CN113416839A - Iron-containing low-silicon binder and preparation method thereof - Google Patents
Iron-containing low-silicon binder and preparation method thereof Download PDFInfo
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- CN113416839A CN113416839A CN202110689279.9A CN202110689279A CN113416839A CN 113416839 A CN113416839 A CN 113416839A CN 202110689279 A CN202110689279 A CN 202110689279A CN 113416839 A CN113416839 A CN 113416839A
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- China
- Prior art keywords
- iron
- parts
- binder
- silicon
- containing low
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 129
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 60
- 229910052710 silicon Inorganic materials 0.000 title claims abstract description 40
- 239000010703 silicon Substances 0.000 title claims abstract description 40
- 239000011230 binding agent Substances 0.000 title claims abstract description 35
- 238000002360 preparation method Methods 0.000 title abstract description 6
- 239000008188 pellet Substances 0.000 claims abstract description 41
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims abstract description 38
- 239000000440 bentonite Substances 0.000 claims abstract description 26
- 229910000278 bentonite Inorganic materials 0.000 claims abstract description 26
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims abstract description 26
- 238000000034 method Methods 0.000 claims abstract description 16
- 239000000203 mixture Substances 0.000 claims abstract description 14
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 10
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000000853 adhesive Substances 0.000 claims abstract description 4
- 230000001070 adhesive effect Effects 0.000 claims abstract description 4
- 239000002994 raw material Substances 0.000 claims description 13
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 13
- 229920002134 Carboxymethyl cellulose Polymers 0.000 claims description 11
- 239000001768 carboxy methyl cellulose Substances 0.000 claims description 11
- 235000010948 carboxy methyl cellulose Nutrition 0.000 claims description 11
- 239000008112 carboxymethyl-cellulose Substances 0.000 claims description 11
- 239000000377 silicon dioxide Substances 0.000 claims description 9
- 229910052681 coesite Inorganic materials 0.000 claims description 8
- 229910052906 cristobalite Inorganic materials 0.000 claims description 8
- 238000002156 mixing Methods 0.000 claims description 8
- 229910052682 stishovite Inorganic materials 0.000 claims description 8
- 229910052905 tridymite Inorganic materials 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 6
- 239000000843 powder Substances 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 239000013078 crystal Substances 0.000 claims description 3
- 238000000227 grinding Methods 0.000 claims description 3
- 238000007873 sieving Methods 0.000 claims description 3
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 claims description 2
- 238000004806 packaging method and process Methods 0.000 claims description 2
- 230000008569 process Effects 0.000 abstract description 13
- 238000003723 Smelting Methods 0.000 abstract description 11
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 abstract description 10
- 239000002910 solid waste Substances 0.000 abstract description 9
- 239000000446 fuel Substances 0.000 abstract description 4
- 238000005453 pelletization Methods 0.000 description 10
- 229910000831 Steel Inorganic materials 0.000 description 8
- 239000010959 steel Substances 0.000 description 8
- 239000002131 composite material Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- 238000005265 energy consumption Methods 0.000 description 4
- 235000012239 silicon dioxide Nutrition 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
- 229910001845 yogo sapphire Inorganic materials 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/242—Binding; Briquetting ; Granulating with binders
- C22B1/244—Binding; Briquetting ; Granulating with binders organic
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/2406—Binding; Briquetting ; Granulating pelletizing
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/242—Binding; Briquetting ; Granulating with binders
- C22B1/243—Binding; Briquetting ; Granulating with binders inorganic
Abstract
The invention provides an iron-containing low-silicon binder, a preparation method and application thereof, wherein the iron-containing low-silicon binder comprises the following mixture in parts by weight: composition containing iron element: 30-90 parts of iron-containing composition, wherein the iron-containing composition consists of red mud and/or iron oxide red; adhesive: 1-10 parts; bentonite: 10-60 parts. The iron-containing low-silicon binder prepared by the invention contains iron, can increase the grade of the pellets, can reduce the silicon content of the pellets, can treat red mud, iron oxide red and other solid waste products, can cooperatively treat solid waste resources, can reduce fuel consumption in the blast furnace smelting process, and accords with the characteristics of low carbon, energy saving and economy.
Description
Technical Field
The invention relates to the technical field of steel smelting, in particular to an iron-containing low-silicon binder and a preparation method thereof.
Background
The energy structure of the steel industry in China is mainly coal at present, and the long flow of a blast furnace-converter is dominant in the flow structure, so that the emission of carbon dioxide per ton of steel is at a high level.
Along with the popularization of energy-saving and emission-reducing equipment in the steel industry in recent years, the carbon reduction potential of steel is gradually weakened, so that the development of a low-energy-consumption agglomeration process and the further improvement of the low-carbon smelting effect of a blast furnace become important. The energy consumption of the sintering process in China is 50-60kgce/t, the energy consumption of the pelletizing process is only 20-30kgce/t, and the energy consumption is only 1/2-1/3 level, so that the development of pellet ore, the improvement of the pellet proportion and the reduction of the use proportion of the sinter ore become the main mode for reducing the carbon emission in the long process of steel in future.
The iron ore powder resources in China are limited by monopoly of foreign ore enterprises, and the profit of steel and iron is greatly squeezed, so that the advantages of the mine in China must be developed, and the exploitation of the domestic ore powder resources is urgent. In China, poor iron ores are mainly used, although the total amount of resources is huge, the comprehensive grade is about 35%, the silicon content of iron fine powder is high, and bentonite with higher silicon content is used as a pelletizing adhesive, so that the metallurgical performance of high-silicon pellets is poor, the blast furnace slag ratio is high, the coke consumption is high, and the smelting is not economical, so that the increase of the pellet proportion in China is limited. Therefore, the content of silicon dioxide in the pellets is reduced, and the key factors for improving the quality of the pellets and increasing the proportion of the pellets are achieved.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides an iron-containing low-silicon binder and a preparation method thereof, so as to solve the problems of low pellet grade and high silicon content in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides an iron-containing low-silicon binder, which comprises the following raw materials in parts by weight:
composition containing iron element: 30-90 parts of iron-containing composition, wherein the iron-containing composition consists of red mud and/or iron oxide red;
carboxymethyl cellulose: 1-10 parts;
bentonite: 10-60 parts.
Preferably, the raw materials comprise the following components in parts by weight: 40 parts of red mud, 25 parts of iron oxide red, 5 parts of carboxymethyl cellulose and 30 parts of bentonite.
Preferably, the raw materials comprise the following components in parts by weight: 55 parts of red mud, 5 parts of carboxymethyl cellulose and 40 parts of bentonite.
Preferably, the raw materials comprise the following components in parts by weight: 45 parts of iron oxide red, 5 parts of carboxymethyl cellulose and 50 parts of bentonite.
Preferably, after the raw materials in parts by weight are mixed in proportion, the weight percentage of the iron is controlled to be 20-60%, and SiO2The content is 2-15%.
Preferably, the raw materials are mixed according to the weight part, the weight percentage of iron is controlled to be 30-50%, and SiO2The content is 3-10%In the meantime.
Preferably, the iron-containing grade of the selected red mud is between 30 and 50 percent, and S isiO2The content is between 6 and 10 percent; the iron-containing grade of the iron oxide red is 60-80%.
In another aspect of the present invention, a method for preparing an iron-containing low-silicon binder is provided, which comprises the following steps:
1. heating the composition containing the iron element at a high temperature, increasing the temperature to be more than 300 ℃, and removing crystal water;
2. mixing the composition containing ferric oxide, carboxymethyl cellulose and bentonite according to a certain proportion, grinding to obtain a powder with a fineness of 325 meshes and a sieving rate of more than 90%;
3. and (4) strongly mixing the mixed materials uniformly again, and warehousing or packaging into bags.
In a third aspect of the invention, the use of an iron-containing low-silicon binder for oxidized pellets, direct reduced pellets, cold pressed pellets, carbon-containing pellets is also provided.
Compared with the prior art, the invention has the following beneficial technical effects:
(1) the iron-containing low-silicon binder prepared by the invention contains iron, can increase the grade of the pellets, can reduce the silicon content of the pellets, can treat red mud, iron oxide red and other solid waste products, can cooperatively treat solid waste resources, can reduce fuel consumption in the blast furnace smelting process, and accords with the characteristics of low carbon, energy saving and economy.
Detailed Description
In the present invention, all parts are in weight units and all percentages are in weight percentages, all equipment and raw materials, etc. are commercially available or commonly used in the industry, unless otherwise specified.
The embodiment of the invention aims to develop an iron-containing low-silicon binder product which can completely replace bentonite for green ball preparation. The existing products of bentonite, composite bentonite and the like contain about 60 percent of silicon and basically do not contain iron, and the proportion in the pelletizing process is 1.5 to 3 percent. The iron-containing low-silicon binder product of the invention has the iron content of 20-60% and the silicon content of 3-15%, can completely replace bentonite and composite bentonite products in the pelletizing process, and has the addition proportion of 0.5-2% by weight.
Example one
Mixing red mud and iron oxide red according to a certain proportion to form an iron element mixed material, heating the mixed material to 350 ℃ at high temperature for drying and dehydrating, cooling, and then mixing and adding carboxymethyl cellulose and bentonite, preferably 40 parts of red mud, 25 parts of iron oxide red, 5 parts of carboxymethyl cellulose and 30 parts of bentonite. Wherein, in the iron element mixed material, the iron-containing taste of the red iron is between 30 and 50 percent, and the content of SiO2 is between 6 and 10 percent; the iron-containing grade of the iron oxide red is between 60 and 80 percent, the iron-containing weight percentage is between 20 and 50 percent after mixing, and the content of SiO2 is between 2 and 10 percent.
The red mud containing iron oxide and the iron oxide red belong to industrial solid waste products, can be recycled in a synergistic treatment process, and fully utilize iron-containing substances for pelletizing so as to make iron. Carboxymethyl cellulose has also been used in part in composite binders, but its use viscosity number is 1200mpa.s, whereas carboxymethyl cellulose used in the present invention has no effect on its viscosity number. The bentonite plays a role in regulating the pelletizing speed in the binder process, and compared with the product with the defect of poor pellet quality caused by too high pelletizing speed of the iron-rich composite binder in the prior art, the method can control the pelletizing time, improve the pellet compactness and further improve the pellet quality. Because the iron element is added in the pelletizing process, the grade of the pellets can be increased, meanwhile, the silicon content of the pellets can be reduced due to low silicon, solid waste products such as red mud and the like can be treated, solid waste resources can be treated cooperatively, the fuel consumption can be reduced in the blast furnace smelting process, and the low-carbon energy-saving economical characteristics are met.
Grinding the four mixed materials to obtain a fineness of 325 meshes and a sieving rate of 92-95 percent; and finally, adding water for wetting, uniformly mixing again, performing primary pelletizing on a disc pelletizer to form green pellets, then putting the green pellets into a roasting furnace or a rotary kiln, preheating at the high temperature of 350-400 ℃ for 8 minutes, then continuously heating to 850-950 ℃ for continuously preheating for 10-15 minutes, and finally roasting at the temperature of 1200-1300 ℃ for 20 minutes to form the composite pellets. The red mud and the iron oxide red have certain viscosity, can play a part of bonding effect, but are not enough to provide enough strength, contain high crystal water and need high temperature removal, and most of moisture can be removed when the temperature is increased to be more than 300 ℃. Then, the green ball of the invention can be prepared by matching with the adhesive and the bentonite.
The iron-containing low-silicon binder product is prepared by taking rotary kiln pelletizing-blast furnace smelting as an example: the low-silicon binder product containing iron can completely replace bentonite, the weight ratio is 1 to 1.5 percent, the iron-containing grade of the pellet ore is improved by 0.24 to 0.30 percent, and SiO2The content is reduced by 0.8 to 1.0 percent, and the selling price of the pellets is improved by 8 to 15 yuan/ton; the coke-saving benefit of low-silicon extraction in blast furnace smelting can be increased by 20-25 yuan per ton of pellets.
Application example: the iron-containing low-silicon binder in the embodiment of the invention can be widely applied to the field of manufacturing various pellets such as oxidized pellets, direct reduction pellets, cold-pressed pellets, carbon-containing pellets and the like, has low addition amount, brings less gangue, can obviously improve the iron-containing grade, and has better smelting economy. Compared with the traditional bentonite, the content of SiO2 is only within 10 percent, the Al2O3 level is even, and the content of iron element is more than 30 percent. The ingredient comparison is as follows:
the product 1 of the invention is taken as an example, about 10kg of the product is applied to each ton of pellets, the product is half of the addition amount of the traditional bentonite, the addition amount of the product is equivalent to that of the modified composite bentonite, in the example of Xuan steel industrial production, 1.0 percent of low-silicon binder is applied to replace 2.1 percent of bentonite, the grade of finished pellets is improved by 0.71 percent, and SiO2The content is reduced by 0.87 percentage point, the ton ball benefit is improved by 3 yuan/t, and the smelting cost of the blast furnace is reduced by 3 per ton iron with the pellet proportion of 20 percent.
The iron-containing low-silicon binder prepared by the invention contains iron, can increase the grade of the pellets, can reduce the silicon content of the pellets, can treat red mud, iron oxide red and other solid waste products, can cooperatively treat solid waste resources, can reduce fuel consumption in the blast furnace smelting process, and accords with the characteristics of low carbon, energy saving and economy.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. The iron-containing low-silicon binder is characterized by comprising the following raw materials in parts by weight:
composition containing iron element: 30-90 parts of iron-containing composition, wherein the iron-containing composition consists of red mud and/or iron oxide red;
adhesive: 1-10 parts;
bentonite: 10-60 parts.
2. The iron-containing low-silicon binder as claimed in claim 1, wherein the raw materials comprise, by weight: 40 parts of red mud, 25 parts of iron oxide red, 5 parts of a binder and 30 parts of bentonite.
3. The iron-containing low-silicon binder as claimed in claim 1, wherein the raw materials comprise, by weight: 55 parts of red mud, 5 parts of a binder and 40 parts of bentonite.
4. The iron-containing low-silicon binder as claimed in claim 1, wherein the raw materials comprise, by weight: 45 parts of iron oxide red, 5 parts of a binder and 50 parts of bentonite.
5. The iron-containing low-silicon binder as claimed in any one of claims 1 to 4, wherein the binder is carboxymethyl cellulose.
6. According to the claimsThe iron-containing low-silicon binder is characterized in that after the raw materials are mixed in proportion, the weight percentage of iron is controlled to be 20-60%, and S isiO2The content is 2-15%.
7. The iron-containing low-silicon binder as claimed in claim 6, wherein the raw materials are mixed in proportion, the weight percentage of iron is controlled to be 30-50%, and S isiO2The content is 3-10%.
8. The iron-containing low-silicon binder as claimed in claim 1 or 2, wherein the red mud is selected to have an iron-containing grade of 30-50%, SiO2The content is between 6 and 10 percent; the iron-containing grade of the iron oxide red is 60-80%.
9. The method for preparing the iron-containing low-silicon binder according to any one of claims 1 to 8, comprising the following steps:
(1) heating the composition containing the iron element at a high temperature, increasing the temperature to be more than 300 ℃, and removing crystal water;
(2) mixing the composition containing ferric oxide, carboxymethyl cellulose and bentonite according to a certain proportion, grinding to obtain a powder with a fineness of 325 meshes and a sieving rate of more than 90%;
(3) and (4) strongly mixing the mixed materials uniformly again, and warehousing or packaging into bags.
10. Use of the iron-containing low-silicon binder according to claim 9 for oxidized pellets, direct reduced pellets, cold pressed pellets, carbon-containing pellets.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110689279.9A CN113416839A (en) | 2021-06-22 | 2021-06-22 | Iron-containing low-silicon binder and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110689279.9A CN113416839A (en) | 2021-06-22 | 2021-06-22 | Iron-containing low-silicon binder and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113416839A true CN113416839A (en) | 2021-09-21 |
Family
ID=77789785
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110689279.9A Pending CN113416839A (en) | 2021-06-22 | 2021-06-22 | Iron-containing low-silicon binder and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113416839A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114908250A (en) * | 2022-05-07 | 2022-08-16 | 山东莱钢永锋钢铁有限公司 | Binder for pellets, preparation method of binder and preparation method of pellets |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5395441A (en) * | 1992-10-19 | 1995-03-07 | Usx Corporation | Revert briquettes for iron making blast furnace |
| CN104988308A (en) * | 2015-06-26 | 2015-10-21 | 北京同创永诚冶金科技发展有限公司 | Iron ore pellet iron-rich composite bonder and preparation method and application thereof |
| CN106636521A (en) * | 2016-11-02 | 2017-05-10 | 江苏省冶金设计院有限公司 | Method and system for improving grinding separation effect of reduced pellets containing metal iron |
-
2021
- 2021-06-22 CN CN202110689279.9A patent/CN113416839A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5395441A (en) * | 1992-10-19 | 1995-03-07 | Usx Corporation | Revert briquettes for iron making blast furnace |
| CN104988308A (en) * | 2015-06-26 | 2015-10-21 | 北京同创永诚冶金科技发展有限公司 | Iron ore pellet iron-rich composite bonder and preparation method and application thereof |
| CN106636521A (en) * | 2016-11-02 | 2017-05-10 | 江苏省冶金设计院有限公司 | Method and system for improving grinding separation effect of reduced pellets containing metal iron |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114908250A (en) * | 2022-05-07 | 2022-08-16 | 山东莱钢永锋钢铁有限公司 | Binder for pellets, preparation method of binder and preparation method of pellets |
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Application publication date: 20210921 |