Composition for manufacturing light concrete, method of preparing composition for light concrete manufacturing and method of light concrete manufacturing (versions)

FIELD: chemistry.

SUBSTANCE: group of inventions relates to the production of construction materials, namely to a composition for light concrete manufacturing, a method of preparing the composition for light concrete manufacturing and methods of manufacturing light constructive-heat-insulating concrete products. The composition for light concrete manufacturing contains, wt %: Portland cement 45-50, GRES ash microspheres 30-40, reinforcing filler 0.5-11.0, water - the remaining part, with the GRES ash microspheres and reinforcing filler being activated to a cement clinker. The method of preparing the composition for manufacturing light concrete includes the introduction of the reinforcing filler into Portland cement in the form of inorganic disoriented fibres and mixing until a homogeneous mixture is obtained, introduction of the GRES ash microspheres, the surface of which is preliminarily activated to the cement clinker, and the obtained mixture is tempered with water or water with a plasticising additive C3. The method includes the activation of the surface of the GRES ash microspheres by the application of a finishing agent or chemical processing. The method of light concrete manufacturing, obtained by mixing Portland cement, GRES ash microspheres and water consists in the following: the GRES ash microspheres, the surface of which is preliminarily activated to the Portland cement clinker, are preliminarily introduced into Portland cement, the mixture is tempered with water, with the application of the preliminarily activated to Portland cement clinker reinforcing filler in the form of oriented fibres in the formation of light cement, introduction of the oriented fibres is realised layer-by-layer in the process of moulding, which is carried out by layer-by-layer vibrocompacting with the further mixture exposure at 100% humidity. The invention is developed in independent and dependent claims of the invention formula.

EFFECT: obtaining constructive-heat-insulating and constructive-fire-resistant light concrete with an increased strength and with reduced moisture-absorption.

9 cl, 7 ex, 3 tbl

 

The invention relates to the production of building materials, namely, compositions and methods of manufacturing light structural insulating and structural concrete products.

A composition for producing the composite material used for production of facing tiles, roofing materials, etc. based on cement binder, reinforcing synthetic fibers, micro filler, a plasticizer, and water (Patent RF №2165399, publ. 20.04.2001, IPC SW 40/00). A method for preparing a composite material includes mixing the components, the mixture taken in the ratio 100 wt.h. cement 20-100 wt.h., at least one micro filler, from 0.05 to 0.5 wt.h. a plasticizer, 30-50 wt.h. water and 0.5-5 wt.h. synthetic fibers. Before mixing the filler or mixture of fillers and plasticizers or a mixture of filler(s) and the reinforcing fibers are subjected to mechanochemical activation in highly stressed devices. From composite mixture formed products, which had a bending strength σfrom=6,5-37.8 MPa, modulus of elasticity E=3,2-40,0 HPa, water absorption is 3.5 - 4.5%.

The disadvantage of this method is that the activation of the components prior to forming the composite material is carried out in highly stressed devices with acceleration acting bodies 80-60 m/s 2that leads not only to activate but also to the grinding of the mixture components. While fillers such as vermiculite and fly ash, lose internal pore structure that does not allow to obtain a composite material with low density. The minimum density of the resulting products are: with vermiculite as 1.59 to 1.68 g/cm3with fly ash of 1.65-1.70 g/cm3.

Known composition for the manufacture of foam products containing, wt.%: cement 36-43, microspheres 4-11, dispersed chalk 7-9, air-entraining additive 0,06-0,08, water - the rest (RF Patent No. 2186749, publ. 10.08.2002, IPC SW 38/10). A method of manufacturing foam products includes fill in the form and curing the foam mix, prepared by mixing of cement, fly ash aggregate, and pre-prepared foam from an aqueous solution of air-entraining additives. The foam is prepared by whipping an aqueous solution of air-entraining additives with air in the ratio from 1:9 to 1:11, respectively, and the resulting foam consistently, with continuous stirring injected dispersed chalk with a specific surface area of 700-1200 cm2/g, ash filler, which is used as microspheres - the most light fraction of fly ash of thermal power plants density 0.3-0.5 g/cm3and then the cement.

The disadvantage of receiving�nogo lightweight concrete is the use of air-entraining additives leads to the formation of well-developed open-pored structure of the material and, as a consequence, the resulting foam has a low strength and high water absorption - use of this material for the external works require protection from the weather.

The closest to the claimed technical essence and the achieved result, selected as a prototype, is a lightweight concrete that is described in the patent of Russian Federation №2289557, publ. 20.12.2006, IPC SW 38/08, including cement, hollow microspheres, siliceous opal-cristobalite breed - the flask and water in the following ratio of components, wt.%: cement 24,9-29,3, flask 11,8-20,2, microspheres 29,8-35,1, water - the rest. A method of manufacturing lightweight concrete is in the preliminary mixing of the components in the dry state (cement, silica clay, microspheres) in appropriate proportions, the mixing of dry mix for 1 min. Then to the mixture was added with the mixing water and carried out their joint stirring for 2 min. Then made the molding and vibroplate mixture in the form of the weights (22 g/cm2) for 1.5 min, followed by exposure of the mixture before thermal processing within 4 h. Lightweight concrete obtained by this method has a compressive strength σSG=19,5-27,0 MPa at a density ρ=0,965-1.11 g/cm3.

Lack�atcom of lightweight concrete are the low Flexural strength, that is determined by the absence of a reinforcing filler, and high water absorption of the resulting material for use as filler opal-cristobalite rocks with porosity up to 50%, which leads to the formation of an open-pored structure of the concrete.

It should be noted that the strength characteristics in the prototype is achieved including through the use of high grade cement - M 500 according to GOST 10178.

The objective of the claimed invention is to increase the Flexural strength and reduced water absorption of lightweight concrete based on cement binder, while maintaining its density and compressive strength.

The technical result of the claimed invention is to obtain a structural heat-insulating and fire resistant structural material with the following characteristics:

- high strength:

- the bending strength σfromto 18.0 MPa,

- the compressive strength σSGto 22.8 MPa;

- density - ρ=0.87 to 1.03 g/cm3;

- thermal conductivity λ=0,23-0,27 W/(m·K);

- water absorption - 2-3%;

- high fire resistance due to the use of inorganic initial component

- use as a binder cement low grades (M300).

For solving the mentioned problem and achieve the technical result of the proposed composition for the manufacture of easy�of concrete, containing Portland cement, fly ash microspheres GRES, water, which according to the invention additionally contains a reinforcing filler, in the following ratio of components, wt.%:

Portland cement - 45-50

ash microspheres GRES - 30-40

the reinforcing filler is 0.5-11,0

water - the rest,

while ash microspheres GRES and the reinforcing filler is activated to the cement clinker.

We have also proposed a method for preparing a composition for the manufacture of lightweight concrete, which consists in mixing Portland cement, fly ash microspheres GRES, water, which according to the invention in the pre-Portland cement reinforcing filler is injected in the form of inorganic unidirectional glass fibers and stirred to obtain a homogeneous mixture, then injected ash microspheres GRES, the surface of which is pre-trigger to the cement clinker, and the resulting mixture was shut water or water with a plasticizer additive C3.

Activation of the surface of ash microspheres TPP can be realized by applying sprays or chemical treatment.

A method of manufacturing lightweight concrete obtained by mixing Portland cement, fly ash microspheres GRES, water, which according to the invention in the pre-Portland cement injected microspheres, the surface of which is pre-activated K p�relanzamiento clinker, mix shut water, and in the formation of lightweight concrete using pre-activated by Portland cement clinker reinforcing filler in the form of oriented fibers, while the introduction of oriented fibers is performed layer by layer in the formation process, which is carried out by layer-by-layer vibration compaction, followed by aging the mixture at 100% humidity.

Activation of the surface of ash microspheres GRES and a reinforcing filler can be carried out by applying sprays or chemical treatment.

The second variant of the method of manufacturing lightweight concrete obtained by mixing Portland cement, fly ash microspheres GRES, water, which according to the invention in the pre-Portland cement reinforcing filler is injected in the form of inorganic unidirectional glass fibers and stirred to obtain a homogeneous mixture, then injected ash microspheres GRES, the surface of which is pre-trigger to the cement clinker, and the resulting mixture was shut water, and in the formation of lightweight concrete using pre-activated by Portland cement clinker reinforcing filler in the form of oriented fibers.

The introduction of a reinforcing inorganic filler in the original composition containing Portland cement, fly ash microspheres GRES and water, such as: beggar-thy - �sterowanie fibers or oriented fibers, or simultaneously disoriented and oriented fibers and adjusting the ratio of components allows to increase the compressive strength and Flexural strength, which is important when using concrete as a structural material. To improve the strength characteristics contributes to a process for the production of concrete, namely activation of the surface components of reinforcing material and ash microspheres GRES allows you to ensure the interaction of all components of the mixture and to increase the compressive strength and Flexural strength. It is important that the obtained low density and thermal conductivity of concrete. The use of closed-easy filler, microspheres, activation of the surface of fillers ensure its interaction with the clinker, and the use of low water-cement ratio minimizes content of pores in the concrete structure and get it with low water absorption.

Use for concrete only inorganic source components provides a fire resistant material that is not only resistant to fire but does not emit toxic or non-breathing gaseous products.

For the manufacture of lightweight concrete were used the following source materials:

- Portland cement of grade M-300 GOST 10178-85;

- ash microspheres Cherepetskaya GRES (size - 40-160 μm, truths�nd the density of 0.65-0.70 g/cm 3);

- unidirectional glass fiber - glass fiber reinforced plastic, MS-STV, basalt fiber, basalt fiber with a diameter of 5-30 μm and the aspect ratio of >10;

oriented fiber - glass grid SSCO and THE SCQ 6-78-00204961-29-98 and non-galvanized welded wire mesh THE 14-4-647-95 from low carbon cold drawn wire with a diameter of 1.4 mm with a cell of 10×10 mm and a size of 38×158 mm;

- plasticizer C3 TU 5870-002-58042865-03.

The composition for the manufacture of lightweight concrete and the characteristics of the lightweight concrete are presented in tables 1-3.

Example 1. Fabrication of samples with unidirectional glass fibers.

The lightweight concrete samples were produced as follows.

Unidirectional glass fibers were introduced into the cement by mixing the fibers with the cement in pistil mill for 5 minutes. Was then added to the microspheres, and components (with fiber cement and microspheres) was mixed in a mixer, first dry for 3 minutes and then after mixing with water plasticizing additive C3 for 5 minutes. The formation of the samples was carried out on the vibrating table in the form of 40×40×160 mm with weights, creating a pressure of 25 g/cm2. Vibroplate material (height 40 mm) was carried out in layers - 8 mm, the compaction of each layer is 30 s. After fabrication, the samples were aged for 1 day in molds at 100% humidity, then forms� disassembled and the samples were placed in water for 27 days.

The composition of the resulting lightweight concrete are presented in table 1.

The bend test was conducted in accordance with GOST 4648-71 (ST SEV 892-78) on specimens 40×40×160 mm, lying freely on two supports, short-term loading in the middle between the supports. The distance between the supports was l0=100 mm. we determined the limit of the bending strength σfromand the amount of deflection εzwith the destruction of the sample. The measurement results are shown in table 1.

Compression testing was conducted on specimens 40×40×62 mm in accordance with GOST 4651-82 (ST SEV 2896-81). When tests were determined: breaking stress in compression (σwith) and relative deformation in compression (εwith). The measurement results are shown in table 1. For comparison, table 1 shows the characteristics of the sample (No. 1) made from microspheres and cement. As a result of the introduction of reinforcing filler in the form of unidirectional glass fibres, the compressive strength increased 1.8 times, and the bending - 0.7 MPa.

Example 2. Fabrication of samples with unidirectional glass fibers and the activated surface of the microspheres.

Sample preparation was carried out analogously to example 1. The difference from example 1 in that the surface of the microspheres are pre-activated in some samples on the microspheres used in the sprays are silica; in others, wire�was chemical activation of the surface of the microspheres treatment called 1 HCl; thirdly, the surface of the microspheres were activated by boiling. The formulation and test results of the bending and compression are shown in table 2. By activating the surface of the microspheres the compressive strength of lightweight concrete samples increased 1.5 times compared to the samples made in example 1. Water absorption of lightweight concrete was 2.7%, and thermal conductivity is 0.23 W/(m·K).

Example 3. Fabrication of samples with oriented fibers.

The lightweight concrete samples were produced as follows.

Components: cement and microspheres were mixed in a mixer, first dry for 3 minutes and then after mixing with water within 5 minutes. The formation of the samples was carried out analogously to example 1.

The introduction of oriented fibers (5 layers glass grid SSCO CCMS) was performed in layers at the time of formation samples. The compositions and the characteristics of the lightweight concrete are presented in table 3.

With the introduction of oriented fibers relative deformation on the bending of light concrete increased more than 2 times compared to the samples made in example 1.

Example 4. Fabrication of samples with oriented fibers with a finished surface.

Sample preparation was carried out analogously to example 3. The difference from example 3 in that, as designed�ƈ fibers used metal mesh 3 layers. To improve the adhesion of a metal grid with cement clinker at the surface of the metal deposited oxide / phosphate coating which has good adhesion with the base metal, and forming the oxides of iron and phosphorus present in the composition of Portland cement, provide high adhesion of the treated concrete to the rebar. As a result of the use of reinforcing metal mesh compression strength is almost not increased, but the bending strength increased more than 4 times, the density increased by only 18%. Water absorption of lightweight concrete was 2.1%, and the conductivity of 0.27 W/(m·K).

Example 5. Fabrication of samples with oriented fibers, the surface of which is activated by chemical treatment.

Sample preparation was carried out analogously to example 4. The difference from example 4 in that, to ensure adhesion of a metal grid with Portland cement clinker activation of the metal surface was carried out by chemical treatment with 1 n Hcl. Applied microspheres, activated according to example 2. As a result of acid treatment of the reinforcing metal mesh and activate the microspheres provide a good grip and metal microspheres with concrete, and Flexural strength amounted σfrom=17.3 MPa. Water absorption of lightweight concrete was 2.4% and the conductivity - 027 W/(m·K).

Example 6. Fabrication of samples with oriented and unidirectional glass fibers with a finished surface.

Sample preparation was carried out analogously to example 4. The difference from example 4 in that the surface of the unidirectional glass fibers pre-activated by boiling for 5 minutes.

Surface activation unidirectional glass fibres by boiling and the application of oxide-phosphate coating on the surface of the metal mesh increased the bending strength and compression lightweight concrete samples compared to the samples made in example 4, the density has not changed. Water absorption of lightweight concrete was 2.0%, and thermal conductivity is 0.25 W/(m·K).

Example 7. Fabrication of samples with unidirectional glass and oriented fibers with a finished surface and microspheres with an activated surface.

Sample preparation was carried out analogously to example 6. The difference from example 6 in that the surface of the microspheres are pre-activated by boiling for 10 minutes.

Activating the surface of the microspheres and unidirectional glass fibres by boiling and the application of oxide-phosphate coating on the surface of the metal mesh increased the bending strength and compression lightweight concrete samples compared to the samples made�bubbled in example 4 the density has not changed. Water absorption of lightweight concrete was 1.5%, and the conductivity of 0.28 W/(m·K).

The composition and the characteristics of the lightweight concrete are presented in table 3.

The introduction of reinforcing filler can significantly improve the strength characteristics of lightweight concrete. Thus, the use of unidirectional glass fibers increases the compressive strength of 1.8 times, oriented fibers leads to an increase in the relative deformation during the bending tests of lightweight concrete is more than 2 times, and the use of reinforcing metal mesh allows to increase the bending strength of more than 4 times while maintaining the compressive strength. When using filler (microsphere and fiber) in order to ensure the adhesive interaction of the filler with a binder, the compressive strength of lightweight concrete samples increased in 1,5 times.

Density,
g/cm3
Table 1
No.Portland cement, %Ash microspheres GRES, %Filler (fiber), %Water, %Plasticizer C3 %BendingCompression
σfrom, MPaεz, %σBP, (MPa)ε30, %
147,2(3)Of 31.5-21,3-0,913,41,28,22,71
247,2(4)Of 31.5-21,3-0,913,31,19,32,5
345,9(3)30,62,8(1)20,40,30,893,21,013,53,00
446,4(3)31,01,9(1)20,40,3Of 0.874,11,214,04,0
546,4(3)31,01,9(2)20,40,30,894,11,214,71,3
1 - FRP, MS-PTS
2 - basalt fiber
3 - Portland cement grade 300
4 - Portland cement grade 500

Table 2
No.Portland cement, %Ash microspheres
GRES
Filler (fiber),%Water,%Density,
g/cm3
BendingCompression
σfrom, MPaεz, %σBP, (MPa)ε30, %
%processing.
147,531,6silica1,919,00,894,80,58Of 21.26,2
247,531,61N HCl1,919,00,884,90,4617,75,4
346,6Is 31.11N HCl3,718,60,914,50,5118,32,8/td>
447,531,6boiling1,919,00,864,70,7222,75,4
546,6Is 31.1boiling3,718,60,885,00,6121,74,8

Table 3
No.Portland cement, %Ash microspheres
GRES, %
Filler, %Water, %Density,
g/cm3
BendingCompression
σfrom, MPaεz, % σBP, (MPa)ε30, %
fibermesh
146,230,8-2,3SKOA 20.70,904,82,914,41,3
246,130,7-2,3SSK20,90,914,72,212,51,7
3Of 41.827,91,811,0metal.17,51,0318,03,022,84,7
442,47,4 1,811,0metal.Of 17.41,05The 17.32,8A 21.44,5
542,4To 27.41,811,0metal.Of 17.41,0518,92,923,54,6

1. The composition for the manufacture of lightweight concrete containing Portland cement, fly ash microspheres GRES, water, characterized in that it further comprises a reinforcing filler in the following ratio of components, wt.%:

Portland45-50
ash microspheres GRES30-40
reinforcing filler0,5-11,0
waterthe rest,

while ash microspheres GRES and the reinforcing filler is activated to �Amantea clinker.

2. The composition for the manufacture of lightweight concrete according to claim 1, characterized in that the reinforcing inorganic filler used unidirectional glass fiber.

3. The method of preparing the composition for the manufacture of lightweight concrete, which consists in mixing Portland cement, fly ash microspheres GRES, water, characterized in that the pre-Portland cement reinforcing filler is injected in the form of inorganic unidirectional glass fibers and stirred to obtain a homogeneous mixture, then injected ash microspheres GRES, the surface of which is pre-trigger to the cement clinker, and the resulting mixture was shut water or water with a plasticizer additive C3.

4. A method according to claim 3, characterized in that the activation of the surface of ash microspheres GRES is performed by applying sprays.

5. A method according to claim 3, characterized in that the activation of the surface of ash microspheres GRES carry out chemical treatment.

6. A method of manufacturing lightweight concrete obtained by mixing Portland cement, fly ash microspheres GRES, water, characterized in that the pre-Portland cement injected microspheres, the surface of which is pre-activated to Portland cement clinker, a mixture shut water, and in the formation of lightweight concrete using pre-activated to portlandite�Tomo clinker reinforcing filler in the form of oriented fibers, thus the introduction of oriented fibers is performed layer by layer in the formation process, which is carried out by layer-by-layer vibration compaction, followed by aging the mixture at 100% humidity.

7. A method according to claim 6, characterized in that the activation of the surface of ash microspheres GRES and a reinforcing filler is carried out by applying sprays.

8. A method according to claim 6, characterized in that the activation of the surface of ash microspheres GRES and a reinforcing filler is carried out by chemical processing.

9. A method of manufacturing lightweight concrete obtained by mixing Portland cement, fly ash microspheres GRES, water, characterized in that the pre-Portland cement reinforcing filler is injected in the form of inorganic unidirectional glass fibers and stirred to obtain a homogeneous mixture, then injected ash microspheres GRES, the surface of which is pre-trigger to the cement clinker, and the resulting mixture was shut water, and in the formation of lightweight concrete using pre-activated by Portland cement clinker reinforcing filler in the form of oriented fibers.



 

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1 tbl

FIELD: construction.

SUBSTANCE: in the method to prepare a haydite concrete mix, including preparation and mixing of mixture components, mixing of the haydite concrete mix is carried out in a turbulent concrete mixer with rotor rotation frequency of at least 8 sec-1 and not more than 30 sec-1, at first 30% of required tempering water is supplied into the turbulent concrete mixer, and gradually haydite gravel is loaded with the running turbulent mixer, and mixed for 120 sec., then the required balance of water is supplied to the continuously running turbulent concrete mixer with addition of technical modified lignosulphonates and a gas forming additive PAK-3, then fly ash and cement are loaded, and the mix is mixed for 2-3 min. to produce homogeneous mix with required cone slump, at the following ratio of components, wt %: portland cement 20.00, haydite 41.50, superplasticiser LSTM 0.0312, fly ash of TPP 17.50, PAK-3 0.025, water - balance.

EFFECT: reduced process operations in production of haydite mix, increased frost resistance, heat insulation properties and reduced average density of haydite without strength reduction.

2 tbl

Concrete mixture // 2543822

FIELD: chemistry.

SUBSTANCE: concrete mixture contains, wt %: portland cement 22.0-24.0; haydite with grain size of 20-40 mm 22.0-27.5; haydite sand 6.0-8.0; grade 6 asbestos 1.0-2.0; rock flour from limestone or marble 20.0-24.0; water 18.0-20.0.

EFFECT: high water-resistance.

1 tbl

FIELD: chemistry.

SUBSTANCE: group of inventions relates to dry concrete or mortar composition, containing porous granules and to concrete or mortar, manufactured from said composition. Dry concrete or mortar composition, containing particles-cores, to the surfaces of which particle of hydraulic binding substance are fixed, and separate particles of hydraulic binding substance, particles-cores consist of inert or pozzolanic material and together with binding substance attached to them form porous granules, which, in their turn, are fixed to the surface of dry filling agent. Concrete or mortar, manufactured from said dry composition, mixed with water, is described. Invention is developed in dependent items of the invention formula.

EFFECT: increase of strength and fire resistance of concrete, obtained from claimed dry composition.

25 cl, 2 ex

FIELD: construction.

SUBSTANCE: raw mix for manufacturing of heat insulation foam concrete contains, wt %: portland cement or slag portland cement 24.0-26.0, swollen perlite sand 40.4-44.65, air entering extraction-colophony resin 0.13-0.17, carboxymethylcellulose 0.13-0.17, superplasticiser S-3 1.0-1.2, silica gel 0.05-0.1, water 30.0-32.0.

EFFECT: reduced cement consumption without loss of foam concrete strength.

1 tbl

FIELD: construction.

SUBSTANCE: charge for production of a porous filler contains, wt %: montmorillonite clay ground to powder condition 85.0-90.0, glauconite ground to powder condition 10.0-15.0.

EFFECT: increased strength of a porous filler produced from charge.

1 tbl

Concrete mixture // 2537741

FIELD: chemistry.

SUBSTANCE: concrete mixture contains, wt %: portland cement 24.0-26.0, expanded clay with particle size of 20-40 mm 10.0-15.0, haydite sand 41.4-47.1, superplasticiser S-3 1.0-1.5, sodium ethyl siliconate or sodium methyl siliconate 1.0-1.5, lavsan fibre cut into 10-20 mm pieces 0.1-0.15, water 15.0-17.0.

EFFECT: high strength of articles made from the concrete mixture.

1 tbl

Concrete mixture // 2537733

FIELD: chemistry.

SUBSTANCE: concrete mixture, which includes portland cement, expanded clay, haydite sand, water, further contains asbestos of 6-7 types, which is fluffed up in advance, gypsum binder, sodium methyl siliconate or sodium ethyl siliconate, with the following ratio of components, wt %: portland cement 26.0-30.0; expanded clay with particle size of 20-40 mm 46.0-48.0; haydite sand 5.0-8.5; asbestos of 6-7 types, which is fluffed up in advance, 0.5-1.0; gypsum binder 0.5-1.0; sodium methyl siliconate or sodium ethyl siliconate1.0-1.5; water 15.0-17.0.

EFFECT: high strength.

1 tbl

Concrete mixture // 2536535

FIELD: chemistry.

SUBSTANCE: concrete mixture contains, wt %: portland cement 18.87-21.34, expanded clay 41.13-41.56, superplasticiser LSTM 0.0312, thermal power plant fly ash 13.92-18.87, gas-forming additive PAK-3 0.022-0.025, iron-containing sludge - chemical production waste 0.10-0.50, water - the balance.

EFFECT: obtaining concrete with higher strength and low density.

3 tbl

FIELD: construction.

SUBSTANCE: method to produce encapsulated chippings consists in application of a polymer film onto surface of chippings grains, besides, chippings are chosen from products of crushing and granulometric classification of crystalline rocks of microgranular structure, grains of chippings have spherical or ellipsoidal shape and cellular microrelief of surface with cell size of 5-50 mcm and concentration of cells of at least 80% of the area of grain surface, mixing is carried out on the flat horizontal surface in the layer of chippings with thickness of 30-70 mm at ambient temperature for 3-7 min until complete coverage of grains with polymer film and subsequent thermal treatment in drying devices until agglomeration stops.

EFFECT: increased quality of encapsulated chippings due to its more complete dyeing and coverage, reduced consumption of encapsulating substances.

6 cl, 2 dwg, 2 tbl

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