CN105734279A - Iron ore concentrate preparation method capable of lowering coercive force of magnetized and roasted ore of refractory iron ore - Google Patents
Iron ore concentrate preparation method capable of lowering coercive force of magnetized and roasted ore of refractory iron ore Download PDFInfo
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- CN105734279A CN105734279A CN201610180288.4A CN201610180288A CN105734279A CN 105734279 A CN105734279 A CN 105734279A CN 201610180288 A CN201610180288 A CN 201610180288A CN 105734279 A CN105734279 A CN 105734279A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/26—Cooling of roasted, sintered, or agglomerated ores
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C1/00—Magnetic separation
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Abstract
The invention belongs to the technical field of mineral processing, and particularly relates to an iron ore concentrate preparation method capable of lowering the coercive force of magnetized and roasted ore of refractory iron ore. The method is used for reductive magnetized and roasted products of the refractory iron ore, the reductive magnetized and roasted products are cooled to a certain temperature under the condition of the reducing atmosphere or the neutral oxygen-free atmosphere, the flow of air in a cooler is controlled, the coercive force is lowered on the premise of guaranteeing the magnetism of minerals, then ore grinding, magnetic separation and concentration are carried out, finally iron ore concentrate products high in iron grade and recovery rate can be obtained, the coercive force of the roasted ore is successfully lowered, the magnetic agglomeration problem in the magnetic separation process is solved, the separation index is increased, the product quality is stable, and the economical efficiency is high.
Description
Technical field
The invention belongs to technical field of mineral processing, reduce refractory iron ore magnetizing roast ore deposit coercivity particularly to one
The method preparing iron ore concentrate.
Background technology
Iron ore magnetizing roast-magnetic separation refers to locate iron ore at certain temperature and corresponding atmospheric condition
Reason, makes the weak magnetism mineral in Ore be changed into ferromagnetism iron mineral, and recycling low intensity magnetic separation realizes ferromagnetism iron mineral and arteries and veins
The separation of stone ore thing, and then obtain iron ore concentrate.Then magnetizing roast magnetic separation obtains iron ore concentrate, is a kind of from Refractory iron ore
The middle effective method of recovery iron mineral.
During iron ore magnetizing roast, under the shortest time and high temperature, bloodstone is transformed into magnetic iron ore, and roasts
Burning ore deposit cooling procedure is chilling, and the magnetic characteristic causing roasted ore is high-coercive force.Coercivity has with the magnetic coagulation of magnetic iron ore
Having direct relation, coercivity is the biggest, and the agglomeration of magnetite ore particles is the most obvious, and agglomerate is more difficult to break up.Magnetic coagulation can be to rear
Continuous magnetic separation, classification and essence mine dehydration operation have a negative impact, and cause iron concentrate grade to be difficult to improve.Therefore, magnetizing roast
The iron concentrate grade of iron mine is generally 60%, it is difficult to improve further.
During iron ore magnetizing roast at present, main water-cooling pattern carries out quenching to roasted ore.Roasting after water-cooled
Burn ore deposit in assorting room, for improving concentrate grade, can be selected for the low magnetic plant of field intensity, carry out the means such as de-magnetic treatment and enter
OK, but, iron concentrate grade is improved and inconspicuous by those modes, and causes iron recovery to reduce.
Summary of the invention
For the problems referred to above, the present invention present on coercivity control technology during existing refractory iron ore magnetizing roast
There is provided a kind of and reduce the method that refractory iron ore magnetizing roast ore deposit coercivity prepares iron ore concentrate, it is therefore an objective to obtained by the inventive method
To the coercivity roasted ore less than 10 kA/m, product is prone to improve concentrate grade.
The technical scheme realizing the object of the invention follows the steps below:
(1) the reduction magnetization roasted product of the refractory iron ore that temperature is 550～700 DEG C is placed in cooler, in reducing gases
It is cooled to 400～500 DEG C under the conditions of atmosphere or neutral oxygen-free atmosphere；
(2) the reduction magnetization roasted product being cooled to 400～500 DEG C in cooler is passed through flow 1～20 m3The sky of/t h
Gas or cooling gas, be cooled to 50-120 DEG C, release material from cooler；
(3) material being cooled to room temperature further, it is 5 ~ 10 kA/m that detection obtains the coercivity of reduction magnetization roasted product, than
Use the reduction magnetization low 30-90% of roasted product coercivity that water-cooled obtains；
(4) the magnetizing roast product that coercivity reduces in step (3) adds water and makes the ore pulp of weight concentration 20%～50%, carries out
Magnetic separation, jettisoning accounts for the mine tailing of product gross weight 15-40% after magnetic separation, use agitator mill the magnetic separation rough concentrate of acquisition is milled to-
The part of 400 mesh accounts for whole magnetic separation rough concentrate weight 70%～95%, then carries out magnetic separation with drum magnetic separator, controls magnetic field intensity
Be 0.1～0.4T, it is thus achieved that magnetic concentrate as rough concentrate；
(5) selected by carrying out to rough concentrate with electromagnetic refiner, the electric current controlling electromagnetic refiner is 0.5～2.5 A, rises
Water velocity 5～35 cm/s, it is thus achieved that selected concentrate filter remove moisture removal, it is thus achieved that the concentrate product of Iron grade 59%～65%, ferrum
The response rate more than 80%；
When needs improve concentrate product grade further, the cation-collecting agent adding 10-100g/t carries out flotation, it is thus achieved that ferrum
The concentrate product of grade 60%～68%, the response rate of ferrum is more than 80%.
Wherein, described reducing atmosphere is carbon monoxide atmosphere or hydrogen atmosphere or coal gas atmosphere.
Described nitrogen and oxygen mixed gas that cooling gas is carrier of oxygen volume concentrations 30%～40%.
Compared with prior art, the feature of the present invention and providing the benefit that:
The method of the present invention is for the reduction magnetization roasted product of refractory iron ore, under the conditions of reducing atmosphere or neutral oxygen-free atmosphere
It is cooled to uniform temperature, controls the flow of air in cooler, under conditions of ensureing magnetic mineral, reduce coercivity, then
Carry out ore grinding-magnetic separation-selected, obtain the iron extract mine producation that Iron grade is high, the response rate is big, successfully reduce the coercive of roasted ore
Power, solves magnetic coagulation problem during magnetic separation, improves separation index, constant product quality, have preferable economy.
Detailed description of the invention
Embodiment 1
The embodiment of the present invention reduces the method that refractory iron ore magnetizing roast ore deposit coercivity prepares iron ore concentrate, according to following steps
Carry out:
(1) Anshan taken from by the sample of the present embodiment, is a kind of containing hematite ore, by the ore reduction magnetization that temperature is 550 DEG C
Roasted product is placed in cooler, is cooled to 500 DEG C under the conditions of carbon monoxide atmosphere；
(2) the reduction magnetization roasted product being cooled to 500 DEG C in cooler is passed through flow 20 m3The air of/t h, is cooled to
100 DEG C, release material from cooler；
(3) material being cooled to room temperature further, it is 5 kA/m that detection obtains the coercivity of reduction magnetization roasted product, than employing
The reduction magnetization roasted product coercivity that water-cooled obtains is low by 50%, only 5 kA/m；
(4) the magnetizing roast product that coercivity reduces in step (3) adds water and makes the ore pulp of weight concentration 45%, carries out magnetic separation,
Jettisoning accounts for the mine tailing of product gross weight 40% after magnetic separation, uses agitator mill that the magnetic separation rough concentrate of acquisition is milled to the portion of-400 mesh
Dividing and account for whole magnetic separation rough concentrate weight 95%, then carry out magnetic separation with drum magnetic separator, control magnetic field intensity is 0.25T, it is thus achieved that
Magnetic concentrate is as rough concentrate；
(5) selected by carrying out to rough concentrate with electromagnetic refiner, the electric current controlling electromagnetic refiner is 2.5 A, ascending current
Speed 35 cm/s, it is thus achieved that selected concentrate filter remove moisture removal, it is thus achieved that the concentrate product of Iron grade 65%, the response rate of ferrum is more than
80%。
Embodiment 2
The embodiment of the present invention reduces the method that refractory iron ore magnetizing roast ore deposit coercivity prepares iron ore concentrate, according to following steps
Carry out:
(1) Anshan taken from by the sample of the present embodiment, is a kind of containing hematite ore, by the ore reduction magnetization that temperature is 650 DEG C
Roasted product is placed in cooler, is cooled to 400 DEG C under the conditions of hydrogen atmosphere；
(2) the reduction magnetization roasted product being cooled to 400 DEG C in cooler is passed through flow 10 m3The oxygen volume of/t h is dense
The nitrogen of degree 35% and oxygen mixed gas, be cooled to 120 DEG C, releases material from cooler；
(3) material being cooled to room temperature further, it is 8kA/m that detection obtains the coercivity of reduction magnetization roasted product, than employing
The reduction magnetization roasted product coercivity that water-cooled obtains is low by 30%, only 8 kA/m；
(4) the magnetizing roast product that coercivity reduces in step (3) adds water and makes the ore pulp of weight concentration 20%, carries out magnetic separation,
Jettisoning accounts for the mine tailing of product gross weight 20% after magnetic separation, uses agitator mill that the magnetic separation rough concentrate of acquisition is milled to the portion of-400 mesh
Dividing and account for whole magnetic separation rough concentrate weight 70%, then carry out magnetic separation with drum magnetic separator, control magnetic field intensity is 0.07T, it is thus achieved that
Magnetic concentrate is as rough concentrate；
(5) selected by carrying out to rough concentrate with electromagnetic refiner, the electric current controlling electromagnetic refiner is 1.5A, ascending water speed
Spend 5 cm/s, it is thus achieved that selected concentrate filter remove moisture removal, it is thus achieved that the concentrate product of Iron grade 59%, the response rate of ferrum is more than
80%；
During in order to improve concentrate product grade further, the cation-collecting agent adding 100g/t carries out flotation, it is thus achieved that Iron grade
The concentrate product of 68%, the response rate of ferrum is more than 80%.
Wherein, described reducing atmosphere is carbon monoxide atmosphere or hydrogen atmosphere or coal gas atmosphere.
Embodiment 3
The embodiment of the present invention reduces the method that refractory iron ore magnetizing roast ore deposit coercivity prepares iron ore concentrate, according to following steps
Carry out:
(1) Anshan taken from by the sample of the present embodiment, is a kind of containing hematite ore, by the ore reduction magnetization that temperature is 700 DEG C
Roasted product is placed in cooler, is cooled to 450 DEG C under the conditions of neutral oxygen-free atmosphere；
(2) the reduction magnetization roasted product being cooled to 450 DEG C in cooler is passed through flow 1m3The air of/t h, is cooled to 50
DEG C, release material from cooler；
(3) material being cooled to room temperature further, it is 10 kA/m that detection obtains the coercivity of reduction magnetization roasted product, and ratio is adopted
The reduction magnetization roasted product coercivity obtained by water-cooled is low by 90%, only 2 kA/m；
(4) the magnetizing roast product that coercivity reduces in step (3) adds water and makes the ore pulp of weight concentration 50%, carries out magnetic separation,
Jettisoning accounts for the mine tailing of product gross weight 15% after magnetic separation, uses agitator mill that the magnetic separation rough concentrate of acquisition is milled to the portion of-400 mesh
Dividing and account for whole magnetic separation rough concentrate weight 80%, then carry out magnetic separation with drum magnetic separator, control magnetic field intensity is 0.15T, it is thus achieved that
Magnetic concentrate is as rough concentrate；
(5) selected by carrying out to rough concentrate with electromagnetic refiner, the electric current controlling electromagnetic refiner is 0.5 A, ascending current
Speed 20 cm/s, it is thus achieved that selected concentrate filter remove moisture removal, it is thus achieved that the concentrate product of Iron grade 64%, the response rate of ferrum is more than
80%。
Claims (3)
1. one kind reduces the method that refractory iron ore magnetizing roast ore deposit coercivity prepares iron ore concentrate, it is characterised in that according to lower step
Carry out:
(1) the reduction magnetization roasted product of the refractory iron ore that temperature is 550～700 DEG C is placed in cooler, in reducing gases
It is cooled to 400～500 DEG C under the conditions of atmosphere or neutral oxygen-free atmosphere；
(2) the reduction magnetization roasted product being cooled to 400～500 DEG C in cooler is passed through flow 1～20 m3The air of/t h
Or cooling gas, it is cooled to 50-120 DEG C, releases material from cooler；
(3) material being cooled to room temperature further, it is 5 ~ 10 kA/m that detection obtains the coercivity of reduction magnetization roasted product, than
Use the reduction magnetization low 30-90% of roasted product coercivity that water-cooled obtains；
(4) the magnetizing roast product that coercivity reduces in step (3) adds water and makes the ore pulp of weight concentration 20%～50%, carries out
Magnetic separation, jettisoning accounts for the mine tailing of product gross weight 15-40% after magnetic separation, use agitator mill the magnetic separation rough concentrate of acquisition is milled to-
The part of 400 mesh accounts for whole magnetic separation rough concentrate weight 70%～95%, then carries out magnetic separation with drum magnetic separator, controls magnetic field intensity
Be 0.1～0.4T, it is thus achieved that magnetic concentrate as rough concentrate；
(5) selected by carrying out to rough concentrate with electromagnetic refiner, the electric current controlling electromagnetic refiner is 0.5～2.5 A, rises
Water velocity 5～35 cm/s, it is thus achieved that selected concentrate filter remove moisture removal, it is thus achieved that the concentrate product of Iron grade 59%～65%, ferrum
The response rate more than 80%；
When needs improve concentrate product grade further, the cation-collecting agent adding 10-100g/t carries out flotation, it is thus achieved that ferrum
The concentrate product of grade 60%～68%, the response rate of ferrum is more than 80%.
The most according to claim 1 a kind of reduce the method that refractory iron ore magnetizing roast ore deposit coercivity prepares iron ore concentrate,
It is characterized in that described reducing atmosphere is carbon monoxide atmosphere or hydrogen atmosphere or coal gas atmosphere.
The most according to claim 1 a kind of reduce the method that refractory iron ore magnetizing roast ore deposit coercivity prepares iron ore concentrate,
It is characterized in that described nitrogen and oxygen mixed gas that cooling gas is carrier of oxygen volume concentrations 30%～40%.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610180288.4A CN105734279A (en) | 2016-03-28 | 2016-03-28 | Iron ore concentrate preparation method capable of lowering coercive force of magnetized and roasted ore of refractory iron ore |
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| CN201610180288.4A CN105734279A (en) | 2016-03-28 | 2016-03-28 | Iron ore concentrate preparation method capable of lowering coercive force of magnetized and roasted ore of refractory iron ore |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107149978A (en) * | 2017-07-04 | 2017-09-12 | 鞍钢集团矿业有限公司 | A kind of ore-dressing technique that tumbling ball mill is substituted with agitating mill |
| CN112390453A (en) * | 2020-11-25 | 2021-02-23 | 上海交通大学 | Modified magnetic Fe3O4Powder, method for the production thereof and use thereof |
| WO2022088396A1 (en) * | 2020-10-26 | 2022-05-05 | 中钢设备有限公司 | Method for extracting iron from high-phosphorus oolitic iron ore by suspension roasting and removing phosphorus by acid leaching |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102974456A (en) * | 2012-12-11 | 2013-03-20 | 中国地质科学院矿产综合利用研究所 | Separation process of refractory iron ore |
| CN104745800A (en) * | 2015-03-30 | 2015-07-01 | 东北大学 | Three-stage suspension roasting-magnetic separation method for hematite-limonite mixed iron ores |
| CN104818378A (en) * | 2015-03-30 | 2015-08-05 | 东北大学 | Preenrichment-three segment suspension roasting-magnetic separation treatment method of complex refractory iron ores |
-
2016
- 2016-03-28 CN CN201610180288.4A patent/CN105734279A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102974456A (en) * | 2012-12-11 | 2013-03-20 | 中国地质科学院矿产综合利用研究所 | Separation process of refractory iron ore |
| CN104745800A (en) * | 2015-03-30 | 2015-07-01 | 东北大学 | Three-stage suspension roasting-magnetic separation method for hematite-limonite mixed iron ores |
| CN104818378A (en) * | 2015-03-30 | 2015-08-05 | 东北大学 | Preenrichment-three segment suspension roasting-magnetic separation treatment method of complex refractory iron ores |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107149978A (en) * | 2017-07-04 | 2017-09-12 | 鞍钢集团矿业有限公司 | A kind of ore-dressing technique that tumbling ball mill is substituted with agitating mill |
| CN107149978B (en) * | 2017-07-04 | 2019-11-05 | 鞍钢集团矿业有限公司 | A kind of ore-dressing technique with agitating mill substitution tumbling ball mill |
| WO2022088396A1 (en) * | 2020-10-26 | 2022-05-05 | 中钢设备有限公司 | Method for extracting iron from high-phosphorus oolitic iron ore by suspension roasting and removing phosphorus by acid leaching |
| CN112390453A (en) * | 2020-11-25 | 2021-02-23 | 上海交通大学 | Modified magnetic Fe3O4Powder, method for the production thereof and use thereof |
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Application publication date: 20160706 |
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