AU2020103182A4 - Cementitious Material Containing Coal-to-liquids Coarse Slag and Preparation Method Thereof - Google Patents
Cementitious Material Containing Coal-to-liquids Coarse Slag and Preparation Method Thereof Download PDFInfo
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- AU2020103182A4 AU2020103182A4 AU2020103182A AU2020103182A AU2020103182A4 AU 2020103182 A4 AU2020103182 A4 AU 2020103182A4 AU 2020103182 A AU2020103182 A AU 2020103182A AU 2020103182 A AU2020103182 A AU 2020103182A AU 2020103182 A4 AU2020103182 A4 AU 2020103182A4
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- steel slag
- coal
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- 239000002893 slag Substances 0.000 title claims abstract description 230
- 239000000463 material Substances 0.000 title claims abstract description 77
- 239000007788 liquid Substances 0.000 title claims abstract description 68
- 238000002360 preparation method Methods 0.000 title claims abstract description 41
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 99
- 239000010959 steel Substances 0.000 claims abstract description 99
- 239000010440 gypsum Substances 0.000 claims abstract description 51
- 229910052602 gypsum Inorganic materials 0.000 claims abstract description 51
- 239000002994 raw material Substances 0.000 claims abstract description 42
- 238000000034 method Methods 0.000 claims abstract description 31
- 239000002699 waste material Substances 0.000 claims abstract description 5
- 239000002245 particle Substances 0.000 claims description 115
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 104
- 239000000428 dust Substances 0.000 claims description 58
- 239000010419 fine particle Substances 0.000 claims description 57
- 239000011362 coarse particle Substances 0.000 claims description 52
- 229910052742 iron Inorganic materials 0.000 claims description 50
- 238000000227 grinding Methods 0.000 claims description 45
- 238000010409 ironing Methods 0.000 claims description 20
- 239000000843 powder Substances 0.000 claims description 20
- 239000004576 sand Substances 0.000 claims description 17
- 230000000717 retained effect Effects 0.000 claims description 16
- 238000000926 separation method Methods 0.000 claims description 11
- 238000007873 sieving Methods 0.000 claims description 11
- 239000000203 mixture Substances 0.000 claims description 8
- 238000011282 treatment Methods 0.000 claims description 7
- 238000001035 drying Methods 0.000 claims description 6
- 244000248349 Citrus limon Species 0.000 claims description 3
- 235000005979 Citrus limon Nutrition 0.000 claims description 3
- 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 description 2
- 238000011221 initial treatment Methods 0.000 claims 1
- 239000000725 suspension Substances 0.000 claims 1
- 239000002910 solid waste Substances 0.000 abstract description 5
- 238000005265 energy consumption Methods 0.000 abstract description 4
- 230000007613 environmental effect Effects 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 19
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 17
- 239000003245 coal Substances 0.000 description 13
- 238000002309 gasification Methods 0.000 description 10
- 239000000126 substance Substances 0.000 description 9
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 8
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 8
- 239000000292 calcium oxide Substances 0.000 description 8
- 229910052799 carbon Inorganic materials 0.000 description 8
- 238000012360 testing method Methods 0.000 description 8
- 238000004458 analytical method Methods 0.000 description 6
- 229910052710 silicon Inorganic materials 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000002203 pretreatment Methods 0.000 description 5
- 238000011084 recovery Methods 0.000 description 5
- YSGQGNQWBLYHPE-CFUSNLFHSA-N (7r,8r,9s,10r,13s,14s,17s)-17-hydroxy-7,13-dimethyl-2,6,7,8,9,10,11,12,14,15,16,17-dodecahydro-1h-cyclopenta[a]phenanthren-3-one Chemical compound C1C[C@]2(C)[C@@H](O)CC[C@H]2[C@@H]2[C@H](C)CC3=CC(=O)CC[C@@H]3[C@H]21 YSGQGNQWBLYHPE-CFUSNLFHSA-N 0.000 description 4
- 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
- 239000004566 building material Substances 0.000 description 4
- 239000004570 mortar (masonry) Substances 0.000 description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000000265 homogenisation Methods 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- 239000002002 slurry Substances 0.000 description 3
- 238000013112 stability test Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 229910010413 TiO 2 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
- 239000004568 cement Substances 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 239000012071 phase Substances 0.000 description 2
- 238000010850 salt effect Methods 0.000 description 2
- 229910052814 silicon oxide Inorganic materials 0.000 description 2
- 238000003746 solid phase reaction Methods 0.000 description 2
- 229910004298 SiO 2 Inorganic materials 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
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 239000011469 building brick Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 239000004567 concrete Substances 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002050 diffraction method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000284 extract Substances 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
- 238000010169 landfilling Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000009360 ningdong Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 239000000376 reactant Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 238000010671 solid-state reaction Methods 0.000 description 1
- 238000010183 spectrum analysis Methods 0.000 description 1
- 239000002352 surface water Substances 0.000 description 1
- 238000002076 thermal analysis method 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)
- Processing Of Solid Wastes (AREA)
- Disintegrating Or Milling (AREA)
Abstract
The present invention relates to a method of cementitious material containing
coal-to-liquids coarse slag and a preparation method. The cementitious material
comprises 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 and 5-20 parts of gypsum. The
cementitious material makes effective use of solid wastes such as coal-to-liquids
coarse slag, steel slag, slag, gypsum, etc.; the material has good gradation, good
stability and excellent mechanical properties. The invention provides a corresponding
preparation method, which has the advantages of simple process, easy operation, low
energy consumption, no waste, no pollution, high efficiency and environmental
protection.
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Description
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Cementitious Material 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
cementitious material containing coal-to-liquids coarse slag and a preparation
method thereof.
The coal-to-liquids slag belongs to a kind of coal gasification slag, which usually
includes coarse slag and fine slag. The coal gasification slag produced in Yulin City
alone is expected to reach 103.19 million tons by 2020. The coarse slag is generally
produced in gasifier. Under the condition of high temperature and high pressure,
the coal particles are slurried and then discharged at the bottom of the gasifier
through the process of melting, quenching and condensation, and contain certain
moisture and residual carbon. At present, the coal-to-liquids coarse slag is mostly
treated by stockpiling or landfilling. As it contains many kinds of metals, it is easy to
pollute surface water, groundwater and soil, and it is easy to produce dust and so
on.
At present, the coal-to-liquids coarse slag is distributed in Ordos of Inner
Mongolia, Yulin of Shaanxi, Ningdong of Ningxia and Zhundong of Xinjiang. As the
coal grading and utilization has become the main trend of coal gasification industry,
under the background of high-speed development of modern coal chemical
industry in China, there will be an increasing production output of coal-to-liquids coarse slag.
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. The test results show
that the residual carbon of 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 have crystal
morphology and does not contain crystals, and presents a good amorphous state.
XRF (X-ray fluorescence spectrum analysis) analysis results show that this kind of
coal-to-liquids coarse slag contains very rich calcium oxide, silicon oxide, alumina
and a certain amount of iron oxide, wherein the total amount of silicon oxide and
alumina is more than 72%, the content of calcium oxide is more than 15%, the
content of iron oxide is about 5%, adding up to about 93%, and it has the potential
to be used as a high-quality building material and be widely used in the production
of cementitious materials, concrete, building brick, wall material, etc.
The patent document CN108817030A disclosed a method for activating
treatment of a coal gasification slag, which comprises the step 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 reactant rapidly to the
temperature suitable for the solid phase reaction to finally realize the rapid
conversion of silicon-aluminum compounds 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 it has complicated treatment process and high cost.
Therefore, in order to solve the problems in the existing technology, the
technicians in this field are committed to finding a method which is simple,
economical and reasonable, and is able to make full and effective use of the
coal-to-liquids coarse while making comprehensive use of the industrial solid wastes
such as slag, steel slag and gypsum.
The purpose of the present invention is to provide a method of cementitious
material containing coal-to-liquids coarse slag and a preparation method thereof.
The cementitious material has good gradation and can make comprehensive use of
the industrial solid waste such as slag, steel slag and gypsum, and the preparation
method has the advantages that it is simple in process, economical and reasonable.
For this purpose, the first part of the present invention provides a kind of
cementitious material containing coal-to-liquids coarse slag, which comprises the
following raw materials in parts by weight: 3-30 parts of coal-to-liquids coarse slag,
-60 parts of slag, 10-40 parts of steel slag, and 5-20 parts of gypsum.
Wherein, the coal-to-liquids coarse slag is the coarse slag produced in the coal-to-liquids chemical industry.
Further, the slag is water-quenched blast furnace slag.
Further, the steel slag particles are obtained from the steel slag raw material
through the process of iron removal, crushing and sieving; wherein the steel slag
raw material is one or more of the converter steel slag, hot-splashing steel slag, hot
braised steel slag, drum steel slag and electric furnace slag.
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 1, wherein the coarse particle I has a
particle size of greater than 10mm, the fine particle I has a particle size of less than
mm; 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 the steel slag
sand and fine particle II, wherein the steel slag sand has a particle size of 3-10mm,
and the fine particle 11 has a particle of less than 3mm; the fine particle II is the steel
slag particle prepared.
Further, the crushing adopts a roll crusher or a jaw crusher, preferably a roll
crusher, and the granularity of the steel slag after crushing is smaller and more
uniform than that by the jaw crusher.
Further, the gypsum is one or more of desulphurization gypsum,
phosphogypsum, fluorogypsum, lemon gypsum and waste ceramic mold gypsum.
Further, the coal-to-liquids coarse slag comprises the following components in
parts by weight: 13-16 parts of CaO, 45-50 partsof Si 2 , 22-26 parts of A1 2 0 3 , 0-2
parts of MgO, 0-1 part of So 3, 4-6 parts of Fe 203, and 0-3 parts of loss on ignition.
Further, the slag comprises the following components in parts by weight: 38-42
parts of CaO, 24-28 parts of Si0 2 , 13-17 parts of A1 2 0 3 , 8-12 parts of MgO, 1-3 parts of S03, and 0-2 parts of Fe 2 0 3
. Further, the steel slag raw material comprises the following parts by weight:
-49 parts of CaO, 8-12 parts of Si0 2 , 1-4 parts of A1 2 03 , 2-6 parts of MgO, 0-1 part
of S03, and 20-28 parts of Fe 2 0 3
. Further, the gypsum comprises the following components in parts by weight:
46-50 parts of CaO, 0-1 part of SiO 2 , 0-1 part of A1 2 0 3 , 1-3 parts of MgO, and 42-46
parts of S03.
Further, the specific surface area of the cementitious material is
450m 2 /kg-600m2/kg; and the particle size conforms to the following conditions: 0
<particle size130Im; a residue of 1.0-5.0% retained on sieve of 0.045mm, a
residue of 0-3.0% retained on sieve of 0.080mm, and the iron content of 0.5-2.0%.
The second part of the invention provides a preparation method of the
cementitious material, which comprises:
Weigh the coal-to-liquids coarse slag, slag, steel slag particles and gypsum
according to the specified parts by weight, mix the said raw materials and grind
them with a grinding device to obtain fine particle Il, coarse particle II and coarse
particle III. After air separation, the fine particle 11 enters the dust collector, the
coarse particle 11 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 cementitious material;
Wherein, the particle size of the fine particle III meets the following conditions:
<particle size!13Opm; the particle size of the coarse particle 11 meets the following
conditions: 130ptm<particle sizes3mm; the particle size of the coarse particle III
meets the following conditions: 3mm<particle size5mm.
Further, the preparation method also includes the following steps:
The preparation of steel slag particle: crushing the raw material of steel slag
after iron removal, and sieving the steel slag to obtain coarse particle I and fine
particle 1, wherein the coarse particle I has a particle size of larger than 10mm, and
the particle size of fine particle I has a particle size of less than 10mm; separating
the coarse particle I with a powder separator to obtain steel slag sand and fine
particle 1l, wherein the steel slag sand has a particle size of 3-10mm, and the fine
particle II have a particle size of less than 3mm; the fine particle II is the steel slag
particle prepared.
Further, the preparation also includes the following steps:
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.
Further, in the preparation method, 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 1050rpm-1180rpm, 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
°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 t/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 3 /t.
Compared with the prior art, the invention has the following advantages:
(1) The cementitious materials provided by the invention effectively utilize the
coal-to-liquids coarse, as well as solid wastes such as steel slag, slag and gypsum, so
as to reduce the harm to the environment and turn waste into wealth.
(2) The cementitious material provided by the invention utilizes Si and Al with
high content in the coal-to-liquids coarse slag, bases on the 4-coordination
homogenization effect and the complex salt effect of silicon, and synergizes with the
components of other raw materials, so that it has good stability and excellent
mechanical properties.
(3) The preparation method provided by the invention has the advantages of
simple process, easy operation and low energy consumption, and the cementitious
material with excellent performance is obtained through multi-step homogenization
preparation.
(4) 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. In addition, the steel slag sand produced in this process can be used as raw building materials, realizing the non-waste, non-pollution and high-efficiency preparation in the whole process.
(5) In the preparation method of the invention, the use of circulating hot-blast
air for air separation can not only effectively screen the cementitious materials, but
also mix the cementitious materials evenly, so that no additional 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 cementitious materials with small error; the hot-blast air
properly dried the moisture of the cementitious material, which reduces the
probability of early hydration to cause hardening of the 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 cementitious
materials.
Figure 2 is the results of the 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 detail
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 convey the scope of this
disclosure fully to the technical personnel in the field.
The raw materials used in the embodiment of the invention can be obtained
through conventional commercial purchases. The chemical composition of some of
the raw materials used in the embodiment of the invention is listed below:
The coal-to-liquids coarse slag used in the embodiment of the invention has
the chemical composition shown in Table 1. The results of XRD and thermal analysis
on the coal-to-liquids coarse slag are shown in Figures 2 and 3 respectively.
Table 1 Chemical composition analysis of raw material of coal-to-liquids coarse
slag (%).
CaO Si0 2 A12 03 MgO S03 Fe 20 3 TiO 2 Na 20 MnO K20
15.393 47.603 24.737 5.753 1.301 1.029 0.100 1.772 1.5068 0.1773 8 1 2 9 7 9 7 4
SrO BaO Cl ZrO 2 P2 0 5 Cr 2 0 3 Y20 3 NiO CuO In203
0.026 0.009 0.009 0.010 0.024 0.1392 0.0791 0.018 0.0757 0.2186 9 7 1 1 8
Loss
on W0 3 Br Rb 20 Total ignitio
n
0.0036 0.0083 0.0036 99.99 1.6%
The water-quenched blast furnace slag, converter steel slag and
desulphurization gypsum used in the embodiment of the invention have the
chemical composition shown in Table 2.
Table 2 Chemical composition analysis of water-quenched blast furnace slag,
converter slag and desulphurization gypsum (%)
Element CaO Si0 2 A12 0 3 MgO SO 3 Fe 2 0 3 TiO 2 Na 20 MnO
40.569 26.931 15.124 10.827 2.3514 1.1948 0.972 0.641 0.553 Slag 8 5 4 1 9 9 3
47.202 10.723 2.2731 4.5334 0.4071 27.413 0.994 0.214 2.877 Steel slag 1 3 2 8 1 8
48.898 1.3722 0.5707 2.0477 44.831 0.3429 0.033 0.123 0.015 Gypsum 3 9 7 1
K2 0 SrO BaO Cl ZrO 2 P2 0 5
0.4217 0.1096 0.0958 0.0863 0.0492 0.0381
0.0345 0.0908 0.0297 0.2157 -- 2.2335
0.158 0.075 -- 0.2804 -- 0.0292
EMBODIMENT 1
(1) Preparation of steel slag particles
The raw materials of converter steel slag were fed, pre-iron removal was
carried out by a suspension-type de-ironing separator, the steel slag pretreated with
iron removal was put into roller press for primary crushing, and then into vibrating
screen for sieving to obtain coarse particle I and fine particle I, wherein the coarse
particle I had a particle size of greater than 10mm, and the fine particle I had a particle size of less than 5mm; the coarse grains 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 11 were 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 11 was the steel slag particle prepared.
(2) Pretreatment of slag, gypsum and coal-to-liquids coarse slag
The water-quenched blast furnace slag, desulphurization gypsum and
coal-to-liquids coarse slag were pretreated as follows:
The raw materials of water-quenched blast furnace slag were fed, and 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.
(3) Preparation of cementitious materials
The steel slag particles prepared in Step (1) and the slag, gypsum and
coal-to-liquids coarse slag obtained after pre-treatment in Step (2) were weighed
according to the following parts by weight: 5 parts of coal-to-liquids coarse slag, 50
parts of slag, 31 parts of steel slag, 14 parts of desulphurization gypsum; these
materials were conveyed to the vertical mill by a belt conveyor for mixed grinding to
obtain fine particle 111 (0 <particle sizes13Opm), coarse particle II (130ptm<particle
size3mm ) and coarse particle III (3mm<particle size 5mm) in the vertical
grinding system. After air separation, the fine particle I1 entered the dust collector,
the coarse particle 11 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 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 pipeline pipe, thus forming the recovery and reuse of hot and humid off-gas; by controlling the internal negative pressure of vertical mill at -2600Pa, 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 the dust collector at -3020Pa, the inlet temperature of the dust collector at 70°C, the outlet pressure of the dust collector outlet at -4050Pa, the outlet temperature of the dust collector at 650 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 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 1301m, a residue of 1.5% retained on sieve of 0.045mm, a residue of 0.3% retained on sieve of 0.080mm, and the iron content of 1.0-2.0%.
EMBODIMENT 2
(1) Preparation of steel slag particles
The primary crushing and pre-iron removal of the raw material of steel slag:
the raws material 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 1, wherein the
coarse particle I had a particle size of greater than 10mm, and the fine particle I had
a particle size of less than 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 were 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.
(2) Pretreatment of slag, gypsum and coal-to-liquids coarse slag
The water-quenched blast furnace slag, desulphurization gypsum and
coal-to-liquids coarse slag were pretreated as follows:
The raw materials of water-quenched blast furnace slag were fed, and 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.
(3) Preparation of cementitious materials
The steel slag particles prepared in Step (1) and the slag, gypsum and
coal-to-liquids coarse slag obtained by pre-treatment in Step (2) were weighed
according to the following parts by weight: 7 parts of coal-to-liquids coarse slag, 50
parts of slag, 29 parts of steel slag, 14 parts of desulphurization gypsum; these
materials were conveyed to the vertical mill by a belt conveyor for mixed grinding to
obtain fine particle III (0 <particle size130pm), coarse particle II (130ptm<particle
size3mm) 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 11 fell back to the grinding disc to be ground continuously, and; the
coarse particle 11 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 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 pipeline 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 2250 C, the inlet pressure of
the dust collector at -3020Pa, the inlet temperature of the dust collector at 70C, the outlet pressure of the dust collector outlet at -4050Pa, the outlet temperature of the dust collector at 650 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 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 130Im, a residue of 1.5% retained on sieve of 0.045mm, a residue of 0.3% retained on sieve of 0.080mm, and the iron content of 1.0-2.0%.
EXAMPLE 3
(1) Preparation of steel slag particles
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 coarse particle I,
wherein the coarse particle I had a particle size of greater than 10mm, and the fine
particle I had a particle size of less than 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 the fine particle
II were 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.
(2) Pretreatment of slag, gypsum and coal-to-liquids coarse slag
The water-quenched blast furnace slag, desulphurization gypsum and
coal-to-liquids coarse slag were pretreated as follows:
The raw materials of water-quenched blast furnace slag were fed, the iron was
pre-removed with a drum-type de-ironing separator; thedesulphurization gypsum
was dried and dispersed, and the coal-to-liquids coarse slag was dried.
(3) Preparation of cementitious materials
The steel slag particles prepared in Step (1) and the slag, gypsum and
coal-to-liquids coarse slag obtained by pre-treatment in Step (2) were weighed
according to the following parts by weight: 10 parts of coal-to-liquids coarse slag, 48
parts of slag, 29 parts of steel slag, 13 parts of desulphurization gypsum; these
materials were conveyed to the vertical mill by a belt conveyor for mixed grinding to
obtain fine particle 111 (0 <particle size130ptm), coarse particle II (130ptm<particle
size3mm) 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 11 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 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 pipeline pipe, thus forming the recovery and reuse of hot and humid
off-gas; by controlling the internal negative pressure of vertical mill at -2650Pa,
grinding roller pressure at 11MPa, the speed of powder separator at 1010rpm, the
temperature of hot-blast air entering the vertical mill at 2250 C, the inlet pressure of
the dust collector at -3050Pa, the inlet temperature of the dust collector at 70C,
the outlet pressure of the dust collector outlet at -4050Pa, the outlet temperature
of the dust collector at 650 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 returned material at 3mm-5mm, the prepared cementitious material had a
specific surface area of 600m 2/kg, a particle size range between 0 and 130ptm, 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%.
EXAMPLE 4
(1) Preparation of steel slag particles
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 1, wherein
the coarse particle I had a particle size of greater than 10mm, and the fine particle I
had a particle size of less than 5mm; the coarse particle I returned to the roller
press to be crushed continuously after the iron removal by a drum-typede-ironing
separator to form a closed cycle; the steel slag sand and the fine particle 11 were
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 11 had a particle size
of 2mm. The fine particle 11 was the steel slag particle prepared.
(2) Pretreatment of slag, gypsum and coal-to-liquids coarse slag
The water-quenched blast furnace slag, desulphurization gypsum and
coal-to-liquids coarse slag were pretreated as follows:
The raw materials of water-quenched blast furnace slag were fed, the iron was
pre-removed with a drum-type de-ironing separator; thedesulphurization gypsum
was dried and dispersed, and the coal-to-liquids coarse slag was dried.
(3) Preparation of cementitious materials
The steel slag particles prepared in Step (1) and the slag, gypsum and
coal-to-liquids coarse slag obtained by pre-treatment in Step (2) were weighed
according to the following parts by weight: 13 parts of coal-to-liquids coarse slag, 42
parts of slag, 30 parts of steel slag, 15 parts of desulphurization gypsum; these
materials were conveyed to the vertical mill by a belt conveyor for mixed grinding to
obtain fine particle 111 (0 <particle size3OIm), coarse particleII (130pm<particle
size3mm) and coarse particle III (3mm<particle sizeSmm) in the vertical grinding
system. After air separation, the fine particle III entered the dust collector, the coarse particle || fell back to the grinding disc to be ground continuously, and the coarse particle Ill 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 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 pipeline pipe, thus forming the recovery and reuse of hot and humid
off-gas; by controlling the internal negative pressure of vertical mill at -2650Pa,
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
the dust collector at -3050Pa, the inlet temperature of the dust collector at 70°C,
the outlet pressure of the dust collector outlet at -4050Pa, the outlet temperature
of the dust collector at 650 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 returned material at 3mm-5mm, the prepared cementitious material had a
specific surface area of 600m 2/kg, a particle size range between 0 and 1301pm, 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%.
EXAMPLE 5
(1) Preparation of steel slag particles
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 1, wherein the coarse particle I had a particle size of greater than 15mm, and the fine particle I had a particle size of less than 10mm; the coarse particle I returned to the roller press to be crushed continuously after the iron removal by a drum-typede-ironing separator to form a closed cycle; the steel slag sand and fine particle II were 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 11 had a particle size of 2.8mm. The fine particle 11 was the steel slag particle prepared.
(2) Pretreatment of slag, gypsum and coal-to-liquids coarse slag
The water-quenched blast furnace slag, desulphurization gypsum and
coal-to-liquids coarse slag were pretreated as follows:
The raw materials of water-quenched blast furnace slag were fed, and the iron
was pre-removed with a drum-type de-ironing separator; the lemon gypsum was
dried and dispersed; the coal-to-liquids coarse slag was dried.
(3) Preparation of cementitious materials
The steel slag particles prepared in Step (1) and the slag, gypsum and
coal-to-liquids coarse slag obtained by pre-treatment in Step (2) were weighed
according to the following parts by weight: 20 parts of coal-to-liquids coarse slag, 39
parts of slag, 28 parts of steel slag, 13 parts of desulphurization gypsum; these
materials were conveyed to the vertical mill by a belt conveyor for mixed grinding to
obtain fine particle 111 (0 <particle size130im), coarse particleII (130pm<particle
size3mm) 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 11 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 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 pipeline pipe, thus forming the recovery and reuse of hot and humid
off-gas; by controlling the internal negative pressure of vertical mill at -2730Pa,
grinding roller pressure at 9.7MPa, the speed of powder separator at 1080rpm, the
temperature of hot-blast air entering the vertical mill at 225°C, the inlet pressure of
the dust collector at -3080Pa, the inlet temperature of the dust collector at 75°C,
the outlet pressure of the dust collector outlet at -4080Pa, the outlet temperature
of the dust collector at 650 C, the internal pressure of the hot and humid off-gas
circulation pipeline at -595Pa, the thickness of material layer at 10.9cm, the particle
size of 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 1301pm, 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%.
Comparative Example 1
Weighed the raw materials of desulphurization gypsum, converter steel slag
and blast furnace water-quenched slag according to the following quality ratio: 65%
of slag, 25% of steel slag and 10% of gypsum. The raw materials were conveyed by a
belt conveyor to the vertical mill for mixed grinding, and then separated with a
powder separator. The specific surface area of the cementitious material was
controlled to be 600m 2/kg, the particle size range between 0 and130Im, a residue
of 1.8% retained on sieve of 0.045mm, and a residue of 0.5% retained on sieve of
0.080mm.
The cementitious material prepared in Embodiment 1-5 and Comparative
Example 1 were used to prepare the mortar test block according to the
water-binder ratio of 0.32 respectively, and the dosage of water reducing agents was based on the fluidity of mortar at 180-220mm. The stability test of the 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 3.
Table 3 Comparison of strength of mortar test blocks Compressive strength Flexural strength (MPa) Initial Final Stability (MPa) coagu coagu 3d 7d 28d 56d 3d 7d 28d 56d lation lation /min /min EMBODI 21.5 29.3 44.2 51.1 5.4 6.8 8.9 9.2 232 478 Qualified MENT EMBODI 22.9 32.5 48.7 54.9 6.2 7.3 9.1 9.9 218 433 Qualified MENT2 EMBODI 18.0 32.2 43.9 50.7 4.9 6.8 7.9 8.8 209 463 Qualified MENT 3 EMBODI 16.6 30.4 40.0 51.3 4.9 5.8 6.9 7.7 156 462 Qualified MENT 4 EMBODI 15.5 19.2 31.9 43.9 4.1 5.9 6.7 7.5 183 415 Qualified MENT 5 Comparat 19.7 30.1 39.7 45.7 4.3 6.1 7.4 8.3 163 397 Qualified ive Example 1
As can be seen from the table above, the stability of the cementitious material prepared by the invention conforms to the national standard and reaches the standard of 42.5 cement, and has excellent mechanical properties. By comparison, when the content of coal-to-liquids coarse slag is close to 20%, the prepared mortar test block still has high compressive strength and flexural strength. By utilizing the characteristics of high content of Al and Si in the coal-to-liquids coarse slag, basing on the 4-coordination homogenization effect and complex salt effect of silicon, and synergizing with other components, it 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 also be used as green building material. Because the grindability of the coal-to-liquids coarse slag is better than that of the slag, it can increase the efficiency of grinding and reduce the energy consumption during the grinding of the cementitious material; the cost of coal-to-liquids coarse slag is close to 0, under the market condition where the price of slag has been rising all the way, replacing the slag with it to the same degree is beneficial to reduce the production cost.
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 cementitious material containing coal-to-liquids coarse slag, which is
characterized in that it comprises 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
and 5-20 parts of gypsum.
2. The cementitious material mentioned in claim 1 is characterized in that the
steel slag particles are obtained from the steel slag raw material through the
process of iron removal, crushing and sieving; wherein the steel slag raw material is
one or more of the converter steel slag, hot splashing steel slag, hot braised steel
slag, drum steel slag and electric furnace slag.
3. The cementitious material described in claim 1 is characterized in that the
steel slag has a particle size of less than 3mm.
4. The cementitious material described in claim 2 is characterized in that the
preparation of the steel slag particles comprises the following steps: crushing the
raw materials of steel slag after iron removal, sieving the steel slag to obtain coarse
particle I and fine particle I, wherein the coarse particle I has a particle size of larger
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 by a de-ironing separator to form a
closed cycle; and separating the fine particle I with a powder separator to form steel
slag sand and fine particle 11, wherein the steel slag sand has a particle size of 3-10
mm, and the fine particle 11 has a particle size of less than 3 mm; the fine particle 11
is the steel slag particle prepared.
5. The cementitious material as described in claim 1 is characterized in that the
gypsum is one or more of the desulphurized gypsum, phosphogypsum,
fluorogypsum, lemon gypsum and waste ceramic mold gypsum; the slag is
water-quenched blast furnace slag.
6. The cementitious material as described in claim 1 is characterized in that the
specific surface area of the cementitious material is 450m 2/kg-600m 2 /kg; and the
particle size meets the following conditions: 0 <particle size 5130pm; a residual of
1.0-5.0% retained on sieve of 0.045mm, a residual of 0-3.0% retained on sieve of
0.080mm, and the iron content of 0.5-2.0%.
7. Any of the preparation methods of the cementitious material in Claim 1-6 is
characterized in that it includes the following steps:
Weigh the coal-to-liquids coarse slag, slag, steel slag particles and gypsum
according to the prescribed parts by weight, mix these raw materials and grind
them with a grinding device to obtain fine particle 111, coarse particle 11 and coarse
particle III. After air separation, the fine particle III enter the dust collector, the
coarse particle 11 fall back to 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 to
complete the preparation of the cementitious material;
Wherein, the particle size of the fine particleIII meets the following conditions:
<particle sizes130im; the particle size of the coarse particle 11 meets the following
conditions: 130lim<particle sizes3mm; 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 it also
comprises the following steps:
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 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 an air cycle.
10. The preparation method described in claim 9 is characterized in that the
grinding device is a vertical mill, the internal negative pressure of the vertical mill is
(-2500)Pa-(-2800)Pa, the pressure of the grinding roller is 1OMPa-12MPa, the speed
of the powder separator is 1050rpm-1180rpm, the temperature of the hot and
humid exhaust gas entering the vertical mill is 225°C-245°C, the inlet pressure of
the dust collector is (-2950)Pa-(-3150)Pa, the inlet temperature of the dust collector
is 70°C-85°C, and the outlet pressure of the dust collector is (-3950)Pa-(-4250) Pa,
the outlet temperature of dust collector is 60°C-70°C, the inner pressure of the hot
and humid off-gas circulation pipeline is (-580)Pa-(-630)Pa, and the material layer is
8cm-15cm thick.
‐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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Cited By (3)
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| CN113480779A (en) * | 2021-05-21 | 2021-10-08 | 内蒙古万邦清源环保科技有限公司 | Method for preparing composite carbon superfine powder material for rubber by using gasified slag |
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2020
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113480779A (en) * | 2021-05-21 | 2021-10-08 | 内蒙古万邦清源环保科技有限公司 | Method for preparing composite carbon superfine powder material for rubber by using gasified slag |
| CN114773752A (en) * | 2022-05-31 | 2022-07-22 | 安徽工业大学 | Steel slag PVC (polyvinyl chloride) calendered film matrix material and preparation method thereof |
| CN114773752B (en) * | 2022-05-31 | 2023-04-28 | 安徽工业大学 | Steel slag PVC (polyvinyl chloride) calendered film base material and preparation method thereof |
| CN115125349A (en) * | 2022-06-29 | 2022-09-30 | 中冶华天工程技术有限公司 | Direct pressure heat braising intelligent treatment method for molten iron pretreatment desulphurization slag |
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