CN103992054A - Carbonated steel slag aggregate and preparation method thereof - Google Patents
Carbonated steel slag aggregate and preparation method thereof Download PDFInfo
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- CN103992054A CN103992054A CN201410059617.0A CN201410059617A CN103992054A CN 103992054 A CN103992054 A CN 103992054A CN 201410059617 A CN201410059617 A CN 201410059617A CN 103992054 A CN103992054 A CN 103992054A
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- steel slag
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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
- 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
Abstract
The invention discloses a carbonated steel slag aggregate and a preparation method thereof. The method comprises the following steps: sieving steel slag subjected to iron separation, taking particles with size between 0.5-25 mm particle for high pressure water flushing, and naturally drying the particles; immersing the dried steel slag particles in a mixed solution of 20-300 g/L caustic soda and 60-300 g/L sodium carbonate for 24 h, and maintaining the temperature at 20-60 DEG C; draining the soaked steel slag particles, immediately placing the particles in a sealed carbonation reactor, and introducing CO2 gas with purity over 99.9% for curing at the temperature of 70-90 DEG C for 0.5 h, and with the CO2 gas pressure at 0.2-0.5 MPa; cooling the steel slag particles subjected to carbonation treatment under natural conditions to room temperature, so as to obtain the carbonated steel slag aggregate. The steel slag aggregate treated by the method has compact surface structure to reduce water for concrete mixing; free magnesium oxide and free calcium oxide are conversed into carbonate precipitation to eliminate the hidden trouble of adverse stability; CO2 can be stored stably; the amount of natural aggregate is reduced to save nonrenewable resources; and the method has easily available raw materials and simple process.
Description
Technical field
The present invention relates to a kind of carbonatation steel scoria aggregate and preparation method thereof, belong to solid waste and process reutilization technology field.
Background technology
Although the natural aggregate resource distribution of China is comparatively extensive, because annual Concrete Industry at least consumes 3,600,000,000 tons of natural sandstones, there is the phenomenon that building stones resource is hard to carry on.Meanwhile, a large amount of exploitations of lithotome cause original landforms and vegetal cover damage layer, and soil erosion and natural landscape worsen, and have a strong impact on social Sustainable development.Therefore, finding novel material replacement natural aggregate is one of effective way changing this present situation.
China's slag that at present accumulative total is stored up, up to 500,000,000 tons, not only takies a large amount of arable lands, and expose to the sun and rain and weathering after, the water and soil environment of heavy metal ion or objectionable impurities severe contamination periphery, even harm humans is healthy.Therefore, be necessary to find the comprehensive utilization ratio that practicable mode improves slag, bring into play its economy of resources, wherein making slag aggregate is one of Processes For Effective Conversion.But, although it is high to have experienced the slag hardness of 1650 ℃ of high temperature, because overflowing the top layer vesicular structure causing, volatiles has a strong impact on concrete mixing water consumption, and higher its stability that affects of free Mg content, therefore, can not directly be used as aggregate.
In view of above situation, this patent provides a kind of carbonatation steel scoria aggregate and preparation method thereof, first by alkali, destroy its vitreous structure, improve the hydration activity of tricalcium silicate and Dicalcium Phosphate (Feed Grade), then carry out carbonating maintenance, not only improve slag aggregate performance, turn waste into wealth, save Nonrenewable resources, and can store CO by stable curing
2, alleviate environment and society's load.
Summary of the invention
The object of the present invention is to provide a kind of carbonatation steel scoria aggregate and preparation method thereof, the slag aggregate obtaining with the method processing is under the synergy of alkali erosion and carbonating, a large amount of carbonate products and hydrated product filling pore, improve surface structure density, reduce concrete mixing water consumption, free magnesium and free calcium oxide change carbonate into simultaneously, eliminate the bad hidden danger of stability.
Technical scheme of the present invention is as follows:
1, a kind of carbonatation steel scoria aggregate and preparation method thereof, is characterized in that comprising following treatment step:
(1) will select the slag after iron to sieve, get particle diameter between the particle high pressure water washing of 0.5 ~ 25mm, naturally dry;
(2) by the steel slag particle drying, the mixing solutions at 20 ~ 300g/L caustic soda and 60 ~ 300g/L soda ash soaks 24 hours, and temperature maintains 20 ~ 60 ℃;
(3) steel slag particle after soaking is drained away the water, put into immediately the carburizing reagent still of sealing, and pass into purity and reach 99.9% CO
2gas maintenance, curing temperature is 70 ~ 90 ℃, curing time is 0.5 hour, CO
2gaseous tension is 0.2 ~ 0.5MPa;
(4) steel slag particle of carbonating being processed naturally cools to room temperature, obtains carbonatation steel scoria aggregate.
Caustic soda of the present invention, its main component is sodium hydroxide, content approximately 96%; Described soda ash, its main component is sodium carbonate, content approximately 99%.
Outstanding advantages of the present invention is:
(1) the slag aggregate surface structure that this invention provides is fine and close, reduces concrete mixing water consumption, and free magnesium and free calcium oxide change carbonate into simultaneously, eliminates the bad hidden danger of stability;
(2) energy stable curing of the present invention stores CO
2, reduce the harm that greenhouse gases cause to environment for human survival;
(3) industrial residue slag is turned waste into wealth, alleviate environment and society's load, reduced natural aggregate consumption, saved Nonrenewable resources resource;
(4) raw material is easy to get, and technique is simple.
Embodiment
Embodiment 1
(1) will select the slag after iron to sieve, get particle diameter between the particle high pressure water washing of 0.5 ~ 25mm, naturally dry;
(2) by the steel slag particle drying, the mixing solutions at 50g/L caustic soda and 80g/L soda ash soaks 24 hours, and temperature maintains 25 ℃;
(3) steel slag particle after soaking is drained away the water, put into immediately the carburizing reagent still of sealing, and pass into purity and reach 99.9% CO
2gas maintenance, curing temperature is 75 ℃, curing time is 0.5 hour, CO
2gaseous tension is 0.28MPa;
(4) steel slag particle of carbonating being processed naturally cools to room temperature, obtains carbonatation steel scoria aggregate.
The crush index that records slag aggregate according to GB/T14685-2011 < < cobble for building, rubble > > is 14%, and water-intake rate is 1.78%.With slag aggregate, replace 50% natural aggregate, according to GB/T50107-2010 < < Standard for inspection and assessment of strength of concrete > >, record 28 days concrete crushing strengths and reach C30 requirement.
Embodiment 2
(1) will select the slag after iron to sieve, get particle diameter between the particle high pressure water washing of 0.5 ~ 25mm, naturally dry;
(2) by the steel slag particle drying, the mixing solutions at 100g/L caustic soda and 120g/L soda ash soaks 24 hours, and temperature maintains 40 ℃;
(3) steel slag particle after soaking is drained away the water, put into immediately the carburizing reagent still of sealing, and pass into purity and reach 99.9% CO
2gas maintenance, curing temperature is 80 ℃, curing time is 0.5 hour, CO
2gaseous tension is 0.32MPa;
(4) steel slag particle of carbonating being processed naturally cools to room temperature, obtains carbonatation steel scoria aggregate.
The crush index that records slag aggregate according to GB/T14685-2011 < < cobble for building, rubble > > is 12%, and water-intake rate is 1.52%.With slag aggregate, replace 50% natural aggregate, according to GB/T50107-2010 < < Standard for inspection and assessment of strength of concrete > >, record 28 days concrete crushing strengths and reach C30 requirement.
Embodiment 3
(1) will select the slag after iron to sieve, get particle diameter between the particle high pressure water washing of 0.5 ~ 25mm, naturally dry;
(2) by the steel slag particle drying, the mixing solutions at 200g/L caustic soda and 240g/L soda ash soaks 24 hours, and temperature maintains 50 ℃;
(3) steel slag particle after soaking is drained away the water, put into immediately the carburizing reagent still of sealing, and pass into purity and reach 99.9% CO
2gas maintenance, curing temperature is 85 ℃, curing time is 0.5 hour, CO
2gaseous tension is 0.40MPa;
(4) steel slag particle of carbonating being processed naturally cools to room temperature, obtains carbonatation steel scoria aggregate.
The crush index that records slag aggregate according to GB/T14685-2011 < < cobble for building, rubble > > is 12%, and water-intake rate is 1.40%.With slag aggregate, replace 50% natural aggregate, according to GB/T50107-2010 < < Standard for inspection and assessment of strength of concrete > >, record 28 days concrete crushing strengths and reach C30 requirement.
Reference examples 1:
The crush index that records natural aggregate according to GB/T14685-2011 < < cobble for building, rubble > > is 9%, and water-intake rate is 1.12%.With 100% natural aggregate, according to GB/T50107-2010 < < Standard for inspection and assessment of strength of concrete > >, record 28 days concrete crushing strengths and reach C35 requirement.
Reference examples 2:
(1) will select the slag after iron to sieve, get particle diameter between the particle high pressure water washing of 0.5 ~ 25mm, naturally dry;
(2) crush index that records slag according to GB/T14685-2011 < < cobble for building, rubble > > is 22%, and water-intake rate is 19.78%.With 100% slag, according to GB/T50107-2010 < < Standard for inspection and assessment of strength of concrete > >, record 28 days concrete crushing strengths and just reached C10 requirement.
Claims (3)
1. carbonatation steel scoria aggregate and preparation method thereof, is characterized in that comprising following treatment step:
(1) will select the slag after iron to sieve, get particle diameter between the particle high pressure water washing of 0.5 ~ 25mm, naturally dry;
(2) by the steel slag particle drying, the mixing solutions at 20 ~ 300g/L caustic soda and 60 ~ 300g/L soda ash soaks 24 hours, and temperature maintains 20 ~ 60 ℃;
(3) steel slag particle after soaking is drained away the water, put into immediately the carburizing reagent still of sealing, and pass into purity and reach 99.9% CO
2gas maintenance, curing temperature is 70 ~ 90 ℃, curing time is 0.5 hour, CO
2gaseous tension is 0.2 ~ 0.5MPa;
(4) steel slag particle of carbonating being processed naturally cools to room temperature, obtains carbonatation steel scoria aggregate.
2. caustic soda as claimed in claim 1, its main component is sodium hydroxide, content approximately 96%.
3. soda ash as claimed in claim 1, its main component is sodium carbonate, content approximately 99%.
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| CN201410059617.0A CN103992054A (en) | 2014-02-23 | 2014-02-23 | Carbonated steel slag aggregate and preparation method thereof |
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106795053A (en) * | 2014-08-29 | 2017-05-31 | 雷科维尔比利时公司 | Method for producing the moulded product of carbonate bonding |
| CN106746814A (en) * | 2016-12-16 | 2017-05-31 | 济南大学 | A kind of slag aggregate processing method |
| CN108558351A (en) * | 2018-06-13 | 2018-09-21 | 大连理工大学 | A kind of low alkali plant-growing concrete building block and preparation method thereof for making aggregate with artificial carbonization slag bead |
| CN108609882A (en) * | 2018-05-30 | 2018-10-02 | 武汉理工大学 | A kind of slag as aggregate stability modification method |
| CN109279846A (en) * | 2018-09-25 | 2019-01-29 | 济南大学 | A kind of high-impermeable concrete and preparation method thereof |
| CN109320290A (en) * | 2018-11-02 | 2019-02-12 | 山西大学 | A kind of processing method of concrete prefabricated product enhancing carbon sequestration |
| CN109896825A (en) * | 2019-04-09 | 2019-06-18 | 辽宁科大中驰镁建材科技有限公司 | A kind of compound alkali formula magnesium cement constructional material of steel slag and preparation method thereof |
| JP2020132457A (en) * | 2019-02-15 | 2020-08-31 | Ｊｆｅミネラル株式会社 | Aging method of slug, manufacturing method of civil engineering material, and carbonation accelerator for aging treatment of slug |
| JP2020132456A (en) * | 2019-02-15 | 2020-08-31 | Ｊｆｅミネラル株式会社 | Aging method of slug, manufacturing method of civil engineering material, and hydration accelerator for aging treatment of slug |
| CN112299733A (en) * | 2020-10-20 | 2021-02-02 | 徐州成瑞建筑科技研究院有限公司 | Method for stably and safely eliminating poor stability of hot splashing steel slag aggregate by acid washing and cleaning system |
| CN112430051A (en) * | 2020-11-30 | 2021-03-02 | 山西大学 | Building material prepared by synergistic carbonization of steel slag, desulfurized gypsum and fly ash and method |
| CN113135682A (en) * | 2020-01-19 | 2021-07-20 | 长江水利委员会长江科学院 | Method for improving stability of roller steel slag fine aggregate |
| CN113929334A (en) * | 2021-11-24 | 2022-01-14 | 山东大学 | Acidized and carbonized coupling modified steel slag and preparation process and application thereof |
| CN114031365A (en) * | 2021-11-30 | 2022-02-11 | 大连理工大学 | Method for improving stability of steel slag and regulating and controlling performance of steel slag building material product based on acid-base excitation |
| CN114804668A (en) * | 2022-05-27 | 2022-07-29 | 山东汉博昱洲新材料有限公司 | Preparation method of activated carbon-fixing material for producing recycled aggregate |
| CN114920481A (en) * | 2022-05-16 | 2022-08-19 | 山东竣鸿环保科技有限公司 | Preparation method of modified steel slag mineral admixture, concrete and application |
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| JP2000350976A (en) * | 1999-06-11 | 2000-12-19 | Kawasaki Steel Corp | Method for solidifying granular steel-making slag |
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Cited By (23)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106795053A (en) * | 2014-08-29 | 2017-05-31 | 雷科维尔比利时公司 | Method for producing the moulded product of carbonate bonding |
| CN106746814A (en) * | 2016-12-16 | 2017-05-31 | 济南大学 | A kind of slag aggregate processing method |
| CN108609882B (en) * | 2018-05-30 | 2020-12-08 | 武汉理工大学 | Method for improving stability of steel slag aggregate |
| CN108609882A (en) * | 2018-05-30 | 2018-10-02 | 武汉理工大学 | A kind of slag as aggregate stability modification method |
| CN108558351A (en) * | 2018-06-13 | 2018-09-21 | 大连理工大学 | A kind of low alkali plant-growing concrete building block and preparation method thereof for making aggregate with artificial carbonization slag bead |
| CN109279846A (en) * | 2018-09-25 | 2019-01-29 | 济南大学 | A kind of high-impermeable concrete and preparation method thereof |
| CN109279846B (en) * | 2018-09-25 | 2021-02-09 | 济南大学 | High-impermeability concrete and preparation method thereof |
| CN109320290A (en) * | 2018-11-02 | 2019-02-12 | 山西大学 | A kind of processing method of concrete prefabricated product enhancing carbon sequestration |
| JP7014746B2 (en) | 2019-02-15 | 2022-02-01 | Ｊｆｅミネラル株式会社 | Slag aging method, civil engineering material manufacturing method, and carbonation accelerator for slag aging treatment |
| JP2020132456A (en) * | 2019-02-15 | 2020-08-31 | Ｊｆｅミネラル株式会社 | Aging method of slug, manufacturing method of civil engineering material, and hydration accelerator for aging treatment of slug |
| JP2020132457A (en) * | 2019-02-15 | 2020-08-31 | Ｊｆｅミネラル株式会社 | Aging method of slug, manufacturing method of civil engineering material, and carbonation accelerator for aging treatment of slug |
| JP7053517B2 (en) | 2019-02-15 | 2022-04-12 | Ｊｆｅミネラル株式会社 | Slag aging method, civil engineering material manufacturing method, and hydration accelerator for slag aging treatment |
| CN109896825A (en) * | 2019-04-09 | 2019-06-18 | 辽宁科大中驰镁建材科技有限公司 | A kind of compound alkali formula magnesium cement constructional material of steel slag and preparation method thereof |
| CN113135682B (en) * | 2020-01-19 | 2022-05-17 | 长江水利委员会长江科学院 | Method for improving stability of roller steel slag fine aggregate |
| CN113135682A (en) * | 2020-01-19 | 2021-07-20 | 长江水利委员会长江科学院 | Method for improving stability of roller steel slag fine aggregate |
| CN112299733A (en) * | 2020-10-20 | 2021-02-02 | 徐州成瑞建筑科技研究院有限公司 | Method for stably and safely eliminating poor stability of hot splashing steel slag aggregate by acid washing and cleaning system |
| CN112430051A (en) * | 2020-11-30 | 2021-03-02 | 山西大学 | Building material prepared by synergistic carbonization of steel slag, desulfurized gypsum and fly ash and method |
| CN113929334A (en) * | 2021-11-24 | 2022-01-14 | 山东大学 | Acidized and carbonized coupling modified steel slag and preparation process and application thereof |
| US11572307B1 (en) | 2021-11-24 | 2023-02-07 | Shandong University | Process for modifying steel slag through acidification and carbonization coupling |
| CN114031365A (en) * | 2021-11-30 | 2022-02-11 | 大连理工大学 | Method for improving stability of steel slag and regulating and controlling performance of steel slag building material product based on acid-base excitation |
| CN114920481A (en) * | 2022-05-16 | 2022-08-19 | 山东竣鸿环保科技有限公司 | Preparation method of modified steel slag mineral admixture, concrete and application |
| CN114804668A (en) * | 2022-05-27 | 2022-07-29 | 山东汉博昱洲新材料有限公司 | Preparation method of activated carbon-fixing material for producing recycled aggregate |
| CN114804668B (en) * | 2022-05-27 | 2023-11-03 | 山东京韵泰博负碳科技有限公司 | Preparation method of activated carbon negative material for producing recycled aggregate |
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Application publication date: 20140820 |