CN102730991A - Method for producing sulfate resistant cement by using converter steel slag - Google Patents

Method for producing sulfate resistant cement by using converter steel slag Download PDF

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Publication number
CN102730991A
CN102730991A CN2012102211309A CN201210221130A CN102730991A CN 102730991 A CN102730991 A CN 102730991A CN 2012102211309 A CN2012102211309 A CN 2012102211309A CN 201210221130 A CN201210221130 A CN 201210221130A CN 102730991 A CN102730991 A CN 102730991A
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cement
grog
furnace slag
steel slag
converter steel
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CN102730991B (en
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陈磊
武学龙
蒋冠平
翟胜利
景国
鄢平
杨建军
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Jiugang Group Hongda Construction Materials Co ltd
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Jiugang Group Hongda Building Materials Co Ltd
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Abstract

The invention discloses a method for producing sulfate resistant cement by using converter steel slag and aims to overcome the following problems existing in the prior art: 1, a problem of mineral composition, i.e., the problem that C3A in sulfate resistant cement is hard to meet requirements; 2, problems in production technology, e.g., skinning and blocking in operation of a preheater and ball formation and ring formation in a rotary kiln. Raw materials used in the method provided in the invention comprise, by weight, 14 to 18% of converter steel slag, 68 to 72% of mining debris of limestone, 6 to 10% of aeolian sand and 4 to 8% granulated blast furnace slag. According to the invention, 14 to 18% of converter steel slag is used, which makes a breakthrough to conventional proportioning of raw materials, wherein the maximum addition amount of converter steel slag is 6.0%; the proportion of the raw material of limestone is decreased by 8 to 12%, thereby saving consumption of natural raw materials and reducing production cost for cement. In the produced cement, the industrial by-product desulfurized gypsum is used as a cement retarder ingredient to substitute natural gypsum, and the product has good performance.

Description

Utilize bessemer furnace slag to produce the method for sulphate-resistant cement
Technical field
The present invention relates to utilize bessemer furnace slag to produce the method for sulphate-resistant cement.
Background technology
The sulphate-resistant cement grog is a staple anti-in producing, high sulphate-resistant cement.In anti-, high sulphate-resistant cement be the Portland clinker of forming with certain minerals; Add proper amount of gypsum; Levigate process have the opposing medium, higher concentration sulfate ion erosive hydraulic cementing materials; Sulphate-resistant cement is as a kind of extraordinary hydraulic engineering cement; Mainly be applicable to the water conservancy, harbour, culvert, diversion and the underground works that receive sulphate attack, the sulphate-resistant cement grog has bigger difference with common grog to the particular requirement of mineral composition on raw meal proportioning and cement kiln calcining; The principle of selecting the sulphate-resistant cement clinker mineral to form is: less C is arranged in the grog 3A (tricalcium aluminate) and suitable C 3S (tricalcium silicate) mineral need higher corrosion resistant C on the contrary 2S (Dicalcium Phosphate (Feed Grade)) and have the C of good resistance sulphate corrosion 4AF (celite) mineral content.GB748-2005 standard-required, in the anti-cement: C 3S≤50.0%, C 3A difference≤3.0% is in high sulphate-resistant cement: C 3S difference≤55.0%, C 3A≤5.0%; Wherein, C 3The content of S and CaO (quicklime) and SiO 2(silicon-dioxide) is relevant, C 3The content of A and Al 2O 3(aluminium sesquioxide) and Fe 2O 3(red oxide of iron) is relevant.
The grog three ratio that the production of prior art sulfate resistance grog is set is:
KH (saturation ratio, (CaO-1.65Al 2O 3-0.35 Fe 2O 3)/2.8 SiO 2)): 0.910 ± 0.020;
N (silica modulus, SiO 2/ (Al 2O 3+ Fe 2O 3)): 2.2 ± 0.10;
P (aluminium-oxygen modulus, Al 2O 3/ Fe 2O 3): 0.7 ± 0.10.
According to the calculation formula of mineral composition, C 3S=3.80 SiO 2(3KH-2), C in the grog 3The control of S content can pass through to improve or reduce the ratio of Wingdale in the raw material, thereby the content that improves or reduce CaO is realized.C 3A=2.65 (Al 2O 3-0.64 Fe 2O 3), reduce C 3The content of A has two kinds of approach: the one, improve Fe 2O 3Content, the one, reduce Al 2O 3Content.Anti-, high sulphate-resistant cement C in satisfying 3A is≤5.0% and 3.0% needs respectively, prior art Fe 2O 3Will bring up to more than 4.5%, the proportioning of iron-bearing material iron powder will bring up to 8.0% by 5.0%.
On calcined by rotary kiln, prior art is Fe in improving raw material 2O 3Content after, P descends, and has reduced the temperature and the liquid phase viscosity of liquid phase appearance.But after amount of liquid phase increases; Material is responsive in reacting in rotary kiln, and sintering range narrows down, and temperature is controlled bad a little; Will cause the skinning obstruction of preheater and balling, the ring formation of rotary kiln; Make the kiln system improper ventilation, and then influence the output of rotary kiln and the quality of grog, bring great difficulty for the operation of rotary kiln.
Summary of the invention
The purpose of this invention is to provide a kind of method of utilizing bessemer furnace slag to produce sulphate-resistant cement, one will solve C in the sulphate-resistant cement that exists on the prior art 3A is difficult to meet the requirements of the mineral composition problem; Two will solve prior art to agricultural technology problems such as the balling of skinning, obstruction and the rotary kiln of preheater operation, ring formation.
A kind of method of utilizing bessemer furnace slag to produce sulphate-resistant cement is following steps:
A, raw meal proportioning: the feed proportioning of following column weight amount percentage composition,
Bessemer furnace slag 14～18%, Wingdale rejects 68～72%, drift-sand 6～10%, granulated blast-furnace slag 4～8%.
B, high-temperature calcination: in the cement produced with the dry method production process, raw material decompose the entering rotary kiln through preheating, and high-temperature calcination forms grog, and the formation temperature of grog (clinkering zone) is between 1100--1450 ℃; Form in the hear rate at grog, the required hear rate of the decomposition of carbonate accounts for whole more than 50% of hear rate; Through the bessemer furnace slag that pyrotic smelting produces, carbonate wherein decomposes fully, and about 40% CaO need not to decompose and can directly react formation silicate mineralss with other oxide compounds, 50 ℃ of firing temperature reductions in the bessemer furnace slag.
C, cement ingredient: the feed proportioning of following column weight amount percentage composition, sulphate-resistant cement grog 95.0%, industry byproduct desulfurated plaster 5.0%.
Raw material bessemer furnace slag of the present invention is called for short slag, be meant that the converter of smelter produces in smelting process with C 2S is main iron slag, is the industrial melting waste slag of grey black, light weight, many pores, Fe wherein 2O 3Higher, the Al of content 2O 3Content relatively low, contain the CaO about 40% simultaneously, in raw meal proportioning, need be through not increasing substantially Fe 2O 3Content, increase C 4The content of AF mineral reduces C in the grog 3The content of A, and only through reducing Al 2O 3Content just can be easy to reduction C 3The content of A makes the production of sulfate resistance grog become more easy.In process of production, owing to Al in the grog 2O 3, Fe 2O 3Relative content reduce, Aluminium-oxygen modulus and silica modulusAfter the raising, amount of liquid phase reduces relatively, and flux property mineral content reduces relatively, and sintering range broadens relatively, reduces or has avoided the skinning of preheater to stop up and balling, the ring formation of rotary kiln.
Bessemer furnace slag Chemical Composition (%)
Figure 450039DEST_PATH_IMAGE001
Advantage of the present invention:
1, Al in the bessemer furnace slag 2O 3Low than other ferriferous raw materials, when adopting the bessemer furnace slag batching, need not increase substantially Fe 2O 3Content just can be realized the mineral composition of sulfate resistance grog, makes the production of sulphate-resistant cement become easy;
2, solved dry-process rotory kiln in calcining sulfate resistance grog process, because Fe 2O 3The grog firing range that improve, aluminium-oxygen modulus is brought after reducing narrows down, and preheater is prone to the production problem that skinning stops up;
3, contain 36～45% CaO in the bessemer furnace slag, use 1 ton of bessemer furnace slag with respect to the Wingdale raw material of having practiced thrift 0.8 ton; The present invention has adopted 14～18% bessemer furnace slag batching, has broken through in raw meal proportioning bessemer furnace slag and be 6.0% maximum incorporation; Wingdale proportioning raw materials decline 8--12%, the consumption of having practiced thrift natural matter has reduced the manufacture of cement cost; Utilize the good characteristics of bessemer furnace slag burn-ability; Through groping repeatedly to the calcined by rotary kiln operative technique; Proposition will be gone into kiln material rate of decomposition and will be reduced to 80～85% by original 85～95%, and kiln end temperature and calciner temperature are reduced by 50 ℃ and 20 ℃ (be that kiln end temperature is reduced to 900～950 ℃ by 950～1050 ℃, calciner temperature is reduced to 840～860 ℃ by 860～900 ℃) respectively; Widen high-temperature blower air door to 100%; Strengthen the kiln ventilation amount, guarantee often to be in the kiln oxidizing atmosphere, the screen over-size with 88 microns sieve apertures of raw material fineness is loosened to 18% present (as long as the screen over-size of 300 microns sieve apertures is less than 1.5%) by original≤10% simultaneously; Under satisfied and favourable incinerating condition, improved mill output and reduced power consumption.These operation measures that become more meticulous have been created condition for improving the proportioning of bessemer furnace slag in raw material.
4, the granularity that will go into to grind bessemer furnace slag is controlled at below the 5mm, and after the grindability of material was improved, water cut reduces, raw grinding equipment unit-hour output had improved 10-20%, has solved the not smooth problem of feed system in the production process simultaneously;
5, owing to the high-temperature calcination of bessemer furnace slag process, carbonate wherein all decomposes, and descends significantly in grog sintering process hear rate, and the standard coal consumption of ton grog reduces 5kg.
6, replace natural dihydrate gypsum to make cement setting retarder batching good product performance the industry byproduct desulfurated plaster in the cement.
7, the present invention adopts Wingdale rejects, drift-sand, granulated blast-furnace slag and bessemer furnace slag four component proportioning processes; These four kinds of raw materials all are the metallurgical industry ore dressing except that drift-sand or smelt solid waste; The consumption of natural matter in the cement production process had both been practiced thrift in the introducing of these solid waste, had realized economic Sustainable development; Simultaneously, reduced the manufacture of cement cost again.
Description of drawings
Fig. 1 is a process flow sheet of the present invention.
Embodiment
Following embodiment can further specify the present invention, but does not limit the present invention in any way.
Embodiment 1Middle sulphate-resistant cement
A, raw meal proportioning: the feed proportioning of following column weight amount percentage composition,
Bessemer furnace slag 14.0%, Wingdale rejects 72.0.0%, drift-sand 6.0%, granulated blast-furnace slag 8.0%; C in the grog 3S, C 3A content is respectively 53.86 and 3.88%, through ball mill closed-circuit grinding (preparation raw material);
B, high-temperature calcination: in the cement produced with the dry method production process, raw material decompose the entering rotary kiln through preheating, and high-temperature calcination forms grog, and the formation temperature of grog (clinkering zone) is at 1100 ℃;
C, cement ingredient: the feed proportioning of following column weight amount percentage composition, sulphate-resistant cement grog 95.0%, industry byproduct desulfurated plaster 5.0%.
Embodiment 2High sulphate-resistant cement
A, raw meal proportioning: the feed proportioning of following column weight amount percentage composition,
Bessemer furnace slag 16.0%, Wingdale rejects 70.0%, drift-sand 8.0%, granulated blast-furnace slag 6.0%; C in the grog 3S, C 3A content is respectively 49.04 and 2.18%, through ball mill closed-circuit grinding (preparation raw material);
B, high-temperature calcination: in the cement produced with the dry method production process, raw material decompose the entering rotary kiln through preheating, and high-temperature calcination forms grog, and the formation temperature of grog (clinkering zone) is at 1450 ℃;
C, cement ingredient: the feed proportioning of following column weight amount percentage composition, sulphate-resistant cement grog 95.0%, industry byproduct desulfurated plaster 5.0%.
 
Embodiment 3High sulphate-resistant cement
A, raw meal proportioning: the feed proportioning of following column weight amount percentage composition,
Bessemer furnace slag 18.0%, Wingdale rejects 68.0%, drift-sand 10.0%, granulated blast-furnace slag 4.0%; C in the grog 3S, C 3A content is respectively 47.67 and 1.20%,, through ball mill closed-circuit grinding (preparation raw material);
B, high-temperature calcination: in the cement produced with the dry method production process, raw material decompose the entering rotary kiln through preheating, and high-temperature calcination forms grog, and the formation temperature of grog (clinkering zone) is at 1200 ℃;
C, cement ingredient: the feed proportioning of following column weight amount percentage composition, sulphate-resistant cement grog 95.0%, industry byproduct desulfurated plaster 5.0%.
Comparative Examples:
A, raw meal proportioning: the feed proportioning of following column weight amount percentage composition: iron powder 8% and Wingdale 80%, drift-sand 5%, granulated blast-furnace slag 7%, produce middle sulphate-resistant cement.
The contrast of the embodiment of the invention and Comparative Examples sees the following form, and explains that each age strength of cement clinker of Comparative Examples all is not so good as the present invention.
 

Claims (1)

1. method of utilizing bessemer furnace slag to produce sulphate-resistant cement is characterized in that being following steps:
A, raw meal proportioning: the feed proportioning of following column weight amount percentage composition,
Bessemer furnace slag 14～18%, Wingdale rejects 68～72%, drift-sand 6～10%, granulated blast-furnace slag 4～8%;
B, high-temperature calcination: in the cement produced with the dry method production process, raw material decompose the entering rotary kiln through preheating, and high-temperature calcination forms grog, and the formation temperature of grog is between 1100--1450 ℃;
C, cement ingredient: the feed proportioning of following column weight amount percentage composition, sulphate-resistant cement grog 95.0%, desulfurated plaster 5.0%.
CN201210221130.9A 2012-06-29 2012-06-29 Utilize the method that converter slag produces sulfate-resistant cement Active CN102730991B (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103466970A (en) * 2013-08-28 2013-12-25 句容联众科技开发有限公司 Preparation method of sulfate corrosion resistance cement
CN104098283A (en) * 2014-08-06 2014-10-15 攀枝花钢城集团有限公司 Construction method for sintering cement by use of converter steel slag
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
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

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
袁美栖等: "用钢渣作原料配烧水泥熟料的研究", 《南京工业大学学报（自然科学版）》, no. 2, 2 July 1982 (1982-07-02), pages 71 - 84 *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103466970A (en) * 2013-08-28 2013-12-25 句容联众科技开发有限公司 Preparation method of sulfate corrosion resistance cement
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
CN104098283A (en) * 2014-08-06 2014-10-15 攀枝花钢城集团有限公司 Construction method for sintering cement by use of converter steel 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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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.

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