CN111362599B - Mixed grinding preparation method of steel slag-gypsum composite cementing material - Google Patents
Mixed grinding preparation method of steel slag-gypsum composite cementing material Download PDFInfo
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- CN111362599B CN111362599B CN202010178114.0A CN202010178114A CN111362599B CN 111362599 B CN111362599 B CN 111362599B CN 202010178114 A CN202010178114 A CN 202010178114A CN 111362599 B CN111362599 B CN 111362599B
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- 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
- C04B7/00—Hydraulic cements
- C04B7/14—Cements containing slag
- C04B7/147—Metallurgical slag
- C04B7/153—Mixtures thereof with other inorganic cementitious materials or other activators
- C04B7/21—Mixtures thereof with other inorganic cementitious materials or other activators with calcium sulfate containing activators
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- 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
- C04B7/00—Hydraulic cements
- C04B7/36—Manufacture of hydraulic cements in general
- C04B7/38—Preparing or treating the raw materials individually or as batches, e.g. mixing with fuel
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
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Abstract
The invention relates to a mixed grinding preparation method of a steel slag-gypsum composite cementing material, which comprises the steps of taking steel slag particles, slag and gypsum, mixing the raw materials, grinding the mixture by a grinding device to obtain fine particles II, coarse particles II and coarse particles III, winnowing the fine particles II by hot air, feeding the fine particles II into a dust collector, and allowing the coarse particles II to fall back to a grinding disc of the grinding device for continuous grinding; and (3) continuously grinding the coarse particles III through a grinding device after iron is removed by the iron remover, so as to form circulation until all raw materials enter a dust collector, and thus preparing the cementing material. The material prepared by the mixed powder grinding method has good grade preparation, high activity and high strength; furthermore, the complete process is waste-free, efficient, low in energy consumption and pollution-free through steel slag particle pretreatment and recycling of damp and hot tail gas.
Description
Technical Field
The invention relates to the field of resource utilization of industrial solid wastes and the technical field of building materials, in particular to a mixed grinding preparation method of a steel slag-gypsum composite cementing material.
Background
The cementing material prepared from various solid wastes such as steel slag, gypsum and the like can be directly used as cement under various conditions. If the steel slag-gypsum composite cementing material can be widely applied, more than 90 percent of cement clinker consumption can be reduced in Beijing Ji areas in the future 20 years.
According to statistics, the yield of crude steel in 2018 in China is 92826 ten thousand tons, about 0.15 ton of steel slag is generated when 1 ton of crude steel is produced, and only 13923.9 ten thousand tons of steel slag are generated in 2018 in China through measurement and calculation. However, the comprehensive utilization rate of steel slag is less than 40% as one of the worst solid wastes utilized by steel enterprises at present. The steel slag of a steel mill is generally steel tailings which are subjected to magnetic separation to recover iron, and the steel tailings contain partial residual metallic iron and a large amount of divalent metal ions, and can be used as an exciting agent in a cementing material to excite the activity of the slag. At present, most of steel tailings treatment processes are as follows: the grading grinding-magnetic separation iron removal process has the defects of long treatment process, complex process, high energy consumption, poor comprehensive utilization effect and the like.
In 2018, the pig iron yield in China is 77105.4 ten thousand tons, about 0.35 ton of slag is generated in each 1 ton of pig iron, and only in 2018, 26986.89 ten thousand tons of slag are generated in China through measurement and calculation. The silica tetrahedron with latent hydraulic activity in the slag is 2-3 times of that of cement clinker, and in order to fully exert the activity of the slag, the slag is usually ground by using a vertical mill or a tube mill, and when the slag is compounded with other cementing material components, the homogenization effect is poor.
In addition, desulfurized gypsum, which is one of the activators, contains sulfate having a high purity, and can exert a sulfate-activating effect on the water-hardening siloxahedes in the slag. But the water content is high, and the grinding equipment is easy to adhere in the processing process, so that the grinding efficiency is reduced.
Chinese patent document CN104307614B discloses a method for grinding steel slag powder and producing steel slag powder by a vertical mill, which adopts the same vertical mill to grind steel slag powder and slag powder respectively. The yield of the produced steel slag powder reaches 45t/h, the yield of the slag powder reaches 60t/h, and the specific surface area of the steel slag powder is more than 460m2/kg, specific surface area of slag powder is more than 430m2And/kg, which reaches the national standard. And (3) power consumption of a single product: the steel slag powder reaches 30 kwh/ton, and the slag powder reaches 28 kwh/ton. However, the preparation method has a very long treatment process and a very complex process.
Chinese patent document CN107986643A discloses a steel slag advanced treatment process, which comprises the steps of crushing, screening and magnetic separation of steel slag, and can efficiently recover more than 99% of metal; the grain size of the export tailings is standard and 0-5mm, the content of metallic iron is below 1%, and renewable resources are fully recycled; the comprehensive utilization value of the steel slag is maximized and zero emission of tailings is realized. But the process still belongs to a separate treatment process of the steel slag and does not relate to comprehensive treatment of the cementing material.
Therefore, in order to solve the problems in the prior art, a method for cooperatively treating slag, steel slag and gypsum with low energy consumption needs to be found urgently.
Disclosure of Invention
The invention aims to provide a mixed grinding preparation method of a steel slag-gypsum composite cementing material, which realizes the complete process of no waste, high efficiency, low energy consumption and no pollution and can carry out low-energy consumption cooperative treatment on slag, steel slag and gypsum.
To this end, the first aspect of the present invention provides a method for preparing a mixed powder of a steel slag-gypsum composite cementitious material, comprising,
taking steel slag particles, slag and gypsum, mixing the raw materials, and then grinding the mixture by a grinding device to obtain fine particles II, coarse particles II and coarse particles III, winnowing the fine particles II by hot air, feeding the fine particles II into a dust collector, and returning the coarse particles II to a grinding disc of the grinding device for continuous grinding; the coarse particles III are deironized by an iron remover and then continuously ground by a grinding device, so that circulation is formed until all raw materials enter a dust collector, and the cementing material is prepared;
wherein the particle size of the fine particles III satisfies the following condition: the granularity is more than 0 and less than or equal to 130 mu m; the particle size of the coarse particles II meets the following conditions: the granularity of more than 130 mu m is less than or equal to 3 mm; the particle size of the coarse particles III meets the following conditions: the granularity is more than 3mm and less than or equal to 5 mm.
Further, the steel slag particles are obtained by removing iron from a steel slag raw material, crushing and screening.
Further, the steel slag raw material is one or more of converter steel slag, hot splashing steel slag, hot stuffy steel slag, roller steel slag and electric furnace slag.
Further, the preparation steps of the steel slag particles comprise: the method comprises the following steps of (1) crushing a steel slag raw material after iron removal, and screening to obtain coarse particles I and fine particles I, wherein the granularity of the coarse particles I is larger than 10mm, and the granularity of the fine particles I is smaller than 10 mm; the coarse particles I are continuously crushed after being deironized by an iron remover to form closed cycle; and (3) after the fine particles I are subjected to powder selection by a powder selector, forming steel slag sand and steel slag particles, wherein the granularity of the steel slag sand is 3-10mm, and the granularity of the steel slag particles is less than 3 mm.
Further, a rolling crusher or a jaw crusher is adopted for crushing; preferably a rolling crusher, wherein the distance between two rollers of the rolling crusher is 9-12 mm. Compared with a jaw crusher, the granularity of the steel slag crushed by the roller press is smaller and more uniform.
Further, the preparation method also comprises the following steps: and (4) carrying out iron removal pretreatment on the slag.
Further, the slag is water quenched blast furnace slag.
Further, the gypsum raw material is one or more of desulfurized gypsum, phosphogypsum, fluorgypsum, lemon gypsum and waste ceramic mold gypsum.
Further, in the gel material, the steel slag particles, the slag and the gypsum are respectively as follows according to parts by weight: 5-40 parts of steel slag particles, 20-70 parts of slag and 5-25 parts of gypsum.
Furthermore, the hot air is damp and hot tail gas generated by the dust collector, the tail gas is introduced into the grinding device through a pipeline, particles are winnowed and then enter the dust collector to form circulation.
Further, the iron remover is a drum-type iron remover or a suspension-type iron remover.
Further, the grinding device is a vertical mill.
In a specific implementation mode, the negative pressure inside the vertical mill is (-2500) Pa- (-2800) Pa, the pressure of the grinding roller is 10MPa to 12MPa, the rotating speed of a powder separator is 1050rpm to 1180rpm, the temperature of hot air entering the vertical mill is 225 ℃ to 245 ℃, the pressure of a dust collector inlet is (-2950) Pa- (-3150) Pa, the temperature of a dust collector inlet is 70 ℃ to 85 ℃, the pressure of a dust collector outlet is (-3950) Pa- (-4250) Pa, the temperature of a dust collector outlet is 60 ℃ to 70 ℃, the pressure of a hot air circulating pipeline is (-580) Pa- (-630) Pa, and the thickness of a material layer is 8cm to 15 cm.
By adopting the parameters, the internal pressure and the temperature of the vertical mill are accurately controlled so as toThe pressure and the air volume of the dust collector greatly improve the yield of the vertical mill, the design machine hour yield is 45t/h, the actual machine hour yield is 50t/h-60t/h, the yield of the production line is greatly increased, the energy consumption is effectively reduced, the power consumption of the comprehensive unit ton is less than or equal to 58 kW.h/t, and the gas consumption is less than or equal to 23m3/t。
The specific surface area of the prepared gelled material is 450m2/kg-600m2Per kg; the particle size meets the following conditions: the granularity is more than 0 and less than or equal to 130 mu m; 0.045mm screen residue 1.0-5.0%, 0.080mm screen residue 0-3.0%, and iron content 0.5-2.0%.
Compared with the prior art, the invention has the following advantages:
(1) the preparation method provided by the invention has the advantages of simple and convenient process, short treatment flow, easy operation, low energy consumption, good material grading of mixed grinding, and higher activity and strength than those of independently ground materials under the same condition.
(2) In the grinding process, the hot air winnowing system in the grinding device can effectively select the cementing materials and uniformly mix the cementing materials, and a mixing device is not required to be additionally arranged in the powder bin, so that the method is more economical; the use of hot air improves the powder selection capability, the fineness and the specific surface area of the cementing material are stable, the error is small, the drying effect on the water of the cementing material is proper, and particularly, the probability of hardening phenomenon caused by the early hydration of the cementing material due to the high water content of gypsum is reduced.
(3) In the preparation method, the steel slag raw material is not directly adopted to prepare the cementing material, but the steel slag raw material is subjected to circulating iron removal, crushing and screening, and the obtained steel slag particles are used for preparing the cementing material. The method has simple process and low energy consumption. The steel slag raw material has the characteristics of high hardness and difficult grinding, and the reason is that the steel slag contains hard-to-grind metallic iron particles. The steel slag raw material is crushed to expose part of large-particle metallic iron in advance, and then the exposed iron is effectively removed through an iron removal step, so that the cyclic load of subsequent crushing is reduced, and the grinding efficiency of subsequent grinding is improved.
(4) In the preparation process of the steel slag particles, the generated steel slag sand can be used as a raw material of a building material, the maximization of the comprehensive utilization value of the steel slag is realized, the zero emission of the tailings is realized, and the whole preparation process is non-waste, non-pollution and efficient.
(5) In the preparation method, the wet and hot tail gas is recycled and utilized as circulating hot air for winnowing, so that waste heat recovery is facilitated, the combustion cost of fuel is reduced, zero emission of waste gas is realized, environmental protection is facilitated, the phenomenon that gypsum in the material is dehydrated and decomposed at high temperature is avoided due to the fact that the wet and hot tail gas has considerable humidity, and the property of the material is effectively guaranteed. The material level of the mixed powder grinding is good, and the activity is higher than that of the material which is independently ground under the same condition.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. In the drawings:
FIG. 1 is a schematic flow chart of a mixed grinding method of a steel slag-gypsum composite cementing material.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. The starting materials used in the examples of the present invention are available from conventional commercial sources.
Example 1
The embodiment provides a mixed grinding method of a steel slag-gypsum composite cementing material, which comprises the following steps:
(1) preparation of steel slag particles
Primary crushing and pre-deironing of the steel slag raw material: feeding a converter steel slag raw material, carrying out pre-deironing by using a suspension type deironing device, feeding the steel slag subjected to pre-deironing into a roller press for primary crushing, then feeding the steel slag into a vibrating screen for screening, and producing coarse particles I and fine particles I after screening, wherein the granularity of the coarse particles I is 15mm, and the granularity of the fine particles I is 10 mm; the coarse particles I are returned to the roller press for continuous crushing after being deironized by a roller type deironing device, so that closed cycle is formed; and (3) after the fine particles I are subjected to powder selection by a powder selector, forming steel slag sand and steel slag particles, wherein the granularity of the steel slag sand is 5mm, and the granularity of the steel slag particles is 2.7 mm.
(2) Pretreatment of slag
The blast furnace water quenching slag raw material is fed and deironized in advance by a drum-type deironing device.
(3) Preparation of cementitious Material
Taking the desulfurized gypsum of the power plant, the steel slag particles prepared in the step (1) and the slag obtained after pretreatment in the step (2), and weighing the desulfurized gypsum, the steel slag particles and the slag according to the following parts by weight: 56 parts of slag, 30 parts of steel slag particles and 14 parts of gypsum. Conveying the raw materials to a vertical mill through a belt conveyor for mixed grinding, grinding in a vertical mill system to obtain fine particles III (the particle size is more than 0 and less than or equal to 130 mu m), coarse particles II (the particle size is more than 130 mu m and less than or equal to 3mm) and coarse particles III (the particle size is more than 3mm and less than or equal to 5mm), winnowing, feeding the fine particles III into a dust collector, and returning the coarse particles II to a grinding disc of a grinding device for continuous grinding; and returning the coarse particles III to the vertical mill for continuous grinding after removing iron by the aid of the belt-type iron remover, and thus forming closed circulation until all raw materials enter a dust collector, so that the gel material is prepared.
In the process, damp and hot tail gas generated after dust is collected by the dust collector returns to the vertical mill through a circulating pipeline, so that the damp and hot tail gas is recycled; controlling the negative pressure inside the vertical mill to be minus 2700Pa, the pressure of the grinding roll to be 10MPa, the rotating speed of a powder separator to be 1080rpm, the temperature of hot air entering the vertical mill to be 225 ℃, the pressure of an inlet of a dust collector to be minus 3000Pa, the temperature of an inlet of the dust collector to be 75 ℃, the pressure of an outlet of the dust collector to be minus 4050Pa, the temperature of an outlet of the dust collector to be 65 ℃, the pressure of a damp and hot tail gas circulating pipeline to be minus 595Pa and the thickness of a material layer to be 10.5 cm; the granularity of the return material is 3mm-5mm, and the specific surface area of the prepared cementing material is 500m2Kg, particle size range of 0-130 μm, 0.045mm screen residue 1.8%, 0.080mm screen residue 0.5%, iron content of 1.0-2.0%.
Example 2
The embodiment provides a mixed grinding method of a steel slag-gypsum composite cementing material, which comprises the following steps:
(1) preparation of steel slag particles
Primary crushing and pre-deironing of the steel slag raw material: feeding an electric furnace steel slag raw material, carrying out pre-deironing by using a suspended deironing device, feeding the steel slag subjected to pre-deironing into a roller press for primary crushing, then feeding the steel slag into a vibrating screen for screening, and producing coarse particles I and fine particles I after screening, wherein the granularity of the coarse particles I is 10mm, and the granularity of the fine particles I is 5 mm; the coarse particles I are returned to the roller press for continuous crushing after being deironized by a roller type deironing device, so that closed cycle is formed; and (3) after the fine particles I are subjected to powder selection by a powder selector, forming steel slag sand and steel slag particles, wherein the granularity of the steel slag sand is 3mm, and the granularity of the steel slag particles is 2 mm.
(2) Pretreatment of slag
The blast furnace water quenching slag raw material is fed and deironized in advance by a drum-type deironing device.
(3) Preparation of cementitious Material
Weighing the lemon gypsum, the steel slag particles prepared in the step (1) and the slag obtained after pretreatment in the step (2) according to the following parts by weight: 65 parts of slag, 25 parts of steel slag particles and 10 parts of gypsum. Conveying the raw materials to a vertical mill through a belt conveyor for mixed grinding, grinding in a vertical mill system to obtain fine particles III (the particle size is more than 0 and less than or equal to 130 mu m), coarse particles II (the particle size is more than 130 mu m and less than or equal to 3mm) and coarse particles III (the particle size is more than 3mm and less than or equal to 5mm), winnowing, feeding the fine particles III into a dust collector, and returning the coarse particles II to a grinding disc of a grinding device for continuous grinding; and returning the coarse particles III to the vertical mill for continuous grinding after removing iron by the aid of the belt-type iron remover, and thus forming closed circulation until all raw materials enter a dust collector, so that the gel material is prepared.
In the process, damp and hot tail gas generated after dust is collected by the dust collector returns to the vertical mill through a circulating pipeline, so that the damp and hot tail gas is recycled; controlling negative pressure-2650 Pa inside the vertical mill, pressure of the grinding roller 11MPa, rotation speed of a powder separator 1010rpm, temperature of hot air entering the vertical mill 225 ℃, inlet pressure-3050 Pa of a dust collector, inlet temperature of the dust collector 70 ℃, outlet pressure-4050 Pa of the dust collector, and pressure of the dust collector in the vertical millThe temperature of the outlet of the device is 65 ℃, the pressure in the wet and hot tail gas circulating pipeline is-590 Pa, and the thickness of the material layer is 10.5 cm; the granularity of the returned material is 3mm-5 mm; the prepared cementing material has the specific surface area of 600m2Kg, particle size range of 0-130 μm, 0.045mm screen residue 1.2%, 0.080mm screen residue 0.3%, iron content of 1.0-2.0%.
Comparative example 1
Taking power plant desulfurized gypsum, converter steel slag raw materials and blast furnace water-quenched slag raw materials, and weighing the following components in parts by weight: 65 parts of slag, 25 parts of steel slag particles and 10 parts of gypsum. Conveying the raw materials to a vertical mill through a belt conveyor for mixing and grinding, then selecting the powder in a powder selecting machine, and controlling the specific surface area of the cementing material to be 600m2Kg, particle size range of 0-130 μm, 0.045mm screen residue 1.8%, 0.080mm screen residue 0.5%.
Examples of the experiments
Comparing the gelled materials prepared in example 2 and comparative example 1, the gelled material of comparative example 1 has 28d activity only reaching 93% of that of example 2, and the activity is lower; the milling process of comparative example 1 has 10% higher energy consumption than example 2, and the productivity is only 85% of example 2.
And (II) preparing a mortar test block from the cementing materials prepared in the examples 1-2 and the comparative example 1 according to the water-cement ratio of 0.32, wherein the dosage of the water reducing agent is based on the mortar fluidity of 180-220mm, and the cementing material stability test is carried out according to GB/T1346-2011 method for testing water consumption, setting time and stability of cement standard consistency. The stability test adopts two methods of a test cake method and a Rayleigh method for detection, and the stability meets the national standard. The comparison table of the parameters of the results of the tests is shown in Table 1 below
TABLE 1 examination of the cementitious Material
As can be seen from Table 1, the gelled material prepared by the preparation method of the invention has obvious advantages in both flexural strength and compressive strength compared with the gelled material in comparative example 1; in the case of long-distance transportation and pumping, the initial setting time is longer; when the concrete is prepared under the same condition, the working performance is better. When the cementing material is used for preparing products such as concrete prefabricated parts and the like with high requirements on early strength, the turnover of a mold can be accelerated, and the time cost is saved; the compactness of the cement concrete structure is closely related to the water consumption, the water consumption of the invention is lower, the compactness of the cement concrete structure is high, the occurrence of the corrosion condition of the reinforcing steel bar can be reduced, favorable conditions are provided for preparing high-performance concrete, and the cement concrete can be directly used as cement under various conditions.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (11)
1. A mixed grinding preparation method of a steel slag-gypsum composite cementing material is characterized by comprising the following steps:
taking steel slag particles, slag and gypsum, mixing the raw materials, and then grinding the mixture by a grinding device to obtain fine particles II, coarse particles II and coarse particles III, winnowing the fine particles II by hot air, feeding the fine particles II into a dust collector, and returning the coarse particles II to a grinding disc of the grinding device for continuous grinding; the coarse particles III are deironized by an iron remover and then continuously ground by a grinding device, so that circulation is formed until all raw materials enter a dust collector, and the cementing material is prepared;
wherein the particle size of the fine particles II satisfies the following condition: the granularity is more than 0 and less than or equal to 130 mu m; the particle size of the coarse particles II meets the following conditions: the granularity of more than 130 mu m is less than or equal to 3 mm; the particle size of the coarse particles III meets the following conditions: the granularity is more than 3mm and less than or equal to 5 mm.
2. The preparation method of claim 1, wherein the steel slag particles are obtained by removing iron from a steel slag raw material, crushing and screening; the steel slag raw material is one or more of converter steel slag, hot splashing steel slag, hot stuffy steel slag, roller steel slag and electric furnace slag.
3. The method of claim 2, wherein the step of preparing the steel slag particles comprises: the method comprises the following steps of (1) crushing a steel slag raw material after iron removal, and screening to obtain coarse particles I and fine particles I, wherein the granularity of the coarse particles I is larger than 10mm, and the granularity of the fine particles I is smaller than 10 mm; the coarse particles I are continuously crushed after being deironized by an iron remover to form closed cycle; and after the fine particles I are subjected to powder selection by a powder selector, steel slag sand and steel slag particles are formed, wherein the granularity of the steel slag sand is 3-10mm, and the granularity of the steel slag particles is less than 3 mm.
4. The method of claim 3, wherein the crushing is performed using a roller crusher or a jaw crusher.
5. The method according to claim 4, wherein the crushing is performed by a roller crusher having a distance of 9 to 12mm between two rollers.
6. The method of claim 1, further comprising the steps of: and (4) carrying out iron removal pretreatment on the slag.
7. The production method according to claim 1, wherein the slag is water-quenched blast furnace slag;
the gypsum raw material is one or more of desulfurized gypsum, phosphogypsum, fluorgypsum, lemon gypsum and waste ceramic mold gypsum.
8. The preparation method according to claim 1, wherein the steel slag particles, the slag and the gypsum in the cementitious material are in parts by weight: 5-40 parts of steel slag particles, 20-70 parts of slag and 5-25 parts of gypsum.
9. The preparation method of claim 1, wherein the hot air is a damp and hot tail gas generated by the dust collector, the tail gas is introduced into the grinding device through a pipeline, and the particles are air-separated and then enter the dust collector to form a circulation.
10. The method of claim 1, wherein the milling apparatus is a vertical mill.
11. The preparation method of claim 10, wherein the negative pressure inside the vertical mill is (-2500) Pa- (-2800) Pa, the pressure of the grinding roll is 10MPa-12MPa, the rotation speed of the powder separator is 1050rpm-1180rpm, the temperature of the hot air entering the vertical mill is 225 ℃ to 245 ℃, the pressure of the inlet of the dust collector is (-2950) Pa- (-3150) Pa, the temperature of the inlet of the dust collector is 70 ℃ to 85 ℃, the pressure of the outlet of the dust collector is (-3950) Pa- (-4250) Pa, the temperature of the outlet of the dust collector is 60 ℃ to 70 ℃, the pressure of the hot air circulating pipeline is (-580) Pa- (-630) Pa, and the thickness of the material layer is 8cm to 15 cm.
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| CN110711762A (en) * | 2019-10-23 | 2020-01-21 | 迁安威盛固废环保实业有限公司 | Staged grinding method for steel slag-industrial byproduct gypsum composite powder |
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2020
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| GB446952A (en) * | 1934-10-18 | 1936-05-08 | Krupp Ag | An improved process of making clinker for the production of cement |
| CN104529213A (en) * | 2014-12-17 | 2015-04-22 | 河北金泰成建材股份有限公司 | Method for preparing high-class concrete admixture with composite powder of steel slag and mineral slag |
| CN106966678A (en) * | 2017-04-05 | 2017-07-21 | 北京科技大学 | It is a kind of to cooperate with cemented filling material of solidification arsenic and preparation method thereof |
| CN110606674A (en) * | 2019-10-10 | 2019-12-24 | 郑州沃特节能科技股份有限公司 | Final grinding method of slag and steel slag composite micro powder roller press |
| CN110683774A (en) * | 2019-10-23 | 2020-01-14 | 迁安威盛固废环保实业有限公司 | Cementing material taking slag-steel slag-gypsum as raw material and preparation method thereof |
| CN110711762A (en) * | 2019-10-23 | 2020-01-21 | 迁安威盛固废环保实业有限公司 | Staged grinding method for steel slag-industrial byproduct gypsum composite powder |
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