CN102730991B - Utilize the method that converter slag produces sulfate-resistant cement - Google Patents
Utilize the method that converter slag produces sulfate-resistant cement Download PDFInfo
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- CN102730991B CN102730991B CN201210221130.9A CN201210221130A CN102730991B CN 102730991 B CN102730991 B CN 102730991B CN 201210221130 A CN201210221130 A CN 201210221130A CN 102730991 B CN102730991 B CN 102730991B
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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
Abstract
The invention discloses a kind of method utilizing converter slag to produce sulfate-resistant cement, one to solve C in the sulfate-resistant cement existed in prior art3A is extremely difficult to the mineral composition problem required；Two to solve the agricultural technology problems such as the balling of skinning, blocking and rotary kiln, the ring formation that preheater operates by prior art。The feed proportioning of row weight percentage below the present invention: converter slag 14～18%, limestone rejects 68～72%, drift-sand 6～10%, granulated blast-furnace slag 4～8%。Present invention employs the converter slag dispensing of 14～18%, breach the maximum incorporation that converter slag in raw meal proportioning is 6.0%；Raw limestone proportioning decline 8--12%, has saved the consumption of natural material, has reduced manufacture of cement cost。Industry byproduct desulfurated plaster is replaced natural dihydrate gypsum to make cement retarder dispensing good product performance by cement。
Description
Technical field
The present invention relates to the use of the method that converter slag produces sulfate-resistant cement。
Background technology
Sulfate-resistant cement grog is main component anti-in producing, high sulfate resisting cement。In anti-, high sulfate resisting cement be with the Portland clinker of certain minerals composition, add proper amount of gypsum, levigate make there is the hydraulic cementing materials that medium, the higher concentration sulfate ion of opposing corrodes, sulfate-resistant cement is as a kind of extraordinary hydraulic engineering cement, it is primarily adapted for use in by the water conservancy of sulfate attack, harbour, culvert, diversion and underground engineering, the sulfate-resistant cement grog particular/special requirement to mineral composition, has bigger difference with common grog on raw meal proportioning and cement kiln calcining；The principle of selection sulfate-resistant cement clinker mineral composition is: have less C in grog3A(tricalcium aluminate) and suitable C3S(tricalcium silicate) mineral, need the C of relatively highly corrosion resistant on the contrary2S(dicalcium silicate) and there is the C of good anti-sulphates corrosive4AF(tetra calcium aluminoferrite) mineral content。GB748 2005 standard-required, in middle water resistant mud: C3S≤50.0%, C3A difference≤3.0%, in high sulfate resisting cement: C3S difference≤55.0%, C3A≤5.0%；Wherein, C3The content of S and CaO(calcium oxide) and SiO2(silicon dioxide) is relevant, C3The content of A and Al2O3(aluminium sesquioxide) and Fe2O3(iron sesquioxide) is relevant。
Prior art sulfate resistance grog produce the grog three ratio that sets as:
KH(saturation ratio, (CaO-1.65Al2O3-0.35Fe2O3)/2.8SiO2)): 0.910 ± 0.020；
N(silica modulus, SiO2/ (Al2O3+Fe2O3)): 2.2 ± 0.10；
P(aluminium-oxygen modulus, Al2O3/Fe2O3): 0.7 ± 0.10。
Computing formula according to mineral composition, C3S=3.80SiO2(3KH-2), C in grog3The control of S content can be passed through to improve or reduce the ratio of limestone in raw material, thus the content improving or reducing CaO realizes。C3A=2.65(Al2O3-0.64Fe2O3), reduce C3The content of A has two kinds of approach: one is improve Fe2O3Content, one be reduce Al2O3Content。Anti-, high sulfate resisting cement C in meeting3The needs of A difference≤5.0% and 3.0%, prior art Fe2O3Will bringing up to more than 4.5%, the proportioning of iron-bearing material iron powder will be brought up to 8.0% by 5.0%。
On calcined by rotary kiln, prior art is Fe in improving raw material2O3Content after, P decline, reduce liquid phase occur temperature and liquid phase viscosity。But after amount of liquid phase increases, material is sensitive in reacting in rotary kiln, sintering range narrows, temperature somewhat controls bad, will result in the Coating clogging of preheater and the balling of rotary kiln, ring formation, make kiln system improper ventilation, and then affect the yield of rotary kiln and the quality of grog, bring great difficulty to the operation of rotary kiln。
Summary of the invention
It is an object of the invention to provide a kind of method utilizing converter slag to produce sulfate-resistant cement, one to solve C in the sulfate-resistant cement existed in prior art3A is extremely difficult to the mineral composition problem required；Two to solve the agricultural technology problems such as the balling of skinning, blocking and rotary kiln, the ring formation that preheater operates by prior art。
A kind of method utilizing converter slag to produce sulfate-resistant cement is following steps:
A, raw meal proportioning: the feed proportioning of following row weight percentage,
Converter slag 14～18%, limestone rejects 68～72%, drift-sand 6～10%, granulated blast-furnace slag 4～8%。
B, high-temperature calcination: in cement produced with the dry method production process, raw material enter rotary kiln preheated decomposition, and high-temperature calcination forms grog, and the formation temperature (clinkering zone) of grog is between 1100--1450 DEG C；In grog firing system heat consumption, the required heat consumption of decomposing of carbonate accounts for more than the 50% of whole heat consumption；Through the converter slag that pyrolytic semlting produces, carbonate therein decomposes completely, and in converter slag, the CaO of about 40% directly can react formation silicate mineral without decomposing with other oxides, and firing temperature reduces by 50 DEG C。
C, cement ingredient: the feed proportioning of following row weight percentage, sulfate-resistant cement grog 95.0%, industry byproduct desulfurated plaster 5.0%。
Raw material converter slag of the present invention, is called for short slag, refer to that the converter of smelter produces in smelting process with C2S is main iron slag, in grey black, the industrial melting waste slag of light weight, many pores, and Fe therein2O3Content is higher, Al2O3Content relatively low, contain the CaO of about 40%, in raw meal proportioning, it is not necessary to by increasing substantially Fe simultaneously2O3Content, increase C4The content of AF mineral reduces C in grog3The content of A, and only by reducing Al2O3Content just can be easy to reduction C3The content of A, makes the production of sulfate resistance grog become more easy。In process of production, due to Al in grog2O3、Fe2O3Relative amount reduce,Aluminium-oxygen modulus and silica modulusAfter raising, amount of liquid phase relative reduction, fluxed mineral content reduces relatively, and sintering range broadens relatively, reduces or avoid Coating clogging and the balling of rotary kiln, the ring formation of preheater。
Converter slag chemical analysis (%)
The invention have the advantages that
1, Al in converter slag2O3Low compared with other ferriferous raw materials, when adopting converter slag dispensing, it is not necessary to increase substantially Fe2O3Content just can realize the mineral composition of sulfate resistance grog, makes the production of sulfate-resistant cement become easy；
2, dry-process rotory kiln is solved in calcining sulfate resistance grog process, due to Fe2O3The sinter leaching temperature range that raising, aluminium-oxygen modulus are brought after reducing narrows, the production problem of the easy Coating clogging of preheater；
3, containing the CaO of 36～45% in converter slag, use 1 ton of converter slag relative to the raw limestone having saved 0.8 ton；Present invention employs the converter slag dispensing of 14～18%, breach the maximum incorporation that converter slag in raw meal proportioning is 6.0%；Raw limestone proportioning decline 8--12%, has saved the consumption of natural material, has reduced manufacture of cement cost；Utilize the feature that converter slag burn-ability is good, by repeatedly groping calcined by rotary kiln operating technology, propose to be reduced to 80～85% by entering kiln material resolution ratio by original 85～95%, kiln end temperature and calciner temperature are reduced by 50 DEG C and 20 DEG C respectively, and (namely kiln end temperature is reduced to 900～950 DEG C by 950～1050 DEG C, calciner temperature is reduced to 840～860 DEG C by 860～900 DEG C), widen high-temperature blower air door to 100%, strengthen kiln ventilation amount, guarantee in kiln often in oxidizing atmosphere, as long as simultaneously by the screen over-size of raw material fineness 88 pm mesh size by original≤10% be loosened to the screen over-size of present 18%(300 pm mesh size less than 1.5%), when meeting and favorably calcining, improve mill output and reduce power consumption。These refinement measures are improve converter slag proportioning in raw material to create condition。
4, entering to grind the Task-size Controlling of converter slag at below 5mm, after the grindability of material is improved, water content reduces, during raw grinding table of equipment, output increased 10 20%, solves the problem that in production process, feed system is not smooth simultaneously；
5, owing to converter slag is through high-temperature calcination, carbonate therein all decomposes, significantly declines in sinter leaching process heat consumption, and ton grog standard coal consumption reduces 5kg。
6, industry byproduct desulfurated plaster is replaced natural dihydrate gypsum to make cement retarder dispensing good product performance by cement。
7, the present invention adopts limestone rejects, drift-sand, granulated blast-furnace slag and converter slag four component proportioning process; these four raw material is all metallurgical industry ore dressing except drift-sand or smelts solid waste; the introducing of these solid waste; both the consumption of natural material in cement production process had been saved; achieve the sustainable development of economy; meanwhile, manufacture of cement cost is reduced again。
Accompanying drawing explanation
Fig. 1 is the process chart of the present invention。
Detailed description of the invention
The following examples can further illustrate the present invention, but does not limit the present invention in any way。
Embodiment 1Middle sulfate-resistant cement
A, raw meal proportioning: the feed proportioning of following row weight percentage,
Converter slag 14.0%, limestone rejects 72.0.0%, drift-sand 6.0%, granulated blast-furnace slag 8.0%；C in grog3S、C3A content respectively 53.86 and 3.88%, through ball mill closed-circuit grinding (preparing raw material)；
B, high-temperature calcination: in cement produced with the dry method production process, raw material enter rotary kiln preheated decomposition, and high-temperature calcination forms grog, and the formation temperature (clinkering zone) of grog is at 1100 DEG C；
C, cement ingredient: the feed proportioning of following row weight percentage, sulfate-resistant cement grog 95.0%, industry byproduct desulfurated plaster 5.0%。
Embodiment 2High sulfate resisting cement
A, raw meal proportioning: the feed proportioning of following row weight percentage,
Converter slag 16.0%, limestone rejects 70.0%, drift-sand 8.0%, granulated blast-furnace slag 6.0%；C in grog3S、C3A content respectively 49.04 and 2.18%, through ball mill closed-circuit grinding (preparing raw material)；
B, high-temperature calcination: in cement produced with the dry method production process, raw material enter rotary kiln preheated decomposition, and high-temperature calcination forms grog, and the formation temperature (clinkering zone) of grog is at 1450 DEG C；
C, cement ingredient: the feed proportioning of following row weight percentage, sulfate-resistant cement grog 95.0%, industry byproduct desulfurated plaster 5.0%。
Embodiment 3High sulfate resisting cement
A, raw meal proportioning: the feed proportioning of following row weight percentage,
Converter slag 18.0%, limestone rejects 68.0%, drift-sand 10.0%, granulated blast-furnace slag 4.0%；C in grog3S、C3A content respectively 47.67 and 1.20%, through ball mill closed-circuit grinding (preparing raw material)；
B, high-temperature calcination: in cement produced with the dry method production process, raw material enter rotary kiln preheated decomposition, and high-temperature calcination forms grog, and the formation temperature (clinkering zone) of grog is at 1200 DEG C；
C, cement ingredient: the feed proportioning of following row weight percentage, sulfate-resistant cement grog 95.0%, industry byproduct desulfurated plaster 5.0%。
Comparative example:
A, raw meal proportioning: the feed proportioning of following row weight percentage: iron powder 8% and limestone 80%, drift-sand 5%, granulated blast-furnace slag 7%, produce middle sulfate-resistant cement。
Following table is shown in the contrast of the embodiment of the present invention and comparative example, illustrates that each age strength of clinker of comparative example is all not so good as the present invention。
Claims (1)
1. one kind utilizes the method that converter slag produces sulfate-resistant cement, it is characterised in that for following steps:
A, raw meal proportioning: the feed proportioning of following row weight percentage,
Converter slag 14～18%, limestone rejects 68～72%, drift-sand 6～10%, granulated blast-furnace slag 4～8%；
B, high-temperature calcination: in cement produced with the dry method production process, raw material enter rotary kiln preheated decomposition, and high-temperature calcination forms grog, and the formation temperature of grog is 1450 DEG C；
C, cement ingredient: the feed proportioning of following row weight percentage, sulfate-resistant cement grog 95.0%, desulfurated plaster 5.0%；
Rotary kiln temperature is 900～950 DEG C, and the calciner temperature that raw material thermally decompose in advance is 840～860 DEG C, raw material fineness be the screen over-size by 300 pm mesh size less than 1.5%, enter to grind the Task-size Controlling of converter slag at below 5mm。
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103466970B (en) * | 2013-08-28 | 2015-08-05 | 周建平 | A kind of preparation method of Sulfate corrosion resistance cement |
| CN104724956A (en) * | 2013-12-20 | 2015-06-24 | 南京中联水泥有限公司 | Production method of low-alkaline moderately-resistant sulfate silicate clinker |
| CN104098283B (en) * | 2014-08-06 | 2016-06-29 | 攀枝花钢城集团有限公司 | The construction method of cement is sintered with converter slag |
| CN106082721A (en) * | 2016-06-03 | 2016-11-09 | 江苏省冶金设计院有限公司 | A kind of clinker utilizing non-ferrous metal metallurgy slag to generate |
| CN106396437A (en) * | 2016-08-31 | 2017-02-15 | 酒钢(集团)宏达建材有限责任公司 | Method of using industrial solid slag to produce silicate cement for nuclear power engineering |
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Non-Patent Citations (1)
| Title |
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| 用钢渣作原料配烧水泥熟料的研究;袁美栖等;《南京工业大学学报（自然科学版）》;19820702(第2期);第71-84页 * |
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Address after: No. 677 Hongda Road, Jiabei Industrial Park, Jiayuguan City, Gansu Province, 735199 Patentee after: Jiugang Group Hongda Construction Materials Co.,Ltd. Address before: 735100 Xijiao, Jiayuguan City, Gansu Province Patentee before: HONGDA BUILDING MATERIAL CO., LTD. OF JIUQUAN IRON & STEEL (Group) Co.,Ltd. |