 12О, (FROM Ґ78T M55 , k5 р; 0 And А, 76 оТШ , 720,036 Tjt ozt H, 99 0.032 5.93 TTolT 5.30,028 MG OTOTI Water suspension gel 10, Nepheline syenite9,47 Alkaline lignosulfonate 1.89 Ash of Nazarovskaya TPP 79.11 -Live9.89 Sodium carbonate 2.00 Aqueous Suspension Gel 3.95 Nepheline syenite4,95 Alkaline lignosul-. background t Ash of the Nazarov TPP Lime Potassium Carbonate 0.10 58.3 9.89 10.0 Aqueous Suspension Gel 1Q, 42 Nepheline Syenite 9.7 Alkaline lignosulphonate Ash of the Nazarov TPP 1.89 69.22 19.78 2.00 Lime Alkaline water melt gel suspension 3.95 Nepheline syenite 4.95 Alkaline lignosulfonat0, 10 Ash of Nazarovskaya TPP Lime Potassium carbonate 48.44 19.78 10.00 one Aqueous Suspension Gel 10, Nepheline Syenite 9.47 Alkaline lignosulfonat1, 89 Zo Oshlak Nazarovskaya TES58,70 For30.30 Alkaline melt 2.00 Aqueous suspension of gel 3.95 Nepheline syenite 4.95 Alkaline lignosulfonat0, 10 Ash of Nazarovskaya TES37.92 Lime30.30 Sodium carbonate 10.00 Aqueous gel suspension 10,42 Nepheline syenite 9.4 : E ::::: EL ::: IL ::::: I Continued table. 2 6 T5ti 4,150,042 Ґ77В 0.040 iS 4, $ 0 0.037 37GG T5703T and 13 .1 WT 3.39 0.0451.8 4.07 776 4,050,0411,6 Ґ75T TOJ53T7 (G t 2.890.0511.6 HRT .0, 348T78 i T &% CSTTST2 Continued table. Note. The content of quicklime is given in revision of the active CaO + MgO. The content of alkali carbonates is given in terms of solid matter - alkaline carbonate. The content of the aqueous suspension of the gel is given in terms of solid. - The content of alkaline lignosulonates - in terms of solid. Above the line, the characteristics are given in the suspect, subjected to TVO 95 + 5 ° C, below the line - solidified under natural conditions for 28 days. Since the content of alkaline carbonate in the composition in the prior adopted for the prototype is given in terms of, here, for comparison with the proposed, the content of alkaline carbonates in in terms of solids.