CN111548030A - Treatment method of neutralized slag in building material - Google Patents
Treatment method of neutralized slag in building material Download PDFInfo
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- CN111548030A CN111548030A CN202010404625.XA CN202010404625A CN111548030A CN 111548030 A CN111548030 A CN 111548030A CN 202010404625 A CN202010404625 A CN 202010404625A CN 111548030 A CN111548030 A CN 111548030A
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- Prior art keywords
- slag
- kiln
- cement
- materials
- roasting
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Classifications
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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
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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
- C04B7/24—Cements from oil shales, residues or waste other than slag
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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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a method for treating neutralized slag in building materials, which comprises the following steps: (1) weighing raw material neutralization slag and silicon slag; (2) stirring, mixing and molding the neutralization slag and the silicon slag together by using a mixing device; (3) roasting; (4) stacking and placing into a kiln; (5) roasting to obtain a neutralized slag product; the neutralization slag product prepared by the invention is doped into cement, and can generate complementary advantages with silicate cement clinker particles in hydration, so that the hydration strength of the cement is improved, the performance of cement hydration minerals is improved, the requirement of cement consistency on water demand is not increased, and the setting time is in a normal state; the concrete prepared by the method has small fluidity loss and increased slump, and meets the working degree of concrete construction.
Description
Technical Field
The invention belongs to the new technical field of building materials, and particularly relates to a method for treating neutralized slag in building materials, wherein the neutralized slag refers to slag which is discharged from a smelting furnace and is like white mud from rare earth products produced by a rare earth plant, and the neutralized slag is simply called as neutralized slag in the rare earth plant. The invention mixes the neutralization slag evenly, stirs and forms, after natural curing reaches a certain hydration degree, then bakes to obtain the needed product. The product of the invention and silicate cement clinker grind the cement together, can improve cement hydration strength and improve cement hydration performance, the product can be used for grinding the cement alone or together with mixed materials such as slag, volcanic ash and the like, and the ground cement can be comparable with the cement ground by silicate cement clinker; the product also has the advantages of not causing the water consumption of the cement to be higher and the hydration speed to be too fast in the application of the cement.
Background
From the domestic and foreign aspects, the raw materials are most studied as the raw material for producing portland cement clinker by a wet process and then calcined at low temperature (about 1000 ℃) to form sulphoaluminate cement. At present, the most studied method is a treatment method for manufacturing mixed materials in cement production, such as fly ash, grey mountain ash, straw ash and the like, and the key point is that the alkalinity generated by calcium in a solution erodes the vitreous bodies on the surfaces of spheres of the fly ash, the grey mountain ash, the straw ash and the like to generate partial hydration products, and simultaneously destroys the spherical surface bodies of the fly ash, the grey mountain ash, the straw ash and the like, so that highly dispersed silicon dioxide and aluminum oxide contained in the spheres can be exposed; then the product with strong water absorption capacity and high hydration reaction activity function is formed through roasting and dehydration. When the product is used in cement production, the hydration reaction speed of cement can be quickly improved, so that the water quantity of cement paste is greatly improved, and the water quantity of the cement paste is in a violent improvement trend along with the increase of the product dosage; the hydration speed is accelerated, and the condition is also rapidly improved along with the increase of the dosage of the product, so that the slurry is solidified together before being molded. Because the material in cement can cause the increase of the water consumption of the cement and the over-quick setting time, the application is limited to a certain extent, and particularly in the cement for manufacturing commercial concrete, when the consumption is higher, the normal working degree of concrete slurry can be influenced. Until now, many cement companies have stopped producing cement for concrete in order to avoid unnecessary effects of cement on concrete workability.
Disclosure of Invention
The invention provides a method for treating neutralized slag in building materials, which overcomes the defects in the prior art, uses the neutralized slag as a raw material, effectively controls the consistency and the setting time of cement, greatly improves the strength of the cement and reduces the production cost.
The technical scheme provided by the invention is as follows:
the treatment method of the neutralized slag used in the building materials comprises the following steps:
(1) weighing the neutralization slag and the silicon slag according to requirements;
(2) material preparation and forming: stirring, mixing and molding the neutralization slag and the silicon slag through a mixing device, wherein the stirring is performed to fully and uniformly mix materials from different sources, and the stirred materials have certain dispersibility, are not agglomerated and have no dust; the molding is to fully and effectively hydrate the materials when the materials are stacked and enter the kiln;
(3) roasting: the roasting kiln type is determined according to the shape of the formed material, the blocky material can be a three-dimensional kiln type, and the spherical material can be roasted by a drying rotary kiln type;
(4) stacking and kiln entering: stacking and placing in a kiln are carried out at normal temperature, so that the materials are subjected to hydration reaction under the action of water to form more hydrated minerals, and the materials are hydrated until the crystal water contained in the materials is more than or equal to 8 percent and then are placed in the kiln for roasting;
(5) roasting to obtain a neutralized slag product: the roasting temperature of the material kiln is 600-800 ℃, and the circulation is carried out for 30-60 minutes.
Preferably, in the step (5), the optimum temperature for kiln roasting is 700 ℃.
Preferably, in the step (1), the neutralization slag is 100% and the silicon slag is 1% in percentage by weight.
Preferably, the spherical diameter of the spherical material formed in the step (3) is 1-5 mm.
Preferably, the main components of the prepared neutralized slag product are 56-60% of calcium oxide, 17.0-22.0% of silicon dioxide, 8.0-10.0% of aluminum oxide and 2.0-3.0% of ferric oxide.
Compared with the prior art, the invention has the following technical advantages:
(1) the neutralization slag product prepared by the invention is doped into cement, and can generate complementary advantages with silicate cement clinker particles in a hydration process, so that the hydration strength of the cement is improved, the performance of cement hydrated minerals is improved, the requirement of cement consistency on water demand is not increased, the setting time is in a normal state, the loss of the fluidity of the prepared concrete is small, the slump is increased, the working degree of concrete construction is satisfied, and the neutralization slag product in the invention can not generate secondary pollution in the production process and the later use process;
(2) the invention can mix the produced neutralized slag product with silicate cement clinker to grind cement according to actual need, so that the properties of cement strength and the like are further improved on the original basis, the original product forms mineral lattice distortion, the neutralized slag product and the cement clinker and other material particles are mutually hydrated to form hydrated crystals, and new mineral crystals are generated, the small crystals with mineral structures are in compact and reasonable development and growth, and the main mineral components CaO and SiO in the neutralized slag product are promoted to form CaO and SiO2、Al2O3、Fe2O3The method plays a role in activating crystal nuclei, and better realizes the balanced hydration development of quality components of the product, so that the neutralized slag product prepared by the method can produce high-quality safe products with small water requirement, small fluidity loss and the like; meanwhile, under the condition of no portland cement clinker, the cement can be ground by singly using the neutralized slag product in the invention or mixing the neutralized slag product with slag powder and the like, the performance of the cement can be comparable to that of the portland cement clinker (as can be seen by data in serial numbers 4 and 5 in the table I), and the cement can also be ground by using a small amount of the portland cement clinker and the neutralized slag product in the invention (as can be seen by data in serial number 8 in the table I); or high performance cement is milled with a small amount of the neutralized slag product of the present invention and portland cement clinker powder (as can be seen in the data in nos. 6 and 7 of table one).
Detailed Description
The examples are specifically illustrated in tables one and two and in the comparison table one.
The material piled in the kiln is hydrated until the crystal water is equal to or more than 8 percent, and then the material is put in the kiln for roasting, and the temperature of the roasted material in the kiln is 1, 600 ℃, 2, 700 ℃, 3 and 800 ℃.
In general, when the temperature of the material kiln is as low as 600 ℃, the influence of the product on the quality strength and the consistency setting time of the product in the produced cement is large, and when the temperature is higher than 800 ℃, the product quality is not increased much, so the roasting temperature of the product is controlled to be 700 +/-100 ℃. The produced product has the advantages of less water consumption, normal setting time of cement or concrete, low consistency of cement and good fluidity of concrete.
Wherein: the places 1 and 2 in the table I and the table II refer to the prior art.
The data in table one are the results of quality tests of the products in relation to the mix ratio in the actual production of the environmental protection science and technology ltd.
In the table I, the raw materials for processing the neutralization slag and the temperature data of the proportioning and roasting material kiln are listed in a table II, the quantity of the raw materials proportioned in the table II is not changed, the roasting temperature of different materials entering the kiln is changed, the dosage of the neutralization slag and the dosage of the silicon slag are respectively 100 percent and 1 percent, and the roasting temperature of the materials entering the kiln is 600 ℃ in the example 1, 700 ℃ in the example 2 and 800 ℃ in the example 3; in addition, in order to prove the change of the quality performance of the neutralized slag products calcined at 3 different temperatures, the fly ash product at the part 1 and the volcanic ash product at the part 2 in the prior art are used for carrying out corresponding proportion comparison tests, and corresponding data (see the serial numbers 2, 3, 4, 5, 6, 7 and 8 in the table I) are measured and compared.
The second table and the second table are compared, the produced neutralized slag product is used for the performance in cement, and under the condition of the same dosage, the quality technical indexes of the product are better than the technical indexes of the part 1 of the serial number 1, the part 2 of the serial number 2 and the part 2 of the serial number 3, and far exceed the quality performance of the product, particularly the water requirement is reduced, the fluidity of concrete is increased, and the hydration strength of the product is improved.
Claims (5)
1. The treatment method of the neutralized slag used in the building materials is characterized by comprising the following steps:
(1) weighing the neutralization slag and the silicon slag according to requirements;
(2) material preparation and forming: stirring, mixing and molding the neutralization slag and the silicon slag through a mixing device, wherein the stirring is performed to fully and uniformly mix materials from different sources, and the stirred materials have certain dispersibility, are not agglomerated and have no dust; the molding is to fully and effectively hydrate the materials when the materials are stacked and enter the kiln;
(3) roasting: the roasting kiln type is determined according to the shape of the formed material, the blocky material can be a three-dimensional kiln type, and the spherical material can be roasted by a drying rotary kiln type;
(4) stacking and kiln entering: stacking and placing in a kiln are carried out at normal temperature, so that the materials are subjected to hydration reaction under the action of water to form more hydrated minerals, and the materials are hydrated until the crystal water contained in the materials is more than or equal to 8 percent and then are placed in the kiln for roasting;
(5) roasting to obtain a neutralized slag product: the roasting temperature of the material kiln is 600-800 ℃, and the circulation is carried out for 30-60 minutes.
2. The method according to claim 1, wherein the method comprises the steps of: in the step (5), the optimum temperature for the material kiln is 700 ℃.
3. The method according to claim 1, wherein the method comprises the steps of: in the step (1), the neutralization slag accounts for 100 percent and the silicon slag accounts for 1 percent in percentage by weight.
4. The method according to claim 1, wherein the method comprises the steps of: the spherical diameter of the spherical material formed in the step (3) is 1-5 mm.
5. The method according to claim 1, wherein the method comprises the steps of: the main components of the prepared neutralized slag product are 56-60% of calcium oxide, 17.0-22.0% of silicon dioxide, 8.0-10.0% of aluminum oxide and 2.0-3.0% of ferric oxide.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010404625.XA CN111548030A (en) | 2020-05-14 | 2020-05-14 | Treatment method of neutralized slag in building material |
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| CN202010404625.XA CN111548030A (en) | 2020-05-14 | 2020-05-14 | Treatment method of neutralized slag in building material |
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| CN111548030A true CN111548030A (en) | 2020-08-18 |
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| CN202010404625.XA Pending CN111548030A (en) | 2020-05-14 | 2020-05-14 | Treatment method of neutralized slag in building material |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1101629A (en) * | 1994-07-27 | 1995-04-19 | 华南理工大学 | Calicining cement technology by adding rare earth poor ore or rare earth waste slag |
| CN1117948A (en) * | 1994-09-03 | 1996-03-06 | 华南理工大学 | Technology for calcinating clinker by using lanthanon-contained raw material |
| RU2332371C1 (en) * | 2007-01-17 | 2008-08-27 | Юлия Алексеевна Щепочкина | Raw mix for cement manufacturing |
| CN101654317A (en) * | 2009-08-31 | 2010-02-24 | 泰兴市固废建材有限公司 | Method for processing iron cement and sludge in building materials |
| CN109081615A (en) * | 2018-07-11 | 2018-12-25 | 盐城工学院 | A kind of road silicate cement clinker and preparation method thereof based on industrial residue |
-
2020
- 2020-05-14 CN CN202010404625.XA patent/CN111548030A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1101629A (en) * | 1994-07-27 | 1995-04-19 | 华南理工大学 | Calicining cement technology by adding rare earth poor ore or rare earth waste slag |
| CN1117948A (en) * | 1994-09-03 | 1996-03-06 | 华南理工大学 | Technology for calcinating clinker by using lanthanon-contained raw material |
| RU2332371C1 (en) * | 2007-01-17 | 2008-08-27 | Юлия Алексеевна Щепочкина | Raw mix for cement manufacturing |
| CN101654317A (en) * | 2009-08-31 | 2010-02-24 | 泰兴市固废建材有限公司 | Method for processing iron cement and sludge in building materials |
| CN109081615A (en) * | 2018-07-11 | 2018-12-25 | 盐城工学院 | A kind of road silicate cement clinker and preparation method thereof based on industrial residue |
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Application publication date: 20200818 |
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