CN105603178A - Method for preparing tin-iron coarse alloy powder from tin containing iron ore - Google Patents
Method for preparing tin-iron coarse alloy powder from tin containing iron ore Download PDFInfo
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- CN105603178A CN105603178A CN201610143174.2A CN201610143174A CN105603178A CN 105603178 A CN105603178 A CN 105603178A CN 201610143174 A CN201610143174 A CN 201610143174A CN 105603178 A CN105603178 A CN 105603178A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/02—Roasting processes
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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Abstract
The invention discloses a method for preparing tin-iron coarse alloy powder from tin containing iron ore. The method includes the steps that after being broken and ground, the tin containing iron ore is mixed with a composite additive formed by calcium carbonate, sodium carbonate, sodium sulfate, borax and sodium humate for agglomeration; obtained agglomerates are dried and then subjected to high-temperature reducing roasting; the products obtained after reducing roasting are sequentially cooled, broken and ground, and then are subjected to magnetic separating, and the coarse alloy powder is obtained. The method has the advantages that the requirement on the raw materials is low, the tin-iron comprehensive recovery rate is high, the flow is simple, energy consumption is low, and environment friendliness is achieved, and the prepared coarse tin-iron alloy powder can directly serve as raw materials for smelting tin containing easy-to-cut steel and tin containing alloy cast iron.
Description
Technical field
The present invention relates to a kind of method of being prepared the thick alloyed powder of tin iron by Iron Ore Containing Tin, belong to Ferrous Metallurgy field.
Background technology
Automatic steel be by add the appropriate chemical element that can improve machinability (as sulphur, phosphorus, lead, calcium,Selenium, tellurium etc.), in steel, form favourable non-metallic inclusion, adding of also having can be dissolved in solid solution (as ironElement body) to improve the steel alloy of its machinability. This type of steel can be dark by higher cutting speed and larger cuttingDegree carries out machining. Its major advantage is that the resistance to cutting of steel is reduced, and easily cuts the spy of element itself simultaneouslyProperty and the compound that forms play lubricated cutting tool, easily chip breaking, has alleviated wearing and tearing, thereby has reducedThe surface roughness of workpiece, has improved cutter life and production efficiency. Automatic steel be mainly used in auto industry,Precision instrument industry and household electrical appliance industry. At present, the utilization of plumbous system and resulfurizing series free cutting steel product is the most extensive,But plumbous smelting and leaded steel scrap reclaim in fusion process and pollute the environment, and its application is restricted, someAmerican-European countries has stopped reclaiming leaded auto parts and components. Tin and lead are all IVA family element, physico-chemical property phaseSeemingly, and tin and selenium, tellurium to compare price relative low, inside and outside crossing in recent years, started the research work of tin-containing free cutting steelDo. It is generally acknowledged in tin-containing free cutting steel, control tin element content and be no more than 0.05%, can reach goodEasy cutting index, do not affect the mechanical strength of steel simultaneously. In Cast Iron Production technique, there is large quantity research tableBright, when tin content is during at 0.1-0.2%, tin element has obvious effect to the corrosion resistance that improves cast iron, mainly formerBecause being the formation that tin promotes cast iron medium pearlite, improve the pearlitic spread, meanwhile, the tin element of trace hasHelp improve tensile strength and the Brinell hardness of cast iron. Produce at present the master of tin-containing free cutting steel and tin-containing ironWanting method is in molten iron, to add quantitative tin, and the tin adding in molten iron must be that highly purified refined tin is (pureDegree is more than 99.9%).
A kind of typical difficult iron ore deposit of Iron Ore Containing Tin stone China, gross reserves exceedes 500,000,000 tons, existing choosingMiner's process (comprising magnetic separation, gravity treatment, flotation etc.) is difficult to realize the recovery that separates of tin and iron, be mainly because ofFor tin mineral (being mainly cassiterite) and iron mineral (magnetic iron ore, bloodstone etc.) disseminated grain size are thin and symbiosis, companionThe raw complexity that is related to. Cassiterite is crisp simultaneously, repeatedly in mill-ore-dressing practice process, pulverizing, argillization occurring, entersOne step has reduced the recovery of tin, and the overall recovery of ore-dressing practice tin is generally lower than 30% at present. Due to iron with respect toThe economic worth of tin is lower, in cassiterite ore dressing process, generally using the iron ore of red, limonite type as impurityElement is not considered to reclaim; And the Iron Ore Containing Tin of magnetic iron ore type is only adopted to magnetic separation recovery section iron, this type of iron oreIn tin content generally between 0.1-0.5%, be difficult to reach blast furnace process requirement (Sn content lower than0.08％)。
The group of the Iron Ore Containing Tin of thermal process processing at present wants method to comprise sulfiding volatilization, chloridizing volatilization and reduction volatilizationMethod. Its primary raw material is all to utilize SnS, SnCl2, SnO vaporization at high temperature characteristic, by stanniferous material and sulphurAfter agent, chlorinating agent and reducing agent mix, carry out high-temperature roasting, fuming volatility process can well realize tin ironThe separation of element, but the SO of sulfuration, chlorination process generation2，HCl，Cl2On pernicious gas severe contamination ringBorder, etching apparatus, high-temperature roasting energy consumption is high, and production cost is high.
In sum, the technique of existing comprehensive utilization Iron Ore Containing Tin resource exists that the rate of recovery is low, cost is high, pollutesThe problem such as serious, is badly in need of the method for a kind of high-efficiency environment friendly comprehensive utilization of exploitation Iron Ore Containing Tin resource.
Summary of the invention
The defect treatment process of Iron Ore Containing Tin resource being existed for prior art, for realizing Iron Ore Containing Tin resourceEfficient, environmental protection develop, the object of the invention is to be to provide one to make full use of tin iron in Iron Ore Containing TinMineral embedding cloth closely, the characteristic of separation difficulty, taking Iron Ore Containing Tin as raw material, directly prepare the thick alloyed powder of tin ironMethod, the method can obtain the thick alloy of tin iron as the raw material of smelting tin-containing free cutting steel and tin-containing ironPowder, the synchronous high-efficiency of fully having realized tin and iron valuable element reclaims.
In order to realize above-mentioned technical purpose, the invention provides and a kind ofly prepare tin iron thick alloyed powder by Iron Ore Containing TinMethod, the method be by Iron Ore Containing Tin fragmentation, levigate after, with compound additive mixing agglomeration; Gained agglomerate warpAfter dry, at 900～1050 DEG C of temperature, carry out reduction roasting; Reduction roasting product is successively through supercooling, brokenAfter broken and levigate, magnetic separation separates, and obtains thick tin iron alloy powder; Described compound additive is by calcium carbonate, carbonic acidSodium, sodium sulphate, borax and sodium humate be 5～10:8～12:3～5:1～2:1～2 composition in mass ratio.
In prior art, because the embedding cloth of tin-iron mine thing in Iron Ore Containing Tin own is tight, separation difficulty, conventional choosingOre deposit-smelting process is difficult to synchronous high-efficiency and recycles tin and iron, and tin and iron recovery are low, and loss late is large. ThisBright technical scheme makes full use of tin and the synchronous reduction act of iron mineral in reduction process, and metallic tin andBetween metallic iron, there is the character of stronger affinity, in Iron Ore Containing Tin roasting process, added a kind of special compoundAdditive, this compound additive can promote the synchronous reduction of tin and ferriferous oxide on the one hand, and crystal grain is assembled,Grow up, form thick tin ferroalloy, can suppress on the other hand the tin that in reduction process, tin formation SnO causes and waveSend out loss. The tin ferroalloy forming can utilize the ferromagnetism feature of metallic iron, by ore grinding-magnetic separation and gangueMineral separate, and finally obtain the tin ferroalloy that impurity is few, can be directly as electric furnace smelting tin-containing free cutting steel,The quality raw materials of Sn-containing alloy cast iron.
Preferred scheme, the quality of calcium carbonate, sodium carbonate, sodium sulphate, borax and sodium humate is respectively stanniferous5～10%, 8～12%, 3～5%, 1～2% and 1～2% of iron ore quality.
Preferred scheme, it is 500～1500Gs that magnetic separation separates the magnetic field intensity adopting.
Preferred scheme, reduction roasting adopts coal and/or natural gas as reducing agent. The consumption of reducing agent is generalIt is excessive in to ensure that reduction process is as strong reducing property atmosphere to require.
Preferred scheme, the reduction roasting time is 60～120min.
Preferred scheme, described Iron Ore Containing Tin is after broken and levigate, and granularity is satisfied-0.074mm grade matterAmount degree accounts for more than 80%.
Preferred scheme, Iron Ore Containing Tin is at least one in tin-iron mine raw ore, tin iron tailings, high ferro tin metallurgical slag.
Preferred scheme, described reduction roasting product is after broken and levigate, and granularity is satisfied-0.074mm grainLevel mass percentage content accounts for more than 80%.
Prior art relatively, the useful technique effect that technical scheme of the present invention is brought:
1) technical scheme of the present invention is not subject to the limitation of Iron Ore Containing Tin raw material, can be from tin-iron mine raw ore, tin ironThe low-grade Iron Ore Containing Tin raw materials such as ore deposit milltailings, high ferro tin metallurgical slag are directly prepared and are met tin-containing free cutting steelThe thick alloy of high-grade tin iron with the ingredient requirement of tin-containing iron. And in these low-grade Iron Ore Containing Tin raw materials, tinIron mineral embedding cloth is tight, and separation difficulty adopts traditional ore dressing-smelting process to be difficult to synchronous high-efficiency and recyclesTin and iron, and tin and iron recovery low, loss late is large.
2) technical scheme of the present invention has adopted a kind of special compound additive, and compound additive is at stanniferous ironIn the raw material reducing roasting process of ore deposit, can promote on the one hand the synchronous reduction of tin and ferriferous oxide, and promote crystal grainAssemble, grow up, generate tin ferroalloy, compound additive can suppress to form in reduction process SnO on the other handThe tin volatilization loss causing, in addition, compound additive can reduce reduction roasting temperature, and reduction system is solid-stateReduction, system does not have slag to form mutually, can not cause tin iron loss, and simultaneously low for equipment requirements, energy consumption is low. HaveThe comprehensive high-efficiency that is beneficial to tin and iron reclaims (up to more than 90%). And generally can produce in traditional ore dressing-smelting processRaw middle mine tailing, metallurgical slag etc., inevitably cause the loss of tin and iron; With tin ore dressing and smelting processFor example, the tin rate of recovery of general beneficiation flowsheet is not higher than 30%, and the rate of recovery that tin is smelted is generally on 80% left sideThe right side, in main-process stream, the tin rate of recovery is only 25% left and right.
3) technical scheme of the present patent application makes the synchronous reduction of tin and ferriferous oxide by reduction roasting, formsAfter tin ferroalloy, then separate by magnetic separation, tin iron recovery is high, and impurity is few.
4) technical scheme of the present invention is simple to operate, cost is low, environmentally friendly, is conducive to suitability for industrialized production.
Detailed description of the invention
Following examples are intended to further illustrate content of the present invention, instead of the protection of restriction the claims in the present inventionScope.
Below a kind of technique of preparing the thick alloyed powder of tin iron by Iron Ore Containing Tin of the present invention is illustrated.
Embodiment 1:
TFe grade 32.11%, the Iron Ore Containing Tin of Sn content 0.18%, through broken, ore grinding to-0.074mmAccount for 80%; Add respectively additive carbon according to 10%, 10%, 3%, 1%, 2% of Iron Ore Containing Tin mass fractionAcid calcium, sodium carbonate, sodium sulphate, borax, sodium humate, after mixing in disc balling machine pelletizing; Dry pelletizingJoin excessive brown coal outward as reducing agent, 1050 DEG C of reduction temperatures, recovery time 60min; Reduction roasting productCooling rear ore grinding accounts for 85%, carries out magnetic separation in the magnetic separation strength of 1000Gs to-0.074mm. Obtaining tin iron slightly closesIron grade 90.11% in bronze, iron recovery 92.19%; Tin grade 0.52%, the tin rate of recovery 92.10%.
Embodiment 2:
TFe grade 32.11%, the Iron Ore Containing Tin of Sn content 0.18%, through broken, ore grinding to-0.074mmAccount for 85%; Add respectively additive carbon according to 6%, 12%, 5%, 2%, 1% of Iron Ore Containing Tin mass fractionAcid calcium, sodium carbonate, sodium sulphate, borax, sodium humate, after mixing in disc balling machine pelletizing; Dry pelletizingJoin excessive bituminous coal outward as reducing agent, 900 DEG C of reduction temperatures, recovery time 120min; Reduction roasting productCooling rear ore grinding accounts for 87%, carries out magnetic separation in the magnetic separation strength of 800Gs to-0.074mm. Obtaining tin iron slightly closesIron grade 89.23% in bronze, iron recovery 93.19%; Tin grade 0.50%, the tin rate of recovery 90.31%.
Embodiment 3:
TFe grade 32.11%, the Iron Ore Containing Tin of Sn content 0.18%, through broken, ore grinding to-0.074mmAccount for 83%; Add respectively additive according to 5%, 8%, 3%, 1.5%, 1.6% of Iron Ore Containing Tin mass fractionCalcium carbonate, sodium carbonate, sodium sulphate, borax, sodium humate, carry out briquetting after mixing; Dry agglomerate was joined outwardAmount brown coal as reducing agent, 1000 DEG C of reduction temperatures, recovery time 100min; Reduction roasting product is coolingRear ore grinding accounts for 81%, carries out magnetic separation in the magnetic separation strength of 1500Gs to-0.074mm. Obtain the thick alloyed powder of tin ironMiddle iron grade 88.81%, iron recovery 94.00%; Tin grade 0.50%, the tin rate of recovery 91.67%.
Embodiment 4:
TFe grade 56.31%, the tin-iron mine of Sn content 0.41%, accounts for to-0.074mm through broken, ore grinding83%; Add respectively additive according to 5%, 12%, 4.5%, 1.2%, 1.6% of Iron Ore Containing Tin mass fractionCalcium carbonate, sodium carbonate, sodium sulphate, borax, sodium humate, after mixing in disc balling machine pelletizing; Dry ballGroup is outer joins excessive brown coal as reducing agent, 1000 DEG C of reduction temperatures, recovery time 85min; Reduction roasting is producedThe cooling rear ore grinding of thing accounts for 82%, carries out magnetic separation in the magnetic separation strength of 1000Gs to-0.074mm. Obtain tin iron thickIron grade 90.09% in alloyed powder, iron recovery 92.78%; Tin grade 0.66%, the tin rate of recovery 93.19%.
Embodiment 5:
TFe grade 56.31%, the tin-iron mine of Sn content 0.41%, accounts for to-0.074mm through broken, ore grinding88%; Add respectively interpolation according to 5%, 10.5%, 3.5%, 1.4%, 1.6% of Iron Ore Containing Tin mass fractionAgent calcium carbonate, sodium carbonate, sodium sulphate, borax, sodium humate, after mixing in disc balling machine pelletizing; DryPelletizing is joined excessive brown coal outward as reducing agent, 1025 DEG C of reduction temperatures, recovery time 90min; Reduction roastingThe cooling rear ore grinding of product accounts for 82%, carries out magnetic separation in the magnetic separation strength of 1500Gs to-0.074mm. Obtain tin ironIron grade 91.81% in thick alloyed powder, iron recovery 89.12%; Tin grade 0.68%, the tin rate of recovery 90.43%.
Embodiment 6:
TFe grade 26.30%, stanniferous, the iron tailings of Sn content 0.10%, mine tailing granularity is thin-0.074mmAccount for 91%; Add and add respectively according to 10%, 10.5%, 3.2%, 1%, 1.8% of Iron Ore Containing Tin mass fractionAdd agent calcium carbonate, sodium carbonate, sodium sulphate, borax, sodium humate, after mixing in disc balling machine pelletizing; DryDry pelletizing in rotary kiln taking natural gas as reducing agent, 1050 DEG C of reduction temperatures, recovery time 75min; ReductionThe cooling rear ore grinding of product of roasting accounts for 83%, carries out magnetic separation in the magnetic separation strength of 1200Gs to-0.074mm. ObtainIron grade 91.01% in the thick alloyed powder of tin iron, iron recovery 92.91%; Tin grade 0.33%, the tin rate of recovery89.12％。
Embodiment 7:
TFe grade 46.17%, stanniferous, the iron tailings of Sn content 0.17%, mine tailing granularity is thin-0.074mmAccount for 82%; Add respectively additive according to 5.5%, 12%, 4.5%, 2%, 2% of Iron Ore Containing Tin mass fractionCalcium carbonate, sodium carbonate, sodium sulphate, borax, sodium humate, after mixing in disc balling machine pelletizing; Dry ballGroup in rotary kiln taking natural gas as reducing agent, 950 DEG C of reduction temperatures, recovery time 70min; Reduction roastingThe cooling rear ore grinding of product accounts for 83%, carries out magnetic separation in the magnetic separation strength of 1300Gs to-0.074mm. Obtain tin ironIron grade 89.36% in thick alloyed powder, iron recovery 91.21%; Tin grade 0.34%, the tin rate of recovery 95.31%.
Comparative example 1:(does not use additive)
TFe grade 46.17%, stanniferous, the iron tailings of Sn content 0.17%, mine tailing granularity is thin-0.074mmAccount for 82%; By its pelletizing, dry after again in rotary kiln taking natural gas as reducing agent, 950 DEG C of reduction temperatures,Recovery time 70min; The cooling rear ore grinding of reduction roasting product accounts for 83% to-0.074mm, at the magnetic of 1300GsSelect intensity to carry out magnetic separation. Obtain iron grade 78.16% in the thick alloyed powder of tin iron, iron recovery 31.01%; Tin productPosition 0.13%, the tin rate of recovery 25.55%.
Comparative example 2～8:
Other experimental conditions, with embodiment 7, only change additive composition (accounting for the mass percent of tin iron material), obtainShown in the indices of the thick alloyed powder of tin iron sees the following form.
From data in table, a kind of method of being prepared the thick alloyed powder of stanniferous iron by Iron Ore Containing Tin of the present invention, addsUse, composition and the consumption of agent are one of crucial governing factors, can from embodiment 7 and comparative example 1～8Go out, whether use the composition of additive, additive, proportioning to reclaim and have very large shadow the separation of the thick alloyed powder of tin ironRing, each additive just can play the best use of under the composition of optimizing and conditions of mixture ratios.
Claims (8)
1. a method of being prepared the thick alloyed powder of tin iron by Iron Ore Containing Tin, is characterized in that: by Iron Ore Containing Tin fragmentation,After levigate, with compound additive mixing agglomeration; Gained agglomerate after drying, enters at 900～1050 DEG C of temperatureRow reduction roasting; Reduction roasting product successively through supercooling, fragmentation and levigate after, magnetic separation separates, and obtains thick tinIron alloy powder; Described compound additive is pressed matter by calcium carbonate, sodium carbonate, sodium sulphate, borax and sodium humateAmount is than 5～10:8～12:3～5:1～2:1～2 composition.
2. the method for being prepared the thick alloyed powder of tin iron by Iron Ore Containing Tin according to claim 1, is characterized in that:The quality of calcium carbonate, sodium carbonate, sodium sulphate, borax and sodium humate be respectively Iron Ore Containing Tin quality 5～10%,8～12%, 3～5%, 1～2% and 1～2%.
3. the method for being prepared the thick alloyed powder of tin iron by Iron Ore Containing Tin according to claim 1, is characterized in that:It is 500～1500Gs that described magnetic separation separates the magnetic field intensity adopting.
4. the method for being prepared the thick alloyed powder of tin iron by Iron Ore Containing Tin according to claim 1, is characterized in that:Described reduction roasting adopts coal and/or natural gas as reducing agent.
5. the method for being prepared the thick alloyed powder of tin iron by Iron Ore Containing Tin according to claim 1, is characterized in that:The described reduction roasting time is 60～120min.
6. according to preparing the method for the thick alloyed powder of tin iron, its spy by Iron Ore Containing Tin described in claim 1～5 any oneLevy and be: described Iron Ore Containing Tin is after broken and levigate, and granularity is satisfied-0.074mm grade mass percentContent accounts for more than 80%.
7. the method for being prepared the thick alloyed powder of tin iron by Iron Ore Containing Tin according to claim 6, is characterized in that:Described Iron Ore Containing Tin is at least one in tin-iron mine raw ore, tin-iron mine milltailings, high ferro tin metallurgical slag.
8. according to preparing the method for the thick alloyed powder of tin iron, its spy by Iron Ore Containing Tin described in claim 1～5 any oneLevy and be: described reduction roasting product is after broken and levigate, and granularity is satisfied-0.074mm grade quality hundredProportion by subtraction content accounts for more than 80%.
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Cited By (2)
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| 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 |
| CN107034354A (en) * | 2017-04-28 | 2017-08-11 | 中南大学 | Additive and tin iron tailings calcification baking Separation of Tin iron method for strong permanent magnet ore deposit type tin iron tailings calcification baking |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN107034354A (en) * | 2017-04-28 | 2017-08-11 | 中南大学 | Additive and tin iron tailings calcification baking Separation of Tin iron method for strong permanent magnet ore deposit type tin iron tailings calcification baking |
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