CN110629054A - Preparation device of manganese-rich slag - Google Patents
Preparation device of manganese-rich slag Download PDFInfo
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- CN110629054A CN110629054A CN201911046903.2A CN201911046903A CN110629054A CN 110629054 A CN110629054 A CN 110629054A CN 201911046903 A CN201911046903 A CN 201911046903A CN 110629054 A CN110629054 A CN 110629054A
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- manganese
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- smelting furnace
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- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 title claims abstract description 137
- 229910052748 manganese Inorganic materials 0.000 title claims abstract description 137
- 239000011572 manganese Substances 0.000 title claims abstract description 137
- 239000002893 slag Substances 0.000 title claims abstract description 78
- 238000002360 preparation method Methods 0.000 title claims abstract description 10
- 238000003723 Smelting Methods 0.000 claims abstract description 87
- 238000002485 combustion reaction Methods 0.000 claims abstract description 53
- 239000007921 spray Substances 0.000 claims abstract description 36
- 238000007664 blowing Methods 0.000 claims abstract description 24
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 23
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 22
- 239000000446 fuel Substances 0.000 claims abstract description 22
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 22
- 239000001301 oxygen Substances 0.000 claims abstract description 22
- 238000002844 melting Methods 0.000 claims abstract description 16
- 230000008018 melting Effects 0.000 claims abstract description 16
- 239000007788 liquid Substances 0.000 claims abstract description 14
- 230000009471 action Effects 0.000 claims abstract description 6
- 239000000428 dust Substances 0.000 claims description 44
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 38
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 20
- 239000003546 flue gas Substances 0.000 claims description 19
- 229910052742 iron Inorganic materials 0.000 claims description 19
- 239000000203 mixture Substances 0.000 claims description 19
- 239000000779 smoke Substances 0.000 claims description 16
- 238000002347 injection Methods 0.000 claims description 14
- 239000007924 injection Substances 0.000 claims description 14
- 239000002918 waste heat Substances 0.000 claims description 14
- 238000006477 desulfuration reaction Methods 0.000 claims description 13
- 230000023556 desulfurization Effects 0.000 claims description 13
- 230000004907 flux Effects 0.000 claims description 12
- 239000000843 powder Substances 0.000 claims description 12
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 9
- 238000005453 pelletization Methods 0.000 claims description 9
- 239000007789 gas Substances 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 6
- 238000005469 granulation Methods 0.000 claims description 4
- 230000003179 granulation Effects 0.000 claims description 4
- 239000008188 pellet Substances 0.000 claims description 4
- 239000003570 air Substances 0.000 abstract description 19
- 238000005507 spraying Methods 0.000 abstract description 14
- 230000009467 reduction Effects 0.000 abstract description 12
- 238000000034 method Methods 0.000 description 41
- 230000008569 process Effects 0.000 description 22
- 239000000463 material Substances 0.000 description 14
- 239000002245 particle Substances 0.000 description 14
- 229910000805 Pig iron Inorganic materials 0.000 description 12
- 238000006722 reduction reaction Methods 0.000 description 12
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 10
- 238000004519 manufacturing process Methods 0.000 description 8
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 8
- 238000006243 chemical reaction Methods 0.000 description 7
- 239000000571 coke Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 230000009286 beneficial effect Effects 0.000 description 5
- 238000005266 casting Methods 0.000 description 5
- 239000003245 coal Substances 0.000 description 5
- 238000001035 drying Methods 0.000 description 5
- 239000008187 granular material Substances 0.000 description 5
- 229910052698 phosphorus Inorganic materials 0.000 description 5
- 239000011574 phosphorus Substances 0.000 description 5
- 238000011084 recovery Methods 0.000 description 5
- 238000011946 reduction process Methods 0.000 description 5
- 229910021532 Calcite Inorganic materials 0.000 description 4
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 4
- 238000005245 sintering Methods 0.000 description 4
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 3
- 229910052681 coesite Inorganic materials 0.000 description 3
- 229910052593 corundum Inorganic materials 0.000 description 3
- 229910052906 cristobalite Inorganic materials 0.000 description 3
- 238000007599 discharging Methods 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 239000003345 natural gas Substances 0.000 description 3
- 239000000377 silicon dioxide Substances 0.000 description 3
- 229910052682 stishovite Inorganic materials 0.000 description 3
- 229910052905 tridymite Inorganic materials 0.000 description 3
- 229910001845 yogo sapphire Inorganic materials 0.000 description 3
- 235000019738 Limestone Nutrition 0.000 description 2
- 239000006004 Quartz sand Substances 0.000 description 2
- 229910018540 Si C Inorganic materials 0.000 description 2
- 230000001174 ascending effect Effects 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000010459 dolomite Substances 0.000 description 2
- 229910000514 dolomite Inorganic materials 0.000 description 2
- 239000006028 limestone Substances 0.000 description 2
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000010453 quartz Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000004062 sedimentation Methods 0.000 description 2
- 239000004575 stone Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229910052841 tephroite Inorganic materials 0.000 description 2
- 229910000914 Mn alloy Inorganic materials 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- -1 gangue Substances 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000003915 liquefied petroleum gas Substances 0.000 description 1
- NUJOXMJBOLGQSY-UHFFFAOYSA-N manganese dioxide Inorganic materials O=[Mn]=O NUJOXMJBOLGQSY-UHFFFAOYSA-N 0.000 description 1
- PYLLWONICXJARP-UHFFFAOYSA-N manganese silicon Chemical compound [Si].[Mn] PYLLWONICXJARP-UHFFFAOYSA-N 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 239000011265 semifinished product Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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
- C21B13/0006—Making spongy iron or liquid steel, by direct processes obtaining iron or steel in a molten state
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/006—Starting from ores containing non ferrous metallic oxides
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/008—Use of special additives or fluxing agents
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B47/00—Obtaining manganese
-
- 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
- C22B5/10—Dry methods smelting of sulfides or formation of mattes by solid carbonaceous reducing agents
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention provides a preparation device of manganese-rich slag. The device comprises a side-blown submerged combustion smelting furnace and at least one side-blown spray gun, wherein the side-blown submerged combustion smelting furnace is provided with a manganese ore inlet and is used for melting and reducing manganese ore under the action of oxygen-enriched air, fuel and a reducing agent to generate manganese-enriched slag; a spray hole is formed in the side wall of the side-blown submerged combustion smelting furnace; the side-blown spray gun is used for spraying oxygen-enriched air, fuel and reducing agent into a molten pool in the side-blown submerged combustion smelting furnace through a spray hole. The invention utilizes a side-blowing submerged combustion smelting furnace as the melting reduction equipment of manganese ore, the working condition in the furnace is a liquid molten bath, and oxygen-enriched air, fuel and reducing agent are sprayed into the molten bath from the side part by a side-blowing spray gun in a mode of immersing the molten bath, so that the manganese ore is melted and reduced to generate manganese-enriched slag.
Description
Technical Field
The invention relates to the technical field of metallurgy, in particular to a preparation device of manganese-rich slag.
Background
At present, the method for enriching manganese by using high-iron high-phosphorus refractory poor manganese ore mainly adopts a blast furnace smelting manganese-rich slag method, which is also a more method applied at home and abroad. The basic principle of the blast furnace manganese-rich slag smelting method is that valuable metals are reduced in different temperature intervals by utilizing different reduction temperatures of manganese, phosphorus and iron, so that the high-temperature separation method for selectively separating manganese, iron and phosphorus is realized.
The main process flow of blast furnace smelting manganese-rich slag is as follows: after batching and mixing, the manganese ore powder enters a sintering machine to be agglomerated; and sending the sintered ore into a blast furnace for selective reduction smelting. However, the sintering process of the sintering machine and the smelting process of the blast furnace selective reduction smelting have the problems of dust pollution, large consumption of auxiliary materials, large consumption of coke and electricity for smelting, slightly high production cost and the like.
Disclosure of Invention
The invention mainly aims to provide a preparation device of manganese-rich slag, which is used for solving the problems of dust pollution, high auxiliary material consumption and high production cost in the prior art when a blast furnace smelting process of the manganese-rich slag is adopted.
In order to achieve the above object, according to an aspect of the present invention, there is provided a manganese-rich slag manufacturing apparatus, including: the side-blown submerged combustion smelting furnace is provided with a manganese ore inlet and is used for melting and reducing manganese ore under the action of oxygen-enriched air, fuel and a reducing agent to generate manganese-enriched slag; a spray hole is formed in the side wall of the side-blown submerged combustion smelting furnace; and the side-blowing spray gun is used for spraying oxygen-enriched air, fuel and reducing agent into a molten pool in the side-blowing submerged combustion smelting furnace through the spray holes.
Further, the apparatus further comprises: a blowing system; and the powder injection recarburization spray gun is connected with an outlet of the injection system and is used for injecting carbon powder to a liquid iron layer in a molten pool inside the side-blown submerged combustion smelting furnace through an injection hole.
Further, the device also comprises a granulating unit, wherein the granulating unit is provided with a granule outlet for granulating the mixture of the manganese ore and the fusing agent, and the granule outlet is connected with a manganese ore inlet of the side-blown submerged combustion smelting furnace.
Further, the device also comprises a batching unit which is connected with the granulating unit and is used for mixing the manganese ore and the fusing agent to obtain a mixture.
Furthermore, the side-blown submerged combustion smelting furnace is also provided with a manganese-rich slag outlet, and the device further comprises an ingot casting unit which is connected with the manganese-rich slag outlet and used for casting manganese-rich slag.
Further, the side-blown submerged combustion smelting furnace is also provided with a flue gas outlet; the device also comprises a waste heat boiler, wherein the waste heat boiler is provided with a heat medium inlet and a heat medium outlet, and the heat medium inlet is connected with the smoke outlet.
Furthermore, the device also comprises a dust removal unit, wherein the dust removal unit is connected with the heat medium outlet and is used for carrying out dust removal treatment on the flue gas discharged from the heat medium outlet.
Further, the dust removal unit is an electric dust collector or a bag-type dust collector.
Further, the device also comprises a desulfurization unit, wherein the desulfurization unit is connected with the gas-phase outlet of the dust removal unit and is used for performing desulfurization treatment on the flue gas discharged from the gas-phase outlet.
The invention provides a preparation device of manganese-rich slag, which comprises a side-blown submerged combustion smelting furnace and at least one side-blown spray gun, wherein the side-blown submerged combustion smelting furnace is provided with a manganese ore inlet and is used for melting and reducing manganese ore under the action of oxygen-enriched air, fuel and a reducing agent to generate the manganese-rich slag; a spray hole is formed in the side wall of the side-blown submerged combustion smelting furnace; the side-blown spray gun is used for spraying oxygen-enriched air, fuel and reducing agent into a molten pool in the side-blown submerged combustion smelting furnace through a spray hole. The invention utilizes a side-blowing submerged combustion smelting furnace as the melting reduction equipment of manganese ore, the working condition in the furnace is a liquid molten bath, and oxygen-enriched air, fuel and reducing agent are sprayed into the molten bath from the side part by a side-blowing spray gun in a mode of immersing the molten bath, so that the manganese ore is melted and reduced to generate manganese-enriched slag.
The manganese-rich slag is prepared by the device, the process flow is shortened, the traditional sintering-blast furnace equipment is replaced, the production requirement can be met only by one side-blown submerged combustion smelting furnace, the dust pollution is thoroughly eliminated, the environment is improved, and the investment is reduced. Meanwhile, the traditional sintering-blast furnace process flow has strict requirements on the particle size of manganese ore, the requirement is 0-6 mm, and the device of the invention has no special limitation on the particle size and can be smaller than 10 cm. In addition, the device provided by the invention is used for preparing the manganese-rich slag, so that the fuel utilization rate is improved, and the energy-saving effect is good.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 shows a block diagram of a manganese-rich slag manufacturing apparatus according to an embodiment of the present invention.
Wherein the figures include the following reference numerals:
10. a side-blown submerged combustion smelting furnace; 20. a blowing system; 30. a granulation unit; 40. a dosing unit; 50. an ingot unit; 60. a waste heat boiler; 70. a dust removal unit; 80. a desulfurization unit;
A. oxygen-enriched air; B. a fuel; C. a reducing agent; D. manganese-rich slag ingots; E. pig iron; F. smoke dust; G. and (5) purifying the flue gas.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
The present application is described in further detail below with reference to specific examples, which should not be construed as limiting the scope of the invention as claimed.
As described in the background art, the problems of dust pollution, large auxiliary material consumption and high production cost exist when the blast furnace smelting manganese-rich slag process is adopted.
In order to solve the above problems, the present invention provides a manganese-rich slag preparation apparatus, as shown in fig. 1, comprising a side-blown submerged combustion smelting furnace 10 and at least one side-blown lance, wherein the side-blown submerged combustion smelting furnace 10 is provided with a manganese ore inlet, and the side-blown submerged combustion smelting furnace 10 is used for melting and reducing manganese ore under the action of oxygen-enriched air a, fuel B and reducing agent C to generate manganese-rich slag; a spray hole is arranged on the side wall of the side-blown submerged combustion smelting furnace 10; the side-blowing lance is used for injecting oxygen-enriched air A, fuel B and reducing agent C into a molten pool in the side-blowing submerged combustion smelting furnace 10 through an injection hole.
The invention utilizes a side-blown submerged combustion smelting furnace 10 as melting reduction equipment of manganese ores, the working condition in the furnace is a liquid molten bath, and oxygen-enriched air, fuel and reducing agent are sprayed into the molten bath from the side part in a mode of immersing the molten bath by utilizing a side-blown spray gun, so that the manganese ores are melted and reduced to generate manganese-enriched slag.
The manganese-rich slag is prepared by the device, the process flow is shortened, the traditional sintering-blast furnace equipment is replaced, the production requirement can be met only by one side-blown submerged combustion smelting furnace 10, the dust pollution is thoroughly eliminated, the environment is improved, and the investment is reduced. Meanwhile, the traditional sintering-blast furnace process flow has strict requirements on the particle size of manganese ore, the requirement is 0-6 mm, and the device of the invention has no special limitation on the particle size and can be smaller than 10 cm. In addition, the device provided by the invention is used for preparing the manganese-rich slag, so that the fuel utilization rate is improved, and the energy-saving effect is good.
In a preferred embodiment, as shown in fig. 1, the apparatus further comprises a blowing system 20 and a powder injection and recarburization spray gun, wherein the powder injection and recarburization spray gun is connected with an outlet of the blowing system 20 and is used for blowing carbon powder to a liquid iron layer in a molten pool inside the side-blown submerged combustion smelting furnace 10 through a spray hole. In the side-blown submerged combustion smelting furnace 10, a series of metallurgical physical and chemical changes occur in the material charged into the furnace. Iron and phosphorus in the manganese ore are reduced by carbon to produce pig iron, and higher oxides of manganese are reduced to lower oxides and enter the slag to form manganese-rich slag. By utilizing the injection system 20 and the powder injection recarburization spray gun to inject carbon powder to a liquid iron layer in a molten pool, the melting point of pig iron on a metal layer can be reduced, the discharge and sedimentation layering are facilitated, the produced manganese-rich slag and pig iron E can be better separated, and the pig iron E can be directly packed and sold.
In a preferred embodiment, the apparatus further comprises a pelletizing unit 30, the pelletizing unit 30 being provided with a pellet outlet for pelletizing the mixture of manganese ore and flux, the pellet outlet being connected to the manganese ore inlet of the side-blown submerged combustion smelting furnace 10. After the mixture of manganese ore and flux is pelletized, the material enters the side-blown submerged combustion smelting furnace 10 to further improve the efficiency of smelting reduction. And the addition of the flux is also beneficial to further improving the conversion rate of manganese and reducing the reduction reaction temperature. The flux added in the process includes but is not limited to one or more of gangue, quartz sand, quartz stone, limestone and dolomite. Reducing high valence manganese into low valence oxide in the reduction process, and reacting with SiO in the flux in the form of MnO2Formation of Mn2SiO4And then the manganese-rich slag is added.
In a preferred embodiment, as shown in fig. 1, the apparatus further comprises a dosing unit 40, the dosing unit 40 being connected to the granulation unit 30 for mixing the manganese ore and the flux to obtain a mixture. More preferably, the apparatus further comprises a drying unit disposed on a flow path between the manganese ore inlet and the pelletizing unit 30, for drying the moisture content of the material produced by the pelletizing unit 30 to below 15 wt%. The batching unit 40 can be used for batching the manganese ore and the flux, for example, a stirrer can be used for stirring and uniformly mixing the mixture. The moisture content of the material entering the reaction sequence can be controlled by the drying unit, and of course, when the moisture content of the material itself is low (for example, less than 15 wt%), the drying unit does not need to be operated.
In a more preferred embodiment, the side-blown submerged combustion smelting furnace 10 is further provided with a manganese-rich slag outlet, and the apparatus further comprises an ingot unit 50, the ingot unit 50 being connected to the manganese-rich slag outlet for the purpose of ingot manganese-rich slag. And after the step of casting, packaging the obtained manganese-rich slag casting D for sale.
In a preferred embodiment, the side-blown submerged combustion smelting furnace 10 is further provided with a flue gas outlet; the device also comprises a waste heat boiler 60, wherein the waste heat boiler 60 is provided with a heat medium inlet and a heat medium outlet, and the heat medium inlet is connected with the smoke outlet. The heat in the flue gas can be effectively recovered by using the exhaust heat boiler 60. More preferably, the device further comprises a dust removal unit 70, and the dust removal unit 70 is connected to the heat medium outlet and is used for performing dust removal treatment on the flue gas discharged from the heat medium outlet. The specific dust removing unit 70 may be of a type commonly used in the field of flue gas dust removal, for example, the dust removing unit 70 is an electric dust collector or a bag-type dust collector. After dust removal, the obtained smoke dust F can be subjected to harmless treatment.
In order to further improve the environmental protection performance of the processing device, in a preferred embodiment, the device further comprises a desulfurization unit 80, the desulfurization unit 80 is connected with the gas phase outlet of the dust removal unit 70, and is used for performing desulfurization treatment on the flue gas discharged from the gas phase outlet, and the obtained purified flue gas G can be directly discharged to the atmosphere.
According to another aspect of the present invention, there is also provided a method for preparing manganese-rich slag, comprising the steps of: adding manganese ore into a side-blown submerged combustion smelting furnace, and simultaneously spraying oxygen-enriched air, fuel and a reducing agent into a molten pool from the side part of the side-blown submerged combustion smelting furnace by using a side-blown spray gun to melt and reduce the manganese ore under the action of the oxygen-enriched air, the fuel and the reducing agent to obtain manganese-enriched slag.
The invention utilizes a side-blowing submerged combustion smelting furnace as the melting reduction equipment of manganese ore, the working condition in the furnace is a liquid molten bath, and oxygen-enriched air, fuel and reducing agent are sprayed into the molten bath from the side part by a side-blowing spray gun in a mode of immersing the molten bath, so that the manganese ore is melted and reduced to generate manganese-enriched slag.
The method for preparing the manganese-rich slag shortens the process flow, replaces the traditional sintering-blast furnace process, can meet the production requirement only by one side-blown submerged combustion smelting furnace, thoroughly eliminates dust pollution, improves the environment and reduces the investment. Meanwhile, the traditional sintering-blast furnace process flow has strict requirements on the particle size of manganese ore, the requirement is 0-6 mm, and the device of the invention has no special limitation on the particle size and can be smaller than 10 cm. In addition, the device provided by the invention is used for preparing the manganese-rich slag, so that the fuel utilization rate is improved, and the energy-saving effect is good.
In a preferred embodiment, the method further comprises the steps of, during the melting reduction: and a powder injection and recarburization spray gun is used for injecting carbon powder to the liquid iron layer in the molten pool through the side part of the side-blown submerged combustion smelting furnace. In a side-blown submerged combustion smelting furnace, a series of metallurgical physical and chemical changes occur to the materials fed into the furnace. Iron and phosphorus in the manganese ore are reduced by carbon to produce pig iron, and higher oxides of manganese are reduced to lower oxides and enter the slag to form manganese-rich slag. By using the injection system and the powder injection recarburization spray gun to inject carbon powder to the liquid iron layer in the molten pool, the melting point of the pig iron on the metal layer can be reduced, and the discharge and sedimentation layering are facilitated.
In order to further improve the conversion rate and reaction efficiency of the smelting reduction, in a preferred embodiment, the oxygen content of the oxygen-enriched air is 40-70% by volume, and the reaction temperature during the smelting reduction is 1250-1350 ℃.
The fuel and reductant employed in the above process may be of the type commonly used in the pyrometallurgical arts, and in a preferred embodiment, the above fuel includes, but is not limited to, one or more of natural gas, liquefied petroleum gas, pulverized coal, and coke breeze; reducing agents include, but are not limited to, one or more of carbon monoxide, pulverized coal, granulated coal, waste graphite electrode blocks, coke particles; more preferably, the addition amount of the reducing agent is 10-30% of the weight of the manganese ore.
In order to further improve the melting reaction efficiency and the conversion rate of the manganese ores, in a preferred embodiment, a fusing agent is simultaneously added into a molten pool of the side-blown submerged combustion smelting furnace during the melting reduction process; preferably, the fusing agent is one or more of quartz sand, gangue, quartz stone, limestone and dolomite. By using these fluxes, the high valence manganese is reduced to low valence oxide in the reduction process, in MnO form, with SiO in the flux2Formation of Mn2SiO4And then the manganese-rich slag is added.
In a preferred embodiment, the method further comprises, before the step of feeding the flux and the manganese ore to the side-blown submerged combustion smelting furnace, the step of pelletizing the mixture of flux and manganese ore; preferably, the granulation step is carried out by forming the mixture into a mass having a particle size of less than 10 cm. The technical scheme of preparing the manganese-rich slag by using the side-blown submerged combustion smelting furnace has no special limitation on the feed particle size of manganese ore, and the particle size is smaller than 10 cm.
In a preferred embodiment, when the moisture content of the material is equal to or more than 15 wt%, the method further comprises the step of drying the material to a moisture content of less than 15 wt% before the step of feeding the material to the side-blown submerged combustion smelting furnace. This can further improve the effect of the melting reduction.
In a preferred embodiment, m (CaO + MgO)/m (SiO) in the manganese-rich slag is controlled during the smelting reduction process2) Less than or equal to 0.4. The control of the slag type is more beneficial to improving the smelting effect of the molten pool.
In a preferred embodiment, the method further comprises the step of casting the manganese-rich slag. After being cast, the manganese-rich slag can be directly packed for sale.
In a preferred embodiment, flue gas is obtained in the melting reduction process, and the method further comprises the step of recovering waste heat of the flue gas; preferably, after the step of recovering the waste heat, the method further comprises the step of performing dust removal treatment on the flue gas. Thus being more beneficial to improving the green environmental protection property of the method.
Specifically, the following method can be used: the method comprises the following steps that smoke generated in the smelting process enters an ascending flue of the waste heat boiler, the temperature of the smoke at the outlet of the ascending flue is about 750-800 ℃, the temperature of the smoke after passing through a convection area of the waste heat boiler is reduced to about 350 ℃, and the smoke enters an electric dust collector. The smoke and dust obtained by the waste heat boiler and the electric dust collector are conveyed to a semi-finished product warehouse by air force to be stocked and sold. And the flue gas discharged from the electric dust collector is sent to a flue gas desulfurization system. And stopping feeding when the slag in the side-blown submerged combustion smelting furnace is accumulated to a certain amount, carrying out slag and iron discharging operation, and taking out the obtained manganese-rich slag after the slag is cast in a slag pan and the pig iron is cast in an iron mold.
The beneficial effects of the present invention are further illustrated by the following examples:
example 1
The manganese-rich slag preparation device shown in FIG. 1 is used for treating manganese ore to prepare manganese-rich slag, and specifically:
the smelting area of the side-blown submerged combustion smelting furnace is 15m24 powder-spraying and carburising spray guns and 10 side-blowing spray guns are arranged around the furnace. The manganese ore composition is shown in table 1, and the calcite composition is shown in table 2. Manganese ore and calcite are uniformly mixed according to the mass ratio of 100:7, and particles with the particle size of 5cm are prepared. The prepared granules were charged into a furnace at a feed rate of 20t/h, and oxygen-enriched air (10000 Nm/h) having an oxygen-enriched concentration of 45% was injected into the furnace through 6 side-blown spray guns3H) and natural gas (1700 Nm)3And h), spraying reducing agent pulverized coal into the furnace by 4 side-blowing spray guns (the spraying amount is 1.8 t/h). After the materials are melted and liquid iron is formed, powder recarburization is sprayed into the liquid iron layer through 4 powder spraying recarburization spray guns (the spraying amount is 0.2 t/h).
During smelting, the temperature in the furnace is controlled to be 1250 ℃, and the side-blown furnace can carry out slag and iron discharging operations after smelting for 3 hours. The manganese-rich slag and pig iron contained m (CaO + MgO)/m (SiO) in the manganese-rich slag are shown in tables 3 and 4, respectively2) The recovery rate of manganese in the manganese-rich slag can reach 90 percent when the manganese content is 0.31. The smoke dust generated in the smelting process is recovered by a waste heat boiler and an electric dust collecting device, and the smoke gas is treated by a desulfurization system and is discharged after reaching the standard.
TABLE 1 analysis of manganese ore composition
| Mn | Fe | P | SiO2 | CaO | MgO | Al2O3 |
| 25.12 | 21.95 | 0.19 | 18.95 | 1.35 | 0.8 | 7.05 |
TABLE 3 manganese-rich slag composition
| MnO | FeO | P2O5 | SiO2 | CaO | MgO | Al2O3 |
| 45.42 | 1.34 | 0.028 | 31.60 | 7.58 | 2.31 | 11.72 |
TABLE 4 pig iron composition
| Mn | Fe | P | Si | C |
| 5.54 | 88.20 | 0.80 | 0.52 | 4.94 |
Example 2
The manganese-rich slag preparation device shown in FIG. 1 is used for treating manganese ore to prepare manganese-rich slag, and specifically:
the smelting area of the side-blown submerged combustion smelting furnace is 15m24 powder-spraying and carburising spray guns and 10 side-blowing spray guns are arranged around the furnace. The manganese ore composition is shown in table 1, and the calcite composition is shown in table 2. Manganese ore and calcite are uniformly mixed according to the mass ratio of 100:3 to prepare particles with the particle size of 3 cm. The prepared granules were fed into the furnace at a feed rate of 20t/h, while 6 side-blowing lances directed into the furnaceOxygen-enriched air (10000 Nm) with oxygen-enriched concentration of 50 percent is injected into the nozzle3H) and natural gas (1800 Nm)3And h), spraying reducing agent pulverized coal into the furnace by 4 side-blowing spray guns (the spraying amount is 2 t/h). After the materials are melted and liquid iron is formed, powder recarburization is sprayed into the liquid iron layer through 4 powder spraying recarburization spray guns (the spraying amount is 0.1 t/h).
During smelting, the temperature in the furnace is controlled to be maintained at 1300 ℃, and the side blowing furnace can carry out slag and iron discharging operation after smelting for 3 hours. The manganese-rich slag and pig iron contained m (CaO + MgO)/m (SiO) in the manganese-rich slag are shown in tables 5 and 6, respectively2) The recovery rate of manganese in the manganese-rich slag can reach 93 percent when the manganese content is 0.20. The smoke dust generated in the smelting process is recovered by a waste heat boiler and an electric dust collecting device, and the smoke gas is treated by a desulfurization system and is discharged after reaching the standard.
TABLE 5 manganese-rich slag composition
| MnO | FeO | P2O5 | SiO2 | CaO | MgO | Al2O3 |
| 48.55 | 0.38 | 0.037 | 32.07 | 4.61 | 1.78 | 12.57 |
TABLE 6 pig iron composition
| Mn | Fe | P | Si | C |
| 3.77 | 92.01 | 0.60 | 0.52 | 3.1 |
Comparative example 1
Crushing manganese ore to about 5mm, crushing metallurgical coke to 80mm, mixing the manganese ore and the coke according to the mass ratio of 100:20, sintering and granulating, and adding the granulated material into a blast furnace for smelting. After smelting at 1300 ℃, the MnO content in the produced manganese-rich slag is 42.34 percent, and the FeO content is 3.04 percent. The recovery rate of manganese in the manganese-rich slag is only 85%, and the content of Fe is high, so that the manganese-rich slag is not beneficial to producing the silicon-manganese alloy as a raw material in the later period. In addition, the concentration of the smoke dust generated in the smelting process of the blast furnace method is higher, and the environment-friendly emission is easy to meet the standards.
From the above description, it can be seen that the above-described embodiments of the present invention achieve the following technical effects:
1. the blast furnace method for smelting the manganese-rich slag must adopt coke with high price, and the side-blown smelting process can use a cheaper reducing agent as a raw material;
2. when the blast furnace method is used for smelting manganese ore, the recovery rate of manganese is only about 85 percent; when the side-blown smelting process is used for smelting manganese ore, the recovery rate of manganese can reach more than 90%;
3. the environment-friendly pressure in the smelting process of the blast furnace method is high, the concentration of smelting smoke dust is high, and the environment-friendly emission requirement is often not met; the flue gas generated by the side-blown smelting process meets the environmental protection requirement and can be safely discharged.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. The preparation device of the manganese-rich slag is characterized by comprising the following components:
the side-blown submerged combustion smelting furnace (10) is provided with a manganese ore inlet, and the side-blown submerged combustion smelting furnace (10) is used for melting and reducing manganese ore under the action of oxygen-enriched air, fuel and a reducing agent to generate manganese-enriched slag; a spray hole is formed in the side wall of the side-blown submerged combustion smelting furnace (10);
at least one side-blowing lance for injecting the oxygen-enriched air, the fuel and the reductant through the injection holes into a molten bath inside the side-blowing submerged combustion smelting furnace (10).
2. The apparatus of claim 1, further comprising:
a blowing system (20);
and the powder injection recarburization spray gun is connected with an outlet of the injection system (20), and is used for injecting carbon powder to a liquid iron layer in a molten pool in the side-blown submerged combustion smelting furnace (10) through the spray holes.
3. The arrangement according to claim 1 or 2, characterized by a pelletizing unit (30), the pelletizing unit (30) being provided with a pellet outlet for pelletizing the mixture of manganese ore and flux, the pellet outlet being connected with the manganese ore inlet of the side-blown submerged combustion smelting furnace (10).
4. The apparatus according to claim 3, characterized in that it further comprises a dosing unit (40), said dosing unit (40) being connected to said granulation unit (30) for mixing said manganese ore and said flux to obtain said mixture.
5. An arrangement according to claim 1, characterized in that the side-blown submerged combustion smelting furnace (10) is further provided with a manganese-rich slag outlet, the arrangement further comprising an ingot unit (50), the ingot unit (50) being connected to the manganese-rich slag outlet for the purpose of ingot the manganese-rich slag.
6. An arrangement according to claim 5, characterized in that the side-blown submerged combustion smelting furnace (10) is also provided with a flue gas outlet; the device also comprises a waste heat boiler (60), wherein the waste heat boiler (60) is provided with a heat medium inlet and a heat medium outlet, and the heat medium inlet is connected with the smoke outlet.
7. The device according to claim 6, further comprising a dust removal unit (70), wherein the dust removal unit (70) is connected with the heat medium outlet and is used for performing dust removal treatment on the flue gas discharged from the heat medium outlet.
8. The device according to claim 7, characterized in that the dust removing unit (70) is an electric dust collector or a bag-type dust collector.
9. The apparatus according to claim 7, further comprising a desulfurization unit (80), wherein the desulfurization unit (80) is connected with the gas phase outlet of the dust removal unit (70) and is used for performing desulfurization treatment on the flue gas discharged from the gas phase outlet.
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