CN113968684A - Method for treating stainless steel pickling sludge and preparing slag cement - Google Patents
Method for treating stainless steel pickling sludge and preparing slag cement Download PDFInfo
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- CN113968684A CN113968684A CN202111215501.8A CN202111215501A CN113968684A CN 113968684 A CN113968684 A CN 113968684A CN 202111215501 A CN202111215501 A CN 202111215501A CN 113968684 A CN113968684 A CN 113968684A
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- slag
- stainless steel
- pickling sludge
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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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- 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
- C04B7/48—Clinker treatment
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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)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention provides a method for treating stainless steel pickling sludge and preparing slag cement, and relates to the technical field of metallurgy. The method for treating stainless steel pickling sludge and preparing slag cement, provided by the invention, comprises the following steps: mixing the stainless steel pickling sludge, the molten blast furnace slag and a modifier to obtain molten slag; performing cold quenching on the molten slag to obtain granulated slag; grinding the granulated slag to obtain slag powder; and mixing the slag powder and the silicate cement clinker to obtain the slag cement. The invention mixes the stainless steel acid-washing sludge and the molten blast furnace slag, and then quenches the mixture into granulated slag, and then uses slag powder obtained by grinding the granulated slag as a cement admixture to prepare the slag cement, thereby providing an effective way for recycling and harmlessly treating the stainless steel acid-washing sludge.
Description
Technical Field
The invention relates to the technical field of metallurgy, in particular to a method for treating stainless steel pickling sludge and preparing slag cement.
Background
The stainless steel pickling sludge is solid waste precipitated after lime is added into waste water produced by pickling in order to ensure surface smoothness in the stainless steel production process, and is definitely classified as dangerous solid waste because Cr (VI) leaching of the solid waste exceeds the national standard. Stainless steel pickling sludge produced by using sulfuric acid as pickling medium and containing Fe as main component2O3 20～35wt％，CaSO4 45～60wt％，Cr2O3 1～6wt％，SiO22-3 wt%, and no effective treatment way exists for the acid-washing sludge at present. The conventional practice of enterprises is stockpiling or adding a small amount of the raw materials into a sintering process, but the quality of sintered mineral products is reduced and the process pollution is serious (CaSO)4Decomposition to SO2) And the like, and an effective large-scale treatment approach is urgently needed. Therefore, aiming at the treatment difficulty of the stainless steel pickling sludge, the invention firstly provides the method for preparing the slag cement by combining the molten blast furnace slag and the stainless steel pickling sludge by utilizing a physical and chemical solidification method, and reasonably treats the hazardous waste on the premise of not changing the phase and the application approach of the blast furnace slag.
Disclosure of Invention
The invention aims to provide a method for treating stainless steel pickling sludge and preparing slag cement, which is characterized in that the stainless steel pickling sludge is mixed with molten blast furnace slag and then is quenched into granulated slag, and then slag powder obtained by grinding the granulated slag is used as a cement admixture to prepare the slag cement, so that an effective way for recycling and harmlessly treating the stainless steel pickling sludge is provided.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a method for treating stainless steel pickling sludge and preparing slag cement, which comprises the following steps:
mixing the stainless steel pickling sludge, the molten blast furnace slag and a modifier to obtain molten slag;
performing cold quenching on the molten slag to obtain granulated slag;
grinding the granulated slag to obtain slag powder;
and mixing the slag powder and the silicate cement clinker to obtain the slag cement.
Preferably, the water content of the stainless steel pickling sludge is below 5 wt%.
Preferably, the total amount of the stainless steel pickling sludge is 1-10 wt% of the molten blast furnace slag.
Preferably, the temperature of the molten blast furnace slag is 1400-1450 ℃.
Preferably, the mixing time of the stainless steel pickling sludge, the molten blast furnace slag and the modifier is 3-10 min.
Preferably, the cooling rate of the cold quenching is 300-500 ℃/min.
Preferably, the particle size of the slag powder is less than 0.1 mm; the specific surface area of the slag powder is 500m2More than kg.
Preferably, the mass ratio of the slag powder to the portland cement clinker is 40-50: 50-60.
Preferably, the modifier is a siliceous modifier; the total addition amount of the modifier is 1-5 wt% of the molten blast furnace slag.
Preferably, the stainless steel pickling sludge is pickling sludge generated by using sulfuric acid as a pickling medium in a stainless steel production enterprise; the stainless steel pickling sludge comprises CaSO4 45～60wt％，Fe2O3 20～35wt％，Cr2O3 1～6wt％，SiO 2 2～3wt％。
The invention provides a method for treating stainless steel pickling sludge and preparing slag cement, which comprises the following steps: mixing the stainless steel pickling sludge, the molten blast furnace slag and a modifier to obtain molten slag; performing cold quenching on the molten slag to obtain granulated slag; grinding the granulated slag to obtain slag powder; and mixing the slag powder and the silicate cement clinker to obtain the slag cement. The invention adds stainless steel after the blast furnace slag tappingPickling sludge with steel, and cold quenching to obtain granulated slag with glass phase over 99% and dispersed Mg-Cr spinel phase in the least part (blast furnace slag contains small amount of MgO and Cr-containing material is added into the molten slag2O3The acid-washing sludge can generate a corresponding small amount of magnesium-chromium spinel phase), the glass phase and the magnesium-chromium spinel phase are mineral phases with the best chromium fixing effect, and the granulated slag after cold quenching can be used as an admixture for preparing slag cement; after the slag cement is prepared, the glass phase and the magnesium-chromium spinel phase are both wrapped in a gel phase generated by cement hydration, and the Cr element curing effect is obvious and is far lower than the standard value of 0.2mg/L of Cr leaching in the sintered clinker specified in GB 30760-2014.
The invention provides an effective way for harmless, resource and large-scale treatment of the stainless steel pickling sludge, such dangerous solid waste, and has great environmental and economic benefits.
The treatment method provided by the invention is simple to implement, has no additional equipment, can be implemented on the production site, and has low cost and high practical popularization value.
Drawings
FIG. 1 is an SEM image of granulated slag prepared in example 1;
FIG. 2 is a SEM-EDS photograph of magnesia chrome spinel phase at high magnification of granulated slag prepared in example 1;
FIG. 3 is an EDS surface scan energy spectrum of magnesium chromium spinel;
FIG. 4 is an XRD pattern of granulated slag prepared in examples 1 and 2;
FIG. 5 is a graph showing the comparison of the compressive strength of the granulated slag added with the sludge and the normal blast furnace granulated slag after 28 days of hydration;
FIG. 6 is a flow chart of a slag cement production process.
Detailed Description
The invention provides a method for treating stainless steel pickling sludge and preparing slag cement, which comprises the following steps:
mixing the stainless steel pickling sludge, the molten blast furnace slag and a modifier to obtain molten slag;
performing cold quenching on the molten slag to obtain granulated slag;
grinding the granulated slag to obtain slag powder;
and mixing the slag powder and the silicate cement clinker to obtain the slag cement.
In the present invention, a flow chart of a slag cement production process is shown in FIG. 6, and a detailed description is given of the slag cement production method of the present invention with reference to FIG. 6.
The invention mixes the stainless steel pickling sludge, the molten blast furnace slag and the modifier to obtain the slag. In the invention, the stainless steel pickling sludge is pickling sludge generated by using sulfuric acid as a pickling medium in a stainless steel production enterprise. In the present invention, the composition of the stainless steel pickling sludge preferably includes CaSO4 45～60wt％，Fe2O3 20～35wt％，Cr2O3 1～6wt％，SiO 22 to 3 wt%. In the present invention, the composition of the stainless steel pickling sludge more preferably includes CaSO4 55～60wt％，Fe2O3 25～30wt％，Cr2O3 1～3wt％，SiO 2 2～3wt％。
In the present invention, the water content of the stainless steel pickling sludge is preferably 5 wt% or less, and more preferably 2 wt%. In the present invention, the slag is prepared at a high temperature, and if the moisture content is high, splashing, even explosion, may occur after pyrolysis at a high temperature, so the water content of the stainless steel pickling sludge is controlled within the above range.
In the invention, the stainless steel pickling sludge is preferably obtained by drying original stainless steel pickling sludge. In the invention, the water content of the original stainless steel pickling sludge is 10-55%. In the invention, the drying temperature is preferably 300-500 ℃, and more preferably 400 ℃; the drying time is preferably 2-4 h, and more preferably 3 h.
In the invention, the temperature of the molten blast furnace slag is preferably 1400-1450 ℃. In the invention, the molten blast furnace slag is high-temperature liquid slag after the blast furnace is tapped. In the present invention, the MgO content in the molten blast furnace slag is preferably 1 to 8% by mass. The temperature range of the molten blast furnace slag is controlled to be 1400-1450 ℃, and the temperature can be controlledThe fluidity of the slag is ensured, the temperature is the lower limit of the decomposition temperature of the sulfide, the decomposition is hindered under the mixed flushing of the slag, and SO is avoided2The gas escapes in large quantities.
In the invention, the total amount of the stainless steel pickling sludge is 1-10 wt%, more preferably 5-8 wt% of the molten blast furnace slag.
In the present invention, the modifier is preferably a siliceous modifier; the siliceous modifier preferably comprises one or two of fly ash and waste glass; in the present invention, the total addition amount of the modifier is preferably 1 to 5 wt%, more preferably 3 to 4 wt% of the molten blast furnace slag. The modifier can promote more glass phases to be generated.
In the invention, the time for mixing the stainless steel pickling sludge, the molten blast furnace slag and the modifier is preferably 3-10 min, and more preferably 4-6 min.
In the present invention, it is preferable that the stainless steel pickling sludge and the modifying agent are thrown into the molten blast furnace slag in multiple portions, respectively.
The invention utilizes the composition characteristics and physical sensible heat of the blast furnace slag to the utmost extent, the stainless steel acid-washing sludge is consumed and processed in a molten state, the added siliceous modifier can enable more glass phases in the granulated slag to be formed, and the MgO in the blast furnace slag can enable the Cr element in the granulated slag to form MgCr2O4And (4) phase(s).
After the molten slag is obtained, the invention carries out cold quenching on the molten slag to obtain the granulated slag. In the invention, the cooling rate of the cold quenching is preferably 300-500 ℃/min, and more preferably 350-400 ℃. The invention controls higher cooling rate, and utilizes high-pressure water quenching to ensure that more than 99 percent of granulated slag is glass phase, thereby ensuring the activity and stability of the granulated slag.
In the present invention, MgCr is contained in the slag2O4The phase and a very small amount of Cr element which is not combined with MgO uniformly exist in the glass phase of the water-quenched slag after rapid cold quenching.
After the granulated slag is obtained, the granulated slag is ground to obtain slag powder. In the present invention, the particle size of the slag powder is preferably less than 0.1 mm; the specific surface area of the slag powder is preferably 500m2/kg or more, more preferably 600m2In terms of/kg. The invention grinds the granulated slag into slag powder, which has the function of exciting stronger hydration activity and is used as a filling material.
After the slag powder is obtained, the slag powder and the silicate cement clinker are mixed to obtain the slag cement. In the invention, the mass ratio of the slag powder to the portland cement clinker is preferably 40-50: 50-60.
The technical solution of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope 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.
Example 1 laboratory test
Drying the original stainless steel pickling sludge with higher water content at 400 ℃ for 2h to obtain stainless steel pickling sludge with 1% water content for later use;
the modifier is fly ash;
uniformly mixing 10g of the stainless steel acid-washing sludge, 3g of a modifier and 100g of blast furnace slag, and placing the mixture in a porcelain boat;
and (3) placing the porcelain boat in a horizontal resistance furnace, heating to 1450 ℃ at the speed of 5 ℃/min, and preserving the temperature for 5min to obtain the molten slag.
Rapidly pulling the porcelain boat out of a high-temperature area, and performing water quenching at a cooling rate of 400 ℃/min to obtain granulated slag;
slag powder (the specific surface area is 689 m) obtained by grinding the granulated slag2/kg) and portland cement clinker are mixed according to the mass ratio of 1:1 to obtain slag cement.
Example 2
The method was substantially the same as in example 1, except that the amount of the stainless steel pickling sludge was adjusted from "10 g" to "5 g".
Test example 1
An SEM image of the granulated slag prepared in example 1 is shown in fig. 1, in which fig. 1, white fine particles are a magnesium chromium spinel phase, and other surrounding phases are a glass phase.
The SEM-EDS photograph of magnesia-chrome spinel phase at high magnification of the granulated slag prepared in example 1 is shown in FIG. 2. In fig. 2, the white particles at 5K × high magnification are magnesium chromium spinel phases.
FIG. 3 is an EDS profile scan of FIG. 2, wherein the particulate material in FIG. 3 is predominantly the Mg-Cr spinel phase, with particles having an average size of 5 μm. .
The XRD patterns of the granulated slag prepared in examples 1 and 2 are shown in fig. 4. As can be seen from fig. 4, the stainless steel pickling sludge added in the blast furnace slag in 5% and 10% has a main phase of glass phase, which accounts for 99% and 99.5%, respectively, and only a very small amount of gehlenite phase is generated. The slag powder has high potential activity, and can generate hydraulic hard gelling reaction after being mixed with portland cement clinker to prepare slag cement.
Test example 2
The slag cement prepared in example 1 was mixed with standard sand in a ratio of 1: and 3, fully stirring and mixing the mixture with the water-cement ratio of 0.5, filling the mixture into a steel grinding tool with the size of 40 multiplied by 160mm, standing the mixture for 24 hours, demolding the mixture, and curing the prepared cement block in a standard curing box for 28 days to obtain a cement sample.
The graph of the comparison of the compressive strength of the normal blast furnace granulated slag and the sludge-added granulated slag after 28 days of hydration is shown in FIG. 5. As can be seen from fig. 5, slag cement was prepared using two different types of blast furnace granulated slag: the comparison of the compressive strength of the blast furnace granulated slag cement prepared from the industrial blast furnace slag and the slag cement prepared from the granulated slag after 28 days of hydration is higher than the testing standard of the cement strength of 42.5 MPa.
Test example 3
The cement samples obtained in the embodiments 1-2 are prepared according to the method of the test example 2, then the cement samples are ground to be less than 0.074mm, and the Cr element leaching concentration is tested according to the national standard solid waste leaching toxicity leaching method (HJ 557-2010). The Cr leaching concentration of the cement slurry of the slag cement prepared by the invention after being hydrated for 28 days is 0.014mg/L which is far lower than the standard value of 0.2mg/L of Cr leaching in the sintering clinker specified in GB 30760-2014.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A method for treating stainless steel pickling sludge and preparing slag cement comprises the following steps:
mixing the stainless steel pickling sludge, the molten blast furnace slag and a modifier to obtain molten slag;
performing cold quenching on the molten slag to obtain granulated slag;
grinding the granulated slag to obtain slag powder;
and mixing the slag powder and the silicate cement clinker to obtain the slag cement.
2. The method of claim 1, wherein the stainless steel pickling sludge has a water content of less than 5 wt%.
3. The method according to claim 2, wherein the total amount of the stainless steel pickling sludge is 1 to 10 wt% of the molten blast furnace slag.
4. The method according to claim 1, wherein the temperature of the molten blast furnace slag is 1400 to 1450 ℃.
5. The method according to claim 1 or 4, wherein the mixing time of the stainless steel pickling sludge, the molten blast furnace slag and the modifier is 3-10 min.
6. The method of claim 1, wherein the cooling rate of the cold quenching is 300 to 500 ℃/min.
7. The method according to claim 1, characterized in that the particle size of the slag powder is less than 0.1 mm; the specific surface area of the slag powder is 500m2Over/kg。
8. The method according to claim 1, wherein the mass ratio of the slag powder to the portland cement clinker is 40-50: 50-60.
9. The method of claim 1, wherein the modifier is a siliceous modifier; the total addition amount of the modifier is 1-5 wt% of the molten blast furnace slag.
10. The method according to claim 1, wherein the stainless steel pickling sludge is pickling sludge produced by stainless steel production enterprises by using sulfuric acid as a pickling medium; the stainless steel pickling sludge comprises CaSO445～60wt％，Fe2O320～35wt％，Cr2O31～6wt％，SiO22～3wt％。
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Cited By (1)
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| CN115745528A (en) * | 2022-10-19 | 2023-03-07 | 浙江永坚新材料科技股份有限公司 | High-performance concrete for thin-wall hollow pier of bridge in plateau area and preparation method thereof |
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