CN101033117A - Steel slag treatment additive - Google Patents
Steel slag treatment additive Download PDFInfo
- Publication number
- CN101033117A CN101033117A CN 200610024549 CN200610024549A CN101033117A CN 101033117 A CN101033117 A CN 101033117A CN 200610024549 CN200610024549 CN 200610024549 CN 200610024549 A CN200610024549 A CN 200610024549A CN 101033117 A CN101033117 A CN 101033117A
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- slag
- steel slag
- cao
- treatment additive
- additive
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Abstract
This invention relates to an additive for processing steel slag including: powdered coal ash or cinders 75-100%, blast furnace slag 0-15% and coal 0-10%, in which, the powdered coal ash or coal slag includes: CaO 0-15%, SiO2 40-60% and Al2O3 15-35%, said blast furnace slag includes: CaO 30-45%, SiO2 25-40%, Al2O3 10-20% and MgO 5-15%, and content of fixed carbon is greater than 65%. The additive provided in this invention utilizes the sensible heat of high temperature steel slag after finishing blowing to process the slag of melt state, which can reduce contents of F.CaO and F.MgO in slag and solves the problem that the volume of slag is not stable.
Description
Technical field
The present invention relates to a kind of steel slag treatment additive.
Background technology
At present, under converter process, molten iron and steel scrap add converter, and element oxidations under the oxygen jet effect such as the silicon in the molten iron, manganese, iron and phosphorus form bessemer furnace slag with the calcium oxide (lime) that adds, magnesium oxide slag making materialses such as (light dolomites) through behind the chemical reaction of a series of complexity.Because the restriction of conditions such as mass transfer still has partial oxidation calcium and magnesium oxide to fail to participate in the slag making reaction when finishing blowing, remains in the slag with unbound state.
Studies show that for the slag of relevant industries uses such as building the road, the content that requires free calcium oxide wherein is less than 5%; The slag that relevant industries such as concrete, cement are used, the content that requires free calcium oxide wherein is less than 3%.The free calcium oxide content of the slag of using as DB31/T82-1999 " asphaltic road-mix surface course and roadbase slag " regulation asphaltic road-mix surface course is less than 3.0%, and the free calcium oxide content of the slag that roadbase is used is less than 5.0%.Set forth in the document " engineering utilization of bessemer furnace slag " (bao steel technology 1994/03) as long as the free calcium oxide in the control slag, its content is reduced to below 3%, just can quicken or decompose stable in advance, being used for engineering fills, can guarantee construction quality equally, plant area's environmental protection and greening are also had no adverse effect.
When bessemer furnace slag after finishing blowing, generally contain 5～10% free calcium oxide and a spot of free magnesium.After remaining in the free calcium oxide and magnesium oxide chance water in the slag, can produce following reaction:
CaO+H
2O＝Ca(OH)
2 ①
MgO+H
2O＝Mg(OH)
2 ②
Reaction 1., generation 2. can make the slag volume produce expand, so bessemer furnace slag must pass through digestion process, reduces the content of free calcium oxide and free magnesium, eliminates just can be applied to build the road after its volume unstable and industry such as concrete.
Existing slag treatment process method mainly contains following several:
1, stack naturally: be about to slag and place the slag field, by with atmosphere in moisture and the reactivity of rainwater so that CaO in the slag and MgO produce hydration reaction, it is cleared up.
2, slag adds water treatment: and method 1 is similar, by artificial water spray, makes CaO in the slag and MgO produce hydration reaction and clears up.This processing method is widely adopted at present.
3, slag steam treatment: compare the above-mentioned said water that adds and clear up CaO in the slag and the processing method of MgO, the processing efficiency height of present method, water consumption is few.And, also there has been the high pressure steam slag treatment process (SKAP) of exploitation on this basis, it can make the efficient of clearing up further improve.
4, control the chemical ingredients of converter finishing slag by the control slagging process, reduce the content of the free calcium oxide in the slag with this:
Open among the flat 10-121121 as the spy and to report, control contains CaO, SiO in bessemerizing
2And Al
2O
3The input amount of material is controlled the composition of finishing slag, and is as follows: CaO%/SiO
2% 〉=2.2 and CaO%/(SiO
2%+Al
2O
3%)≤2.0, thus, slag can be eliminated volumetric expansion;
Consider the factor of free magnesium, the spy opens 2001-64714 and further finishing slag is controlled to be by the material input: CaO%/SiO
2% 〉=2.2, CaO%/(SiO
2%+Al
2O
3%)≤2.0,12%≤MgO≤30% and (CaO%+MgO%)/SiO
2% 〉=2.2 are handled back slag water logging rate of expansion and are lower than 1.5%;
In addition, the spy opens among the 2002-212621, and the slag that contains calcium oxide of molten iron or the concise generation of molten steel is added converter as the lime source, and finishing slag is controlled to be (CaO%+SiO
2%)≤80%, 1.0≤CaO%/SiO
2%≤3.8, and in the slag process of cooling 1264 ℃～400 ℃ the time to be higher than the speed cooling of 0.2 ℃/min, the slag water logging swelling property that obtains under this condition is lower than 1.5%.
In above-mentioned all processing methodes, method 1,2 and 3 all is to utilize free calcium oxide and magnesian hydrolysis reaction that slag is cleared up processing.Wherein the processing efficiency of processing method 1 is very low, and slag is not often through still reaching requirement after the stacking more than a year, and occupied ground, produces and pollutes.And in processing method 2 and 3, water or vapor volume are big, influence operating environment, reduce steel construction and crane life-span, and labor condition is poor, and the slag pan life-span is low, to free calcium oxide to clear up processing also not ideal, and waste great amount of water resources.
Though and processing method 4 can be controlled the content of the free calcium oxide in the slag, but because slag making materials is to add in blowing, to have a negative impact to slagging process, and make the slag that causes reduce, and cause erosion converter lining to the ability of removing impurity such as p and s.
In addition, flyash or cinder all are the residues behind the coal combustion.At present, also more to the report of their research and utilizations, wherein be no lack of slag and they are mixed the report of relevant industries such as being applied to building materials production, build the road.After just having inquired into steel-making slag powder and flyash equivalent and replace cement as document " steel-making slag powder and flyash are to the influence characteristic of steel slag concrete mechanical property " (total utilization of PCA 2004/01), the mechanical attribute of steel slag concrete changes characteristics and rule; " utilization of flyash steel slag concrete in pavement of road " (highway 1998/10) set forth the concrete that replaces the sand of 20% cement and 15% to make respectively by flyash and two kinds of industrial residues of slag, can be used for the concrete road surface of the major urban arterial highway and the Class I highway of extra-heavy duty type traffic; What " 10.0MPa slag cinder small-sized hollow building block " (building block and building block building 1999/01) set forth is to utilize the slag cinder to test through multiparty collaboration, has been developed into small-sized hollow building block; Or the like.But the slag that relates in these documents all is through clearing up the slag of processing, discussion be to consolidate the problem of giving up and how to fully utilize with industry such as flyash or cinders through the slag of clearing up after the processing; And, how to avoid free calcium oxide and magnesian existence in the invar slag, the volume instability of bringing is a matter of utmost importance will putting forth effort to solve in these applied researcies at present.
In steel slag utilization research, conclude and get up to have two aspects: the research of first aspect is based on slag through after clearing up processing, and volume is stabile, and promptly the free calcium oxide in the slag is less than 3.0～5.0%; At present, the research of this aspect is very ripe, and the stabile slag high value added utilization of volume is out of question; And the volume stability the problem how research of second aspect non-persistent slag that is exactly volume is used and how solves slag fast; But the progress of this aspect is slow at present, and effect is not very desirable, need put forth effort to solve.
Summary of the invention
The object of the present invention is to provide a kind of steel slag treatment additive, the free calcium oxide in its may command slag and the generation of free magnesium, thus reduced free calcium oxide (F.CaO) and free magnesium (F.MgO) content in the slag finishing slag.
For achieving the above object, the invention provides a kind of steel slag treatment additive, flyash or cinder that it comprises 75～100% also comprise 0～15% blast furnace slag (BF slag) and 0～10% coal;
Described flyash is remaining ash behind the coal combustion, and it comprises 40～60% SiO
2With 15～35% Al
2O
3, also comprise 0～15% CaO;
Described cinder is a remaining residue behind the coal combustion, and it comprises 40～60% SiO
2With 15～35% Al
2O
3, also comprise 0～15% CaO;
Described blast furnace slag is the solid slag that discharges behind the blast furnace ironmaking, and it comprises 30～45% CaO, 25～40% SiO
2, 10～20% Al
2O
3With 5～15% MgO;
Fixed carbon content in the described coal provides the reductive agent carbon (C) of certain content greater than 65% for steel slag treatment additive.
Steel slag treatment additive of the present invention, after mixing by proportioning requirement of the present invention by flyash (or cinder), blast furnace slag and coal, make the particle that granularity is 3～30mm, so neither influence the speed of slag making reaction, can be because of the too little dust pollution that causes of particulate granularity yet.
Steel slag treatment additive provided by the invention, its adding technology have following three kinds:
1, after converter tapping finished, steel slag treatment additive added in the slag in the converter by furnace top bin;
2, after converter tapping finished, slag was poured in the cinder ladle by converter, added steel slag treatment additive by chute in this process;
3, steel slag treatment additive places in the cinder ladle in advance, and after converter tapping finished, slag was directly poured in the cinder ladle.
Use steel slag treatment additive provided by the invention, have the following advantages:
1, steel slag treatment additive provided by the invention is handled slag after finishing blowing, and therefore the ordinary production to converter does not exert an influence.Simultaneously, utilize the sensible heat of high temperature slag, adding in the slag under molten state with flyash, blast furnace slag and coal is that the steel slag treatment additive provided by the invention that raw material is made carries out the pyrochemistry processing to bessemer furnace slag, significantly reduce the content of dissociate in the slag calcium oxide (F.CaO) and free magnesium (F.MgO), fundamentally solved the non-persistent problem of slag volume.
2, processing efficiency height, the steam that produces in the time of also can avoiding adding water and steam treatment causes corrosion to equipment, and contaminate environment, has saved great lot of water resources.
3, main component of the present invention is flyash, blast furnace slag, and these raw material sources are wide, and are cheap, is used for handling the thought of useless resource utilization admittedly that slag has embodied " treatment of wastes with processes of wastes against one another ".
4, in addition, added a spot of coal in the steel slag treatment additive of the present invention, also contain a small amount of uncombined carbon that does not burn down simultaneously in the flyash (or cinder), because carbon has certain reductibility, high temperature adds in the molten steel slag down, can replace the middle part metal element of slagging tap, improve the recovery utilization rate of metal in the dreg element.
Embodiment
Because free calcium oxide is from two aspects in the bessemer furnace slag: lime in the first blowing and light dolomite are failed the dissolved part all the time, are called not molten lime; It two is that slag is in process of cooling, because basicity (CaO%/SiO
2%) higher, 3CaOSiO in the slag
2Free calcium oxide is separated out in phase transformation, is called to separate out lime.Free magnesium oxide then is to derive from the light dolomite that has neither part nor lot in the slag making reaction on a small quantity and the blowing slag to separate out because of the supersaturation of basicity rising rear oxidation magnesium in the slag.
Bessemerize finish steel after, the temperature of slag about about 1600 ℃, is molten state greatly.Utilize slag high temperature sensible heat, add a certain amount of steel slag treatment additive provided by the invention in the slag under molten state and carry out secondary slag making reaction, just can eliminate free calcium oxide and free magnesium in the slag, its chemical equation is:
SiO
2+nCaO＝nCaO·SiO
2 ③
Al
2O
3+mCaO＝mCaO·Al
2O
3 ④
Through reaction 3., 4. after the described slag making reaction, the fusing point of slag can further reduce, and can follow-up residues processing technique not exerted an influence.In addition, allocated a small amount of coal in the steel slag treatment additive into, also contain a small amount of uncombined carbon that does not burn down simultaneously in the flyash (or cinder), because carbon has certain reductibility, high temperature adds in the molten steel slag down, can replace the middle part metal element of slagging tap, improve the recovery utilization rate of metal in the dreg element, its chemical equation is: C+2FeO=2Fe+CO
2
Below, further specify the present invention and advantage of the present invention by 6 specific embodiments:
Table 1 is 6 embodiment of steel slag treatment additive of the present invention, and these 6 embodiment are applied to the slag contrast situation of free calcium oxide and free magnesium content in the slag before and after treatment respectively.
The content of F.CaO and F.MgO in the composition of table 1, each embodiment and the processing front and back slag
Listed embodiment 1 and embodiment 4 in the table 1 adopts first kind of above-mentioned adding technology, promptly after converter tapping finishes, steel slag treatment additive by furnace top bin, added in the slag in the converter.
Listed embodiment 2 and embodiment 6 in the table 1 adopts second kind of above-mentioned adding technology, promptly after converter tapping finishes, adds steel slag treatment additive by chute in slag is poured into process in the cinder ladle by converter.
Listed embodiment 3 and embodiment 5 in the table 1 adopts the third above-mentioned adding technology, is about to steel slag treatment additive and places in advance in the cinder ladle, and after converter tapping finished, slag was directly poured in the cinder ladle.
As shown in Table 1, slag is after steel slag treatment additive of the present invention is handled, the content of free calcium oxide in the slag (F.CaO) and free magnesium (F.MgO) all is reduced to below 5%, thus, slag do not need again through clearing up handle just can be directly used in build the road, industry such as concrete.Technological operation of the present invention is simple, and treatment effect is good, and the processing efficiency height does not produce secondary pollution, has improved the rate of recovery of metals resources, has good promotion and application prospect.
Claims (10)
1. a steel slag treatment additive is characterised in that it comprises: 75～100% flyash; This flyash comprises 40～60% SiO
2With 15～35% Al
2O
3
2. steel slag treatment additive as claimed in claim 1 is characterized in that this additive also comprises 0～15% blast furnace slag; This blast furnace slag comprises 30～45% CaO, 25～40% SiO
2, 10～20% Al
2O
3With 5～15% MgO.
3. steel slag treatment additive as claimed in claim 1 or 2 is characterized in that this additive also comprises 0～10% coal; Fixed carbon content in the described coal is greater than 65%.
4. steel slag treatment additive as claimed in claim 3 is characterized in that described flyash also comprises 0～15% CaO.
5. steel slag treatment additive as claimed in claim 4 is characterized in that, the granularity of described steel slag treatment additive is 3～30mm.
6. a steel slag treatment additive is characterised in that it comprises: 75～100% cinder; This cinder comprises 40～60% SiO
2With 15～35% Al
2O
3
7. steel slag treatment additive as claimed in claim 6 is characterized in that this additive also comprises 0～15% blast furnace slag; This blast furnace slag comprises 30～45% CaO, 25～40% SiO
2, 10～20% Al
2O
3With 5～15% MgO.
8. as claim 6 or 7 described steel slag treatment additives, it is characterized in that this additive also comprises 0～10% coal; Fixed carbon content in the described coal is greater than 65%.
9. steel slag treatment additive as claimed in claim 8 is characterized in that described cinder also comprises 0～15% CaO.
10. steel slag treatment additive as claimed in claim 9 is characterized in that, the granularity of described steel slag treatment additive is 3～30mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200610024549XA CN100534939C (en) | 2006-03-09 | 2006-03-09 | Steel slag treatment additive |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200610024549XA CN100534939C (en) | 2006-03-09 | 2006-03-09 | Steel slag treatment additive |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101033117A true CN101033117A (en) | 2007-09-12 |
| CN100534939C CN100534939C (en) | 2009-09-02 |
Family
ID=38729886
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB200610024549XA Active CN100534939C (en) | 2006-03-09 | 2006-03-09 | Steel slag treatment additive |
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| Country | Link |
|---|---|
| CN (1) | CN100534939C (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101792274A (en) * | 2010-03-19 | 2010-08-04 | 华南理工大学 | Calcium-silicon-aluminum property regulating material for carrying out on-line high-temperature reconstruction on medium-alkalinity steel slag and application thereof |
| CN101555531B (en) * | 2009-05-19 | 2011-04-27 | 华南理工大学 | Method for activating and modifying steel slag by residual heat of converter steel slag |
| CN102399934A (en) * | 2010-09-07 | 2012-04-04 | 鞍钢股份有限公司 | Pre-melting type converter after-furnace slagging agent and manufacturing method thereof |
| CN101638708B (en) * | 2009-07-03 | 2012-05-23 | 王虎 | Slagging process for removing free calcium oxide fCao from converter slag |
| CN102534066A (en) * | 2011-12-13 | 2012-07-04 | 河南科技大学 | High-temperature molten steel slag treating method |
| CN104342524A (en) * | 2014-06-30 | 2015-02-11 | 新疆八一钢铁股份有限公司 | Harmless utilization process of stemming after application of blast furnace |
| CN110407494A (en) * | 2019-05-17 | 2019-11-05 | 江苏瑞沃建设集团有限公司 | A kind of preparation method of the modified steel scoria asphalt with low volume expansion |
| CN114907028A (en) * | 2021-02-10 | 2022-08-16 | 上海梅山钢铁股份有限公司 | Steel slag modifier and method for modifying converter steel slag |
| CN115807138A (en) * | 2022-12-20 | 2023-03-17 | 中冶京诚工程技术有限公司 | Steel slag online treatment system and steel slag online treatment method |
-
2006
- 2006-03-09 CN CNB200610024549XA patent/CN100534939C/en active Active
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101555531B (en) * | 2009-05-19 | 2011-04-27 | 华南理工大学 | Method for activating and modifying steel slag by residual heat of converter steel slag |
| CN101638708B (en) * | 2009-07-03 | 2012-05-23 | 王虎 | Slagging process for removing free calcium oxide fCao from converter slag |
| CN101792274A (en) * | 2010-03-19 | 2010-08-04 | 华南理工大学 | Calcium-silicon-aluminum property regulating material for carrying out on-line high-temperature reconstruction on medium-alkalinity steel slag and application thereof |
| CN102399934A (en) * | 2010-09-07 | 2012-04-04 | 鞍钢股份有限公司 | Pre-melting type converter after-furnace slagging agent and manufacturing method thereof |
| CN102534066A (en) * | 2011-12-13 | 2012-07-04 | 河南科技大学 | High-temperature molten steel slag treating method |
| CN104342524A (en) * | 2014-06-30 | 2015-02-11 | 新疆八一钢铁股份有限公司 | Harmless utilization process of stemming after application of blast furnace |
| CN110407494A (en) * | 2019-05-17 | 2019-11-05 | 江苏瑞沃建设集团有限公司 | A kind of preparation method of the modified steel scoria asphalt with low volume expansion |
| CN114907028A (en) * | 2021-02-10 | 2022-08-16 | 上海梅山钢铁股份有限公司 | Steel slag modifier and method for modifying converter steel slag |
| CN115807138A (en) * | 2022-12-20 | 2023-03-17 | 中冶京诚工程技术有限公司 | Steel slag online treatment system and steel slag online treatment method |
| CN115807138B (en) * | 2022-12-20 | 2024-03-15 | 中冶京诚工程技术有限公司 | Online steel slag treatment system and online steel slag treatment method |
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|---|---|
| CN100534939C (en) | 2009-09-02 |
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