CN103290205B - A process of separating iron and titanium in seaside titanomagnetite via direct reduction roasting by using coal - Google Patents
A process of separating iron and titanium in seaside titanomagnetite via direct reduction roasting by using coal Download PDFInfo
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- CN103290205B CN103290205B CN201310105123.7A CN201310105123A CN103290205B CN 103290205 B CN103290205 B CN 103290205B CN 201310105123 A CN201310105123 A CN 201310105123A CN 103290205 B CN103290205 B CN 103290205B
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- iron
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- beach
- titanomagnetite
- ore
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 143
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 65
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 title claims abstract description 45
- 239000010936 titanium Substances 0.000 title claims abstract description 45
- 229910052719 titanium Inorganic materials 0.000 title claims abstract description 45
- 238000000034 method Methods 0.000 title claims abstract description 30
- 239000003245 coal Substances 0.000 title claims abstract description 15
- 230000009467 reduction Effects 0.000 title claims abstract description 14
- 230000008569 process Effects 0.000 title abstract description 13
- 239000000654 additive Substances 0.000 claims abstract description 16
- 230000000996 additive effect Effects 0.000 claims abstract description 15
- 238000007885 magnetic separation Methods 0.000 claims abstract description 13
- 238000000926 separation method Methods 0.000 claims abstract description 9
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims abstract description 8
- 239000011230 binding agent Substances 0.000 claims abstract description 8
- 239000002994 raw material Substances 0.000 claims abstract description 8
- 229910021538 borax Inorganic materials 0.000 claims abstract description 4
- 229910000029 sodium carbonate Inorganic materials 0.000 claims abstract description 4
- 235000010339 sodium tetraborate Nutrition 0.000 claims abstract description 4
- 230000002829 reductive effect Effects 0.000 claims description 13
- 239000003795 chemical substances by application Substances 0.000 claims description 12
- 238000000227 grinding Methods 0.000 claims description 9
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 9
- 239000011707 mineral Substances 0.000 claims description 9
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical group O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 5
- 238000003801 milling Methods 0.000 claims description 4
- UQGFMSUEHSUPRD-UHFFFAOYSA-N disodium;3,7-dioxido-2,4,6,8,9-pentaoxa-1,3,5,7-tetraborabicyclo[3.3.1]nonane Chemical compound [Na+].[Na+].O1B([O-])OB2OB([O-])OB1O2 UQGFMSUEHSUPRD-UHFFFAOYSA-N 0.000 claims description 3
- 239000004328 sodium tetraborate Substances 0.000 claims description 3
- 238000013467 fragmentation Methods 0.000 claims description 2
- 238000006062 fragmentation reaction Methods 0.000 claims description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 abstract description 30
- 238000011084 recovery Methods 0.000 abstract description 17
- 239000004408 titanium dioxide Substances 0.000 abstract description 15
- 239000003638 chemical reducing agent Substances 0.000 abstract 3
- 239000000203 mixture Substances 0.000 abstract 1
- BSVBQGMMJUBVOD-UHFFFAOYSA-N trisodium borate Chemical compound [Na+].[Na+].[Na+].[O-]B([O-])[O-] BSVBQGMMJUBVOD-UHFFFAOYSA-N 0.000 abstract 1
- 238000003672 processing method Methods 0.000 description 8
- 239000012141 concentrate Substances 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 230000008676 import Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- GFNGCDBZVSLSFT-UHFFFAOYSA-N titanium vanadium Chemical compound [Ti].[V] GFNGCDBZVSLSFT-UHFFFAOYSA-N 0.000 description 2
- 208000019901 Anxiety disease Diseases 0.000 description 1
- 230000036506 anxiety Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000002817 coal dust Substances 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 238000004939 coking Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 229910001608 iron mineral Inorganic materials 0.000 description 1
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 1
- YDZQQRWRVYGNER-UHFFFAOYSA-N iron;titanium;trihydrate Chemical compound O.O.O.[Ti].[Fe] YDZQQRWRVYGNER-UHFFFAOYSA-N 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
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- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention provides a process of separating iron and titanium in seaside titanomagnetite via direct reduction roasting by using coal. According to the process, seaside titanomagnetite is employed as a raw material, a reducing agent, a binder, and an additive are added for briquetting, and then a selective direct reduction roasting - magnetic separation method is employed for respectively recovering iron and titanium. The process of the invention is simpler compared with other methods, wherein cost-effective coal is directly used as the reducing agent, additives added in the process is a mixture of sodium carbonate and sodium borate, and by adding the reducing agent and the additive, and controlling roasting temperature and time, selective reduction of iron and separation of iron and titanium can be achieved, ensuring the grade and recovery rate of direct reduced iron while reducing the titanium content in the direct reduced iron. The finally obtained direct reduction iron powder has a grade above 93%, the recovery rate of iron is generally greater than 85%, the titanium dioxide content is less than 0.5%, while the titanium dioxide content in obtained high titanium magnetic separation tailings is higher than 20%, and the recovery rate of titanium is greater than 90%.
Description
Technical field
The invention belongs to utilization of resources field, relate to a kind of processing method with iron and titanium in the titanomagnetite of the separated beach of direct-reduction roasting-magnetic separation.It is raw material containing menakanite ore deposit (hereinafter to be referred as beach titanomagnetite) that this technique be take the beach that main valuable mineral is titanomagnetite, take coal as reductive agent, by adding additive, beach titanomagnetite is carried out to selective reduction roasting-magnetic separation separation, iron is wherein entered in direct-reduction iron powder with the form of metallic iron, and titanium still enters into magnetic tailing with the form of oxide compound, obtain enrichment, thereby realize the separated of iron and titanium.
Technical background
China's iron ore deposit deposit wretched insufficiency, in identified 576.71 hundred million t iron ore reserves, economic base reserves are only 166.86 hundred million t.Whole nation iron ore deposit minable, that have economic worth only has more than 120 hundred million tons.The import volume of China's iron ore has accounted for 60% left and right of demand at present, and the price of iron ore is always by more international main iron ore company monopolizings, therefore in order to break up monopoly, domestic many companies are third world countries' exploitation iron ore deposit particularly abroad, and one of major objective that a large amount of beach titanomagnetites that exist of some of them country are exploitations at present.
Beach titanomagnetite is a kind of area by the sea effluent stream, wave, morning and evening tides and ocean current acting in conjunction and the downward enrichment sand iron ore that forms, and it mainly contains with mineral constituent is titanomagnetite, separately has a small amount of ilmenite and other gangue minerals.Beach titanomagnetite is in the Asian-Pacific area, as distributed more widely in Japan, Philippines, Indonesia, Australia, New Zealand.Its principal feature is that iron is of high grade, reserves large, is easy to mining, but because wherein titaniferous is high, is difficult to realize the recovery respectively of titanium and iron by general beneficiation method.The vanadium titanium beach placer that contains except New Zealand's northern coast obtaining containing after the iron ore concentrate of vanadium titanium by gravity treatment at present, adopt rotary kiln prereduction-electric furnace process that beach titanomagnetite is obtained outside utilization on a small scale, the utilization of not yet succeeding of other similar resource, therefore need to find new processing method.
As can be seen here, current situation and target for China's steel industry, study new technology and develop external unmanageable beach titanomagnetite resource, it is the task of top priority of China's sustainable development of iron and steel industry, also be to solve China's iron ore to depend on import unduly, ensure the only way which must be passed of iron ore raw material supply.The key technical problem that beach titanomagnetite exists in utilizing is at present the separation difficulty of iron and titanium, and direct-reduction roasting-magnetic separation process of the present invention is the effective way that solves titanium and iron separation difficulty.In the process of direct-reduction roasting, iron mineral in the titanomagnetite of beach is reduced to metallic iron and enters roasted ore, and titanium still exists with the form of oxide compound, by roasted ore being carried out to take metallic iron as main in the ore grinding magnetic product that then magnetic separation obtains, and titanium enrichment in non-magnetic product finally realizes the separated of titanium and iron and can utilize respectively.This technique can provide for the utilization of beach titanomagnetite new approach, also significant with the comprehensive effectively utilization that realizes resource to the situation of alleviation China iron ore resource anxiety.
Summary of the invention
The present invention is directed to the titanium difficult problem separated with iron existing in the titanomagnetite utilization of current beach, change the method for directly raw ore being processed in traditional ore-dressing technique, first by the roasting of selectivity direct-reduction, iron and titanium are present in roasted ore respectively with different states, then by beneficiation method, from roasted ore, reclaim respectively iron and titanium.Research shows that roasted ore process ore grinding and low intensity magnetic separation can directly obtain iron content and be greater than more than 93%, the direct-reduction iron product that iron recovery is greater than 85%, can obtain content of titanium dioxide more than 20% simultaneously, the high titanium magnetic tailing that titanium recovery rate is greater than 90%, thus reach the iron object separated with titanium.
Technical scheme of the present invention is:
by the technique of iron and titanium in the titanomagnetite of coal-based direct reduction baking separation beach,comprise the following steps:
First, the beach that is titanomagnetite by mineral is raw material containing menakanite ore deposit (hereinafter to be referred as beach titanomagnetite), according to material quantity, adds in proportion reductive agent, binding agent and additive, then mixes, and is pressed into ore deposit ball on ball press; The ore deposit ball being pressed into is in retort furnace, and at the roasting temperature 40～80min of 1200 ~ 1250 ℃, concrete roasting time is according to the different in kind of raw ore and different; Roasting product carries out fragmentation after naturally cooling, ore grinding in ball mill then, and during ore grinding, the mass concentration of ore pulp is 60% ~ 65%, ore milling product granularity accounts for 90% ~ 98% for-0.074mm; Ore milling product is under 90 ~ 130kA/m condition, to carry out low intensity magnetic separation to obtain direct-reduction iron product in magneticstrength, and titanium enters in magnetic tailing and obtains enrichment, for subsequent recovery titanium has been created condition; Wherein, described reductive agent is coal, and adding proportion is relative raw materials quality 20% ~ 30%, and concrete applicable coal need to be determined through overtesting; Described binding agent is wilkinite, and adding proportion is 8% ~ 12% of relatively former raw materials quality; Described additive is sodium carbonate and Sodium Tetraborate, and both mass ratioes are 4:1, and adding proportion is 8% ~ 15% of relatively former raw materials quality.
Utilize processing method of the present invention, can obtain iron grade and be greater than 93%, iron recovery is greater than 85%, the direct-reduction iron powder that content of titanium dioxide is less than 0.5%, make titanium enrichment in mine tailing simultaneously, obtain content of titanium dioxide and be greater than 20%, titanium recovery rate is higher than 90% high titanium magnetic tailing, thereby realized the effective separated of iron and titanium in beach placer.
The invention has the beneficial effects as follows: compared with the prior art, the present invention has following features:
because the titanium in the titanomagnetite of beach is to exist with isomorph form in magnetite, by existing beneficiation method, cannot realize the separated of iron and titanium, can only make iron and titanium Sync enrichment in iron ore concentrate, in the iron ore concentrate of gained, the grade of iron is no more than 60% and cannot further improve.But adopt this processing method not only can obtain the direct-reduced iron that iron grade is greater than 93%, make content of titanium dioxide in direct-reduction iron powder lower than 0.5%, can also make titanium obviously enrichment in magnetic tailing simultaneously, for condition has been created in the recovery of titanium;
this processing method is simple compared with additive method, and the direct-reduction iron powder obtaining can be directly used in steel-making, thereby has saved the process that iron fine powder blast furnace ironmaking is made steel again;
in this processing method, the separated of iron and titanium is the acting in conjunction that relies on reductive agent and additive, and the kind of reductive agent used and additive is simple, wide material sources, and pollutant discharge amount is also few compared with additive method, is easy to process; 4. to have avoided the coke that use cost is higher be reductive agent to this processing method, and the low coal dust of use cost is reductive agent, can save cost and the pollution to environment of process of coking; 5. adopt this processing method can realize higher economic worth, from economic benefit aspect, the direct-reduction iron powder obtaining after direct-reduction roasting-magnetic separation is more much higher than iron ore concentrate price, in mine tailing, the value of titanium is higher, this technique can realize and reclaim high-grade direct-reduced iron, can create conditions for the recovery of titanium again, therefore can realize higher economic benefit.
Accompanying drawing explanation
Fig. 1 is the process flow diagram of iron and titanium in the titanomagnetite of coal-based direct reduction baking separation of the present invention beach.
Embodiment
For describing better the present invention, below in conjunction with accompanying drawing, with embodiment, method provided by the invention is described in further detail.
embodiment 1
Certain beach titanomagnetite iron content 51.35%, containing titanium dioxide 11.13%.Adding 8% wilkinite is binding agent, and adds 30% coal and make reductive agent, and 8% additive is pressed into ore deposit ball on ball press after mixing.Selective reduction roasting condition is: ore deposit ball reducing roasting 40min at 1250 ℃ in retort furnace; Cooling under room temperature; At concentration 60% ore grinding, account for 90% to granularity-0.074mm, in magneticstrength 120kA/m magnetic separation.Obtain iron grade 93.21%, the direct-reduced iron of iron recovery 88.73%, wherein the content of titanium dioxide is 0.43%.In magnetic tailing, the content of titanium dioxide is 23.03%, and the rate of recovery of titanium is 98.04%.
embodiment 2
Certain beach titanomagnetite iron content 48.25%, containing titanium dioxide 7.45%.Adding 10% wilkinite is binding agent, adds 25% coal as reductive agent, and adds 9% additive, is pressed into ore deposit ball after mixing on ball press.Selective reduction roasting condition is: ore deposit ball reducing roasting 50min at 1200 ℃ in retort furnace; At room temperature cooling; Under mass concentration 62% condition, ore grinding accounts for 95% to granularity-0.074mm, carries out low intensity magnetic separation in magneticstrength under the condition that is 110kA/m.Obtain iron grade 93.12%, the direct-reduced iron of iron recovery 85.12%, wherein the content of titanium dioxide is 0.45%.In magnetic tailing, be 22.71% with the content of content of titanium dioxide, the rate of recovery of titanium is 97.35%.
embodiment 3
Certain beach titanomagnetite iron content 50.14%, containing titanium dioxide 10.33%.Adding 11% wilkinite is binding agent, and adds 20% coal and make reductive agent, and 12% additive is pressed into ore deposit ball on ball press after mixing.Selective reduction roasting condition is: ore deposit ball reducing roasting 80min at 1250 ℃ in retort furnace; Cooling under room temperature; Under the condition of ore pulp mass concentration 65%, ore grinding accounts for 98% to granularity-0.074mm, in magneticstrength 90kA/m magnetic separation.Obtain iron grade 93.21%, the direct-reduced iron of iron recovery 88.73%, wherein the content of titanium dioxide is 0.43%.In magnetic tailing, the content of titanium dioxide is 23.03%, and the rate of recovery of titanium is 98.04%.
Claims (2)
1. by the technique of iron in the titanomagnetite of coal-based direct reduction baking separation beach and titanium, it is characterized in that: first, the beach that the mineral of take are titanomagnetite is raw material containing menakanite ore deposit, according to beach, containing menakanite mineral amount, add in proportion reductive agent, binding agent and additive, then mix, on ball press, be pressed into ore deposit ball; The ore deposit ball being pressed into is in retort furnace, roasting temperature 40～80min at 1200 ℃～1250 ℃, roasting product carries out fragmentation after naturally cooling, then ore grinding in ball mill, the mass concentration of ore grinding is 60%～65%, ore milling product granularity accounts for 90%～98% for-0.074mm, and ore milling product is under 90～130kA/m condition, to carry out low intensity magnetic separation to obtain direct-reduction iron product in magneticstrength, and titanium enters in magnetic tailing and obtains enrichment;
Wherein, described reductive agent is coal, and adding proportion is that relative beach is containing 20%～30% of menakanite mineral amount;
Described binding agent is wilkinite, and adding proportion is that relative beach is containing 8%～12% of menakanite mineral amount;
Described additive is sodium carbonate and Sodium Tetraborate, and adding proportion is that relative beach is containing 8%～15% of menakanite mineral amount.
2. according to claim 1 by the technique of iron in the titanomagnetite of coal-based direct reduction baking separation beach and titanium, it is characterized in that: the mass ratio of described Sodium Carbonate Additive and Sodium Tetraborate is 4:1.
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| CN104894364A (en) * | 2015-05-18 | 2015-09-09 | 北京科技大学 | A method of producing magnesium titanate and direct-reduced iron by coal-based reduction and magnetic separation of titanomagnetite |
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