CN106521139A - Method for preparing high titanium slag through low temperature reduction and separation of titanium-containing iron ore - Google Patents
Method for preparing high titanium slag through low temperature reduction and separation of titanium-containing iron ore Download PDFInfo
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- CN106521139A CN106521139A CN201710007845.7A CN201710007845A CN106521139A CN 106521139 A CN106521139 A CN 106521139A CN 201710007845 A CN201710007845 A CN 201710007845A CN 106521139 A CN106521139 A CN 106521139A
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- titanium
- containing iron
- iron ore
- reduction
- titanium slag
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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
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/008—Use of special additives or fluxing agents
-
- 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
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/2406—Binding; Briquetting ; Granulating pelletizing
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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
- C22B34/00—Obtaining refractory metals
- C22B34/10—Obtaining titanium, zirconium or hafnium
- C22B34/12—Obtaining titanium or titanium compounds from ores or scrap by metallurgical processing; preparation of titanium compounds from other titanium compounds see C01G23/00 - C01G23/08
- C22B34/1204—Obtaining titanium or titanium compounds from ores or scrap by metallurgical processing; preparation of titanium compounds from other titanium compounds see C01G23/00 - C01G23/08 preliminary treatment of ores or scrap to eliminate non- titanium constituents, e.g. iron, without attacking the titanium constituent
- C22B34/1209—Obtaining titanium or titanium compounds from ores or scrap by metallurgical processing; preparation of titanium compounds from other titanium compounds see C01G23/00 - C01G23/08 preliminary treatment of ores or scrap to eliminate non- titanium constituents, e.g. iron, without attacking the titanium constituent by dry processes, e.g. with selective chlorination of iron or with formation of a titanium bearing slag
Abstract
The invention provides a method for preparing high titanium slag through low temperature reduction and separation of titanium-containing iron ore. According to the method, a pre-oxidation titanium-containing iron ore raw material is used, and a carbonaceous reducing agent and smelting reduction catalysts such as Na2SO4 and FeS are used for reduction production of pig iron and high titanium slag products; compared with a traditional electric furnace smelting titanium slag process, a product can be obtained through reduction for 20 minutes to 40 minutes at a lower temperature ranging from 1200 DEG C to 1500 DEG C, the reduction speed is higher, energy consumption is lower, cost is reduced, and the aims of separating the pig iron and the titanium slag with high efficiency, low consumption and low cost are achieved; meanwhile, the metallization recovery rate of the iron element is improved, and the grade of the obtained high titanium slag is higher; in addition, the main ingredient of tail gas in the reduction process is CO and can be recycled, and the reduction and heating energy consumption is further saved; accordingly, a new process is provided for producing the high titanium slag, and the problems that in the prior art, a high titanium slag preparing process is complex, the production efficiency is low, cost is expensive, and the energy consumption is large are solved.
Description
Technical field
The present invention relates to chemical metallurgy technical field, and in particular to a kind of low-temperature reduction separates titanium-containing iron ore thing and prepares high titanium
The method of slag.
Background technology
Titanium alloy because it is high with intensity, corrosion resistance is good, thermostability is high the features such as be widely used in every field.It is past
Decades, countries in the world are devoted to developing new low cost titanium smelting process.The ilmenite of rich reserves is Titanium or titanium white
The primary raw material of powder production, but its grade is low, it is necessary to first pass through enrichment and be processed as the higher rich-titanium material of grade.It can be seen that, rich-titanium material
Preparation become the important step of Ti industry production process.
At present in the industrial production, the utilization to ilmenite mainly adopts electric furnace smelting process, and the method is first by ferrotianium
Ore deposit and the melting in electric furnace of coal or coke, heating by electric cooker smelt the ferrum oxygen during 8 hours or so make ilmenite to more than 1700 DEG C
Compound is reduced to metallic iron, and slag sluicing system is realized in stove, so as to obtain the pig iron and high titanium slag, as reduction temperature is high, the time
It is long, therefore comprehensive energy consumption is higher.Also, as slag sluicing system is realized in stove, in order to ensure the mobility of gained slag charge, it is necessary to
Contain the FeO for holding 8 ~ 12% in keeping slag, on the one hand cause the grade of gained blast furnace slag low, on the other hand also result in ferrum unit
The degree of metalization of element is not enough, have impact on the response rate to ferrum element.It can be seen that, traditional electric furnace smelting process prepares the side of high titanium slag
Method has the problems such as complex process, high cost, energy consumption be big, therefore needs a kind of new low cost, low energy consumption, high efficiency badly
High titanium slag preparation technology.
The content of the invention
For above-mentioned deficiency present in prior art, it is an object of the invention to provide a kind of low energy consumption, efficient
Low-temperature reduction separates the method that titanium-containing iron ore thing prepares high titanium slag, prepares high titanium slag presence to solve existing electric furnace smelting process
Complex process, low production efficiency, the problems such as with high costs, energy consumption is big.
For achieving the above object, present invention employs following technical scheme：
A kind of low-temperature reduction separates the method that titanium-containing iron ore thing prepares high titanium slag, comprises the steps：
1）Titanium-containing iron ore raw material is carried out into break process, titanium-containing iron ore thing powder is obtained standby；
2）Oxidation processes are carried out to titanium-containing iron ore thing powder, titanium-containing iron ore thing powder oxide is obtained；
3）Add carbonaceous reducing agent and melting and reducing catalyst in titanium-containing iron ore thing powder oxide, and make after mix homogeneously
Ball, obtains compound pelletizing；
4）Compound pelletizing is put in reduction furnace, and protection against oxidation gas is continually fed into into reduction furnace, 1200 ~ 1500
Reduced at a temperature of DEG C, the recovery time is 20 ~ 40 minutes, and tail gas is reclaimed in reduction treatment process；
5）After the completion of reduction, cooling treatment is carried out to the high titanium slag crude product of gained after reduction so that high titanium slag crude product is cooled to room
Temperature；
6）High titanium slag crude product after cooling is carried out into magnetic separation separation after crushing, metallic iron therein is removed, high titanium slag product is obtained
Product.
Above-mentioned low-temperature reduction separates titanium-containing iron ore thing and prepares in the method for high titanium slag, preferably, described containing ferrotianium
Raw mineral materials is ilmenite concentrate, ilmenite, concentrated ilmenite or vanadium titano-magnetite, and wherein TiO2Weight/mass percentage composition be more than 30%.
Above-mentioned low-temperature reduction separates titanium-containing iron ore thing and prepares in the method for high titanium slag, preferably, the step 1）
In, it is desirable in broken gained ilmenite ores powder, granularity accounts for more than the 80% of gross weight in the granule less than 100 mesh.
Above-mentioned low-temperature reduction separates titanium-containing iron ore thing and prepares in the method for high titanium slag, preferably, the step 2）
In, oxidation processes are carried out in oxidizing atmosphere environment of the temperature for 600 ~ 1100 DEG C to titanium-containing iron ore thing powder, oxidization time is
In 20 ~ 80 minutes, and oxidizing atmosphere environment, the volumn concentration of oxygen accounts for more than 20%.
Above-mentioned low-temperature reduction separates titanium-containing iron ore thing and prepares in the method for high titanium slag, preferably, the step 3）
Employed in carbonaceous reducing agent be that the molar content of carbon in coal dust or graphite, and the carbonaceous reducing agent for being added adds and contains
The ratio of the molar content of the oxygen in ilmenite ores powder in institute's oxides-containing iron is 1.1 ~ 1.3：1.
Above-mentioned low-temperature reduction separates titanium-containing iron ore thing and prepares in the method for high titanium slag, preferably, the step 3）
Employed in melting and reducing catalyst be Na2SO4Or FeS, and the addition of melting and reducing catalyst is titanium-containing iron ore thing powder
The 2% ~ 12% of oxide gross mass.
Above-mentioned low-temperature reduction separates titanium-containing iron ore thing and prepares in the method for high titanium slag, preferably, the step 3）
In, the pelletizing granularity of compound pelletizing is 10 ~ 20mm.
Above-mentioned low-temperature reduction separates titanium-containing iron ore thing and prepares in the method for high titanium slag, preferably, the step 4）
In, the tail gas reclaimed during reduction treatment obtains CO (carbon monoxide converter) gas to carry out separating treatment, to as heating
Reduction furnace carries out the fuel of compound pelletizing reduction.
Above-mentioned low-temperature reduction separates titanium-containing iron ore thing and prepares in the method for high titanium slag, preferably, the step 5）
In, it is the protection against oxidation gas that room temperature is continually fed into into reduction furnace to the concrete mode that high titanium slag crude product carries out cooling treatment
Body, until high titanium slag crude product is cooled to room temperature.
Above-mentioned low-temperature reduction separates titanium-containing iron ore thing and prepares in the method for high titanium slag, preferably, the step 5）
In, it is to carry out after the high titanium slag crude product water quenching cooling to reduction gained to the concrete mode that high titanium slag crude product carries out cooling treatment
Dried, obtains being cooled to the high titanium slag crude product of room temperature.
Compared to prior art, the present invention has the advantages that：
1st, low-temperature reduction of the present invention separates the method that titanium-containing iron ore thing prepares high titanium slag, using pre-oxidation titanium-containing iron ore raw material simultaneously
Addition carbonaceous reducing agent and Na2SO4, the melting and reducing catalyst reduction such as the FeS production pig iron and high titanium slag product, with tradition electricity
Stove smelting titanium slag technique is compared, and can obtain product within 0 ~ 40 minute by reductase 12 under relatively low 1200 ~ 1500 DEG C of temperature environment,
Faster, energy consumption is lower for reduction rate, reduces cost, has reached the purpose of the efficient low-consume low-cost separation pig iron and titanium slag.
2nd, low-temperature reduction of the present invention separates titanium-containing iron ore thing and prepares in the method for high titanium slag, due to Na2SO4, the melting such as FeS
The effect of reducing catalyst realizes the effect of semi-molten reduction in a low temperature of 1200 ~ 1500 DEG C, while also avoid traditional electricity
Stove smelting process must keep the mode of 8% ~ 12% FeO in slag in order to ensure the mobility of slag, therefore to ferrum element
Degree of metalization is higher, also causes the grade of high titanium slag for obtaining higher while the ferrum element response rate is higher.
3rd, low-temperature reduction of the present invention separates titanium-containing iron ore thing and prepares in the method for high titanium slag, can be to reducing and smelting during
The a large amount of CO tail gas for producing in addition recycling, it is further to save reduction heating energy consumption.
4th, low-temperature reduction of the present invention separates the method that titanium-containing iron ore thing prepares high titanium slag, provides one kind to produce high titanium slag
New technology, prepares high titanium slag complex process, low production efficiency, the problems such as with high costs, energy consumption is big in solving prior art.
Description of the drawings
Fig. 1 is the FB(flow block) that low-temperature reduction of the present invention separates that titanium-containing iron ore thing prepares the method for high titanium slag.
Fig. 2 is the exhaust gas component analysis chart reclaimed in the inventive method reduction process.
Fig. 3 is the XRD thing phasors of preparation gained high titanium slag crude product in the embodiment of the present invention one.
Fig. 4 is the SEM scanning figures of preparation gained high titanium slag crude product in the embodiment of the present invention one.
Fig. 5 is the XRD thing phasors of preparation gained high titanium slag crude product in the embodiment of the present invention two.
Specific embodiment
High titanium slag is prepared using electric furnace fusion smelting in being directed to existing process, the flowing of slag is kept using 8 ~ 12% FeO
Property production titanium slag efficiency is low, high energy consumption, cost are big, the problem of complex process, the invention provides a kind of produce the new of high titanium slag
Technique, i.e. low-temperature reduction separate the method that titanium-containing iron ore thing prepares high titanium slag.
Low-temperature reduction of the present invention separate titanium-containing iron ore thing prepare high titanium slag method flow as shown in figure 1, specifically include as
Lower step：
1）Titanium-containing iron ore raw material is carried out into break process, titanium-containing iron ore thing powder is obtained standby.
The titanium-containing iron ore raw material adopted in the step can be ilmenite concentrate, ilmenite, concentrated ilmenite or vanadium titano-magnetite,
And wherein TiO2Content is preferably able to more than 30%, is so more beneficial for so that the grade of gained high titanium slag product is guaranteed.And
On the other hand, in the ilmenite ores powder as obtained by break process, granularity is preferably able to account for gross weight in the granule less than 100 mesh
More than the 80% of amount, is so to be conducive to the TiO in subsequent step in titanium-containing iron ore raw material2And FeO more can fill
It is touched reduction with dividing.
2）Oxidation processes are carried out to titanium-containing iron ore thing powder, titanium-containing iron ore thing powder oxide is obtained.
In titanium-containing iron ore thing, gangue content is more, compact structure, and is mineral intergrowth mostly, and ore beneficiation separates extremely difficult, makes
Obtain after needing molten dividing 8 hours is reduced in electric furnace by more than 1700 DEG C of high temperature into existing titanium-containing iron ore thing smelting process
To high titanium slag product and the pig iron, cause energy consumption higher.This problem is directed to, it is of the invention before being reduced, first to containing ferrotianium
Mineral dust carries out oxidation processes, and the crystal structure that its effect is so that in titanium-containing iron ore thing powder mutually changes with thing, causes
Mineral reduction is made to become easy so as to which reaction activity reduces by more than 25%, so that the later stage is obtained to the temperature of its reduction treatment
It is reduced to reduction, time, lifts reduction reaction efficiency.During concrete operations, preferably, preferably to titanium-containing iron ore thing
Powder carries out oxidation processes in oxidizing atmosphere environment of the temperature for 600 ~ 1100 DEG C, and oxidization time is 20 ~ 80 minutes, and is aoxidized
In atmosphere, oxygen content accounts for more than 20%, to guarantee that oxidation is abundant.
3）Add carbonaceous reducing agent and melting and reducing catalyst in titanium-containing iron ore thing powder oxide, and after mix homogeneously
Pelletizing, obtains compound pelletizing.
During the carbonaceous reducing agent added in the step can adopt coal dust or graphite, and the carbonaceous reducing agent for being added
The molar content of carbon add with the ratio of the molar content of the oxygen in institute's oxides-containing iron in titanium-containing iron ore thing powder preferably 1.1 ~
1.3：1, to guarantee to provide enough reducing agents as the iron content oxidizing component in titanium-containing iron ore thing powder oxide.And melt
Reducing catalyst can adopt Na2SO4Or FeS, and the addition of melting and reducing catalyst is that titanium-containing iron ore thing powder oxide is total
The 2% ~ 12% of quality.The effect of melting and reducing catalyst is that instead of the FeO in traditional handicraft so that final gained slag charge possess compared with
Good mobility, is easy to the separation of impurity；Melting and reducing catalyst can also promote iron granule in reduction process simultaneously
Grow up, be conducive to follow-up magnetic separation, and from the point of view of thermodynamics, the addition of S elements and Na+The addition of ion can be dropped
The fusing point of low ferrum so that slag sluicing system temperature step-down, mobility improve.And to titanium-containing iron ore thing powder oxide, carbonaceous reduction
Agent and melting and reducing catalyst mixing after pelletizing, obtain mixing pelletizing feed, in order to ensure material enter stove reduction can
Possess preferable breathability, lift reduction efficiency, for this purpose, the granularity for mixing pelletizing feed obtained by pelletizing is preferably controlled in 10 ~ 20mm.
4）Compound pelletizing is put in reduction furnace, is reduced at a temperature of 1200 ~ 1500 DEG C, the recovery time is 20
~ 40 minutes, and tail gas is reclaimed in reduction treatment process.
Reduction furnace used in the step can adopt rotary kiln, rotary hearth furnace, fluid bed or shaft furnace, to also in reduction process
Protection against oxidation gas, such as argon, nitrogen etc. are continually fed in former stove, it is therefore an objective to discharge furnace air and prevent from mixing pellet
Group's oxidation by air in reduction process, control reduction in-furnace temperature is under 1200 ~ 1500 DEG C of temperature environment so that containing ferrotianium
TiO in mineral dust2, the simple substance carbon in the oxide and carbonaceous reducing agent such as FeO there is reduction reaction, and due to before this
Pre-oxidation treatment step causes the crystal formation in titanium-containing iron ore thing powder mutually to there occurs change, resulting titanium-containing iron ore thing powder with thing
The reduction of last oxide is very easy to carry out, and under the catalytic action of melting and reducing catalyst, relatively low 1200 ~ 1500
DEG C temperature environment reductase 12 0 ~ 40 minute, reduction temperature is low, the time is short, compared to traditional electric furnace smelting titaniferous iron material
For production high titanium slag, energy consumption is significantly saved.Moreover, in the tail gas product that reduction treatment is obtained in the step, except
Outside the protection against oxidation gas being passed through, component analyses figure in tail gas is mingled with few as shown in Fig. 2 its main component is CO
The CO of amount2Gas, is high value added product, therefore tail gas can be recycled, and as a kind of preferred recovery profit
With mode, the tail gas of recovery can be carried out separating treatment and obtain CO (carbon monoxide converter) gas, to be mixed as Heating Reduction Furnace for Tungsten
The fuel of pellet group reduction is closed, further aid reduces energy consumption and cost.
5）After the completion of reduction, cooling treatment is carried out to the high titanium slag crude product of gained after reduction so that high titanium slag crude product is cooled down
To room temperature.
In the step, the mode that cooling treatment is carried out to high titanium slag crude product can be various ways.For example, can be to also
The high titanium slag crude product of former gained is taken out from stove, and dried is carried out after water quenching cooling, and the high titanium slag for obtaining being cooled to room temperature is thick
Product, the benefit for so processing are to process simple and low cost, but the high titanium slag crude product of high temperature when taking out from stove with once again by
The risk of oxidation.Again for example, the protection against oxidation gas of room temperature, such as argon, nitrogen etc. can be continually fed into into reduction furnace,
Until high titanium slag crude product is cooled to room temperature, its benefit can be that so that high titanium slag crude product furnace cooling, high titanium slag crude product is difficult again
Degree is oxidized, but cost is more of a relatively high.
6）High titanium slag crude product after cooling is carried out into magnetic separation separation after crushing, metallic iron therein is removed, is obtained high titanium
Residue product.
Ferrum element containing reduced metal in resulting high titanium slag crude product, can be separated to metallic iron by magnetic separation
Recycled, magnetic separation clout is then high titanium slag product；Also, due to inventive process avoids traditional electric furnace smelting process
The mode of 8% ~ 12% FeO must be kept in slag in order to ensure the mobility of slag, therefore to the degree of metalization of ferrum element more
Height, also causes the grade of high titanium slag for obtaining higher while the ferrum element response rate is higher.
In general, low-temperature reduction of the invention separates the method that titanium-containing iron ore thing prepares high titanium slag, by first to titaniferous
Iron mineral carries out oxidation pre-treatment so that the crystal structure in titanium-containing iron ore thing powder mutually changes with thing, reaction activity
Reduce, it is easier to be reduced, so as to replace prior art to adopt as reduction furnace using rotary kiln, rotary hearth furnace, fluid bed, shaft furnace etc.
Electric furnace, and by adding carbonaceous reducing agent and Na2SO4, the melting and reducing catalyst such as FeS is to titanium-containing iron ore raw material（Titanium
Concentrate, ilmenite, concentrated ilmenite or vanadium titano-magnetite）0 ~ 40 point of the reductase 12 under relatively low 1200 ~ 1500 DEG C of temperature environment
Clock, then the higher high titanium slag product of grade is obtained through magnetic separation separation and recovery metal ferrum, while can be to reducing and smelting mistake
The a large amount of CO tail gas produced in journey recycling in addition, realizes low energy consumption, efficient high titanium slag preparation technology.
The present invention is described in further detail with instantiation below in conjunction with the accompanying drawings.
Example one：
The present embodiment adopts TiO2Weight/mass percentage composition be 35% ilmenite concentrate as titanium-containing iron ore raw material, graphite as carbonaceous
Reducing agent, Na2SO4As melting and reducing catalyst, high titanium slag is prepared according to the inventive method reduction, comprised the following steps that：
1）Ilmenite concentrate is carried out into break process, obtains that titanium-containing iron ore thing powder is standby, granularity is little in gained ilmenite ores powder
The 83% of gross weight is accounted in the granule of 100 mesh.
2）Titanium-containing iron ore thing powder is put in Muffle furnace and is aoxidized 80 minutes at a temperature of 600 DEG C, obtain titanium-containing iron ore thing
Powder oxide.
3）Add graphite and Na in titanium-containing iron ore thing powder oxide2SO4, wherein, through calculating, the graphite for being added
It is 1.3 that the molar content of middle carbon adds the ratio with the molar content of the oxygen in institute's oxides-containing iron in titanium-containing iron ore thing powder：1, make
For the Na of melting and reducing catalyst2SO4Addition be the 8% of titanium-containing iron ore thing powder oxide gross mass, then mix homogeneously
Pelletizing, obtains granularity for 10 ~ 20mm compound pelletizings afterwards.
4）Compound pelletizing is put in reduction furnace, and argon is continually fed into into reduction furnace as protection against oxidation gas
Body, control reduction in-furnace temperature are reduced 30 minutes at a temperature of 1400 DEG C, and tail gas is reclaimed in reduction treatment process, to returning
The tail gas of receipts obtains CO (carbon monoxide converter) gas to carry out separating treatment, to carry out compound pelletizing reduction as Heating Reduction Furnace for Tungsten
Fuel.
5）After the completion of reduction, the high titanium slag crude product of gained after reduction is taken out to be put in water rapidly from stove carries out water quench cooling
But, dried is carried out after high titanium slag crude product is down to room temperature.Jing things mutually detect, the high titanium slag crude product obtained by the present embodiment
XRD things phasor is as shown in figure 3, its SEM（Scanning Electron Microscope, scanning electron microscope）Scanning figure is such as
Shown in Fig. 4.
6）Magnetic separation separation is carried out after high titanium slag crude product after cooling is carried out crushing under 40 DEG C of environment, gold therein is removed
Category ferrum, obtains high titanium slag product.
Example two：
The present embodiment adopts TiO2Weight/mass percentage composition be 32% ilmenite as titanium-containing iron ore raw material, coal dust as carbonaceous
Reducing agent, FeS prepare high titanium slag according to the inventive method reduction, comprise the following steps that as melting and reducing catalyst：
1）Ilmenite is carried out into break process, obtains that titanium-containing iron ore thing powder is standby, granularity is little in gained ilmenite ores powder
The 85% of gross weight is accounted in the granule of 100 mesh.
2）Titanium-containing iron ore thing powder is put in Muffle furnace and is aoxidized 20 minutes at a temperature of 1100 DEG C, obtain titanium-containing iron ore thing
Powder oxide.
3）Add coal dust and FeS in titanium-containing iron ore thing powder oxide, wherein, through calculating, in the coal dust for being added
It is 1.2 that the molar content of carbon adds the ratio with the molar content of the oxygen in institute's oxides-containing iron in titanium-containing iron ore thing powder：1, as
The addition of the FeS of melting and reducing catalyst is the 4% of titanium-containing iron ore thing powder oxide gross mass, then makes after mix homogeneously
Ball, obtains granularity for 10 ~ 20mm compound pelletizings.
4）Compound pelletizing is put in reduction furnace, and nitrogen is continually fed into into reduction furnace as protection against oxidation gas
Body, control reduction in-furnace temperature are reduced 40 minutes at a temperature of 1300 DEG C, and tail gas is reclaimed in reduction treatment process, to returning
The tail gas of receipts obtains CO (carbon monoxide converter) gas to carry out separating treatment, to carry out compound pelletizing reduction as Heating Reduction Furnace for Tungsten
Fuel.
5）After the completion of reduction, continue the nitrogen of room temperature is continually fed into into reduction furnace, until high titanium slag crude product is cooled to room
Temperature.Jing things mutually detect that the XRD thing phasors of the high titanium slag crude product obtained by the present embodiment are as shown in Figure 5.
6）Magnetic separation separation is carried out after high titanium slag crude product after cooling is carried out crushing under 60 DEG C of environment, gold therein is removed
Category ferrum, obtains high titanium slag product.
Additionally, also having carried out embodiment twice, respectively embodiment three and example IV using the inventive method.Each time real
The major parameter and products therefrom for applying example is as shown in the table.
Can be seen by above-mentioned each embodiment, low-temperature reduction of the present invention separates the method that titanium-containing iron ore thing prepares high titanium slag,
By first carrying out oxidation pre-treatment to titanium-containing iron ore thing so that the reaction activity of titanium-containing iron ore thing is reduced, then in conjunction with carbonaceous
Reducing agent and melting and reducing catalyst, can be prepared under the conditions of lower temperature, by shorter recovery time reduction
High titanium slag, is significantly reduced on energy consumption cost, is solved existing electric furnace smelting process well and is prepared high titanium slag presence
Complex process, low production efficiency, the problems such as with high costs, energy consumption is big, and due to not in the high titanium slag obtained by the method
The FeO contents of holding 8% ~ 12% are needed, thus it is higher to the degree of metalization of ferrum element, and the ferrum element response rate is also made while higher
The grade of the high titanium slag that must be obtained is higher.
In sum, low-temperature reduction of the present invention separates the method that titanium-containing iron ore thing prepares high titanium slag, using pre-oxidation titaniferous
Iron mine raw material simultaneously adds carbonaceous reducing agent and Na2SO4, the melting and reducing catalyst reduction such as the FeS production pig iron and high titanium slag produce
Product, compared with traditional smelting titanium slag with electric stove technique, can under relatively low 1200 ~ 1500 DEG C of temperature environment 0 ~ 40 point of reductase 12
Clock obtains product, and faster, energy consumption is lower for reduction rate, reduces cost, has reached the efficient low-consume low-cost separation pig iron and titanium
The purpose of slag；In its reduction process, due to Na2SO4, the melting and reducing catalyst such as FeS effect realize 1200 ~ 1500 DEG C
The effect of low temperature lower half melting and reducing, at the same also avoid traditional electric furnace smelting process in order to ensure the mobility of slag and must be
The mode of 8% ~ 12% FeO is kept in slag, thus it is higher to the degree of metalization of ferrum element, while the ferrum element response rate is higher
So that the grade of the high titanium slag for obtaining is higher, and the tail gas main component of reduction process is CO, can in addition recycling, enter
The saving reduction heating energy consumption of one step；Thus, the present invention provides a kind of new technology to produce high titanium slag, solves prior art
In prepare high titanium slag complex process, low production efficiency, the problems such as with high costs, energy consumption is big.
Finally illustrate, above example is only unrestricted to illustrate technical scheme, although with reference to compared with
Good embodiment has been described in detail to the present invention, it will be understood by those within the art that, can be to the skill of the present invention
Art scheme is modified or equivalent, and without deviating from the objective and scope of technical solution of the present invention, which all should be covered at this
In the middle of the right of invention.
Claims (10)
1. a kind of low-temperature reduction separates the method that titanium-containing iron ore thing prepares high titanium slag, it is characterised in that comprise the steps：
1）Titanium-containing iron ore raw material is carried out into break process, titanium-containing iron ore thing powder is obtained standby；
2）Oxidation processes are carried out to titanium-containing iron ore thing powder, titanium-containing iron ore thing powder oxide is obtained；
3）Add carbonaceous reducing agent and melting and reducing catalyst in titanium-containing iron ore thing powder oxide, and make after mix homogeneously
Ball, obtains compound pelletizing；
4）Compound pelletizing is put in reduction furnace, and protection against oxidation gas is continually fed into into reduction furnace, 1200 ~ 1500
Reduced at a temperature of DEG C, the recovery time is 20 ~ 40 minutes, and tail gas is reclaimed in reduction treatment process；
5）After the completion of reduction, cooling treatment is carried out to the high titanium slag crude product of gained after reduction so that high titanium slag crude product is cooled to room
Temperature；
6）High titanium slag crude product after cooling is carried out into magnetic separation separation after crushing, metallic iron therein is removed, high titanium slag product is obtained
Product.
2. low-temperature reduction separates the method that titanium-containing iron ore thing prepares high titanium slag according to claim 1, it is characterised in that described
Titanium-containing iron ore raw material is ilmenite concentrate, ilmenite, concentrated ilmenite or vanadium titano-magnetite, and wherein TiO2Weight/mass percentage composition it is big
In 30%.
3. low-temperature reduction separates the method that titanium-containing iron ore thing prepares high titanium slag according to claim 1, it is characterised in that described
Step 1）In, it is desirable in broken gained ilmenite ores powder, granularity accounts for more than the 80% of gross weight in the granule less than 100 mesh.
4. low-temperature reduction separates the method that titanium-containing iron ore thing prepares high titanium slag according to claim 1, it is characterised in that described
Step 2）In, oxidation processes are carried out in oxidizing atmosphere environment of the temperature for 600 ~ 1100 DEG C to titanium-containing iron ore thing powder, is aoxidized
Time is that the volumn concentration of oxygen in 20 ~ 80 minutes, and oxidizing atmosphere environment accounts for more than 20%.
5. low-temperature reduction separates the method that titanium-containing iron ore thing prepares high titanium slag according to claim 1, it is characterised in that described
Step 3）Employed in carbonaceous reducing agent be the carbon in coal dust or graphite, and the carbonaceous reducing agent for being added molar content
Plus with institute's oxides-containing iron in titanium-containing iron ore thing powder in oxygen molar content ratio be 1.1 ~ 1.3：1.
6. low-temperature reduction separates the method that titanium-containing iron ore thing prepares high titanium slag according to claim 1, it is characterised in that described
Step 3）Employed in melting and reducing catalyst be Na2SO4Or FeS, and the addition of melting and reducing catalyst is titanium-containing iron ore
The 2% ~ 12% of thing powder oxide gross mass.
7. low-temperature reduction separates the method that titanium-containing iron ore thing prepares high titanium slag according to claim 1, it is characterised in that described
Step 3）In, the pelletizing granularity of compound pelletizing is 10 ~ 20mm.
8. low-temperature reduction separates the method that titanium-containing iron ore thing prepares high titanium slag according to claim 1, it is characterised in that described
Step 4）In, the tail gas reclaimed during reduction treatment obtains CO (carbon monoxide converter) gas to carry out separating treatment, to make
The fuel of compound pelletizing reduction is carried out for Heating Reduction Furnace for Tungsten.
9. low-temperature reduction separates the method that titanium-containing iron ore thing prepares high titanium slag according to claim 1, it is characterised in that described
Step 5）In, it is that the anti-oxidation of room temperature is continually fed into into reduction furnace to the concrete mode that high titanium slag crude product carries out cooling treatment
Protective gas, until high titanium slag crude product is cooled to room temperature.
10. low-temperature reduction separates the method that titanium-containing iron ore thing prepares high titanium slag according to claim 1, it is characterised in that institute
State step 5）In, to the concrete mode that high titanium slag crude product carries out cooling treatment it is, the high titanium slag crude product water quench cooling to reduction gained
But dried is carried out afterwards, obtains being cooled to the high titanium slag crude product of room temperature.
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| CN111440960A (en) * | 2020-05-27 | 2020-07-24 | 重庆大学 | Preparation method of acid-soluble titanium slag |
| CN113462842A (en) * | 2021-05-31 | 2021-10-01 | 钢研晟华科技股份有限公司 | Method for preparing high-titanium slag powder and metal iron powder by reducing ilmenite concentrate powder at low temperature |
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| CN113462842A (en) * | 2021-05-31 | 2021-10-01 | 钢研晟华科技股份有限公司 | Method for preparing high-titanium slag powder and metal iron powder by reducing ilmenite concentrate powder at low temperature |
| CN113604657A (en) * | 2021-07-06 | 2021-11-05 | 中冶南方都市环保工程技术股份有限公司 | Method for improving metallization rate of reduced products of seaside placer and iron grade of concentrate |
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