CN1975305A - Closed electric furnace and titanium slag smelting process - Google Patents
Closed electric furnace and titanium slag smelting process Download PDFInfo
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- CN1975305A CN1975305A CN 200610022504 CN200610022504A CN1975305A CN 1975305 A CN1975305 A CN 1975305A CN 200610022504 CN200610022504 CN 200610022504 CN 200610022504 A CN200610022504 A CN 200610022504A CN 1975305 A CN1975305 A CN 1975305A
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- 239000002893 slag Substances 0.000 title claims abstract description 81
- 239000010936 titanium Substances 0.000 title claims abstract description 51
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 title claims abstract description 45
- 229910052719 titanium Inorganic materials 0.000 title claims abstract description 45
- 238000003723 Smelting Methods 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims abstract description 23
- 239000000463 material Substances 0.000 claims abstract description 15
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 29
- 239000003638 chemical reducing agent Substances 0.000 claims description 26
- 239000000203 mixture Substances 0.000 claims description 18
- 238000005516 engineering process Methods 0.000 claims description 15
- 229910052742 iron Inorganic materials 0.000 claims description 13
- 241001062472 Stokellia anisodon Species 0.000 claims description 12
- 239000012141 concentrate Substances 0.000 claims description 12
- YDZQQRWRVYGNER-UHFFFAOYSA-N iron;titanium;trihydrate Chemical compound O.O.O.[Ti].[Fe] YDZQQRWRVYGNER-UHFFFAOYSA-N 0.000 claims description 12
- 238000004364 calculation method Methods 0.000 claims description 11
- 229910010413 TiO 2 Inorganic materials 0.000 claims description 10
- 239000002994 raw material Substances 0.000 claims description 9
- 239000000571 coke Substances 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 claims description 6
- 238000007664 blowing Methods 0.000 claims description 4
- 239000003818 cinder Substances 0.000 claims description 4
- 230000005611 electricity Effects 0.000 claims description 4
- 238000010079 rubber tapping Methods 0.000 claims description 4
- 235000021050 feed intake Nutrition 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 claims description 2
- 239000000843 powder Substances 0.000 claims description 2
- 239000008187 granular material Substances 0.000 claims 1
- 239000000126 substance Substances 0.000 abstract description 10
- 239000011819 refractory material Substances 0.000 abstract description 4
- 229920001131 Pulp (paper) Polymers 0.000 abstract description 3
- 239000000428 dust Substances 0.000 abstract description 3
- 239000000446 fuel Substances 0.000 abstract description 3
- 239000000779 smoke Substances 0.000 abstract description 3
- 238000007789 sealing Methods 0.000 abstract description 2
- 239000010426 asphalt Substances 0.000 abstract 2
- 239000000853 adhesive Substances 0.000 abstract 1
- 230000001070 adhesive effect Effects 0.000 abstract 1
- 239000004615 ingredient Substances 0.000 abstract 1
- 231100000331 toxic Toxicity 0.000 abstract 1
- 230000002588 toxic effect Effects 0.000 abstract 1
- 230000007306 turnover Effects 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 16
- 238000005272 metallurgy Methods 0.000 description 12
- 238000005065 mining Methods 0.000 description 12
- 238000007670 refining Methods 0.000 description 12
- 238000012360 testing method Methods 0.000 description 12
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 10
- 229910000805 Pig iron Inorganic materials 0.000 description 7
- 229910000831 Steel Inorganic materials 0.000 description 7
- 239000010959 steel Substances 0.000 description 7
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 6
- 239000002253 acid Substances 0.000 description 4
- 229910001051 Magnalium Inorganic materials 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 3
- RHZUVFJBSILHOK-UHFFFAOYSA-N anthracen-1-ylmethanolate Chemical compound C1=CC=C2C=C3C(C[O-])=CC=CC3=CC2=C1 RHZUVFJBSILHOK-UHFFFAOYSA-N 0.000 description 3
- 239000003830 anthracite Substances 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- 229910004298 SiO 2 Inorganic materials 0.000 description 2
- 241001417490 Sillaginidae Species 0.000 description 2
- 239000012491 analyte Substances 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 239000003546 flue gas Substances 0.000 description 2
- 239000003205 fragrance Substances 0.000 description 2
- 239000002737 fuel gas Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 231100000614 poison Toxicity 0.000 description 2
- 230000007096 poisonous effect Effects 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 229910001021 Ferroalloy Inorganic materials 0.000 description 1
- 238000002441 X-ray diffraction Methods 0.000 description 1
- 235000014121 butter Nutrition 0.000 description 1
- 238000005255 carburizing Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000008393 encapsulating agent Substances 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000003500 flue dust Substances 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000010721 machine oil Substances 0.000 description 1
- 238000007885 magnetic separation Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 244000144985 peep Species 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- MTPVUVINMAGMJL-UHFFFAOYSA-N trimethyl(1,1,2,2,2-pentafluoroethyl)silane Chemical compound C[Si](C)(C)C(F)(F)C(F)(F)F MTPVUVINMAGMJL-UHFFFAOYSA-N 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention relates to a closed electric furnace and a process for smelting titanium slag by the closed electric furnace. Wherein, the electrode hole of the sealed electric furnace adopts flexible dry sealing; the operating power of the electric furnace is 3200-8400 kVA; the center circle of the electric furnace is 1500-2350 mm; each feed pipe 8a, 8b is independently controlled. According to the process for smelting titanium slag by using the closed electric furnace, provided by the invention, a layer of high-melting-point substance with the thickness of 100-150 mm is hung on the furnace wall to form furnace protecting slag by adopting special ingredients and a smelting process when a newly built furnace is opened, so that a refractory material is protected. Compared with the flow of an open furnace or a short smoke hood semi-closed furnace, the titanium slag smelting process of the closed furnace provided by the invention has the following steps: no smoke and dust and no noise are generated during smelting; (2) the furnace condition is stable, furnace burden is not crusted, phenomena such as material collapse and large slag turnover can not occur, and furnace pounding is not needed; (3) no consumption of adhesives such as asphalt and paper pulp; the furnace gas is mainly combustible gas and does not contain toxic and malodorous substances such as asphalt decomposers and the like; (4) the furnace gas is not directly diffused, the sensible heat can be used for preheating the furnace charge, and the furnace gas can be used as industrial fuel or reducing gas after being purified.
Description
Technical field
The present invention relates to a kind of closed electric furnace and corresponding titanium slag smelting process, belong to titanizing worker field.
Background technology
The titanium slag industry of China mainly is distributed in ground such as Panzhihua, Yunnan, Guangxi, Jinzhou, Guizhou, and used electric furnace all is uncovered electric furnace or electric furnace with low hood, has dust, waste gas and noise three big severe contaminations.
The tackling of key scientific and technical problems of country " six or five ", " the Seventh Five-Year Plan " and " 95 " three phases has been experienced in the titanium slag technological development of China, and the test of outbalance has:
(1) pre-oxidation process test: 1980～nineteen eighty-two, experimental study was born by the total institute of the coloured research in Beijing, jinzhou Ferroalloy Plant, Shenyang magnalium designing institute and Beijing Iron and Steel Research Geueral Inst.Process route is: ilmenite concentrate → rotary kiln oxidizing roasting → closed electric furnace is smelted (adding the reducing agent metallurgical coke) → titanium slag and half steel.Testing furnace is the 187kVA closed electric furnace.
(2) prereduction engineer testing: 1979～nineteen eighty-three.Bear by Panzhihua iron and steel research institute and Kweiyang magnalium designing institute.Process route is: ilmenite concentrate → ore grinding → make ball → rotary kiln reduction → magnetic separation → electric furnace smelting → titanium slag and half steel.Testing furnace is the 250kVA closed electric furnace.
(3) fine ore is planted directly into furnaceman: carried out in 1984～1985, and born by Panzhihua iron and steel research institute and Kweiyang magnalium designing institute, process route is: ilmenite concentrate → closed electric furnace is smelted (adding the reducing agent metallurgical coke) → titanium slag and half steel.Testing furnace is the 250kVA closed electric furnace.
Up to now, all on the small-power testing furnace, carry out about the overwhelming majority work of closed electric furnace smelting titanium slag.Because in the titanium slag smelting process, furnace charge chemism height, conductivity variations are big, viscosity with temperature and furnace run change greatly, working of a furnace instability, and electrode array dynamic frequency height, amplitude are big, furnace charge heavy corrosion furnace wall refractory material.Medium-sized, large-scale closed electric furnace and corresponding titanium slag smelting technique there is no the example of successful implementation.
Summary of the invention
The object of the present invention is to provide a kind of closed electric furnace and closed electric furnace smelting titanium slag technology.
The closed electric furnace of smelting titanium slag provided by the invention comprises the airtight body of heater that shell, bell, furnace wall constitute; electrode vertically inserts in the body of heater by the clamper clamping; upper of furnace body also is provided with furnace gas pipeline, side feed pipe, intermediate feed pipe; and setting out cinder notch, tapping hole in the body of heater bottom, the furnace wall inwall has the furnace retaining slag of one deck protection furnace wall.
Sealed furnace smelting titanium slag technology provided by the invention may further comprise the steps:
(1) charging: powder raw material ilmenite concentrate and reducing agent coke or anthracitic mixture are sent into electric furnace by side feed pipe, intermediate feed pipe after the furnace gas preheating; Added in 30～150 minutes; The reducing agent consumption is pressed in the raw material ilmenite concentrate 30% TiO
2Be reduced into Ti
3O
5, Fe
2O
3All be converted into FeO, keep the FeO of 5-15% in the slag, all the other Restore Alls are that metallic iron calculates;
(2) smelt: send electricity, sending electrical power is 4000～5000KVA, keeps 1200 ℃～2000 ℃ of the interior temperature of charge of stove, continues electrical heating 10～90 minutes;
(3) tap a blast furnace, slag tap.
Newly build electric furnace and increase following technology formation furnace retaining slag before use:
A, furnace temperature is risen to 800 ℃～1400 ℃; B, charging: wherein the reducing agent consumption is 120%～180% of an amount of calculation; B, feed intake finish after, continue heating 40～100 minutes, make charge-temperature reach 1900 ℃～2200 ℃, have a power failure and slag tap, tap a blast furnace, make the high-melting-point material that articulates a layer thickness 100～150mm on the furnace wall.
Long period blowing out blow-on is again smelted, and first stove feeds intake in the following ways: a, charging make the interior inventory of stove reach 1/4～2/3 of normal smelting inlet amount; B, energising make the interior temperature of charge of stove reach 900 ℃～1600 ℃, and furnace charge is all melted; C, will remain furnace charge and continue add in the stove, smelt 30～90 minutes; D, tap a blast furnace, slag tap; E, smelt according to (1)-(3) step.
Sealed furnace smelting titanium slag technology provided by the invention is compared with present domestic present open-heater or low hood semi-hermetic stove flow process, has following distinguishing feature:
(1) smelt no flue dust, noiselessness, furnace gas can utilize after purifying.
(2) working of a furnace is stable, and furnace charge does not crust, and the phenomenons such as material, slag turning over of can not collapsing need not to smash stove.
(3) do not consume binding agents such as pitch, paper pulp, furnace gas is mainly fuel gas, not poisonous odorant such as bituminous analyte.
(4) furnace gas does not directly diffuse, and its sensible heat can be directly used in the preheating furnace charge, can be used as industrial fuel or reducing gases after the flue gas cleaning.
Description of drawings
Fig. 1 electric cooker structure sketch,
Wherein, 1-electrode; 2-clamper; 3-furnace gas pipeline; 4-go into the stove furnace charge; 5-slag; 6-iron; 7-shell; 8a, 8b-feed pipe; 9-bell; 10-manhole; 11-furnace wall; 12-furnace retaining slag; 13-slag notch; 14-tapping hole; 15-peep hole.
Fig. 2 work molten bath schematic diagram of bowing illustrates the arrangement of electrodes situation, and wherein 20 is utmost point heart circle, and 21 are extremely all molten baths.
Fig. 3 process chart.
The specific embodiment
Closed electric furnace provided by the invention comprises the obturator that shell 7, bell 9, furnace wall 11 constitute; electrode 1 vertically inserts in the body of heater by clamper 2 clampings; upper of furnace body also is provided with furnace gas pipeline 3, side feed pipe 8a, intermediate feed pipe 8b; and setting out cinder notch 13, tapping hole 14 in the body of heater bottom, furnace wall 11 inwalls have the furnace retaining slag 12 of one deck protection furnace wall.
According to actual conditions manhole 10, peep hole 15 can also be set.
Wherein, electrode hole and bell adopt flexible dry-type encapsulated, the dry-type encapsulated materials such as adopting graphite powder, expanded graphite, titanium slag, ilmenite concentrate, gravel that is meant of described flexibility is as encapsulant, be characterized in: fusing point height, coefficient of friction are little, close with the coefficient of expansion of steel and refractory material, sealing be can not influence, machine oil, butter etc. do not needed to use yet owing to variations in temperature is bigger.Side feed pipe 8a, intermediate feed pipe 8b can be provided with 1～18 respectively, and wherein preferred scheme is that side feed pipe 8a is provided with 6 at least, and intermediate feed pipe 8b is provided with 1 at least, and each feed pipe evenly distributes, respectively control separately.
Electric furnace provided by the invention, its operand power can be adjusted between 3200kVA～8400kVA, uses 3 electrodes usually, and its utmost point heart circle can be adjusted between 1500mm～2350mm; Described utmost point heart circle is 3 circles that electrode centers surrounds, and sees Fig. 2.Intermediate feed pipe 8b is arranged in the utmost point heart circle, and it is outside that side feed pipe 8a is arranged on utmost point heart circle.
Sealed furnace smelting titanium slag provided by the invention technological process is as follows: (see figure 3)
(1) charging: the powdery furnace charge is sent into electric furnace by side feed pipe 8a, intermediate feed pipe 8b after the furnace gas preheating; The reducing agent consumption is pressed in the raw material ilmenite concentrate 30% TiO
2Be reduced into Ti
3O
5, Fe
2O
3All be converted into FeO, keep the FeO of 5-15% in the slag, all the other Restore Alls are that metallic iron calculates;
(2) smelt: send electricity, sending electrical power is 4000～5000KVA, keeps 1200 ℃～2000 ℃ of the interior temperature of charge of stove, continues electrical heating 10～90 minutes;
(3) tap a blast furnace, slag tap.
Wherein, all furnace charges keep molten condition in step (2) smelting process, keep malleation during smelting in the stove, and furnace gas enters raw material preheating equipment by furnace gas pipeline, in order to the mixture of preheating ilmenite concentrate and reducing agent.
If newly building electric furnace increases following technology before use and makes and form the furnace retaining slag in the furnace wall:
A, furnace temperature rise to 800 ℃～1400 ℃; B, charging: wherein the reducing agent consumption is 120%～180% of an amount of calculation; C, feed intake finish after, continue heating 40～100 minutes, make charge-temperature reach 1900 ℃～2200 ℃, have a power failure and slag tap, tap a blast furnace, make the high-melting-point material that articulates a layer thickness 100～150mm on the furnace wall.Described high-melting-point material is that fusing point is that 3140 ℃ key component is the titanium slag of titanium carbide.
Long period blowing out blow-on is again smelted, and first stove feeds intake in the following ways: a, charging make the interior inventory of stove reach 1/4～2/3 of normal smelting inlet amount; B, energising make the interior temperature of charge of stove reach 900 ℃～1600 ℃, and furnace charge is all melted; C, will remain furnace charge and continue add in the stove, smelt 30～90 minutes; D, tap a blast furnace, slag tap.After this smelt according to normal process.
During normal the smelting, the reducing agent consumption calculates as follows in the furnace charge: 30% TiO in the raw material
2Be reduced into Ti
3O
5, Fe
2O
3All be converted into FeO, keep the FeO of 5-15% in the slag, all the other Restore Alls are metallic iron, and consider the carburizing of iron in the molten bath, suppose that the carbon amount of electrode participation reaction is suitable with scaling loss carbon amount, suitably adjust reduction degree according to finished product dreg chemistry analysis result.Consider furnace run, the reducing agent proportioning is lower than amount of calculation in preceding a part of furnace charge, and the reducing agent proportioning is higher than amount of calculation in a part of furnace charge in back.Such as: reducing agent is 90% of amount of calculation with addition of amount in preceding 2/3 furnace charge, and back 1/3 is 120% of an amount of calculation.
Secondary voltage can be in 59V～200V value.Studied secondary voltage in the test to smelting the influence of the working of a furnace, power consumption etc., preferred version is 150V～180V.
Side feed pipe 8a, intermediate feed pipe 8b can distinguish independent control, when stove internal power changes in distribution, and can be by adjusting cloth scheme stable furnace condition.Preferred feed, send electric scheme to be: side feed pipe 8a charging rate is controlled at 5kg/min～15kg/min, and intermediate feed pipe 8b is controlled at 50kg/min～70kg/min, and the inlet amount summation of all 8a equates with 8b.In the charging stage, sending electrical power is 6000kVA～7000kVA, smelts and the overheated stage, and sending electrical power is 4000kVA～5000kVA.
Because the body of heater totally-enclosed, charging with give electric no-float, furnace charge enters fusing immediately in the stove, keeps liquid charge level in the smelting process; The gas of emitting during smelting makes the inner malleation that keeps of closed electric furnace.
Following scheme is more excellent during smelting titanium slag:
(1), adopt bavin baking in 60 hours, carbon baking in 48 hours, electricity baking in 12 hours, make and newly build airtight titanium slag stove and rise to duty.By dross protection, prevent the erosion of liquid slag, iron to furnace wall and furnace bottom.Furnace temperature is not less than 1200 ℃ when feeding intake.
(2) non-new brickwork blow-on step again after blowing out is: a, make that inventory reaches 1/4～2/3 of the maximum buildup amount of normal smelting in the stove; B, energising make the interior temperature of charge of stove reach 1200 ℃～1600 ℃, melting batch; C, normal charging, send.
(3), directly into stove, utmost point heart circle feed is half of total stuff amount to the powdery furnace charge after the furnace gas preheating, reducing agent is 90% of amount of calculation with addition of amount in preceding 2/3 furnace charge, back 1/3 is 120% of an amount of calculation.
(4), adopt Quan Yunkuang, Yun Kuang Pan Kuang to mix the ore deposit, full Pan Kuang all can make the good titanium slag of solubility in acid, adopt coke powder, anthracite or Jiao, coal mixtures as reducing agent all can, can reduce iron quality but increase the coal consumption.All adopt the high-quality coke powder as reducing agent, can make the low-sulfur pig iron of S≤0.08%.Titanium in the gained titanium slag mainly exists with dititanate, anatase, metatitanic acid iron, four kinds of forms of pseudobrookite.
(5), smelt secondary voltage 150V～180V.
The specific embodiment of form is described in further detail foregoing of the present invention again by the following examples.But this should be interpreted as that the scope of the above-mentioned theme of the present invention only limits to following example, all technology that realizes based on foregoing of the present invention all belong to scope of the present invention.
One, smelting test raw material
Smelting test has adopted Panzhihua ilmenite concentrate and two kinds of raw materials of Yunnan titanium ore, its composition such as table 1:
Table 1 titanium ore composition (wt%)
Two kinds of reducing agents of coke and anthracite have been selected for use, reducing agent and ash content composition such as table 2, table 3.
Table 2 reducing agent leading indicator
Table 3 reducing agent ash content chemical composition
Two, full Yunnan mining and metallurgy refining
Utilize the ore deposit, Yunnan to smelt with addition of coke, the anthracite of difference amount, material, power consumption situation see Table 4:
Material, the power consumption situation of the full cloud mining and metallurgy refining of table 4
| Heat (batch) number | The ore deposit amount, the t/ stove | Coke powder, the t/ stove | Anchracite duff, the T/ stove | Power consumption, the kWh/t slag | Slag tap the t/ stove | Tap a blast furnace the t/ stove | TiO 2Yield, % |
| Y-01～Y-05 | 12.50 | 1.80 | 0 | 2860 | 6.02 | 3.54 | 94.7 |
| Y-06～Y-10 | 12.80 | 1.80 | 0 | 2833 | 5.95 | 4.72 | 95.2 |
| Y-11～Y-15 | 12.60 | 0.82 | 0.87 | 2212 | 6.88 | 4.68 | 96.5 |
| Y-15～Y-20 | 12.60 | 0.82 | 0.87 | 2192 | 6.95 | 4.61 | 95.7 |
| Y-21～Y-25 | 12.60 | 0 | 1.75 | 2144 | 6.92 | 4.05 | 95.7 |
| Y-26～Y-30 | 12.60 | 0 | 1.75 | 2105 | 6.95 | 4.77 | 95.9 |
This stage TiO
2Power consumption 2285kWh/t slag before the total recovery 95.9%, average furnace.Y-01～Y-10 cinder grade height wherein, average current drain reaches the 2850kWh/t slag.Y11～Y30 average current drain 2160kWh/t slag.The chemical composition of the gained titanium slag and the pig iron sees Table 5, table 6.
The sour molten slag chemical composition of the full cloud mining and metallurgy refining of table 5
The full cloud mining and metallurgy refining of table 6 pig iron composition
| Heat (batch) number | C | Si | P | Mn | S |
| Y-01～Y-05 | 3.45 | 0.12 | 0.061 | 0.15 | 0.081 |
| Y-06～Y-10 | 3.42 | 0.09 | 0.044 | 0.13 | 0.079 |
| Y-11～Y-15 | 3.45 | 0.07 | 0.052 | 0.13 | 0.172 |
| Y-15～Y-20 | 3.52 | 0.09 | 0.073 | 0.16 | 0.168 |
| Y-21～Y-25 | 3.30 | 0.11 | 0.048 | 0.12 | 0.277 |
| Y-26～Y-30 | 3.43 | 0.11 | 0.069 | 0.14 | 0.278 |
Three, mix the mining and metallurgy refining
It is flat to join mineral water according to three kinds of cloud ore deposit: Pan Kuang=70: 30,50: 50,30: 70, has carried out smelting test under different anthracites and dosage of coke.Material, power consumption situation such as table 7.
Table 7 mixes material, the power consumption situation of mining and metallurgy refining
| Heat (batch) number | The ore deposit amount, the t/ stove | Reduction dosage, the t/ stove | Power consumption kWh/t slag | The t/ stove of slagging tap | The t/ stove taps a blast furnace | TiO 2Yield % | ||
| The cloud ore deposit | Pan Kuang | Coke powder t | Anchracite duff | |||||
| H-01～H-05 | 8.8 | 3.8 | 1.52 | 0 | 2210 | 6.90 | 4.33 | 96.3 |
| H-06～H-10 | 8.8 | 3.8 | 0.76 | 0.82 | 2211 | 6.83 | 4.28 | 96.5 |
| H-11～H-15 | 8.8 | 3.8 | 0 | 1.64 | 225 | 6.65 | 4.13 | 95.8 |
| H-16～H-20 | 6.3 | 6.3 | 1.52 | 0 | 2185 | 6.95 | 4.42 | 95.4 |
| H-21～H-25 | 6.3 | 6.3 | 0.76 | 0.82 | 2050 | 6.21 | 4.25 | 95.3 |
| H-26～H-30 | 6.3 | 6.3 | 0 | 1.64 | 2090 | 6.23 | 4.03 | 94.9 |
| H-31～H-35 | 3.8 | 8.8 | 1.52 | 0 | 2123 | 6.88 | 4.0 | 94.8 |
| H-36～H-40 | 3.8 | 8.8 | 0.76 | 0.82 | 2095 | 7.01 | 4.1 | 95.5 |
| H-41～H-45 | 3.8 | 8.8 | 0 | 1.64 | 2073 | 6.65 | 3.99 | 94.9 |
This stage TiO
2Power consumption 2130kWh/t slag before the total recovery 95.4%, average furnace.The chemical composition of the gained titanium slag and the pig iron sees Table 8, table 9.
Table 8 mixes the sour molten slag chemical composition of mining and metallurgy refining
| Heat (batch) number | SiO 2 | Al 2O 3 | CaO | MgO | T TiO2 | Ti 2O 3 | FeO |
| H-01～H-05 | 4.52 | 1.42 | 1.33 | 3.44 | 80.59 | 11.36 | 8.58 |
| H-06～H-10 | 4.64 | 1.51 | 1.53 | 3.62 | 79.04 | 10.92 | 10.04 |
| H-11～H-15 | 4.16 | 1.71 | 0.86 | 3.36 | 77.72 | 7.55 | 12.25 |
| H-16～H-20 | 5.22 | 1.70 | 1.33 | 4.3 | 78.13 | 9.52 | 9.49 |
| H-21～H-25 | 5.29 | 1.78 | 1.40 | 4.38 | 79.59 | l0.59 | 7.64 |
| H-26～H-30 | 4.84 | 1.64 | 1.26 | 4.305 | 77.22 | 8.56 | 11.04 |
| H-31～H-35 | 6.44 | 1.70 | 2.13 | 5.90 | 78.23 | 12.60 | 5.84 |
| H-36～H-40 | 6.17 | 1.51 | 2.04 | 5.92 | 77.25 | 10.49 | 7.95 |
| H-41～H-45 | 6.04 | 1.48 | 1.7 | 5.72 | 76.47 | 10.08 | 9.19 |
Table 9 mixes mining and metallurgy refining pig iron composition
| Heat (batch) number | C | Si | P | Mn | S |
| H-01～H-05 | 3.32 | 0.11 | 0.081 | 0.12 | 0.072 |
| H-06～H-10 | 3.41 | 0.1 | 0.060 | 0.13 | 0.176 |
| H-11～H-15 | 3.49 | 0.11 | 0.068 | 0.16 | 0.181 |
| H-15～H-20 | 3.16 | 0.11 | 0.055 | 0.14 | 0.082 |
| H-21～H-25 | 3.39 | 0.12 | 0.0645 | 0.14 | 0.179 |
| H-26～H-30 | 3.48 | 0.12 | 0.065 | 0.17 | 0.195 |
| H-31～H-35 | 3.05 | 0.11 | 0.0594 | 0.14 | 0.081 |
| H-36～H-40 | 3.36 | 0.14 | 0.0681 | 0.14 | 0.182 |
| H-41～H-45 | 3.45 | 0.13 | 0.062 | 0.17 | 0.213 |
Four, full Panzhihua mining and metallurgy refining
The Panzhihua ilmenite concentrate is smelted with addition of the variety classes reducing agent, material, power consumption situation such as table 14:
Table 10 is climbed material, the power consumption situation of mining and metallurgy refining entirely
| Heat (batch) number | The ore deposit amount, the t/ stove | Coke powder, the t/ stove | Anchracite duff, the t/ stove | Power consumption, the kWh/t slag | Slag tap the t/ stove | Tap a blast furnace the t/ stove | TiO 2Yield, % |
| P-01～P-10 | 11.5 | 1.30 | 0 | 2350 | 6.25 | 3.31 | 93.1 |
| P-11～P-20 | 11.5 | 1.20 | 0 | 2110 | 6.48 | 3.42 | 94.6 |
| P-21～P-30 | 11.5 | 0.60 | 0.63 | 2073 | 6.53 | 3.20 | 95.3 |
| P-31～P-40 | 11.5 | 0 | 1.28 | 2095 | 6.56 | 3.48 | 95.8 |
This takes turns test TiO
2Yield is 95.02%, power consumption 2143kWh before the average furnace.Gained titanium slag, pig iron composition see Table 11, table 12:
Table 11 is climbed the sour molten slag chemical composition of mining and metallurgy refining entirely
| Heat (batch) number | SiO 2 | Al 2O 3 | CaO | MgO | T TiO2 | Ti 2O 3 | FeO |
| P-01～P-10 | 7.65 | 1.08 | 2.83 | 7.04 | 79.64 | 16.22 | 2.32 |
| P-11～P-20 | 7.21 | 1.65 | 2.62 | 6.83 | 77.33 | 13.95 | 4.65 |
| P-21～P-30 | 6.85 | 1.42 | 2.50 | 6.94 | 76.05 | 11.27 | 7.33 |
| P-31～P-40 | 6.54 | 1.35 | 2.27 | 6.66 | 75.97 | 11.09 | 7.96 |
Table 12 is climbed mining and metallurgy refining pig iron composition entirely
| Heat (batch) number | C | Si | P | Mn | S |
| P-01～P-10 | 3.17 | 0.13 | 0.082 | 0.11 | 0.074 |
| P-11～P-20 | 2.89 | 0.12 | 0.066 | 0.14 | 0.082 |
| P-21～P-30 | 3.32 | 0.17 | 0.075 | 0.14 | 0.186 |
| P-31～P-40 | 3.43 | 0.14 | 0.057 | 0.17 | 0.178 |
Five, titanium slag material phase analysis
XRD analysis is the result show, the titanium in the acid-dissolved titanium slag mainly exists with dititanate, anatase, metatitanic acid iron, four kinds of forms of pseudobrookite.
These four kinds of things all have good solubility in acid mutually, and above-mentioned sample is through chemical analysis, its TiO
2Content is 79.5%, and it is 94.6% that the laboratory records acidolysis rate.
In sum, airtight electric furnace furnace operation power provided by the invention can be adjusted between 3200～8400kVA; The utmost point heart circle of electric furnace can be adjusted between 1500～2350mm. Titanium Slag in Smelting with Closed Electric Furnace technique provided by the invention adopts special batching so that furnace wall articulates the high-melting-point substances of a layer thickness 100～150mm and forms the furnace retaining slag, the protection refractory material when new brickwork blow-on. This technique is compared with open-heater or low hood semi-hermetic stove flow process: (1) smelts smoke dust, noiselessness; (2) working of a furnace is stable, and furnace charge does not crust, and the phenomenons such as material, slag turning over of can not collapsing need not to smash stove; (3) do not consume the binding agents such as pitch, paper pulp; Furnace gas is mainly fuel gas, not poisonous, the odorant such as bituminous analyte; (4) furnace gas does not directly diffuse, and its sensible heat can be used for the preheating furnace charge, can be used as industrial fuel or reducing gases after the flue gas cleaning.
Claims (10)
1, the closed electric furnace of smelting titanium slag: it is characterized in that: comprise the airtight body of heater that shell (7), bell (9), furnace wall (11) constitute; electrode (1) vertically inserts in the body of heater by clamper (2) clamping; upper of furnace body also is provided with furnace gas pipeline (3), side feed pipe (8a), intermediate feed pipe (8b); and setting out cinder notch (13), tapping hole (14) in the body of heater bottom, furnace wall (11) inwall has the furnace retaining slag (12) of one deck protection furnace wall.
2, according to the closed electric furnace of the described smelting titanium slag of claim 1, it is characterized in that:
Electrode (1) adopts flexible dry-type encapsulated with bell (9); Furnace operation power is between 3200～8400kVA; The utmost point heart circle of electric furnace is between 1500～2350mm.
3, the closed electric furnace of smelting titanium slag according to claim 1 is characterized in that: side feed pipe (8a), intermediate feed pipe (8b) are provided with 1～18 respectively.
4, sealed furnace smelting titanium slag technology may further comprise the steps:
(1) charging: powder raw material ilmenite concentrate and reducing agent coke or anthracitic mixture are sent into electric furnace by side feed pipe (8a), intermediate feed pipe (8b) after the furnace gas preheating; Added in 30～150 minutes; The reducing agent consumption is pressed in the raw material ilmenite concentrate 30% TiO
2Be reduced into Ti
3O
5, Fe
2O
3All be converted into FeO, keep the FeO of 5-15% in the slag, all the other Restore Alls are that metallic iron calculates;
(2) smelt: send electricity, sending electrical power is 4000～5000KVA, keeps 1200 ℃～2000 ℃ of the interior temperature of charge of stove, continues electrical heating 10～90 minutes;
(3) tap a blast furnace, slag tap.
5, according to the described sealed furnace smelting titanium slag of claim 4 technology, it is characterized in that:
Newly build electric furnace and increase following technology formation furnace retaining slag before use:
A, furnace temperature is risen to 800 ℃～1400 ℃; B, charging: wherein the reducing agent consumption is 120%～180% of an amount of calculation; B, feed intake finish after, continue heating 40～100 minutes, make charge-temperature reach 1900 ℃～2200 ℃, have a power failure and slag tap, tap a blast furnace, make the high-melting-point material that articulates a layer thickness 100～150mm on the furnace wall.
6, according to the described sealed furnace smelting titanium slag of claim 4 technology, it is characterized in that:
Long period blowing out blow-on is again smelted, and first stove feeds intake in the following ways: a, charging make the interior inventory of stove reach 1/4～2/3 of normal smelting inlet amount; B, energising make the interior temperature of charge of stove reach 900 ℃～1600 ℃, and furnace charge is all melted; C, will remain furnace charge and continue add in the stove, smelt 30～90 minutes; D, tap a blast furnace, slag tap: e, smelt according to (1)-(3) step.
7, according to the described sealed furnace smelting titanium slag of claim 4 technology, it is characterized in that:
Side feed pipe (8a), intermediate feed pipe (8b) separate feeds are taked in step (1) charging, and granular material is directly into stove.
8, according to the described sealed furnace smelting titanium slag of claim 4 technology, it is characterized in that: side feed pipe (8a) charging rate is controlled at 5kg/min～15kg/min, and intermediate feed pipe (8b) charging rate is controlled at 50kg/min～70kg/min.
9, according to the described sealed furnace smelting titanium slag of claim 4 technology, it is characterized in that:
All furnace charges keep molten condition in step (2) smelting process, keep malleation during smelting in the stove, and furnace gas enters charging preheating equipment by furnace gas pipeline, in order to the preheating furnace charge.
10, according to the described sealed furnace smelting titanium slag of claim 4 technology, it is characterized in that: reducing agent consumption during charging: reducing agent is 90% of amount of calculation with addition of amount in preceding 2/3 furnace charge, and reducing agent is 120% of amount of calculation with addition of amount in 1/3 furnace charge of back.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101878407B (en) * | 2007-11-21 | 2013-01-09 | 奥图泰有限公司 | Method for feeding material flows from a preheating furnace to a smelting furnace and a preheating system |
| WO2018090867A1 (en) * | 2016-11-21 | 2018-05-24 | 中国恩菲工程技术有限公司 | System and method for preparing titanium slag |
| CN114277214A (en) * | 2021-12-31 | 2022-04-05 | 四川德胜集团钒钛有限公司 | Semisteel smelting furnace and steelmaking method |
-
2006
- 2006-12-14 CN CN 200610022504 patent/CN1975305A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101878407B (en) * | 2007-11-21 | 2013-01-09 | 奥图泰有限公司 | Method for feeding material flows from a preheating furnace to a smelting furnace and a preheating system |
| WO2018090867A1 (en) * | 2016-11-21 | 2018-05-24 | 中国恩菲工程技术有限公司 | System and method for preparing titanium slag |
| CN114277214A (en) * | 2021-12-31 | 2022-04-05 | 四川德胜集团钒钛有限公司 | Semisteel smelting furnace and steelmaking method |
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