CN104986806A - Method and system for preparing carbonyl iron powder by utilizing red mud - Google Patents
Method and system for preparing carbonyl iron powder by utilizing red mud Download PDFInfo
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- CN104986806A CN104986806A CN201510472276.4A CN201510472276A CN104986806A CN 104986806 A CN104986806 A CN 104986806A CN 201510472276 A CN201510472276 A CN 201510472276A CN 104986806 A CN104986806 A CN 104986806A
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Abstract
The invention discloses a method and system for preparing carbonyl iron powder by utilizing red mud. The method comprises the following steps of: (1) mixing red mud, coal and additives to obtain a mixture, and performing pelletization on the mixture so as to obtain a mixed pellets; (2) performing reduction processing on the mixed pellets so as to obtain metalized pellets; (3) performing separation processing on the metalized pellets so as to obtain iron powder and tailings; (4) enabling the iron powder to be in contact with carbon monoxide so as to obtain a gaseous mixture containing carbonyl iron and carbon monoxide; (5) condensing the gaseous mixture containing the carbonyl iron and the carbon monoxide so as to obtain liquid carbonyl iron and first carbon monoxide; and (6) decomposing the liquid carbonyl iron so as to obtain carbonyl iron powder and second carbon monoxide. Through the adoption of the method, the red mud can be effectively utilized, and carbonyl iron powder with a high additional value can be obtained, so that the difficult problems that the industrial wastes, such as red mud, are low in utilization rate and need to be piled and stored for a long time are fundamentally solved.
Description
Technical field
The invention belongs to metallurgical technology field, specifically, the present invention relates to a kind of method and system utilizing red mud to prepare carbonyl iron dust.
Background technology
Red mud produces the main waste produced in alumina process.In general, often produce 1 ton of aluminum oxide and produce 0.8-1.5 ton red mud.Because the composition contained in red mud is many, complex structure, its comprehensive utilization has become a global scientific research difficult problem.At present main with heap save as master, and storing up of red mud not only occupies many soils, consume a large amount of maintenance costs, alkali in red mud can pollute Land Environment, worsen ecotope, and a large amount of valuable metals contained in red mud also can not get sufficient utilization, cause the waste of resource.Along with the attention of exhaustion and people's environmental pollution day by day of Mineral resources, how to greatest extent recycling red mud becomes the research emphasis of relevant scholar.
Summary of the invention
The present invention is intended to solve one of technical problem in correlation technique at least to a certain extent.For this reason, one object of the present invention is to propose a kind of method and system utilizing red mud to prepare carbonyl iron dust, the method can realize effective utilization of red mud, and the carbonyl iron dust of high added value can be obtained, thus fundamentally solve the difficult problem that this trade waste of red mud utilization ratio is low and store up for a long time.
In one aspect of the invention, the present invention proposes a kind of method utilizing red mud to prepare carbonyl iron dust, according to the embodiment of the present invention, the method comprises:
(1) red mud, coal and additive are carried out mixed pelletizing, to obtain mixing pelletizing;
(2) described mixing pelletizing is carried out reduction treatment, to obtain metallized pellet;
(3) described metallized pellet is carried out separating treatment, to obtain iron powder and tailings;
(4) described iron powder is contacted with carbon monoxide, to obtain the gaseous mixture containing iron carbonyl and carbon monoxide;
(5) the described gaseous mixture containing iron carbonyl and carbon monoxide is carried out condensation process, to obtain liquid iron carbonyl and the first carbon monoxide; And
(6) described liquid iron carbonyl is carried out disaggregating treatment, to obtain carbonyl iron dust and the second carbon monoxide respectively.
Thus, effective utilization of red mud can be realized according to the method utilizing red mud to prepare carbonyl iron dust of the embodiment of the present invention, and the carbonyl iron dust of high added value can be obtained, thus fundamentally solve the difficult problem that this trade waste of red mud utilization ratio is low and store up for a long time.
In addition, the method utilizing red mud to prepare carbonyl iron dust according to the above embodiment of the present invention can also have following additional technical characteristic:
In some embodiments of the invention, in step (1), be 100:(20 ~ 50 by described red mud, described coal and described additive according to mass ratio): (5 ~ 15) carry out mixed pelletizing.Thus, the reduction efficiency of follow-up mixing pelletizing can be significantly improved.
In some embodiments of the invention, in step (2), the temperature of described reduction treatment is not less than 1200 degrees Celsius.Thus, the degree of metalization of metallized pellet can be improved further.
In some embodiments of the invention, in step (2), the degree of metalization of described metallized pellet is higher than 90wt%.Thus, carbonyl compound combined coefficient can be significantly improved, and compared with prior art, not need to add catalyzer in iron carbonyl building-up process, thus shorten technical process.
In some embodiments of the invention, in step (3), the particle diameter of described iron powder is not more than 74 microns.Thus, the activity of iron powder can be significantly improved, thus improve iron carbonyl synthesising reacting speed and iron carbonyl synthetic ratio.
In some embodiments of the invention, the described method utilizing red mud to prepare carbonyl iron dust comprises further: described first carbon monoxide is returned step (4) and contacts with described iron powder by (7).Thus, carbon monoxide cycle utilization ratio can be significantly improved.
In some embodiments of the invention, the described method utilizing red mud to prepare carbonyl iron dust comprises further: described second carbon monoxide is returned step (4) and contacts with described iron powder by (8).Thus, carbon monoxide cycle utilization ratio can be improved further.
In another aspect of the present invention, the present invention proposes a kind of system utilizing red mud to prepare carbonyl iron dust, according to embodiments of the invention, this system comprises:
Mixed pelletizing device, described mixed pelletizing device has red mud entrance, coal entrance, additive entrance and the outlet of mixing pelletizing, and is suitable for red mud, coal and additive to carry out mixed pelletizing, to obtain mixing pelletizing;
Reducing apparatus, described reducing apparatus has mixing pelletizing entrance and metallized pellet outlet, and described mixing pelletizing entrance is connected with described mixing pelletizing outlet, and is suitable for described mixing pelletizing to carry out reduction treatment, to obtain metallized pellet;
Tripping device, described tripping device has metallized pellet entrance, iron powder outlet and tailings outlet, and described metallized pellet entrance exports with described metallized pellet and is connected, and is suitable for described metallized pellet to carry out separating treatment, to obtain iron powder and tailings;
Oxo process device, described oxo process device has carbon monoxide inlet, iron powder entrance and gaseous state mixture outlet, described iron powder entrance is connected with described iron powder outlet, and is suitable for described iron powder to contact with carbon monoxide, to obtain the gaseous mixture containing iron carbonyl and carbon monoxide;
Condensing works, described condensing works has gaseous mixture entrance, the outlet of liquid iron carbonyl and the outlet of the first carbon monoxide, described gaseous mixture entrance exports with described gaseous mixture and is connected, and be suitable for the described gaseous mixture containing iron carbonyl and carbon monoxide to carry out condensation process, to obtain liquid iron carbonyl and the first carbon monoxide; And
Decomposer, described decomposer has liquid iron carbonyl entrance, carbonyl iron dust outlet and the outlet of the second carbon monoxide, described liquid iron carbonyl entrance is connected with described liquid iron carbonyl outlet, and be suitable for described liquid iron carbonyl to carry out disaggregating treatment, to obtain carbonyl iron dust and the second carbon monoxide respectively.
Thus, effective utilization of red mud can be realized according to the system utilizing red mud to prepare carbonyl iron dust of the embodiment of the present invention, and the carbonyl iron dust of high added value can be obtained, thus fundamentally solve the difficult problem that this trade waste of red mud utilization ratio is low and store up for a long time.
In addition, the system utilizing red mud to prepare carbonyl iron dust according to the above embodiment of the present invention can also have following additional technical characteristic:
In some embodiments of the invention, described first carbon monoxide outlet is connected with described carbon monoxide inlet, and is suitable for that described first carbon monoxide is back to described oxo process device and contacts with described iron powder.Thus, carbon monoxide cycle utilization ratio can be significantly improved.
In some embodiments of the invention, described second carbon monoxide outlet is connected with described carbon monoxide inlet, and is suitable for that described second carbon monoxide is back to described oxo process device and contacts with described iron powder.Thus, carbon monoxide cycle utilization ratio can be improved further.
Additional aspect of the present invention and advantage will part provide in the following description, and part will become obvious from the following description, or be recognized by practice of the present invention.
Accompanying drawing explanation
Above-mentioned and/or additional aspect of the present invention and advantage will become obvious and easy understand from accompanying drawing below combining to the description of embodiment, wherein:
Fig. 1 is the method flow schematic diagram utilizing red mud to prepare carbonyl iron dust according to an embodiment of the invention;
Fig. 2 prepares the method flow schematic diagram of carbonyl iron dust according to the red mud that utilizes of another embodiment of the present invention;
Fig. 3 prepares the method flow schematic diagram of carbonyl iron dust according to the red mud that utilizes of another embodiment of the present invention;
Fig. 4 is the system architecture schematic diagram utilizing red mud to prepare carbonyl iron dust according to an embodiment of the invention;
Fig. 5 prepares the system architecture schematic diagram of carbonyl iron dust according to the red mud that utilizes of another embodiment of the present invention;
Fig. 6 prepares the system architecture schematic diagram of carbonyl iron dust according to the red mud that utilizes of another embodiment of the present invention.
Embodiment
Be described below in detail embodiments of the invention, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Be exemplary below by the embodiment be described with reference to the drawings, be intended to for explaining the present invention, and can not limitation of the present invention be interpreted as.
In describing the invention, it will be appreciated that, term " " center ", " longitudinal direction ", " transverse direction ", " length ", " width ", " thickness ", " on ", D score, " front ", " afterwards ", " left side ", " right side ", " vertically ", " level ", " top ", " end ", " interior ", " outward ", " clockwise ", " counterclockwise ", " axis ", " radial direction ", orientation or the position relationship of the instruction such as " circumference " are based on orientation shown in the drawings or position relationship, only the present invention for convenience of description and simplified characterization, instead of indicate or imply that the device of indication or element must have specific orientation, with specific azimuth configuration and operation, therefore limitation of the present invention can not be interpreted as.
In addition, term " first ", " second " only for describing object, and can not be interpreted as instruction or hint relative importance or imply the quantity indicating indicated technical characteristic.Thus, be limited with " first ", the feature of " second " can express or impliedly comprise at least one this feature.In describing the invention, the implication of " multiple " is at least two, such as two, three etc., unless otherwise expressly limited specifically.
In the present invention, unless otherwise clearly defined and limited, the term such as term " installation ", " being connected ", " connection ", " fixing " should be interpreted broadly, and such as, can be fixedly connected with, also can be removably connect, or integral; Can be mechanical connection, also can be electrical connection; Can be directly be connected, also indirectly can be connected by intermediary, can be the connection of two element internals or the interaction relationship of two elements, unless otherwise clear and definite restriction.For the ordinary skill in the art, above-mentioned term concrete meaning in the present invention can be understood as the case may be.
In the present invention, unless otherwise clearly defined and limited, fisrt feature second feature " on " or D score can be that the first and second features directly contact, or the first and second features are by intermediary indirect contact.And, fisrt feature second feature " on ", " top " and " above " but fisrt feature directly over second feature or oblique upper, or only represent that fisrt feature level height is higher than second feature.Fisrt feature second feature " under ", " below " and " below " can be fisrt feature immediately below second feature or tiltedly below, or only represent that fisrt feature level height is less than second feature.
In one aspect of the invention, the present invention proposes a kind of method utilizing red mud to prepare carbonyl iron dust.According to embodiments of the invention, the method comprises: red mud, coal and additive are carried out mixed pelletizing by (1), to obtain mixing pelletizing; (2) described mixing pelletizing is carried out reduction treatment, to obtain metallized pellet; (3) described metallized pellet is carried out separating treatment, to obtain iron powder and tailings; (4) described iron powder is contacted with carbon monoxide, to obtain the gaseous mixture containing iron carbonyl and carbon monoxide; (5) the described gaseous mixture containing iron carbonyl and carbon monoxide is carried out condensation process, to obtain liquid iron carbonyl and the first carbon monoxide; And described liquid iron carbonyl is carried out disaggregating treatment by (6), to obtain carbonyl iron dust and the second carbon monoxide respectively.Contriver finds, the method can realize effective utilization of red mud, and adopt red mud as the raw material preparing carbonyl iron dust, significantly can reduce raw materials cost, thus fundamentally solve the difficult problem that this trade waste of red mud utilization ratio is low and store up for a long time, gained carbonyl iron dust grade is higher simultaneously, contact with carbon monoxide additionally by by iron powder thinner for separating treatment gained particle diameter, the two contact area can be significantly improved, thus improve iron carbonyl synthetic ratio, compared with prior art, the present invention does not need to add catalyzer in iron carbonyl building-up process, thus shorten technical process.
The method utilizing red mud to prepare carbonyl iron dust below with reference to Fig. 1-3 pairs of embodiment of the present invention is described in detail.According to embodiments of the invention, the method comprises:
S100: red mud, coal and additive are carried out mixed pelletizing
According to embodiments of the invention, red mud, coal and additive are carried out mixed pelletizing, thus can obtain mixing pelletizing.Contriver finds, adopts red mud as the raw material preparing carbonyl iron dust, significantly can reduce raw materials cost, thus fundamentally solves the difficult problem that red mud this trade waste utilization ratio is low and store up for a long time, and then is that the utilization of resources of red mud opens new way.
According to one embodiment of present invention, the blending ratio of red mud, coal and additive is also not particularly limited, those skilled in the art can select according to actual needs, according to a particular embodiment of the invention, red mud, coal and additive can be 100:(20 ~ 50 according to mass ratio): (5 ~ 15) mix.Contriver finds, coal addition is too low, makes gained metallized pellet degree of metalization in reduction process lower, thus reduce the combined coefficient of iron carbonyl, and if coal too high levels, the technical indicator of carbonyl iron dust not only can not be provided, and coal resource can be caused to waste, improve production cost.Thus, red mud, coal and additive mass ratio is selected to be 100:(20 ~ 50): (5 ~ 15) mix, metallized pellet degree of metalization can be significantly improved, thus make gained iron powder have higher activity, and then promote the synthetic ratio of iron carbonyl, therefore compared with prior art, the present invention does not need to add catalyzer in iron carbonyl building-up process, thus shortens technical process.
According to still a further embodiment, the concrete kind of coal is also not particularly limited, and those skilled in the art can select according to actual needs, and according to a particular embodiment of the invention, coal can adopt high sulphur coal.Contriver finds, simultaneously by adopting high sulphur coal as reductive agent, the ferric oxide that not only can effectively reduce in red mud, and sulphur can be made to enter in iron powder by reduction and separating treatment, namely highly active iron powder is obtained, thus improve the synthetic ratio of iron carbonyl further, and then itself and carbon monoxide are directly contacted can react generation iron carbonyl, and iron carbonyl synthetic ratio is higher, compared with prior art, the present invention does not need to add catalyzer in iron carbonyl building-up process, thus shorten technical process, adopt cheap high sulphur coal as reductive agent in addition, not only effectively can reduce production cost, and sulphur wherein can be made to be applied in iron carbonyl building-up process as beneficiating ingredient, and in iron carbonyl building-up process, do not produce gaseous state sulfur-bearing thing, topsoil can not be caused.
According to still another embodiment of the invention, the particular type of additive is also not particularly limited, those skilled in the art can select according to actual needs, and according to a particular embodiment of the invention, additive can for being selected from least one in alkalimetal oxide, sylvite, calcium salt and sodium salt.Thus, additive, as the fusing assistant of reduction process, significantly can reduce the temperature of reduction process, thus promotes the reduction of iron, utilizes the high efficiente callback of iron.
S200: mixing pelletizing is carried out reduction treatment
According to embodiments of the invention, mixing pelletizing is carried out reduction treatment, thus can metallized pellet be obtained.
According to one embodiment of present invention, the condition of reduction treatment is also not particularly limited, and those skilled in the art can select according to actual needs, and according to a particular embodiment of the invention, reduction treatment just can be carried out being not less than at 1200 DEG C.Contriver finds, a step reduction metallized pellet with higher metal rate can be prepared under this condition, and after gained metallized pellet only needs to carry out simple crushing in subsequent separation process, carry out magnetic separation again and just can realize being separated of iron powder and tailings, and gained iron powder has higher activity, and then promote the synthetic ratio of iron carbonyl speed of reaction and iron carbonyl, therefore compared with prior art, the present invention does not need to add catalyzer in iron carbonyl building-up process, thus shortens technical process.
According to still a further embodiment, the degree of metalization of metallized pellet is higher than 90wt%.Contriver finds, by controlling the degree of metalization of metallized pellet, the iron of metal state can be made to account for total iron ratio increase, thus active higher iron powder can be obtained through later separation, and then promote the synthetic ratio of iron carbonyl further, therefore compared with prior art, the present invention does not need to add catalyzer in iron carbonyl building-up process, thus shortens technical process.
S300: metallized pellet is carried out separating treatment
According to embodiments of the invention, above-mentioned gained metallized pellet is carried out separating treatment, thus can be separated and obtain iron powder and tailings.Concrete, the mode that separating treatment can adopt fragmentation, ore grinding and magnetic separation to combine is carried out to metallized pellet and carries out.
According to one embodiment of present invention, the particle diameter of iron powder is also not particularly limited, and those skilled in the art can select according to actual needs, and according to a particular embodiment of the invention, the particle diameter of iron powder can be not more than 74 microns.Contriver finds, the iron powder under this particle diameter has higher activity, thus promotes the synthetic ratio of follow-up iron carbonyl further, and therefore compared with prior art, the present invention does not need to add catalyzer in iron carbonyl building-up process, thus shortens technical process.
S400: iron powder is contacted with carbon monoxide
According to embodiments of the invention, iron powder is contacted with carbon monoxide, thus the gaseous mixture containing iron carbonyl and carbon monoxide can be obtained.Contriver finds, adopt highly active iron powder and carbon monoxide directly to contact and can react generation iron carbonyl, and iron carbonyl synthetic ratio is higher, compared with prior art, the present invention does not need to add catalyzer in iron carbonyl building-up process, thus shortens technical process.
S500: the gaseous mixture containing iron carbonyl and carbon monoxide is carried out condensation process
According to embodiments of the invention, the gaseous mixture containing iron carbonyl and carbon monoxide is carried out condensation process, thus liquid iron carbonyl and the first carbon monoxide can be obtained.
S600: liquid iron carbonyl is carried out disaggregating treatment
According to embodiments of the invention, liquid iron carbonyl is carried out disaggregating treatment, thus carbonyl iron dust and carbon monoxide can be obtained respectively.Concrete, obtain gaseous state iron carbonyl by after liquid iron carbonyl gasification, because iron carbonyl is unstable, carbonyl iron dust and carbon monoxide can be decomposed into rapidly when heating, thus highly purified carbonyl iron dust can be obtained.
Effective utilization of red mud can be realized according to the method utilizing red mud to prepare carbonyl iron dust of the embodiment of the present invention, and adopt red mud as the raw material preparing carbonyl iron dust, significantly can reduce raw materials cost, thus fundamentally solve the difficult problem that this trade waste of red mud utilization ratio is low and store up for a long time, gained carbonyl iron dust grade is higher simultaneously, additionally by the control degree of metalization of metallized pellet and the particle diameter of gained iron powder, the iron powder making particle diameter thinner and carbon monoxide directly contact and can generate iron carbonyl, thus improve iron carbonyl synthetic ratio, compared with prior art, the present invention does not need to add catalyzer in iron carbonyl building-up process, thus shorten technical process.
With reference to figure 2, the method utilizing red mud to prepare carbonyl iron dust of the embodiment of the present invention comprises further:
S700: the first carbon monoxide is returned S400 and contacts with iron powder
According to embodiments of the invention, S500 condensation separation gained first carbon monoxide is back to S400 and contacts with iron powder, thus carbon monoxide cycle utilization ratio can be significantly improved.
With reference to figure 3, the method utilizing red mud to prepare carbonyl iron dust of the embodiment of the present invention comprises further:
S800: the second carbon monoxide is returned S400 and contacts with iron powder
According to embodiments of the invention, S600 is decomposed gained second carbon monoxide and be back to S400 and contact with iron powder, thus carbon monoxide cycle utilization ratio can be improved further.
In another aspect of the present invention, the present invention proposes a kind of system utilizing red mud to prepare carbonyl iron dust.According to embodiments of the invention, this system comprises: mixed pelletizing device, described mixed pelletizing device has red mud entrance, coal entrance, additive entrance and the outlet of mixing pelletizing, and is suitable for red mud, coal and additive to carry out mixed pelletizing, to obtain mixing pelletizing; Reducing apparatus, described reducing apparatus has mixing pelletizing entrance and metallized pellet outlet, and described mixing pelletizing entrance is connected with described mixing pelletizing outlet, and is suitable for described mixing pelletizing to carry out reduction treatment, to obtain metallized pellet; Tripping device, described tripping device has metallized pellet entrance, iron powder outlet and tailings outlet, and described metallized pellet entrance exports with described metallized pellet and is connected, and is suitable for described metallized pellet to carry out separating treatment, to obtain iron powder and tailings; Oxo process device, described oxo process device has carbon monoxide inlet, iron powder entrance and gaseous state mixture outlet, described iron powder entrance is connected with described iron powder outlet, and is suitable for described iron powder to contact with carbon monoxide, to obtain the gaseous mixture containing iron carbonyl and carbon monoxide; Condensing works, described condensing works has gaseous mixture entrance, the outlet of liquid iron carbonyl and the outlet of the first carbon monoxide, described gaseous mixture entrance exports with described gaseous mixture and is connected, and be suitable for the described gaseous mixture containing iron carbonyl and carbon monoxide to carry out condensation process, to obtain liquid iron carbonyl and the first carbon monoxide; And decomposer, described decomposer has liquid iron carbonyl entrance, carbonyl iron dust outlet and the outlet of the second carbon monoxide, described liquid iron carbonyl entrance is connected with described liquid iron carbonyl outlet, and be suitable for described liquid iron carbonyl to carry out disaggregating treatment, to obtain carbonyl iron dust and the second carbon monoxide respectively.Contriver finds, this system can realize effective utilization of red mud, and adopt red mud as the raw material preparing carbonyl iron dust, significantly can reduce raw materials cost, thus fundamentally solve the difficult problem that this trade waste of red mud utilization ratio is low and store up for a long time, gained carbonyl iron dust grade is higher simultaneously, contact with carbon monoxide additionally by by iron powder thinner for separating treatment gained particle diameter, the two contact area can be significantly improved, thus improve iron carbonyl synthetic ratio, compared with prior art, the present invention does not need to add catalyzer in iron carbonyl building-up process, thus shorten technical process.
The system utilizing red mud to prepare carbonyl iron dust below with reference to Fig. 4-6 pairs of embodiment of the present invention is described in detail.According to embodiments of the invention, this system comprises:
Mixed pelletizing device 100: according to embodiments of the invention, mixed pelletizing device 100 has red mud entrance 101, coal entrance 102, additive entrance 103 and mixing pelletizing outlet 104, and be suitable for red mud, coal and additive to carry out mixed pelletizing, thus can obtain mixing pelletizing.Contriver finds, adopts red mud as the raw material preparing carbonyl iron dust, significantly can reduce raw materials cost, thus fundamentally solves the difficult problem that red mud this trade waste utilization ratio is low and store up for a long time, and then is that the utilization of resources of red mud opens new way.
According to one embodiment of present invention, the blending ratio of red mud, coal and additive is also not particularly limited, those skilled in the art can select according to actual needs, according to a particular embodiment of the invention, red mud, coal and additive can be 100:(20 ~ 50 according to mass ratio): (5 ~ 15) mix.Contriver finds, coal addition is too low, makes gained metallized pellet degree of metalization in reduction process lower, thus reduce the combined coefficient of iron carbonyl, and if coal too high levels, the technical indicator of carbonyl iron dust not only can not be provided, and coal resource can be caused to waste, improve production cost.Thus, red mud, coal and additive mass ratio is selected to be 100:(20 ~ 50): (5 ~ 15) mix, metallized pellet degree of metalization can be significantly improved, thus make gained iron powder have higher activity, and then promote the synthetic ratio of iron carbonyl, therefore compared with prior art, the present invention does not need to add catalyzer in iron carbonyl building-up process, thus shortens technical process.
According to still a further embodiment, the concrete kind of coal is also not particularly limited, and those skilled in the art can select according to actual needs, and according to a particular embodiment of the invention, coal can adopt high sulphur coal.Contriver finds, simultaneously by adopting high sulphur coal as reductive agent, the ferric oxide that not only can effectively reduce in red mud, and sulphur can be made to enter in iron powder by reduction and separating treatment, namely highly active iron powder is obtained, thus improve building-up reactions speed and the iron carbonyl synthetic ratio of iron carbonyl further, and then itself and carbon monoxide are directly contacted can react generation iron carbonyl, and iron carbonyl synthetic ratio is higher, compared with prior art, the present invention does not need to add catalyzer in iron carbonyl building-up process, thus shorten technical process, adopt cheap high sulphur coal as reductive agent in addition, not only effectively can reduce production cost, and sulphur wherein can be made to be applied in iron carbonyl building-up process as beneficiating ingredient, and in iron carbonyl building-up process, do not produce gaseous state sulfur-bearing thing, topsoil can not be caused.
According to still another embodiment of the invention, the particular type of additive is also not particularly limited, those skilled in the art can select according to actual needs, and according to a particular embodiment of the invention, additive can for being selected from least one in alkalimetal oxide, sylvite and sodium salt.Thus, additive, as the fusing assistant of reduction process, significantly can reduce the temperature of reduction process, thus promotes the reduction of iron.
Reducing apparatus 200: according to embodiments of the invention, reducing apparatus 200 has mixing pelletizing entrance 201 and metallized pellet outlet 202, mixing pelletizing entrance 201 is connected with mixing pelletizing outlet 104, and is suitable for mixing pelletizing to carry out reduction treatment, thus can obtain metallized pellet.
According to one embodiment of present invention, the condition of reduction treatment is also not particularly limited, and those skilled in the art can select according to actual needs, and according to a particular embodiment of the invention, reduction treatment just can be carried out being not less than at 1200 DEG C.Contriver finds, a step reduction metallized pellet with higher metal rate can be prepared under this condition, and after gained metallized pellet only needs to carry out simple crushing in subsequent separation process, carry out magnetic separation again and just can realize being separated of iron powder and tailings, and gained iron powder has higher activity, and then promote the synthetic ratio of iron carbonyl, therefore compared with prior art, the present invention does not need to add catalyzer in iron carbonyl building-up process, thus shortens technical process.
According to still a further embodiment, the degree of metalization of metallized pellet is higher than 90wt%.Contriver finds, by controlling the degree of metalization of metallized pellet, the iron of metal state can be made to account for total iron ratio increase, thus active higher iron powder can be obtained through later separation, and then promote the synthetic ratio of iron carbonyl further, therefore compared with prior art, the present invention does not need to add catalyzer in iron carbonyl building-up process, thus shortens technical process.
Tripping device 300: according to embodiments of the invention, tripping device 300 has metallized pellet entrance 301, iron powder outlet 302 and tailings outlet 303, metallized pellet entrance 301 and metallized pellet export 202 and are connected, and be suitable for above-mentioned gained metallized pellet to carry out separating treatment, thus can be separated and obtain iron powder and tailings.Concrete, the mode that separating treatment can adopt fragmentation, ore grinding and magnetic separation to combine is carried out to metallized pellet and carries out.
According to one embodiment of present invention, the particle diameter of iron powder is also not particularly limited, and those skilled in the art can select according to actual needs, and according to a particular embodiment of the invention, the particle diameter of iron powder can be not more than 74 microns.Contriver finds, the iron powder under this particle diameter has higher activity, thus promotes the synthetic ratio of follow-up iron carbonyl further, and therefore compared with prior art, the present invention does not need to add catalyzer in iron carbonyl building-up process, thus shortens technical process.
Oxo process device 400: according to embodiments of the invention, oxo process device 400 has carbon monoxide inlet 401, iron powder entrance 402 and gaseous state mixture outlet 403, iron powder entrance 402 is connected with iron powder outlet 302, and be suitable for iron powder to contact with carbon monoxide, thus the gaseous mixture containing iron carbonyl and carbon monoxide can be obtained.Contriver finds, adopt highly active iron powder and carbon monoxide directly to contact and can react generation iron carbonyl, and iron carbonyl synthetic ratio is higher, compared with prior art, the present invention does not need to add catalyzer in iron carbonyl building-up process, thus shortens technical process.
Condensing works 500: according to embodiments of the invention, condensing works 500 has gaseous mixture entrance 501, liquid iron carbonyl outlet 502, gaseous mixture entrance 501 and gaseous mixture export 403 and are connected, and be suitable for the gaseous mixture containing iron carbonyl and carbon monoxide to carry out condensation process, thus liquid iron carbonyl and the second carbon monoxide can be obtained.
Decomposer 600: according to embodiments of the invention, decomposer 600 has liquid iron carbonyl entrance 601, carbonyl iron dust outlet 602 and the second carbon monoxide outlet 603, liquid iron carbonyl entrance 601 is connected with liquid iron carbonyl outlet 502, and be suitable for liquid iron carbonyl to carry out disaggregating treatment, thus carbonyl iron dust and the second carbon monoxide can be obtained respectively.Concrete, iron carbonyl is unstable, can be decomposed into rapidly carbonyl iron dust and carbon monoxide, thus can obtain highly purified carbonyl iron dust when heating.
Effective utilization of red mud can be realized according to the system utilizing red mud to prepare carbonyl iron dust of the embodiment of the present invention, and adopt red mud as the raw material preparing carbonyl iron dust, significantly can reduce raw materials cost, thus fundamentally solve the difficult problem that this trade waste of red mud utilization ratio is low and store up for a long time, gained carbonyl iron dust grade is higher simultaneously, additionally by the control degree of metalization of metallized pellet and the particle diameter of gained iron powder, the iron powder making particle diameter thinner and carbon monoxide directly contact and can generate iron carbonyl, thus improve iron carbonyl synthetic ratio, compared with prior art, the present invention does not need to add catalyzer in iron carbonyl building-up process, thus shorten technical process.
With reference to figure 5, according to embodiments of the invention, the first carbon monoxide outlet 503 is connected with carbon monoxide inlet 401, and is suitable for separating obtained for condensing works 500 first carbon monoxide to be back in oxo process device 400 to continue to react with iron powder.Thus, carbon monoxide cycle utilization ratio can be significantly improved.
With reference to figure 6, according to embodiments of the invention, the second carbon monoxide outlet 603 is connected with carbon monoxide inlet 401, and is suitable for decomposer 600 to decompose the second carbon monoxide obtained and returns oxo process device 400 and contact with iron powder and continue to react.Thus, carbon monoxide cycle utilization ratio can be improved further.
Below with reference to specific embodiment, present invention is described, it should be noted that, these embodiments are only descriptive, and do not limit the present invention in any way.
Embodiment 1
By red mud, coal, ball processed after calcium oxide mixing is also dried, wherein, red mud, the mixing quality of coal and calcium oxide is than being 100:25:10, dried mixing pelletizing reduces at 1220 DEG C, obtain metallized pellet (degree of metalization 92wt%, pelletizing surface is in micro-melting phenomenon), then by gained metallized pellet through fragmentation, ore grinding is separated with magnetic separation, obtain median size lower than the iron powder of 74 microns, then iron powder and CO counter current contact generation oxonation are generated the gaseous mixture containing iron carbonyl and carbon monoxide, gaseous mixture containing iron carbonyl gaseous state and carbon monoxide is carried out condensation process, obtain liquid iron carbonyl and carbon monoxide, carbon monoxide is returned to contact with iron powder and continue to react, finally carry out disaggregating treatment again by after the liquid iron carbonyl gasification obtained, obtain the carbonyl iron dust that Iron grade is 99.2wt%.
Embodiment 2
By red mud, coal, ball processed after Wingdale mixing is also dried, wherein, red mud, the mixing quality of coal and Wingdale is than being 100:35:15, dried mixing pelletizing reduces at 1250 DEG C, obtain metallized pellet (degree of metalization 90.5wt%, pelletizing surface is in micro-melting phenomenon), then by gained metallized pellet through fragmentation, ore grinding is separated with magnetic separation, obtain median size lower than the iron powder of 74 microns, then iron powder and CO counter current contact generation oxonation are generated the gaseous mixture containing iron carbonyl and carbon monoxide, gaseous mixture containing iron carbonyl gaseous state and carbon monoxide is carried out condensation process, obtain liquid iron carbonyl and carbon monoxide, carbon monoxide is returned to contact with iron powder and continue to react, finally carry out disaggregating treatment again by after the liquid iron carbonyl gasification obtained, obtain the carbonyl iron dust that Iron grade is 99.3wt%.
In the description of this specification sheets, specific features, structure, material or feature that the description of reference term " embodiment ", " some embodiments ", " example ", " concrete example " or " some examples " etc. means to describe in conjunction with this embodiment or example are contained at least one embodiment of the present invention or example.In this manual, to the schematic representation of above-mentioned term not must for be identical embodiment or example.And the specific features of description, structure, material or feature can combine in one or more embodiment in office or example in an appropriate manner.In addition, when not conflicting, the feature of the different embodiment described in this specification sheets or example and different embodiment or example can carry out combining and combining by those skilled in the art.
Although illustrate and describe embodiments of the invention above, be understandable that, above-described embodiment is exemplary, can not be interpreted as limitation of the present invention, and those of ordinary skill in the art can change above-described embodiment within the scope of the invention, revises, replace and modification.
Claims (10)
1. utilize red mud to prepare a method for carbonyl iron dust, it is characterized in that, comprising:
(1) red mud, coal and additive are carried out mixed pelletizing, to obtain mixing pelletizing;
(2) described mixing pelletizing is carried out reduction treatment, to obtain metallized pellet;
(3) described metallized pellet is carried out separating treatment, to obtain iron powder and tailings;
(4) described iron powder is contacted with carbon monoxide, to obtain the gaseous mixture containing iron carbonyl and carbon monoxide;
(5) the described gaseous mixture containing iron carbonyl and carbon monoxide is carried out condensation process, to obtain liquid iron carbonyl and the first carbon monoxide; And
(6) described liquid iron carbonyl is carried out disaggregating treatment, to obtain carbonyl iron dust and the second carbon monoxide respectively.
2. method according to claim 1, is characterized in that, in step (1), is 100:(20 ~ 50 by described red mud, described coal and described additive according to mass ratio): (5 ~ 15) carry out mixed pelletizing.
3. method according to claim 1, is characterized in that, in step (2), the temperature of described reduction treatment is not less than 1200 degrees Celsius.
4. method according to claim 3, is characterized in that, in step (2), the degree of metalization of described metallized pellet is higher than 90wt%.
5. method according to claim 1, is characterized in that, in step (3), the particle diameter of described iron powder is not more than 74 microns.
6. method according to claim 1, is characterized in that, comprises further:
(7) described first carbon monoxide is returned step (4) to contact with described iron powder.
7. method according to claim 1, is characterized in that, comprises further:
(8) described second carbon monoxide is returned step (4) to contact with described iron powder.
8. utilize red mud to prepare a system for carbonyl iron dust, it is characterized in that, comprising:
Mixed pelletizing device, described mixed pelletizing device has red mud entrance, coal entrance, additive entrance and the outlet of mixing pelletizing, and is suitable for red mud, coal and additive to carry out mixed pelletizing, to obtain mixing pelletizing;
Reducing apparatus, described reducing apparatus has mixing pelletizing entrance and metallized pellet outlet, and described mixing pelletizing entrance is connected with described mixing pelletizing outlet, and is suitable for described mixing pelletizing to carry out reduction treatment, to obtain metallized pellet;
Tripping device, described tripping device has metallized pellet entrance, iron powder outlet and tailings outlet, and described metallized pellet entrance exports with described metallized pellet and is connected, and is suitable for described metallized pellet to carry out separating treatment, to obtain iron powder and tailings;
Oxo process device, described oxo process device has carbon monoxide inlet, iron powder entrance and gaseous state mixture outlet, described iron powder entrance is connected with described iron powder outlet, and is suitable for described iron powder to contact with carbon monoxide, to obtain the gaseous mixture containing iron carbonyl and carbon monoxide;
Condensing works, described condensing works has gaseous mixture entrance, the outlet of liquid iron carbonyl and the outlet of the first carbon monoxide, described gaseous mixture entrance exports with described gaseous mixture and is connected, and be suitable for the described gaseous mixture containing iron carbonyl and carbon monoxide to carry out condensation process, to obtain liquid iron carbonyl and the first carbon monoxide; And
Decomposer, described decomposer has liquid iron carbonyl entrance, carbonyl iron dust outlet and the outlet of the second carbon monoxide, described liquid iron carbonyl entrance is connected with described liquid iron carbonyl outlet, and be suitable for described liquid iron carbonyl to carry out disaggregating treatment, to obtain carbonyl iron dust and the second carbon monoxide respectively.
9. system according to claim 8, is characterized in that, described first carbon monoxide outlet is connected with described carbon monoxide inlet, and is suitable for that described first carbon monoxide is back to described oxo process device and contacts with described iron powder.
10. system according to claim 8, is characterized in that, described second carbon monoxide outlet is connected with described carbon monoxide inlet, and is suitable for that described second carbon monoxide is back to described oxo process device and contacts with described iron powder.
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