CN104099465B - A kind of high-phosphor oolitic hematite self catalyzed reduction is produced the method for high-purity reduced iron powder - Google Patents
A kind of high-phosphor oolitic hematite self catalyzed reduction is produced the method for high-purity reduced iron powder Download PDFInfo
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Abstract
The invention provides a kind of method that high-phosphor oolitic hematite self catalyzed reduction is produced high-purity reduced iron powder, belong to engineering of comprehensive utilization of mineral field. The method is by powdered iron ore and reducing agent, binding agent mixed pelletizing by a certain percentage, and carbonaceous pelletizing is reduction roasting at high temperature, carries out multistage grinding, low intensity magnetic separation after cooling, magnetic tailing is carried out to middle magnetic and scan, and scavenger concentrate returns in raw ore pelletizing. This part feature of returning to product is fine size and contains a small amount of metallic iron, therefore can play two kinds of effects: fine size can improve the intensity of pelletizing in pelletizing process; And in roasting process, thereby metallic iron promotes the reduction of iron ore on the one hand by catalysis coal gasification, can also serve as on the other hand the nucleator of newly-generated metallic iron, thereby promote the agglomeration of metallic iron. This technique is compared with current coal-based direct reduction-magnetic separation process, and iron recovery and iron grade all obviously improve, and iron recovery and iron grade all can reach more than 95%.
Description
Technical field
The present invention relates to engineering of comprehensive utilization of mineral field, refer to especially a kind of high-phosphor oolitic hematite self-catalysisThe also method of the high-purity reduced iron powder of original production.
Background technology
In recent years, along with the quick consumption of easy iron ore resource, how to utilize various refractory iron ore resourcesAs high-phosphor oolitic iron ore, high alumolimonite etc. become ore dressing, one, a metallurgical boundary difficult problem in the urgent need to address.Adopting traditional ore dressing means to sort these refractory iron ores is difficult to obtain and meets the concentrate that blast furnace ironmaking requires.Researcher adopted coal-based direct reduction-magnetic separation technology to process these ferrous materials in the last few years, in this workIn skill, the iron mineral of weak magnetic, fine-grained dissemination is converted into coarse grain, ferromagnetic metallic iron, then passes throughOre grinding, magnetic separation are reclaimed. Adopt the reduced iron product iron content that this technique obtains can reach more than 90%,And the whole process rate of recovery is generally more than 85%, far above conventional ore dressing-smelting flow process, this iron producesProduct can partly substitute steel scrap as electric furnace steel making raw material. This technique is that the exploitation of refractory iron ore are openedWard off new approach.
But in this technique, in order to realize the metallic iron product of high efficiente callback and acquisition high-quality, conventionallyNeed to add alkali metal containing or alkaline-earth metal material as additive, as sodium carbonate, sodium sulphate etc. These addAdd agent and mainly contain two aspect effects, the one, catalysis coal gasification, thereby the reduction of promotion iron mineral, improve iron and returnYield; The secondth, as flux, optimize the agglomeration condition of iron granule, thereby optimization impurityRemove (as dephosphorization, dealuminzation), improve the quality of products. Although adopt these additives to have as above advantage,Also to have increased production cost.
Meanwhile, in patent or paper in the past, researcher conventionally to roasted product adopt one section orMultistage grinding, magnetic separation obtain last high-grade reduced iron concentrate, but to roughly selecting and the mine tailing of selected operationProcessing do not explain. Rougher tailings iron content is 5%～15%, cleaner tailings iron content 20%～40%, this partIron in mine tailing is also mainly to exist with metallic iron, but because granularity superfine (conventionally below 10 μ m),In low intensity magnetic separation process, be difficult to be captured and enter into mine tailing, having caused the waste of resource.
Therefore, the present invention by roughly select and concentrate mine tailing in iron further reclaim, simultaneously as additiveAdd in pelletizing process, not only can Substitute For Partial additive, optimize direct-reduction roasting process, also carryThe high rate of recovery of metallic iron, significant for effectively utilizing of iron ore resource.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of high-phosphor oolitic hematite self catalyzed reduction and produces highThe method of pure reduced iron powder.
The main processes of the method is as follows: first, the powdery high-phosphor oolitic by granularity below 2mm is redReducing agent coal below 2mm of iron ore and granularity, Dephosphorising agent are according to 1:(0.15～0.3): (0.15～0.25)Mass ratio mix, then add 8%～12% water, after mixing, on ball press, be pressed into carbonaceous pelletizing;Then dry carbonaceous pelletizing is carried out to direct-reduction roasting, after the pelletizing fragmentation after roasting through primary grindingAfter-low intensity magnetic separation, obtain one section of concentrate and one section of mine tailing; The one section of concentrate obtaining is after secondary grinding-low intensity magnetic separationObtain reduced iron powder (iron grade is greater than 90%, and phosphorus content is less than 0.1%) and two sections of mine tailings; Obtain one sectionMine tailing directly carries out middle magnetic to be scanned, and obtains scavenger concentrate and mine tailing; By two sections of mine tailings that obtain and scavenger concentrateAfter merging, turn back to the pressure ball process that mixes, continue to participate in pelletizing; Now, the interpolation scope of Dephosphorising agent is contracted to10%～20%, then pass through direct-reduction roasting-ore grinding-magnetic separation process same as described above, high-purity the going back obtainingFormer iron powder (iron grade is greater than 95%, and iron recovery is greater than 95%, and phosphorus content is less than 0.1%), two of generationSection mine tailing and scavenger concentrate turn back to the pressure ball process that mixes after merging.
Wherein, in high-phosphor oolitic hematite, iron grade is lower than 45%, and phosphorus content is higher than 0.6%; Dephosphorising agent is for disappearingThe combination of lime and sodium carbonate, the mass ratio of its medium-slaking lime and sodium carbonate is 5:1; Dry carbonaceous pelletizingThe temperature range of direct-reduction roasting is 1150 DEG C～1250 DEG C, and the time of reduction roasting is 20～60min;The ore milling concentration of primary grinding and secondary grinding is 60%～70%; Primary grinding fineness accounts for for-0.074mm60%～80%, secondary grinding fineness accounts for 85%～95% for-0.074mm; The magnetic field intensity scope of low intensity magnetic separation is80～110kA/m, the magnetic field intensity scope that middle magnetic is scanned is 140～160kA/m.
Principle of the present invention is: in one section of mine tailing, iron mainly exists with the form of metallic iron, but granularityConventionally below 10 μ m, can effectively reclaim by improving magnetic field intensity scanning operation. And two sections of mine tailingsContain equally fine-graded metallic iron, two sections of mine tailings and scavenger concentrate mix and make with powdery high-phosphor oolitic hematiteBall, can improve the balling-up of material, improves pellet strength. Metallic iron is the catalyst of coal gasification in addition,And coal gasification reaction is the important control step of carbonaceous pelletizing direct-reduction calcination, so add this portionDivide after the product of containing metal iron, thereby can catalysis coal gasification promote iron mineral reduction, improve the rate of recovery of iron.Meanwhile, this part iron granule can be used as the nucleator of newly-generated metallic iron, promotes iron granuleGrow up, its effect is similar with the at present alkali metal of interpolation or the effect of alkaline-earth metal salt, therefore can riseTo part or the effect of replacing whole additive.
Utilize process of the present invention effectively from high-phosphor oolitic hematite, to obtain iron content more than 95%,Iron recovery is higher than 95%, phosphorous below 0.1%, and other impurity contents meet iron-making and steel-making raw material standardMetal iron powder. Compared with the conventional method, the inventive method has following features: (1) has comprehensively been reclaimed and roughly selectedFerrous components in mine tailing and two sections of mine tailings, reaches more than 95% the closed circuit flow process rate of recovery, apparently higher than currentFlow process; Pelletizing after (2) two sections of mine tailings and scavenger concentrate return and mix with raw ore and reducing agent, has improved materialBalling-up, can reduce consumption of binder; Metallic iron in (3) two sections of mine tailings and scavenger concentrate can be urgedChange coal gasification and serve as the nucleator of newly-generated metallic iron, thereby having promoted reduction and the metallic iron of ferriferous oxideThe growth of particle, the effect of the additive of its effect and alkali metal containing or alkaline-earth metal is similar, thereby can subtractFew additive amount; (4) due to the recovery of one section of mine tailing, reduce the discharge of true tailings, make techniqueMore environmental protection.
Brief description of the drawings
Fig. 1 is the technological process that high-purity reduced iron powder is produced in high-phosphor oolitic hematite self-catalysis of the present invention.
Detailed description of the invention
For making the technical problem to be solved in the present invention, technical scheme and advantage clearer, below in conjunction with attachedFigure and specific embodiment are described in detail.
The present invention is directed to the problems such as existing refractory iron ore is recycled not exclusively, and tailings discharging amount is large, carryA kind of method of producing high-purity reduced iron powder for high-phosphor oolitic hematite self-catalysis.
The technique of as shown in Figure 1, producing high-purity reduced iron powder for high-phosphor oolitic hematite self-catalysis of the present inventionFlow chart, is illustrated for two example two by row as concrete in workflow graph.
Embodiment 1
Certain refractory hematite iron content 38.33%, phosphorous 0.96%. Crushing raw ore, to 100%-2mm, adds 25%Reducing agent coal, add 20% calcium hydroxide and 4% sodium carbonate, 11% left and right that adds water mixes at pair roller type pressesBall machine upper pressing ball, the carbonaceous pelletizing green-ball obtaining is anti-falls intensity average out to 6 times/, compression strength 45N/;Dried dry bulb is anti-, and to fall intensity be 8 times/, and compression strength is 350N/. Then in Muffle furnace 1200Reduction roasting 40min at DEG C. The cooling rear be first crushed to-2mm of roasted ore, then adopts stage grinding, sorts,Primary grinding concentration is 68%, and fineness accounts for 65% for-0.074mm, and secondary grinding concentration is 62%, and fineness is-0.074mm accounts for 95%, and two stages of magnetic separation field intensity is intensity 89.6kA/m. Final acquisition iron grade is 91.12%,Iron recovery is 85.32%, and other impurity contents meet the reduced iron powder of steel-making requirements, and obtains two sections of tailsOre deposit.
By one section of mine tailing, adopt the field intensity of 150kA/m to carry out middle magnetic and scan, obtain iron content 51%, iron reclaimsRate is 12% chats product. By this chats product and two sections of mine tailings pelletizing together with raw ore and reducing agent,Calcium hydroxide consumption is 10%, and sodium carbonate amount is 2%, the carbon containing obtaining under the identical condition of other pressure ball conditionsPelletizing green-ball is anti-falls intensity average out to 7.5 times/, compression strength 66N/; Dried dry bulb is anti-to be fallen by forceDegree is 10 times/, and compression strength is 450N/. Pelletizing is processed through aforementioned flow process again, finally obtainsIron content 95.60%, iron recovery 97.79%, phosphorus content 0.05%, other impurity contents meet steel-making to be wantedHigh-purity reduced iron powder of asking.
Embodiment 2
Certain high-phosphor oolitic hematite, iron content 43.33%, phosphorous 0.83%. Crushing raw ore is to 100%-1mm,Add 25% reducing agent coal, the calcium hydroxide taking 15% and 3% sodium carbonate are mixed sweetening agent, add water 10%Left and right mixes at roll type ball press upper pressing ball. The carbonaceous pelletizing green-ball that obtains is anti-falls intensity average out to 5 times/Individual, compression strength 50N/; After pelletizing is dry, anti-to fall intensity be 8 times/, and compression strength is 152N/Individual. Carbonaceous pelletizing is placed in to reduction roasting 50min at 1150 DEG C of Muffle furnaces; Roasted ore is cooling rear first brokenTo-2mm, then adopt stage grinding, sort, primary grinding concentration is 65%, fineness is-0.074mmAccount for 65%, secondary grinding concentration is 60%, and fineness accounts for 95% for-0.074mm, and two stages of magnetic separation field intensity is by forceDegree 89.6kA/m. Final iron content 92.60%, the iron recovery 91.79% of obtaining, phosphorus content 0.07%, itsHis impurity content meets the reduced iron powder of steel-making requirements, and obtains two sections of mine tailings.
By one section of mine tailing, adopt the field intensity of 150kA/m to carry out middle magnetic and scan, obtain iron content 56%, iron reclaimsRate is 12% chats product. By this chats product and two sections of mine tailings pelletizing together with raw ore and reducing agent,Calcium hydroxide consumption is 10%, and sodium carbonate amount is 2%, the carbon containing obtaining in the identical situation of other pressure ball conditionsPelletizing green-ball is anti-falls intensity average out to 6 times/, compression strength 52N/; The anti-intensity of falling of dried dry bulbBe 8 times/, compression strength is 156N/. Pelletizing is processed through aforementioned flow process again, finally obtains ironContent 96.20%, iron recovery 96.43%, phosphorus content 0.06%, other impurity contents meet steel-making requirementsHigh-purity reduced iron powder.
The above is the preferred embodiment of the present invention, it should be pointed out that the common skill for the artArt personnel, not departing under the prerequisite of principle of the present invention, can also make some improvements and modifications,These improvements and modifications also should be considered as protection scope of the present invention.
Claims (1)
1. high-phosphor oolitic hematite self catalyzed reduction is produced a method for high-purity reduced iron powder, it is characterized in that: by powdery high-phosphor ooliticBloodstone with reducing agent, Dephosphorising agent according to 1:(0.15～0.3): the mass ratio of (0.15～0.25) mixes, then adds 8%～12%Water, after mixing, on ball press, be pressed into carbonaceous pelletizing; Then dry carbonaceous pelletizing is carried out to direct-reduction roasting,After pelletizing fragmentation after roasting, after the ore deposit ?low intensity magnetic separation of one section of mill, obtain one section of concentrate and one section of mine tailing; The one section of concentrate warp obtainingCross Er section Mo Kuang ?obtain reduced iron powder and two sections of mine tailings after low intensity magnetic separation; The one section of mine tailing obtaining directly carries out middle magnetic to be scanned, and obtainsScavenger concentrate and mine tailing; After two sections of mine tailings that obtain and scavenger concentrate are merged, turn back to the pressure ball process that mixes, continue to participate in pelletizing;Iron grade in the reduced iron powder obtaining is higher than 90%, and phosphorus content is lower than 0.1%; In described high-phosphor oolitic hematite, iron grade is lowIn 45%, phosphorus content is higher than 0.6%; Powdery high-phosphor oolitic hematite granularity is below 2mm; Described reducing agent is coal, grainDegree is below 2mm; Described Dephosphorising agent is the combination of calcium hydroxide and sodium carbonate, and the mass ratio of its medium-slaking lime and sodium carbonate is 5:1;The temperature range of dry carbonaceous pelletizing direct-reduction roasting is 1150 DEG C～1250 DEG C, and the time of reduction roasting is 20～60min;The ore milling concentration of primary grinding and secondary grinding is 60%～70%; Primary grinding fineness Wei ?0.074mm account for 60%～80%,Secondary grinding fineness Wei ?0.074mm account for 85%～95%; The magnetic field intensity scope of low intensity magnetic separation is 80～110kA/m, and middle magnetic is sweptThe magnetic field intensity scope of choosing is 140～160kA/m; Two sections of mine tailings after roasting and scavenger concentrate are returned to pelletizing after raw ore, whereinThe interpolation scope of Dephosphorising agent is 10%～20%, through direct-reduction Bei Shao ?in high-purity reduced iron powder of obtaining after magnetic separation iron of high gradeIn 95%, iron recovery is higher than 95%, and phosphorus content is lower than 0.1%.
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| CN105200228B (en) * | 2015-09-23 | 2017-09-29 | 神雾科技集团股份有限公司 | A kind of processing method of DRI pelletizings |
| CN105734192B (en) * | 2016-02-24 | 2018-11-20 | 武汉科技大学 | A kind of mineral processing production method of low grade hematite |
| CN105695734A (en) * | 2016-02-24 | 2016-06-22 | 武汉科技大学 | Industrial production method for conducting iron increase and phosphorous reduction on high-phosphorus oolitic hematite |
| CN105803189B (en) * | 2016-05-16 | 2018-06-29 | 贵州大学 | A kind of method of phosphorus in efficient removal high-phosphor oolitic hematite |
| CN106180734A (en) * | 2016-08-01 | 2016-12-07 | 江苏省冶金设计院有限公司 | Prepare the method and system of iron powder |
| CN106994388A (en) * | 2017-04-01 | 2017-08-01 | 安徽工业大学 | It is a kind of to remove the method that difficult iron rough concentrate sulphur phosphorus arsenic reclaims iron simultaneously |
| CN107362902B (en) * | 2017-07-11 | 2019-01-25 | 甘肃酒钢集团宏兴钢铁股份有限公司 | A kind of symbiosis refractory iron ore closed circuit magnetizing roast magnetic separation recovery technique online |
| CN108842056B (en) * | 2018-09-07 | 2020-11-03 | 安徽工业大学 | Method for preparing reduced iron powder by rapidly heating and reducing oolitic hematite |
| CN112430728B (en) * | 2020-10-28 | 2021-09-14 | 钢铁研究总院 | Method for removing phosphorus in high-phosphorus oolitic hematite by sodium reduction oxidation |
| CN113403471B (en) * | 2021-06-23 | 2023-03-10 | 中钢设备有限公司 | Treatment method of high-phosphorus oolitic iron ore |
| CN114134318B (en) * | 2021-12-01 | 2024-01-23 | 中钢设备有限公司 | Method for treating high-phosphorus iron ore |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102162018A (en) * | 2011-05-26 | 2011-08-24 | 吴道洪 | Iron making method by rotary hearth furnace direct reduction-grinding and separation treatment of high-phosphorus oolitic hematite |
| CN103014212A (en) * | 2012-12-21 | 2013-04-03 | 北京科技大学 | Technical method for producing metal iron powder by using carbon-containing high-phosphorus oolitic hematite pellet |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102162018A (en) * | 2011-05-26 | 2011-08-24 | 吴道洪 | Iron making method by rotary hearth furnace direct reduction-grinding and separation treatment of high-phosphorus oolitic hematite |
| CN103014212A (en) * | 2012-12-21 | 2013-04-03 | 北京科技大学 | Technical method for producing metal iron powder by using carbon-containing high-phosphorus oolitic hematite pellet |
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