CN103014196A - Application method of blast furnace slag fine stuff - Google Patents
Application method of blast furnace slag fine stuff Download PDFInfo
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- CN103014196A CN103014196A CN201210574350XA CN201210574350A CN103014196A CN 103014196 A CN103014196 A CN 103014196A CN 201210574350X A CN201210574350X A CN 201210574350XA CN 201210574350 A CN201210574350 A CN 201210574350A CN 103014196 A CN103014196 A CN 103014196A
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- blast furnace
- furnace slag
- iron
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- reducing agent
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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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
Abstract
The invention discloses an application method of blast furnace slag fine stuff, belonging to the field of waste resource recycling technology. The method comprises the steps of sequentially conducting fine grinding, magnetic separation, classification and reselection to the blast furnace slag fine stuff through a ball mill so as to enrich metal iron and obtain more than 95% of amount of iron powder reducing agent with more than 85% of metal iron grade, grain size of 40 meshes below. The iron powder reducing agent can be directly used as reducing agent for producing titanium dioxide. Tailings obtained after the blast furnace slag fine stuff is subjected to magnetic separation, classification and reselection can be used for producing pelletizing and returning in an ironmaking blast furnace for use, without generation of other secondary pollution, and water in the technique process can also be recycled, so that the energy consumption is low. Due to the advantages of being even in particle size, stable in grade, low in impurity content and the like, the reducing agent obtained by using the method is fast in reaction speed, and fewer in produced impurities in using process, thereby being a desirable reducing agent for producing titanium dioxide.
Description
Technical field
The invention belongs to waste resource reutilization technology field, be specifically related to a kind of application method of blast furnace slag fines.
Background technology
The slag annual production that produces in the blast furnace iron manufacturing process can be about 2% from the slag iron of wherein direct magnetic separation recovery about 3,500,000 tons, annual recyclable slag iron is 100,000 tons at present.Wherein dry slag (has another name called air cooling slag, hot splashing slag.Build partition wall by laying bricks or stones from terrace to table height before blast furnace, formation is sprinkled pit, flows in the hole through slag runner after slag is come out of the stove, and sprawls into thick approximately 15 centimetres thin layer, and water spray cools off, and excavates after solidifying to obtain.) can make the slag iron of different grades through techniques such as fragmentation, magnetic separation, ball millings, wherein about 50% slag iron exists with ball milling magnetic separation form, and this ball milling magnetic separation is called the blast furnace slag fines.Iron in the blast furnace slag fines product mainly is embedded in particulate state and forms cinder ladle iron in the slag, and iron is " dispersion " " thin real " feature in the slag, slag iron may be separated.The blast furnace slag fines mainly returns to iron-smelting blast furnace as the blast furnace sinter raw material at present.In the process of melting down, TFe further reduces, for next process performs the basis, but the inside metal Fe just carried out again reduction, when smelting iron, will produce a large amount of wastes again, produce new pollution.
Technique with Titanium White Production By Sulfuric Acid Process is: pulverizing, acidolysis, leaching, reduction, sedimentation, crystallization, crystal separation, titanium liquid are concentrated, hydrolysis, filtration washing, salt are processed, filtered calcining and pack etc., the operation of wherein reducing just needs to use reductive agent, usually the used reductive agent of titanium white production mainly is the ferric charges such as iron filings, steel scrap and cast iron, the reductive agent speed of response of traditional technology is slow, impurity is many, thereby to use traditional reductive agent usage quantity to reach 15%(be that one ton of titanium dioxide of every production needs 150Kg to contain iron powder).And use the reduction iron powder, and owing to fine size, of high grade, foreign matter content is few, thereby reaching reduction more than 95% with-0.45mm, to make the reductive agent speed of response with iron powder fast, and consumption is few, and usage quantity can drop to 10% by former 15%.
Summary of the invention
Technical problem to be solved by this invention provides the new application method of a kind of blast furnace slag fines.
The technical solution adopted for the present invention to solve the technical problems is: the application method of blast furnace slag fines, with the blast furnace slag fines successively through ball mill fine grinding, magnetic separation, classification and gravity treatment, thereby enriched in metals iron, obtain the metallic iron grade greater than 85%, the amount of granularity below 40 orders be greater than 95% iron powder reducing agent.
Wherein, the agent of iron powder reducing described in the aforesaid method is directly as the titanium white production reductive agent.
Wherein, the mine tailing that the blast furnace slag fines obtains after magnetic separation, classification and gravity treatment in the aforesaid method returns iron-smelting blast furnace for the production of pelletizing and uses.
Wherein, the metal Fe grade of the fines of blast furnace slag described in the aforesaid method is 40～60%, and blast furnace slag fines granularity is less than 8mm.
Wherein, ball mill described in the aforesaid method is wet overflow type ball mill.
Further, the model of described wet overflow type ball mill is MQG1500 * 4500, and steel ball matching is Φ 120 ︰ Φ 90 ︰ Φ 60 ︰ Φ 40=4 ︰ 3 ︰ 2 ︰ 1.
Wherein, the equipment that magnetic separation is selected in the aforesaid method is wet type half counter-current magnetic separator, magneticstrength 1000～1200Oe.
Wherein, the equipment that gravity treatment is adopted in the aforesaid method is cloud tin formula 6S fine sand oscillating table.
The invention has the beneficial effects as follows: the blast furnace slag fines is because foreign matter content is many, substantially all be used as the blast furnace sinter raw material and return to the iron-smelting blast furnace use, the present invention carries out fine grinding successively with the blast furnace slag fines, magnetic separation, classification and gravity treatment, can effectively the impurity in the blast furnace slag fines be separated with metallic iron, thereby significantly improve the grade of metallic iron, metallic iron in the blast furnace slag fines is rationally utilized, obtain the metallic iron grade greater than 85%, the amount of granularity below 40 orders is greater than 95% iron powder reducing agent, if transposing magnetic separation, the order of classification and gravity treatment, the one, unreasonable to the layout of device processes ability, the 2nd, grade and the rate of recovery of the final metallic iron of impact, will reduce grade and the rate of recovery of metallic iron in the iron powder reducing agent such as the order of having changed magnetic separation and classification: grade reduces about 5.00%, the rate of recovery reduces about 3.00%, also can increase simultaneously the processing power of grading machine.Choose reasonable ball mill of the present invention, magnetic separator and gravitational separation equipment the metallic iron grade not only can be brought up to more than 85%, and the rate of recovery of metallic iron are high, can reach more than 86.00%.The present invention is pure physical method, and the mine tailing that produces can directly return the iron-smelting blast furnace use as producing pelletizing, does not produce other waste products or secondary pollution, and the water in the technological process can recycle, and energy consumption is low.The reductive agent that the present invention obtains can be directly as the reductive agent in the production process of titanium pigment, and owing to advantages such as epigranular, grade are stablized, foreign matter content is low, in use speed of response is fast, and the impurity of generation is few, is the desirable reductive agent of titanium white production.
Embodiment
Now the present invention will be described by embodiment.
The application method of blast furnace slag fines of the present invention, with the blast furnace slag fines successively through ball mill fine grinding, magnetic separation, classification and gravity treatment, thereby enriched in metals iron, obtain the metallic iron grade greater than 85%, the amount of granularity below 40 orders be greater than 95% iron powder reducing agent.The present invention processes the blast furnace slag fines successively by fine grinding, magnetic separation, classification and gravity separation technology, can access the metallic iron grade greater than 85%, the amount of granularity below 40 orders be greater than 95% iron powder reducing agent, satisfy the requirement as the iron powder of reductive agent, be specially adapted to the titanium white production reductive agent, speed of response is fast, the impurity that produces is few, and therefore, the iron powder reducing agent that preferably aforesaid method is obtained is directly as the titanium white production reductive agent.
Preferably, in the aforesaid method in the mine tailing that magnetic separation, classification and gravity treatment produce TFe content higher, can also be used for pellet formation, therefore, the mine tailing that preferably the blast furnace slag fines is obtained after magnetic separation, classification and gravity treatment in the aforesaid method returns iron-smelting blast furnace for the production of pelletizing and uses.
Preferably, the metal Fe grade of the fines of blast furnace slag described in the aforesaid method is 40～60%, and blast furnace slag fines granularity is less than 8mm.
Preferably, in order further to improve the rate of recovery and the grade of metallic iron of the present invention, ball mill described in the aforesaid method is wet overflow type ball mill.
Further, iron in the blast furnace slag fines mainly is embedded in particulate state and forms cinder ladle iron in the slag, iron is " dispersion " " thin real " feature in the slag, the slag of this granularity and grade can separate its slag iron by ball milling, magnetic separation, characteristics for the blast furnace slag fines, the model of preferred described wet overflow type ball mill is MQG1500 * 4500, and steel ball matching is Φ 120 ︰ Φ 90 ︰ Φ 60 ︰ Φ 40=4 ︰ 3 ︰ 2 ︰ 1.
Preferably, in order further to improve the rate of recovery and the grade of metallic iron of the present invention, the equipment that magnetic separation is selected in the aforesaid method is wet type half counter-current magnetic separator, magneticstrength 1000～1200Oe.
Preferably, in order further to improve the rate of recovery and the grade of metallic iron of the present invention, the equipment that gravity treatment is adopted in the aforesaid method is cloud tin formula 6S fine sand oscillating table.
Below by embodiment the specific embodiment of the present invention is further described, but therefore protection scope of the present invention is not limited among the embodiment.
Embodiment one
85.34 tons of blast furnace slag fineves, metal Fe grade 54.37%, all below 8mm, wherein-100 purpose 39.85% for moisture content 6.29%, all raw materials.All other chemical index see the following form 1, and size indicator sees Table 2:
Table 1 blast furnace slag fines Chemical Composition
| Index | TFe | C | S | P | V | Cr | Mn | Cu | Ni |
| Content % | 61.35 | 0.95 | 0.02 | 0.05 | 0.34 | 0.07 | 0.24 | 0.09 | 0.03 |
The size-grade distribution of table 2 blast furnace slag fines
| Project | -8mm~+1mm | -1mm ~+40 orders | -40 orders ~+100 orders | -100 orders |
| Distribution situation | 28.363 | 17.08 | 14.707 | 39.85 |
This blast furnace slag fines, ratio of water to material carries out blanking by 0.6:1, by MQG1500 * 3000 ball mills, MQG1200 * 2400 ball mills series connection ball milling, behind the ball milling, granularity-40 purpose 94.53%, pass through CTB600 * 1200 magnetic separators (magneticstrength 1000Oe) magnetic separation, the metallic iron grade reaches 78.33% again, passes through FC500 * 4800 grading machine classifications again, the metallic iron grade just reaches 81.35%, then be assigned on four detin 6S fine sand oscillating tables by divider, by the shaking table tossing, wet concentrate grade out is 87.95%, again wet concentrate is toasted, what baking was mainly adopted is that the inner Baking cylinder toasts, owing to when baking dust removal installation being arranged, some fine impurity of the inside is removed, the ferrous metal iron grade that bakes reaches 89.98%, the rate of recovery of metallic iron reaches 87.02%, and granularity-40 order reaches 99.53%, packs by selective examination, every 25kg one pouch, 40 pouches, one large bag is one ton, produces altogether 42.05 tons of iron powders, then delivers to certain titanium powder plant and tests.The reduction operation that is mainly used in titanium white production is made reductive agent, add in the reduction tank and carry out reduction reaction, three tests (three days have in succession been done altogether, the carrying out of day shift every day), use altogether 29.111 tons of iron powders, produced altogether 300 tons of titanium dioxides, one ton of titanium dioxide of average every production consumes the 97.03kg iron powder, speed of response is very fast in adding the process of iron powder, and finds in the settling process that impurity obviously lacks when using steel scrap.
In this reduction process, mainly be that high price iron is reduced into ferrous iron.Concrete reactional equation is as follows:
Fe
2(SO
4)
3+Fe=3FeSO
4
In order to guarantee that the ferric iron Restore All is ferrous iron in the solution, reduction reaction is slightly excessive, and just have a small amount of titanic to be reduced to titanous in the solution this moment, by detecting the existence of titanous, can guarantee the ferric iron reduction fully.Because ferric iron is reduced to first ferrous iron in reaction, and then be that titanic is reduced to titanous.
Embodiment two
125 tons of blast furnace slag fineves, metal Fe grade 52.14%, all below 8mm, wherein-100 purpose 43.85% for moisture content 5.34%, all raw materials.
This blast furnace slag fines, ratio of water to material carries out blanking by 0.6:1, by MQG1500 * 4500 ball mill ball millings, behind the ball milling, granularity-40 purpose 92.15%, pass through again CTB600 * 1200 magnetic separators (magneticstrength 1000Oe) magnetic separation, the metallic iron grade reaches 75.64%, passes through FC500 * 4800 grading machine classifications again, and the metallic iron grade just reaches 80.56%, then be assigned on four detin 6S fine sand oscillating tables by divider, by the shaking table tossing, wet concentrate grade out is 86.54%, wet concentrate is toasted again, what baking was mainly adopted is that the inner Baking cylinder toasts, owing to when baking, dust removal installation being arranged, some fine impurity of the inside to be removed, the ferrous metal iron grade that bakes reaches 88.17%, the rate of recovery of metallic iron reaches 86.89%, pack by selective examination, every 25kg one pouch, 40 pouches, one large bag is one ton, produce altogether 58 tons of iron powders, then deliver to certain titanium powder plant and test.The reduction operation that is mainly used in titanium white production is made reductive agent, add in the reduction tank and carry out reduction reaction, three tests (three days have in succession been done altogether, the carrying out of day shift every day), use altogether 29.628 tons of iron powders, produced altogether 300 tons of titanium dioxides, one ton of titanium dioxide of average every production consumes the 98.76kg iron powder, speed of response is very fast in adding the process of iron powder, and finds in the settling process that impurity obviously lacks when using steel scrap.
In this reduction process, mainly be that high price iron is reduced into ferrous iron.Concrete reactional equation is as follows:
Fe
2(SO
4)
3+Fe=3FeSO
4
In order to guarantee that the ferric iron Restore All is ferrous iron in the solution, reduction reaction is slightly excessive, and just have a small amount of titanic to be reduced to titanous in the solution this moment, by detecting the existence of titanous, can guarantee the ferric iron reduction fully.Because ferric iron is reduced to first ferrous iron in reaction, and then be that titanic is reduced to titanous.
Claims (7)
1. the application method of blast furnace slag fines, it is characterized in that: with the blast furnace slag fines successively through ball mill fine grinding, magnetic separation, classification and gravity treatment, thereby enriched in metals iron, obtain the metallic iron grade greater than 85%, the amount of granularity below 40 orders be greater than 95% iron powder reducing agent.
2. the application method of blast furnace slag fines according to claim 1 is characterized in that: described iron powder reducing agent is directly as the titanium white production reductive agent.
3. the application method of blast furnace slag fines according to claim 1 is characterized in that: the mine tailing that the blast furnace slag fines obtains after magnetic separation, classification and gravity treatment returns iron-smelting blast furnace for the production of pelletizing and uses.
4. according to claim 1, the application method of 2 or 3 described blast furnace slag fineves, it is characterized in that: the metal Fe grade of described blast furnace slag fines is 40～60%, and blast furnace slag fines granularity is less than 8mm.
5. according to claim 1, the application method of 2 or 3 described blast furnace slag fineves, it is characterized in that: described ball mill is wet overflow type ball mill.
6. according to claim 1, the application method of 2 or 3 described blast furnace slag fineves, it is characterized in that: the equipment that magnetic separation is selected is wet type half counter-current magnetic separator, magneticstrength 1000～1200Oe.
7. according to claim 1, the application method of 2 or 3 described blast furnace slag fineves, it is characterized in that: the equipment that gravity treatment is adopted is cloud tin formula 6S fine sand oscillating table.
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| CN201210574350XA CN103014196A (en) | 2012-12-26 | 2012-12-26 | Application method of blast furnace slag fine stuff |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103721845A (en) * | 2013-12-27 | 2014-04-16 | 李鑫杰 | Method for separating and extracting zero-valent iron from fire-smelted iron-containing waste residue |
| CN104498708A (en) * | 2014-12-09 | 2015-04-08 | 攀枝花环业冶金渣开发有限责任公司 | Pellets prepared from blast furnace slag iron fine powder as well as preparation method and application of pellets |
| CN105478215A (en) * | 2015-12-14 | 2016-04-13 | 攀枝花钢城集团有限公司 | Beneficiation method for steel slag tailings |
| CN109277184A (en) * | 2018-12-03 | 2019-01-29 | 攀枝花环业冶金渣开发有限责任公司 | The method of enriched iron from low iron metallurgical slag |
| CN112410481A (en) * | 2020-10-29 | 2021-02-26 | 攀枝花环业冶金渣开发有限责任公司 | Method for preparing hot-pressed blocks from low-grade iron and high-titanium blast furnace slag |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4747547A (en) * | 1986-06-11 | 1988-05-31 | Nippon Jiryoku Senko Co., Ltd. | Process for the treatment of slag generated in an ironworks |
| CN101229526A (en) * | 2007-12-13 | 2008-07-30 | 攀枝花环业冶金渣开发有限责任公司 | Method of using blast furnace scrap iron in slag to prepare puron materiel |
| CN102492851A (en) * | 2011-12-29 | 2012-06-13 | 攀枝花钢城集团有限公司 | Method for smelting and extracting zinc tailings by recovery method |
| CN102688880A (en) * | 2012-06-18 | 2012-09-26 | 武汉市天沭科技发展有限公司 | Method for efficiently recovering and reselecting steel slag |
-
2012
- 2012-12-26 CN CN201210574350XA patent/CN103014196A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4747547A (en) * | 1986-06-11 | 1988-05-31 | Nippon Jiryoku Senko Co., Ltd. | Process for the treatment of slag generated in an ironworks |
| CN101229526A (en) * | 2007-12-13 | 2008-07-30 | 攀枝花环业冶金渣开发有限责任公司 | Method of using blast furnace scrap iron in slag to prepare puron materiel |
| CN102492851A (en) * | 2011-12-29 | 2012-06-13 | 攀枝花钢城集团有限公司 | Method for smelting and extracting zinc tailings by recovery method |
| CN102688880A (en) * | 2012-06-18 | 2012-09-26 | 武汉市天沭科技发展有限公司 | Method for efficiently recovering and reselecting steel slag |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103721845A (en) * | 2013-12-27 | 2014-04-16 | 李鑫杰 | Method for separating and extracting zero-valent iron from fire-smelted iron-containing waste residue |
| CN104498708A (en) * | 2014-12-09 | 2015-04-08 | 攀枝花环业冶金渣开发有限责任公司 | Pellets prepared from blast furnace slag iron fine powder as well as preparation method and application of pellets |
| CN105478215A (en) * | 2015-12-14 | 2016-04-13 | 攀枝花钢城集团有限公司 | Beneficiation method for steel slag tailings |
| CN109277184A (en) * | 2018-12-03 | 2019-01-29 | 攀枝花环业冶金渣开发有限责任公司 | The method of enriched iron from low iron metallurgical slag |
| CN112410481A (en) * | 2020-10-29 | 2021-02-26 | 攀枝花环业冶金渣开发有限责任公司 | Method for preparing hot-pressed blocks from low-grade iron and high-titanium blast furnace slag |
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Application publication date: 20130403 |