RU2815130C1 - Method of producing binding material - Google Patents

Abstract

FIELD: chemistry.

SUBSTANCE: invention relates to methods of producing binders and can be used in production of construction materials and construction. Method of producing binding material involves mixing and combined grinding of portland cement and industrial sulphate-containing wastes, wherein said industrial waste is a mixture of vanadium production wastes and sanitary engineering ceramics with a ratio of components of 2:1 with the following ratio of binder components, wt.%: portland cement — 84.0–86.0, said industrial wastes — 14.0–16.0, and combined grinding is carried out to specific surface of 6,400 cm²/g with addition of superplasticizer "Melflux 1641" in excess of 100% — 0.16%.

EFFECT: obtaining a binder with improved strength properties while reducing energy consumption during production thereof.

1 cl, 7 tbl

Description

The invention relates to methods for producing binders and can be used in the production of building materials.

There are a number of known methods for producing binders, including averaging and joint grinding of the main component with various industrial wastes, the disadvantage of which is the low strength properties of the binder.

The closest to the proposed method is the method for producing cement [RF Patent No. 2497767], which includes mixing and co-grinding Portland cement clinker with gypsum and an active mineral aluminum-silicon-containing additive; technogenic heat-treated aluminum-silicon-containing waste from the processing of mineral raw materials in the form of fly ash from thermal power plants from coal combustion, heat-treated at 950-1050°C and/or in the form of waste heap ash - burnt rock from mine dumps of coal deposits, heat-treated at 600-850°C, which is fed for mixing in an amount of 5-25% by weight clinker

The disadvantage of the analogue is the low strength properties of the binder.

The technical result of the proposed invention is to obtain a binder with increased strength properties.

The technical result is achieved by the fact that the method for producing a binder material includes mixing and co-grinding of Portland cement and industrial sulfate-containing waste, wherein said industrial waste is a mixture of vanadium production waste and sanitary construction ceramics with a component ratio of 2:1 with the following ratio of binder components, wt. %:

- Portland cement 84.0-86.0

- specified industrial waste 14.0-16.0,

and joint grinding is carried out to a specific surface area of 6400 cm ² /g with the addition of superplasticizer “Melflux 1641” in excess of 100% - 0.16%.

The proposed method differs from the prototype in that industrial sulfate-containing waste is a mixture of vanadium production waste and sanitary construction ceramics with a component ratio of 2:1 with the following ratio of binder components, wt.%:

- Portland cement 84.0-86.0

- specified industrial waste 14.0-16.0,

and joint grinding is carried out to a specific surface area of 6400 cm ² /g with the addition of superplasticizer “Melflux 1641” in excess of 100% - 0.16%.

A comparative analysis of the known and proposed methods is presented in Table 1.

Table 1

Known method -
RF Patent No. 2497767
"Method of producing cement" Suggested method Mixing and co-grinding of Portland cement clinker with gypsum with the addition of an additive in the form of technogenic heat-treated aluminum-silicon-containing waste from the processing of mineral raw materials in the form of thermal power plant fly ash from coal combustion, heat-treated at 950-1050 ° C and/or in the form of waste heap ash - burnt mine rock dumps of coal deposits, heat-treated at 600-850°C, which are fed for mixing in an amount of 5-25% of the clinker weight. Mixing and grinding Portland cement and industrial waste; a mixture consisting of vanadium production waste and sanitary construction ceramics is introduced as a sulfate component at a component ratio of 2:1, respectively, in an amount of 14.0-16.0 wt. % and dispersion 6400 cm ² / g with the addition of superplasticizer "Melflux 1641" over 100% - 0.16% Compressive Strength(MPa)
45.24 Compressive Strength(MPa)
61.6-63.1

The experimentally obtained parameters of grinding and mechanical activation of the mixture are presented in Table 2.

table 2

Grinding time to specific surface area of 6400 cm ² /g binder components

Mill name Grinding time, hour Ball porcelain mill with urolite balls 4.0 Centrifugal planetary mill 0.25

The optimal ratios of binder components obtained experimentally are presented in Table 3.

Table 3

Astringent, wt. % Waste from vanadium production / waste from sanitary-building ceramics (mass parts) Component content, wt. % Compressive strength, MPa 88 1:2 12 49.4 86 14 52.2 84 16 53.2 82 18 50.5 88 2:1* 12 57.9 86 14* 61.6* 84 16* 63.1* 82 18 59.2 88 1:1 12 48.3 86 14 50.9 84 16 52.1 82 18 48.7 * – optimal option

In the process of joint grinding, the components are ground down and the particles of the mixture are mechanically activated, consisting of vanadium production waste and sanitary-building ceramics waste, which leads to the occurrence of solid-phase reactions due to an increase in the surface and internal energy of all particles and a shift of the limiting stage from the diffusion region to the kinetic one, which accelerates the process of amorphization of crystalline phases, and when mixed with water, it increases the number of hydrate phases by 10-15% and improves the quality of the final product.

The starting material was Portland cement clinker produced by Srebryakovcement OJSC, grade CEM II/A 42.5N (GOST 31108-2016) with a specific surface area of 3200 cm ² /g of the following chemical composition (Table 4).

Table 4

Chemical composition of Portland cement

CaO _{SiO2 Al2O3 ​ Fe2O3 ​} MgO SO _{3 R2O} p.p.p. 62.44 21.29 5.72 3.37 2.09 2.83 1.21 1.10

The chemical composition of vanadium production waste is presented in Table 5, which is published in the following article: Bessmertny V.S., Zdorenko N.M., Cherkasov A.V., Varfolomeeva S.V., Bondarenko M.A., Makarov A.V. ., Platov Yu.T., Platova R.A. Possibility of using vanadium production waste in the technology of wall ceramics // Glass and Ceramics. 2022. T. 95, no. 7. pp. 43 – 50).

Table 5

Chemical composition of vanadium production waste

p.p.p./ other Mass content, % _{SiO2 Al2O3 ​} CaO MgO _{V2O5 Mn2O3 ​} SO ₃ 1.13/0.06 3.22 0.41 36.93 5.03 2.81 17.39 33.02

The chemical composition of waste from the production of sanitary-building ceramics is presented in Table 6, which is published in the following article: Bessmertny V.S., Minko N.I., Dyumina P.S., Sokolova O.N., Bakhmutskaya O.N., Simachev A.V. Production of facing bricks by plasma treatment using raw materials from technogenic deposits // Glass and Ceramics, 2008, No. 1. pp. 17-19).

Table 6

Chemical composition of waste from the production of sanitary ceramics

p.p.p./ other Mass content, % _{SiO2 Al2O3 ​ Fe2O3 ​} FeO CaO MgO K ₂ O _Na2O SO ₃ 6.92 65.15 25.98 0.3 - 0.53 0.36 1.05 0.6 footprints

Superplasticizer "Melflux 1641" is a free-flowing modified polycarboxylate ester spray dried powder (BASF CONSTRUCTION POLYMER, September, 2009).

Example:

Portland cement in an amount of 84%, vanadium production waste and sanitary ceramics production waste were loaded into a centrifugal planetary mill in a ratio of 2:1 parts by weight in an amount of 16%, and the mixture was additionally ground to a specific surface area of 6400 cm ² /g. The particle sizes of vanadium production waste and Portland cement clinker were 3.4-3.6 microns. The grinding time was 15 minutes.

The operating parameters of the Sand centrifugal planetary mill were as follows: drum rotation speed 325s ^-1 ; The material of the mill and balls is chalcedony.

The mixture was extracted and samples were molded into cubes 30x30x30 mm with a water-cement ratio (W/C) of 0.23. After hardening in air for 24 hours, the cubes were removed from the mold and subjected to heat and humidity treatment in a LOIP steaming chamber for 6 hours at a temperature of 85ºC, and then the samples were hardened in air for 28 days.

The superplasticizer “Melflux 1641” was used as a plasticizing additive, which was added to the mixture in excess of 100% - 0.16%.

The particle size of waste from vanadium production, waste from the production of sanitary ceramics and Portland cement influenced the strength characteristics of the final product and specific surface area (Table 7).

As can be seen from Table 7, the optimal grinding time was 15 minutes. When the grinding time increased to 20 minutes, the specific surface area increased slightly, and the energy consumption for grinding increased by 25%. With a grinding time of 10 minutes, the specific surface area, compared to the optimal parameters, decreased to 6200 mm ² /g, and the average particle size was in the range of 5.0-7.0 microns, which significantly reduced the grade of the binder material to less than the grade of binder material M400.

Table 7

Effect of grinding time on specific surface area and particle size

No. Grinding time, min Specific surface area, cm ² /g Particle size, microns 1. 7 5800 More than 10 2. 10 6200 5.0-7.0 3. 15* 6400* 3.5-3.6* 4. 20 6450 3.4

* ^{- optimal parameters}

The dispersity of crushed particles of the original Portland cement clinker, waste from vanadium production, waste from the production of sanitary ceramics and the mixture after additional grinding was determined using an ANALYSETTE 22 Nano Tecplus laser particle size analyzer. The compressive strength of the cubes was carried out on a hydraulic press PMG-100 MG4. The compressive strength of the samples was 61.6-63.1 MPa, which corresponds to the grade of binder material M 500.

Claims (4)

A method for producing a binder material, including mixing and co-grinding of Portland cement and industrial sulfate-containing waste, characterized in that said industrial waste is a mixture of vanadium production waste and sanitary construction ceramics in a component ratio of 2:1 with the following ratio of binder components, wt.%: - Portland cement 84.0-86.0; - specified industrial waste 14.0-16.0, and joint grinding is carried out to a specific surface area of 6400 cm ² /g with the addition of superplasticizer “Melflux 1641” in excess of 100% - 0.16%.