CN104911355A - Production method of titanium-rich material by direct stream closed submerged arc furnace - Google Patents
Production method of titanium-rich material by direct stream closed submerged arc furnace Download PDFInfo
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- CN104911355A CN104911355A CN201510176477.XA CN201510176477A CN104911355A CN 104911355 A CN104911355 A CN 104911355A CN 201510176477 A CN201510176477 A CN 201510176477A CN 104911355 A CN104911355 A CN 104911355A
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Abstract
The invention provides a production method of a titanium-rich material by a direct stream closed submerged arc furnace. The method comprises the steps of: mixing and milling titanium ore powder and anthracite powder; adding a paper pulp binder and water, and stirring to a wet state; pressing and drying to obtain finished pellets; transferring the finished pellets into a rotary hearth furnace for pre-reduction, lowering the temperature of the rotary hearth furnace to no higher than 800 DEG C, transferring the metal pellets into a sealed cooling furnace filled with nitrogen protection and cooling to room temperature; weighing the cooled metal pellets, adding the metal pellets into a direct current closed submerged arc furnace, adding titanium ore powder and anthracite powder, reacting continuously, discharging slag and tapping, wherein the feeding and power supply is non-stop during the slag discharging and tapping process; cooling the slag lump in a slag lump disc to room temperature, progressively breaking, removing iron, grinding, sieving and packaging to obtain a titanium-rich material; and cast iron castings or cast directly casting the molten iron into casting or iron ingots. The method provided by the invention reduces the power consumption and production cost in the production process of slag, improves productivity, and reduces the pollution to the environment.
Description
Technical field
The invention belongs to metallurgical engineering field, especially relate to a kind of method that straight airtight stream mineral hot furnace produces rich titanium material.
Background technology
For the production of rich titanium material, current domestic main employing two kinds of methods: unistage type and two-part.Concentrated ilmenite and reductive agent are directly joined in mineral hot furnace, makes ferric oxide change fe into and make iron be separated acquisition with slag to be rich in TiO through high arc temperature melting and furnace reduction
2slag is unistage type; Most of ferric oxide in ore is reduced in the solid state concentrated ilmenite powder direct-reduction become metallic iron and obtain metallized pellet; Again prereduced metal pellet melted subsequently and the ferric oxide be not reduced reduced further and makes iron be separated acquisition with slag to be rich in TiO
2slag and molten iron be two-part method.
At present, unistage type technique is still the main mode of production that the whole world smelts rich titanium material, and the output that unistage type technique obtains rich titanium material accounts for 85 ~ 90% of the rich titanium material of electric furnace, and two stage process accounts for 10 ~ 15%.In China, the smelting of rich titanium material almost all adopts unistage type technique, and two stage process still carries out in pilot experiment in Sichuan Long Mang group and Panzhihua Iron and Steel Group company.Compared with unistage type technique, two stage process has the outstanding advantages such as the high and overall power consumption of rich titanium material production capacity is low, is the novel process for smelting of a kind of advanced person.But no matter be the mineral hot furnace that unistage type technique or two stage process adopt above-mentioned be all Alternating Current Power Supply, they have plenty of closed; Has plenty of semi-hermetic type; What also have is non-closed.The main drawback exchanging mineral hot furnace is that consumption of electrode is high and power consumption is large, and direct-current closed mineral hot furnace can make up the deficiency exchanging mineral hot furnace, is the direction of Future Development.
Summary of the invention
For Shortcomings in prior art, the invention provides a kind of method that straight airtight stream mineral hot furnace produces rich titanium material.
The present invention realizes above-mentioned technical purpose by following technique means.
Straight airtight stream mineral hot furnace produces a method for rich titanium material, comprises the steps:
(1) by ilmenite concentrate powder and reductive agent pulverized anthracite according to (90 ~ 95): the ratio mixing of (5 ~ 10), ball milling, obtain raw mixture;
(2) add in raw mixture and account for the paper pulp binding agent of its total mass 1 ~ 3% and the water of 2 ~ 6% is stirred to wet shape, repressed, dry after obtain finished pellet, the moisture≤3wt% of described finished pellet;
(3) proceed in rotary hearth furnace by described finished pellet, the reduction temperature controlling rotary hearth furnace is 1350 ~ 1450 °, and recovery time 0.2 ~ 0.5h, obtains the metallized pellet of degree of metalization >=50%; After reduction terminates until rotary hearth furnace temperature be reduced to≤800 DEG C time, metallized pellet is moved into a sealing, be cooled to room temperature in the cool furnace that is full of nitrogen protection, must cool metallized pellet afterwards;
(4) metallized pellet after described cooling is weighed, and add in direct-current closed mineral hot furnace through transmission belt, add again subsequently and account for the ilmenite concentrate powder of metallized pellet total mass 10 ~ 15wt% and the pulverized anthracite of 5 ~ 10wt% after cooling, described ilmenite concentrate powder water content≤3wt% and composition is identical with the ilmenite concentrate powder in step (1); Described pulverized anthracite composition is identical with the pulverized anthracite in step (1); The smelting temperature controlling direct-current closed mineral hot furnace is 1750 ~ 1850 DEG C, first slagging after successive reaction 1 ~ 2h, after tap a blast furnace, slagging and period of tapping a blast furnace feed in raw material and do not stop, power and do not stop;
(5) slag of slagging gained sticks together in slag pan, to be cooled to after room temperature after fragmentation step by step, deironing, grinding, screening and packaging process to obtain rich titanium material, and the molten iron of the gained that taps a blast furnace can direct pouring cast part or cast ingot iron.
Preferably, in the described ilmenite concentrate powder of step (1): TiO
2>=50wt%, TFe 30 ~ 40wt%, MgO+CaO≤1.5wt%, P≤0.05wt%, S≤0.03wt%, Th+U≤15ppm, its order number is 160 ~ 200 orders.
Preferably, in step (1) described pulverized anthracite: S≤0.2wt%, ash content≤10wt%, fixed carbon content >=90wt%, its order number is 140 ~ 200 orders.
Preferably, the time of ilmenite concentrate powder and pulverized anthracite ball milling described in step (1) is 50 ~ 80min, and material ball ratio is (9 ~ 11): 1.
Preferably, described in step (2), finished pellet is ellipticity, and volume is: length 23 ~ 27mm × semi-major axis diameter 18 ~ 22mm × minor semi-axis diameter 10 ~ 14mm.
Preferably, direct-current closed mineral hot furnace described in step (4) comprises a solid graphite electrode and clavate backflow bottom electrode, also be equipped with electric arc correction, water-cooled dross furnace wall and water-cooled top arrangement, and each process parameter control is completed by the computer controlled automatic of central control chamber.
Preferably, described in step (4), the temperature of slagging controls at >=1750 DEG C.
Preferably, slag described in step (5) stick together granularity be the titanium slag of 0.106 ~ 0.85mm as the rich titanium material of chloride slag, be less than the titanium slag of 0.106mm as the rich titanium material of sulfate slag.
Beneficial effect of the present invention is:
Straight airtight stream mineral hot furnace of the present invention produces the method for rich titanium material, adopts the two-part method of rotary hearth furnace prereduction and the rich titanium material of direct-current closed mineral hot furnace melting continuous seepage.Production capacity because of a direct-current closed mineral hot furnace is approximately 2 ~ 2.5 times of the discontinuous reinforced airtight interchange mineral hot furnace of equal-wattage, and consumption of electrode is low and power consumption is low, the voltage fluctuation that DC-ore-heating furnace causes prime electrical network is lower by about 30 ~ 50% than exchanging stove, less to the impact of electrical network, thus make the method significant for the power consumption reduced in titanium slag production process, reduction production cost, minimizing environmental pollution and raising production capacity.
Accompanying drawing explanation
Fig. 1 is the process flow sheet that straight airtight stream mineral hot furnace of the present invention produces the method for rich titanium material.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment, the present invention is further illustrated, but protection scope of the present invention is not limited to this.
Embodiment 1
Be TiO by composition
2: the ilmenite concentrate powder of 52wt%, TFe:33.5wt%, MgO:0.13wt%, CaO:0.018wt%, P:0.03wt%, S:0.015wt%, Th+U:12ppm makes its order number be 160 ~ 200 orders for 1.5 hours in grinding in ball grinder.By pulverized anthracite (S:0.2wt%, ash content: 8wt%, fixed carbon content: 95wt%) and above-mentioned ilmenite concentrate powder, proportionally 95:5 mixes in damp mill, ball milling obtains raw material, time 60min, material ball ratio 10:1.
Raw material after mixed is joined in sand mill and carries out mechanically mixing again, the water of the paper pulp binding agent and 4wt% that simultaneously add 2wt% stir material is mixed wet.Afterwards, wet feed is joined continuously the oval mini-pellets being pressed into length 23 ~ 27mm × semi-major axis diameter 18 ~ 22mm × minor semi-axis diameter 10 ~ 14mm in two roller ball press; Made a gift to someone by mini-pellets in drying grate and dry, dry gas temperature 265 DEG C, after drying, the moisture of finished pellet is lower than 3wt%, is metallized pellet by finished pellet feeding rotary hearth furnace system reducing after ovens dry; The temperature controlling reduction section is 1350 DEG C, and reduction 0.3h, obtains the metallized pellet of degree of metalization >=50%; Pelletizing to metalization is entering in the annular fluidized bed cool furnace being filled with nitrogen protection gas be cooled to room temperature lower than discharging from rotary hearth furnace when 800 DEG C.Afterwards, with transmission belt, metallized pellet is poured in the airtight feed bin of a high position of direct-current closed mineral hot furnace, described direct-current closed mineral hot furnace comprises a solid graphite electrode and clavate backflow bottom electrode, also be equipped with electric arc correction, water-cooled dross furnace wall and water-cooled top arrangement, and each process parameter control is completed by the computer controlled automatic of central control chamber.Water content≤3wt% above-mentioned ilmenite concentrate powder again with addition of 10wt% while metallized pellet adds in stove continuously joins continuously in stove and carries out melting process together with the above-mentioned pulverized anthracite of 5wt%.Between smelting period, the temperature in titanium slag molten bath remains on 1800 DEG C, continuous blanking slagging and tapping a blast furnace after 1.5 hours.First slag tap and tap a blast furnace afterwards, tapping temperature controls at 1750 DEG C, and slagging and the period mineral hot furnace of tapping a blast furnace reinforced not to be stopped, power and do not stop, and after completing deslagging and tapping a blast furnace, clay all to be inserted with clay gun machine and blocked by cinder notch and iron mouth.
Gained slag to stick together in slag pan after a series of cooling process reaches and carries out fragmentation step by step, deironing, grinding, screening and packaging process again after room temperature, granularity be the titanium slag of 0.106 ~ 0.85mm as the rich titanium material of chloride slag, be less than the titanium slag of 0.106mm as the rich titanium material of sulfate slag; Molten iron can direct pouring cast part or cast ingot iron.
After testing: TiO in titanium slag
2equivalent 85 ~ 89wt%, FeO:8 ~ 12wt%, Fe≤1wt%, MgO≤0.15wt%, CaO≤0.5wt%, MnO≤0.5wt%, Al
2o
3≤ 0.5wt%, Cr
2o
3≤ 0.1wt%, S≤0.03wt%, P≤0.03wt%, Si≤0.5wt% produces TiCl
4the rich titanium material of high-quality.
Described embodiment is preferred embodiment of the present invention; but the present invention is not limited to above-mentioned embodiment; when not deviating from flesh and blood of the present invention, any apparent improvement that those skilled in the art can make, replacement or modification all belong to protection scope of the present invention.
Claims (8)
1. straight airtight stream mineral hot furnace produces a method for rich titanium material, it is characterized in that, comprises the steps:
(1) by ilmenite concentrate powder and reductive agent pulverized anthracite according to (90 ~ 95): the ratio mixing of (5 ~ 10), ball milling, obtain raw mixture;
(2) add in raw mixture and account for the paper pulp binding agent of its total mass 1 ~ 3% and the water of 2 ~ 6% is stirred to wet shape, repressed, dry after obtain finished pellet, the moisture≤3wt% of described finished pellet;
(3) proceed in rotary hearth furnace by described finished pellet, the reduction temperature controlling rotary hearth furnace is 1350 ~ 1450 °, and recovery time 0.2 ~ 0.5h, obtains the metallized pellet of degree of metalization >=50%; After reduction terminates until rotary hearth furnace temperature be reduced to≤800 DEG C time, metallized pellet is moved into a sealing, be cooled to room temperature in the cool furnace that is full of nitrogen protection, must cool metallized pellet afterwards;
(4) metallized pellet after described cooling is weighed, and add in direct-current closed mineral hot furnace through transmission belt, add again subsequently and account for the ilmenite concentrate powder of metallized pellet total mass 10 ~ 15wt% and the pulverized anthracite of 5 ~ 10wt% after cooling, described ilmenite concentrate powder water content≤3wt% and composition is identical with the ilmenite concentrate powder in step (1); Described pulverized anthracite composition is identical with the pulverized anthracite in step (1); The smelting temperature controlling direct-current closed mineral hot furnace is 1750 ~ 1850 DEG C, first slagging after successive reaction 1 ~ 2h, after tap a blast furnace, slagging and period of tapping a blast furnace feed in raw material and do not stop, power and do not stop;
(5) slag of slagging gained sticks together in slag pan, to be cooled to after room temperature after fragmentation step by step, deironing, grinding, screening and packaging process to obtain rich titanium material, and the molten iron of the gained that taps a blast furnace can direct pouring cast part or cast ingot iron.
2. a kind of straight airtight stream mineral hot furnace according to claim 1 produces the method for rich titanium material, it is characterized in that, in the described ilmenite concentrate powder of step (1): TiO
2>=50wt%, TFe30 ~ 40wt%, MgO+CaO≤1.5wt%, P≤0.05wt%, S≤0.03wt%, Th+U≤15ppm, its order number is 160 ~ 200 orders.
3. a kind of straight airtight stream mineral hot furnace according to claim 1 produces the method for rich titanium material, it is characterized in that, in step (1) described pulverized anthracite: S≤0.2wt%, ash content≤10wt%, fixed carbon content >=90wt%, its order number is 140 ~ 200 orders.
4. a kind of straight airtight stream mineral hot furnace according to claim 1 produces the method for rich titanium material, and it is characterized in that, the time of ilmenite concentrate powder and pulverized anthracite ball milling described in step (1) is 50 ~ 80min, and material ball ratio is (9 ~ 11): 1.
5. a kind of straight airtight stream mineral hot furnace according to claim 1 produces the method for rich titanium material, it is characterized in that, described in step (2), finished pellet is ellipticity, and volume is: length 23 ~ 27mm × semi-major axis diameter 18 ~ 22mm × minor semi-axis diameter 10 ~ 14mm.
6. a kind of straight airtight stream mineral hot furnace according to claim 1 produces the method for rich titanium material, it is characterized in that, direct-current closed mineral hot furnace described in step (4) comprises a solid graphite electrode and clavate backflow bottom electrode, also be equipped with electric arc correction, water-cooled dross furnace wall and water-cooled top arrangement, and each process parameter control is completed by the computer controlled automatic of central control chamber.
7. a kind of straight airtight stream mineral hot furnace according to claim 1 produces the method for rich titanium material, and it is characterized in that, described in step (4), the temperature of slagging controls at >=1750 DEG C.
8. a kind of straight airtight stream mineral hot furnace according to claim 1 produces the method for rich titanium material, it is characterized in that, slag described in step (5) stick together granularity be the titanium slag of 0.106 ~ 0.85mm as the rich titanium material of chloride slag, be less than the titanium slag of 0.106mm as the rich titanium material of sulfate slag.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107208184A (en) * | 2015-01-30 | 2017-09-26 | 奥图泰(芬兰)公司 | Method and apparatus for preparing the slag containing titanium oxide and the pig iron by ilmenite |
| CN114733631A (en) * | 2022-03-31 | 2022-07-12 | 龙佰武定钛业有限公司 | Method and system for quickly crushing, grinding and grading high-titanium slag |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101261078A (en) * | 2008-01-03 | 2008-09-10 | 谢西平 | Large-sized DC hollow electrode hermetic submerged arc furnace |
| CN102399994A (en) * | 2011-11-18 | 2012-04-04 | 攀钢集团研究院有限公司 | Titanium slag smelting method |
| CN103451454A (en) * | 2013-08-26 | 2013-12-18 | 江苏大学 | Method for producing titanium chloride slag |
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2015
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Patent Citations (3)
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| CN101261078A (en) * | 2008-01-03 | 2008-09-10 | 谢西平 | Large-sized DC hollow electrode hermetic submerged arc furnace |
| CN102399994A (en) * | 2011-11-18 | 2012-04-04 | 攀钢集团研究院有限公司 | Titanium slag smelting method |
| CN103451454A (en) * | 2013-08-26 | 2013-12-18 | 江苏大学 | Method for producing titanium chloride slag |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107208184A (en) * | 2015-01-30 | 2017-09-26 | 奥图泰(芬兰)公司 | Method and apparatus for preparing the slag containing titanium oxide and the pig iron by ilmenite |
| CN114733631A (en) * | 2022-03-31 | 2022-07-12 | 龙佰武定钛业有限公司 | Method and system for quickly crushing, grinding and grading high-titanium slag |
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Application publication date: 20150916 |