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CN1313625C - Process for recovering slag iron ball and slag iron powder from steel-iron slag - Google Patents

Process for recovering slag iron ball and slag iron powder from steel-iron slag Download PDF

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Publication number
CN1313625C
CN1313625C CNB2004100541282A CN200410054128A CN1313625C CN 1313625 C CN1313625 C CN 1313625C CN B2004100541282 A CNB2004100541282 A CN B2004100541282A CN 200410054128 A CN200410054128 A CN 200410054128A CN 1313625 C CN1313625 C CN 1313625C
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slag
iron
steel
powder
balls
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CN1743463A (en
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陆连芳
吴伟民
赵家蒙
金奕
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Baoshan Iron and Steel Co Ltd
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Baoshan Iron and Steel Co Ltd
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    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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Abstract

钢—铁渣中渣铁球及渣铁粉回收工艺，首先对钢铁渣洒水作业，钢—铁渣中的游离CaO与水反应，生成Ca(OH)2，使钢—铁渣膨胀疏松，促使钢—铁粒及粉与渣充分分离；再进行筛分，筛分后，对50mm以上粒级的钢—铁渣磁选，分离出50mm以上的渣钢铁产品，供电炉使用；对5～50mm的钢—铁渣进行磁选作业，分离出5～50mm的渣铁球，供电炉使用；对5mm以下的磁选作业，分离出5mm以下的渣铁粉半成品，再进行水洗—磁选作业，分离出渣铁粉，供烧结矿配料使用。本发明处理过程均在潮湿环境中，不产生粉尘飞扬，有利于环境保护；处理设备投资较低；特别是金属资源流失量降到最低限度，扩大金属资源的利用率。

In the recovery process of slag iron balls and slag iron powder in steel-iron slag, the steel-iron slag is sprinkled with water first, and the free CaO in the steel-iron slag reacts with water to generate Ca(OH) 2 , which makes the steel-iron slag expand and loosen, and promotes Fully separate steel-iron particles and powder from slag; then sieve, after sieving, magnetically separate steel-iron slag with a particle size of 50mm or more to separate slag iron and steel products with a particle size of 50mm or more, and use it in a power supply furnace; for 5-50mm The steel-iron slag is magnetically separated to separate slag-iron balls of 5-50mm, which are used in power supply furnaces; for the magnetic separation operation below 5mm, the semi-finished slag-iron powder below 5mm is separated, and then washed-magnetic separation operation is carried out. The slag and iron powder are separated for use as sinter ingredients. The processing process of the present invention is all in a humid environment, without dust flying, which is beneficial to environmental protection; the investment in processing equipment is low; especially the loss of metal resources is reduced to a minimum, and the utilization rate of metal resources is expanded.

Description

Slag iron ball and slag iron powder reclaim technology in the steel-iron slag
Technical field
The present invention relates to waste recovery process, particularly slag iron ball and slag iron powder reclaim in the steel-iron slag of Iron And Steel Industry generation.Slag iron ball in the steel-iron slag and slag iron powder fully can be reclaimed by this method, wherein slag iron ball is used for the electric furnace batching, slag iron powder is used for the agglomerate batching.
Background technology
Steel-making is exactly to refine slag.In steelmaking process, the slag generating capacity accounts for 5～10% of output of steel, a large amount of slags that this part slag produces in including smelting process, also contains steel grit and T.Fe about 15～25%.Along with improving constantly that steel product quality requires, adopt hot metal pretreatment technology, molten iron slag skimming process, metal mixer car deslagging technology, ladle to stay steel technology in a large number at process for making.When above-mentioned process using, produce a large amount of scums that contains inevitably.Contain steel-abrasive grit of containing 5～50mm in the scum and less than the iron powder of 5mm, these steel-abrasive grits and the iron powder ratio in containing scum is between 3-5% at these.For strengthening the comprehensive utilization of slag iron and steel resource, part steel mill adopts processing mode to handle the slag iron and steel, as the alternative kind of iron and steel scrap.As adopt vexed jar of complete processing (PROCESS OFSELF-DECOMPOSITION FOR VESSEL SIAG AFTERHEAT, China Patent No.: CN 86103047) that the slag iron and steel is handled, reclaim bulk slag iron and steel.But reclaim problem for steel-abrasive grit of 5～50mm and less than the iron powder of 5mm, part steel mill adopts the magnetic separation recovery system, the abrasive grit that reclaims out, iron powder dregginess big (abrasive grit dregginess between 15～25%, the iron powder dregginess is between 40～50%) are bigger to molten steel or molten iron influence during use.Domestic have part steel mill simply not reclaim basically, contains abrasive grit, iron powder with the discarded processing of steel-iron slag do, causes the wasting of resources.
Japan's Nippon Steel granulated iron reclaims the patented technology technical process, as shown in Figure 1, at first, slag and drop hammer between-scum through the jaw crushing crusher machine (step 10), then, to broken thing magnetic separation (step 20), slag separates with metal charge; Carry out then, ballast screen branch (step 30a) sieves and is the above castaway slag of 50mm, 20-50mm castaway slag, the following castaway slag of 20mm, and is directly discarded; Metal charge screening (step 30b) is if the above metal charge of 20mm then melts down use; Otherwise then by cone crushing (step 40), through returning magnetic separation 50, rod mill crushing-magnetic selection 60, again through magnetic separation 70, screening 80, if 2-20mm granulated iron product then returns blast furnace and uses; Otherwise then by rotary drying machine oven dry (step 90), form the following fine ore of 2mm, return sinter machine.
Its granulated iron reclaims more fragmentation, screening plant and the drying plant of tooling, and investment is big (about 5,000 ten thousand yuan).The handled steel-iron slag moisture of granulated iron recovery technology is lower, and huge dust removal installation must be installed, and must strictness control the moisture content of steel-iron slag when operation, otherwise can produce bigger dust, can't discard by environmental requirement.
Summary of the invention
The object of the present invention is to provide slag iron ball and slag iron powder recovery technology in a kind of steel-iron slag, equipment is simple, invests lessly, and particularly the metals resources number of dropouts drops to bottom line, the utilization ratio of enlarged metal resource especially can fully reclaim the following metal abrasive grit of 2mm; And, in the treating processes, not producing dust from flying, the water of processing space returns use after water treatment system is handled, help environment protection.
Technical scheme of the present invention is that slag iron ball and slag iron powder reclaim technology in the steel-iron slag, comprise the steps:
A) at first to the operation of sprinkling water of slag iron and steel, keep steel-iron slag to be in moisture state all the time, utilize free CaO and water reaction in the steel-iron slag, generation Ca (OH) 2, steel-iron slag is expanded loose (whether keep the moistening time fully to expand to loosen according to steel-iron slag decides), impel steel-abrasive grit and powder fully to separate with slag.
B) at steel-abrasive grit and powder with after slag fully separates, steel-iron slag is sieved, screening aperture 50mm, 5mm, sieve out that 50mm is above, 5～50mm, less than the steel-iron slag of 5mm grade.
C) steel-iron slag to the above grade of 50mm carries out magnetic concentration working, isolates the above slag steel products (dregginess can reach below 7%) of 50mm, uses as slag iron power supply stove;
D) steel-iron slag to 5～50mm carries out magnetic concentration working, isolates the slag iron ball (dregginess can reach below 10%) of 5～50mm, and power supply stove uses;
E) steel-iron slag below the 5mm is carried out magnetic concentration working, isolate the following slag iron powder work in-process (dregginess reaches 35～45%) of 5mm, wash again-magnetic concentration working, isolate slag iron powder (dregginess reaches 7～15%, metal Ferrum content between 45～55%, all iron content is 70～85%), use for the agglomerate batching.
Beneficial effect of the present invention
Steel-iron slag of the present invention is handled, the course of processing all in wet environment, does not produce dust from flying, and the processing water returns use after water treatment system is handled, help environment protection; Employed treatment facility investment is lower; Particularly the metals resources number of dropouts drops to bottom line, the utilization ratio of enlarged metal resource.
Description of drawings
Fig. 1 reclaims the schema of technology for existing steel-iron slag.
Fig. 2 is a schema of the present invention.
Embodiment
Referring to Fig. 2, slag iron ball and slag iron powder reclaim technology in the steel-iron slag of the present invention, comprise the steps:
At first,, keep steel-iron slag to be in moisture state all the time, utilize free CaO and water reaction in the steel-iron slag, generation Ca (OH) the operation of sprinkling water of slag iron and steel 2, steel-iron slag is expanded loose (whether keep the moistening time fully to expand to loosen according to steel-iron slag decides), impel steel-abrasive grit and powder fully to separate step 100 with slag;
With after slag fully separates, steel-iron slag is sieved (step 200) at steel-abrasive grit and powder, screening aperture 50mm, 5mm, sieve out that 50mm is above, 5～50mm, less than the steel-iron slag of 5mm grade;
Steel-iron slag to the above grade of 50mm carries out magnetic concentration working (step 300), isolates the above slag steel products (dregginess can reach below 7%) of 50mm, uses as slag iron power supply stove;
Steel-iron slag to 5～50mm carries out magnetic concentration working, isolates the slag iron ball (dregginess can reach below 10%) of 5～50mm, and power supply stove uses;
Steel-iron slag below the 5mm is carried out magnetic concentration working, isolate the following slag iron powder work in-process (dregginess reaches 35～45%) of 5mm, wash again-magnetic concentration working (step 400), isolate slag iron powder (dregginess reaches 7～15%, metal Ferrum content between 45～55%, all iron content is 70～85%), use for the agglomerate batching.
The slag that obtains after the magnetic separation in the said process is made waste residue and is handled (step 500);
It is 25～300,000 tons/year that company of Baogang Stocks Trading Co. contains the scum generating capacity, its metal Ferrum content between 15～20%, about 3～40,000 tons of recyclable slag iron ball and slag iron powder.Not adopting when of the present invention this part metallic iron externally to handle at a low price, cause the wasting of resources with steel-iron slag.
After adopting the present invention, reclaim a large amount of slag iron ball and slag iron powder from steel-iron slag, open up electric furnace and used slag iron ball, agglomerate batching to use the precedent of slag iron powder, enlarged metals resources utilization ratio in the factory (seeing Table 1).Table 1: slag iron ball, slag iron powder usage quantity over the years
Table 1
Title 2002 2003 The 1-2 month in 2004 Add up to
Slag iron ball (ton) 31455.96 27296.83 6648.8 65401.59
Slag iron powder (ton) 0 5599.74 1432.46 7032.2
Steel-iron slag is after by art breading of the present invention, and the dregginess of slag iron ball reaches below 10%, and overall sulphur content is between 0.080～0.100%.But eaf process adopts the stream slag operation, and sulphur content is less to the steel quality influence, and furnaceman's LF skill has good desulfurization condition, uses the molten steel of slag iron ball can reach the quality level of using steel scrap after electric furnace+LF stove is handled.Slag iron powder is on quality index, and its sulphur, phosphorus content are higher than iron ore (seeing Table 2), but proportion scale only is 0.2～0.3%, and quality influence can be ignored.
Table 2: slag iron powder typical case composition value (%)
Project M.Fe T.Fe CaO SiO 2 Al 2O 3 MgO MnO S P
Slag iron powder 1 52.1 82.14 4.17 1.47 0.29 1.09 0.42 0.045 0.097
Slag iron powder 2 45.2 76.51 4.58 4.26 1.39 0.77 0.47 0.102 0.079
After adopting the present invention, reach 0.88 ten thousand ton of 6.54 ten thousand ton, iron ore for reducing outsourcing steel scrap amount in 2002～2004 years, have tangible economic benefit (seeing Table 3).
Table 3: the slag iron and steel uses relatively
Project Quantity Cost price Economic benefit
Ton Unit/ton Ten thousand yuan
2002-added up in 2004 Slag iron ball 65401 -503
Slag iron powder 7032 -54
Reduce the steel scrap amount of purchase 65401 9199
Reduce the iron ore amount of purchase 8790 259
Add up to 8901
Reclaim slag iron ball, slag iron powder technology by steel-iron slag of the present invention, the metals resources number of dropouts is dropped to bottom line, the utilization ratio of enlarged metal resource.According to present use actual achievement, the abrasive grit that contains in the steel-iron slag, the utilization ratio of iron powder can reach more than 80%, process 7032 tons of slag iron ball more than 6.5 ten thousand tons, slag iron powders altogether from October, 2002.These products all have been used for electric furnace, the agglomerate batching is used, and have successfully substituted outsourcing steel scrap, iron ore.

Claims (5)

1.钢-铁渣中渣铁球及渣铁粉回收工艺，其特征是，包括如下步骤：1. The recovery process of slag iron balls and slag iron powder in steel-iron slag is characterized in that it comprises the following steps: a)首先对渣钢铁进行洒水作业，保持钢-铁渣始终处在湿润状态，利用钢-铁渣中的游离CaO与水反应，生成Ca(OH)2，使钢-铁渣膨胀疏松，促使钢-铁粒及粉与渣分离；a) First, sprinkle water on the slag and steel, keep the steel-iron slag in a wet state, use the free CaO in the steel-iron slag to react with water to generate Ca(OH) 2 , make the steel-iron slag expand and loosen, and promote Separation of steel-iron particles and powder from slag; b)在钢-铁粒及粉与渣分离后，对钢-铁渣进行筛分，筛分孔径50mm、5mm，筛分出50mm以上、5～50mm、小于5mm粒级的钢-铁渣；b) After the steel-iron particles and powder are separated from the slag, the steel-iron slag is screened with a sieving aperture of 50mm and 5mm, and the steel-iron slag with a particle size of more than 50mm, 5-50mm, and less than 5mm is screened out; c)对50mm以上粒级的钢-铁渣进行磁选作业，分离出50mm以上的渣钢铁产品，作为渣铁供电炉使用；c) Carry out magnetic separation operation on the steel-iron slag with a particle size of more than 50mm, separate the slag iron and steel products with a size of more than 50mm, and use it as a slag-iron power supply furnace; d)对5～50mm的钢-铁渣进行磁选作业，分离出5～50mm的渣铁球，供电炉使用；d) Perform magnetic separation on 5-50mm steel-iron slag to separate 5-50mm slag-iron balls for use in power supply furnaces; e)对5mm以下的钢-铁渣进行磁选作业，分离出5mm以下的渣铁粉半成品，再进行水洗-磁选作业，分离出渣铁粉，供烧结矿配料使用。e) Carry out magnetic separation operation on the steel-iron slag below 5mm, separate the semi-finished slag iron powder below 5mm, and then carry out water washing-magnetic separation operation, separate the slag iron powder for use in sintering ore batching. 2.如权利要求1所述的钢-铁渣中渣铁球及渣铁粉回收工艺，其特征是，渣钢铁产品的含渣量达到7％以下。2. The process for recovering slag-iron balls and slag-iron powder in steel-iron slag as claimed in claim 1, characterized in that the slag content of slag iron and steel products reaches below 7%. 3.如权利要求1所述的钢-铁渣中渣铁球及渣铁粉回收工艺，其特征是，渣铁球含渣量达到10％以下。3. The process for recovering slag-iron balls and slag-iron powder in steel-iron slag as claimed in claim 1, characterized in that the slag content of the slag-iron balls reaches below 10%. 4.如权利要求1所述的钢-铁渣中渣铁球及渣铁粉回收工艺，其特征是，渣铁粉半成品含渣量达到35～45％。4. The process for recovering slag-iron balls and slag-iron powder in steel-iron slag as claimed in claim 1, characterized in that the slag content of the semi-finished product of slag-iron powder reaches 35-45%. 5.如权利要求1所述的钢-铁渣中渣铁球及渣铁粉回收工艺，其特征是，渣铁粉含渣量达到7～15％、金属铁含量在45～55％之间、全铁含量在70～85％。5. The process for recovering slag-iron balls and slag-iron powder in steel-iron slag as claimed in claim 1, characterized in that the slag content of the slag-iron powder reaches 7-15%, and the metal iron content is between 45-55% , The total iron content is 70-85%.
CNB2004100541282A 2004-08-30 2004-08-30 Process for recovering slag iron ball and slag iron powder from steel-iron slag Expired - Lifetime CN1313625C (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103374635B (en) * 2012-04-16 2015-03-11 攀钢集团攀枝花钢铁研究院有限公司 Blast furnace slag recycling method
CN102978305B (en) * 2012-12-15 2014-12-17 武钢集团昆明钢铁股份有限公司 Molten steel casting residue treatment and recycling method
CN103537366B (en) * 2013-11-12 2015-10-28 攀枝花环业冶金渣开发有限责任公司 The method of high grade iron is reclaimed from blast furnace dry slag
CN104531921A (en) * 2014-11-25 2015-04-22 南通新正大特钢有限公司 Production method for separating special steel smelting slag
TWI607092B (en) * 2017-04-06 2017-12-01 Slag processing method
CN116673308A (en) * 2023-05-22 2023-09-01 攀枝花钢城集团有限公司 Method for obtaining steel slag with different activities

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Publication number Priority date Publication date Assignee Title
JPH06281363A (en) * 1993-03-30 1994-10-07 Nippon Steel Corp Iron recovery method for steelmaking slag and slag recycling method and device

Patent Citations (1)

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Publication number Priority date Publication date Assignee Title
JPH06281363A (en) * 1993-03-30 1994-10-07 Nippon Steel Corp Iron recovery method for steelmaking slag and slag recycling method and device

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钢渣加工工艺的现状与发展 毕琳，矿产综合利用，第3期 1999 *
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