CN110436807A - A kind of processing method of steel slag surface stabilization - Google Patents
A kind of processing method of steel slag surface stabilization Download PDFInfo
- Publication number
- CN110436807A CN110436807A CN201910777875.5A CN201910777875A CN110436807A CN 110436807 A CN110436807 A CN 110436807A CN 201910777875 A CN201910777875 A CN 201910777875A CN 110436807 A CN110436807 A CN 110436807A
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- Prior art keywords
- steel slag
- solution
- reaction
- processing method
- surface modification
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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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/14—Waste materials; Refuse from metallurgical processes
- C04B18/141—Slags
- C04B18/142—Steelmaking slags, converter slags
-
- 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
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/02—Treatment
- C04B20/023—Chemical treatment
-
- 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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Civil Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The present invention relates to steelmaking slag process field more particularly to a kind of processing methods of steel slag surface stabilization.Steel slag is put into carry out surface modification reaction in reaction solution first by the processing method of steel slag surface stabilization designed by the present invention, and reaction solution is the NaHCO of saturation3The KHCO of solution or saturation3Steel slag is filtered out after surface modification reaction, obtains the steel slag product of surface-stable after drying by solution.The reaction condition of the processing method of steel slag surface stabilization of the present invention is mild, low processing cost.
Description
Technical field
The present invention relates to steelmaking slag process field more particularly to a kind of processing methods of steel slag surface stabilization.
Background technique
Iron and Steel Enterprises in China generates steel slag every year and exceedes 100,000,000 tons, and efficient resource utilization rate is less than 30%, a lot of steel slag heap
Product such as mountain, land occupation pollute environment.Steel slag forms a large amount of irregular shapes after being crushed, selecting the processes such as iron, screening to handle
The granule materials of shape.Wherein the part of certain size specification, which can be used as to gather materials, substitutes rubble or cobble use.But in steel slag
There are certain f-CaO, C3S, C2The mineral facies such as S generate C-S-H gel and Ca (OH) after this substance aquation2, Ca (OH)2It is molten
Solution will cause rainwater pH raising in rainwater, cause corrosive pipeline and environmental pollution.
Currently, generally using steel slag carbonization technology to steel slag surface stabilizing treatment, steel slag carbonization technology is to utilize CO2With
Alkaline matter in steel slag reacts and it is made to be converted into CaCO3Method.Steel slag carbonisation is generally required in closed appearance
In device, in certain C O2It is carried out under conditions of pressure, to reach higher carbonation rate.If publication No. is in CN106145878A
State's invention patent application document, wherein disclosing a kind of CO2Mineralising prepared from steel slag is for light building material and preparation method thereof, by steel slag
It is formed together with expanded perlite and water after broken, after test piece maintenance one day, test specimen is transferred in kettle and carries out carbonized maintaining, and is protected
Hold certain CO2Pressure, carburizing temperature and carbonization time etc., finally can be obtained light building material.For another example, Gao Xiaojiao et al. has studied
The carbonisation of steel slag, is respectively handled test specimen using different carburizing temperature and carbonization time, and grind under the conditions of pressure is steamed
Carbonized product property and best Carbonization Conditions are studied carefully.Above method mainly utilizes CO2To wholly or largely basic species in steel slag
Matter is reacted, and processing cost is high.Steel slag substitutes rubble or cobble uses open market valence within hundred yuan as gathering materials, no
High cost, high carbonation rate method is preferably used to be handled.
Summary of the invention
In order to solve problem above, the object of the present invention is to provide a kind of processing of low-cost steel slag surface stabilization
Method.
To achieve the above object, the processing method of the steel slag surface stabilization designed by the present invention, first puts into steel slag
Surface modification reaction is carried out into reaction solution, reaction solution is the NaHCO of saturation3The KHCO of solution or saturation3Solution, surface are modified
Steel slag is filtered out after reaction, obtains the steel slag product of surface-stable after drying.
Preferably, it after surface modification reaction, collects filtrate and carries out intermediate regenerative response in reactor,
Detailed process is that CO is passed through into filtrate2Gas is 8~9 up to the pH value of filtrate, the filtrate after being regenerated.
Preferably, by the filtrate recycle after regeneration in the surface modification reaction of steel slag.
Preferably, the temperature of the surface modification reaction is 20~60 DEG C, and the time is 0.5~4h, steel slag and anti-
The mass ratio for answering liquid is 1:3~1:6.
The present invention has the advantages that
(1) present invention releases Ca (OH) using steel slag Xiang Shuizhong2Characteristic, utilize NaHCO3Or KHCO3As centre
Body, provides carbon source, and steel slag surface releases Ca (OH)2Afterwards, with the NaHCO in solution3Or KHCO3Reaction rapidly generates CaCO3
It is not soluble in water, it is attached to coarse steel slag particle surface immediately, forms protective film, avoids Ca (OH)2Further dissolution, thus
Obtain surface stabilization steel slag；Na after reaction2CO3Or K2CO3Solution utilizes CO2It is regenerated as NaHCO3Or KHCO3Solution, and lead to
It crosses pH value monitoring and adjusts regenerative response process.
(2) present invention gained surface stabilization steel slag as open gradation base compared with natural rubble, cobble, in porosity
And in terms of rainwater storage ability quite, but it is inexpensive in natural rubble, metallurgy solid waste substitution of resources natural rubble, ovum can be used
The natural resources such as stone are realized and save natural resources consumption while solid waste consumption utilizes.
(3) compared with existing steel slag is carbonized technology, reaction condition of the present invention is mild, only handles steel slag surface, keeps away
Having exempted from excessive carbonization causes waste and processing cost to improve.
(4) the obtained surface stabilization steel slag of the present invention has certain gradation, can be used as filler substitution rubble or ovum
Stone is used for sponge urban construction medium stone base or surface protection against erosion coating, and for rainwater mass rate of emission of regulating and storing, realization is avoided the peak hour
Discharge, or the effects of alleviation rain drop erosion.
Detailed description of the invention
Fig. 1 is the flow chart of the processing method of steel slag surface stabilization of the present invention.
Specific embodiment
For a better understanding of the invention, invention is described in detail below with reference to drawings and concrete examples.
Embodiment 1
As shown in connection with fig. 1, the processing method of the steel slag surface stabilization of the present embodiment, comprising steps of
(1) select that partial size after iron is 5~25mm and the steel slag that cleans up is placed in first reactor for broken；
(2) saturation NaHCO is added into first reactor3Solution carries out surface modification reaction, control steel slag and saturation
NaHCO3Mass ratio be 1:3；
(3) temperature of surface modification reaction is 40 DEG C, time 2h；During surface modification reaction, NaHCO is utilized3Make
For intermediate, carbon source is provided, steel slag surface releases Ca (OH)2Afterwards, with the NaHCO in solution3Reaction rapidly generates CaCO3No
It is dissolved in water, is attached to coarse steel slag particle surface immediately, protective film is formed, avoids Ca (OH)2Further dissolution, thus
To surface stabilization steel slag；NaHCO in solution3The bigger Na of solubility is generated after reaction2CO3, it is dissolved in solution；
The reaction that surface modification reaction is related to are as follows: Ca (OH)2+2NaHCO3=CaCO3+Na2CO3+H2O；
(4) after surface modification reaction, the steel slag in first reactor is filtered out, the surface-stable obtained after dry
Steel slag product, the steel slag product of surface-stable can be used as crushed rock filler and apply in sponge city medium stone base or surface protection against erosion
In the construction of coating；
(5) after surface modification reaction, filtrate is collected in progress intermediate regenerative response in second reactor, specifically
Process is that CO is passed through into filtrate2Gas, duration of ventilation about 20mins or so, pH value are reduced to 8.0, terminate ventilation；After reaction
The Na isolated2CO3Solution is passed through CO into solution2, renewable is NaHCO3Solution, and monitored by pH value and adjust regeneration instead
Answer process；The reaction that intermediate regenerative response is related to is Na2CO3+CO2+H2O=2NaHCO3；
(6) filtrate recycle obtained after intermediate regenerative response realizes NaHCO in surface modification reaction3It recycles,
Further decrease processing cost.
Embodiment 2
As shown in connection with fig. 1, the processing method of the steel slag surface stabilization of the present embodiment, comprising steps of
(1) select that partial size after iron is 5~25mm and the steel slag that cleans up is placed in first reactor for broken；
(2) saturation KHCO is added into first reactor3Solution carries out surface modification reaction, control steel slag and saturation KHCO3
Mass ratio be 1:6；
(3) temperature of surface modification reaction is 40 DEG C, time 1h；During surface modification reaction, KHCO is utilized3As
Intermediate, provides carbon source, and steel slag surface releases Ca (OH)2Afterwards, with the KHCO in solution3Reaction rapidly generates CaCO3It is insoluble
Yu Shui is attached to coarse steel slag particle surface immediately, forms protective film, avoids Ca (OH)2Further dissolution, to obtain
Surface stabilization steel slag；KHCO in solution3The bigger K of solubility is generated after reaction2CO3, it is dissolved in solution；
The reaction that surface modification reaction is related to are as follows: Ca (OH)2+2KHCO3=CaCO3+K2CO3+H2O；
(4) after surface modification reaction, the steel slag in first reactor is filtered out, the surface-stable obtained after dry
Steel slag product, the steel slag product of surface-stable can be used as crushed rock filler and apply in sponge city medium stone base or surface protection against erosion
In the construction of coating；
(5) after surface modification reaction, filtrate is collected in progress intermediate regenerative response in second reactor, specifically
Process is that CO is passed through into filtrate2Gas, duration of ventilation about 30mins or so, pH value are reduced to 8.5, terminate ventilation；After reaction
The K isolated2CO3Solution is passed through CO into solution2, renewable is KHCO3Solution, and monitored by pH value and adjust regenerative response
Process；The reaction that intermediate regenerative response is related to is K2CO3+CO2+H2O=2KHCO3；
(6) filtrate recycle obtained after intermediate regenerative response realizes KHCO in surface modification reaction3It recycles,
Further decrease processing cost.
Embodiment 3
As shown in connection with fig. 1, the processing method of the steel slag surface stabilization of the present embodiment, comprising steps of
(1) select that partial size after iron is 5~25mm and the steel slag that cleans up is placed in first reactor for broken；
(2) saturation NaHCO is added into first reactor3Solution carries out surface modification reaction, control steel slag and saturation
NaHCO3Mass ratio be 1:5；
(3) temperature of surface modification reaction is 40 DEG C, time 2h；
(4) after surface modification reaction, the steel slag in first reactor is filtered out, the surface-stable obtained after dry
Steel slag product, the steel slag product of surface-stable can be used as crushed rock filler and apply in sponge city medium stone base or surface protection against erosion
In the construction of coating；
(5) after surface modification reaction, filtrate is collected in progress intermediate regenerative response in second reactor, specifically
Process is that CO is passed through into filtrate2Gas, duration of ventilation about 20mins or so, pH value are reduced to 9, terminate ventilation；
(6) filtrate recycle obtained after intermediate regenerative response realizes NaHCO in surface modification reaction3It recycles,
Further decrease processing cost.
The common steel slag of 100g and the steel slag after 1 surface stabilizing treatment of embodiment are respectively placed in 1000mL distilled water
In, it is sealed, at regular intervals afterwards with the pH value of pH meter measurement solution, the results are shown in Table 1.
Table 1
It can be seen from Table 1 that steel slag discharges Ca (OH) into solution after surface stabilizing treatment2Ability obviously drops
It is low, show that the processing method of steel slag surface stabilization of the invention can be substantially reduced steel slag particle surface alkalinty, is effectively prevented from
Alkaline matter is extracted into water body in particle.
The embodiments described above only express several embodiments of the present invention, and the description thereof is more specific and detailed, but simultaneously
Limitations on the scope of the patent of the present invention therefore cannot be interpreted as.It should be pointed out that for those of ordinary skill in the art
For, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to guarantor of the invention
Protect range.Therefore, the scope of protection of the patent of the invention shall be subject to the appended claims.
Claims (4)
1. a kind of processing method of steel slag surface stabilization, steel slag is put into surface modification reaction is carried out in reaction solution first,
Reaction solution is the NaHCO of saturation3The KHCO of solution or saturation3Solution filters out steel slag after surface modification reaction, through drying
The steel slag product of surface-stable is obtained afterwards.
2. the processing method of steel slag surface stabilization according to claim 1, which is characterized in that surface modification reaction terminates
Afterwards, it collects filtrate and carries out intermediate regenerative response in reactor, detailed process is to be passed through CO into filtrate2Gas is until filter
The pH value of liquid is 8~9, the filtrate after being regenerated.
3. the processing method of steel slag surface stabilization according to claim 2, which is characterized in that return the filtrate after regeneration
For in the surface modification reaction of steel slag.
4. the processing method of steel slag surface stabilization according to claim 1, which is characterized in that the temperature of surface modification reaction
Degree is 20~60 DEG C, and the time is 0.5~4h, and the mass ratio of steel slag and reaction solution is 1:3~1:6.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111718161A (en) * | 2020-07-03 | 2020-09-29 | 苏州工业园区园林绿化工程有限公司 | Concrete with multiple doped steel wastes |
| CN115572104A (en) * | 2022-11-07 | 2023-01-06 | 山东京韵泰博新材料科技有限公司 | In-situ generated fiber reinforced artificial stone and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN115572104A (en) * | 2022-11-07 | 2023-01-06 | 山东京韵泰博新材料科技有限公司 | In-situ generated fiber reinforced artificial stone and preparation method thereof |
| CN115572104B (en) * | 2022-11-07 | 2024-05-17 | 山东京韵泰博负碳科技有限公司 | In-situ generated fiber reinforced artificial stone and preparation method thereof |
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