CN100386446C - Method of high efficiency recovering iron from slag - Google Patents
Method of high efficiency recovering iron from slag Download PDFInfo
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- CN100386446C CN100386446C CNB2005100190238A CN200510019023A CN100386446C CN 100386446 C CN100386446 C CN 100386446C CN B2005100190238 A CNB2005100190238 A CN B2005100190238A CN 200510019023 A CN200510019023 A CN 200510019023A CN 100386446 C CN100386446 C CN 100386446C
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Abstract
The present invention relates to a method for recovering iron from steel slag. The method for recovering iron from steel slag with high efficiency is characterized in that the method comprises the following steps: iron removal for the first time: an electromagnetic chuck is used for removing the iron of the steel slag after being discharged and cooled for the first time, and a jaw breaker is used for breakage for the first time; iron removal for the second time: an electric magnetic iron remover is used for iron removal for the second time, and an impact breaker is used for breakage for the second time; iron removal for the third time: the electric magnetic iron remover is used for iron removal for the third time, and a pole grinding machine is used for breakage for the third time; iron removal for the fourth time: the electric magnetic iron remover is used for iron removal for the fourth time, and a rod grinding machine is used for breakage for the fourth time; iron removal for the fifth time: the electric magnetic iron remover is used for iron removal for the fifth time, and the steel slag is sent to a steel slag tube grinding machine to be milled; iron removal for the sixth time: through increasing an iron removing system at a grinding tail of the steel slag tube grinding machine, iron powder in steel slag mineral powder is removed. The present invention can reduce an iron content in the steel slag to 0.30 to 0.05% from 13% to 15%.
Description
Technical field
The invention belongs to building material field, be specifically related to a kind of method that is used for reclaiming iron from slag.
Background technology
Slag is the waste residue that Steel industry produces, and its quantity discharged is about about 10% of output of steel, and the year generation of China's slag has reached more than 1,600 ten thousand tons at present.Iron-holder reaches 13%-15% in the slag, and iron level has reached more than 2,000,000 tons in the slag of annual Iron And Steel Industry discharging, calculates according to current iron ore 700-1000 unit/ton, and annual iron material total value of leaving unused will be above 14,000,000,000 Renminbi.Slag iron-holder height if the iron in the slag can not effectively be removed, has not only increased the difficulty of slag crushing and grinding, influences the quality of slag breeze product, but also causes the waste of a large amount of iron materials.Current, the iron ore resource anxiety is under the situation that price remains high, adopt the iron of economical rationality to reclaim technology, iron in the slag is turned waste into wealth, not only significant for the Sustainable development that realizes China's iron and steel and building materials, but also can obtain very remarkable economic efficiency.
The at present normal slag deferrization process that adopts is seen Fig. 1, adopts in the slag breeze that this explained hereafter comes out iron-holder usually at 2-4%, and sometimes even reach more than 5%, the efficient that reclaims iron is not high.
Summary of the invention
The object of the present invention is to provide a kind of method that from slag, reclaims iron, can make iron-holder in the slag by 13%-15% to 0.30-0.05%, iron is reclaimed the organic efficiency height.
To achieve these goals, technical scheme of the present invention is: reclaim the method for iron from slag, it is characterized in that comprising the steps:
Reclaim iron the 1st time: adopt magneticchuck that the cooled steel slag of coming out of the stove is carried out reclaiming the first time iron, the slag piece behind the recovery iron enters the particle that jaw crusher carries out being broken into for the first time particle diameter 30-40mm;
Reclaim iron the 2nd time: the steel slag particle after the fragmentation first time enters the 2nd time and reclaims iron, and the 2nd time recovery iron adopts the electric magnetic iron remover deironing; The slag that reclaims for the 2nd time behind the iron adopts impact crusher to carry out the fragmentation second time, and the slag particle diameter is reduced to below the 10mm;
Reclaim iron the 3rd time: the steel slag particle after the fragmentation second time carries out No. the 3rd electric magnetic iron remover and reclaims iron; The slag that reclaims for the 3rd time behind the iron adopts column mill to carry out fragmentation for the third time, and the slag particle diameter is reduced to below the 5mm;
The 4th reclaims iron: the steel slag particle after fragmentation for the third time carries out the 4th electric magnetic iron remover and reclaims iron; The slag that the 4th reclaims behind the iron adopts rod mill to carry out the 4th fragmentation, and the slag particle diameter is reduced to 1-2mm;
The 5th reclaims iron: the steel slag particle after the 4th fragmentation carries out the 5th electric magnetic iron remover and reclaims iron, and the 5th reclaims slag behind the iron and sends in the slag tuber grinder grinding to specific surface area 450m
2More than/the kg;
Reclaim iron the 6th time:
Any that slag breeze behind the grinding is adopted following four kinds of technologies carries out the 6th time and reclaims iron, and the metal Ferrum content that obtains slag breeze is reduced to below the 0.05%-0.3%;
(1). increase 1-2 settling pocket and 1 cover centrifugal classifier or cyclone type powder sorting machine or O-SEPA high-efficient powder concentrator successively at slag tuber grinder afterbody, slag breeze is carried out iron powder reclaim;
(2). increase by 1 cover electromagnetism equipment for removing ferric ion and 1 cover centrifugal classifier or cyclone type powder sorting machine or O-SEPA high-efficient powder concentrator successively at slag tuber grinder afterbody, slag breeze is carried out iron powder reclaim;
(3). increase by 1 settling pocket and 1 cover electromagnetism equipment for removing ferric ion successively at slag tuber grinder afterbody, slag breeze is carried out iron powder reclaim;
(4). increase by 1 settling pocket, 1 cover electromagnetism equipment for removing ferric ion and 1 cover centrifugal classifier or cyclone type powder sorting machine or O-SEPA high-efficient powder concentrator successively at slag tuber grinder afterbody, slag breeze is carried out iron powder reclaim.
The characteristics of natural sedimentation are less investments, and power consumption is little, and are more effective greater than the crude iron particle of 0.1mm to particle diameter, but iron organic efficiency 10-20% only; Powder separating machine is more effective at the iron particle of 0.05-0.2mm for the separating particles particle diameter, and the iron powder organic efficiency can reach 50%-60%, but invests relatively largely, and power consumption is higher, and the iron particle is more little, and it is high more to separate power consumption; Therefore, too thin as fruit granule, adopt the effect of powder separating machine just limited; The advantage of electromagnetism deironing is all effective for the iron powder of any particle diameter, the organic efficiency height; But shortcoming is the power consumption height, and the iron particle that reclaims is big more, and power consumption is just high more.Therefore, the present invention will use above three kinds of technologies according to iron level in the slag breeze and the collocation of grain thickness situation, to reduce cost recovery, improves organic efficiency.
The present invention reclaims technology by adopt 6 road iron in slag crushing and grinding process, makes the iron-holder in the slag be reduced to 0.05-0.3% by 13%-15%.The iron that reclaims can be used as iron-smelting raw material and utilizes, and the content reduction of iron helps slag levigate, reduces the grinding energy consumption, improves the quality of slag breeze, and overall economic benefit is good.
Description of drawings
Fig. 1 is existing slag deferrization process schema
Fig. 2 is that iron of the present invention reclaims the composite technology schema
Fig. 3 is that the iron powder of the embodiment of the invention 1 reclaims process flow sheet
Fig. 4 is that the iron powder of the embodiment of the invention 2 reclaims process flow sheet
Fig. 5 is that the iron powder of the embodiment of the invention 3 reclaims process flow sheet
Fig. 6 is that the iron powder of the embodiment of the invention 4 reclaims process flow sheet
Embodiment
Embodiment 1:
As Fig. 2, shown in Figure 3, from slag, reclaim the method for iron, comprise the steps:
Reclaim iron the 1st time:
Adopt magneticchuck that the cooled steel slag of coming out of the stove is carried out reclaiming the first time iron, the bulk slag is after the first time, magneticchuck was got iron, and the bulk metal iron that is not wrapping in the slag piece is removed, and iron-holder is reduced to 6%-8% by initial 13%-15%; The slag piece that reclaims the first time behind the iron enters the particle that jaw crusher carries out being broken into for the first time particle diameter 30-40mm.
Reclaim iron the 2nd time:
Steel slag particle after the fragmentation first time enters the 2nd time and reclaims iron, and the 2nd time recovery iron adopts electric magnetic iron remover to get iron, and iron-holder is reduced to 5%-6% by 6%-8%; The slag that reclaims for the 2nd time behind the iron adopts impact crusher to carry out the fragmentation second time, and the slag particle diameter is reduced to below the 10mm.
Reclaim iron the 3rd time:
Steel slag particle after the fragmentation second time carries out No. the 3rd electric magnetic iron remover and reclaims iron, and iron-holder is reduced to 3%-4% by 5%-6%; Slag after the 3rd deironing adopts column mill to carry out pre-for the third time grinding, and the slag particle diameter is reduced to below the 5mm.
The 4th reclaims iron:
Steel slag particle after fragmentation for the third time carries out the 4th electric magnetic iron remover and reclaims iron, and iron level can be reduced to 2%-3%; The slag that the 4th reclaims behind the iron adopts rod mill to carry out the 4th fragmentation, and the slag particle diameter is reduced to 1-2mm.
The 5th reclaims iron:
Steel slag particle after the 4th fragmentation carries out the 5th electric magnetic iron remover and reclaims iron; No. 5 electric magnetic iron removers of slag experience reclaim after the iron, and iron-holder is reduced to below 2%; Slag after the 5th deironing is sent in the slag tuber grinder grinding to specific surface area 450m
2More than/the kg.
Reclaim iron the 6th time:
Slag tuber grinder afterbody in Fig. 2 increases deironing system (increasing by 2 settling pockets and 1 cover centrifugal classifier successively), slag breeze is carried out iron powder reclaim; The density of iron is much larger than cement minerals, by the separable iron powder that goes out 10-20% of 1 natural sedimentation, through the separable iron powder that goes out 20-40% of 2 natural subsidence; The particle diameter of iron powder is generally at 0.1-2mm in the slag breeze, and the particle of breeze is generally less than 100 microns, therefore particle diameter can be separated greater than 100 microns powder by rotating speed and the wind speed of adjusting powder separating machine, by the separable iron powder that goes out 70-80% of this technology.
Make the iron-holder in the slag be reduced to 0.2-0.3% by above technology by 13%-15%.
Embodiment 2:
As Fig. 2, shown in Figure 4, from slag, reclaim the method for iron, comprise the steps:
Reclaim iron the 1st time:
Adopt magneticchuck that the cooled steel slag of coming out of the stove is carried out reclaiming the first time iron, the bulk slag is after the first time, magneticchuck was got iron, and the bulk metal iron that is not wrapping in the slag piece is removed, and iron-holder is reduced to 6%-8% by initial 13%-15%; The slag piece that reclaims the first time behind the iron enters the particle that jaw crusher carries out being broken into for the first time particle diameter 30-40mm.
Reclaim iron the 2nd time:
Steel slag particle after the fragmentation first time enters the 2nd time and reclaims iron, and the 2nd time recovery iron adopts electric magnetic iron remover to get iron, and iron-holder is reduced to 5%-6% by 6%-8%; The slag that reclaims for the 2nd time behind the iron adopts impact crusher to carry out the fragmentation second time, and the slag particle diameter is reduced to below the 10mm.
Reclaim iron the 3rd time:
Steel slag particle after the fragmentation second time carries out No. the 3rd electric magnetic iron remover and reclaims iron, and iron-holder is reduced to 3%-4% by 5%-6%; Slag after the 3rd deironing adopts column mill to carry out pre-for the third time grinding, and the slag particle diameter is reduced to below the 5mm.
The 4th reclaims iron:
Steel slag particle after fragmentation for the third time carries out the 4th electric magnetic iron remover and reclaims iron, and iron level can be reduced to 2%-3%; The slag that the 4th reclaims behind the iron adopts rod mill to carry out the 4th fragmentation, and the slag particle diameter is reduced to 1-2mm.
The 5th reclaims iron:
Steel slag particle after the 4th fragmentation carries out the 5th electric magnetic iron remover and reclaims iron; No. 5 electric magnetic iron removers of slag experience reclaim after the iron, and iron-holder is reduced to below 2%; Slag after the 5th deironing is sent in the slag tuber grinder grinding to specific surface area 450m
2More than/the kg.
Reclaim iron the 6th time:
Slag tuber grinder afterbody in Fig. 2 increases deironing system (increasing by 1 cover electromagnetism equipment for removing ferric ion and 1 cover centrifugal classifier successively), slag breeze is carried out iron powder reclaim; Utilize the Maxell theory of electromagnetic field, electricity is converted to magnetic, during through the electromagnetism magnetic separator de-ironing, rely on the effect deironing of magnet at slag breeze, by the electromagnetism deironing, the separable iron that goes out 60%-70%.Pass through centrifugal classifier then,, isolate particle greater than 100 microns coarse particles by adjusting the rotating speed and the wind speed of powder separating machine.By the separable iron powder that goes out 80-85% of this technology.
Make the iron-holder in the slag be reduced to 0.20-0.25% by above technology by 13%-15%.
Embodiment 3:
As Fig. 2, shown in Figure 5, from slag, reclaim the method for iron, comprise the steps:
Reclaim iron the 1st time:
Adopt magneticchuck that the cooled steel slag of coming out of the stove is carried out reclaiming the first time iron, the bulk slag is after the first time, magneticchuck was got iron, and the bulk metal iron that is not wrapping in the slag piece is removed, and iron-holder is reduced to 6%-8% by initial 13%-15%; The slag piece that reclaims the first time behind the iron enters the particle that jaw crusher carries out being broken into for the first time particle diameter 30-40mm.
Reclaim iron the 2nd time:
Steel slag particle after the fragmentation first time enters the 2nd time and reclaims iron, and the 2nd time recovery iron adopts electric magnetic iron remover to get iron, and iron-holder is reduced to 5%-6% by 6%-8%; The slag that reclaims for the 2nd time behind the iron adopts impact crusher to carry out the fragmentation second time, and the slag particle diameter is reduced to below the 10mm.
Reclaim iron the 3rd time:
Steel slag particle after the fragmentation second time carries out No. the 3rd electric magnetic iron remover and reclaims iron, and iron-holder is reduced to 3%-4% by 5%-6%; Slag after the 3rd deironing adopts column mill to carry out pre-for the third time grinding, and the slag particle diameter is reduced to below the 5mm.
The 4th reclaims iron:
Steel slag particle after fragmentation for the third time carries out the 4th electric magnetic iron remover and reclaims iron, and iron level can be reduced to 2%-3%; The slag that the 4th reclaims behind the iron adopts rod mill to carry out the 4th fragmentation, and the slag particle diameter is reduced to 1-2mm.
The 5th reclaims iron:
Steel slag particle after the 4th fragmentation carries out the 5th electric magnetic iron remover and reclaims iron; No. 5 electric magnetic iron removers of slag experience reclaim after the iron, and iron-holder is reduced to below 2%; Slag after the 5th deironing is sent in the slag tuber grinder grinding to specific surface area 450m
2More than/the kg.
Reclaim iron the 6th time:
Slag tuber grinder afterbody in Fig. 2 increases by 1 settling pocket and 1 cover electromagnetism equipment for removing ferric ion successively, slag breeze is carried out iron powder reclaim; The density of iron is much larger than cement minerals, by the separable iron powder that goes out 10-20% of 1 natural sedimentation.Utilize the Maxell theory of electromagnetic field, electricity is converted to magnetic.During through the electromagnetism magnetic separator de-ironing, rely on the effect deironing of magnet at slag breeze, by the electromagnetism deironing, by the separable iron powder that goes out 80-90% of this technology.
Make the iron-holder in the slag be reduced to 0.20-0.10% by above technology by 13%-15%.
Embodiment 4:
As Fig. 2, shown in Figure 6, from slag, reclaim the method for iron, comprise the steps:
Reclaim iron the 1st time:
Adopt magneticchuck that the cooled steel slag of coming out of the stove is carried out reclaiming the first time iron, the bulk slag is after the first time, magneticchuck was got iron, and the bulk metal iron that is not wrapping in the slag piece is removed, and iron-holder is reduced to 6%-8% by initial 13%-15%; The slag piece that reclaims the first time behind the iron enters the particle that jaw crusher carries out being broken into for the first time particle diameter 30-40mm.
Reclaim iron the 2nd time:
Steel slag particle after the fragmentation first time enters the 2nd time and reclaims iron, and the 2nd time recovery iron adopts electric magnetic iron remover to get iron, and iron-holder is reduced to 5%-6% by 6%-8%; The slag that reclaims for the 2nd time behind the iron adopts impact crusher to carry out the fragmentation second time, and the slag particle diameter is reduced to below the 10mm.
Reclaim iron the 3rd time:
Steel slag particle after the fragmentation second time carries out No. the 3rd electric magnetic iron remover and reclaims iron, and iron-holder is reduced to 3%-4% by 5%-6%; Slag after the 3rd deironing adopts column mill to carry out pre-for the third time grinding, and the slag particle diameter is reduced to below the 5mm.
The 4th reclaims iron:
Steel slag particle after fragmentation for the third time carries out the 4th electric magnetic iron remover and reclaims iron, and iron level can be reduced to 2%-3%; The slag that the 4th reclaims behind the iron adopts rod mill to carry out the 4th fragmentation, and the slag particle diameter is reduced to 1-2mm.
The 5th reclaims iron:
Steel slag particle after the 4th fragmentation carries out the 5th electric magnetic iron remover and reclaims iron; No. 5 electric magnetic iron removers of slag experience reclaim after the iron, and iron-holder is reduced to below 2%; Slag after the 5th deironing is sent in the slag tuber grinder grinding to specific surface area 450m
2More than/the kg.
Reclaim iron the 6th time:
Slag tuber grinder afterbody in Fig. 2 increases by 1 settling pocket, 1 cover electromagnetism equipment for removing ferric ion and 1 cover centrifugal classifier successively, slag breeze is carried out iron powder reclaim; The density of iron is much larger than cement minerals, by the separable iron powder that goes out 10-20% of 1 natural sedimentation.Utilize the Maxell theory of electromagnetic field, electricity is converted to magnetic.During through the electromagnetism magnetic separator de-ironing, rely on the effect deironing of magnet at slag breeze, by the electromagnetism deironing, by the separable iron powder that goes out 80-90% of this technology.Pass through powder separating machine then,, isolate particle greater than 100 microns coarse particles by adjusting the rotating speed and the wind speed of powder separating machine.By the separable iron powder that goes out 90--95% of this technology.
Make the iron-holder in the slag be reduced to 0.10-0.05% by above technology by 13%-15%.
Claims (1)
1. from slag, reclaim the method for iron, it is characterized in that comprising the steps:
Reclaim iron the 1st time: adopt magneticchuck that the cooled steel slag of coming out of the stove is carried out reclaiming the first time iron, the slag piece behind the recovery iron enters the particle that jaw crusher carries out being broken into for the first time particle diameter 30-40mm;
Reclaim iron the 2nd time: the steel slag particle after the fragmentation first time enters the 2nd time and reclaims iron, and the 2nd time recovery iron adopts the electric magnetic iron remover deironing; The slag that reclaims for the 2nd time behind the iron adopts impact crusher to carry out the fragmentation second time, and the slag particle diameter is reduced to below the 10mm;
Reclaim iron the 3rd time: the steel slag particle after the fragmentation second time carries out No. the 3rd electric magnetic iron remover and reclaims iron; The slag that reclaims for the 3rd time behind the iron adopts column mill to carry out fragmentation for the third time, and the slag particle diameter is reduced to below the 5mm;
The 4th reclaims iron: the steel slag particle after fragmentation for the third time carries out the 4th electric magnetic iron remover and reclaims iron; The slag that the 4th reclaims behind the iron adopts rod mill to carry out the 4th fragmentation, and the slag particle diameter is reduced to 1-2mm;
The 5th reclaims iron: the steel slag particle after the 4th fragmentation carries out the 5th electric magnetic iron remover and reclaims iron, and the 5th reclaims slag behind the iron and sends in the slag tuber grinder grinding to specific surface area 450m
2More than/the kg;
Reclaim iron the 6th time:
Any that slag breeze behind the grinding is adopted following four kinds of technologies carries out the 6th time and reclaims iron,
(1). increase 1-2 settling pocket and 1 cover centrifugal classifier or cyclone type powder sorting machine or O-SEPA high-efficient powder concentrator successively at slag tuber grinder afterbody, slag breeze is carried out iron powder reclaim;
(2). increase by 1 cover electromagnetism equipment for removing ferric ion and 1 cover centrifugal classifier or cyclone type powder sorting machine or O-SEPA high-efficient powder concentrator successively at slag tuber grinder afterbody, slag breeze is carried out iron powder reclaim;
(3). increase by 1 settling pocket and 1 cover electromagnetism equipment for removing ferric ion successively at slag tuber grinder afterbody, slag breeze is carried out iron powder reclaim;
(4). increase by 1 settling pocket, 1 cover electromagnetism equipment for removing ferric ion and 1 cover centrifugal classifier or cyclone type powder sorting machine or O-SEPA high-efficient powder concentrator successively at slag tuber grinder afterbody, slag breeze is carried out iron powder reclaim.
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| CNB2005100190238A CN100386446C (en) | 2005-06-30 | 2005-06-30 | Method of high efficiency recovering iron from slag |
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| CN100386446C true CN100386446C (en) | 2008-05-07 |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100436334C (en) * | 2007-01-23 | 2008-11-26 | 东北大学 | Preparation method of high purity magnetic material nano ferric oxide |
| CN101927208B (en) * | 2009-06-23 | 2013-03-13 | 鞍山钢铁集团公司 | Optimized process for processing steel slag by magnetic separation |
| CN101880736B (en) * | 2010-05-26 | 2012-06-27 | 上海海笠工贸有限公司 | Preparation technology of superfine steel slag micropowder and production process |
| CN101864501A (en) * | 2010-06-22 | 2010-10-20 | 新兴河北工程技术有限公司 | Method for recycling iron from steel slag |
| CN102688880B (en) * | 2012-06-18 | 2014-02-26 | 武汉市天沭科技发展有限公司 | Method for efficiently recovering and reselecting steel slag |
| CN104591572B (en) * | 2015-01-05 | 2017-01-25 | 葛洲坝武汉道路材料有限公司 | Production method of steel slag aggregate for asphalt concrete |
| CN108169053A (en) * | 2017-12-16 | 2018-06-15 | 芜湖新兴铸管有限责任公司 | A kind of slag all iron content detection method |
| CN112774841A (en) * | 2021-01-28 | 2021-05-11 | 天津水泥工业设计研究院有限公司 | Iron and grinding resourceful treatment system are retrieved to slag |
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| CN1282635A (en) * | 2000-09-08 | 2001-02-07 | 武汉冶金渣环保工程有限责任公司 | Comprehensive utilization of steel slags |
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