CN113832280A - Method and apparatus for producing reduced ilmenite - Google Patents
Method and apparatus for producing reduced ilmenite Download PDFInfo
- Publication number
- CN113832280A CN113832280A CN202111021659.1A CN202111021659A CN113832280A CN 113832280 A CN113832280 A CN 113832280A CN 202111021659 A CN202111021659 A CN 202111021659A CN 113832280 A CN113832280 A CN 113832280A
- Authority
- CN
- China
- Prior art keywords
- furnace
- ilmenite
- oxidation
- reducing gas
- reduction
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- YDZQQRWRVYGNER-UHFFFAOYSA-N iron;titanium;trihydrate Chemical compound O.O.O.[Ti].[Fe] YDZQQRWRVYGNER-UHFFFAOYSA-N 0.000 title claims abstract description 193
- 238000000034 method Methods 0.000 title claims description 39
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 130
- 230000003647 oxidation Effects 0.000 claims abstract description 120
- 230000009467 reduction Effects 0.000 claims abstract description 119
- 239000002994 raw material Substances 0.000 claims abstract description 93
- 238000002309 gasification Methods 0.000 claims abstract description 86
- 239000003245 coal Substances 0.000 claims abstract description 44
- 238000002360 preparation method Methods 0.000 claims abstract description 10
- 239000007789 gas Substances 0.000 claims description 132
- 239000002245 particle Substances 0.000 claims description 36
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 21
- 239000007787 solid Substances 0.000 claims description 19
- 230000035484 reaction time Effects 0.000 claims description 17
- 238000000926 separation method Methods 0.000 claims description 17
- 239000001257 hydrogen Substances 0.000 claims description 14
- 229910052739 hydrogen Inorganic materials 0.000 claims description 14
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 12
- 230000001590 oxidative effect Effects 0.000 claims description 12
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 11
- 239000001301 oxygen Substances 0.000 claims description 11
- 229910052760 oxygen Inorganic materials 0.000 claims description 11
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 10
- 238000004519 manufacturing process Methods 0.000 claims description 9
- 239000004408 titanium dioxide Substances 0.000 claims description 9
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 8
- 229910002091 carbon monoxide Inorganic materials 0.000 claims description 8
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 6
- 239000001569 carbon dioxide Substances 0.000 claims description 6
- 239000000126 substance Substances 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 150000002431 hydrogen Chemical class 0.000 claims description 4
- 239000012535 impurity Substances 0.000 abstract description 7
- 238000003889 chemical engineering Methods 0.000 abstract description 2
- 238000006722 reduction reaction Methods 0.000 description 117
- 239000000463 material Substances 0.000 description 14
- 238000006243 chemical reaction Methods 0.000 description 13
- 230000008569 process Effects 0.000 description 11
- 238000010586 diagram Methods 0.000 description 7
- 238000005265 energy consumption Methods 0.000 description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 230000009471 action Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000009257 reactivity Effects 0.000 description 4
- 239000003638 chemical reducing agent Substances 0.000 description 3
- 238000007599 discharging Methods 0.000 description 3
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000010936 titanium Substances 0.000 description 2
- 229910052719 titanium Inorganic materials 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 229910005451 FeTiO3 Inorganic materials 0.000 description 1
- JTCFNJXQEFODHE-UHFFFAOYSA-N [Ca].[Ti] Chemical compound [Ca].[Ti] JTCFNJXQEFODHE-UHFFFAOYSA-N 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 239000012634 fragment Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000007885 magnetic separation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052592 oxide mineral Inorganic materials 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000011946 reduction process Methods 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/0073—Selection or treatment of the reducing gases
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/0046—Making spongy iron or liquid steel, by direct processes making metallised agglomerates or iron oxide
-
- 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
- C22B34/1218—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 obtaining titanium or titanium compounds from ores or scrap by dry processes
- C22B34/1227—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 obtaining titanium or titanium compounds from ores or scrap by dry processes using an oxygen containing agent
-
- 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
- C22B5/00—General methods of reducing to metals
- C22B5/02—Dry methods smelting of sulfides or formation of mattes
- C22B5/12—Dry methods smelting of sulfides or formation of mattes by gases
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The present disclosure provides a preparation method and a device of reduced ilmenite, which relates to the technical field of chemical engineering, and the preparation method of the reduced ilmenite comprises: raw material coal is input into a gasification furnace to be gasified to generate reducing gas, and the reducing gas is input into an oxidation furnace and a reduction furnace; combusting the reducing gas input by the gasification furnace in the oxidation furnace to oxidize ilmenite raw materials to generate oxidized ilmenite, and inputting the oxidized ilmenite into the reduction furnace; and reducing the oxidized ilmenite input by the oxidation furnace in the reduction furnace through the reducing gas input by the gasification furnace to generate reduced ilmenite. Therefore, the reduced ilmenite is prepared by replacing the raw material coal with the reducing gas and replacing the ilmenite raw material with the oxidized ilmenite, so that the direct contact between the raw material coal and the ilmenite raw material is avoided, the impurities in the generated reduced ilmenite are reduced, and the problem of poor quality of the reduced ilmenite is solved.
Description
Technical Field
The disclosure relates to the technical field of chemical engineering, in particular to a preparation method and a device for reducing ilmenite.
Background
Ilmenite, also called titanomagnetite, is an oxide mineral of iron and titanium, the main component of which is FeTiO3The reduced ilmenite generated after reduction reaction of ilmenite has the advantages of good reducibility, stable and soft electric arc, good slag coverage and the like, and is the main raw material of the titanium-calcium type welding rod material.
The traditional production process of reducing ilmenite mainly comprises a tunnel kiln and a rotary kiln process, and the main process is that natural ilmenite and reducing agents such as coal and the like are added into a kiln according to a certain proportion, so that the natural ilmenite and the reducing agents are subjected to reduction reaction under a certain reaction condition, and the reduced ilmenite is obtained through magnetic separation. However, in the above reaction process, the direct contact reaction of coal and ilmenite results in a large amount of impurities such as coal and the like being included in the reduced ilmenite produced, which affects the quality of the reduced ilmenite produced.
Disclosure of Invention
In order to reduce impurities in the produced reduced ilmenite and improve the quality of the reduced ilmenite, the present disclosure provides a method and apparatus for producing reduced ilmenite.
In order to achieve the above purpose, the technical solutions provided by the embodiments of the present invention are as follows:
in a first aspect, embodiments of the present disclosure provide a method for preparing reduced ilmenite, the method including: feeding raw material coal into a gasification furnace for gasification to generate reducing gas, and feeding the reducing gas into an oxidation furnace and a reduction furnace;
combusting the reducing gas input by the gasification furnace in the oxidation furnace to oxidize ilmenite raw materials to generate oxidized ilmenite, and inputting the oxidized ilmenite into the reduction furnace;
and reducing the oxidized ilmenite input by the oxidation furnace in the reduction furnace through the reducing gas input by the gasification furnace to generate reduced ilmenite.
As an optional implementation manner of the embodiment of the present invention, the method further includes:
and inputting tail gas generated by the oxidation furnace into the gasification furnace.
As an optional implementation mode of the embodiment of the invention, the temperature of the gasification furnace is [800 ℃, 1000 ℃), and the particle size of the raw material coal is [1mm, 6mm ].
As an optional implementation manner of the embodiment of the present invention, the reducing gas includes: hydrogen, and the volume fraction of the hydrogen belongs to [ 60%, 80% ].
As an alternative implementation of the embodiment of the present invention, the component content of the gas in the oxidation furnace satisfies the following relation:
wherein the content of the first and second substances,
VCOrespectively the volumes of carbon dioxide, oxygen, water vapor, hydrogen and carbon monoxide in the oxidation furnace.
As an optional implementation mode of the embodiment of the invention, the particle size of the ilmenite raw material is [0.3mm, 1mm ], the mass fraction of titanium dioxide in the ilmenite raw material is not lower than 40%, the temperature of the oxidation furnace is [950 ℃, 1050 ℃), and the first reaction time is [0.5h, 1h ];
wherein the first reaction time is the time for oxidizing ilmenite raw materials to generate oxidized ilmenite by combusting the reducing gas input by the gasification furnace in the oxidation furnace.
As an alternative implementation of the embodiment of the present invention, the composition content of the gas in the reduction furnace satisfies the following relation:
wherein the content of the first and second substances,
VCOthe volumes of carbon dioxide, oxygen, water vapor, hydrogen and carbon monoxide in the reduction furnace are respectively.
As an optional implementation manner of the embodiment of the invention, the temperature of the reduction furnace is [900 ℃, 1000 ℃), and the second reaction time is [1h, 2h ];
wherein the second reaction time is a time for reducing the oxidized ilmenite input by the oxidation furnace through the reducing gas input by the gasification furnace in the reduction furnace to generate the reduced ilmenite.
As an alternative embodiment of the present invention, before the reducing gas is introduced into the oxidizing furnace and the reducing furnace, the method further comprises:
separating solid particles in the reducing gas through a cyclone separation device, inputting the reducing gas after the solid particles are separated into the oxidation furnace and the reduction furnace, and returning the solid particles to the gasification furnace.
In a second aspect, embodiments of the present disclosure provide a production apparatus for reducing ilmenite, including: a gasification furnace, an oxidation furnace and a reduction furnace;
the gasification furnace is respectively communicated with the oxidation furnace and the reduction furnace and is used for gasifying input raw material coal to generate reducing gas and inputting the reducing gas into the oxidation furnace and the reduction furnace;
the oxidation furnace is communicated with the reduction furnace and is used for combusting the reducing gas input by the gasification furnace to oxidize ilmenite raw materials to generate oxidized ilmenite and inputting the oxidized ilmenite into the reduction furnace;
the reduction furnace is used for reducing the oxidized ilmenite input by the oxidation furnace through the reducing gas input by the gasification furnace to generate reduced ilmenite.
According to the preparation method of the reduced ilmenite, the raw material coal is input into the gasification furnace to be gasified to generate the reducing gas, and the reducing gas is input into the oxidation furnace and the reduction furnace; combusting the reducing gas input by the gasification furnace in the oxidation furnace to oxidize ilmenite raw materials to generate oxidized ilmenite, and inputting the oxidized ilmenite into the reduction furnace; and reducing the oxidized ilmenite input by the oxidation furnace in the reduction furnace through the reducing gas input by the gasification furnace to generate reduced ilmenite. In the embodiment of the disclosure, the ilmenite raw material is oxidized in the oxidation furnace to generate oxidized ilmenite with better reactivity than the ilmenite raw material, the oxidized ilmenite is input into the reduction furnace, and the reducing gas generated by gasifying the raw material coal in the gasification furnace is introduced into the reduction furnace to reduce the oxidized ilmenite, so that the effect of reducing the oxidized ilmenite by replacing the raw material coal with the reducing gas is achieved. Because the oxidized ilmenite has better reactivity than the ilmenite raw material, the preparation efficiency of the reduced ilmenite can be improved by oxidizing and then reducing the ilmenite raw material, and the direct contact between the raw material coal and the oxidized ilmenite can be avoided by reducing the oxidized ilmenite with the reducing gas generated after the gasification reaction of the raw material coal, so that the raw material coal and the impurity elements contained in the raw material coal can be effectively prevented from being mixed into the generated reduced ilmenite, and the quality of the reduced ilmenite can be improved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure.
In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present disclosure, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.
FIG. 1 is a flow diagram of the steps of a process for producing reduced ilmenite provided in an embodiment of the present disclosure;
FIG. 2 is a schematic block diagram of a reduced ilmenite manufacturing apparatus provided by an embodiment of the present disclosure;
FIG. 3 is a schematic configuration diagram of a reduced ilmenite manufacturing apparatus provided by another embodiment of the present disclosure;
FIG. 4 is a schematic configuration diagram of a production apparatus for reducing ilmenite provided by yet another embodiment of the present disclosure;
fig. 5 is a schematic structural view of a reduced ilmenite manufacturing apparatus provided in yet another embodiment of the present disclosure.
Detailed Description
In order that the above objects, features and advantages of the present disclosure may be more clearly understood, aspects of the present disclosure will be further described below. It should be noted that the embodiments and features of the embodiments of the present disclosure may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present disclosure, but the present disclosure may be practiced in other ways than those described herein; it is to be understood that the embodiments disclosed in the specification are only a few embodiments of the present disclosure, and not all embodiments.
In the disclosed embodiments, words such as "exemplary" or "for example" are used to mean serving as an example, instance, or illustration. Any embodiment or design described as "exemplary" or "e.g.," in an embodiment of the present disclosure is not to be construed as preferred or advantageous over other embodiments or designs. Rather, use of the word "exemplary" or "such as" is intended to present concepts related in a concrete fashion.
An embodiment of the present disclosure provides a method for preparing reduced ilmenite, and referring to fig. 1, fig. 1 is a flow chart of a method for preparing reduced ilmenite according to an embodiment of the present disclosure, which includes the following steps S110 to S130, and as shown in fig. 2, steps S110 to S130 shown in fig. 1 can be implemented by the apparatus for preparing reduced ilmenite shown in fig. 2.
The production apparatus for reducing ilmenite shown in fig. 2 includes: an oxidation furnace 201, a gasification furnace 202, and a reduction furnace 203; the gasification furnace 202 is respectively communicated with the oxidation furnace 201 and the reduction furnace 203, and is used for gasifying the raw material gas into a reducing gas and inputting the reducing gas into the oxidation furnace 201 and the reduction furnace 203; the oxidation furnace 201 is communicated with the reduction furnace 203 and is used for oxidizing ilmenite raw materials into oxidized ilmenite and inputting the oxidized ilmenite into the reduction furnace 203; the reduction furnace 203 is used for reducing the oxidized ilmenite input by the oxidation furnace through the reducing gas input by the gasification furnace to generate reduced ilmenite.
S110, feeding the raw material coal into a gasification furnace for gasification to generate reducing gas, and feeding the reducing gas into an oxidation furnace and a reduction furnace.
Optionally, the temperature of the gasification furnace is [800 ℃, 1000 ℃), and the particle size of the raw material coal is [1mm, 6mm ].
Specifically, the temperature of the gasification furnace is the temperature at which the raw coal undergoes a gasification reaction, and the particle size of the raw coal is used to indicate the size of the raw coal fragments. The reason why the particle size of the raw material coal is 1mm, 6mm is that if the particle size of the raw material coal is less than 1mm, the pulverized coal of the raw material coal is easily blown away in the gasification furnace, and if the particle size of the raw material coal is more than 6mm, the reaction is insufficient, so that the reaction effect is not good.
S120, combusting the reducing gas input by the gasification furnace in the oxidation furnace to oxidize ilmenite raw materials to generate oxidized ilmenite, and inputting the oxidized ilmenite into the reduction furnace.
Specifically, the reducing gas is fed into the oxidation furnace 201 through the apparatus shown in fig. 2, and the reducing gas is oxidized and burned in the oxidation furnace 201 to release heat, and the released heat is used to provide heat required for oxidizing the ilmenite raw material, which contributes to reduction of energy consumption.
Optionally, the particle size of the ilmenite raw material is [0.3mm, 1mm ], the mass fraction of titanium dioxide in the ilmenite raw material is not lower than 40%, the temperature of the oxidation furnace is [950 ℃, 1050 ℃), and the first reaction time is [0.5h, 1h ].
Wherein the first reaction time is the time for oxidizing ilmenite raw materials to generate oxidized ilmenite by combusting the reducing gas input by the gasification furnace in the oxidation furnace.
In particular, titanium dioxide (TiO) in ilmenite feedstock2) Is not less than40 percent of ilmenite raw material with the particle size range of 0.3mm and 1.0mm]If TiO in the ilmenite feedstock2If the mass fraction of the titanium dioxide is less than 40 percent, the quality of the obtained reduced ilmenite can not meet the standard of the reduced ilmenite for welding electrodes; if the particle size of the ilmenite raw material is smaller than 0.3mm, the ilmenite raw material can be densely stacked, so that the porosity of a bed layer formed by stacking the ilmenite raw material is too small, and the material is difficult to move downwards; if the particle size of the ilmenite raw material is larger than 1.0mm, the time required for the oxidation reaction is increased, and the particle size of the reduced ilmenite produced is large, and a crushing operation is required to put the reduced ilmenite into use in the next process, so that titanium dioxide (TiO) in the ilmenite raw material is used2) Should not be less than 40% by mass, the particle size of the ilmenite raw material is [0.3mm, 1.0 mm%]。
In addition, oxidized ilmenite includes pseudobrookite and rutile. The conditions under which the ilmenite feedstock undergoes oxidation in the oxidation furnace 201 include: the temperature of the oxidation furnace 201 is [950 ℃, 1050 ℃), and the time of the oxidation reaction is [0.5h, 1h ]. Under the condition of the oxidation reaction, the primary structure of the ilmenite raw material is changed, and a large number of nano-scale micropores appear on the surfaces of the generated pseudobrookite and rutile, so that the gas phase mass transfer process during the subsequent reduction of the pseudobrookite and rutile by using reducing gas is enhanced, and the reduction efficiency is improved. It should be noted that if the temperature (temperature of the oxidation furnace) for oxidizing the ilmenite raw material is higher than 1050 ℃ and/or the time of the oxidation reaction (first reaction time) exceeds 1 hour, pores on the surface of the generated oxidized ilmenite are gradually closed to form local sintering, so that the subsequent reduction process is influenced, and the yield is reduced; if the temperature (temperature of the oxidation furnace) for oxidizing the ilmenite raw material is lower than 950 ℃ and/or the time (first reaction time) for the oxidation reaction is less than 0.5h, the oxidation reaction of the ilmenite raw material is insufficient and even the oxidation reaction of the ilmenite raw material cannot be performed, thereby affecting the production of reduced ilmenite. Therefore, in the process of oxidation reaction of the ilmenite raw material, the temperature of the oxidation furnace should be controlled in a temperature range [950 ℃, 1050 ℃), and the time for oxidation reaction of the ilmenite raw material (first reaction time) should belong to [0.5h, 1h ].
S130, reducing the oxidized ilmenite input by the oxidation furnace in the reduction furnace through the reducing gas input by the gasification furnace to generate reduced ilmenite.
Optionally, the temperature of the reduction furnace is [900 ℃, 1000 ℃), and the second reaction time is [1h, 2h ].
Wherein the second reaction time is a time for reducing the oxidized ilmenite input by the oxidation furnace through the reducing gas input by the gasification furnace in the reduction furnace to generate the reduced ilmenite.
Specifically, the conditions for the reduction reaction of the oxidized ilmenite in the reduction furnace 203 are as follows: the furnace temperature of the reduction furnace is [900 ℃, 1000 ℃), and the time of the reduction reaction (second reaction time) is any time within [1h, 2h ]. It should be noted that if the temperature of the reduction furnace is lower than 900 ℃ and/or the time of the reduction reaction is less than 1 hour, the reduction rate of the reduction reaction is slowed, and even the reduction reaction cannot occur; if the temperature of the reduction furnace is higher than 1000 ℃ and/or the time of the reduction reaction is longer than 2 hours, the generated reduced ilmenite and/or the oxidized ilmenite which has not undergone the reduction reaction can be sintered, so that the reaction is difficult to continue and the energy consumption is increased. Therefore, the furnace temperature of the reduction furnace is ensured to belong to the temperature interval [900 ℃, 1000 ℃) and the time of the reduction reaction (second reaction time) belongs to the time interval [1h, 2h ], so that the reduction of the oxidized ilmenite is more sufficient, and the energy consumption can be reduced.
According to the preparation method of the reduced ilmenite, the raw material coal is input into the gasification furnace to be gasified to generate the reducing gas, and the reducing gas is input into the oxidation furnace and the reduction furnace; combusting the reducing gas input by the gasification furnace in the oxidation furnace to oxidize ilmenite raw materials to generate oxidized ilmenite, and inputting the oxidized ilmenite into the reduction furnace; and reducing the oxidized ilmenite input by the oxidation furnace in the reduction furnace through the reducing gas input by the gasification furnace to generate reduced ilmenite. In the embodiment of the disclosure, the ilmenite raw material is oxidized in the oxidation furnace to generate oxidized ilmenite with better reactivity than the ilmenite raw material, the oxidized ilmenite is input into the reduction furnace, and the reducing gas generated by gasifying the raw material coal in the gasification furnace is introduced into the reduction furnace to reduce the oxidized ilmenite, so that the effect of reducing the oxidized ilmenite by replacing the raw material coal with the reducing gas is achieved. Because the oxidized ilmenite has better reactivity than the ilmenite raw material, the preparation efficiency of the reduced ilmenite can be improved by oxidizing and then reducing the ilmenite raw material, and the direct contact between the raw material coal and the oxidized ilmenite can be avoided by reducing the oxidized ilmenite with the reducing gas generated after the gasification reaction of the raw material coal, so that the raw material coal and the impurity elements contained in the raw material coal can be effectively prevented from being mixed into the generated reduced ilmenite, and the quality of the reduced ilmenite can be improved.
Optionally, before the reducing gas is introduced into the oxidation furnace and the reduction furnace, the method further comprises: separating solid particles in the reducing gas through a cyclone separation device, inputting the reducing gas after the solid particles are separated into the oxidation furnace and the reduction furnace, and returning the solid particles to the gasification furnace.
Specifically, referring to fig. 3, fig. 3 is a schematic structural diagram of another apparatus capable of implementing the above-mentioned method for preparing reduced ilmenite according to an embodiment of the present disclosure.
Referring to fig. 3, the apparatus further includes: and the cyclone separation device 204 is used for separating solid particles in the reducing gas output by the gasification furnace, inputting the reducing gas after the solid particles are separated into the reduction furnace 203 and returning the solid particles to the gasification furnace 202, wherein the gasification furnace 202 is communicated with the reduction furnace 203 through the cyclone separation device 204.
The solid particles in the reducing gas comprise particles of raw material coal and solid particles of other impurities mixed in the reducing gas, and the particles of the raw material coal are mixed in the reducing gas output by the gasification furnace, so that the cyclone separation device 204 is arranged between the reduction furnace 203 and the oxidation furnace 201, the mixed solid particles can be effectively removed before the reducing gas is input into the reduction furnace, on one hand, the solid particles can be prevented from entering the reduction furnace, the impurities in the generated reduced ilmenite can be further reduced, the quality of the reduced ilmenite is improved, on the other hand, the particles of the raw material coal output from the gasification furnace along with the reducing gas can be returned to the gasification furnace to participate in gasification reaction again, and further, the utilization rate of the raw material coal is improved.
Optionally, the component content of the gas in the oxidation furnace satisfies the following relation:
wherein the content of the first and second substances,
VCOrespectively the volumes of carbon dioxide, oxygen, water vapor, hydrogen and carbon monoxide in the oxidation furnace.
Specifically, referring to fig. 4, fig. 4 is a schematic structural diagram of another apparatus for implementing the above-mentioned method for preparing reduced ilmenite according to an embodiment of the present disclosure, and the oxidation furnace 201 shown in fig. 4 includes: an oxidation furnace body 2011, a feeding port 2012, a gas inlet 2013, a discharging port 2014, a gas outlet 2015 and a reducing gas inlet 2016. The material inlet 2012 of the oxidation furnace is used for conveying the ilmenite raw material into the oxidation furnace body 2011, the material inlet 2013 of the oxidation furnace is used for inputting oxygen into the oxidation furnace body 2011, the material outlet 2014 of the oxidation furnace is used for inputting the ilmenite oxide into the reduction furnace body through the material inlet of the reduction furnace, the gas outlet 2015 of the oxidation furnace is used for outputting oxidized tail gas generated in the oxidation furnace body, and the reducing gas inlet 2016 is used for inputting reducing gas output from the cyclone separation device into the oxidation furnace body. The discharge port 2014 of the oxidation furnace may be used to input the reduction tail gas generated by the reduction furnace into the oxidation furnace body. The oxidation furnace controls the gas atmosphere in the oxidation furnace body by controlling the oxygen input from the gas inlet 2013, the reducing tail gas input from the gas outlet 2014 and the reducing gas input from the reducing gas inlet 2016, so that the component content of the gas in the oxidation furnace satisfies the above relational expression (1). When the component content of the gas in the oxidation furnace satisfies the relation (1), the ilmenite raw material in the oxidation furnace is completely oxidized, and the effect of the oxidation reaction is good.
The reduction tail gas (gas generated by reducing and oxidizing ilmenite in the reduction furnace) input to the oxidation furnace through the discharge port 2014 contains the reduction gas which does not participate in the reaction in the reduction furnace, and the reduction gas is combusted and oxidized in the oxidation furnace, so that sensible heat is provided for the oxidation of the ilmenite raw material, and the reduction furnace contributes to reducing the energy consumption of a system (a preparation system for reducing ilmenite). Compared with the direct reduction of the ilmenite raw material, the method can not only improve the yield and quality of the reduced ilmenite, but also reduce the energy consumption.
Optionally, the composition content of the gas in the reduction furnace satisfies the following relation:
wherein the content of the first and second substances,
VCOthe volumes of carbon dioxide, oxygen, water vapor, hydrogen and carbon monoxide in the reduction furnace are respectively.
Optionally, the reducing gas comprises: hydrogen, and the volume fraction of the hydrogen belongs to [ 60%, 80% ].
The main component of the reducing gas comprises hydrogen (H)2) And carbon monoxide (CO), wherein H in the reducing gas2The volume fraction of (a) falls within the fraction interval [ 60%, 80%]. It should be noted that the H in the reducing gas can be controlled by controlling the degree of gasification reaction in the gasification furnace2Content of, H in reducing gas2The higher the content of (b), the higher the rate at which the oxidized ilmenite in the reduction furnace is reduced, but since the chemical reactions are all accompanied by changes in heat, the higher the reduction rate is with an increase in the hydrogen content, the more difficult it is to maintain the temperature of the reduction reaction stable, thereby affecting the progress of the reduction reaction. When reducing H in the gas in the reduction furnace2When the content satisfies the relation (2), the reduction reaction is complete, and titanium is reducedThe highest yield of iron ore, i.e., the atmosphere satisfying the relation (2), is the most suitable atmosphere for the reduction reaction of oxidized ilmenite.
Referring to fig. 4, the method for preparing reduced ilmenite described in the above example may be implemented by the apparatus shown in fig. 4.
Specifically, the gasification furnace 202 shown in fig. 4 includes: a gasification furnace body 2021, a feeding port 2022, an air inlet 2023, a discharging port 2024 and an air outlet 2025. The material inlet 2022 of the gasification furnace 202 is used for conveying the raw material coal to the gasification furnace body 2021, the gas inlet 2023 of the gasification furnace is used for inputting oxygen to the gasification furnace body 2021, the material outlet 2024 of the gasification furnace is used for outputting ash generated after the raw material coal is gasified, and the gas outlet 2025 of the gasification furnace is used for outputting the reducing gas generated by gasifying the raw material coal to the cyclone separation device.
The cyclonic separating apparatus 204 comprises: an air inlet 2041, a return leg 2042, and an air outlet 2043. The gas inlet 2041 of the cyclone separation device 204 is communicated with a gas outlet of the gasification furnace for outputting the reducing gas, the gas outlet 2043 of the cyclone separation device is communicated with a gas inlet of the reduction furnace for inputting the reducing gas, and the material returning leg 2042 is used for conveying the separated solid particles back to the gasification furnace.
The reduction furnace 203 includes: a reducing furnace body 2031, a feeding port 2032, an air inlet 2033 and a discharging port 2034. The reduction furnace has a feed inlet 2032 for feeding the oxidized ilmenite output from the oxidation furnace into a reduction furnace body 2031 and for feeding a reduction tail gas generated by reducing the oxidized ilmenite in the reduction furnace into the oxidation furnace, an air inlet 2033 for feeding the reduction gas output from the cyclone separation device into the reduction furnace body 2031, and an outlet for outputting the generated reduced ilmenite.
It should be noted that the material inlet 2032 of the reduction furnace is located at the top of the reduction furnace body 2031, and the material outlet 2034 and the gas inlet 2033 of the reduction furnace are located at the bottom of the reduction furnace 203. The air inlet 2013 and the discharge port 2014 of the oxidation furnace 201 are positioned at the bottom of the oxidation furnace body, the feeding port 2012 of the oxidation furnace 201 is positioned at the top of the oxidation furnace body, and the air inlet 2013 and the discharge port 2014 of the oxidation furnace are positioned at the bottom of the oxidation furnace body. The gas inlet 2023 and the discharge port 2024 of the gasification furnace 202 are located at the bottom of the gasification furnace body, the side wall of the gasification furnace close to the cyclone separation device is provided with a material return port 2026, the material return port 2026 is communicated with the material return leg 2042 of the cyclone separation device, and the separated solid particles are conveyed back to the gasification furnace body.
The discharge port 2014 of the oxidation furnace is communicated with the feeding port 2032 positioned at the top of the reduction furnace body to form a channel for the oxidized ilmenite to enter the reduction furnace body, and the channel can also be used as a channel for the reduced tail gas formed by the reduction reaction in the reduction furnace body to enter the oxidation furnace body. The gas inlet 2033 is communicated with a gas outlet 2043 located on the first side wall of the cyclone separation device 204, and is used for inputting the reducing gas after the solid particles are separated into the reduction furnace 203, and the generated reduced ilmenite is directly output through the discharge port 2034 and cooled to normal temperature. The feeding port 2022 and the air outlet 2025 of the gasification furnace 202 are located at the top of the gasification furnace 202, the air outlet 2025 is communicated with the air inlet 2041 located on the second side wall of the cyclone separation device 204, and the generated reducing gas can be directly input into the cyclone separation device, wherein the first side wall and the second side wall of the cyclone separation device are opposite.
The feeding port of the reduction furnace is positioned at the top of the reduction furnace body and is communicated with the discharge port of the oxidation furnace, so that the oxidized ilmenite output from the oxidation furnace can be directly input into the reduction furnace body, and the reduction tail gas generated in the reduction furnace during reduction of the oxidized ilmenite can be directly introduced into the oxidation furnace body to provide sensible heat for the oxidation furnace, thereby reducing the energy consumption of the oxidized ilmenite raw material in the oxidation furnace. The feeding port of the reducing furnace is also used for outputting the reducing tail gas, so the aim of simplifying the equipment is fulfilled. The gasifier is communicated with the reduction furnace through the gas outlet, and can directly introduce the reducing gas generated in the gasifier into the reduction furnace, so that a reducing agent is provided for reduction of oxidized ilmenite in the reduction furnace.
Optionally, the method further includes: and inputting tail gas generated by the oxidation furnace into the gasification furnace.
With reference to fig. 5, fig. 5 is a schematic structural diagram of another apparatus capable of implementing the above-mentioned method for preparing reduced ilmenite according to an embodiment of the present disclosure. In the apparatus shown in fig. 5, the gasification furnace 202 further includes: and an oxidation tail gas inlet 2027 positioned at the bottom and used for inputting the oxidation tail gas generated by oxidizing the ilmenite raw material by the oxidation furnace into the gasifier body. An oxidation tail gas inlet 2027 at the bottom of the gasification furnace is communicated with an air outlet 2015 of the oxidation furnace to form a channel for directly feeding oxidation tail gas into the gasification furnace. The oxidation tail gas is input into the gasification furnace, so that on one hand, the oxidation gas required by the gasification of the raw material coal can be provided, and on the other hand, the gasification furnace can make full use of sensible heat generated by the oxidation furnace, thereby reducing the energy consumption.
The gas inlet 2013 and the discharge port 2014 of the oxidation furnace are arranged at the bottom of the furnace body of the oxidation furnace, the gas flow of the oxygen input through the gas inlet 2013 moves upwards, and the bed layer formed by the ilmenite raw material is positioned at the bottom of the oxidation furnace, so that the oxygen can be fully contacted with the ilmenite raw material in the process of moving upwards to pass through the bed layer formed by the ilmenite raw material, and the oxidation efficiency of the ilmenite raw material is improved.
Further, the oxidation furnace 201 may be disposed above the reduction furnace 203, and the oxidation furnace 201 and/or the reduction furnace 203 may be moved in a horizontal direction. When the oxidation furnace is positioned above the reduction furnace, the oxidized ilmenite can enter the reduction furnace body through the discharge hole 2014 of the oxidation furnace and the feeding hole 2032 of the reduction furnace under the action of gravity, and the oxidized ilmenite is transferred to the reduction furnace without an additional device or equipment, so that the purposes of simplifying the equipment and the operation are achieved.
According to the embodiment of the disclosure, the oxidation furnace, the gasification furnace and the reduction furnace are connected in the manner, and the preparation process of reducing the ilmenite is controlled according to the process conditions, so that the oxidation and the reduction of the ilmenite raw material can be simultaneously carried out.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The foregoing are merely exemplary embodiments of the present disclosure, which enable those skilled in the art to understand or practice the present disclosure. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the disclosure. Thus, the present disclosure is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A preparation method of reduced ilmenite is characterized by comprising the following steps:
feeding raw material coal into a gasification furnace for gasification to generate reducing gas, and feeding the reducing gas into an oxidation furnace and a reduction furnace;
combusting the reducing gas input by the gasification furnace in the oxidation furnace to oxidize ilmenite raw materials to generate oxidized ilmenite, and inputting the oxidized ilmenite into the reduction furnace;
and reducing the oxidized ilmenite input by the oxidation furnace in the reduction furnace through the reducing gas input by the gasification furnace to generate reduced ilmenite.
2. The method of claim 1, further comprising:
and inputting tail gas generated by the oxidation furnace into the gasification furnace.
3. The method of claim 1,
the temperature of the gasification furnace is (800 ℃, 1000 ℃) and the granularity of the raw material coal is (1 mm, 6 mm).
4. The method of claim 1, wherein the reducing gas comprises: hydrogen, and the volume fraction of the hydrogen belongs to [ 60%, 80% ].
5. The method of claim 1,
the component content of the gas in the oxidation furnace satisfies the following relational expression:
wherein the content of the first and second substances,
VCOrespectively the volumes of carbon dioxide, oxygen, water vapor, hydrogen and carbon monoxide in the oxidation furnace.
6. The method according to claim 1 or 5,
the particle size of the ilmenite raw material belongs to [0.3mm, 1mm ], the mass fraction of titanium dioxide in the ilmenite raw material is not lower than 40%, the temperature of the oxidation furnace belongs to [950 ℃, 1050 ℃), and the first reaction time belongs to [0.5h, 1h ];
wherein the first reaction time is the time for combusting the reducing gas input by the gasification furnace in the oxidation furnace to oxidize the ilmenite raw material to generate the oxidized ilmenite.
7. The method of claim 1,
the component contents of the gas in the reduction furnace satisfy the following relational expression:
wherein the content of the first and second substances,
VCOthe volumes of carbon dioxide, oxygen, water vapor, hydrogen and carbon monoxide in the reduction furnace are respectively.
8. The method according to claim 1 or 7,
the temperature of the reduction furnace belongs to [900 ℃, 1000 ℃), and the second reaction time belongs to [1h, 2h ];
wherein the second reaction time is a time for reducing the oxidized ilmenite input by the oxidation furnace through the reducing gas input by the gasification furnace in the reduction furnace to generate the reduced ilmenite.
9. The method according to claim 1, wherein before the reducing gas is introduced into the oxidizing furnace and the reducing furnace, the method further comprises:
separating solid particles in the reducing gas through a cyclone separation device, inputting the reducing gas after the solid particles are separated into the oxidation furnace and the reduction furnace, and returning the solid particles to the gasification furnace.
10. A production apparatus for reducing ilmenite, characterized by comprising: a gasification furnace, an oxidation furnace and a reduction furnace;
the gasification furnace is respectively communicated with the oxidation furnace and the reduction furnace and is used for gasifying input raw material coal to generate reducing gas and inputting the reducing gas into the oxidation furnace and the reduction furnace;
the oxidation furnace is communicated with the reduction furnace and is used for combusting the reducing gas input by the gasification furnace to oxidize ilmenite raw materials to generate oxidized ilmenite and inputting the oxidized ilmenite into the reduction furnace;
the reduction furnace is used for reducing the oxidized ilmenite input by the oxidation furnace through the reducing gas input by the gasification furnace to generate reduced ilmenite.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111021659.1A CN113832280A (en) | 2021-09-01 | 2021-09-01 | Method and apparatus for producing reduced ilmenite |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111021659.1A CN113832280A (en) | 2021-09-01 | 2021-09-01 | Method and apparatus for producing reduced ilmenite |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113832280A true CN113832280A (en) | 2021-12-24 |
Family
ID=78961935
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111021659.1A Pending CN113832280A (en) | 2021-09-01 | 2021-09-01 | Method and apparatus for producing reduced ilmenite |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113832280A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1275624A (en) * | 2000-05-30 | 2000-12-06 | 宝山钢铁股份有限公司 | Apparatus and process for producing sponge iron by using coal gas-making shaft furnace to reduce iron ore |
| WO2009007007A1 (en) * | 2007-07-10 | 2009-01-15 | Outotec Oyj | Process and plant for reducing solids containing iron oxide |
| CN202007243U (en) * | 2011-01-25 | 2011-10-12 | 吴道洪 | Fluidized bed system for reducing vanadium titanomagnetite powder with coal-prepared reducing gas |
| WO2011123888A1 (en) * | 2010-04-06 | 2011-10-13 | Iluka Resources Limited | Improved synthetic rutile process a |
| CN105648207A (en) * | 2016-02-25 | 2016-06-08 | 攀钢集团攀枝花钢铁研究院有限公司 | Production method for reduced ilmenite powder |
| CN109054900A (en) * | 2018-08-17 | 2018-12-21 | 新奥科技发展有限公司 | A kind of coal gasification method and system |
| CN109929958A (en) * | 2019-04-25 | 2019-06-25 | 中冶赛迪技术研究中心有限公司 | Utilize the method and system of Ou Yelu gasification furnace output coal gas production direct reduced iron |
-
2021
- 2021-09-01 CN CN202111021659.1A patent/CN113832280A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1275624A (en) * | 2000-05-30 | 2000-12-06 | 宝山钢铁股份有限公司 | Apparatus and process for producing sponge iron by using coal gas-making shaft furnace to reduce iron ore |
| WO2009007007A1 (en) * | 2007-07-10 | 2009-01-15 | Outotec Oyj | Process and plant for reducing solids containing iron oxide |
| WO2011123888A1 (en) * | 2010-04-06 | 2011-10-13 | Iluka Resources Limited | Improved synthetic rutile process a |
| CN202007243U (en) * | 2011-01-25 | 2011-10-12 | 吴道洪 | Fluidized bed system for reducing vanadium titanomagnetite powder with coal-prepared reducing gas |
| CN105648207A (en) * | 2016-02-25 | 2016-06-08 | 攀钢集团攀枝花钢铁研究院有限公司 | Production method for reduced ilmenite powder |
| CN109054900A (en) * | 2018-08-17 | 2018-12-21 | 新奥科技发展有限公司 | A kind of coal gasification method and system |
| CN109929958A (en) * | 2019-04-25 | 2019-06-25 | 中冶赛迪技术研究中心有限公司 | Utilize the method and system of Ou Yelu gasification furnace output coal gas production direct reduced iron |
Non-Patent Citations (2)
| Title |
|---|
| 周安宁等主编, 中国矿业大学出版社 * |
| 闫方兴等: "气基竖炉用含钒钛海滨砂矿球团直接还原试验研究", 《钢铁钒钛》 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| AU2003261814B2 (en) | Method for producing titanium oxide containing slag | |
| US2855290A (en) | Method of reducing iron oxide to sponge iron | |
| CN111961784B (en) | Method and system for reduction reaction of iron ore powder in bubbling bed | |
| JP2011529840A (en) | Carbide manufacturing method and system | |
| CA2721101C (en) | Process for using a facility for combusting carbonaceous materials | |
| CN105176594B (en) | A kind of device and method for brown coal hydrogasification system also Primordial Qi | |
| JP4487564B2 (en) | Ferro-coke manufacturing method | |
| MX2009000735A (en) | Method and apparatus for reducing metalliferous material to a reduction product. | |
| CA2692943C (en) | Process and plant for reducing solids containing iron oxide | |
| CN109897672A (en) | The device and method produced using circulation of tail gas coal gasification | |
| RU2477755C2 (en) | Method and device for preparation of reducing agent to be used during metal production, metal production process and metal production unit using above described device | |
| JP2006028594A (en) | Method for operating blast furnace | |
| CN105084361B (en) | A kind of gas heating multistage calcium carbide reactor and its technique | |
| CN113832280A (en) | Method and apparatus for producing reduced ilmenite | |
| JP4182787B2 (en) | Method for producing metallurgical furnace raw materials | |
| CN106006555B (en) | A kind of system and method preparing hydrogen-rich gas and calcium carbide | |
| WO1999016912A1 (en) | Method of operating rotary hearth furnace for reducing oxides | |
| CN107267218A (en) | The method and system of solid fuel pyrolysis gasification | |
| JPH07228910A (en) | Method and equipment for manufacturing iron | |
| JP2008056985A (en) | Method for operating blast furnace | |
| CN207193218U (en) | A kind of biomass char vaporizing system for synthesis gas system | |
| CN114314508B (en) | Poly-generation method and system for coupling biomass baking and chemical chain conversion | |
| JP3879408B2 (en) | Method for producing sintered ore and sintered ore | |
| JP6637591B2 (en) | Gas making rapid steelmaking system and method | |
| KR101660697B1 (en) | Device and method for manufacturing molten iron |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20211224 |
|
| RJ01 | Rejection of invention patent application after publication |