CN113999947A - Additive for separating slag iron of high-aluminum iron ore smelting and separation method - Google Patents
Additive for separating slag iron of high-aluminum iron ore smelting and separation method Download PDFInfo
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- CN113999947A CN113999947A CN202111290345.1A CN202111290345A CN113999947A CN 113999947 A CN113999947 A CN 113999947A CN 202111290345 A CN202111290345 A CN 202111290345A CN 113999947 A CN113999947 A CN 113999947A
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 342
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 171
- 239000002893 slag Substances 0.000 title claims abstract description 57
- 239000000654 additive Substances 0.000 title claims abstract description 50
- 238000003723 Smelting Methods 0.000 title claims abstract description 49
- 230000000996 additive effect Effects 0.000 title claims abstract description 38
- 238000000926 separation method Methods 0.000 title claims abstract description 22
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 49
- 239000011707 mineral Substances 0.000 claims abstract description 49
- 230000009467 reduction Effects 0.000 claims abstract description 45
- 238000000034 method Methods 0.000 claims abstract description 41
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims abstract description 36
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 36
- 239000011572 manganese Substances 0.000 claims abstract description 36
- AMWRITDGCCNYAT-UHFFFAOYSA-L hydroxy(oxo)manganese;manganese Chemical compound [Mn].O[Mn]=O.O[Mn]=O AMWRITDGCCNYAT-UHFFFAOYSA-L 0.000 claims abstract description 34
- 229910000616 Ferromanganese Inorganic materials 0.000 claims abstract description 10
- DALUDRGQOYMVLD-UHFFFAOYSA-N iron manganese Chemical compound [Mn].[Fe] DALUDRGQOYMVLD-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000003638 chemical reducing agent Substances 0.000 claims description 54
- 239000004484 Briquette Substances 0.000 claims description 51
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 34
- 239000011230 binding agent Substances 0.000 claims description 27
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 18
- 229910052799 carbon Inorganic materials 0.000 claims description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 18
- 238000001035 drying Methods 0.000 claims description 13
- 238000002844 melting Methods 0.000 claims description 11
- 230000008018 melting Effects 0.000 claims description 11
- 150000001408 amides Chemical class 0.000 claims description 7
- 239000002802 bituminous coal Substances 0.000 claims description 7
- 229920002554 vinyl polymer Polymers 0.000 claims description 7
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims description 4
- DPXJVFZANSGRMM-UHFFFAOYSA-N acetic acid;2,3,4,5,6-pentahydroxyhexanal;sodium Chemical compound [Na].CC(O)=O.OCC(O)C(O)C(O)C(O)C=O DPXJVFZANSGRMM-UHFFFAOYSA-N 0.000 claims description 4
- 239000001768 carboxy methyl cellulose Substances 0.000 claims description 4
- 239000003610 charcoal Substances 0.000 claims description 4
- 239000000571 coke Substances 0.000 claims description 4
- 239000011734 sodium Substances 0.000 claims description 4
- 229910052708 sodium Inorganic materials 0.000 claims description 4
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 claims description 4
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 claims description 4
- 239000002245 particle Substances 0.000 claims description 3
- 238000011084 recovery Methods 0.000 abstract description 10
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 abstract description 8
- 238000001465 metallisation Methods 0.000 abstract description 8
- KCZFLPPCFOHPNI-UHFFFAOYSA-N alumane;iron Chemical compound [AlH3].[Fe] KCZFLPPCFOHPNI-UHFFFAOYSA-N 0.000 abstract description 5
- 229910052751 metal Inorganic materials 0.000 abstract description 5
- 239000002184 metal Substances 0.000 abstract description 5
- 229910000831 Steel Inorganic materials 0.000 abstract description 4
- 238000003912 environmental pollution Methods 0.000 abstract description 4
- 239000010959 steel Substances 0.000 abstract description 4
- 229910052840 fayalite Inorganic materials 0.000 abstract description 3
- 229910001691 hercynite Inorganic materials 0.000 abstract description 3
- 238000011946 reduction process Methods 0.000 abstract description 3
- 230000000052 comparative effect Effects 0.000 description 8
- 230000008569 process Effects 0.000 description 7
- 239000008188 pellet Substances 0.000 description 5
- 229910052782 aluminium Inorganic materials 0.000 description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- 230000002411 adverse Effects 0.000 description 2
- 229910052593 corundum Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910001845 yogo sapphire Inorganic materials 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 229910052905 tridymite Inorganic materials 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
- C21B13/008—Use of special additives or fluxing agents
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention provides an additive for separating high-aluminum iron ore smelting slag from iron and a separation method, wherein the additive comprises at least one of manganese oxide, ferromanganese ore, manganese-rich slag and electrolytic manganese anode mud. According to the separation method, the manganese-containing mineral is used as an additive for pre-reduction-smelting reduction iron-aluminum separation of the high-aluminum iron ore, and the manganese oxide in the manganese-containing mineral is used for replacing iron oxide in hercynite and fayalite generated in the reduction process of the high-aluminum iron ore, so that the direct reduction metallization rate of the high-aluminum iron ore is effectively improved; the smelting reduction temperature of the high-aluminum iron ore pre-reduced block mass is reduced by using the manganese-containing minerals, the viscosity of a slag phase can be reduced by using the manganese-containing minerals, the fluidity of the slag phase is improved, the effective separation of slag and iron is promoted, the metal recovery rate is improved, the environmental pollution is small, and the method has important practical significance for efficiently using the high-aluminum iron ore, relieving the pressure of shortage of high-quality iron ore resources in China, reducing the high dependence of the iron and steel industry on overseas resources and realizing the comprehensive utilization of mineral resources.
Description
Technical Field
The invention relates to the technical field of iron making, in particular to an additive for separating smelting slag and iron of a high-alumina iron ore and a separation method.
Background
The high-aluminum iron ore is one of the typical low-grade iron ores which are complex and difficult to process and utilize in China, and the high-aluminum iron ore is Al2O3The content is high, the method can not be directly used for smelting molten iron in a blast furnace, and the method can generate adverse effect on the product quality when used for preparing blast furnace burden, and the fuel energy consumption is increased. Therefore, the utilization rate is low at present. The iron-aluminum separation is a key means for realizing the high-efficiency utilization of the high-aluminum iron ore, iron and aluminum in the high-aluminum iron ore often form a homogeneous structure, the iron and aluminum can not be fully separated by the conventional mineral separation method, and the current research results show that the means for realizing the iron-aluminum separation are numerous, a large amount of additives are required to be added in the realization process of most process methods, so that the increase of the production cost and the adverse effect on the smooth operation of equipment are caused, and the economical efficiency is poor. The reduction method treatment process can efficiently and quickly realize iron-aluminum separation of the high-aluminum iron ore, but a certain amount of additives are more or less required to be added in the process, or the iron oxide is reduced and melted at the high temperature of 1550-1600 ℃ to separate iron slag in a liquid state. The additive or high temperature can increase the production and treatment cost, and meanwhile, the long-term stable operation of the kiln is not facilitated. Because the content of aluminum in the high-aluminum iron ore is higher, the viscosity of a slag phase in the smelting reduction iron-making process is higher, the melting temperature is improved, the fluidity is poor, and the slag-iron separation efficiency is reduced.
Therefore, the development of the additive which reduces the melting temperature in the reduction iron-making process, promotes the effective separation of iron slag, has high metal recovery rate and little environmental pollution has important practical significance for efficiently utilizing the high-alumina iron ore, relieving the pressure of the shortage of high-quality iron ore resources in China, reducing the high dependence of the iron and steel industry on overseas resources and realizing the comprehensive utilization of mineral resources.
Disclosure of Invention
In view of the above, the invention provides an additive for separating iron slag from high-alumina iron ore smelting and a separation method thereof, so as to solve or partially solve the problems in the prior art.
In a first aspect, the invention provides an additive for separating iron from smelting slag of high-alumina iron ore, which comprises at least one of manganese oxide, ferromanganese ore, manganese-rich slag and electrolytic manganese anode mud; the particle size of the additive is 0.005-0.1 mm.
In a second aspect, the invention also provides a method for separating the smelting slag and iron of the high-alumina iron ore, which comprises the following steps:
uniformly mixing iron-containing minerals, the additive, the binder and water, and agglomerating to obtain agglomerates;
adding a reducing agent into the agglomerates, and carrying out pre-reduction roasting to obtain metallized agglomerates;
and adding a reducing agent into the metallized briquette, and carrying out melting reduction roasting to obtain molten iron and manganese-rich tailings.
Preferably, in the method for separating the iron from the high-alumina iron ore smelting slag, the binder comprises at least one of sodium carboxymethyl cellulose, sodium humate or polyvinyl amide.
Preferably, in the method for separating the smelting slag and the iron of the high-alumina iron ore, the reducing agent comprises at least one of bituminous coal, charcoal and coke.
Preferably, in the method for separating the smelting slag and the iron of the high-aluminum iron ore, the temperature of the pre-reduction roasting is 950-1100 ℃ and the time is 60-100 min.
Preferably, the method for separating the smelting slag and the iron of the high-aluminum iron ore has the advantages that the temperature of smelting reduction roasting is 1450-1550 ℃ and the time is 15-40 min.
Preferably, the method for separating the smelting slag and the iron of the high-alumina iron ore comprises the steps of adding a reducing agent into the agglomerates, and drying the agglomerates before carrying out pre-reduction roasting, wherein the drying temperature is 30-200 ℃, and the drying time is 2-4 hours.
Preferably, in the method for separating the smelting slag and the iron of the high-aluminum iron ore, the mass ratio of the iron-containing mineral to the additive is 100 (10-150); the mass sum of the iron-containing minerals and the additive, the mass of the binder and the mass of the water are 100 (0.1-1.5) to 10-25.
Preferably, in the method for separating the smelting slag and the iron of the high-alumina iron ore, in the step of adding a reducing agent into the briquette and carrying out pre-reduction roasting, the mass ratio of carbon contained in the reducing agent to iron contained in the briquette is (1.0-2.0): 1.
Preferably, in the method for separating the smelting slag and the iron of the high-alumina iron ore, in the step of adding a reducing agent into the metallized briquette and carrying out smelting reduction roasting, the mass ratio of carbon contained in the reducing agent to iron contained in the metallized briquette is (1-5): 20.
Compared with the prior art, the additive for separating the smelting slag and the iron of the high-aluminum iron ore and the separation method thereof have the following beneficial effects:
(1) according to the method for separating the smelting slag iron of the high-aluminum iron ore, the manganese-containing mineral is used as an additive for pre-reduction-smelting reduction iron-aluminum separation of the high-aluminum iron ore, and the manganese oxide in the manganese-containing mineral is used for replacing iron oxide in hercynite and fayalite generated in the reduction process of the high-aluminum iron ore, so that the direct reduction metallization rate of the high-aluminum iron ore is effectively improved; the smelting reduction temperature of the high-aluminum iron ore pre-reduced block mass is reduced by using the manganese-containing minerals, the viscosity of a slag phase can be reduced by using the manganese-containing minerals, the fluidity of the slag phase is improved, the effective separation of slag and iron is promoted, the metal recovery rate is improved, the environmental pollution is small, and the method has important practical significance for efficiently using the high-aluminum iron ore, relieving the pressure of shortage of high-quality iron ore resources in China, reducing the high dependence of the iron and steel industry on overseas resources and realizing the comprehensive utilization of mineral resources.
Detailed Description
In the following, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
The embodiment of the application provides an additive for separating slag and iron in smelting of high-alumina iron ore, which comprises at least one of manganese oxide, ferromanganese ore, manganese-rich slag and electrolytic manganese anode mud; the particle size of the additive is 0.005-0.1 mm.
Specifically, the mass content of manganese oxide in the electrolytic manganese anode mud is 63-87%;
the mass content of manganese oxide in the ferromanganese ore is 8-16%;
the mass content of the manganese oxide in the manganese-rich slag is 47-71%.
Based on the same inventive concept, the embodiment of the application also provides a method for separating the smelting slag and iron of the high-alumina iron ore, which comprises the following steps:
s1, uniformly mixing the iron-containing mineral, the additive, the binder and water, and agglomerating to obtain a briquette;
s2, adding a reducing agent into the briquette, and carrying out pre-reduction roasting to obtain a metallized briquette;
and S3, adding a reducing agent into the metallized briquette, and carrying out melting reduction roasting to obtain molten iron and manganese-rich tailings.
It should be noted that in the method for separating iron from molten slag of a high-alumina iron ore in the embodiment of the present application, a manganese-containing mineral is used as an additive for pre-reduction-smelting reduction of iron and aluminum in the high-alumina iron ore, and a manganese oxide in the manganese-containing mineral is used to replace ferrous oxide in hercynite and fayalite generated in the reduction process of the high-alumina iron ore, so as to effectively improve the direct reduction metallization rate of the high-alumina iron ore; the smelting reduction temperature of the high-aluminum iron ore pre-reduced block mass is reduced by using the manganese-containing minerals, the viscosity of a slag phase can be reduced by using the manganese-containing minerals, the fluidity of the slag phase is improved, the effective separation of slag and iron is promoted, the metal recovery rate is improved, the environmental pollution is small, and the method has important practical significance for efficiently using the high-aluminum iron ore, relieving the pressure of shortage of high-quality iron ore resources in China, reducing the high dependence of the iron and steel industry on overseas resources and realizing the comprehensive utilization of mineral resources.
Specifically, the iron-containing mineral is high-aluminum iron ore.
In some embodiments, the binder comprises at least one of sodium carboxymethyl cellulose, sodium humate, or polyvinyl amide.
In some embodiments, the reductant comprises at least one of bituminous coal, charcoal, coke.
In some embodiments, the pre-reduction roasting temperature is 950-1100 ℃ and the time is 60-100 min.
In some embodiments, the temperature of the smelting reduction roasting is 1450-1550 ℃ and the time is 15-40 min.
In some embodiments, the reducing agent is added into the agglomerates, and the agglomerates are dried before the pre-reduction roasting, wherein the drying temperature is 30-200 ℃, and the drying time is 2-4 hours.
In some embodiments, the mass ratio of the iron-containing mineral to the additive is 100 (10-150); the mass sum of the iron-containing minerals and the additive, the mass of the binder and the mass of the water are 100 (0.1-1.5) to 10-25.
In some embodiments, in the step of adding a reducing agent to the briquette and performing pre-reduction roasting, the mass ratio of carbon contained in the reducing agent to iron contained in the briquette is (1.0-2.0): 1.
In some embodiments, in the step of adding the reducing agent to the metallized briquette and performing the smelting reduction roasting, the mass ratio of carbon contained in the reducing agent to iron contained in the metallized briquette is (1-5): 20.
The slag iron separation method for the high-alumina iron ore smelting of the present application is further described below with specific examples. The iron-containing minerals used in the following examples and comparative examples were 41.92% TFe content of raw ore and Al2O3Content of 13.74% SiO213.96 percent of high-aluminum iron ore, 0.13 percent of CaO, 0.88 percent of MgO, 7.20 percent of burning loss and other inevitable impurities, wherein the contents are all mass contents.
Example 1
The embodiment of the application provides a method for separating smelting slag and iron of a high-alumina iron ore, which comprises the following steps:
s1, uniformly mixing the iron-containing minerals, the additive, the binder and water, and agglomerating to obtain agglomerates;
s2, drying the blocks at 150 ℃ for 3h to obtain dried blocks;
s3, adding a reducing agent into the briquette, and carrying out pre-reduction roasting at 1050 ℃ for 90min to obtain a metallized briquette;
s4, adding a reducing agent into the metallized briquette, and carrying out melting reduction roasting for 20min at the temperature of 1450 ℃ to obtain molten iron and manganese-rich tailings;
wherein the additive is electrolytic manganese anode mud, and the mass content of manganese oxide in the electrolytic manganese anode mud is 70%;
the binder is polyvinyl amide, and the reducing agent is bituminous coal;
the mass ratio of the iron-containing minerals to the additives is 8:1, and the mass ratio of the sum of the iron-containing minerals and the additives to the mass of the binder to the mass of the water is 100:1: 15;
the mass ratio of carbon contained in the reducing agent to iron contained in the briquette in step S3 is 1.5: 1;
the mass ratio of carbon contained in the reducing agent to iron contained in the metallized briquette in step S4 was 1: 10.
Example 2
The embodiment of the application provides a method for separating smelting slag and iron of a high-alumina iron ore, which comprises the following steps:
s1, uniformly mixing the iron-containing minerals, the additive, the binder and water, and agglomerating to obtain agglomerates;
s2, drying the block mass at 180 ℃ for 3h to obtain a dried block mass;
s3, adding a reducing agent into the briquette, and carrying out pre-reduction roasting for 60min at the temperature of 1150 ℃ to obtain a metallized briquette;
s4, adding a reducing agent into the metallized briquette, and carrying out melting reduction roasting for 15min at the temperature of 1450 ℃ to obtain molten iron and manganese-rich tailings;
wherein the additive is ferromanganese ore, and the mass content of manganese oxide in the ferromanganese ore is 10 percent;
the binder is sodium carboxymethyl cellulose, and the reducing agent is coke;
the mass ratio of the iron-containing minerals to the additives is 1:1, and the mass ratio of the sum of the iron-containing minerals and the additives to the mass of the binder to the mass of the water is 100:0.5: 15;
the mass ratio of carbon contained in the reducing agent to iron contained in the briquette in step S3 is 1.2: 1;
the mass ratio of carbon contained in the reducing agent to iron contained in the metallized briquette in step S4 was 1: 12.
Example 3
The embodiment of the application provides a method for separating smelting slag and iron of a high-alumina iron ore, which comprises the following steps:
s1, uniformly mixing the iron-containing minerals, the additive, the binder and water, and agglomerating to obtain agglomerates;
s2, drying the block mass for 3h at 120 ℃ to obtain a dried block mass;
s3, adding a reducing agent into the briquette, and carrying out pre-reduction roasting for 100min at the temperature of 1000 ℃ to obtain a metallized briquette;
s4, adding a reducing agent into the metallized briquette, and carrying out melting reduction roasting for 25min at the temperature of 1500 ℃ to obtain molten iron and manganese-rich tailings;
wherein the additive is manganese-rich slag, and the mass content of manganese oxide in the manganese-rich slag is 60%;
the binder is sodium humate, and the reducing agent is charcoal;
the mass ratio of the iron-containing minerals to the additives is 7:3, and the mass sum of the iron-containing minerals and the additives, the mass of the binder and the mass ratio of water are 100:1: 15;
the mass ratio of carbon contained in the reducing agent to iron contained in the briquette in step S3 is 2: 1;
the mass ratio of carbon contained in the reducing agent to iron contained in the metallized briquette in step S4 was 1: 15.
Example 4
The embodiment of the application provides a method for separating smelting slag and iron of a high-alumina iron ore, which comprises the following steps:
s1, uniformly mixing the iron-containing minerals, the additive, the binder and water, and agglomerating to obtain agglomerates;
s2, drying the block mass at 180 ℃ for 3h to obtain a dried block mass;
s3, adding a reducing agent into the briquette, and carrying out pre-reduction roasting at 1050 ℃ for 90min to obtain a metallized briquette;
s4, adding a reducing agent into the metallized briquette, and carrying out melting reduction roasting for 20min at the temperature of 1450 ℃ to obtain molten iron and manganese-rich tailings;
wherein the additive is manganese oxide, the binder is polyvinyl amide, and the reducing agent is bituminous coal;
the mass ratio of the iron-containing minerals to the additives is 10:1, and the mass ratio of the sum of the iron-containing minerals and the additives to the mass of the binder to the mass of the water is 100:1: 15;
the mass ratio of carbon contained in the reducing agent to iron contained in the briquette in step S3 is 1.5: 1;
the mass ratio of carbon contained in the reducing agent to iron contained in the metallized briquette in step S4 was 1: 18.
Example 5
The embodiment of the application provides a method for separating smelting slag and iron of a high-alumina iron ore, which comprises the following steps:
s1, uniformly mixing the iron-containing minerals, the additive, the binder and water, and agglomerating to obtain agglomerates;
s2, drying the block mass at 180 ℃ for 3h to obtain a dried block mass;
s3, adding a reducing agent into the briquette, and carrying out pre-reduction roasting at 1050 ℃ for 90min to obtain a metallized briquette;
s4, adding a reducing agent into the metallized briquette, and carrying out melting reduction roasting for 20min at the temperature of 1450 ℃ to obtain molten iron and manganese-rich tailings;
wherein the additive is ferromanganese ore and manganese oxide, the mass ratio of the ferromanganese ore to the manganese oxide is 4:1, and the mass content of manganese oxide in the ferromanganese ore is 12%; the binder is polyvinyl amide, and the reducing agent is bituminous coal;
the mass ratio of the iron-containing minerals to the additives is 6:4, and the mass ratio of the sum of the iron-containing minerals and the additives to the mass of the binder to the mass of the water is 100:1: 15;
the mass ratio of carbon contained in the reducing agent to iron contained in the briquette in step S3 is 1.5: 1;
the mass ratio of carbon contained in the reducing agent to iron contained in the metallized briquette in step S4 was 1: 18.
Comparative example 1
The comparative example provides a method for separating slag and iron in smelting of high-alumina iron ore, which comprises the following steps:
s1, uniformly mixing the iron-containing mineral, the binder and water, and agglomerating to obtain a briquette;
s2, drying the blocks at 150 ℃ for 3h to obtain dried blocks;
s3, adding a reducing agent into the briquette, and carrying out pre-reduction roasting at 1050 ℃ for 90min to obtain a metallized briquette;
s4, adding a reducing agent into the metallized briquette, and carrying out melting reduction roasting for 30min at the temperature of 1500 ℃ to obtain molten iron and manganese-rich tailings;
the binder is polyvinyl amide, and the reducing agent is bituminous coal;
the mass ratio of the iron-containing mineral to the binder to the water is 100:1: 15:
the mass ratio of carbon contained in the reducing agent to iron contained in the briquette in step S3 is 1.5: 1;
the mass ratio of carbon contained in the reducing agent to iron contained in the metallized briquette in step S4 was 1: 10.
Performance testing
According to the method for separating the smelting slag and iron of the high-alumina iron ore in the examples 1 to 4 and the comparative example 1, the metallization rate of the metallized pellets, the iron grade of the molten iron and the iron recovery rate are tested, and the results are shown in the following table 1.
TABLE 1 metallization ratio of metallized pellets of different examples, iron grade of molten iron and iron recovery
| Examples | Metallization ratio (%) | Grade of iron (%) | Iron recovery (%) |
| Example 1 | 87.1 | 97.6 | 86.45 |
| Example 2 | 85.62 | 97.8 | 88.32 |
| Example 3 | 87.26 | 98.6 | 91.25 |
| Example 4 | 90.27 | 96.38 | 90.24 |
| Example 5 | 88.72 | 97.26 | 90.38 |
| Comparative example 1 | 66.49 | 96.68 | 74.49 |
In table 1, the metallization ratio is equal to the metallic iron content/total iron content in the iron-containing minerals (the metallic iron content refers to the content of elemental iron in the iron-containing mineral sample, and the total iron content refers to the content of all iron elements in the iron-containing mineral sample); the metallized pellet refers to the metallized briquette in the step S3 of the above example and comparative example, which represents the degree to which the briquette is reduced; the iron grade refers to the mass content of the iron element in the molten iron in the step S4 of the above examples and comparative examples; the calculation method of the iron recovery rate comprises the following steps: the mass of iron in the molten iron/the mass of iron in the metallized pellet.
As can be seen from Table 1, the metallization ratio of the metallized pellets, the iron grade of the molten iron and the iron recovery rate are all higher than those of the comparative example by adopting the separation method, which shows that the metal recovery rate can be improved by adding the manganese-containing mineral as an additive in the separation process of the smelting slag iron of the high-alumina iron ore.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. The additive for separating the smelting slag and iron of the high-aluminum iron ore is characterized by comprising at least one of manganese oxide, ferromanganese ore, manganese-rich slag and electrolytic manganese anode mud; the particle size of the additive is 0.005-0.1 mm.
2. A method for separating slag and iron in smelting of high-aluminum iron ore is characterized by comprising the following steps:
uniformly mixing the iron-containing mineral, the additive, the binder and water according to claim 1, and agglomerating to obtain an agglomerate;
adding a reducing agent into the agglomerates, and carrying out pre-reduction roasting to obtain metallized agglomerates;
and adding a reducing agent into the metallized briquette, and carrying out melting reduction roasting to obtain molten iron and manganese-rich tailings.
3. The high-alumina iron ore smelting slag iron separation method according to claim 2, wherein the binder includes at least one of sodium carboxymethyl cellulose, sodium humate, or polyvinyl amide.
4. The method of claim 2, wherein the reductant comprises at least one of bituminous coal, charcoal, and coke.
5. The method for separating the slag and the iron in the smelting of the high-alumina iron ore according to claim 2, wherein the temperature of the pre-reduction roasting is 950 to 1100 ℃ and the time is 60 to 100 min.
6. The method for separating the slag and the iron in the smelting of the high-alumina iron ore according to claim 2, wherein the temperature of the smelting reduction roasting is 1450 to 1550 ℃ and the time is 15 to 40 min.
7. The method for separating the slag and the iron from the high-alumina iron ore smelting according to claim 2, wherein a reducing agent is added into the agglomerates, and the agglomerates are dried before the pre-reduction roasting, wherein the drying temperature is 30-200 ℃, and the drying time is 2-4 hours.
8. The method for separating the slag and the iron in the high-alumina iron ore smelting according to claim 2, wherein the mass ratio of the iron-containing mineral to the additive is 100 (10-150); the mass sum of the iron-containing minerals and the additive, the mass of the binder and the mass of the water are 100 (0.1-1.5) to 10-25.
9. The method for separating the molten slag and iron of the high-alumina iron ore according to claim 2, wherein in the step of adding a reducing agent to the briquette and performing pre-reduction roasting, the mass ratio of carbon contained in the reducing agent to iron contained in the briquette is (1.0-2.0): 1.
10. The method for separating the molten slag and iron from the high-alumina iron ore according to claim 2, wherein in the step of adding a reducing agent to the metallized briquette and performing the smelting reduction roasting, the mass ratio of carbon contained in the reducing agent to iron contained in the metallized briquette is (1-5): 20.
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| CN102168156A (en) * | 2011-03-29 | 2011-08-31 | 东北大学 | Iron and aluminum melting separation method for complicated and hard-dressing aluminum and iron intergrowth ore |
| CN102732662A (en) * | 2012-06-02 | 2012-10-17 | 胡长春 | Slag-free production process using bauxite or red mud |
| CN112159895A (en) * | 2020-09-24 | 2021-01-01 | 武汉科技大学 | Composite additive and method for strengthening direct reduction of red mud and preparation method of composite additive |
| CN112251601A (en) * | 2020-09-24 | 2021-01-22 | 武汉科技大学 | Method for recovering iron by strengthening red mud reduction of manganese-containing minerals |
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2021
- 2021-11-02 CN CN202111290345.1A patent/CN113999947A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102168156A (en) * | 2011-03-29 | 2011-08-31 | 东北大学 | Iron and aluminum melting separation method for complicated and hard-dressing aluminum and iron intergrowth ore |
| CN102732662A (en) * | 2012-06-02 | 2012-10-17 | 胡长春 | Slag-free production process using bauxite or red mud |
| CN112159895A (en) * | 2020-09-24 | 2021-01-01 | 武汉科技大学 | Composite additive and method for strengthening direct reduction of red mud and preparation method of composite additive |
| CN112251601A (en) * | 2020-09-24 | 2021-01-22 | 武汉科技大学 | Method for recovering iron by strengthening red mud reduction of manganese-containing minerals |
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