CN108218259B - Method for preparing concrete by using electrolytic manganese slag as retarder and concrete prepared by method - Google Patents
Method for preparing concrete by using electrolytic manganese slag as retarder and concrete prepared by method Download PDFInfo
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- CN108218259B CN108218259B CN201810051193.1A CN201810051193A CN108218259B CN 108218259 B CN108218259 B CN 108218259B CN 201810051193 A CN201810051193 A CN 201810051193A CN 108218259 B CN108218259 B CN 108218259B
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- 239000002893 slag Substances 0.000 title claims abstract description 143
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 title claims abstract description 115
- 229910052748 manganese Inorganic materials 0.000 title claims abstract description 114
- 239000011572 manganese Substances 0.000 title claims abstract description 114
- 239000004567 concrete Substances 0.000 title claims abstract description 81
- 238000000034 method Methods 0.000 title claims abstract description 49
- 239000000203 mixture Substances 0.000 claims abstract description 71
- 239000004568 cement Substances 0.000 claims abstract description 60
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 48
- 238000001354 calcination Methods 0.000 claims abstract description 41
- 239000002002 slurry Substances 0.000 claims abstract description 39
- 239000000843 powder Substances 0.000 claims abstract description 30
- 239000002994 raw material Substances 0.000 claims abstract description 24
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 21
- 239000000126 substance Substances 0.000 claims abstract description 19
- 239000003607 modifier Substances 0.000 claims abstract description 18
- 238000001035 drying Methods 0.000 claims abstract description 8
- 238000002360 preparation method Methods 0.000 claims description 12
- 235000012054 meals Nutrition 0.000 claims description 11
- 238000003756 stirring Methods 0.000 claims description 11
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 abstract description 36
- 229910021529 ammonia Inorganic materials 0.000 abstract description 18
- 239000004566 building material Substances 0.000 abstract description 4
- 230000000052 comparative effect Effects 0.000 description 17
- 238000002156 mixing Methods 0.000 description 17
- 239000000463 material Substances 0.000 description 16
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 12
- 150000003839 salts Chemical class 0.000 description 8
- 238000012360 testing method Methods 0.000 description 8
- 230000008901 benefit Effects 0.000 description 4
- 229920001732 Lignosulfonate Polymers 0.000 description 3
- 150000007942 carboxylates Chemical class 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229940099596 manganese sulfate Drugs 0.000 description 1
- 239000011702 manganese sulphate Substances 0.000 description 1
- 235000007079 manganese sulphate Nutrition 0.000 description 1
- SQQMAOCOWKFBNP-UHFFFAOYSA-L manganese(II) sulfate Chemical compound [Mn+2].[O-]S([O-])(=O)=O SQQMAOCOWKFBNP-UHFFFAOYSA-L 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
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
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B5/00—Treatment of metallurgical slag ; Artificial stone from molten metallurgical slag
-
- 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
-
- 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
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/20—Retarders
- C04B2103/22—Set retarders
-
- 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)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention relates to the field of building materials, in particular to a method for preparing concrete by using electrolytic manganese slag as a retarder and the concrete prepared by the method; the method comprises the steps of preparing manganese slag into manganese slag slurry, and adding calcined slag powder into the manganese slag slurry to obtain a first mixture; adding an alkaline modifier to the first mixture to obtain a second mixture; drying the second mixture, adding the cement raw material, and calcining to obtain a first calcined substance; adding a water reducing agent and cement clinker into the first calcined substance, and calcining; the concrete prepared by the method contains less ammonia, and the occurrence of the phenomenon of frost is reduced; and the concrete has higher compressive strength, flexural strength and the like.
Description
Technical Field
The invention relates to the field of building materials, in particular to a method for preparing concrete by using electrolytic manganese slag as a retarder and the concrete prepared by the method.
Background
The concrete has the characteristics of rich raw materials, low price and simple production process, so that the consumption of the concrete is increased more and more. Meanwhile, the concrete also has the characteristics of high compressive strength, good durability, wide strength grade range and the like. These characteristics make it very widely used, not only in various civil engineering, that is shipbuilding, machinery industry, ocean development, geothermal engineering, etc., but also concrete is an important material.
As concrete materials and technologies are improved, more and more materials are used for concrete. Manganese is produced at high yield in China, and the metal manganese is prepared by electrolyzing a manganese sulfate solution; a large amount of filter-pressing residues, namely electrolytic manganese residues, are generated in the production process. The waste slag is short of an effective and sustainable benefit path at present, and is generally treated in a landfill mode, but the accumulation amount of the waste slag is increased day by day, so that the waste slag not only invades the land, pollutes the soil and restricts the development of enterprises, but also can cause the pollution of underground water systems.
Currently, manganese slag is being gradually used in the production of building materials, but there are still some problems to be improved in the existing method of using manganese slag. In the prior art, building materials prepared from manganese slag still need to be further improved in compression resistance, folding resistance and the like, and the problems of material blooming and the like need to be improved.
Disclosure of Invention
The invention aims to provide a method for preparing concrete by using electrolytic manganese slag as a retarder, which is beneficial to reducing the content of ammonia in the manganese slag; the concrete preparation method provided by the invention can also improve the strength of the prepared concrete, improve the problem of concrete frosting and improve various performances of the prepared concrete.
Another object of the present invention is to provide a concrete having a low total ammonia content, which can improve the problem of concrete bloom; and the concrete has higher compressive strength, flexural strength and the like.
The invention is realized by adopting the following technical scheme.
The invention provides a method for preparing concrete by using electrolytic manganese slag as a retarder, which comprises the steps of preparing manganese slag into manganese slag slurry, and adding calcined slag powder into the manganese slag slurry to obtain a first mixture; adding an alkaline modifier to the first mixture to obtain a second mixture; drying the second mixture, adding the cement raw material, and calcining to obtain a first calcined substance; and adding a water reducing agent and cement clinker to the first calcined product, and calcining.
The invention provides concrete which is prepared by the method for preparing the concrete by using electrolytic manganese slag as a retarder.
The method for preparing the concrete by using the electrolytic manganese slag as the retarder and the concrete prepared by the method have the advantages that:
in the method for preparing the concrete by using the electrolytic manganese slag as the retarder, the manganese slag slurry is prepared, and part of ammonia contained in the manganese slag can be dissolved in water in the slurry, so that the residual amount of the ammonia in the manganese slag is reduced; according to the invention, the cement raw meal is added into the second mixture for calcination, so that on one hand, the volatilization of residual ammonia in the manganese slag can be increased, on the other hand, the cement raw meal can be converted into cement clinker in the calcination process, the overall compressive strength, the flexural strength and the like of the mixture are improved, and the binding capacity of salt substances in the mixture can be improved, so that the salt substances are not easy to separate out; the water reducing agent and the cement clinker are added into the mixture subjected to primary calcination and then calcined again, so that the volatilization of residual ammonia can be further promoted, the content of ammonia in concrete can be reduced, the content of free water and bound water in the concrete can be further reduced, the compressive strength and the flexural strength of the concrete can be further improved, the binding capacity of salt substances in the concrete can be improved, and the precipitation rate of the salt substances can be reduced.
The concrete has low total content of ammonia, and can reduce the occurrence of the phenomenon of frost; and the concrete has higher compressive strength, flexural strength and the like.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
The concrete prepared by the method using the electrolytic manganese slag as the retarder and the concrete prepared by the method of the embodiment of the invention are specifically described below.
In the method for preparing the concrete by using the electrolytic manganese slag as the retarder, the used raw materials comprise the manganese slag, the slag powder, the alkaline modifier, the cement raw material, the water reducing agent and the cement clinker.
The method comprises the steps of preparing manganese slag into manganese slag slurry, and adding calcined slag powder into the manganese slag slurry to obtain a first mixture.
The preparation method of the manganese slag slurry can comprise the following steps: adding the manganese slag into water, stirring at the rotation speed of 500-1000r/min, preferably adding the manganese slag into the water with the water temperature of 90-120 ℃, and keeping the temperature of the mixture of the manganese slag and the water at 90-120 ℃ during the stirring process. Further, the stirring time may be 3 to 5 hours. After the manganese slag is added into hot water and stirred, the residual ammonia in the manganese slag can be volatilized, so that the residual ammonia amount in the manganese slag is reduced; it is noted that the preparation of the manganese slag slurry at a hotter temperature is also beneficial to the subsequent manganese slag modification. The manganese slag in the invention is powdery, and the particle size can be 200-300 meshes.
And adding the calcined slag powder into the manganese slag slurry prepared by the method, and stirring to obtain a first mixture. In detail, the calcined slag powder may be added to the manganese slag slurry and stirred while the temperature of the manganese slag slurry is not lower than 75 ℃.
Preferably, the weight ratio of the manganese slag to the calcined slag powder is 10-20: 1; furthermore, the calcining temperature of the slag powder is 350-450 ℃, the calcining time is 1-2h, and the particle size of the slag powder is 200-300 meshes.
And adding an alkaline modifier into the first mixture, and uniformly stirring to obtain a second mixture. In detail, the temperature of the first mixture may be maintained at 50 to 60 ℃ when the basic modifier is added to the first mixture; preferably, the weight of the alkaline modifier is 10-12.5% of the weight of the manganese slag. The alkaline modifier in the present invention may be CaO or MgO.
And drying the second mixture, adding the cement raw material, and calcining to obtain a first calcined substance. In detail, the second mixture is left to stand, after it settles, the water of the upper layer is removed, and the mixture of the lower layer is dried. The temperature at which the second mixture is dried may be 100-120 ℃.
Further, the weight ratio of the manganese slag to the cement raw meal can be 25-50:1, the temperature for adding the cement raw meal into the dried second mixture for calcination can be 500-600 ℃, and the calcination time can be 2-3 h.
And adding a water reducing agent and cement clinker to the first calcined product, mixing, and calcining again. In detail, the weight ratio of the added cement clinker to the cement raw meal is 5-10: 1; and the temperature of the first calcined substance added with the cement clinker for calcination can be 400-500 ℃, and the calcination time can be 1-2 h.
The water reducing agent may be at least one of a carboxylate, a lignosulfonate, and sodium hydroxide.
The concrete and the method for preparing the concrete by using the electrolytic manganese slag as the retarder according to the present invention will be further described in detail with reference to the following examples.
Example 1
Adding the manganese slag into water with the temperature of 90 ℃, keeping the temperature of the mixture containing the manganese slag at 90 ℃, and stirring for 5 hours at the rotating speed of 1000r/min to prepare manganese slag slurry.
Adding calcined slag powder (200 meshes) into the manganese slag slurry, and uniformly mixing to obtain a first mixture. The weight ratio of the manganese slag to the slag powder is 10:1, and when the slag powder is added into the manganese slag slurry, the temperature of the manganese slag slurry is 75 ℃. The calcining method of the slag powder comprises the following steps: calcining at 350 deg.C for 2 h.
And adding an alkaline modifier CaO into the first mixture when the temperature of the first mixture is 60 ℃, and uniformly mixing to obtain a second mixture. The weight of the alkaline modifier is 10 percent of the weight of the manganese slag.
And standing the second mixture, removing water on the upper layer after the second mixture is settled, drying the settled material at 120 ℃, adding cement raw materials into the dried material after the second mixture is dried, mixing and calcining the cement raw materials at 500 ℃ for 3 hours to obtain the first calcined material. The weight ratio of the cement raw material to the manganese slag is 1: 25.
And adding a water reducing agent and cement clinker into the first calcined substance, uniformly mixing, and calcining for 2 hours at the temperature of 400 ℃ to obtain the concrete. The water reducing agent is carboxylate, the weight ratio of the cement clinker to the cement raw material is 5:1, and the weight of the water reducing agent can be 2% of the weight of the cement clinker.
Example 2
Adding manganese slag (250 meshes) into water with the temperature of 120 ℃, keeping the temperature of a mixture containing the manganese slag at 120 ℃, and stirring for 3 hours at the rotation speed of 500r/min to prepare manganese slag slurry.
Adding calcined slag powder (300 meshes) into the manganese slag slurry, and uniformly mixing to obtain a first mixture. The weight ratio of the manganese slag to the slag powder is 20:1, and when the slag powder is added into the manganese slag slurry, the temperature of the manganese slag slurry is 80 ℃. The calcining method of the slag powder comprises the following steps: calcining at 450 deg.C for 1 h.
And adding an alkaline modifier MgO into the first mixture when the temperature of the first mixture is 50 ℃, and uniformly mixing to obtain a second mixture. The weight of the alkaline modifier is 12.5 percent of the weight of the manganese slag.
And standing the second mixture, removing water on the upper layer after the second mixture is settled, drying the settled material at the temperature of 100 ℃, adding cement raw materials into the dried material after the second mixture is dried, mixing and calcining the cement raw materials at the calcining temperature of 600 ℃ for 2 hours to obtain the first calcined material. The weight ratio of the cement raw material to the manganese slag is 1: 50.
And adding a water reducing agent and cement clinker into the first calcined substance, uniformly mixing, and calcining for 1h at the temperature of 500 ℃ to obtain the concrete. The water reducing agent is a mixture of carboxylate, lignosulfonate and sodium hydroxide, the weight ratio of the cement clinker to the cement raw meal is 10:1, and the weight of the water reducing agent can be 2.5% of the weight of the cement clinker.
Example 3
Manganese slag (300 meshes) is added into water with the temperature of 100 ℃, the temperature of the mixture containing the manganese slag is kept at 105 ℃, and the mixture is stirred for 4 hours under the condition that the rotating speed is 800r/min, so that manganese slag slurry is prepared.
Adding calcined slag powder (250 meshes) into the manganese slag slurry, and uniformly mixing to obtain a first mixture. The weight ratio of the manganese slag to the slag powder is 15:1, and when the slag powder is added into the manganese slag slurry, the temperature of the manganese slag slurry is 78 ℃. The calcining method of the slag powder comprises the following steps: calcining at 400 deg.C for 1.5 h.
And adding an alkaline modifier CaO into the first mixture when the temperature of the first mixture is 55 ℃, and uniformly mixing to obtain a second mixture. The weight of the alkaline modifier is 11 percent of the weight of the manganese slag.
And standing the second mixture, removing water on the upper layer after the second mixture is settled, drying the settled material at the temperature of 110 ℃, adding cement raw materials into the dried material after the second mixture is dried, mixing and calcining the cement raw materials at the calcining temperature of 550 ℃ for 2.5 hours to obtain the first calcined material. The weight ratio of the cement raw material to the manganese slag is 1: 35.
And adding a water reducing agent and cement clinker into the first calcined substance, uniformly mixing, and calcining for 1.5 hours at the temperature of 440 ℃ to obtain the concrete. The water reducing agent is sodium hydroxide, the weight ratio of the cement clinker to the cement raw material is 7:1, and the weight of the water reducing agent can be 1.8% of the weight of the cement clinker.
Example 4
Manganese slag (200 meshes) is added into water with the temperature of 95 ℃, the temperature of the mixture containing the manganese slag is kept at 110 ℃, and the mixture is stirred for 4.5 hours under the condition that the rotating speed is 600r/min, so that manganese slag slurry is prepared.
Adding calcined slag powder (200 meshes) into the manganese slag slurry, and uniformly mixing to obtain a first mixture. The weight ratio of the manganese slag to the slag powder is 17:1, and when the slag powder is added into the manganese slag slurry, the temperature of the manganese slag slurry is 85 ℃. The calcining method of the slag powder comprises the following steps: calcining at 370 deg.C for 2 h.
And adding an alkaline modifier CaO into the first mixture when the temperature of the first mixture is 53 ℃, and uniformly mixing to obtain a second mixture. The weight of the alkaline modifier is 10.5 percent of the weight of the manganese slag.
And standing the second mixture, removing water on the upper layer after the second mixture is settled, drying the settled material at 105 ℃, adding cement raw materials into the dried material after the second mixture is dried, mixing and calcining the cement raw materials at 520 ℃ for 2.4 hours to obtain the first calcined material. The weight ratio of the cement raw material to the manganese slag is 1: 45.
And adding a water reducing agent and cement clinker into the first calcined substance, uniformly mixing, and calcining for 1.6 hours at the temperature of 470 ℃ to obtain the concrete. The water reducing agent is a mixture of lignosulfonate and sodium hydroxide, the weight ratio of the cement clinker to the cement raw meal is 9:1, and the weight of the water reducing agent can be 3% of that of the cement clinker.
Comparative example 1
The method for preparing concrete in the comparative example 1 is similar to that in the example 1, except that the manganese slag slurry in the comparative example 1 is not prepared from manganese slag, the manganese slag powder is calcined by adding slag powder, an alkaline modifier and cement raw meal, and then the calcined manganese slag powder is calcined again by adding cement clinker, and other parameters and methods are carried out according to the example 1 and are not repeated.
Comparative example 2
The preparation method of comparative example 2 is similar to that of example 1, except that the manganese slag slurry prepared in comparative example 2 is prepared by adding manganese slag into water at 24 ℃ and stirring, and other parameter methods are performed with reference to example 1, and are not repeated herein.
Comparative example 3
Comparative example 3 is prepared in a similar manner to example 1, except that in comparative example 3, cement clinker is directly added to the second mixture and subjected to primary calcination. Other parameters such as the amount of the raw materials are as in example 1, and are not described herein.
The concrete prepared in examples 1 to 4 and comparative examples 1 to 3 was formed into a concrete sample block by a machine-forced molding method, and compressive strength, flexural strength and NH were applied thereto3And (5) testing the release amount. The detection method is carried out by respectively referring to GB/T50081-2001 standard of testing mechanical properties of common concrete and GB/T18588-2001 limit of ammonia released in concrete admixture. The results are shown in Table 1.
TABLE 1 NH of the concrete groups3Amount of release (%) and compressive strength (MPa) and tensile strength (MPa) of concrete
As can be seen from Table 1, NH content of concrete prepared by the preparation method of the present invention3The release amount is obviously reduced; as can be seen from comparison of comparative examples 1 and 2 with examples 1 to 4, the preparation of manganese slag slurry using water having a relatively high temperature according to the present invention can significantly reduce the amount of NH produced3The amount of concrete released.
The compression strength and the breaking strength of the concrete prepared by the preparation method are higher than those of the concrete prepared by the comparative examples 1-3; as can be seen from comparison of comparative examples 1 and 2 with examples 1 to 4, the compressive strength and the flexural strength of the concrete prepared by the method of the invention are better after the manganese slag slurry is prepared by using water with higher temperature; as can be seen from comparison between comparative example 3 and examples 1 to 4, the compressive strength and the flexural strength of the concrete can be significantly improved by adding cement raw materials and cement clinker to the preparation method of the present invention, respectively, and calcining the mixture.
Concrete test pieces with the length, width and height of 10cm prepared in examples 1 to 4 and comparative examples 1 to 3 were prepared by a machine-press forced molding method, and each concrete test piece was respectively placed in an oven with the humidity of 40% and the temperature of 30 ℃, baked for 24 hours, 48 hours and 72 hours, and after each period of baking, the ratio of the surface bloom area of each concrete test piece to the total surface area of each test piece was measured, and the results are shown in table 2.
TABLE 2 area ratio (%) -of blooming phenomenon at different test periods for each test block
As can be seen from the results shown in table 2, the preparation method of the present invention can reduce the concrete blooming phenomenon, i.e., the concrete prepared by the method of the present invention has better wear resistance, frost resistance, impermeability and the like. As can be seen from the comparison results of examples 1-4 and comparative examples 1-2, the method for preparing the manganese slag slurry in the preparation method of the present invention can improve the concrete blooming phenomenon to a certain extent; from the comparison results of examples 1 to 4 and comparative example 3, it is understood that the burning method in the preparation method of the present invention can greatly reduce the concrete blooming phenomenon.
In summary, the method for preparing concrete by using electrolytic manganese slag as retarder and the concrete prepared by the method have the advantages that:
in the method for preparing the concrete by using the electrolytic manganese slag as the retarder, the manganese slag slurry is prepared, and part of ammonia contained in the manganese slag can be dissolved in water in the slurry, so that the residual amount of the ammonia in the manganese slag is reduced; according to the invention, the cement raw meal is added into the second mixture for calcination, so that on one hand, the volatilization of residual ammonia in the manganese slag can be increased, on the other hand, the cement raw meal can be converted into cement clinker in the calcination process, the overall compressive strength, the flexural strength and the like of the mixture are improved, and the binding capacity of salt substances in the mixture can be improved, so that the salt substances are not easy to separate out; the water reducing agent and the cement clinker are added into the mixture subjected to primary calcination and then calcined again, so that the volatilization of residual ammonia can be further promoted, the content of ammonia in concrete can be reduced, the content of free water and bound water in the concrete can be further reduced, the compressive strength and the flexural strength of the concrete can be further improved, the binding capacity of salt substances in the concrete can be improved, and the precipitation rate of the salt substances can be reduced.
The concrete has low total content of ammonia, and can reduce the occurrence of the phenomenon of frost; and the concrete has higher compressive strength, flexural strength and the like.
The embodiments described above are some, but not all embodiments of the invention. The detailed description of the embodiments of the present invention is not intended to limit the scope of the invention as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Claims (6)
1. A method for preparing concrete by using electrolytic manganese slag as a retarder is characterized by comprising the steps of preparing manganese slag into manganese slag slurry, and adding calcined slag powder into the manganese slag slurry to obtain a first mixture;
adding an alkaline modifier to the first mixture to obtain a second mixture;
drying the second mixture, adding cement raw materials, and calcining at the temperature of 500-600 ℃ to obtain a first calcined substance;
adding a water reducing agent and cement clinker into the first calcined product, and calcining;
the preparation method of the manganese slag slurry comprises the following steps: adding manganese slag into water for stirring, wherein the stirring speed is 500-1000r/min, the temperature of the water is 90-120 ℃, and the temperature of the mixture of the manganese slag and the water is kept at 90-120 ℃ in the stirring process;
the temperature for adding the water reducing agent and the cement clinker into the first calcined substance for calcining is 400-500 ℃.
2. The method for preparing concrete by using electrolytic manganese slag as retarder according to claim 1, wherein the weight ratio of the manganese slag to the slag powder is 10-20: 1.
3. The method for preparing concrete by using electrolytic manganese slag as retarder according to claim 1, wherein the weight of the alkaline modifier is 10-12.5% of the weight of the manganese slag.
4. The method for preparing concrete by using electrolytic manganese slag as retarder according to claim 1, wherein the weight ratio of the manganese slag to the cement raw meal is 25-50: 1.
5. The method for preparing concrete by using electrolytic manganese slag as retarder according to claim 1, wherein the weight ratio of the cement raw material to the cement clinker is 1: 5-10.
6. A concrete prepared by the method for preparing the concrete by using the electrolytic manganese slag as the retarder according to any one of claims 1 to 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810051193.1A CN108218259B (en) | 2018-01-18 | 2018-01-18 | Method for preparing concrete by using electrolytic manganese slag as retarder and concrete prepared by method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810051193.1A CN108218259B (en) | 2018-01-18 | 2018-01-18 | Method for preparing concrete by using electrolytic manganese slag as retarder and concrete prepared by method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108218259A CN108218259A (en) | 2018-06-29 |
| CN108218259B true CN108218259B (en) | 2021-07-20 |
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| CN111592260B (en) * | 2020-05-08 | 2021-10-22 | 北京科技大学 | Additive for removing ammonia nitrogen in electrolytic manganese slag and removing method thereof |
| CN114850194B (en) * | 2022-04-28 | 2024-01-30 | 重庆重交再生资源开发股份有限公司 | Electrolytic manganese slag treatment method |
| CN116375383A (en) * | 2022-12-27 | 2023-07-04 | 贵州大学 | Cement admixture prepared from electrolytic manganese slag and preparation method thereof |
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| CN101691047A (en) * | 2009-09-01 | 2010-04-07 | 中国环境科学研究院 | Preparation method of electrolytic manganese slag autoclaved brick |
| CN103553378A (en) * | 2013-11-12 | 2014-02-05 | 宁夏天元锰业有限公司 | Method for preparing cement by utilizing electrolytic manganese residue as retarder |
| CN104030583A (en) * | 2014-06-12 | 2014-09-10 | 贵州省工业固体废弃物综合利用（建材）工程技术研究中心 | Method for preparing cement admixture by use of electrolytic manganese residue and product and application |
| CN104529196A (en) * | 2014-12-10 | 2015-04-22 | 北京科技大学 | Method for extracting ammonium and modifying electrolytic manganese residue |
| CN107445532A (en) * | 2017-08-17 | 2017-12-08 | 长沙中硅水泥技术开发有限公司 | Over cure electrolytic manganese residues concrete and preparation method thereof |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101691047A (en) * | 2009-09-01 | 2010-04-07 | 中国环境科学研究院 | Preparation method of electrolytic manganese slag autoclaved brick |
| CN103553378A (en) * | 2013-11-12 | 2014-02-05 | 宁夏天元锰业有限公司 | Method for preparing cement by utilizing electrolytic manganese residue as retarder |
| CN104030583A (en) * | 2014-06-12 | 2014-09-10 | 贵州省工业固体废弃物综合利用（建材）工程技术研究中心 | Method for preparing cement admixture by use of electrolytic manganese residue and product and application |
| CN104529196A (en) * | 2014-12-10 | 2015-04-22 | 北京科技大学 | Method for extracting ammonium and modifying electrolytic manganese residue |
| CN107445532A (en) * | 2017-08-17 | 2017-12-08 | 长沙中硅水泥技术开发有限公司 | Over cure electrolytic manganese residues concrete and preparation method thereof |
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