CN101007294A - Magnetic separation concentration method - Google Patents
Magnetic separation concentration method Download PDFInfo
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- CN101007294A CN101007294A CN 200710026511 CN200710026511A CN101007294A CN 101007294 A CN101007294 A CN 101007294A CN 200710026511 CN200710026511 CN 200710026511 CN 200710026511 A CN200710026511 A CN 200710026511A CN 101007294 A CN101007294 A CN 101007294A
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- magnetic separation
- slag
- tfe
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Abstract
The invention involves a method of select enriched magnetic powder which includes pre-drying, grinding and magnetic separation. A, sending wet magnetic powder which particle size is 0-30mm and TFe<=40% into drying equipment to pre-drying, temperature should be controlled below 950 degree C, the initial water content should decrease from <=20% to <=5% through pre-drying;B, cooling the pre-dried magnetic powder in step A until the temperature below 100 degree C, sending it into a mill equipments to grinding until the size <= 6mm, while using waste heat of magnetic powder and the friction heat when grinding further drying water content <=2%; C, using magnet separator to magnetic select and enrich the magnetic powder treated in step B, then preparing Fe fine powder which TFe>=55%, clean granule steel which TFe>=90% and non-magnetic tailings powder. The invention can separate slag and steel completely and increase magnetic slag TFe significantly; The production process do not discharge wastewater and waste slag, and no dust emissions, it achieves completely effective use of steel slag resources and clean production of steel slag processing and treatment.
Description
[technical field]
The present invention relates to a kind of method of metallurgical steel slag comprehensive utilization of resources, especially relate to a kind of method of slag being carried out the magnetic separation concentration of comprehensive utilization of resources.
[background technology]
Explanation of nouns: TFe is meant the grade of iron, i.e. the weight percent content of iron.
Magnetic separation is meant the magnetic slag of metallurgical steel slag gained TFe≤40%, granularity≤30mm after operations such as stewingization, fragmentation, magnetic separation classification.
Continuous expansion along with China's iron and steel output, slag output also is on the increase, and the development and use steel slag resource is the important measures that realize the metallurgical steel slag comprehensive utilization of resources, also meet the industrial policy of aspects such as the National Environmental comprehensive regulation, comprehensive utilization of resources, remarkable economical and social benefit are arranged.Simultaneously the sustainable development that guarantees steel industry had crucial meaning.
In recent years, China's slag is handled and is utilized technology to obtain breakthrough progress, by technical research, employ new technology, new technology, new equipment is realized the further processing processing of slag, improve the tenor of slag steel, utilize the sensible heat of high temperature slag, water spray makes the slag internal-external temperature difference excessive and produce thermal stress in stewing jar, ore deposit phase change and produce transformation stress etc., slag is cooled off fast, naturally broken, thereby realized that metal and the better of slag separate, after multistage classification magnetic separation, non magnetic tailings deep processing becomes cement raw material or concrete admixture, and magnetic slag is first class slag steel (TFe 〉=85%, grade is+50mm), second class slag steel (TFe 〉=65%, grade be 30～50mm) and magnetic separation (TFe≤40%, grade is 0～30mm), still has broken little steel grit in the magnetic separation.
As everyone knows, the mineral composition of non magnetic slag mainly contains calcium silicates (CaOSiO
2), dicalcium silicate (2CaOSiO
2), tricalcium silicate (3CaOSiO
2), ferrosilite (2FeSiO
2), manganous silicate (MnOSiO
2), calcium ferrite (CaOFe
2O
3), dicalcium ferrite (2CaOFe
2O
3), lime-olivine (CaOFeOSiO
2), tricalcium phosphate (3CaOP
2O
5), calcirm-fluoride eutectic (CaOCrF
2) etc., slag is through the water spray slag stewing, the magnetic separation of TFe≤40% of multi-stage screening, magnetic separation gained, and water content is generally all below 20%, and steel grit wherein is coated with thicker ground-slag, because the surface tension of water makes magnetic slag and non magnetic slag inter-adhesive; Non magnetic tailings is before producing novel energy-saving environment-friendly type construction material, at first to eliminate metallic iron wherein, then to dry to moisture content and be lower than 2%, during wet grinding not only metallic iron can not remove fully, the slag chemism reduces significantly, and its initial moisture content is more than 30%, makes the oven dry energy consumption too high, and the difficulty of recycling increases.
In order further to improve the grade of magnetic separation, domestic each steel plant mostly adopt wet ball grinding washing, wet magnetic separation process of enriching, to grade is that the magnetic separation of 0-30mm carries out deep processing, but the shortcoming of this technology: the one, because ore pulp viscosity does not reach 55% than the smart powder TFe of ambassador's product iron in the magnetic concentration process, the Iron Ore Matching in Sintering difficulty is increased, and consumption is also few; The 2nd, the broken little steel grit that is wrapped in the slag can not get reclaiming fully, has caused the waste of resource; The 3rd, the metal Ferrum content in the non magnetic tailings surpasses 1%, and its moisture content is higher than 30%, tailings with water generation chemical reaction after, tailings loses chemism, makes it become the difficulty of concrete admixture to increase with deep processing as cement mixture, performance reduces; The 4th, washwater effluxes the waste that causes environmental pollution and water resource, mineral resources.
[summary of the invention]
In order to overcome the above-mentioned shortcoming of prior art, the invention provides a kind of method that adopts dry type grinding, dry type magnetic separation enrichment to produce the magnetic separation concentration of the smart powder of high grade iron, clean steel grit, the present invention can reach that energy consumption is low, good product quality, can realize that resource is all effectively utilized, non magnetic tailings do not need to dry the production that promptly can be used for New Building Materials, and the purpose of technical characteristic such as pollution-free.
The technical solution adopted for the present invention to solve the technical problems is: a kind of method of magnetic separation concentration, comprise prebake, grinding and magnetic separation, and its processing step is:
A, be that the wet magnetic separation of 0-30mm is sent into and carried out prebake in the drying plant with granularity, temperature is controlled at below 950 ℃ dry, and by first moisture content≤20%, prebake is to moisture content≤5% with it;
B, will be through the magnetic separation after the prebake of processing of step A, be cooled to temperature and be below 100 ℃ after, send into and carry out grinding in the milling equipment, make its granularity≤6mm, the frictional heat that produces when utilizing the waste heat of magnetic separation and grinding is simultaneously further dried to moisture content≤2%;
C, will carry out magnetic concentration with magnetic separator, thereby obtain the smart powder of iron, the clean steel grit of TFe 〉=90% and the non magnetic ground slag of TFe 〉=55% through the magnetic separation after step B handles.
That drying plant in the described steps A comprises is vertical, swinging, oscillatory type, tunnel type or cell-type dryer.
Milling equipment among the described step B comprises ball mill, rod mill, straight-through mill or column mill.
Magnetic separator among the described step C comprises permanent type, electromagnetic type, ferromagnetism or weak magnetic, single double drum type magnetic separator.
Described pretreated flue gas after the air box impulse bag-type dust-precipitator purifies, with dust content less than 50mg/m
3Primary standard discharging.
Described milling equipment tail gas also after the air box impulse bag-type dust-precipitator purifies, with dust content less than 50mg/m
3Primary standard discharging.
The invention has the beneficial effects as follows: wet magnetic separation is carried out prebake and grinding, make its moisture content be reduced to moisture content≤2% by≤20%, slag, steel can be separated fully, magnetic slag and non magnetic slag can be not inter-adhesive because of the existence of moisture content yet, thereby can improve the separation accuracy of the two, magnetic slag TFe is increased substantially, and become the smart powder of iron of TFe 〉=55%; The grain steel shows that the ground-slag that adheres to also is worn and becomes the clean steel of TFe 〉=90%; Non magnetic ground slag granularity is tiny, metal Ferrum content≤1%, moisture content≤2%, kept its intrinsic chemism, do not need oven dry in the use yet, and become the high-quality raw material of slag micro powder or slag and novel energy-saving environment-friendly type construction materials such as granulated blast-furnace slag complex slag or slag composite Portland cement; Do not have waste water, waste sludge discharge in the production process, do not have dust from flying yet, when realizing that steel slag resource 100% is effectively utilized, realized the cleaner production that slag processing is handled yet.
The present invention at first will wet magnetic separation prebake to moisture content≤5%, utilize magnetic separation waste heat and frictional heat that its moisture content is further dried to≤2% then, the reduction of non magnetic dreg chemistry activity when not only having avoided wet grinding, also make simultaneously tailings when producing novel energy-saving environment-friendly type construction material, save baking operation, become the high-quality raw material of novel energy-saving environment-friendly type construction material.
[description of drawings]
Fig. 1 is a process chart of the present invention.
[specific embodiment]
The present invention is further described below in conjunction with drawings and Examples.
Referring to Fig. 1, a kind of process of magnetic separation concentration, be 0-30mm at first with granularity, the wet magnetic separation of moisture content≤20%, be transported to material storage yard by automobile, send into transition feed bin before the dryer by forklift again, through oscillating feeder, belt conveyor, elevator is sent in the dryer, raw material in dryer through preheating, temperature is controlled at below 950 ℃ dry, its moisture content is reduced to below 5%, grain steel expanded by heating acts on surperficial ground-slag with thermal stress in drying course, its adhesive force is weakened, and inter-adhesive magnetic slag and non magnetic solid impurity particle have obtained initial gross separation; Through pretreated magnetic separation temperature below 100 ℃ the time, in belt conveyor feeding milling equipment, in grinding, continue oven dry, granularity is milled down to 0-6mm by 0-30mm, the a large amount of frictional heats that produce when utilizing the waste heat of oven dry back ground-slag and grinding and with moisture content further oven dry to below 2%, the ground-slag layer that is attached to a steel surface during grinding is separated with the grain steel fully by worn-off, and magnetic slag and non magnetic solid impurity particle adhesion body are further disperseed to become monomer; Utilize magnetic separator to carry out magnetic concentration and the smart powder of iron and the clean steel of TFe 〉=90% of TFe 〉=55%, the dryer flue gas then after the air box impulse bag-type dust-precipitator purifies, with dust content less than 50mg/m
3Primary standard discharging.Send in the magnetic plant by belt conveyor, milling equipment tail gas also after the air box impulse bag-type dust-precipitator purifies, with dust content less than 50mg/m
3Primary standard discharging.
The moisture content that goes out the magnetic separation behind the milling equipment is lower than 2%, temperature is about 80 ℃, by carrying out magnetic separation in the belt conveyor feeding magnetic separation unit, promptly get the smart powder of iron, TFe 〉=90% cleaning steel and metallic iron≤1%, moisture content≤2% of Fe 〉=55%, the non magnetic tailings of granularity≤6mm.
The present invention has that energy consumption is low, good product quality, can realize resource all effectively utilize, non magnetic tailings do not need to dry the production that promptly can be used for New Building Materials, and technical characteristic such as pollution-free.
Claims (6)
1, a kind of method of magnetic separation concentration is characterized in that: comprise prebake, grinding and magnetic separation, its processing step is:
A, be that the wet magnetic separation of 0-30mm, TFe≤40% is sent into and carried out prebake in the drying plant with granularity, temperature is controlled at below 950 ℃ dry, and by first moisture content≤20%, prebake is to moisture content≤5% with it;
B, will be through the magnetic separation after the prebake of processing of step A, be cooled to temperature and be below 100 ℃ after, send into and carry out grinding in the milling equipment, make its granularity≤6mm, the frictional heat that produces when utilizing the waste heat of magnetic separation and grinding is simultaneously further dried to moisture content≤2%;
C, will carry out magnetic concentration with magnetic separator, thereby obtain the smart powder of iron, the clean steel of TFe 〉=90% and the non magnetic ground slag of TFe 〉=55% through the magnetic separation after step B handles.
2, the method for magnetic separation concentration as claimed in claim 1 is characterized in that: the drying plant in the described steps A comprises vertical, swinging, oscillatory type, tunnel type or cell-type dryer.
3, the method for magnetic separation concentration as claimed in claim 1 is characterized in that: the milling equipment among the described step B comprises ball mill, rod mill, straight-through mill or column mill.
4, the method for magnetic separation concentration as claimed in claim 1 is characterized in that: the magnetic separator among the described step C comprises permanent type, electromagnetic type, ferromagnetism or weak magnetic, single, double cylinder magnetic separator.
5, the method for magnetic separation concentration as claimed in claim 1 is characterized in that: described pretreated flue gas after the air box impulse bag-type dust-precipitator purifies, with dust content less than 50mg/m
3Primary standard discharging.
6, the method for magnetic separation concentration as claimed in claim 1 is characterized in that: described milling equipment tail gas also after the air box impulse bag-type dust-precipitator purifies, with dust content less than 50mg/m
3Primary standard discharging.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100265110A CN100525922C (en) | 2007-01-26 | 2007-01-26 | Magnetic separation concentration method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100265110A CN100525922C (en) | 2007-01-26 | 2007-01-26 | Magnetic separation concentration method |
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| Publication Number | Publication Date |
|---|---|
| CN101007294A true CN101007294A (en) | 2007-08-01 |
| CN100525922C CN100525922C (en) | 2009-08-12 |
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ID=38696085
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|---|---|---|---|
| CNB2007100265110A Active CN100525922C (en) | 2007-01-26 | 2007-01-26 | Magnetic separation concentration method |
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|---|---|
| CN (1) | CN100525922C (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102168155A (en) * | 2011-03-17 | 2011-08-31 | 济南鲍安环保技术开发有限公司 | Production process of steel slag micro-powder |
| CN103143438A (en) * | 2013-03-05 | 2013-06-12 | 许建民 | Production technique of magnetite refined powdered iron by dry process |
| CN104399584A (en) * | 2014-12-13 | 2015-03-11 | 唐山市丰润区华晨机械维修部 | Dry magnetic separation technology for waste steel slags |
| CN105583148A (en) * | 2015-12-30 | 2016-05-18 | 平顶山华兴浮选工程技术服务有限公司 | Dry ore washing and dressing method |
| CN106192852A (en) * | 2016-07-28 | 2016-12-07 | 山东钢铁股份有限公司 | A kind of method on plant area of high-efficiency cleaning steel plant road surface |
| CN106179706B (en) * | 2016-08-04 | 2019-08-23 | 山东济钢合金材料科技有限公司 | A method of separating the iron oxide mixed from iron powder |
| CN110947515A (en) * | 2019-12-17 | 2020-04-03 | 攀枝花钢城集团有限公司 | Method for preparing fine-fraction steel slag used as admixture of cement and concrete |
| CN111836909A (en) * | 2018-03-01 | 2020-10-27 | 杰富意钢铁株式会社 | Method for producing manganese raw material and method for smelting manganese-containing steel |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4666591A (en) * | 1984-01-10 | 1987-05-19 | Kawasaki Jukogyo Kabushiki Kaisha | Slag disposal method |
| JPS62294140A (en) * | 1986-06-11 | 1987-12-21 | Nippon Jiryoku Senko Kk | Treatment of slag produced in iron making plant |
-
2007
- 2007-01-26 CN CNB2007100265110A patent/CN100525922C/en active Active
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102168155A (en) * | 2011-03-17 | 2011-08-31 | 济南鲍安环保技术开发有限公司 | Production process of steel slag micro-powder |
| CN102168155B (en) * | 2011-03-17 | 2012-09-05 | 天津苏美尔环保投资有限公司 | Production process of steel slag micro-powder |
| CN103143438A (en) * | 2013-03-05 | 2013-06-12 | 许建民 | Production technique of magnetite refined powdered iron by dry process |
| CN104399584A (en) * | 2014-12-13 | 2015-03-11 | 唐山市丰润区华晨机械维修部 | Dry magnetic separation technology for waste steel slags |
| CN105583148A (en) * | 2015-12-30 | 2016-05-18 | 平顶山华兴浮选工程技术服务有限公司 | Dry ore washing and dressing method |
| CN106192852A (en) * | 2016-07-28 | 2016-12-07 | 山东钢铁股份有限公司 | A kind of method on plant area of high-efficiency cleaning steel plant road surface |
| CN106192852B (en) * | 2016-07-28 | 2018-05-22 | 山东钢铁股份有限公司 | A kind of method on plant area of high-efficiency cleaning steel plant road surface |
| CN106179706B (en) * | 2016-08-04 | 2019-08-23 | 山东济钢合金材料科技有限公司 | A method of separating the iron oxide mixed from iron powder |
| CN111836909A (en) * | 2018-03-01 | 2020-10-27 | 杰富意钢铁株式会社 | Method for producing manganese raw material and method for smelting manganese-containing steel |
| CN111836909B (en) * | 2018-03-01 | 2023-01-13 | 杰富意钢铁株式会社 | Method for producing manganese raw material and method for smelting manganese-containing steel |
| CN110947515A (en) * | 2019-12-17 | 2020-04-03 | 攀枝花钢城集团有限公司 | Method for preparing fine-fraction steel slag used as admixture of cement and concrete |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100525922C (en) | 2009-08-12 |
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| C06 | Publication | ||
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Application publication date: 20070801 Assignee: SHAOGUAN QUJIANG SHENGDA METALLURGICAL SLAG ENVIRONMENTAL PROTECTION TECHNOLOGY DEVELOPMENT CO., LTD. Assignor: Guo Xinling Contract record no.: 2013440000411 Denomination of invention: Magnetic separation concentration method Granted publication date: 20090812 License type: Exclusive License Record date: 20130815 |
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