CN114163148A - Solid waste base cementing material containing molten iron desulphurization tailings and preparation method thereof - Google Patents
Solid waste base cementing material containing molten iron desulphurization tailings and preparation method thereof Download PDFInfo
- Publication number
- CN114163148A CN114163148A CN202111530859.XA CN202111530859A CN114163148A CN 114163148 A CN114163148 A CN 114163148A CN 202111530859 A CN202111530859 A CN 202111530859A CN 114163148 A CN114163148 A CN 114163148A
- Authority
- CN
- China
- Prior art keywords
- molten iron
- tailings
- slag
- solid waste
- desulphurization
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
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
- 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
-
- 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
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a solid waste base cementing material containing molten iron desulphurization tailings and a preparation method thereof, belonging to the field of industrial solid waste resource utilization and building materials, and the solid waste base cementing material comprises the following raw materials in percentage by mass on a dry basis: 10-40% of molten iron desulphurization tailings, 10-30% of steel slag, 20-50% of slag and 5-20% of industrial byproduct gypsum, wherein the molten iron desulphurization tailings, the steel slag, the slag and the industrial byproduct gypsum are singly or mixedly ground to a specific surface area of 500m2/kg～600m2In terms of/kg. The invention prepares the non-fired solid waste based cementing material by the synergy of various solid wastes, fully utilizes the high added value of the molten iron desulphurization tailings, provides a large utilization approach for the construction material field, solves the problems of low early hydration reaction rate, low strength and long coagulation time of the solid waste based cementing material by utilizing the characteristic of high alkalinity, greatly reduces carbon dioxide emission while improving the resource utilization rate, and has obvious economic benefitAnd environmental benefits.
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 solid waste base cementing material containing molten iron desulphurization tailings and a preparation method thereof.
Background
At present, the problems of large newly-increased yield and difficult solution of stockpiling amount exist in industrial solid wastes, and the solid wastes such as slag, steel slag, molten iron desulphurization tailings, gypsum and the like generate huge production amount every year and are stockpiled for a long time, so that the industrial solid wastes not only occupy land resources, but also cause serious harm to the atmosphere, water resources and the like. At present, the rigidity requirement of building materials is continuously increased, but the production process of cement clinker discharges a large amount of harmful substances such as ultrafine dust, sulfide, nitrogen oxide and the like into the atmosphere. Therefore, the supply of the building materials is restricted by rigidity due to cement, environmental protection and other reasons, and the contradiction between the demand and the supply of the building materials, namely 'double rigidity', forces the demand to improve the resource development and utilization level and comprehensively utilize the industrial solid wastes by means of more efficient, economic and environmental protection. The industrial solid wastes are used for producing the cementing material in the field of construction, so that the problem of solid waste stockpiling can be solved, the consumption of cement clinker can be reduced, and the emission of carbon dioxide is greatly reduced.
Most steel tailings after the steel mill is fully iron-selected contain about 3% of residual metallic iron and contain higher divalent metal ions than cement clinker. Therefore, the steel slag can play a good excitation role in slag when being used as a component of a cementing material. The silica tetrahedron with latent hydraulic activity in slag is 2-3 times that of cement clinker, and only 1/5-1/3 is in use as cement admixture, concrete admixture and cementing agent for cemented filling mining. The existing single vertical mill is used for grinding, the particle size distribution of slag powder is concentrated, the particles are flaky, the 28d activity index can only reach 95-98%, and the activity of slag is severely limited. The composition of the industrial by-product gypsum is identical to that of natural gypsum, namely calcium sulfate dihydrate. Because the slag contains a large number of sulfate radicals, the slag can play a role in exciting sulfate to silicon-oxygen tetrahedrons with hydraulic activity in slag to form an aluminite mineral, and the slag can play a role in contributing to the strength of hydrated slurry. The solid waste base cementing material is prepared by the synergistic effect of the steel slag, the industrial byproduct gypsum and the slag, so that the hydration reaction rate of the slag micro powder in the concrete hardening and strength increasing processes is improved, and most of the potential of the slag micro powder for providing silica tetrahedron and aluminum tetrahedron for the C-S-H gel is released. However, compared with ordinary portland cement, the solid waste based cementing material still has the problems of low early strength and long setting time.
In order to make steel products have hydrogen induced cracking resistance, more uniform mechanical properties and higher impact toughness, silicon steel has good electromagnetic properties, thin plate steel has excellent deep drawing properties, etc., rapid development of continuous casting technology under the condition of low sulfur content molten steel is required, so that most steel grades require an average sulfur content of below 0.015% and the sulfur content of some ultra-pure steels is required to be reduced to 0.001%. The traditional blast furnace-converter process is difficult to meet the development requirement of the continuous casting process, and the production can be realized only by adding a molten iron pre-desulfurization process before steelmaking and adding an external refining process after steelmaking. Therefore, the amount of molten iron desulphurization slag generated increases year by year, and about 35kg of desulphurization slag can be generated per ton of molten iron pre-desulphurization process.
The molten iron desulphurization tailings are metallurgical slags discharged after molten iron is subjected to pretreatment desulphurization, cooling and separation deferrization, a common desulfurizer is lime, mainly more than 90% of CaO particles, and in order to ensure that the desulfurizer is fully contacted with the molten iron and remove impurity element sulfur in the molten iron, excessive desulfurizer is usually added in the desulphurization process to cause excess desulfurizer, so that S in the molten iron is removed2-Besides the formation of about 5 percent of CaS, most of the desulfurizing agents have short contact time with high-temperature molten iron and low dead burning degree, and mainly exist in the desulfurized slag in the form of CaO, and after the desulfurized slag is subjected to subsequent processes of water pumping, hot sealing, rolling, iron removal and the like, a large amount of CaO is converted into Ca (OH) under the action of high-temperature water or steam2Meanwhile, the system also contains a small amount of dicalcium silicate, tricalcium silicate and calcium ferrite. Therefore, the molten iron desulphurization tailings are better than the common converter steel slagCa (OH) of more2The alkalinity and saturation pH values are also higher. However, because steel mills have limited space and capacity for disposing the tailings, most steel mills mix and pile the molten iron desulphurization tailings and the converter steel slag together, and the molten iron desulphurization tailings are not available in a large amount in the existing mature building material production technology. In addition, the strong powder pulverization in the hot stuffy cooling process causes the pollution to the environment far exceeding that of converter steel slag and electric furnace steel slag.
At present, no mature large utilization way of the molten iron desulphurization tailings exists in the field of building materials. More related patents also use the molten iron desulfurization tailings which are treated by a special process as a desulfurizing agent for repeated use, or are used for improving soil and treating heavy metal-containing wastewater, and are less used for preparing solid waste base cementing materials in the field of building materials.
Patent (201580079204.1) discloses a method for reusing desulfurized slag. The invention provides a method for reusing desulfurized slag, which can reduce the deviation of contribution of reused desulfurized slag to desulfurization. When molten iron (M) is desulfurized in a molten iron storage container (6) using at least a lime-based fresh desulfurizing agent, desulfurized slag (S2) produced by the desulfurization treatment is collected into any one or more of a plurality of slag storage containers (5), any one or more of the plurality of slag storage containers (5) in which desulfurized slag (S2) is stored is selected as a desulfurizing agent for reuse, the desulfurized slag (S2) stored in the selected slag storage container (5) is used as a desulfurizing agent for reuse (S1) in the subsequent desulfurization treatment of molten iron, and any one or more of the plurality of slag storage containers (5) is selected as a desulfurizing agent for reuse, it is preferable to select the retention time to be longer than a 1 st threshold T (T) for reuseaA short or equal slag container (5) and a lime consumption ratio of 2 nd threshold value XiAt least any 1 slag container (5) among a plurality of or equal slag containers (5). This patent provides a method of reusing desulfurization slag capable of reducing the variation in the contribution of the reused desulfurization slag to desulfurization. Further, the amount of the new lime-based desulfurizing agent used can be reduced, which contributes to reduction in energy consumption for producing the lime-based desulfurizing agent, which requires a large amount of energy for burning limestone to obtain quick lime. The patent only carries out the circulating desulfurization on the desulfurization slag,there is no concern about any problems associated with the use of the hot metal desulfurization tailings for the carbon-free non-fired solid waste-based cementitious material.
The patent (201610743684.3) discloses a method for recycling desulfurized slag, which realizes desulfurization operation by recycling desulfurized slag instead of desulfurizer; the desulfurization slag that drops into simultaneously in the ladle has high temperature, high CaO and high iron content's characteristics, directly pour next ladle desulfurization into with the high temperature state, the water-cooling degeneration that can overcome the desulfurization slag and the air cooling that the difficult separability of slag mixture leads to slow, the recovery value reduces after the water-cooling, the piece is difficult for processing and the big problem of the recycle degree of difficulty such as polluted environment after the cooling greatly, can carry out recycle to the desulfurization slag, and improve the desulfurization efficiency of KR desulfurization, reach the sulfur content of stable control KR terminal point, reduce total slag volume, reduction in production cost. The desulfurizing agent is repeatedly used for the desulfurized slag in a high-temperature thermal state, so that the treatment cost of the desulfurized slag is reduced, but any problem related to the application of the molten iron desulfurization tailings to the solid waste-based cementing material is not involved.
Patent (201410237326.6) discloses a method for regenerating molten iron desulphurization slag. The method comprises the following steps: the molten iron desulphurization slag produced by a steel plant is naturally cooled, crushed by a heavy hammer and then ball-milled, and the hard shell of calcium sulfide on the surface of lime particles is broken in the ball-milling process. After ball milling, the raw materials pass through a screen with 100-250 meshes, oversize materials are returned to be ground for the second time after iron is removed, undersize material fine particles enter a dry magnetic separator for magnetic separation, the magnetic field intensity is 100-150 kA/m, and the obtained iron-containing substances are returned to be sintered or recycled for steelmaking; adding 10-30% of lime into the magnetic separation tailings, uniformly mixing, pressing the mixture on a dry type ball press to form a spherical desulfurizer, and returning the spherical desulfurizer to the metallurgical process for secondary desulfurization. The method recycles a large amount of unreacted lime particles in the molten iron desulphurization slag, is simple to operate, economical and practical, and is particularly suitable for treating the molten iron desulphurization slag by spraying lime powder. The patent does not address any problems associated with the use of hot metal desulfurization tailings for solid waste-based cementitious materials.
The patent (CN201710174100) discloses a method for treating chromium-containing heavy metal wastewater by using molten iron to pretreat desulfurization slag, and relates to a method for treating chromium-containing heavy metal wastewater by using molten iron to pretreat desulfurization slag. The method comprises the following steps: magnetic materials in the molten iron pretreatment desulphurization slag are selected by magnetic separation, the magnetic materials with the diameter less than 5mm are used for reducing hexavalent chromium in chromium-containing heavy metal wastewater, then the tailings of iron selection are added into the wastewater after reduction treatment for chemical precipitation treatment of trivalent chromium and other heavy metal ions, finally the wastewater is discharged after solid-liquid separation, and the water quality of the discharged water reaches the national sewage discharge standard. The patent of the invention does not deal with any problems associated with the use of the hot metal desulfurization tailings for the solid waste-based cementitious material.
The patent (CN201310635087.5) discloses a molten iron desulphurization slag pretreatment, a slag-iron separation method and application of byproducts, belonging to the field of metallurgy. The method comprises the steps of carrying out tank-carrying water pumping, hot smoldering, smashing, screening, ore grinding and magnetic separation on the desulfurized slag to recover iron in the molten iron desulfurized slag; when the metallic iron in the molten iron desulphurization slag is recovered, the MFe in the tailings is reduced to below 1 percent, and the molten iron desulphurization slag can be used as a mixture for cement production. However, this patent does not relate to the use of the hot metal desulfurization tailings in solid waste-based cementitious materials, does not deal with the bulk treatment of hot metal desulfurization tailings, and does not relate to any problems associated with solid waste-based cementitious materials.
Patent (200810015360.3) discloses a method for the environmental protection treatment of molten iron desulphurization slag. The method is characterized in that: (A) carrying out simple heavy hammer crushing after water pumping and dust reduction on the molten iron desulphurization slag, and then screening and sorting; (B) the oversize large slag enters an autogenous mill autogenous grinding system, and is subjected to autogenous grinding, screening and magnetic separation, wherein the part containing iron in the magnetic separation and larger than 5cm is recycled as a smelting raw material; (C) the part of the molten iron desulphurization slag which is less than 5cm and is sieved by the first sieving enters a wet ball mill for ball milling, magnetic separation and separation, the slag and iron are separated, the sulfur content in the iron product is reduced to 5 percent, and the magnetic separation iron-rich product can be used as a sintering batching system; (D) the tailings after magnetic separation can be used as a cement batching system; the technical effect of the patent is as follows: the sprinkling effect is good, no flying dust is formed, the sulfur content in the product is reduced to be below 0.5 percent, the added value of the product is improved, and the treated tailings can be recycled in cement ingredients. The patent provides a method for separating slag and iron of molten iron desulphurization slag, but the tail slag after desulphurization treatment is only used in cement ingredients, and does not relate to any problem related to solid waste based cementing materials.
Patent (CN202011559823.X) discloses a building gel material, a preparation method and application thereof, concrete and a preparation method thereof. The patent provides a building gel material prepared by using steel slag, mineral powder, desulfurized gypsum, rice hull ash, calcium hydroxide and an exciting agent as main raw materials, and the building gel material comprises the following components in parts by mass: 30-60 parts of steel slag, 20-40 parts of mineral powder, 10-20 parts of desulfurized gypsum, 2-5 parts of rice hull ash, 3-6 parts of calcium hydroxide and 0.3-2.7 parts of an excitant. The rice hull ash is added into the solid waste base cementing material prepared by the patent, so that the strength of the cementing material is effectively improved, the dual purposes of solid waste recycling and energy conservation and environmental protection are realized, but the method is limited by resources and disposal conditions, and a large amount of low-price rice hull ash cannot be obtained. The preparation of the cementing material in the patent also needs to add an additive additionally, so that the production process is more complicated while the cost of raw materials is increased, and the patent does not relate to molten iron desulphurization slag.
Therefore, the technical personnel in the field need to solve the problem of providing a carbon-free baking-free cementing material which has low preparation cost and high quality of the prepared cementing material and can be prepared by the cooperation of molten iron desulphurization tailings, steel slag and industrial byproduct gypsum.
Disclosure of Invention
The invention aims to provide a solid waste base cementing material containing molten iron desulphurization tailings and a preparation method thereof, which are used for solving the problems in the prior art.
In order to achieve the purpose, the invention provides the following scheme:
the invention provides a solid waste base cementing material containing molten iron desulphurization tailings, which comprises the following raw materials in percentage by mass on a dry basis: 10-40% of molten iron desulphurization tailings, 10-30% of steel slag, 20-50% of slag and 5-20% of industrial byproduct gypsum, wherein the specific surface area of the molten iron desulphurization tailings, the steel slag, the slag and the industrial byproduct gypsum is 500m2/kg～600m2/kg。
Further, the molten iron desulphurization tailings are metallurgical slags obtained by cooling, sorting and deironing in the molten iron pretreatment desulphurization process, and the main chemical components of the metallurgical slags comprise 40-80% of CaO and SiO in percentage by mass25% -20% of Fe2O32-20% of Al2O31-5% and 3-8% of S, and the main mineral phases are calcium hydroxide, dicalcium silicate, tricalcium silicate, and a small amount of calcium sulfide and calcium ferrite.
Further, the steel slag is converter steel slag and/or electric furnace slag, the electric furnace slag is processed by any cooling mode of a hot splashing method, a hot stuffiness method, a roller method, a rolling method, a wind quenching method or a water quenching method, and the main chemical components of the electric furnace slag comprise 30-50% of CaO and SiO in percentage by mass25% -30% of Fe2O310-30% of Al2O32-10 percent of MgO, 2-8 percent of MgO, and the balance of a small amount of oxides of Mn, Ti, V and the like, wherein the main mineral phases are tricalcium silicate, dicalcium silicate, RO phase, ferric oxide and the like, and other indexes meet the requirements of GB/T20491-2017.
Further, the slag is water-quenched blast furnace slag, iron is removed before grinding, and the slag mainly comprises 30-50% of CaO and SiO in percentage by mass220-50% of MgO, 1-10% of MgO and Fe2O30.05-5% of Al2O35-30 percent, and other indexes meet the requirements of GB/T18046-2017.
Further, the industrial byproduct gypsum is one or more of desulfurized gypsum, phosphogypsum, fluorgypsum, lemon gypsum and waste ceramic mold gypsum of a coal-fired power plant, and the main chemical components of the industrial byproduct gypsum are CaO and SO3And a small amount of SiO2And the content of dihydrate gypsum in the phase is not lower than 85%, and other indexes meet the requirements of GB/T21371-2019.
In the present invention, the types of the molten iron desulfurization tailings, the steel slag, the slag, and the industrial by-product gypsum are not particularly limited as long as they meet the requirements of the above-mentioned standards.
The invention also provides a preparation method of the solid waste base cementing material containing the molten iron desulphurization tailings, which comprises the following steps:
(1) crushing raw materials: separately or jointly crushing the molten iron desulfurization tailings and the steel slag into 1-100 mm, and removing iron;
(2) grinding raw materials: grinding the crushed molten iron desulfurization tailings, the steel slag, the slag and the industrial byproduct gypsum in the step (1) independently or in a mixed manner until the specific surface area is 500m2/kg～600m2/kg；
(3) Homogenizing materials: and (3) homogenizing and inspecting the material obtained in the step (2) to obtain the solid waste base cementing material containing the molten iron desulphurization tailings.
Further, in the step (2), the grinding is specifically as follows:
mixing the crushed molten iron desulfurization tailings and steel slag in the step (1) with slag and industrial byproduct gypsum, and then grinding the mixture, wherein the specific surface area of the ground material is 500m2/kg～600m2Per kg; or the like, or, alternatively,
respectively grinding the crushed molten iron desulfurization tailings, the steel slag, the slag and the industrial byproduct gypsum in the step (1) and then mixing, wherein the specific surface area of the mixed materials is 500m2/kg～600m2Per kg; or the like, or, alternatively,
mixing and grinding the crushed steel slag and slag in the step (1) to a specific surface area of 380m2/kg～420m2/kg, and mixing with the crushed molten iron desulfurization tailings obtained in the step (1) and industrial by-product gypsum to obtain mixed powder with the specific surface area of 500m2/kg～600m2/kg。
According to the grindability of the raw materials, the mode of respectively grinding or mixed grinding can be selected.
The grindability refers to the difficulty of grinding the materials, and generally speaking, the grindability is ranked as gypsum, molten iron desulphurization tailings, slag and steel slag, which are industrial byproducts. When raw materials with different grindability are mixed and ground together, the raw materials which are easy to grind are ground to be finer, and the raw materials which are difficult to grind are ground to be thicker. Among the four raw materials, the molten iron desulphurization tailings provide an alkaline environment for the system, the industrial by-product gypsum provides a large amount of sulfate for the system, the steel slag has low self-hydration activity, and the slag contains a large amount of amorphous silicate glass bodies, thereby providing main strength contribution for the system. The complex salt such as ettringite and the like is used as hydration driving force, under the excitation of alkaline environment and sulfate, four raw materials of molten iron desulphurization tailings, slag, steel slag and industrial byproduct gypsum are dissolved, hydrated product is generated, hydrated product is cemented and polycondensed, and the cementitious material with hydration cementation property is formed. The higher the specific surface area of the gelled material, the faster the micro hydration reaction rate and the faster the macroscopic strength increase. Depolymerization and repolymerization of silica tetrahedra and aluminotetrahedra in the slag are the main sources of strength, so the higher the specific surface area of the slag, the faster the hydration reaction, and the higher the strength.
When four raw materials are mixed and ground, the comprehensive specific surface area reaches 500m2/kg～600m2In the case of kg, the actual specific surface area of the slag does not reach 500m because the industrial by-product gypsum and the molten iron desulphurization tailings are easy to grind2/kg～600m2Kg, so the strength is the worst of the three grinding modes.
Respectively grinding the four raw materials, and mixing to 500m2/kg～600m2Kg, which can ensure that the specific surface area of each raw material, particularly slag, meets the requirement, so the strength is highest in the three grinding modes.
Grinding the steel slag and the slag with similar grindability together, grinding the desulfurized tailings and the gypsum with similar grindability together, and finally mixing to 500m2/kg～600m2Kg, strength is centered among the three grinding modes.
The invention discloses the following technical effects:
the molten iron desulphurization tailings are added into the solid waste base cementing material of the slag-steel slag-desulphurization gypsum system, so that the problems of low early alkalinity, slow hydration reaction rate, low compressive strength and long setting time of the system can be effectively solved.
Because the molten iron desulphurization tailings contain a large amount of calcium hydroxide and have high water absorption rate, and the phases of the molten iron desulphurization tailings almost have no tricalcium silicate, the molten iron desulphurization tailings have no hydration activity. Therefore, the cement admixture is not used in cement admixture at present.
The invention solves the problem that the molten iron desulphurization tailings of the steel enterprises are difficult to realize large-scale resource comprehensive utilization, and the solid waste molten iron desulphurization tailings which are difficult to utilize by the steel enterprises and other solid wastes such as slag, steel slag, gypsum and the like of a steel plant are utilized to prepare the carbon-free burning-free solid waste base cementing material in a synergistic manner, thereby solving the problems of low early hydration speed, low strength and long setting time of the solid waste base cementing material. The cementing material prepared by the invention is characterized by completely adopting industrial solid waste, no cement, no carbon, no baking and green environmental protection. The molten iron desulphurization tailings with extremely low grinding cost are used as raw materials to be cooperated with other solid wastes of a steel mill to prepare the solid waste base cementing material, the high calcium hydroxide content of the desulphurization tailings provides an alkaline environment for slag of a solid waste base cementing material system, the desulphurization tailings and steel slag and desulphurization gypsum are cooperated to hydrate, and the hydration hardening and strength increasing process of the system are effectively controlled by taking the crystallization of the ettringite complex salt with ultralow solubility as a reaction driving force.
The method solves the problem that the molten iron desulphurization tailings of the steel enterprises are difficult to realize large-scale recycling comprehensive utilization, and fully utilizes the high alkalinity and hydration reaction activity of the molten iron desulphurization tailings to drive solid wastes such as other slag, steel slag, gypsum and the like of the steel enterprises to cooperatively prepare the carbon-free baking-free solid waste based cementing material, thereby solving the problems of low early hydration speed, low strength and long setting time of the solid waste based cementing material. Meanwhile, the solid waste based cementing material completely adopts solid waste of steel enterprises, greatly reduces raw material and transportation cost, is carbon-free, non-fired, green and environment-friendly in the production process, and has remarkable promoting effect on realizing 'carbon peak reaching' and 'carbon neutralization' fighting targets released by the state.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic flow chart showing a method for producing a solid waste based cementitious material containing molten iron desulfurization tailings according to example 1;
FIG. 2 is a schematic flow chart showing a method for producing the solid waste based cementitious material containing molten iron desulfurization tailings according to example 2;
fig. 3 is a schematic flow chart of a method for preparing the solid waste based cementitious material containing molten iron desulfurization tailings of example 3.
Detailed Description
Reference will now be made in detail to various exemplary embodiments of the invention, the detailed description should not be construed as limiting the invention but as a more detailed description of certain aspects, features and embodiments of the invention.
It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Further, for numerical ranges in this disclosure, it is understood that each intervening value, between the upper and lower limit of that range, is also specifically disclosed. Every smaller range between any stated value or intervening value in a stated range and any other stated or intervening value in a stated range is encompassed within the invention. The upper and lower limits of these smaller ranges may independently be included or excluded in the range.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Although only preferred methods and materials are described herein, any methods and materials similar or equivalent to those described herein can be used in the practice or testing of the present invention. All documents mentioned in this specification are incorporated by reference herein for the purpose of disclosing and describing the methods and/or materials associated with the documents. In case of conflict with any incorporated document, the present specification will control.
It will be apparent to those skilled in the art that various modifications and variations can be made in the specific embodiments of the present disclosure without departing from the scope or spirit of the disclosure. Other embodiments will be apparent to those skilled in the art from consideration of the specification. The description and examples are intended to be illustrative only.
As used herein, the terms "comprising," "including," "having," "containing," and the like are open-ended terms that mean including, but not limited to.
Example 1
The solid waste base cementing material containing the molten iron desulphurization tailings comprises the following raw materials in percentage by mass on a dry basis: 10% of molten iron desulphurization tailings, 30% of steel slag, 50% of slag and 10% of industrial byproduct gypsum, wherein the specific surface area of the molten iron desulphurization tailings, the steel slag, the slag and the industrial byproduct gypsum is 600m2/kg。
The preparation method of the solid waste base cementing material containing the molten iron desulphurization tailings comprises the following steps:
(1) crushing raw materials: adding the molten iron desulfurization tailings and the steel slag into a crusher together for crushing (the crushing can achieve a similar effect by single crushing) to 1-100 mm, and removing iron by using an iron remover;
(2) grinding raw materials: mixing the crushed molten iron desulfurization tailings and steel slag in the step (1) with slag and industrial byproduct gypsum, and then adding the mixture into a ball mill for grinding, wherein the specific surface area of the ground material is 600m2/kg；
(3) Homogenizing materials: and (3) homogenizing and inspecting the material obtained in the step (2) by a mixer to obtain the solid waste base cementing material containing the molten iron desulphurization tailings.
Example 2
The solid waste base cementing material containing the molten iron desulphurization tailings comprises the following raw materials in percentage by mass on a dry basis: 40% of molten iron desulphurization tailings, 10% of steel slag, 40% of slag and 10% of industrial byproduct gypsum, wherein the specific surface area of the molten iron desulphurization tailings, the steel slag, the slag and the industrial byproduct gypsum is 550m2/kg。
The preparation method of the solid waste base cementing material containing the molten iron desulphurization tailings comprises the following steps:
(1) crushing raw materials: separately adding the molten iron desulfurization tailings and the steel slag into a crusher to be crushed (the crushing can achieve a similar effect) to be 1-100 mm, and removing iron by using an iron remover;
(2) grinding raw materials: the molten iron desulphurization tailings crushed in the step (1),The steel slag, the slag and the industrial by-product gypsum are independently added into a ball mill for grinding and then mixed, and the specific surface area of the mixed material is 550m2/kg；
(3) Homogenizing materials: and (3) homogenizing and inspecting the material obtained in the step (2) to obtain the solid waste base cementing material containing the molten iron desulphurization tailings.
Example 3
The solid waste base cementing material containing the molten iron desulphurization tailings comprises the following raw materials in percentage by mass on a dry basis: 20% of molten iron desulphurization tailings, 20% of steel slag, 40% of slag and 20% of industrial byproduct gypsum, wherein the specific surface area of the molten iron desulphurization tailings, the steel slag, the slag and the industrial byproduct gypsum is 500m2/kg。
The preparation method of the solid waste base cementing material containing the molten iron desulphurization tailings comprises the following steps:
(1) crushing raw materials: independently adding the molten iron desulfurization tailings and the steel slag into a crusher to be crushed into 1-100 mm, and removing iron by using an iron remover;
(2) grinding raw materials: mixing the crushed steel slag and slag in the step (1), adding the mixture into a ball mill, and grinding the mixture until the specific surface area is 400m2Kg, mixing with the crushed molten iron desulfurization tailings obtained in the step (1) and industrial byproduct gypsum, and adding into a ball mill for grinding until the specific surface area is 500m2/kg；
(3) Homogenizing materials: and (3) homogenizing and inspecting the material obtained in the step (2) to obtain the solid waste base cementing material containing the molten iron desulphurization tailings.
Example 4
The solid waste base cementing material containing the molten iron desulphurization tailings comprises the following raw materials in percentage by mass on a dry basis: 30% of molten iron desulphurization tailings, 30% of steel slag, 20% of slag and 20% of industrial byproduct gypsum, wherein the specific surface area of the molten iron desulphurization tailings, the steel slag, the slag and the industrial byproduct gypsum is 600m2/kg。
The preparation method of the solid waste base cementing material containing the molten iron desulphurization tailings comprises the following steps:
(1) crushing raw materials: independently adding the molten iron desulfurization tailings and the steel slag into a crusher to be crushed into 1-100 mm, and removing iron;
(2) grinding raw materials: mixing the crushed steel slag and slag in the step (1), adding the mixture into a ball mill, and grinding the mixture to a specific surface area of 420m2Kg, mixing with the crushed molten iron desulfurization tailings obtained in the step (1) and industrial byproduct gypsum, and adding into a ball mill for grinding until the specific surface area is 600m2/kg；
(3) Homogenizing materials: and (3) homogenizing and inspecting the material obtained in the step (2) to obtain the solid waste base cementing material containing the molten iron desulphurization tailings.
Example 5
The solid waste base cementing material containing the molten iron desulphurization tailings comprises the following raw materials in percentage by mass on a dry basis: 40% of molten iron desulphurization tailings, 25% of steel slag, 30% of slag and 5% of industrial byproduct gypsum, wherein the specific surface area of the molten iron desulphurization tailings, the steel slag, the slag and the industrial byproduct gypsum is 530m2/kg。
The preparation method of the solid waste base cementing material containing the molten iron desulphurization tailings comprises the following steps:
(1) crushing raw materials: independently adding the molten iron desulfurization tailings and the steel slag into a crusher to be crushed into 1-100 mm, and removing iron;
(2) grinding raw materials: independently adding the crushed molten iron desulfurization tailings, the steel slag, the slag and the industrial byproduct gypsum in the step (1) into a ball mill for grinding and then mixing, wherein the specific surface area of the mixed material is 530m2/kg；
(3) Homogenizing materials: and (3) homogenizing and inspecting the material obtained in the step (2) to obtain the solid waste base cementing material containing the molten iron desulphurization tailings.
Comparative example 1
The solid waste-based gelling material is different from the solid waste-based gelling material in example 1 only in that the solid waste-based gelling material comprises the following raw materials in percentage by mass on a dry basis: 30% of steel slag, 50% of slag and 20% of industrial by-product gypsum.
Comparative example 2
The solid waste-based gelling material is different from the solid waste-based gelling material in example 2 only in that the solid waste-based gelling material comprises the following raw materials in percentage by mass on a dry basis: 30% of steel slag, 50% of slag and 20% of industrial by-product gypsum.
Comparative example 3
The solid waste-based gelling material is different from the solid waste-based gelling material in example 3 only in that the solid waste-based gelling material comprises the following raw materials in percentage by mass on a dry basis: 30% of steel slag, 50% of slag and 20% of industrial by-product gypsum.
The gelled material products prepared in the above examples and comparative examples, standard sand and water were weighed according to 450g, 1350g and 144g, the water-to-gel ratio was 0.32, and the gelled sand samples were prepared according to GB17671-1999 "Cement mortar Strength detection method" with the sample size of 40mm × 40mm × 160mm, and the samples were cured in a curing box at a temperature of 20 + -1 ℃ and a humidity of 90% or more for strength tests at various ages. The stability test of the cementing material is carried out according to GB/T1346-2011 inspection method for water consumption, setting time and stability of standard consistency of cement. 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 raw material proportions and the parameters of the results of various tests are shown in table 1:
TABLE 1 compounding ratio of solid waste base gelling material and various inspection parameters
As can be seen from Table 1, the cement produced by the process of the present invention has significant advantages in both early strength and late strength over the cement of the comparative example. The mortar test block prepared by the cementing material has high early strength, is beneficial to demolding and winter construction, and can be used for preparing products such as concrete prefabricated parts with high requirements on early strength; the later strength is high, so that the high-grade concrete can be prepared, the use amount of a cementing material can be reduced under the same condition, and the cost is reduced; the water consumption of the standard consistency is lower, so that the structure of the concrete can be more compact, the preparation of a concrete product with higher strength is facilitated, and the durability of the concrete is improved; compared with the preparation method in the embodiment, the preparation method of the comparative example has longer initial and final setting time and lower early compressive strength, and the working performance is inferior to that of solid waste base concrete added with molten iron desulphurization slag when the concrete is prepared under the same condition.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.
Claims (7)
1. The solid waste base cementing material containing the molten iron desulphurization tailings is characterized by comprising the following raw materials in percentage by mass on a dry basis: 10-40% of molten iron desulphurization tailings, 10-30% of steel slag, 20-50% of slag and 5-20% of industrial byproduct gypsum, wherein the specific surface area of the molten iron desulphurization tailings, the steel slag, the slag and the industrial byproduct gypsum is 500m2/kg～600m2/kg。
2. The solid waste-based cementitious material containing molten iron desulphurization tailings of claim 1, wherein the molten iron desulphurization tailings are metallurgical slags obtained by cooling and sorting iron in the molten iron pretreatment desulphurization process.
3. The solid waste-based cementitious material containing molten iron desulphurization tailings of claim 1, wherein the steel slag is converter steel slag and/or electric furnace slag, and the electric furnace slag is processed by any cooling method of hot splashing method, hot stuffiness method, roller pressing method, air quenching method or water quenching method.
4. The solid waste-based cementitious material containing molten iron desulphurization tailings according to claim 1, wherein the slag is water quenched blast furnace slag.
5. The solid waste-based cementitious material containing molten iron desulphurization tailings of claim 1, wherein the industrial by-product gypsum is one or more of coal-fired power plant desulphurization gypsum, phosphogypsum, fluorgypsum, lemon gypsum and waste ceramic mould gypsum.
6. The method for preparing the solid waste based gelled material containing the molten iron desulfurization tailings according to any one of claims 1 to 5, comprising the steps of:
(1) crushing raw materials: separately or jointly crushing the molten iron desulfurization tailings and the steel slag into 1-100 mm, and removing iron;
(2) grinding raw materials: grinding the crushed molten iron desulfurization tailings, the steel slag, the slag and the industrial byproduct gypsum in the step (1) independently or in a mixed manner until the specific surface area is 500m2/kg～600m2/kg；
(3) Homogenizing materials: and (3) homogenizing and inspecting the material obtained in the step (2) to obtain the solid waste base cementing material containing the molten iron desulphurization tailings.
7. The method for preparing the solid waste-based cementitious material containing molten iron desulphurization tailings according to claim 6, wherein in the step (2), the powder grinding is specifically:
mixing the crushed molten iron desulfurization tailings and steel slag in the step (1) with slag and industrial byproduct gypsum, and then grinding the mixture, wherein the specific surface area of the ground material is 500m2/kg～600m2Per kg; or the like, or, alternatively,
respectively grinding the crushed molten iron desulfurization tailings, the steel slag, the slag and the industrial byproduct gypsum in the step (1) and then mixing, wherein the specific surface area of the mixed materials is 500m2/kg～600m2Per kg; or the like, or, alternatively,
mixing and grinding the crushed steel slag and slag in the step (1) to a specific surface area of 380m2/kg～420m2/kg, and mixing with the crushed molten iron desulfurization tailings obtained in the step (1) and industrial by-product gypsum to obtain mixed powder with the specific surface area of 500m2/kg～600m2/kg。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111530859.XA CN114163148A (en) | 2021-12-14 | 2021-12-14 | Solid waste base cementing material containing molten iron desulphurization tailings and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111530859.XA CN114163148A (en) | 2021-12-14 | 2021-12-14 | Solid waste base cementing material containing molten iron desulphurization tailings and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114163148A true CN114163148A (en) | 2022-03-11 |
Family
ID=80486555
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111530859.XA Pending CN114163148A (en) | 2021-12-14 | 2021-12-14 | Solid waste base cementing material containing molten iron desulphurization tailings and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114163148A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115466069A (en) * | 2022-09-09 | 2022-12-13 | 安徽工业大学 | Full-solid waste composite powder for cementing material and preparation method thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN104724958A (en) * | 2014-12-05 | 2015-06-24 | 武汉钢铁(集团)公司 | Modified treatment method for desulphurized, deslagged and washed tail mud of molten iron |
| CN110330242A (en) * | 2019-07-05 | 2019-10-15 | 安徽工业大学 | A kind of compound alkali-activated carbonatite solid waste type high-performance inorganic glue and preparation method thereof |
| CN110357548A (en) * | 2019-07-19 | 2019-10-22 | 迁安威盛固废环保实业有限公司 | A kind of full solid waste concrete of high-early-strength high-performance and preparation method thereof |
| 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 |
-
2021
- 2021-12-14 CN CN202111530859.XA patent/CN114163148A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104724958A (en) * | 2014-12-05 | 2015-06-24 | 武汉钢铁(集团)公司 | Modified treatment method for desulphurized, deslagged and washed tail mud of molten iron |
| 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 |
| CN110330242A (en) * | 2019-07-05 | 2019-10-15 | 安徽工业大学 | A kind of compound alkali-activated carbonatite solid waste type high-performance inorganic glue and preparation method thereof |
| CN110357548A (en) * | 2019-07-19 | 2019-10-22 | 迁安威盛固废环保实业有限公司 | A kind of full solid waste concrete of high-early-strength high-performance and preparation method thereof |
| 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 |
Non-Patent Citations (1)
| Title |
|---|
| 张健: "铁水脱硫渣超细微粉基础性能及应用研究", 《四川建材》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115466069A (en) * | 2022-09-09 | 2022-12-13 | 安徽工业大学 | Full-solid waste composite powder for cementing material and preparation method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Zhao et al. | Research on mineral characteristics of converter steel slag and its comprehensive utilization of internal and external recycle | |
| KR101903438B1 (en) | Non-roasting Pellet Composition Prepared By Using Melted Iron slags and Melted Iron Process By-products, and Pellet Preparation Method | |
| CN104529213A (en) | Method for preparing high-class concrete admixture with composite powder of steel slag and mineral slag | |
| CN108658483A (en) | A kind of method that slag reduction recycling iron and secondary slag prepare complementary cementitious material | |
| CN112851277A (en) | Magnesium-cinder-based novel paving and mining filling material and preparation method thereof | |
| CN101792274A (en) | Calcium-silicon-aluminum property regulating material for carrying out on-line high-temperature reconstruction on medium-alkalinity steel slag and application thereof | |
| CN106277881A (en) | A kind of compounded mineral admixture | |
| CN111285406A (en) | Method for co-recycling alumina red mud and semi-dry desulfurization ash | |
| CN102605113A (en) | Method for modifying high-temperature steel slag by using compound materials of tailings | |
| CN112679195A (en) | Black road brick prepared from steel slag and preparation method thereof | |
| CN113929321A (en) | Optimized magnesium slag-based cementing material and preparation method thereof | |
| CN114804668A (en) | Preparation method of activated carbon-fixing material for producing recycled aggregate | |
| CN102719577A (en) | Method for coupling iron-making and steelmaking slag | |
| CN113979655B (en) | Modified steel slag based on steel dust mud and red mud, and preparation method and application thereof | |
| CN110563353A (en) | Method for preparing steel slag composite micro powder by utilizing slag and steelmaking tailings | |
| CN115093146A (en) | Composite excitant and preparation method and application thereof | |
| CN113880486A (en) | Composite admixture utilizing solid waste of iron and steel plant and preparation method thereof | |
| CN114163148A (en) | Solid waste base cementing material containing molten iron desulphurization tailings and preparation method thereof | |
| CN104673965A (en) | On-line molten steel slag modification method | |
| CN116496008B (en) | Active composite powder based on steel slag and preparation method thereof | |
| CN115572084B (en) | Multi-steel slag synergistic all-solid-waste cementing material and preparation method thereof | |
| CN112080598A (en) | Method and system for comprehensively utilizing slag resources of iron and steel smelting and blast furnace slag tank | |
| JP2012056790A (en) | Steel slag treatment method | |
| CN115716738A (en) | Production process of high-strength steel slag brick | |
| CN115028395A (en) | Solid waste building material product and preparation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |