CN102876882A - Method for recovering iron from rare-earth tailings and producing high-grade fine iron powder - Google Patents

Method for recovering iron from rare-earth tailings and producing high-grade fine iron powder Download PDF

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Publication number
CN102876882A
CN102876882A CN2012103858833A CN201210385883A CN102876882A CN 102876882 A CN102876882 A CN 102876882A CN 2012103858833 A CN2012103858833 A CN 2012103858833A CN 201210385883 A CN201210385883 A CN 201210385883A CN 102876882 A CN102876882 A CN 102876882A
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China
Prior art keywords
iron
rare
intensity magnetic
earth
magnetic separation
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CN2012103858833A
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林海
许晓芳
董颖博
张文通
周闪闪
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Beijing University of Technology
University of Science and Technology Beijing USTB
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University of Science and Technology Beijing USTB
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Priority to CN2012103858833A priority Critical patent/CN102876882A/en
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Abstract

The invention discloses a method for recovering iron from rare-earth tailings and producing high-grade fine iron powder. Iron minerals are efficiently recovered from rare-earth tailings and high-grade fine iron powder is produced by a strongly magnetic pre-enrichment-iron rough concentrate reduction roasting-low-intensity magnetic separation method. The method is characterized by comprising the following steps of: performing rod milling of the rare-earth tailings, pre-enriching by a high-gradient high-intensity magnetic separator, recovering valuable ingredients such as rare earth and niobium from obtained tailings of high-intensity magnetic separation by methods such as a flotation method, and uniformly mixing an obtained iron rough concentrate and a carbon-containing reducing agent in a certain proportion for reduction roasting; and performing rod milling of a roasted product, and thus obtaining an iron rough concentrate with the grade of more than 90 percent and the recovery rate of more than 90 percent by a low-intensity magnetic separation method. According to the method, the iron minerals in the rare-earth tailings are pre-enriched by the high-gradient high-intensity magnetic separator, so that the tailings of high-intensity magnetic separation are further recycled; and the coupling relation between a deep reduction-low-intensity magnetic separation iron recovery process method and the recovery of other valuable components is determined.

Description

A kind of method that from rare-earth tailing, reclaims iron and produce the high grade iron fine powder
Technical field
The present invention relates to a kind of method based on coupled relation high efficiente callback iron from rare-earth tailing, belong to comprehensive utilization of resources and mineral manufacture field.
Background technology
Mineral resources are valuable sources that the mankind depend on for existence, have non-renewable and irreplaceability, are the bases of China's industrial development.Along with the fast development of China's economy, the contradiction of shortage of resources, environmental stress is increasing, and Developing Circulation Economy, raising resource utilization are the inevitable approach that solves current china natural resources, environmental constraints Economic development.Mine tailing should develop resource of tailings by all kinds of means as the solid waste of quantity maximum in the three industrial wastes, and valuable metal in the mine tailing is reclaimed, and is Mine Sustainable Development and fundamentally administers the important channel of mine environment.
The rare-earth tailing solid waste that to be rare-earth mineral produce after weak magnetic-strong magnetic-flotation flowsheet, a large amount of tailings impoundments in tailing dam, not only land occupation, cause environmental pollution, and cause the waste of the resources such as rare earth, iron, niobium.Utilize poor oxidized ore production rare earth ore concentrate in the Bayan Obo such as the Baogang dressing-works, iron in the rare-earth tailing that flotation produces, rare earth, content of niobium are higher, reach respectively 12.8%, 7%~9%, 1.0%, high comprehensive utilization value is arranged, reclaim these valuable constituents, can save production cost, improve the comprehensive utilization of resources rate, can reduce tailing dam and build dam and maintenance cost, save the expenses such as broken mill, exploitation.
Present more domestic scholars and R﹠D institution, recovery to rare-earth tailing iron, rare earth, niobium is studied, obtained certain achievement, but because rare-earth tailing forms more complicated, the valuable mineral grade is lower, the valuable element rate of recovery is not high, and traditional ore-dressing technique is difficult to its effective recycling.
Summary of the invention
Technical problem to be solved by this invention is: the method for high efficiente callback iron mineral from rare-earth tailing that provides on the basis of determining the coupled relation between processing method that iron is reclaimed in drastic reduction-low intensity magnetic separation and other valuable components of recovery that a kind of iron, rare earth are recycled simultaneously, production cost is lower.
Technical solution: a kind of method that reclaims iron and produce the high grade iron fine powder from rare-earth tailing specifically may further comprise the steps:
Step 1. high magnetic pre-selection enrichment: be the 200-325 order with rare-earth tailing wet type rod milling to granularity, then in High gradient high intensity magnetic separator in magneticstrength: under the 7000-13000 oersted, carry out magnetic separation, high intensity magnetic mineral after the magnetic separation is carried out reducing roasting, for subsequent use, the further recovering rare earth in the strong magnetic tail of gained ore deposit and other valuable constituent;
Step 2. batch mixing: adding the per-cent that accounts for the rare-earth tailing total mass in the high intensity magnetic mineral that step 1 prepares is that the carbon containing reducer of 10-40% and the per-cent that accounts for the rare-earth tailing total mass are the fusing assistant of 3-5%, mix, then adding according to high intensity magnetic mineral total mass per-cent in the mix surface that mixes is that the carbon containing reducer of 10-15% is to guarantee reducing atmosphere, obtain compound, for subsequent use;
Step 3. reducing roasting: the compound that step 2 is obtained send retort furnace, and maturing temperature is 1000-1300 ℃, and roasting time is 30-120min, carries out reducing roasting, obtains roasted ore;
Step 4. low intensity magnetic separation: roasted ore naturally cooling, wet type rod milling that step 3 is obtained, the rod milling time is 5-20min, to obtain fine granule material and tap water is made into ore pulp and sends into magnetic separator and carry out low intensity magnetic separation, the magnetic separation field intensity: the 1200-1600 oersted, obtain grade greater than 90%, the rate of recovery is greater than 90% iron ore concentrate.
Described carbon containing reducer is coke, hard coal, bituminous coal, brown coal.
Described fusing assistant is lime.
The present invention adopts method high efficiente callback iron mineral from rare-earth tailing of " strong magnetic preconcentration-iron rough concentrate reducing roasting-low intensity magnetic separation ", may further comprise the steps: carry out preconcentration through High gradient high intensity magnetic separator first after the rare-earth tailing rod milling, the valuable constituents such as method recovering rare earth, niobium such as flotation are adopted in the strong magnetic tail of gained ore deposit, and gained iron rough concentrate and carbon containing reducer, solubility promoter mix by a certain percentage and carry out reducing roasting; Product of roasting adopts the method for low intensity magnetic separation to obtain high grade iron concentrate after rod milling.
Beneficial effect of the present invention is:
1, the iron mineral in the employing High gradient high intensity magnetic separator preconcentration rare-earth tailing, the gained high intensity magnetic mineral carries out reducing roasting, other valuable constituents such as method recovering rare earth of flotation are adopted in the magnetic tail ore deposit more by force, has determined the processing method of drastic reduction-low intensity magnetic separation recovery iron and the coupled relation between other valuable components of recovery.
2, adopting the direct-reduction roasting, is iron with the iron rough concentrate direct-reduction of high magnetic pre-selection, and gained directly also
But former iron ore concentrate power supply stove steel-making.
3, add a small amount of fusing assistant during roasting, can improve grade and the rate of recovery of direct-reduced iron; Fusing assistant adopts lime, and is cheap, wide material sources.
Description of drawings
Fig. 1 is process flow sheet of the present invention.
Embodiment
Below in conjunction with specific embodiment technical scheme of the present invention is described further.
Example 1: the mine tailing of the rare-earth tailing in this example after from dressing-works, Inner Mongol floatation recovery rare earth, wherein all iron content is 19.73%, iron mineral is mainly rhombohedral iron ore, gangue mineral is take rare earth, niobium, quartz, fluorite, ferrodolomite, trichroite and phlogopite as main, and ore grain size can reach-200 orders 66.95%.
According to the character of mineral, reclaim iron and produce the technique of high grade iron fine powder as follows: rare-earth tailing is finely ground to-325 orders 80% laggard intensity magnetic separator (magneticstrength 11000Oe), obtains the iron rough concentrate of grade 25.75%, the rate of recovery 86.22%; Gained iron rough concentrate mixes with carbon containing reducer, the carbon containing reducer consumption is 10%, 5% fusing assistant, the mix surface that mixes add according to high intensity magnetic mineral total mass per-cent be 10% carbon containing reducer to guarantee reducing atmosphere, compound directly advances reducing roasting: maturing temperature is 1100 0C, roasting time 60min; Send the rod mill ore grinding behind the roasted ore naturally cooling, rod milling 5 minutes, grinding particle size accounts for 80% for-200 orders; Obtain fine granule material and tap water be made into ore pulp send into magnetic separator carry out low intensity magnetic separation (magneticstrength 1480Oe) must high grade iron concentrate and mine tailing, iron concentrate grade is up to 91%, the rate of recovery is 90.83%.
Example 2:Rare-earth tailing in this example is from the mine tailing of south behind certain dressing-works floatation recovery rare earth, wherein all iron content is 21.34%, iron mineral is mainly rhombohedral iron ore, limonite, gangue mineral is take rare earth, quartz, fluorite, barite, phlogopite, calcite and riebeckite as main, and ore grain size can reach-200 orders 69.78%.
According to the character of mineral, reclaim iron and produce the technique of high grade iron fine powder as follows: rare-earth tailing is finely ground to-325 orders 75% laggard intensity magnetic separator (magneticstrength 12000Oe), obtains the iron rough concentrate of grade 28.35%, the rate of recovery 85.48%; Gained iron rough concentrate mixes with carbon containing reducer, the carbon containing reducer consumption is 20%, 3% fusing assistant, the mix surface that mixes add according to high intensity magnetic mineral total mass per-cent be 15% carbon containing reducer to guarantee reducing atmosphere, compound directly advances reducing roasting: maturing temperature is 1100 ℃, roasting time 30min; Send the rod mill ore grinding behind the roasted ore naturally cooling, rod milling 15 minutes, grinding particle size accounts for 85% for-200 orders; Obtain fine granule material and tap water be made into ore pulp send into magnetic separator carry out low intensity magnetic separation (magneticstrength 1250Oe) must high grade iron concentrate and mine tailing, iron concentrate grade is up to 93.78%, the rate of recovery is 91.53%.
Embodiment 3:
Certain rare-earth tailing is finely ground to-325 orders 75% laggard intensity magnetic separator (magneticstrength 7000Oe), obtains the iron rough concentrate of grade 25.35%, the rate of recovery 88.40%; Gained iron rough concentrate mixes with carbon containing reducer, the carbon containing reducer consumption is 40%, 4.5% fusing assistant, the mix surface that mixes add according to high intensity magnetic mineral total mass per-cent be 12.5% carbon containing reducer to guarantee reducing atmosphere, compound directly advances reducing roasting: maturing temperature is 1300 ℃, roasting time 120min; Send the rod mill ore grinding behind the roasted ore naturally cooling, rod milling 20 minutes, grinding particle size accounts for 85% for-200 orders; Obtain fine granule material and tap water be made into ore pulp send into magnetic separator carry out low intensity magnetic separation (magneticstrength 1600Oe) must high grade iron concentrate and mine tailing, iron concentrate grade is up to 92.55%, the rate of recovery is 92.87%.

Claims (3)

1. a method that reclaims iron and produce the high grade iron fine powder from rare-earth tailing is characterized in that, specifically may further comprise the steps:
Step 1. high magnetic pre-selection enrichment: be the 200-325 order with rare-earth tailing wet type rod milling to granularity, then in High gradient high intensity magnetic separator in magneticstrength: 7000-13000Oe carries out magnetic separation, high intensity magnetic mineral after the magnetic separation is carried out reducing roasting, for subsequent use, the further recovering rare earth in the strong magnetic tail of gained ore deposit and other valuable constituent;
Step 2. batch mixing: in the high intensity magnetic mineral that step 1 prepares, add according to the carbon containing reducer of mass percent 10%-40%, the fusing assistant of 3%-5%, mix, the mix surface that then mixes is added the carbon containing reducer of 10%-15% to guarantee reducing atmosphere;
Step 3. reducing roasting: the compound that step 2 is obtained send retort furnace, carries out reducing roasting, and maturing temperature is 1000-1300 ℃, and roasting time is 30-120min, obtains roasted ore;
Step 4. low intensity magnetic separation: with roasted ore naturally cooling, wet type rod milling that step 3 obtains, the rod milling time is 5-20min, then magnetic separation in weak magnetic separator, the magnetic separation field intensity: the 1200-1600 oersted, obtain grade greater than 90%, the rate of recovery is greater than 90% iron ore concentrate.
2. a kind of method that reclaims iron from rare-earth tailing according to claim 1, it is characterized in that: described carbon containing reducer is one or both mixing in coke, hard coal, bituminous coal, the brown coal.
3. a kind of method that reclaims iron from rare-earth tailing according to claim 1, it is characterized in that: described fusing assistant is lime.
CN2012103858833A 2012-10-12 2012-10-12 Method for recovering iron from rare-earth tailings and producing high-grade fine iron powder Pending CN102876882A (en)

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Cited By (11)

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CN103103341A (en) * 2013-01-29 2013-05-15 东北大学 Control method of iron particle granularity in deep reduction material
CN103173610A (en) * 2013-03-26 2013-06-26 东北大学 Method for proper reduction-weak magnetic separation of iron and rare earth in rare earth tailings
CN103276193A (en) * 2013-06-21 2013-09-04 山东鲁铭高温材料科技有限公司 Method and device for preparing powdered iron through magnetizing low-iron red mud
CN103272685A (en) * 2013-05-15 2013-09-04 包钢集团矿山研究院(有限责任公司) Mineral separation process for recycling iron and rare earth in baotite oxidized ore flotation tailings
CN103316771A (en) * 2013-05-23 2013-09-25 包钢集团矿山研究院(有限责任公司) Ore dressing process of recovering columbium mineral from baotite dressed rare earth tailings
CN104611541A (en) * 2015-02-05 2015-05-13 东北大学 Method for leaching rare earth from tailings of iron ore dressing
CN107233998A (en) * 2017-07-05 2017-10-10 徐忠 It is a kind of that Iron concentrate, the method for magnetic iron ore are extracted from tailings
CN107930637A (en) * 2017-12-05 2018-04-20 内蒙古科技大学 A kind of high entropy solid solution catalyst of rare-earth-based iron content and preparation method thereof
CN108034964A (en) * 2017-12-20 2018-05-15 宁波市鄞州智伴信息科技有限公司 A kind of technique for being separated from Rare Earth Mine and extracting phosphorus yttrium element
CN108787159A (en) * 2018-05-22 2018-11-13 北京矿冶科技集团有限公司 A kind of synthetical recovery beneficiation method of low-grade uranium-bearing polymetallic ore
CN111410576A (en) * 2020-03-16 2020-07-14 华南理工大学 Method for realizing asbestos tailing detoxification and recycling by using activation and co-reduction method

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Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103103341A (en) * 2013-01-29 2013-05-15 东北大学 Control method of iron particle granularity in deep reduction material
CN103173610A (en) * 2013-03-26 2013-06-26 东北大学 Method for proper reduction-weak magnetic separation of iron and rare earth in rare earth tailings
CN103272685A (en) * 2013-05-15 2013-09-04 包钢集团矿山研究院(有限责任公司) Mineral separation process for recycling iron and rare earth in baotite oxidized ore flotation tailings
CN103272685B (en) * 2013-05-15 2015-09-30 包钢集团矿山研究院(有限责任公司) The ore-dressing technique of iron and rare earth is reclaimed in baotite oxide ore flotation mine tailing
CN103316771A (en) * 2013-05-23 2013-09-25 包钢集团矿山研究院(有限责任公司) Ore dressing process of recovering columbium mineral from baotite dressed rare earth tailings
CN103316771B (en) * 2013-05-23 2015-06-03 包钢集团矿山研究院(有限责任公司) Ore dressing process of recovering columbium mineral from baotite dressed rare earth tailings
CN103276193A (en) * 2013-06-21 2013-09-04 山东鲁铭高温材料科技有限公司 Method and device for preparing powdered iron through magnetizing low-iron red mud
CN104611541A (en) * 2015-02-05 2015-05-13 东北大学 Method for leaching rare earth from tailings of iron ore dressing
CN104611541B (en) * 2015-02-05 2017-01-04 东北大学 A kind of method leaching rare earth in iron selection tailings
CN107233998A (en) * 2017-07-05 2017-10-10 徐忠 It is a kind of that Iron concentrate, the method for magnetic iron ore are extracted from tailings
CN107930637A (en) * 2017-12-05 2018-04-20 内蒙古科技大学 A kind of high entropy solid solution catalyst of rare-earth-based iron content and preparation method thereof
CN108034964A (en) * 2017-12-20 2018-05-15 宁波市鄞州智伴信息科技有限公司 A kind of technique for being separated from Rare Earth Mine and extracting phosphorus yttrium element
CN108034964B (en) * 2017-12-20 2019-09-06 精细化学品集团有限公司 A kind of technique for being separated from Rare Earth Mine and extracting phosphorus yttrium element
CN108787159A (en) * 2018-05-22 2018-11-13 北京矿冶科技集团有限公司 A kind of synthetical recovery beneficiation method of low-grade uranium-bearing polymetallic ore
CN108787159B (en) * 2018-05-22 2020-09-25 北京矿冶科技集团有限公司 Comprehensive recovery beneficiation method for low-grade uranium-bearing polymetallic ore
CN111410576A (en) * 2020-03-16 2020-07-14 华南理工大学 Method for realizing asbestos tailing detoxification and recycling by using activation and co-reduction method

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Application publication date: 20130116