CN104152671A - Method for preparing iron ore concentrate for ironmaking from tin-containing iron ore - Google Patents
Method for preparing iron ore concentrate for ironmaking from tin-containing iron ore Download PDFInfo
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- CN104152671A CN104152671A CN201410347175.XA CN201410347175A CN104152671A CN 104152671 A CN104152671 A CN 104152671A CN 201410347175 A CN201410347175 A CN 201410347175A CN 104152671 A CN104152671 A CN 104152671A
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- iron ore
- tin
- reducing roasting
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- roasting
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 192
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 97
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 title claims abstract description 81
- 238000000034 method Methods 0.000 title claims abstract description 58
- 239000012141 concentrate Substances 0.000 title claims abstract description 29
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims abstract description 48
- 229910000029 sodium carbonate Inorganic materials 0.000 claims abstract description 24
- TVQLLNFANZSCGY-UHFFFAOYSA-N disodium;dioxido(oxo)tin Chemical compound [Na+].[Na+].[O-][Sn]([O-])=O TVQLLNFANZSCGY-UHFFFAOYSA-N 0.000 claims abstract description 17
- 229940079864 sodium stannate Drugs 0.000 claims abstract description 17
- 238000001914 filtration Methods 0.000 claims abstract description 12
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000002994 raw material Substances 0.000 claims abstract description 9
- 239000000203 mixture Substances 0.000 claims description 35
- 238000007885 magnetic separation Methods 0.000 claims description 27
- 229910002091 carbon monoxide Inorganic materials 0.000 claims description 24
- 238000005054 agglomeration Methods 0.000 claims description 18
- 230000002776 aggregation Effects 0.000 claims description 18
- 238000001816 cooling Methods 0.000 claims description 15
- 238000000498 ball milling Methods 0.000 claims description 8
- 239000011268 mixed slurry Substances 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 238000002386 leaching Methods 0.000 claims description 4
- 238000003801 milling Methods 0.000 claims description 4
- 238000011084 recovery Methods 0.000 abstract description 20
- 238000000926 separation method Methods 0.000 abstract description 16
- 230000007613 environmental effect Effects 0.000 abstract description 4
- 239000000654 additive Substances 0.000 abstract description 3
- 230000000996 additive effect Effects 0.000 abstract description 3
- 238000002156 mixing Methods 0.000 abstract description 3
- 238000001035 drying Methods 0.000 abstract 1
- 229910052718 tin Inorganic materials 0.000 description 72
- XOLBLPGZBRYERU-UHFFFAOYSA-N tin dioxide Chemical compound O=[Sn]=O XOLBLPGZBRYERU-UHFFFAOYSA-N 0.000 description 16
- 239000000243 solution Substances 0.000 description 14
- 230000000052 comparative effect Effects 0.000 description 10
- 238000000227 grinding Methods 0.000 description 10
- 238000004458 analytical method Methods 0.000 description 9
- 239000007789 gas Substances 0.000 description 9
- 238000012545 processing Methods 0.000 description 9
- 238000004364 calculation method Methods 0.000 description 8
- 229910006404 SnO 2 Inorganic materials 0.000 description 4
- 229910052500 inorganic mineral Inorganic materials 0.000 description 4
- NNIPDXPTJYIMKW-UHFFFAOYSA-N iron tin Chemical compound [Fe].[Sn] NNIPDXPTJYIMKW-UHFFFAOYSA-N 0.000 description 4
- 239000011707 mineral Substances 0.000 description 4
- 230000002829 reductive effect Effects 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000001354 calcination Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 238000005453 pelletization Methods 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- 238000005987 sulfurization reaction Methods 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- 235000007926 Craterellus fallax Nutrition 0.000 description 1
- 240000007175 Datura inoxia Species 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000012670 alkaline solution Substances 0.000 description 1
- 229910052785 arsenic Inorganic materials 0.000 description 1
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 238000005660 chlorination reaction Methods 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000009851 ferrous metallurgy Methods 0.000 description 1
- -1 ferrous metals Chemical class 0.000 description 1
- 239000003500 flue dust Substances 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 235000003599 food sweetener Nutrition 0.000 description 1
- 229910000041 hydrogen chloride Inorganic materials 0.000 description 1
- IXCSERBJSXMMFS-UHFFFAOYSA-N hydrogen chloride Substances Cl.Cl IXCSERBJSXMMFS-UHFFFAOYSA-N 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 159000000000 sodium salts Chemical class 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 239000003765 sweetening agent Substances 0.000 description 1
- 230000031068 symbiosis, encompassing mutualism through parasitism Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000000930 thermomechanical effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
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- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention discloses a method for preparing iron ore concentrate for ironmaking from tin-containing iron ore. The method comprises the following steps: mixing the tin-containing iron ore and a sodium carbonate additive according to a certain ratio, agglomerating, drying, and performing reducing roasting under proper temperature and reducing roasting atmosphere; and separating magnetite concentrate by combining an ore grinding-magnetic separating method, and filtering and separating sodium stannate solution and filter residues from remaining nonmagnetic matters. The method is simple in process flow, mild in process conditions, low in cost and environmental friendly, particularly effective separation between tin and iron in the tin-containing iron ore is realized, the iron recovery rate is high, the content of tin in the obtained iron ore concentrate is low, and the iron ore concentrate can serve as a raw material during blast furnace ironmaking.
Description
Technical field
The present invention relates to a kind of method of Iron Ore Containing Tin comprehensive utilization, a kind of particularly method of being prepared ironmaking iron ore concentrate by Iron Ore Containing Tin, belongs to mineral processing and ferrous metallurgy field.
Background technology
China's iron ore deposit reserves are abundant, along with the exhaustion day by day of high grade iron ore resources and rising steadily of imported iron ore price, need to strengthen the exploitation dynamics of complicated difficult processing iron ore deposit.Iron Ore Containing Tin is a kind of typical Complex Iron Ore, and reserves, compared with horn of plenty, are mainly distributed in the provinces and regions such as the Inner Mongol, Guangxi, Hunan, Yunnan, its general iron content 30%～55%, stanniferous 0.13%～0.5%.Because tin too high levels will have a strong impact on smooth operation of furnace and operating duty.Therefore, for the large-scale application of this kind of resource, the tin (Sn content is lower than 0.08%) in necessary first effective elimination iron ore.It is reported, in Iron Ore Containing Tin, tin mainly exists with the form of cassiterite, and is tiny monomer cassiterite particle or with in fine grain teeth cloth and ferriferous oxide more, and conventional physical concentration means are difficult to realize high efficiency separation and the recovery of tin, iron.Develop iron and tin in this mineral intergrowth that is difficult to utilize of effective Separation and Recovery, tool is of great significance.
At present, be thermal process for the utilization comparison effective means of stanniferous iron composite factor both at home and abroad, common method has:
1) sulfiding volatilization method.Sulfiding volatilization method is to process in the world medium tin ore, lean tin concentrate or the comparatively effective means of tin metallurgy slag that iron level is higher at present, can realize preferably Sn, Fe and separate.Its principle utilizes SnS to reclaim tin in the qualitative feature of volatilization, and such as adopting fuming furnace sulfiding volatilization method to process medium tin ore, Sn evaporation rate is all more than 98%, and waste contains Sn below 0.07%.But the main drawback of this method is: curing temperature is high, need the high temperature of 1180 DEG C～1300 DEG C; Roasting time is longer, needs 60～90min; And in flue gas, contain SO
2gas, need process and could discharge through desulfurization, otherwise can cause secondary pollution.
2) chlorinating roasting.The method is by the mixing of materials containing Sn, Fe, Zn etc., add chlorizating agent solution, send into rotary kiln through grinding, balling-up, after dry together with carbonaceous reducing agent, then roasting under 1000 DEG C of left and right high temperature, Sn in pelletizing and other nearly all non-ferrous metals volatilize with muriatic form, in dust collecting system, are reclaimed.If chlorination volatilization develops into the lean tin material of processing the low-grade high impurity (especially arsenic, iron) that cannot process of general tin smelting system, is the efficient processing means that comprehensively reclaim multi-metal complex mineral.But because chlorine and hydrogenchloride have very strong chemically reactive, large to industrial equipments corrodibility, and environment is worked the mischief, thereby greatly limited the widespread use of this method.
3) weak reducing roasting volatilization method.Patent " a kind of from ore dressing containing the method for Separation and Recovery tin tailing (patent No.: 201210453731.2) " adopt the method for weak reducing roasting to process the reluctant stanniferous milltailings of traditional ore-dressing technique, make to reach more than 70% containing the evaporation rate of tin in tailing, can realize low-grade high efficiency separation and recovery containing tin element in tailing.Its know-why is: under hot conditions, utilize SnO
2more easily be reduced to SnO, and the vapour pressure of SnO is large, thereby realizes volatilization and the recovery of SnO.But present method is not considered separation and the recovery of ferro element in mine tailing.According to thermomechanical analysis, the volumetric concentration of CO [CO/ (CO+CO in present method calcination atmosphere
2)] be 20%～50%, under this reducing atmosphere condition, high price ferriferous oxide is easily reduced to Fu Shi body, is unfavorable for recovery and the utilization of follow-up ferro element.
Current published patent is mostly the principle based on sulfuration or chloridizing roasting, add different sweetening agent, chlorizating agent, or the mixing of the two, have reductive agent exist and higher than the condition of 1000 DEG C under vulcanize, chloridizing volatilization, then in flue dust, reclaim tin.But the outstanding problem that sulfiding volatilization and chlorinating roasting exist is that energy consumption is high, contaminate environment and equipment requirements high.Therefore, at current China high-quality iron ore deposit day by day under exhausted present situation, be badly in need of the method for utilizing Iron Ore Containing Tin of a kind of efficient, environmental protection of exploitation, economical rationality.
Summary of the invention
The defect existing while processing Iron Ore Containing Tin for prior art, the object of the invention is to be to provide a kind of method that technical process is simple, processing condition are gentle, cost is low, eco-friendly Iron Ore Containing Tin is prepared ironmaking iron ore concentrate, the method tin iron good separating effect, iron recovery is high, the iron ore concentrate tin content obtaining is low, can be used as the raw material of blast furnace ironmaking.
The invention discloses a kind of method of being prepared ironmaking iron ore concentrate by Iron Ore Containing Tin, the method comprises the following steps:
Step (1): raw material agglomeration
By Iron Ore Containing Tin and sodium carbonate, respectively by after milling, 1:0.1～0.4 mixes in mass ratio, then by mixture agglomeration;
Step (2): reducing roasting
After predrying step (1) gained agglomerate, be placed in reducing atmosphere, at 850 DEG C～945 DEG C temperature, carry out reducing roasting, after reducing roasting completes, by cooling reducing roasting product; Described reducing atmosphere is by CO and CO
2mix composition, the volume percent fractal dimension of CO is held in 5%≤[CO/ (CO+CO
2)] × 100%≤17%;
Step (3): ball milling leaches, magnetic separation separates
Cooled step (2) reducing roasting product is placed in to water ball milling, leaching, obtains mixed slurry; Gained mixed slurry is isolated magnetite concentrate by magnetic separation, and remaining nonmagnetics is by filtering to isolate sodium stannate solution and filter residue.
Of the present inventionly prepare ironmaking by Iron Ore Containing Tin and also comprise following preferred version by the method for iron ore concentrate:
In preferred scheme, Iron Ore Containing Tin and sodium carbonate mix 1:0.2～0.3 in mass ratio.
In preferred scheme, reducing roasting temperature is 875 DEG C～925 DEG C.
In preferred scheme, the reducing roasting time is 30min～60min; Most preferably be 45min～55min.
In preferred scheme, in reducing atmosphere, the volume percent fractal dimension of CO is held in 10%≤[CO/ (CO+CO
2)] × 100%≤15%.
In preferred scheme, Iron Ore Containing Tin and sodium carbonate are by granularity after milling≤-0.1mm, and the shared quality percentage composition of-0.1mm grade is 100%.
Described agglomeration method comprises pelletizing or the group of pressure.
Described cooling can be in inert atmosphere cooling or adopt water cooling.
Most preferred method, comprises the following steps:
Step (1): raw material agglomeration
After the shared quality percentage composition of be milled to respectively-0.1mm of Iron Ore Containing Tin and sodium carbonate grade is 100%, 1:0.2～0.3 mixes in mass ratio, then by mixture agglomeration;
Step (2): reducing roasting
After predrying step (1) gained agglomerate, be placed in reducing atmosphere, at 875 DEG C～925 DEG C temperature, carry out after reducing roasting 45min～55min, by cooling reducing roasting product; Described reducing atmosphere is by CO and CO
2mix composition, the volume percent fractal dimension of CO is held in 10%≤[CO/ (CO+CO
2)] × 100%≤15%;
Step (3): ball milling leaches, magnetic separation separates
Cooled step (2) reducing roasting product is placed in to water ball milling, leaching, obtains mixed slurry; Gained mixed slurry is isolated magnetite concentrate by magnetic separation, and remaining nonmagnetics is by filtering to isolate sodium stannate solution and filter residue.
Novelty of the present invention is: quantity research shows greatly, and in Iron Ore Containing Tin, tin is mainly with cassiterite mineral (SnO
2) exist, iron mainly exists with the form of high price ferriferous oxide; SnO at normal temperatures
2be insoluble in acid, alkaline solution; And at high temperature, the decomposition pressure of tindioxide is very little, it is stable compound.Contriver has carried out after a large amount of experimental studies the roasting of Iron Ore Containing Tin, finds SnO
2roasting under weak reducing atmosphere easily generates sodium stannate with sodium carbonate, as SnO
2+ Na
2cO
3=Na
2snO
3+ CO
2, and ferriferous oxide does not react substantially with sodium salt, utilizes sodium stannate character soluble in water, can make tin in Iron Ore Containing Tin be converted into sodium stannate and enter solution, and then reclaim tin from solution.Meanwhile, contriver surprisingly finds that sodium carbonate can significantly destroy the stable lattice of ferriferous oxide, is conducive to dissociating of cassiterite and ferriferous oxide, and accelerates reacting of cassiterite and sodium carbonate, thereby reaches the object of Iron Ore Containing Tin detin.Contriver carries out lot of experiments roasting condition is continued to optimize to discovery, 850 DEG C～945 DEG C of maturing temperatures, and weak reducing roasting atmosphere [CO/ (CO+CO
2)] in the system of × 100%=5%～17%, particularly 875 DEG C～925 DEG C of roasting maturing temperatures, weak reducing roasting atmosphere [CO/ (CO+CO
2)] in the system of × 100%=10%～15%, high price ferriferous oxide is easily reduced to magnetite 3Fe
2o
3+ CO=2Fe
3o
4+ CO
2, be conducive to the generation of sodium stannate simultaneously; The product that reducing roasting generates soaks through grinding, magnetic separation separates and obtains high-grade magnetite concentrate, and nonmagnetics filters to obtain sodium stannate solution.
Compared with the technique of existing processing Iron Ore Containing Tin, clear superiority of the present invention is:
1) iron tin separating effect is remarkable, and iron recovery is high.Sodium carbonate can react generation sodium stannate with the cassiterite in iron ore, the separating effect of strengthening tin and iron, and in the final magnetite concentrate obtaining, the content of tin, lower than 0.08%, meets the requirement of blast furnace ironmaking raw material; Adopt the present invention, iron recovery is greater than 83%.
2) maturing temperature is low.The method of existing processing Iron Ore Containing Tin comprises sulfuration and chloride volatility process, and maturing temperature is all more than 1000 DEG C, and maturing temperature of the present invention just can be realized at 850 DEG C～945 DEG C, most preferably at 875 DEG C～925 DEG C.
3) technical process is simple, and cost is low.The present invention be with after Iron Ore Containing Tin and sodium carbonate agglomeration through magnetizing roasting, adopt that conventional mill soaks, magnetic separation separates effective separation that can realize iron tin, obtains the higher-grade magnetite concentrate of ironmaking use, technical process of the present invention and equipment are simple.The additive adopting is sodium carbonate, its wide material sources, low price.
4) operational safety, environmental friendliness.The processes such as magnetizing roasting process of the present invention and follow-up mill soak, magnetic separation, filtration, can not produce environmental pollution.
In sum, technical process of the present invention is simple, cost is low, easy and simple to handle, energy consumption is low, environmental friendliness, and the tin that particularly can realize in Iron Ore Containing Tin separates with iron, and iron recovery is high, and the stanniferous amount of iron ore concentrate making is low, can be used as the raw material of blast furnace ironmaking.The present invention is applicable to process the milltailings resource of various Iron Ore Containing Tins and stanniferous iron, is specially adapted to process the tin iron symbiotic ore that adopts beneficiation method to be difficult to separation, ferriferous oxide and the tight symbiosis of cassiterite.
Brief description of the drawings
[Fig. 1] is process flow sheet of the present invention.
Embodiment
Following examples are intended to further illustrate content of the present invention, instead of limit the scope of the invention.
TFe content 42.3% in the embodiment of the present invention and comparative example Iron Ore Containing Tin used, Sn content is 0.8%.Before test, first by Iron Ore Containing Tin and sodium carbonate respectively levigate to-the shared quality percentage composition of 0.1mm grade is 100%.Illustrate: the present invention is suitable for the Iron Ore Containing Tin of processing and includes but are not limited to embodiment and comparative example raw material used.
Comparative example 1
In this comparative example, do not add sodium carbonate additive
By the Iron Ore Containing Tin agglomeration after fine grinding, dry, more dry agglomerate is inserted by CO and CO
2in the reducing atmosphere of mixed gas composition, add thermal bake-out, wherein [CO/ (CO+CO
2)] × 100%=15%, maturing temperature is 875 DEG C, the time is 55min; After roasting agglomerate is cooling, soak through mill successively, carry out magnetic separation separation with the magneticstrength of 1000Gs, TFe content 60.2% in gained magnetic separation of iron ore concentrate, tin content is 0.42%, the rate of recovery of iron is 78.4%.By analysis and calculation, in the solution after nonmagnetics filters, the content of Sn is 0.
Comparative example 2
In this comparative example, maturing temperature is higher
By the Iron Ore Containing Tin after fine grinding and sodium carbonate 1:0.2 batching in mass ratio; Mix rear agglomeration, dry, more dry agglomerate is inserted by CO and CO
2in the reducing atmosphere of mixed gas composition, add thermal bake-out, wherein [CO/ (CO+CO
2)] × 100%=15%, maturing temperature is 1000 DEG C, the time is 45min; After roasting agglomerate is cooling, soak through mill successively, carry out magnetic separation separation with the magneticstrength of 1000Gs, TFe content 55.2% in gained magnetic separation of iron ore concentrate, tin content is 0.38%, the rate of recovery of iron is 60.2%.By analysis and calculation, in raw ore, 81.6% tin enters containing in sodium stannate solution after nonmagnetics filtration.
Comparative example 3
In this comparative example, maturing temperature is lower
By the Iron Ore Containing Tin after fine grinding and sodium carbonate 1:0.2 batching in mass ratio; Mix rear agglomeration, dry, more dry agglomerate is inserted by CO and CO
2in the reducing atmosphere of mixed gas composition, add thermal bake-out, wherein [CO/ (CO+CO
2)] × 100%=15%, maturing temperature is 800 DEG C, the time is 60min; After roasting agglomerate is cooling, soak through mill successively, carry out magnetic separation separation with the magneticstrength of 1000Gs, TFe content 61.5% in gained magnetic separation of iron ore concentrate, tin content is 0.71%, the rate of recovery of iron is 80.4%.By analysis and calculation, in the solution after nonmagnetics filters, the content of Sn is 0.
Comparative example 4
CO/ (CO+CO in calcination atmosphere in this comparative example
2) higher
By the Iron Ore Containing Tin after fine grinding and sodium carbonate 1:0.3 batching in mass ratio; Mix rear agglomeration, dry, more dry agglomerate is inserted by CO and CO
2in the reducing atmosphere of mixed gas composition, add thermal bake-out, wherein [CO/ (CO+CO
2)] × 100%=30%, maturing temperature is 875 DEG C, the time is 50min; After roasting agglomerate is cooling, soak through mill successively, carry out magnetic separation separation with the magneticstrength of 1000Gs, TFe content 58.2% in gained magnetic separation of iron ore concentrate, tin content is 0.72%, the rate of recovery of iron is 58.4%.By analysis and calculation, in raw ore, 10% tin enters containing in sodium stannate solution after nonmagnetics filtration.
Embodiment 1
By the Iron Ore Containing Tin after fine grinding and sodium carbonate 1:0.1 batching in mass ratio; Mix rear agglomeration, dry, more dry agglomerate is inserted by CO and CO
2in the reducing atmosphere of mixed gas composition, add thermal bake-out, wherein [CO/ (CO+CO
2)] × 100%=17%, maturing temperature is 850 DEG C, the time is 60min; After roasting agglomerate is cooling, mill soaks, and carries out magnetic separation separation with the magneticstrength of 1000Gs, and in gained magnetic separation of iron ore concentrate, TFe content is 62.1%, and tin content is 0.08%, and the rate of recovery of iron is 83.2%.By analysis and calculation, in raw ore, 80.6% tin enters containing in sodium stannate solution after nonmagnetics filtration.
Embodiment 2
By the Iron Ore Containing Tin after fine grinding and sodium carbonate 1:0.4 batching in mass ratio; Mix rear agglomeration, dry, more dry agglomerate is inserted by CO and CO
2in the reducing atmosphere of mixed gas composition, add thermal bake-out, wherein [CO/ (CO+CO
2)] × 100%=5%, maturing temperature is 945 DEG C, the time is 30min; After roasting agglomerate is cooling, mill soaks, and carries out magnetic separation separation with the magneticstrength of 1000Gs, TFe content 62.8% in gained magnetic separation of iron ore concentrate, and tin content is 0.07%, the rate of recovery of iron is 84.4%.By analysis and calculation, in raw ore, 81.5% tin enters containing in sodium stannate solution after nonmagnetics filtration.
Embodiment 3
By the Iron Ore Containing Tin after fine grinding and sodium carbonate 1:0.3 batching in mass ratio; Mix rear agglomeration, dry, more dry agglomerate is inserted by CO and CO
2in the reducing atmosphere of mixed gas composition, add thermal bake-out, wherein [CO/ (CO+CO
2)] × 100%=15%, maturing temperature is 875 DEG C, the time is 55min; After roasting agglomerate is cooling, mill soaks, and carries out magnetic separation separation with the magneticstrength of 1000Gs, TFe content 63.5% in gained magnetic separation of iron ore concentrate, and tin content is 0.05%, the rate of recovery of iron is 86.1%.By analysis and calculation, in raw ore, 85.6% tin enters containing in sodium stannate solution after nonmagnetics filtration.
Embodiment 4
By the Iron Ore Containing Tin after fine grinding and sodium carbonate in mass ratio 1:0.2 mix; Mix rear agglomeration, dry, more dry agglomerate is inserted by CO and CO
2in the reducing atmosphere of mixed gas composition, add thermal bake-out, wherein [CO/ (CO+CO
2)] × 100%=10%, maturing temperature is 925 DEG C, the time is 45min; After roasting agglomerate is cooling, soak through mill successively, carry out magnetic separation separation with the magneticstrength of 1000Gs, TFe content 64.1% in gained magnetic separation of iron ore concentrate, tin content is 0.06%, the rate of recovery of iron is 87.2%.By analysis and calculation, in raw ore, 84.7% tin enters containing in sodium stannate solution after nonmagnetics filtration.
Claims (8)
1. a method of being prepared ironmaking iron ore concentrate by Iron Ore Containing Tin, is characterized in that, comprises the following steps:
Step (1): raw material agglomeration
By Iron Ore Containing Tin and sodium carbonate, respectively by after milling, 1:0.1～0.4 mixes in mass ratio, then by mixture agglomeration;
Step (2): reducing roasting
After predrying step (1) gained agglomerate, be placed in reducing atmosphere, at 850 DEG C～945 DEG C temperature, carry out reducing roasting, after reducing roasting completes, by cooling reducing roasting product; Described reducing atmosphere is by CO and CO
2mix composition, the volume percent fractal dimension of CO is held in 5%≤[CO/ (CO+CO
2)] × 100%≤17%;
Step (3): ball milling leaches, magnetic separation separates
Cooled step (2) reducing roasting product is placed in to water ball milling, leaching, obtains mixed slurry; Gained mixed slurry is isolated magnetite concentrate by magnetic separation, and remaining nonmagnetics is by filtering to isolate sodium stannate solution and filter residue.
2. according to the described method of claim 1, it is characterized in that, Iron Ore Containing Tin and sodium carbonate in mass ratio 1:0.2～0.3 mix.
3. according to the described method of claim 1, it is characterized in that, reducing roasting temperature is 875 DEG C～925 DEG C.
4. according to the described method of claim 3, it is characterized in that, the reducing roasting time is 30min～60min.
5. according to the described method of claim 4, it is characterized in that, the reducing roasting time is 45min～55min.
6. according to the described method of claim 1, it is characterized in that, in described reducing atmosphere, the volume percent fractal dimension of CO is held in 10%≤[CO/ (CO+CO
2)] × 100%≤15%.
7. according to the described method of claim 1, it is characterized in that, described Iron Ore Containing Tin and sodium carbonate is by after milling, its-the shared quality percentage composition of 0.1mm grade is 100%.
8. according to the method described in claim 1～7 any one, it is characterized in that, comprise the following steps:
Step (1): raw material agglomeration
After the shared quality percentage composition of be milled to respectively-0.1mm of Iron Ore Containing Tin and sodium carbonate grade is 100%, 1:0.2～0.3 mixes in mass ratio, then by mixture agglomeration;
Step (2): reducing roasting
After predrying step (1) gained agglomerate, be placed in reducing atmosphere, at 875 DEG C～925 DEG C temperature, carry out after reducing roasting 45min～55min, by cooling reducing roasting product; Described reducing atmosphere is by CO and CO
2mix composition, the volume percent fractal dimension of CO is held in 10%≤[CO/ (CO+CO
2)] × 100%≤15%;
Step (3): ball milling leaches, magnetic separation separates
Cooled step (2) reducing roasting product is placed in to water ball milling, leaching, obtains mixed slurry; Gained mixed slurry is isolated magnetite concentrate by magnetic separation, and remaining nonmagnetics is by filtering to isolate sodium stannate solution and filter residue.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| CN201410347175.XA CN104152671B (en) | 2014-07-21 | 2014-07-21 | A kind of method of being prepared ironmaking iron ore concentrate by Iron Ore Containing Tin |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105603178A (en) * | 2016-03-14 | 2016-05-25 | 中南大学 | Method for preparing tin-iron coarse alloy powder from tin containing iron ore |
| CN106222401A (en) * | 2016-09-21 | 2016-12-14 | 内蒙古包钢钢联股份有限公司 | The preparation method of pellet |
| CN109628746A (en) * | 2019-01-03 | 2019-04-16 | 江西铜业技术研究院有限公司 | The extracting method of tin in a kind of silver separating residues |
| CN110065965A (en) * | 2019-04-25 | 2019-07-30 | 中南大学 | A kind of compound additive and method preparing sodium stannate for strengthening cassiterite concentrate soda roasting |
| CN113528734A (en) * | 2020-04-13 | 2021-10-22 | 舒新前 | Method for recovering iron ore concentrate by roasting and reducing iron-containing waste |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102925718A (en) * | 2012-10-25 | 2013-02-13 | 中南大学 | Composite sodium salt for producing sodium stannate from cassiterite concentrate and application of composite sodium salt |
| CN102965522A (en) * | 2012-11-13 | 2013-03-13 | 中南大学 | Method for separating and recovering tin from tin-containing mill tailings |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102925718A (en) * | 2012-10-25 | 2013-02-13 | 中南大学 | Composite sodium salt for producing sodium stannate from cassiterite concentrate and application of composite sodium salt |
| CN102965522A (en) * | 2012-11-13 | 2013-03-13 | 中南大学 | Method for separating and recovering tin from tin-containing mill tailings |
Non-Patent Citations (1)
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| 李光辉等: "含锡铁精矿CO还原分离锡铁的行为研究", 《矿冶工程》, vol. 32, no. 4, 30 August 2012 (2012-08-30), pages 83 - 86 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105603178A (en) * | 2016-03-14 | 2016-05-25 | 中南大学 | Method for preparing tin-iron coarse alloy powder from tin containing iron ore |
| CN105603178B (en) * | 2016-03-14 | 2018-05-01 | 中南大学 | A kind of method that the thick alloyed powder of tin iron is prepared by Iron Ore Containing Tin |
| CN106222401A (en) * | 2016-09-21 | 2016-12-14 | 内蒙古包钢钢联股份有限公司 | The preparation method of pellet |
| CN109628746A (en) * | 2019-01-03 | 2019-04-16 | 江西铜业技术研究院有限公司 | The extracting method of tin in a kind of silver separating residues |
| CN110065965A (en) * | 2019-04-25 | 2019-07-30 | 中南大学 | A kind of compound additive and method preparing sodium stannate for strengthening cassiterite concentrate soda roasting |
| CN113528734A (en) * | 2020-04-13 | 2021-10-22 | 舒新前 | Method for recovering iron ore concentrate by roasting and reducing iron-containing waste |
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| CN104152671B (en) | 2016-05-25 |
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