RU2811162C1 - Composite binding material - Google Patents

Abstract

FIELD: binding materials.

SUBSTANCE: composite binder material includes Portland cement clinker and a sulphate component, and vanadium production waste with cullet is introduced as a sulphate component at a ratio of 2:1 parts by weight, respectively, in an amount of 9-12 wt.%, dispersion 6500 cm²/g.

EFFECT: increased quality indicators of the binder material while reducing the energy intensity of its production.

1 cl, 6 tbl, 2 ex

Description

The invention relates to the production of binding materials that can be used in the production of building materials.

Cementing materials are known, including various industrial wastes, the disadvantages of which are the relatively low quality of the final product and the high energy intensity of their production.

The closest in technical essence is the binding material - cement (RF Patent No. 2119897), including Portland cement clinker and a sulfate component consisting of gypsum stone and anhydrite at a ratio, wt. %: gypsum stone 30 - 70, anhydrite 30 - 70, in addition, the sulfate component contains as anhydrite a waste product from the production of aluminum fluoride - acid fluoride, and the total content of the sulfate component in cement is 1 - 4 wt. % in terms of SO ₃ .

The disadvantage of the proposed binder material is the relatively low quality of the final product with the high energy intensity of its production.

The technical result of the proposed invention is to increase the quality indicators of the binder material while reducing the energy intensity of its production.

The technical result is achieved by the fact that the composite binder material includes Portland cement clinker and a sulfate component, and vanadium production waste with cullet is introduced as a sulfate component at a ratio of 2:1 parts by weight, respectively, in an amount of 9-12 wt. % dispersion 6500 cm ² / g.

The proposed composite binder material differs from the prototype in that vanadium production waste with cullet is introduced as a sulfate component at a ratio of 2:1 parts by weight, respectively, in an amount of 9-12 wt. % dispersion 6500 cm ² / g.

The optimal ratios of the components of binder materials, obtained experimentally, are presented in Table 1.

Table 1 Component ratio
(vanadium production waste: cullet Vanadium production waste and cullet,
wt. % Portland cement clinker, % Compressive strength, MPa 1:1 6.0
9.0
12.0
15.0 94.0
91.0
88.0
85.0 39.4
42.8
46.2
41.8 2:1* 6.0
9.0*
12.0*
15.0 94.0
91.0*
88.0*
85.0 54.7
59.1*
57.8*
51.7 3:1 6.0
9.0
12.0
15.0 94.0
91.0
88.0
85.0 36.9
41.7
43.9
38.4

^{* - optimal option}

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

table 2
Time for grinding binder components to a specific surface area of 6500 cm ² /g. Mill name Grinding time, hour Ball porcelain mill with urolite balls 4.0 Centrifugal planetary mill 0.25

Together with Portland cement clinker, vanadium production waste, the main phase of which is gypsum, and glass cullet are additionally ground to a specific surface of 6500 cm ² /g to obtain particles with a size of 3.4-3.6 microns. During this joint grinding, mechanical activation of vanadium production waste particles and glass cullet particles with Portland cement clinker particles occurs, 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. The use of a centrifugal planetary mill allows reducing energy costs by 3 times and reducing grinding time by more than 10 times. Combined use of vanadium production waste and cullet at a ratio of 2:1 parts by weight in an amount of 9-12 wt. % leads to a significant increase in strength due to the synergistic effect and the formation of columnar and needle-shaped sodium-containing crystals of gmelenite and thomsonite.

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 3).

Table 3
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 4 (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 4
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 average chemical composition of broken window and container glass is presented in Table 5 (RF Patent No. 2778880 “Alkaline glass binder”)

Table 5

Example 1:

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. Portland cement 91.0 wt. was loaded into a centrifugal planetary mill. %, vanadium production waste and broken glass at a ratio of 2:1 parts by mass in an amount of 9.0 mass. % and the mixture was ground to a specific surface area of 6500 cm ² /g. The particle sizes of vanadium production waste, cullet and Portland cement clinker were 3.4-3.6 microns. The grinding time was 15 minutes.

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 85°C, 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 vanadium production waste, cullet and Portland cement influenced the strength characteristics of the final product and specific surface area (Table 6).

Table 6
Effect of grinding time on specific surface area and particle size No. Grinding time, min Specific surface area, cm ² /g Particle size, microns 7 5800 More than 10 10 6200 5.0-7.0 15* 6500* 3.4-3.6* 20 6550 3.3-3-4

^{*- optimal parameters}

As can be seen from Table 6, 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 quality of the binder material to less than the M400 grade of binder material.

The dispersity of crushed particles of the original Portland cement clinker, vanadium production waste and cullet after 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. Compressive strength was determined as the average strength of five samples, which was 59.1

Example 2:

According to example 1, a mixture of Portland cement clinker was prepared in an amount of 88.0 wt. %, vanadium production waste and cullet at a ratio of 2:1 parts by weight, respectively, in an amount of 12 wt. %. Samples were formed and tested for strength according to example 1.

The compressive strength of the cubes was 57.8 MPa, which corresponds to the grade of binder material M 500.

When the mixture of vanadium production waste and cullet increases by more than 12%, the quality of the binder material is below grade M 400.

Thus, the optimal content of vanadium production waste and cullet at a ratio of 2:1 mass parts in the binder material lies in the range of 9.0-12.0%.

Claims (1)

A composite binder material comprising Portland cement clinker and a sulfate component, characterized in that vanadium production waste with cullet is introduced as a sulfate component at a ratio of 2:1 parts by weight, respectively, in an amount of 9-12 wt. %, dispersion 6500 cm ² /g.