CN102839278B - Method for extracting iron from iron mine tailings through strong magnetic, pre-concentration deep reduction - Google Patents
Method for extracting iron from iron mine tailings through strong magnetic, pre-concentration deep reduction Download PDFInfo
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Abstract
The invention discloses a method for extracting iron from iron mine tailings through strong magnetic separation, pre-concentration deep reduction, belonging to the comprehensive utilization field of tailings. The method comprises the following steps: carrying out wet-process levigation and strong magnetic separation on the iron mine tailings with 10%-25% of residual iron to acquire pre-concentrated iron tailings concentrate with grade of 35%-45% and recovery rate of 80-85%, wherein the content of residual iron in secondary tailings is 3-6%; mixing the pre-concentrated tailings concentrate with a reducing agent and a reducing assistant, so as to carry out deep reduction in a sealed kiln furniture container of an oxidizing atmosphere kiln or a reducing atmosphere kiln, wherein in the oxidizing atmosphere kiln, the reducing temperature is 1150 DEG C to 1350 DEG C, and the reducing time is 0.5 to 10 hours; in the reducing atmosphere kiln, the reducing temperature 1250 DEG C to 1450 DEG C and the reducing time is 0.1 to 1 hour; and carrying out wet-process grinding and magnetic separation on the cooled reduced material to obtain metal iron powder with total iron grade of 90%-95%, and recovery rate of 90%-99%. With the adoption of the method, the content of residual iron in the secondary tailings is greatly reduced while the problem of recycling much residual iron in the iron tailings is solved.
Description
Technical field
The invention belongs to the comprehensive utilization of tailing field, particularly relate to the strong magnetic pre-concentration of a kind of iron ore mine drastic reduction and put forward the iron technology.
Background technology
Along with the progress of technique of preparing and riseing fast of iron ore concentrate price, enterprise relied on technical progress and improved beneficiation cost, the rate of recovery is improved constantly, but still contain 10%～15% remainder fe in the mine tailing of discharging in recent years.Under existing technique of preparing, no matter be the economic worth that the early stage tailing of getting rid of and the iron in the new mine tailing of discharging at present all do not possess further sorting.Be that particulate rhombohedral iron ore during the Anshan type magnetite quartzite is built is main deposit type such as, Anshan iron and steel plant Qidashan iron ore, belong to a kind of in the utmost point refractory iron ore.Remainder fe content is 15%～25% in the early stage mine tailing of discharging.Yet only the mine tailing in the neat mountain mine tailing storehouse just contains the remainder fe more than 1,000 ten thousand tons, and the remainder fe that contains in the similar mine tailing of the whole Anshan Area storehouse is above 100,000,000 tons.High remainder fe content has also hindered the further comprehensive utilization of mine tailing in fields such as building materials in the mine tailing in addition.Therefore the new technology of urgent need exploitation reduces the remainder fe content in the secondary mine tailing significantly in the abundant residues iron in reclaiming mine tailing, for the green high added value building materials of mine tailing production lay the foundation.
Patent of invention " novel process for recycling Anshan type lean octahedral iron ore mine tailing " (publication number CN 101318159A), relate to a kind of Anshan type lean octahedral iron ore mine tailing and reclaim technology, adopt the single magnetic separation novel process of magnetic-Tuo-magnetic-Tuo-magnetic five stages of magnetic separation, dusting cover self-circulation to reclaim mine tailing, this technique process is more, flow process is longer, the facility investment volume is bigger, does not relate to the recovery technology to iron in the thin rhombohedral iron ore mine tailing of magnetite quartzite type.And patent of invention " a kind of method of from lean hematite ore, carrying iron " (publication number CN 101509082A), the TFe grade of the lean hematite ore sample ore of getting is 44%～54.13%, with lean hematite ore and coal dust roasting drastic reduction, by magnetic separation obtain grade 85%～95% iron-containing product.This patent is a kind of method of utilizing of lean hematite ore raw ore, does not relate to full iron grade about 10%～25%, and the thinner magnetite quartzite type rhombohedral iron ore mine tailing of granularity reclaims problem.Patent of invention " the Anshan type iron tailings reclaims novel process " (publication number CN 102228862 A) adopts magnetic-Tuo-sieve-magnetic-centrifuging process, and plant tailing sample ore grade 12%～14% reclaims gained concentrate grade 64%～66%.This patent does not provide the rate of recovery of gained concentrate product, does not relate to the recovery technology of iron in the magnetite quartzite type rhombohedral iron ore mine tailing.
Summary of the invention
The present invention will in solving the recovery iron ore mine in the abundant residues iron, reduce the content of remainder fe in the mine tailing, for further the secondary mine tailing being laid the foundation for the production of green high added value building materials significantly.
The strong magnetic pre-concentration of a kind of iron ore mine drastic reduction is put forward the iron method, may further comprise the steps:
(1) ore grinding and high intensity magnetic separation: it is levigate that iron ore mine is carried out wet method, obtain mass concentration 55%～75%, and grinding particle size accounts for 80%～88% ore pulp for-0.037mm, ore pulp placed under 700kA/m～900 kA/m conditions carry out high intensity magnetic separation, wherein the grade of pre-concentration tail concentrate iron is 35%～45% behind the high intensity magnetic separation, the rate of recovery 80～85%, the content of remainder fe is 3%～6% in the secondary mine tailing.The composition range of iron ore mine is: all iron content is 10%～25%, and wherein the vignite iron level accounts for 30%～50% of all iron content, and the iron in red (brown) iron ore accounts for 40%～65% of all iron content; Quartz content is 40%～75%, and sulphur content is 0～0.15%, and phosphorus content is 0～0.15%.(annotate: because full iron is made up of the iron in vignite, red (brown) iron ore, iron carbonate, iron sulphide, ferric metasilicate and the pyrrhotite, all iron content is 10%～25% to be converted into the ferriferous oxide weight percent and to reach 25%～60%, adds that quartz content weight can reach 100%)
(2) drastic reduction batching: be that the reductive agent of 0～5mm and the auxiliary agent that reduces mix with the pre-concentration tail concentrate behind the high intensity magnetic separation of step (1) gained and granularity, obtain the drastic reduction compound; Wherein the add-on of reductive agent be behind the high intensity magnetic separation pre-concentration tail concentrate butt quality 10%～30%; The add-on of reduction auxiliary agent is 10%～20% of pre-concentration tail concentrate butt quality.
(3) reduction: in oxidizing atmosphere kiln or reducing atmosphere kiln, carry out drastic reduction.When in the oxidizing atmosphere kiln, carrying out drastic reduction, with the drastic reduction compound of step (2) gained pack into the sealing the kiln furnitures container, the kiln furnitures container that installs material is put into the oxidizing atmosphere kiln, through preheating, heating, high temperature reduction insulation, process of cooling.The temperature of material insulation reduction in high-temperature zone in the oxidizing atmosphere kiln is 1150 ℃～1350 ℃, and mixture mainly carries out drastic reduction in this temperature, and the recovery time is 0.5～10 hour.When in the reducing atmosphere kiln, carrying out drastic reduction, with behind finish mix of the drastic reduction compound of step (2) gained or the pellet directly spreading in the kiln bottom, then through preheating, heating, high temperature reduction insulation, process of cooling.The temperature of material insulation reduction in high-temperature zone in the reducing atmosphere kiln is 1250 ℃～1450 ℃, and mixture mainly carries out drastic reduction in this temperature, and the recovery time is 0.1～1 hour.
(4) cooling discharging: for the oxidizing atmosphere kiln, after waiting to fill the sealing kiln furnitures container cooling of reduction back material, the kiln furnitures container of the material behind the drastic reduction together with sealing taken out from kiln, and unload material.For the reducing atmosphere kiln, after the material cooling of back to be restored, the material behind the drastic reduction is directly drawn off from kiln.
(5) ore grinding and low intensity magnetic separation: the reduction material after step (4) cooling drawn off joins and carries out wet milling in the grinding machine, obtain mass concentration 50%～70%, grinding particle size accounts for 85%～95% ore pulp for-0.074mm, it is to carry out magnetic separation under 150 kA/m～200 kA/m conditions that ore pulp is placed magneticstrength, the ferrous metal that recovery is reduced, the full iron grade of metal iron powder that obtains is 90%～95%, and the rate of recovery of iron is 90%～99%.
The described reductive agent of step (2) is bituminous coal or hard coal or brown coal or bone coal or stalk carbon dust.The composite reduction auxiliary agent that described reduction auxiliary agent is industrial sodium carbonate and unslaked lime.Wherein CaO and Na
2CO
3Mass ratio be 1:0.2～1.
Beneficial effect of the present invention:
(1) iron-bearing mineral that can be effectively from iron ore mine, reclaims weak magnetic.Reclaim the grade of back iron product more than 90%, the rate of recovery is more than 70%.Avoiding the higher coke of use cost is reductive agent, but is reductive agent with cost low coal or stalk carbon dust;
(2) in solving the recovery iron ore mine, in the abundant residues iron difficult problem, reduce the content of remainder fe in the mine tailing significantly, for further the secondary mine tailing being laid the foundation for the production of green high added value building materials.
Description of drawings
Fig. 1 carries the process flow sheet of iron technology for the strong magnetic pre-concentration of a kind of iron ore mine of the present invention drastic reduction.
Embodiment
The composition range of the Anshan iron and steel plant Qidashan iron ore mine tailing of implementing is: all iron content is 14.79%, and wherein Armco magnetic iron content accounts for 37.18% of all iron content, and the iron in red (brown) iron ore accounts for 40.65% of all iron content; Quartz content is 72.12%, and sulphur content is 0.02%, and phosphorus content is 0.038%.
Embodiment 1
(1) ore grinding and high intensity magnetic separation: it is levigate that the neat mountain mine tailing of the Anshan iron and steel plant of remainder fe content 14.79% is carried out wet method, obtain mass concentration 65%, and grinding particle size accounts for 86% ore pulp for-0.037mm, ore pulp placed under the 803.15 kA/m conditions carry out high intensity magnetic separation, wherein the grade of pre-concentration tail concentrate iron is 42.90% behind the high intensity magnetic separation, the rate of recovery 84.8%, the content of remainder fe is 5.2% in the secondary mine tailing.
(2) drastic reduction batching: be that the reductive agent of 0～3mm and the auxiliary agent that reduces mix with the pre-concentration tail concentrate behind the high intensity magnetic separation of step (1) gained and granularity, obtain the drastic reduction compound; Wherein the add-on of reductive agent be behind the high intensity magnetic separation pre-concentration tail concentrate butt quality 25%; The add-on of reduction auxiliary agent is 15% of pre-concentration tail concentrate butt quality.
(3) reduction: in the oxidizing atmosphere kiln, carry out drastic reduction.With the kiln furnitures container that the drastic reduction compound of step (2) gained is packed into and sealed, the kiln furnitures container that installs material is put into the oxidizing atmosphere kiln, through preheating, heating, high temperature reduction insulation, process of cooling.The temperature of material insulation reduction in high-temperature zone in the oxidizing atmosphere kiln is 1250 ℃, and mixture mainly carries out drastic reduction in this temperature, and the recovery time is 50 minutes.
(4) cooling discharging: after waiting to fill the sealing kiln furnitures container cooling of reduction back material, the kiln furnitures container of the material behind the drastic reduction together with sealing taken out from kiln, and unload material.
(5) ore grinding and low intensity magnetic separation: the reduction material after step (4) cooling drawn off joins and carries out wet milling in the grinding machine, obtains mass concentration 60%, and grinding particle size accounts for 66.35% ore pulp for-0.074mm.It is to carry out magnetic separation under the 159.11 kA/m conditions that ore pulp is placed magneticstrength, reclaims the ferrous metal that is reduced, and the full iron grade of the metal iron powder of acquisition is 93.53%, and the rate of recovery of iron is 93.82%.
The described reductive agent of step (2) is bituminous coal, the composite reduction auxiliary agent that described reduction auxiliary agent is industrial sodium carbonate and unslaked lime.Wherein CaO and Na
2CO
3Mass ratio be 1:0.5.
Embodiment 2
(1) ore grinding and high intensity magnetic separation: it is levigate that the neat mountain mine tailing of the Anshan iron and steel plant of remainder fe content 14.79% is carried out wet method, obtain mass concentration 65%, and grinding particle size accounts for 84% ore pulp for-0.037mm, ore pulp placed carry out high intensity magnetic separation under the 835.32kA/m condition, wherein the grade of pre-concentration tail concentrate iron is 39.97% behind the high intensity magnetic separation, the rate of recovery 87.91%, the content of remainder fe is 5.35% in the secondary mine tailing.
(2) drastic reduction batching: be that the reductive agent of 0～3mm and the auxiliary agent that reduces mix with the pre-concentration tail concentrate behind the high intensity magnetic separation of step (1) gained and granularity, obtain the drastic reduction compound; Wherein the add-on of reductive agent be behind the high intensity magnetic separation pre-concentration tail concentrate butt quality 17.5%; The add-on of reduction auxiliary agent is 21% of pre-concentration tail concentrate butt quality.
(3) reduction: in the oxidizing atmosphere kiln, carry out drastic reduction.With the kiln furnitures container that the drastic reduction compound of step (2) gained is packed into and sealed, the kiln furnitures container that installs material is put into the oxidizing atmosphere kiln, through preheating, heating, high temperature reduction insulation, process of cooling.The temperature of material insulation reduction in high-temperature zone in the oxidizing atmosphere kiln is 1350 ℃, and mixture mainly carries out drastic reduction in this temperature, and the recovery time is 30 minutes.
(4) cooling discharging: after waiting to fill the sealing kiln furnitures container cooling of reduction back material, the kiln furnitures container of the material behind the drastic reduction together with sealing taken out from kiln, and unload material.
(5) ore grinding and low intensity magnetic separation: the reduction material after step (4) cooling drawn off joins and carries out wet milling in the grinding machine, obtains mass concentration 60%, and grinding particle size accounts for 66.35% ore pulp for-0.074mm.It is to carry out magnetic separation under the 159.11 kA/m conditions that ore pulp is placed magneticstrength, reclaims the ferrous metal that is reduced, and the full iron grade of the metal iron powder of acquisition is 94.23%, and the rate of recovery of iron is 98.05%.
The described reductive agent of step (2) is bituminous coal, the composite reduction auxiliary agent that described reduction auxiliary agent is industrial sodium carbonate and unslaked lime.Wherein CaO and Na
2CO
3Mass ratio be 1:0.4.
Embodiment 3
(1) ore grinding and high intensity magnetic separation: it is levigate that the neat mountain mine tailing of the Anshan iron and steel plant of remainder fe content 14.79% is carried out wet method, obtain mass concentration 65%, and grinding particle size accounts for 63.68% ore pulp for-0.037mm, ore pulp placed under the 812.10 kA/m conditions carry out high intensity magnetic separation, wherein the grade of pre-concentration tail concentrate iron is 37.63% behind the high intensity magnetic separation, the rate of recovery 82.93 %, the content of remainder fe is 3.71% in the secondary mine tailing.
(2) drastic reduction batching: be that the reductive agent of 0～3mm and the auxiliary agent that reduces mix with the pre-concentration tail concentrate behind the high intensity magnetic separation of step (1) gained and granularity, obtain the drastic reduction compound; Wherein the add-on of reductive agent be behind the high intensity magnetic separation pre-concentration tail concentrate butt quality 17.5%; The add-on of reduction auxiliary agent is 6% of pre-concentration tail concentrate butt quality; The add-on of binding agent be behind the high intensity magnetic separation pre-concentration tail concentrate butt quality 2.5% and add the water account for whole material butt quality 8%, make diameter with briquetting press behind the mixing and highly be the small column briquetting of 20mm.
(3) reduction: in the reducing atmosphere kiln, carry out drastic reduction.When carrying out drastic reduction in the reducing atmosphere kiln, be tiled in the kiln bottom after the small column briquetting oven dry with step (2) gained, bed thickness is 30mm, then through preheating, heating, high temperature reduction insulation, process of cooling.The temperature of material insulation reduction in high-temperature zone in the reducing atmosphere kiln is 1300 ℃, and mixture mainly carries out drastic reduction in this temperature, and the recovery time is 10 minutes.
(4) cooling discharging: after the material cooling of back to be restored, the material behind the drastic reduction is directly drawn off from kiln.
(5) ore grinding and low intensity magnetic separation: the reduction material after step (4) cooling drawn off joins and carries out wet milling in the grinding machine, obtains mass concentration 60%, and grinding particle size accounts for 65.20% ore pulp for-0.074mm.It is to carry out magnetic separation under the 151.15 kA/m conditions that ore pulp is placed magneticstrength, reclaims the ferrous metal that is reduced, and the full iron grade of the metal iron powder of acquisition is 93.04%, and the rate of recovery of iron is 95.50%.
The described reductive agent of step (2) is bituminous coal, the composite reduction auxiliary agent that described reduction auxiliary agent is industrial sodium carbonate and unslaked lime.Wherein CaO and Na
2CO
3Mass ratio be 1:0.4.Used binding agent is Xylo-Mucine (CMC).
Claims (3)
1.
OnePlant iron ore mine high intensity magnetic separation pre-concentration drastic reduction and put forward the iron method, it is characterized in that, specifically may further comprise the steps:
(1) it is levigate iron ore mine to be carried out wet method, obtain mass concentration 55%～75%, and grinding particle size accounts for 80%～88% ore pulp for-0.037mm, ore pulp placed under 700kA/m～900 kA/m conditions carry out high intensity magnetic separation, wherein the grade of pre-concentration tail concentrate iron is 35%～45% behind the high intensity magnetic separation, the rate of recovery 80～85%, the content of remainder fe is 3%～6% in the secondary mine tailing; The composition range of iron ore mine is: all iron content is 10%～25%, and wherein the vignite iron level accounts for 30%～50% of all iron content, and the iron in the red or limonite accounts for 40%～65% of all iron content; Quartz content is 40%～75%, and sulphur content is 0～0.15%, and phosphorus content is 0～0.15%; Described iron ore mine is Anshan iron and steel plant Qidashan iron ore mine tailing;
(2) drastic reduction batching: be that the following reductive agent of 5mm and the auxiliary agent that reduces mix with the pre-concentration tail concentrate behind the high intensity magnetic separation of step (1) gained and granularity, obtain the drastic reduction compound; Wherein the add-on of reductive agent be behind the high intensity magnetic separation pre-concentration tail concentrate butt quality 10%～30%; The add-on of reduction auxiliary agent is 10%～20% of pre-concentration tail concentrate butt quality;
(3) reduction: in oxidizing atmosphere kiln or reducing atmosphere kiln, carry out drastic reduction; When in the oxidizing atmosphere kiln, carrying out drastic reduction, with the drastic reduction compound of step (2) gained pack into the sealing the kiln furnitures container, the kiln furnitures container that installs material is put into the oxidizing atmosphere kiln, through preheating, heating, high temperature reduction insulation, process of cooling; The temperature of material insulation reduction in high-temperature zone in the oxidizing atmosphere kiln is 1150 ℃～1350 ℃, and mixture carries out drastic reduction in this temperature, and the recovery time is 0.5～10 hour; When in the reducing atmosphere kiln, carrying out drastic reduction, with finish mix of the drastic reduction compound of step (2) gained or the direct spreading of pellet in the kiln bottom, the thickness of material is 10～30 mm, then through preheating, heating, high temperature reduction insulation, process of cooling; The temperature of high-temperature zone insulation reduction is 1250 ℃～1450 ℃ in the reducing atmosphere kiln, and mixture carries out drastic reduction in this temperature, and the recovery time is 0.1～1 hour;
(4) cooling discharging: for the oxidizing atmosphere kiln, after waiting to fill the sealing kiln furnitures container cooling of reduction back material, the kiln furnitures container of the material behind the drastic reduction together with sealing taken out from kiln, and unload material; For the reducing atmosphere kiln, after the material cooling of back to be restored, the material behind the drastic reduction is directly drawn off from kiln;
(5) ore grinding and low intensity magnetic separation: the reduction material after step (4) cooling drawn off joins and carries out wet milling in the grinding machine, obtain mass concentration 50%～70%, grinding particle size accounts for 85%～95% ore pulp for-0.074mm, it is to carry out magnetic separation under 150 kA/m～200 kA/m conditions that ore pulp is placed magneticstrength, the ferrous metal that recovery is reduced, the full iron grade of metal iron powder that obtains is 90%～95%, and the rate of recovery of iron is 90%～99%.
2. a kind of iron ore mine high intensity magnetic separation pre-concentration drastic reduction according to claim 1 is put forward the iron method, it is characterized in that: described reductive agent is bituminous coal or hard coal or brown coal or stalk carbon dust.
3. a kind of iron ore mine high intensity magnetic separation pre-concentration drastic reduction according to claim 1 is put forward the iron method, it is characterized in that: the composite reduction auxiliary agent that described reduction auxiliary agent is industrial sodium carbonate and unslaked lime; Wherein CaO and Na
2CO
3Mass ratio be 1:0.2～1.
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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 |
| CN103397128B (en) * | 2013-08-02 | 2015-07-15 | 北京科技大学 | Method used for extracting iron from red mud by drastic reduction and method used for preparing gel material from secondary tailings |
| CN104480301A (en) * | 2014-11-21 | 2015-04-01 | 北京科技大学 | Method for reducing iron tailings and enriching tail concentrate by taking steel slag as additive |
| CN104689903A (en) * | 2015-01-29 | 2015-06-10 | 鞍钢集团矿业公司 | Method for improving iron grade in iron ore direct-flotation tailings |
| CN104588202A (en) * | 2015-01-29 | 2015-05-06 | 鞍钢集团矿业公司 | Beneficiation method for extremely lean iron ore pre-separation tailings |
| CN104588203A (en) * | 2015-01-29 | 2015-05-06 | 鞍钢集团矿业公司 | Beneficiation method for refractory iron ores |
| CN105522160A (en) * | 2015-12-11 | 2016-04-27 | 北京科技大学 | Preparation method for reduced iron powder |
| CN113789422A (en) * | 2021-11-17 | 2021-12-14 | 唐山冀东装备工程股份有限公司 | Tailing resource utilization method and system |
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