AU2020103188A4 - Concrete Containing Coal-to-liquids Coarse Slag and Preparation Method thereof - Google Patents
Concrete Containing Coal-to-liquids Coarse Slag and Preparation Method thereof Download PDFInfo
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- AU2020103188A4 AU2020103188A4 AU2020103188A AU2020103188A AU2020103188A4 AU 2020103188 A4 AU2020103188 A4 AU 2020103188A4 AU 2020103188 A AU2020103188 A AU 2020103188A AU 2020103188 A AU2020103188 A AU 2020103188A AU 2020103188 A4 AU2020103188 A4 AU 2020103188A4
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- 239000002893 slag Substances 0.000 title claims abstract description 206
- 239000007788 liquid Substances 0.000 title claims abstract description 66
- 238000002360 preparation method Methods 0.000 title claims abstract description 55
- 239000004567 concrete Substances 0.000 title claims abstract description 47
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 102
- 239000010959 steel Substances 0.000 claims abstract description 102
- 239000000463 material Substances 0.000 claims abstract description 82
- 239000002994 raw material Substances 0.000 claims abstract description 59
- 239000010440 gypsum Substances 0.000 claims abstract description 36
- 229910052602 gypsum Inorganic materials 0.000 claims abstract description 36
- 239000004568 cement Substances 0.000 claims abstract description 25
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 25
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 9
- 239000002699 waste material Substances 0.000 claims abstract description 6
- 239000002245 particle Substances 0.000 claims description 87
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 73
- 239000004576 sand Substances 0.000 claims description 51
- 239000010419 fine particle Substances 0.000 claims description 43
- 239000011362 coarse particle Substances 0.000 claims description 39
- 239000000428 dust Substances 0.000 claims description 39
- 229910052742 iron Inorganic materials 0.000 claims description 37
- 230000000717 retained effect Effects 0.000 claims description 35
- 238000000227 grinding Methods 0.000 claims description 32
- 230000001186 cumulative effect Effects 0.000 claims description 27
- 239000000843 powder Substances 0.000 claims description 15
- 239000004575 stone Substances 0.000 claims description 14
- 238000010409 ironing Methods 0.000 claims description 13
- 239000000203 mixture Substances 0.000 claims description 11
- 238000011282 treatment Methods 0.000 claims description 10
- 238000000926 separation method Methods 0.000 claims description 9
- 238000001035 drying Methods 0.000 claims description 6
- 235000005979 Citrus limon Nutrition 0.000 claims description 2
- 244000248349 Citrus limon Species 0.000 claims description 2
- PASHVRUKOFIRIK-UHFFFAOYSA-L calcium sulfate dihydrate Chemical compound O.O.[Ca+2].[O-]S([O-])(=O)=O PASHVRUKOFIRIK-UHFFFAOYSA-L 0.000 claims description 2
- 239000000919 ceramic Substances 0.000 claims 1
- 238000011221 initial treatment Methods 0.000 claims 1
- 239000000725 suspension Substances 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 23
- 239000002910 solid waste Substances 0.000 abstract description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 47
- 239000012615 aggregate Substances 0.000 description 38
- 239000007789 gas Substances 0.000 description 13
- 239000003245 coal Substances 0.000 description 9
- 238000012360 testing method Methods 0.000 description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 7
- 229910052799 carbon Inorganic materials 0.000 description 7
- 238000002309 gasification Methods 0.000 description 7
- 238000007873 sieving Methods 0.000 description 6
- 239000003795 chemical substances by application Substances 0.000 description 5
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 4
- 238000002441 X-ray diffraction Methods 0.000 description 4
- 238000004458 analytical method Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000002156 mixing Methods 0.000 description 4
- 239000012071 phase Substances 0.000 description 4
- 239000000047 product Substances 0.000 description 4
- 229910052710 silicon Inorganic materials 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 239000004566 building material Substances 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- 239000002002 slurry Substances 0.000 description 3
- 238000013112 stability test Methods 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 2
- 239000000292 calcium oxide Substances 0.000 description 2
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 238000000265 homogenisation Methods 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 238000010850 salt effect Methods 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 235000012239 silicon dioxide Nutrition 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 238000003746 solid phase reaction Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- KMWBBMXGHHLDKL-UHFFFAOYSA-N [AlH3].[Si] Chemical class [AlH3].[Si] KMWBBMXGHHLDKL-UHFFFAOYSA-N 0.000 description 1
- 230000003213 activating effect Effects 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000011469 building brick Substances 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 239000000378 calcium silicate Substances 0.000 description 1
- 229910052918 calcium silicate Inorganic materials 0.000 description 1
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 229910001653 ettringite Inorganic materials 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000010169 landfilling Methods 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 239000000376 reactant Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000010671 solid-state reaction Methods 0.000 description 1
- 238000004611 spectroscopical analysis Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000002352 surface water Substances 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
- 238000004876 x-ray fluorescence Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/14—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B5/00—Treatment of metallurgical slag ; Artificial stone from molten metallurgical slag
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention relates to a concrete containing coal-to-liquids coarse slag and a
preparation method thereof. The concrete comprises the following raw materials in
parts by weight: 15-20 parts of cementitious material, 30-40 parts of fine aggregate, 40
50 parts of coarse aggregate, 3.75-9 parts of water and 0.015-0.4 parts of water reducing
agent; wherein the cementitious material comprises 3-30 parts of coal-to-liquids coarse
slag, 20-60 parts of slag, 10-40 parts of steel slag, 5-20 parts of gypsum and 2-15 parts
of cement in parts by weight. The raw material provided by the invention has reasonable
gradation and excellent mechanical properties, and effectively utilizes industrial solid
wastes such as coal-to-liquids coarse slag, slag, steel slag, gypsum, etc., which is low
in cost, economical and environmentally friendly. The invention also provides a
corresponding preparation method, which realizes no waste, no pollution and high
efficiency in the whole process.
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Description
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Concrete Containing Coal-to-liquids Coarse Slag and Preparation Method thereof
The invention relates to the resource utilization field of industrial solid waste and the
technical field of building materials, in particular to a method of concrete containing
coal-to-liquids coarse slag and a preparation method thereof.
China is rich in coal reserves, but scarce in oil reserves, far from meeting the demand for oil
in China's industrial development. The coal-to-liquids industry produces petrochemical products
with coal as raw material. Crude slag and fine slag are produced in the process of coal-to-liquids
production. The slag produced by Yulin City alone is expected to reach 103.19 million tons by
2020. At present, the coal-to-liquids coarse slag is mostly treated by stockpiling or landfilling,
which not only occupies a large area of land, but also easily pollutes surface water, groundwater
and soil, and the stockpiling of slag will also cause air pollution such as dust.
Taking the coal-to-liquids coarse slag used in the invention as an example, it comes from a
coal-to-liquids factory in Shanxi and is black in color. The test results show that the residual
carbon of the coal-to-liquids coarse slag is very low with the loss on ignition of about 0-3%. The
thermodynamic (TG-DTA) results show that there is little mass loss in the coal-to-liquids coarse
slag. The analysis results of XRD (X-ray diffraction analysis) show that the coal-to-liquids coarse
slag does not contain crystals and presents a good amorphous state. XRF (X-ray fluorescence
spectroscopy) analysis results show that this kind of coal-to-liquids coarse slag contains very rich
calcium oxide, silicon dioxide, alumina and a certain amount of iron oxide, wherein the content of
silicon dioxide is more than 47%, the content of alumina is more than 24%, adding up to more
than 72%, the content of calcium oxide is more than 15%, the content of iron oxide is about 5%,
and the total amount of the above various oxides is about 93%; and the coal-to-liquids coarse slag
is promising to be a high-quality building material, and can be used in the production of
cementitious materials, concrete, building bricks, wall materials and so on.
The patent document CN108817030A disclosed a method for activating treatment of a fine
coal gasification slag, which comprises the steps of mixing the fine coal gasification slag with
alkaline medium powder uniformly, and adding appropriate oxygen-containing atmosphere at a
lower external temperature (which is lower than the required temperature for solid state reaction)
to promote the rapid combustion of unburned materials in fine coal gasification slag. The rapidly
generated heat can raise the temperature of the reactants rapidly to the temperature suitable for the
solid phase reaction to finally realize the rapid conversion of silicon-aluminum compounds in the
fine slag into active phase. It is easy to separate and extract Al, Si, Fe and other chemical
components from active phase by chemical method. However, this method is only suitable for
treating the fine coal gasification slag with high residual carbon content, without involving the
treatment method of coal-to-liquids coarse slag containing almost no residual carbon, and has
complicated treatment process.
The patent document CN107986643A disclosed a method for preparing adsorbing material
by fine coal gasification slag, which comprises the steps: a. adding water to prepare the slurry of
fine coal gasification slag; b. preparing silicon-rich composite slurry and carbon-rich composite
slurry; c. preparing carbon-rich adsorbing material. However, this method is still only suitable for
the treatment of fine coal gasification slag with high residual carbon content, without involving
the treatment of coal-to-liquids coarse slag containing almost no residual carbon, and has
complicated treatment process and high cost.
Therefore, finding a simple, economical and reasonable method that can make full and
effective use of coal-to-liquids coarse slag while making comprehensive use of industrial solid
wastes such as slag, steel slag and gypsum is a technical problem that those skilled in this need to
solve urgently.
The purpose of the invention is to provide a method of concrete containing coal-to-liquids
coarse slag and a preparation method thereof. The preparation method has the advantages that it is
simple in process, economical and reasonable, and can make full and effective use of
coal-to-liquids coarse slag.
For this reason, the first part of the invention provides a method of concrete containing
coal-to-liquids coarse slag, which comprises the following raw materials in parts by weight: 15-20
parts of cementitious materials, 30-40 parts of fine aggregate, 40-50 parts of coarse aggregate,
3.75-9 parts of water and 0.015-0.4 parts of water reducing agent (based on the dry basis mass of
water reducing agent);
Wherein, the cementitious material comprises the following parts by weight: 3-30 parts of
coal-to-liquids coarse slag, 20-60 parts of slag, 10-40 parts of steel slag particles, 5-20 parts of
gypsum and 2-15 parts of cement.
Further, the particle size of the steel slag particle is less than 3mm.
Further, the preparation of the steel slag particle comprises the following steps: crushing the
raw material of steel slag after iron removal, and sieving the steel slag to obtain coarse particle I
and fine particle I, wherein the coarse particle I has a particle size of greater than 10mm, and the
fine particle I has a particle size of less than 10mm; continuing to crush the coarse particle I after
iron removal to form a closed cycle; separating the fine particle I with a powder separator to form
steel slag sand and fine particle II, wherein the steel slag sand has a particle size of 3-10mm, and
the fine particle II has a particle size of less than 3mm; the fine particle II is the steel slag particle
prepared.
Further, the gypsum is one or more of desulphurization gypsum, phosphogypsum,
fluorogypsum, lemon gypsum and waste mold gypsum.
Further, the cement is P. 0 42.5 cement, P.1 42.5 cement or P.11 42.5 cement.
Further, the fine aggregate comprises the following parts by weight: 10-50 parts of steel slag
sand, 10-50 parts of coal-to-liquids coarse slag and 20-40 parts of mechanism sand.
Further, the gradation proportion of the steel slag sand is, based on the cumulative retained
percentage, >5mm: 0%, >2.5mm: 15%-20%, >1.25mm: 37%-45%, >0.63mm: 52%-58%, >0.315mm: 70%-78%, >0.16mm: 85%-95%.
Further, the gradation proportion of coal-to-liquids coarse slag in the fine aggregate is, based
on the cumulative retained percentage, >5mm: 0%-4%, >2.5mm: 25%-35%, >1.25mm: 55%-65%,
>0.63mm: 70%-78%, >0.315mm: 82%-87%, >0.16mm: 88%-95%.
Further, the gradation proportion of the mechanism sand is, based on the cumulative retained
percentage, >5mm: 0%-8%, >2.5mm: 28%-35%, >1.25mm: 40%-48%, >0.63mm: 54%-62%,
>0.315mm: 68%-76%, >0.16mm: 88%-95%.
Further, the coarse aggregate comprises the following parts by weight: 10-30 parts of steel
slag and 70-90 parts of stone.
Further, the gradation proportion of the steel slag is, based on the cumulative retained
percentage, 20mm: %-10%, >16mm: 8%-15%, >10mm: 15%-30%, >5mm: 30%-88%, >2.5mm:
%-97%.
Further, the gradation proportion of the stone is, based on the cumulative retained percentage,
>25 mm: 0%, >20 mm: 1%- 7 %, >16 mm: 20%-27%, >10 mm: 89%-96%, >5 mm: 92%-98%,
>2.5 mm: 95%-100%.
The second part of the invention provides a preparation method of the concrete, which
comprises the following steps:
Weight the cementitious material, fine aggregate, coarse aggregate, water and water reducing
agent according to the specified parts by weight, and mix the above raw materials to obtain the
concrete.
The preparation of the cementitious material comprises the following steps:
Si: Crushing the raw material of steel slag after iron removal, and sieving the steel slag to
obtain coarse particle I and fine particle I, wherein the coarse particle I has a particle size of more
than 10mm, and the fine particle I have a particle size of less than10mm; continuing to crush the coarse particle I after iron removal to form a closed cycle; separating the fine particle I with a powder separator to obtain steel slag sand and fine particle II, wherein the steel slag sand has a particle size of 3-10mm, and the fine particle II has a particle size of less than 3mm; the fine particle II is the steel slag particle prepared.
S2: Weighing the cement, coal-to-liquids coarse slag, slag, gypsum and steel slag particles
prepared in Step S Iaccording to the specified parts by weight, mixing the coal-to-liquids coarse
slag, slag, gypsum with steel slag particles, and grinding them with a grinding device to obtain the
fine particle III, coarse particle II and coarse particle III. After air separation, the fine particle III
enters the dust collector, the coarse particle II falls back to the grinding disc of the grinding device
and are ground continuously, and the coarse particle III continues to be ground with the grinding
device after iron removal, thus forming a cycle until all the raw materials enter the dust collector
to complete the preparation of the initial cementitious materials;
S3: Mixing the initial product of the cementitious material with the cement obtained by step
S2 to obtain the cementitious material.
Wherein, the particle size of the fine particle III meets the following conditions: 0< particle
sizes130[tm; the particle size of the coarse particle II meets the following conditions:
130jm<particle size<3mm; the particle size of the coarse particle III meets the following
conditions: 3mm< particle size<5mm.
Further, in Step SI, the crushing adopts a roll crusher or a jaw crusher, preferably a roll
crusher, and the distance between the two rollers of the roll crusher is 9mm-12mm. The particle
size of the steel slag after crushing is smaller and more uniform than that by the jaw crusher.
Further, the preparation of the cementitious material also comprises the following step:
The pretreatment by removing iron from the slag, and/or by drying and dispersing the
gypsum, and/or by drying the coal-to-liquids coarse slag.
Further, in the preparation process of the cementitious material, the dust collector produces
hot and humid off-gas, which passes through the pipe into the grinding device and then into the
dust collector after air separation of the particles to form a cycle.
Further, the grinding device is a vertical mill.
In the specific embodiment, the internal negative pressure of the vertical mill was
(-2500)Pa-(-2800) Pa, the pressure of the grinding roller was 10MPa-12MPa, the speed of the
powder separator was 1050 rpm-1180 rpm, the temperature of the hot and humid off-gas entering
the vertical mill was 225°C-245°C, the inlet pressure of the dust collector was
(-2950)Pa-(-3150)Pa, the inlet temperature of the dust collector was 70°C-85°C, the outlet
pressure of the dust collector was (-3950)Pa-(-4250)Pa, and the outlet temperature of the dust
collector was 60°C-70°C, the inner pressure of the hot and humid off-gas circulation pipeline was
(-580)Pa-(-630)Pa, and the material layer was 8cm-15cm thick.
By using the above parameters, the output of the vertical mill were greatly increased by
accurately controlling the internal pressure and temperature of the vertical mill, as well as the
pressure and air volume of the dust collector. The designed output of the vertical mill was 45t/h
and the actual output was 50t/h-60t/h. The output of the production line has been greatly increased
and the energy consumption has been effectively reduced with the comprehensive power
consumption per ton <58kW-h/t and the gas consumption <23m/t.
Further, the preparation of the fine aggregate comprises the following steps:
Weigh the raw material according to the following parts by weight: 10-50 parts of steel slag
sand prepared in Step 1, 10-50 parts of coal-to-liquids coarse slag and 20-40 parts of mechanism
sand prepared; mix these raw materials uniformly to obtain the fine aggregate.
Compared with the prior art, the invention has the following advantages:
(1) The raw material gradation of the concrete provided in the invention is reasonable, and
the industrial solid wastes such as coal-to-liquids coarse slag, slag, steel slag and gypsum are
effectively utilized, while reducing the amount of cement and lowering the preparation cost of the
concrete. The coal-to-liquids coarse slag contains high content of Si and Al, the mineral phases
equivalent to ettringite, hydrated calcium silicate gel and zeolite-like phase that are beneficial to
the strength of concrete are produced based on the 4-coordination homogenization effect and the
complex salt effect of Si, and synergized with the components of other raw materials, so that the concrete has excellent mechanical properties.
(2) In fine aggregate, the use of two wastes, the coal-to-liquids coarse slag and steel slag
sand, greatly reduces the amount of mechanism sand; in addition, the adjustment of the gradation of coal-to-liquids coarse slag, steel slag sand and mechanism in the fine aggregate makes it closer to the close packing, thereby reducing the use of cementitious materials, saving the cost, and leading to the higher compressive strength of the concrete.
(3) In the preparation method of the invention, instead of directly using the steel slag raw material to prepare the cementitious material, the steel slag particles obtained by circulating the process of iron removal, crushing and sieving of the steel slag raw materials were used for the preparation of the cementitious material. The raw material of steel slag has the characteristics of high hardness and difficulty in grinding, because the steel slag contains metallic iron particles that are hard to grind. Some large-grained metallic iron was exposed in advance after the crushing of steel slag raw materials, and then the exposed iron was removed effectively through the iron removal, which reduces the cyclic load of the subsequent crushing and improves the grinding efficiency of the subsequent grinding.
(4) The steel slag sand produced in the process of preparing the steel slag particles is used in fine aggregate, which makes full use of the hard-to-use solid waste such as steel slag, and realizes no waste, no pollution and high efficiency in the whole process of preparation.
(5) In the preparation method of the invention, the use of circulating hot-blast air for air separation can not only effectively screen the initial products of the cementitious materials, but also mix the initial products of the cementitious materials uniformly, so that no addition mixing equipment is required in the powder silo, which is more economical; the use of hot-blast air improves the ability of powder separation, and leads to stable fineness and specific surface area of the initial cementitious materials with small error; the hot-blast air properly dried the moisture of the initial cementitious material, which reduces the probability of early hydration to cause hardening of the initial cementitious material.
By reading the detailed description of the preferred embodiments below, various other
advantages and benefits will become clear to the general technical staff in this field. The figures
are used only to indicate the purpose of the preferred embodiments instead of being considered to
be a limitation of the invention. Among the figures:
Figure 1 is a flow diagram of the process for preparing the initial cementitious materials.
Figure 2 is the results of XRD (X-ray diffraction analysis) analysis of coal-to-liquids coarse
slag.
Figure 3 is the analysis and test results of thermodynamics (TG-DTA) of coal-to-liquids
coarse slag.
The exemplary embodiments of this disclosure will be described in more details with
reference to the figures. Although the figures show the exemplary embodiments of this disclosure,
it should be understood that this disclosure can be implemented in various forms and should not
be limited by the embodiments described here. On the contrary, these embodiments are provided
in order to have a better understanding of this disclosure and to be able to fully convey the scope
of this disclosure fully to the technical personnel in the field. The raw material used in the
embodiment of the invention can be obtained by conventional commercial purchase.
EMBODIMENT 1
(1) Preparation of cementitious materials
(1.1) Preparation of steel slag particles and steel slag sand
The primary crushing and pre-iron removal of the raw material of steel slag: the raw
materials of converter steel slag were fed, the pre-iron removal was carried out by a
suspension-type de-ironing separator, the steel slag pretreated with pre-iron removal was put into
the roller press for primary crushing, and then into the vibrating screen for sieving to obtain coarse particle I and fine particle I, wherein the coarse particle I had a particle size of 15mm, and the fine particle I had a particle size of 10mm; the coarse particle I returned to the roller press to be crushed continuously after the iron removal by a drum-type de-ironing separator to form a closed cycle; the steel slag sand and fine particle II was prepared after separating the fine particle
I with a powder separator, wherein the steel slag sand had a particle size of 5mm, and the fine
particle II had a particle size of 2.8mm. The fine particle II was the steel slag particle.
(1.2) Pretreatment of slag, gypsum and coal-to-liquids coarse slag
The raw materials of slag were fed, and pre-iron removal was carried out with a drum-type
de-ironing separator; the lime gypsum was dried and dispersed; the coal-to-liquids coarse slag
was dried.
(1.3) Preparation of preliminary cementitious materials
The P.O 42.5 cement, the steel slag particles prepared in Step (1.1) and the slag, gypsum and
coal-to-liquids coarse slag obtained by treatment in Step (1.2) were weighed according to the
following parts by weight: 12 parts of cement, 24 parts of steel slag particles, 34 parts of slag, 10
parts of gypsum, 20 parts of coal-to-liquids coarse slag, wherein P.O 42.5 cement was used in step
(1.4), and other raw materials were conveyed to a vertical mill by a belt conveyor for mixed
grinding. In the vertical grinding system, the fine particle III (0 <particle size <1301m), coarse
particle II (130tm <particle size<3mm) and coarse particle III (3mm<particle size<5mm) were
obtained. After air separation, the fine particle III entered the dust collector, the coarse particle II
fell back to the grinding disc to be ground continuously, and the coarse particle III continued to be
ground by the grinding device after iron removal, thus forming a closed cycle until all the raw
materials entered the dust collector to complete the preparation of the preliminary cementitious
materials.
In this process, the hot and humid off-gas was produced after the dust was collected by a dust
collector, and returned to the vertical mill through the circulation pipe, thus forming the recovery
and reuse of hot and humid off-gas; by controlling the internal negative pressure of the vertical
mill at -2700Pa, roller pressure at 1OMPa, speed of powder separator at 1080 rpm, the temperature
of hot-blast air entering the vertical mill at 225°C, the inlet pressure of the dust collector at -3080
Pa, the inlet temperature of the dust collector at 75°C, the outlet pressure of the dust collector at
-4080Pa, the outlet temperature of the dust collector at 65°C, the internal pressure of the hot and
humid off-gas circulation pipeline at -595Pa, the thickness of the material layer at 10.5cm, the
particle size of the returned material at 3mm-5mm, the prepared cementitious material had a
specific surface area of 450m 2 /kg, a particle size range between 0 and 130tm, a residue of 1.8%
retained on sieve of 0.045mm, a residue of 0.5% retained on sieve of 0.080mm, and the iron
content of 1.0-2.0%.
(1.4) Preparation of cementitious materials
Mixed the preliminary cementitious materials prepared in Step (1.3) with the weighed P. 0.
42.5 cement uniformly to obtain the cementitious materials.
(2) Preparation of fine aggregate
Weighed the following raw materials according to the following parts in weight: 25 parts of
steel slag sand, 25 parts of coal-to-liquids coarse slag, 50 parts of mechanism sand, wherein the
steel slag sand was prepared in Step (1.1). Mixed all the raw materials evenly to get fine
aggregate.
Among them, the gradation proportion of steel slag sand was, according to the cumulative
retained percentage, 5mm: 0%, 2.5mm: 17.6%, 1.25mm: 41.6%, 0.63mm: 56.3%,
0.315mm: 76.5%, 20.16mm: 88.0%. The gradation proportion of coal-to-liquids coarse slag was,
according to the cumulative retained percentage, >5mm: 3.7%, 2.5mm: 32.1%, 1.25mm: 60.7%,
0.63mm: 77.0%, >0.315mm: 84.9%, 0.16mm: 93.8%. The gradation proportion of the
mechanism sand was, according to the cumulative retained percentage, 5mm: 5.5%, 2.5mm:
12.6%, 1.25mm: 22.3%, 0.63mm: 32.2%, 20.315mm: 69.1%, 0.16mm: 92.2%;
3. Preparation of coarse aggregate
Weighed the following raw materials according to the following parts in weight: 28 parts of
steel slag, 72 parts of stone, and mixed all the raw materials evenly to obtain the coarse aggregate.
Among them, the gradation proportion of steel slag was, according to the cumulative
retained percentage, >20 mm: 2.2%, 16 mm: 8.6%, 10 mm: 16.2%, ?5 mm: 77.4%, 2.5 mm:
95.4%. The gradation proportion of the stones in the coarse aggregate was, according to the
cumulative retained percentage, >25 mm: 0%, 20 mm: 5.1%, 16 mm: 25.0%, 10 mm: 94.2%,
mm: 99.4%, 2.5 mm: 99.9%.
(4) Preparation of concrete
Weighed the raw materials according to Table 1, in which the water reducing agent is based
on the dry basis mass, and then mixed all the raw materials evenly to obtain the concrete.
Table 1 Concrete Composition (amount of concrete material per cubic meter: kg/m 3
) Cementitious Water Coarse Fine Water reducing
material aggregate aggregate agent
380 150 1090 800 1.9
EMBODIMENT 2
1. Preparation of cementitious materials
(1.1) Preparation of steel slag particles and steel slag sand
The primary crushing and pre-iron removal of the raw material of steel slag: the raw
materials of electric furnace steel slag were fed, the pre-iron removal was carried out by a
suspension-type de-ironing separator, the steel slag pretreated with iron removal was put into the
roller press for primary crushing, and then into the vibrating screen for sieving to obtain coarse
particle I and fine particle I, wherein the coarse particle I had a particle size of 10mm, and the fine
particle I had a particle size of 5mm; the coarse particle I returned to the roller press to be crushed
continuously after the iron removal by a drum-type de-ironing separator to form a closed cycle;
the steel slag sand and fine particle II was prepared after separating the fine particle I with a
powder separator, wherein the steel slag sand had a particle size of 3mm, and the fine particle II
had a particle size of 2mm. The fine particle II was the steel slag particle.
(1.2) Pretreatment of slag, gypsum and coal-to-liquids coarse slag
The raw materials of slag were fed, and the pre-iron removal was carried out with a
drum-type de-ironing separator; the desulphurization gypsum was dried and dispersed; and the coal-to-liquids coarse slag was dried.
(1.3) Preparation of preliminary cementitious materials
The P.O 42.5 cement, the steel slag particles prepared in Step (1.2) and the slag, gypsum and
coal-to-liquids coarse slag obtained after treatment in Step (1.1) were weighed according to the
following parts by weight: 10 parts of cement, 23 parts of steel slag, 42 parts of slag, 10 parts of
gypsum and 15 parts of coal-to-liquids coarse slag. wherein, P.O 42.5 cement was used in Step
(1.4), and other raw materials were conveyed by a belt conveyor to a vertical mill for mixed
grinding to obtain the particle11(0<particle sizes130pm), coarse particle II (130pm <particle
size<3mm) and coarse particle III (3mm<particle size<5mm) in the vertical grinding system.
After air separation, the fine particle III entered the dust collector, the coarse particle II fell back
to the grinding disc to be ground continuously, and the coarse particle III continued to be ground
continuously by the grinding device after iron removal, thus forming a closed cycle until all the
raw materials entered the dust collector to complete the preparation of the preliminary
cementitious material.
In this process, the hot and humid off-gas was produced after the dust was collected by a dust
collector, and returned to the vertical mill through the circulation pipe, thus forming the recovery
and reuse of hot and humid off-gas; by controlling the internal negative pressure of vertical mill at
-260Pa, grinding roller pressure at 11MPa, the speed of powder separator at 1010rpm, the
temperature of hot-blast air entering the vertical mill at 225°C, the inlet pressure of dust collector
at -3020Pa, the inlet temperature of the dust collector at 70°C, the outlet pressure of the dust
collector at -4050 Pa, the outlet temperature of the dust collector at 65°C, the internal pressure of
the hot and humid off-gas circulation pipeline at -590Pa, the thickness of material layer at 10.5cm,
the particle size of the returned material at 3mm-5mm, the prepared cementitious material had a
specific surface area of 550m 2 /kg, a particle size range between 0 and 130pm, a residue of 1.5%
retained on sieve of 0.045mm, a residue of 0.3% retained on sieve of 0.045mm, and the iron
content of 1.0-2.0%.
(1.4) Preparation of cementitious materials
Mixed the cementitious materials prepared in Step (1.3) with the weighed P.O. 42.5 cement evenly to obtain the cementitious materials.
(2) Preparation of fine aggregate
Weighed all the raw materials according to the following parts by weight: 30 parts of steel
slag sand, 25 parts of coal-to-liquids coarse slag, 45 parts of mechanism sand, of which the steel
slag sand was prepared in Step (1.1), and then mixed all the raw materials evenly to obtain the
fine aggregate.
Among them, the gradation proportion of steel slag sand was, according to the cumulative
retained percentage, 5mm: 0%, 2.5mm: 17.6%, 1.25mm: 41.6%, 0.63mm: 56.3%,
0.315mm: 76.5%, 20.16mm: 88.0%. The gradation proportion of the coal-to-liquids coarse slag
was, according to the cumulative retained percentage, 5mm: 3.7%, 2.5mm: 32.1%, 1.25mm:
60.7%, 0.63mm: 77.0%, 0.315mm: 84.9%,0.16mm: 93.8% The gradation proportion of the
mechanism sand was, according to the cumulative retained percentage, 5mm: 5.5%, 2.5mm:
12.6%, 1.25mm: 22.3%, 0.63mm: 32.2%, 0.315mm: 69.1%, >0.16mm: 92.2%.
3. Preparation of coarse aggregate
Weighed all the raw materials according to the following parts by weight: 10 parts of steel
slag, 90 parts of stone, and then mixed all the raw materials evenly to obtain the coarse aggregate.
Among them, the gradation proportion of steel slag was, according to the cumulative
retained percentage, >20 mm: 2.2%, 16 mm: 8.6%, 10 mm: 16.2%, >5 mm: 77.4%, 2.5 mm:
95.4%. The gradation proportion of stone was, according to the cumulative retained percentage,
?25 mm: 0%, 20 mm: 5.1%, 16 mm: 25.0%, 10 mm: 94.2%, ?5 mm: 99.4%, 2.5 mm:
99.9%.
(4) Preparation of concrete
Weighed all the raw materials in accordance with Table 2, in which the water reducing agent
is based on the dry basis mass, and mixed all the raw materials evenly to obtain the concrete.
Table 2 Concrete Composition (amount of concrete material per cubic meter: kg/m3
) Cementitious Water Coarse Fine Water reducing
material aggregate aggregate agent
400 150 1090 800 1.92
EMBODIMENT 3
(1) Preparation of cementitious materials
(1.1) Preparation of steel slag particles and steel slag sand
The primary crushing and pre-iron removal of the raw material of steel slag: the raw
materials of electric furnace steel slag were fed, the pre-iron removal was carried out by a
suspension-type de-ironing separator, the steel slag pretreated with iron removal was put into the
roller press for primary crushing, and then into the vibrating screen for sieving to obtain coarse
particle I and fine particle I, wherein the coarse particle I had a particle size of10mm, and the fine
particle I had a particle size of 5mm; the coarse particle I returned to the roller press to be crushed
continuously after the iron removal by a drum-type de-ironing separator to form a closed cycle;
the steel slag sand and fine particle II was prepared after separating the fine particle I with a
powder separator, wherein the steel slag sand had a particle size of 3mm, and the fine particle II
had a particle size of 2mm. The fine particle II was the steel slag particle prepared.
(1.2) Pretreatment of slag, gypsum and coal-to-liquids coarse slag
The raw materials of slag were fed, and the pre-iron removal was carried out with a
drum-type de-ironing separator; the desulphurization gypsum was dried and dispersed; the
coal-to-liquids coarse slag was dried.
(1.3) Preparation of preliminary cementitious materials
The P.O 42.5 cement, the steel slag particles prepared in Step (1.1) and the slag, gypsum and
coal-to-liquids coarse slag obtained after treatment Step (1.2) were weighed according to the
following parts by weight: 10 parts of cement, 24 parts of steel slag, 37 parts of slag, 10 parts of
gypsum and 19 parts of coal-to-liquids coarse slag, wherein the P.O 42.5 cement was used in Step
(1.4), and other raw materials were conveyed by a belt conveyor to a vertical mill for mixed
grinding to obtain the particle 1 ((0 <particle sizes130pm), coarse particle II (130pm <particle
size<3mm) and coarse particle III (3mm<particle size 5mm) in the vertical grinding system.
After air separation, the fine particle III entered the dust collector, the coarse particle II fell back
to the grinding disc to be ground continuously, and the coarse particle III continued to be ground
continuously by the grinding device after iron removal, thus forming a closed cycle until all the
raw materials entered the dust collector to complete the preparation of the preliminary
cementitious material.
In this process, the hot and humid off-gas was produced after the dust was collected by a dust
collector, and returned to the vertical mill through the circulation pipe, thus forming the recovery
and reuse of hot and humid off-gas; by controlling the internal negative pressure of vertical mill at
-2650Pa, the grinding roller pressure at 1IMPa, the speed of powder separator at 1010rpm, the
temperature of hot-blast air entering the vertical mill at 225°C, the inlet pressure of dust collector
at -3020Pa, the inlet temperature of the dust collector at 70°C, the outlet pressure of dust collector
at -4050 Pa, the outlet temperature of dust collector at 65°C, the internal pressure of the hot and
humid off-gas circulation pipeline at -590Pa, the thickness of material layer at 10.5cm, the
particle size of the returned material at 3mm-5mm, the prepared cementitious material has a
specific surface area of 600m 2 /kg, a particle size range between 0 and 130pm, a residue of 1.3%
retained on sieve of 0.045mm, a residue of 0.1% retained on sieve of 0.080mm, and the iron
content of 1.0-2.0%.
(1.4) Preparation of cementitious materials
Mixed the cementitious materials prepared in Step (1.3) with the weighed P.O. 42.5 cement
evenly to obtain the cementitious materials.
(2) Preparation of fine aggregate
Weighed the raw materials according to the following parts by weight: 35 parts of steel slag
sand, 35 parts of coal-to-liquids coarse slag and 30 parts of mechanism sand, among which the
steel slag sand was prepared in Step (1.1). Mixed all the raw materials evenly to obtain fine
aggregate.
Among them, the gradation proportion of steel slag sand was, according to the cumulative
retained percentage, 5mm: 0%, 2.5mm: 17.6%, 1.25mm: 41.6%, 0.63mm: 56.3%,
0.315mm: 76.5%, 0.16mm: 88.0%. The gradation proportion of coal-to-soil coarse slag was,
according to the cumulative retained percentage, >5mm: 3.7%, 2.5mm: 32.1%, 1.25mm: 60.7%,
0.63mm: 77.0%, >0.315mm: 84.9%, 0.16mm: 93.8%. The gradation proportion of the
mechanism sand was, according to the cumulative retained percentage, 5mm: 5.5%, 2.5mm:
12.6%, 1.25mm: 22.3%, 0.63mm: 32.2%, 0.315mm: 69.1%, 0.16mm: 92.2%.
3. Preparation of coarse aggregate
Weighed the raw materials according to the following parts by weight: 30 parts of steel slag,
parts of stone, and then mixed all the raw materials evenly to obtain the coarse aggregate
. Among them, the gradation proportion of steel slag was, according to the cumulative
retained percentage, >20 mm: 2.2%, 16 mm: 8.6%, 10 mm: 16.2%, >5 mm: 77.4%, >2.5 mm:
95.4%. The gradation proportion of stone was, according to the cumulative retained percentage,
>25 mm: 0%, 20 mm: 5.1%, 16 mm: 25.0%, 10 mm: 94.2%, 5 mm: 99.4%, >2.5 mm:
99.9%.
4. Preparation of concrete
Weighed all raw materials according to Table 3, in which the water reducing agent is based
on the dry basis mass, and mixed all the raw materials evenly to obtain the concrete.
Table 3 Concrete Composition (amount of concrete material per cubic meter: kg/m 3 )
Cementitious Water Coarse Fine Water reducing
material aggregate aggregate agent
380 160 980 900 1.52
Comparative Example 1
(1) Preparation of cementitious materials
Weighed the raw materials of desulphurization gypsum, converter steel slag and blast furnace
water quenched slag according to the following parts by weight: 65% parts of slag, 25% parts of steel slag and 10% parts of gypsum. The raw materials were conveyed by a belt conveyor to the vertical mill for mixed grinding. After grinding, they were separated with a powder separator, and the specific surface area of the cementitious material was controlled to be 600m 2 /kg, the particle size range between 0 and 130tm, a residue of 1.8% retained on sieve of 0.045mm, and a residue of 1.8% retained on sieve of 0.080mm.
2. Fine aggregate
The gradation proportion of the mechanism sand as fine aggregate was, according to the
cumulative retained percentage, 5mm: 7.5%, 2.5mm: 31.3%, 1.25mm: 44.5%, 0.63mm:
59.5%, 20.315mm: 74.5%, 20.16mm: 92.3%.
3. Crude aggregate
The gradation proportion of stone as coarse aggregate was, according to the cumulative
retained percentage, >25mm: 0%, >20 mm: 5.1%, 16 mm: 25.0%, >10 mm: 94.2%, >5 mm:
99.4%, >2.5 mm: 99.9%.
(4) Preparation of concrete
Weighed all the raw materials according to Table 3, in which the water reducing agent is
based on dry basis mass, and mixed all the raw materials to obtain the concrete.
Table 3 Concrete Composition (amount of concrete material per cubic meter: kg/m 3 )
Cementitious Water Coarse Fine Water reducing
material aggregate aggregate agent
380 160 980 900 1.52
The concrete was prepared according to the preparation method described in
EMBODIMENT 1-3, in which the concrete was mixed evenly with a concrete mixer in step 4,
was injected into the mould of100mmx100mmx100mm under the condition of temperature
±5°C and a relative humidity of not less than 60%, and was placed on a concrete vibrating
stand for vibrating compaction. The molded test block was cured for 24 hours under the standard curing conditions with a temperature of 20°C+2°Cand a relative humidity of not less than 95%, and then demolded, and cured for 3d, 7d and 28d in the constant temperature and humidity curing box with a curing temperature of 20°C2°C and a relative humidity of not less than 95% in to test the compressive strength of the concrete. The stability test of cementitious material was carried out according to GB/T 1346-2011 Water Requirement of Normal Consistency, Setting Time and
Stability Test Method of Cement. The stability test adopted two methods: the pat test and
Le-chatelier soundness test, and the stability was in line with the national standard. The
comparison of the results of each test is shown in Table 4 below.
Table 4 Comparison of Test Parameters
Compressive strength (MPa) Stability of
3d 7d 28d 56d cementitious
material
EMBODIM 22.0 33.4 48.3 53.3 Qualified
ENT 1
EMBODIM 28.7 36.9 54.7 61.9 Up to the
ENT 2 mark
EMBODIM 30.1 35.8 45.8 49.2 Up to the
ENT 3 mark
Comparative 12.9 24.4 38.0 45.7 Up to the
Example 1 mark
From the table above, the stability of the cementitious material prepared by the invention
conforms to the national standard, and the concrete prepared by the invention has excellent
compressive strength. Through comparison, it can be seen that by utilizing the high content of Al
and Si in coal-to-liquids coarse slag, basing on the 4-coordination homogenization effect and the
complex salt effect of silicon, and synergizing with other components, using coal-to-liquids
coarse slag as cementitious material can produce good cementitious effect and can increase the
early strength and late strength within a certain range, and the coal-to-liquids coarse slag can be
used as green building materials; the same or even better strength effect can be produced by replacing part of the aggregates with coal-to-liquids coarse slag and steel slag sand respectively; controlling the gradation of coal-to-liquids coarse slag and steel slag sand is better than that of single mechanism sand and stone, and is beneficial to increase the compactness of concrete, thereby greatly reducing the problems influencing durability such as corrosion of steel bar and crystalline bloom, and reducing the use of mechanism sand and stone in concrete, which is not only beneficial to save cost, but also conducive to reducing explore stone for road construction and protecting environment.
At the same time, the coal-to-liquids coarse slag, steel slag, slag and gypsum (especially
desulphurization gypsum and other industrial by-products gypsum) used in the invention are all
industrial solid wastes, which not only solves the problems of the storage and utilization of these
industrial solid wastes, but also provides a new idea for the development of new green building
materials.
The above mentioned are only preferred embodiments of the present invention, but the
protection scope of the present invention is not limited to this. Any change or replacement that
may be easily conceived by a technician familiar with the technical field of the present invention
within the technical scope disclosed by the present invention shall be covered within the
protection scope of the present invention. Therefore, the protection scope of the invention shall be
subject to the protection scope of the claims.
Claims (10)
1 A concrete containing coal-to-liquids coarse slag, which is characterized in that it
comprises the following raw materials in parts by weight: 15-20 parts of cementitious materials,
-40 parts of fine aggregate, 40-50 parts of coarse aggregate, 3.75-9 parts of water and 0.015-0.4
parts of water reducing agent.
Among them, the cementitious materials comprise the following raw materials in parts by
weight: 3-30 parts of coal-to-liquids coarse slag, 20-60 parts of slag, 10-40 parts of steel slag,
-20 parts of gypsum and 2-15 parts of cement.
2. The concrete, as stated in claim 1, is characterized in that the gypsum is one or more of the
desulphurization gypsums, phosphogypsum, fluorogypsum, lemon gypsum and waste ceramic
mold.
3. The concrete, as stated in claim 1, is characterized in that the fine aggregate comprises the
following parts by weight: 10-50 parts of steel slag sand, 10-50 parts of coal-to-liquids coarse slag
and 20-40 parts of mechanism sand.
4. The concrete mentioned in claim 3 is characterized in that, in the fine aggregate,
The gradation proportion of the steel slag sand is, based on the cumulative retained
percentage, 25mm: 0%, >2.5mm: 15%-20%, >1.25mm: 37%-45%, >0.63mm: 52%-58%,
20.315mm: 70%-78%, >0.16mm: 85%-95%.
The gradation proportion of the coal-to-liquids coarse slag is, based on the cumulative
retained percentage, 25mm: 0%-4%, >2.5mm: 25%-35%, >1.25mm: 55%-65%, 20.63mm:
%-78%, >0.315mm: 82%-87%,>0.16mm: 88%-95%;
The gradation proportion of the mechanism sand is, based on the cumulative retained
percentage, 25mm: 0%-8%, >2.5mm: 28%-35%, >1.25mm: 40%-48%, >0.63mm: 54%-62%,
0.315mm: 68%-76%, >0.16mm: 88%-95%.
5. The concrete as described in claim 1 is characterized in that the coarse aggregate
comprises the following parts by weight: 10-30 pieces of steel slag and 70-90 parts of stone.
6. The concrete as stated in claim 5 is characterized in that the gradation proportion of the
steel slag is, based on the cumulative retained percentage, >20mm: 1-10%, >16 mm: 8%-15%,
>10 mm: 15%-30%, >5mm: 30%-88%, >2.5 mm: 80%-97%.
The gradation proportion of the stone is, based on the cumulative retained percentage,
>25mm: 0%, >20mm: 1%-7%, >16mm: 20%-27%, >10mm: 89%-96%, >5 mm: 92%-98%,
22.5mm: 95%-100%.
7. Any of the preparation methods of the concrete described in Claim 1-6 is characterized by
comprising the following steps:
Weigh the cementitious materials, fine aggregate, coarse aggregate, water and
water-reducing agent according to the prescribed parts by weight, and mix the above-mentioned
raw materials to obtain the concrete;
Wherein, the preparation of the cementitious material comprises the following steps:
SI: Crush the raw material of steel slag after iron removal, and sieve the steel slag to obtain
coarse particle I and fine particle I, wherein the coarse particle I has a particle size of greater than
mm, and the fine particle I have a particle size of less than 5mm; continue to crush the coarse
particle I after iron removal to form a closed cycle; separate the fine particle I with a powder
separator to obtain steel slag sand and fine particle II, wherein the steel slag sand has a particle
size of 3-10mm, and the fine particle II has a particle size of less than 3mm; the fine particle II is
the steel slag particle prepared.
S2: Weigh the cement, coal-to-liquids coarse slag, slag, gypsum and the steel slag particles
prepared in Step S according to the prescribed parts by weight, mix the coal-to-liquids coarse
slag, slag, gypsum with steel slag particles, and grind them with a grinding device to obtain fine
particle III, coarse particle II and coarse particle III. After air separation, the fine particle III enters
the dust collector, the coarse particle II falls back to the grinding disc of the grinding device and
are ground continuously, and the coarse particle III continues to be ground with the grinding device after iron removal, thus forming a cycle until all the raw materials enter the dust collector to complete the preparation of the initial cementitious materials;
S3: Mix the initial cementitious materials prepared in Step S2 with the cement uniformly to
obtain the cementitious materials.
Wherein, the particle size of the fine particle III meets the following conditions: 0 <particle
size<130pm; the particle size of the coarse particle II meets the following conditions:
130pm<particle size 3mm; the particle size of the coarse particle III meets the following
conditions: 3mm <particle size< 5mm.
8. The preparation method described in claim 7 is characterized in that the preparation of the
cementitious material also comprises the following step:
The pretreatment by removing the iron from the slag, and/or by drying and dispersing the
gypsum, and/or by drying the coal-to-liquids coarse slag.
9. The preparation method as described in claim 7 is characterized in that, in the preparation
process of the cementitious material, the dust collector produces hot and humid off-gas, which
passes through the pipe into the grinding device and then into the dust collector after air
separation of the particles to form a cycle.
10. The preparation method described in claim 7 is characterized in that the preparation of
the fine aggregate comprises the following steps:
Weigh the raw materials according to the following parts by weight: 10-50 parts of steel slag
sand prepared in Step 1, 10-50 parts of coal-to-liquids coarse slag and 20-40 parts of mechanism
sand; mix these raw materials uniformly to obtain the fine aggregate.
-1/3- Drum-type Measurem Slag de-ironing entscal separator Hot and Drum-type Hot-blas humid de-ironing stove Clos ed off-gas separator cycl e Hot-blas t ＞10mm Fine air Suspension Roller Vibratin ＜10mm Powder Measurem Dust part icles Cementitious Steel slag -type ＜3mm press g screen Separator ent- Vertical mill collec material de-ironing scale tor separator 3mm-10mm Steel Belt-type Feedback slag de-ironing separator Measureme Gypsum Drying nt-scale
Measureme Coal-to-coarse slag Drying nt-scale
Raw material primary treatment system Raw material secondary treatment system
Figure 1
‐2/3‐
intensity/a.u. 10 20 30 40 50 60 70 80 90 2θ/(°)
Figure 2
-3/3-
TEMPERATURE
Figure 3
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| CN115385617A (en) * | 2022-08-12 | 2022-11-25 | 金陵科技学院 | High-performance concrete and preparation method thereof |
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