CN101693928B - Method for purifying primarily selected slag steel - Google Patents

Method for purifying primarily selected slag steel Download PDF

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Publication number
CN101693928B
CN101693928B CN2009100937386A CN200910093738A CN101693928B CN 101693928 B CN101693928 B CN 101693928B CN 2009100937386 A CN2009100937386 A CN 2009100937386A CN 200910093738 A CN200910093738 A CN 200910093738A CN 101693928 B CN101693928 B CN 101693928B
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steel
slag
primarily
granularity
wet
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CN101693928A (en
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廖洪强
赛音巴特尔
马刚平
李成宜
周宇
才艳芳
李世青
孙嵬
余广炜
冯向鹏
赵宏贵
于宪章
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Shougang Group Co Ltd
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Shougang Corp
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02WCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00Technologies for solid waste management
    • Y02W30/50Reuse, recycling or recovery technologies

Abstract

The invention discloses a method for purifying primarily selected slag steel, which belongs to the technical field of the comprehensive utilization of solid waste of the metallurgical industry, in particular to the field of the comprehensive treatment and utilization of slag steel. A device for the method mainly comprises a dry automatic milling system, a wet ball milling system, a wet magnetic separation system and a tailing mud treatment system. The method can produce products such as high-quality bean steel with a grade being larger than 90 percent and high-quality block steel with a grade being larger than 85 percent for steel-making, refined iron powder with a grade being larger than 65 percent for iron-making as well as tailing mud and tailing cakes used as raw materials of baking-free bricks. The invention combines the advantages of dry and wet slag steel treatment technologies, realizes the continuous treatment and the large-scale production of the primarily selected slag steel with the grain size of 0-300mm, has simple and practical process, cleanness, environmental protection and lower investment and operation cost, realizes the high added value utilization of the primarily selected slag steel and sufficiently embodies ideas of cleaner production and circular economy of the steel Industry.

Description

A kind of method of purification of primarily selected slag steel
Technical field
The present invention relates to the method that a kind of primarily selected slag steel is purified, belong to metallurgy industry comprehensive utilization of resources technical field.
Background technology
In steel manufacture process, slag is main by product, and its output is about the 10%-15% of output of steel, if the slag that produces is all handled high-grade slag product made from steel of purifying out, then can reduce steel-making and ironmaking cost greatly, have remarkable economic efficiency and social benefit.
At present, normal both at home and abroad employing dry method and two kinds of technologies of wet method are carried out slag steel purification processes.The advantage of dry method slag steel purifying technique is: technical process is simple, facility investment is few, floor space is little, be not subject to seasonal restrictions, and all can produce the whole year; The advantage of wet method slag steel purifying technique is: slag steel good fluidity, help the grinding machine ore discharge, throughput is big, and it is clean, of high grade to reclaim beans steel cleaning surfaces.Chinese patent CN101139655 has reported and has adopted autogenous mill, semi-autogenous mill to carry out the method that the dry method slag is handled, but does not solve the treatment process of granularity 0-30mm slag steel; Shortcomings such as Chinese patent CN101264464 has reported the method that the wet ball grinding slag is handled, but does not solve in the treatment process and wet method slag purification processes of granularity greater than 50mm slag steel, and how heavy water requirement is, pond, shallow lake floor space is big.
Summary of the invention
The object of the present invention is to provide and a kind ofly can produce high-efficiency high-quality slag product made from steel and high value added product, and reduce the consumption of new water and reduce floor space, produce and the slag steel method of purification of running cost thereby reduce.
The technical solution adopted in the present invention is: with the granularity 30-300mm that produces through slag process for producing line with less than the slag steel of 30mm primary election is raw material, adopt the synchronous and continuous production processes flow process of a cover dry method and wet method, for varigrained primarily selected slag steel through the dry method autogenous grinding, wet ball grinding, after operations such as wet magnetic separation and the processing of tail mud are handled, produce three kinds of high-efficiency high-quality slag product made from steel and two kinds of high value-added products: can produce the grade that is used to make steel greater than 90% high-quality beans steel, grade is greater than 85% high-quality piece steel, and the grade that is used to smelt iron is greater than the smart powder of 65% iron and as the tailings pug and the tailings mud cake of non-burning brick raw material.
The method of purification of primarily selected slag steel specifically adopts following steps:
1) primarily selected slag steel of granularity 30-300mm by rotary conveyor be transported in the dry method autogenous mill handle after, handle by the tail sheet screening, obtain the piece product made from steel of oversize degree greater than 30mm, the undersize degree closes less than the low-grade slag steel reinforced concrete of 30mm less than the slag steel of 30mm and granularity and enters the wet ball grinding system and handle; The primarily selected slag steel of described granularity 30-300mm, its grade is greater than 45%; Granularity is greater than the piece product made from steel of 30mm, and its grade is greater than 85%; Non-grinding medium in the described dry method autogenous mill, and the material of the material size 200~300mm of assurance autogenous mill is greater than 50%;
2) after mixing back granularity carries ball mill by wet process to handle less than the slag steel of 30mm by rotary conveyor, sieve the beans product made from steel that obtains sieving 3-30mm by shaft screen, sieving down, ore deposit liquid enters the wet magnetic separation system handles;
3) ore deposit liquid is after wet magnetic separator is handled, and the concentrate liquid with magnetic obtains granularity less than the smart powder product of 3mm iron after screw classifier promotes dehydration, and nonmagnetic mine tailing liquid obtains the tailings pug after screw classifier promotes dehydration;
4) concentrate liquid and mine tailing hydrorrhea stream slag slurry carries out precipitation process by squeezing in the precipitation concentration basin, and logical the squeezing into of throw out carried out the press filtration processing in the pressure filter, obtain tailings mud cake byproduct, and settling tank and pressure filter overflow clear water return in the circulation clean water basin and use.
In step 2) described beans product made from steel, its grade is greater than 90%.Be added with steel ball or rod iron grinding element in the described ball mill by wet process, the grinding element filling ratio is 20~30%.
Less than the smart powder product of 3mm iron, its grade is greater than 65% in the described granularity of step 3).Described tailings pug, its granularity are that water ratio is less than 15% less than 3mm; At the described tailings mud cake of step 4), its granularity is that water ratio is less than 35% less than 1mm.
The present invention is in conjunction with the advantage of dry method and two kinds of slag steel of wet method treatment technology; continuous processing and large-scale production have been realized to particle diameter 0-300mm primarily selected slag steel; adopt circulating water pool to reduce the consumption of new water simultaneously; adopt new-type settling tank to reduce floor space; thereby reduced slag steel purification production cost, demonstrated fully Iron And Steel Industry " cleaner production " and " recycling economy " theory.
Description of drawings
Fig. 1 is a process flow sheet of the present invention
Among the figure: solid arrow is represented the primarily selected slag steel material flow; Dotted arrow is represented the water circulation use flow process.
1, primarily selected slag steel, 2, rotary conveyor, 3, slag steel autogenous mill, 4, tail sheet, 5, piece product made from steel, 6, less than the slag steel of 30mm, 7, rotary conveyor, 8, ball mill by wet process, 9, shaft screen, 10,3-30mm beans steel, 11, magnetic separator, 12, the concentrate screw classifier, 13, mine tailing screw classifier, 14, the tailings pug, 15, the smart powder of iron, 16, precipitation concentration basin, 17, pressure filter, 18, the tailings mud cake, 19, circulation clean water basin, 20, fresh water pump, 21, replenish new water.
Embodiment
Below by embodiment the specific embodiment of the present invention is described further:
Concrete implementation step is:
1, dry method autogenous grinding treating processes: primarily selected slag steel 1 raw material of 30-300mm is delivered in the slag steel autogenous mill 3 by rotary conveyor 2 handling equipments, because mutual impact, grinding between the steel slag block make slag separate with steel.Obtain the piece product made from steel 5 greater than 30mm after sieving with the common rotating tail sheet 4 of autogenous mill cylindrical shell, sieve uses less than the raw material that 30mm slag steel is handled as wet ball grinding down.
2, wet ball grinding treating processes: all are delivered in the ball mill by wet process 8 through handling equipments such as rotary conveyors 7 less than the slag steel 6 of 30mm, in slag steel and ball-milling medium grinding process, slip is further separated with the beans steel by adding water.Material obtains sieving the beans steel 10 of 3-30mm after homemade shaft screen 9 screenings after the discharging of grinding machine tail end, the minus mesh slurries are delivered in the permanent-magnet drum type magnetic separator 11.
3, wet magnetic separation treating processes: the minus mesh slurries that produce in the ball mill are delivered to permanent-magnet drum type magnetic separator 11 carry out the magnetic separation processing, after magnetic separation, concentrate liquid promotes dehydration by screw classifier 12, obtains the smart powder product 15 of iron; Mine tailing liquid obtains tailings pug byproduct 14 after then promoting dehydration by screw classifier 13.
4, tail mud treating processes: two kinds of overflow waters that produce in screw classifier flow in the precipitation concentration basin 16 and concentrate, and the dreg slurry after concentrating is delivered to and carried out press filtration, dehydration in the pressure filter 17, obtains tailings mud cake byproduct 18.The overflow clear water that settling tank and pressure filter produce is back in the circulation clean water basin 19, and circulation clear water and additional new water 21 are squeezed in ball mill, shaft screen and the magnetic separator by fresh water pump 20 and used for wet ball grinding, magnetic separation process.
Though described embodiments of the present invention, those of ordinary skill in the art can make various distortion or modification in the scope of described claim.

Claims (5)

1. the method for purification of a primarily selected slag steel, it is characterized in that: method comprises dry method from grinding system, wet ball grinding system, wet magnetic separation system and tail mud treatment system, adopts following steps:
1) after the primarily selected slag steel of granularity 30-300mm (1) is transported to the middle processing of dry method autogenous mill (3) by rotary conveyor (2), handle by tail sheet (4) screening, obtain the piece product made from steel (5) of oversize degree greater than 30mm, the undersize degree closes less than the low-grade slag steel reinforced concrete of 30mm less than the slag steel of 30mm and granularity and enters the wet ball grinding system and handle; The primarily selected slag steel of described granularity 30-300mm, its grade is greater than 45%; Described granularity is greater than the piece product made from steel of 30mm, and its grade is greater than 85%; Non-grinding medium in the described dry method autogenous mill (3), and the material of the material size 200~300mm of assurance dry method autogenous mill is greater than 50%;
2) after mixing back granularity carries ball mill by wet process (8) to handle less than the slag steel (6) of 30mm by rotary conveyor (7), sieve beans steel (10) product that obtains sieving 3-30mm by shaft screen (9), sieve ore deposit liquid down enters the wet magnetic separation system handles;
3) ore deposit liquid is after wet magnetic separator (11) is handled, concentrate liquid with magnetic obtains granularity less than smart powder (15) product of 3mm iron after screw classifier (12) promotes dehydration, nonmagnetic mine tailing liquid obtains tailings pug (14) after screw classifier (13) promotes dehydration;
4) concentrate liquid and mine tailing hydrorrhea stream slag slurry carries out precipitation process by squeezing in the precipitation concentration basin (16), logical the squeezing into of throw out carried out the press filtration processing in the pressure filter (17), obtain tailings mud cake (18) byproduct, settling tank and pressure filter overflow clear water return in the circulation clean water basin (19) and use.
2. the method for purification of primarily selected slag steel according to claim 1 is characterized in that: in step 2) described beans product made from steel, its grade is greater than 90%.
3. the method for purification of primarily selected slag steel according to claim 1 is characterized in that: in step 2) described in ball mill by wet process (8) in be added with steel ball or rod iron grinding element, the grinding element filling ratio is 20~30%.
4. the method for purification of primarily selected slag steel according to claim 1 is characterized in that: less than the smart powder product of 3mm iron, its grade is greater than 65% in the described granularity of step 3).
5. the method for purification of primarily selected slag steel according to claim 1, it is characterized in that: at the described tailings pug of step 3), its granularity is that water ratio is less than 15% less than 3mm; At the described tailings mud cake of step 4), its granularity is that water ratio is less than 35% less than 1mm.
CN2009100937386A 2009-10-16 2009-10-16 Method for purifying primarily selected slag steel Active CN101693928B (en)

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Application Number Priority Date Filing Date Title
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CN101693928B true CN101693928B (en) 2011-03-16

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Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103508688B (en) * 2012-06-27 2015-06-17 南京梅山冶金发展有限公司 Post-treatment method for desulphurization slag
CN103060493B (en) * 2012-06-29 2014-10-29 南京梅山冶金发展有限公司 Steel slag water washing ball milling manufacture processing craft
CN103120980B (en) * 2013-02-04 2014-10-01 玉溪大红山矿业有限公司 Rapid detection method of faults of iron ore self-grinding system and device thereof
GB2529876A (en) * 2014-09-05 2016-03-09 Darlow Lloyd & Sons Ltd Reuse of by-products from metallurgical processes
CN105177197B (en) * 2015-09-29 2017-03-01 北京首钢国际工程技术有限公司 A kind of slag iron fine-processing technique
CN106076506A (en) * 2016-06-20 2016-11-09 镇江微鑫钢业有限公司 A kind of process technique of slag deep processing
CN112588796A (en) * 2020-12-31 2021-04-02 唐山燕山钢铁有限公司 Method for effectively separating slag iron of KR desulfurization slag

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Address after: 100041 Shijingshan Road, Shijingshan District, Shijingshan District, Beijing

Patentee after: Shougang Group Co. Ltd.

Address before: 100041 Shijingshan Road, Shijingshan District, Shijingshan District, Beijing

Patentee before: Capital Iron & Steel General Company