CN116043012B - Sintering-free cold-bonded pellet for blast furnace and binder - Google Patents
Sintering-free cold-bonded pellet for blast furnace and binder Download PDFInfo
- Publication number
- CN116043012B CN116043012B CN202310339816.6A CN202310339816A CN116043012B CN 116043012 B CN116043012 B CN 116043012B CN 202310339816 A CN202310339816 A CN 202310339816A CN 116043012 B CN116043012 B CN 116043012B
- Authority
- CN
- China
- Prior art keywords
- parts
- binder
- blast furnace
- sintering
- free cold
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
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
- C22B1/243—Binding; Briquetting ; Granulating with binders inorganic
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention relates to the technical field of steel smelting, and provides a blast furnace sintering-free cold-bonded pellet and a binder, wherein the binder comprises the following components in parts by weight: 1-1.5 parts of tapioca gelatinized starch, 1-2 parts of magnesium chloride, 1-2 parts of phenolic resin and 0.02-0.9 part of stabilizer; the stabilizer comprises one or more of graphite, hexagonal boron nitride and zirconia. Through the technical scheme, the problem that the binder in the prior art cannot meet the high requirements of the blast furnace ironmaking pellets on strength and pulverization expansion coefficient is solved.
Description
Technical Field
The invention relates to the technical field of steel smelting, in particular to a blast furnace sintering-free cold-bonded pellet and a binder.
Background
Blast furnace smelting has been the main burden for sintered ore and oxidized pellets in the metallurgical industry. The sinter and the oxidized pellet are produced by high-temperature roasting, and a large amount of pollutants are generated in the roasting process, wherein 4000Nm of flue gas containing CO is discharged per ton of sinter 2 200kg、SO 2 160g、NO X 200g and 35g of solid particles.
The metallurgical industry at home and abroad starts to make great breakthroughs in the smelting furnace type, the blast furnace smelting is continuously improved and optimized, and the research strength is continuously increased in the furnace burden production process, so that the blast furnace smelting is greatly improved, but the problem of the prior iron process product is not fundamentally solved.
Along with the continuous increase of the national environmental protection policy, the development of sintering-free artificial lump ores, and the substitution of the original artificial lump ore roasting process by using a new technology binder, become the main development direction of the current steel industry. In the process of agglomeration, the artificial lump ore can not only change the granularity composition and mechanical strength of the mineral aggregate, but also remove a part of elements harmful to smelting, improve the quality of the mineral aggregate and improve the mineral phase structure and metallurgical performance. Therefore, the artificial lump ore is used to meet the steel smelting standard, and is beneficial to strengthening the steel smelting production.
The core of the sintering-free artificial lump ore, namely the sintering-free cold bonded pellet, is the binder technology, which has the following characteristics:
1. the adhesive is required to have high adhesive index at normal temperature, so that the normal-temperature cold strength of the oxidized pellet ore is ensured to be more than or equal to 2200N;
2. the addition proportion of the binder is low, and the influence on iron elements in the iron ore powder is small;
3. the binder does not contain harmful elements which have influence on blast furnace smelting;
4. the binder ensures that the pellets have corresponding strength in the low temperature 500 ℃, the medium temperature region 600-900 ℃ and the high temperature region 900-1200 ℃ and cannot expand, burst and crush.
However, the existing binder cannot meet the above requirements, so that development of a binder specific to the sintering-free cooled agglomerated pellet capable of meeting the use requirements is needed.
Disclosure of Invention
The invention provides a blast furnace sintering-free cold-bonded pellet and a binder, which solve the problem that the binder in the related art cannot meet the high requirements of the blast furnace ironmaking pellet on strength and pulverization expansion coefficient.
The technical scheme of the invention is as follows:
the binder for the sintering-free cold-bonded pellets of the blast furnace comprises the following components in parts by weight: 1-1.5 parts of tapioca gelatinized starch, 1-2 parts of magnesium chloride, 1-2 parts of phenolic resin and 0.02-0.9 part of stabilizer;
the stabilizer comprises one or more of graphite, hexagonal boron nitride and zirconia.
As a further technical scheme, the preparation method of the tapioca gelatinized starch comprises the following steps:
adding 11-12 parts of water, 2-3 parts of sodium hydroxide, 0.5-1 part of polyvinyl alcohol and 0-0.5 part of hydroxypropyl cellulose into 100 parts of tapioca starch, and uniformly stirring to gelatinize at 90-220 ℃.
As a further technical scheme, the gelatinization temperature is 185-190 ℃.
As a further technical scheme, the stabilizer comprises graphite, hexagonal boron nitride and zirconia, and the proportion of the graphite, the hexagonal boron nitride and the zirconia is (0-80): (3-5): (1-3).
As a further technical scheme, the stabilizer comprises graphite, hexagonal boron nitride and zirconia, and the proportion of the graphite, the hexagonal boron nitride and the zirconia is (50-80): (3-5): (1-3).
As a further technical scheme, the viscosity of the phenolic resin is 8000-10000 mpa.s.
As a further technical scheme, the phenolic resin is water-soluble phenolic resin.
The invention also provides a blast furnace sintering-free cold-bonded pellet, which comprises the binder.
As a further technical scheme, the blast furnace sintering-free cold bonded pellet further comprises iron fine powder, wherein the mass ratio of the binder to the iron fine powder is (4-8): 100.
the invention also provides application of the blast furnace sintering-free cold-bonded pellets in blast furnace ironmaking.
The beneficial effects of the invention are as follows:
1. the binder can be applied to all high-grade (more than or equal to 65%) iron ore powder in the market, does not need to be subjected to high-temperature roasting, is directly bonded, and after being solidified, the cold-hot strength, the pulverization expansion coefficient and the like all meet the smelting index of the blast furnace in the smelting link of the blast furnace, even exceed the oxidized pellet ore, and the whole production link does not need high-temperature roasting, does not produce the emission of atmospheric pollutants, and does not produce secondary dust in the whole production process.
2. The adhesive of the invention takes tapioca gelatinized starch, magnesium chloride, phenolic resin and stabilizer as main components. Wherein:
(1) The tapioca gelatinized starch is added into the material, can be rapidly dissolved and wrapped on the surfaces of the material particles to form a layer of film with a bonding effect, and simultaneously fills gaps among the particles to promote initial forming of pellets, so that compared with the pellets bonded by the conventional corn gelatinized starch, the tapioca gelatinized starch has better viscoelasticity and improves the dropping strength of wet pellets; after drying, solid-phase bonding bridge bonding material particles can be formed, so that the pellets have excellent compressive strength.
(2) Magnesium chloride is an inorganic binder, can be quickly dissolved, changes the porosity, surface electrical property and specific surface area of materials, blocks capillary holes in pellets, plays a skeleton role after the pellets are formed, and can effectively improve the compressive strength and the reduction softening temperature of finished pellets.
(3) The low-viscosity water-soluble phenolic resin can form a net structure with materials, so that the pellets have excellent heat resistance, the low-temperature pulverization rate of the pellets is improved, the strength is high after curing, and the adhesive layer is brittle.
(4) The stabilizer provided by the invention has certain high-temperature chemical stability and lubricity, can improve the brittleness of a phenolic resin adhesive layer, and can stabilize the surface adhesive force of the binder on material particles in the low-temperature reduction process, so that the cracking and pulverization are reduced.
3. The formula of the binder fully considers the compatibility and the synergistic effect of the components, wherein the tapioca gelatinized starch has a decisive effect on initial forming, and is mutually crosslinked with the water-soluble phenolic resin and the material particles to form a net structure together, so that the compressive strength of the finished pellets is further improved, and the guarantee is provided for the pellets to be smoothly fed into a furnace; magnesium chloride plays an important role in the compression strength of the finished pellets and the low-temperature reduction stage after the pellets are fed into a furnace; the stabilizer improves the brittleness of the phenolic resin adhesive layer to a certain extent, and the pellets are kept from bursting and powdering in the furnace.
Detailed Description
The technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The preparation method of the gelatinized tapioca starch in the examples comprises the following steps: adding 12 parts of water, 3 parts of sodium hydroxide, 1 part of polyvinyl alcohol and 0.5 part of hydroxypropyl cellulose into 100 parts of tapioca starch, and uniformly stirring to gelatinize at 185-190 ℃.
Example 1
1.2 parts of tapioca gelatinized starch, 2 parts of magnesium chloride, 1.5 parts of phenolic resin and 0.6 part of graphite are added into every 100 parts of iron fine powder, and the mixture is pressed into balls by a ball press.
Example 2
1.2 parts of tapioca gelatinized starch, 2 parts of magnesium chloride, 1.5 parts of phenolic resin and 0.02 part of hexagonal boron nitride are added into every 100 parts of iron fine powder, and the mixture is pressed into balls by a ball press.
Example 3
1.2 parts of tapioca gelatinized starch, 2 parts of magnesium chloride, 1.5 parts of phenolic resin and 0.02 part of zirconia are added into every 100 parts of iron fine powder, and the mixture is pressed into balls by a ball press.
Example 4
1.2 parts of tapioca gelatinized starch, 2 parts of magnesium chloride, 1.5 parts of phenolic resin, 0.5 part of graphite and 0.02 part of hexagonal boron nitride are added into every 100 parts of iron fine powder, and the mixture is pressed into balls by a ball press.
Example 5
1.2 parts of tapioca gelatinized starch, 2 parts of magnesium chloride, 1.5 parts of phenolic resin, 0.5 part of graphite, 0.02 part of hexagonal boron nitride and 0.02 part of zirconia are added into every 100 parts of iron fine powder, and the mixture is pressed into balls by a ball press.
Example 6
1.5 parts of tapioca gelatinized starch, 2.5 parts of magnesium chloride, 2 parts of phenolic resin, 0.7 part of graphite, 0.03 part of hexagonal boron nitride and 0.03 part of zirconia are added into every 100 parts of iron fine powder, and the mixture is pressed into balls by a ball press.
Example 7
1 part of tapioca gelatinized starch, 1 part of magnesium chloride, 1 part of phenolic resin, 0.8 part of graphite, 0.05 part of hexagonal boron nitride and 0.03 part of zirconia are added into every 100 parts of iron fine powder, and the mixture is pressed into balls by a ball press.
Comparative example 1
Compared with example 6, tapioca starch was replaced with corn starch, and the other was the same as in example 6.
The multi-batch sintering-free cold bonded pellets obtained in the examples and the comparative examples were tested according to the following criteria:
the mechanical compressive strength is tested according to GB/T14201-2018 'determination of compressive strength of iron pellets for blast furnace and direct reduction';
the reduction degree index is tested according to GB/T13241-2017 method for measuring the reducibility of iron ores;
the drum index (RDI) was tested according to GB/T13242-2017 method for static reduction of iron ore after low temperature pulverization test using a cold drum +6.3 ) Low temperature Reduction Degradation Index (RDI) +3.15 )。
Table 1 results of performance test of the cooled agglomerated pellets of examples and comparative examples
In comparative example 1, corn starch is used to replace tapioca starch, and the mechanical strength and the tumbler index of the obtained pellets are reduced after gelatinization treatment, and the low-temperature reduction degradation index and the reduction degree index have little influence.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (8)
1. The binder for the sintering-free cold-bonded pellets of the blast furnace is characterized by comprising the following components in parts by weight: 1-1.5 parts of tapioca gelatinized starch, 1-2 parts of magnesium chloride, 1-2 parts of phenolic resin and 0.02-0.9 part of stabilizer;
the stabilizer comprises one or more of graphite, hexagonal boron nitride and zirconia.
2. The binder for the sintering-free cold-bonded pellets of the blast furnace according to claim 1, wherein the preparation method of the tapioca gelatinized starch comprises the following steps:
adding 11-12 parts of water, 2-3 parts of sodium hydroxide, 0.5-1 part of polyvinyl alcohol and 0-0.5 part of hydroxypropyl cellulose into 100 parts of tapioca starch, and uniformly stirring to gelatinize at 185-190 ℃.
3. The binder for the sintering-free cold-bonded pellets of the blast furnace according to claim 1, wherein the stabilizer comprises graphite, hexagonal boron nitride and zirconia, and the proportion of the graphite, the hexagonal boron nitride and the zirconia is (0-80): (3-5): (1-3).
4. The binder for the sintering-free cold-bonded pellets of the blast furnace according to claim 1, wherein the stabilizer comprises graphite, hexagonal boron nitride and zirconia, and the proportion of the graphite, the hexagonal boron nitride and the zirconia is (50-80): (3-5): (1-3).
5. The binder for sintering-free cold-bonded pellets for blast furnace according to claim 1, wherein the viscosity of the phenolic resin is 8000-10000 mpa.s.
6. The binder for sintering-free cold-bonded pellets for blast furnace of claim 1, wherein the phenolic resin is a water-soluble phenolic resin.
7. A blast furnace sintering-free cold bonded pellet, comprising the binder of any one of claims 1-6.
8. The blast furnace sintering-free cold bonded pellet according to claim 7, further comprising iron fines, wherein the mass ratio of the binder to the iron fines is (4-8): 100.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310339816.6A CN116043012B (en) | 2023-04-03 | 2023-04-03 | Sintering-free cold-bonded pellet for blast furnace and binder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310339816.6A CN116043012B (en) | 2023-04-03 | 2023-04-03 | Sintering-free cold-bonded pellet for blast furnace and binder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN116043012A CN116043012A (en) | 2023-05-02 |
| CN116043012B true CN116043012B (en) | 2023-06-02 |
Family
ID=86133610
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310339816.6A Active CN116043012B (en) | 2023-04-03 | 2023-04-03 | Sintering-free cold-bonded pellet for blast furnace and binder |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116043012B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007270260A (en) * | 2006-03-31 | 2007-10-18 | Jfe Steel Kk | Unbaked agglomerated ore for iron manufacture |
| CN103710536A (en) * | 2013-12-30 | 2014-04-09 | 吴雪健 | Preparation method of pellet binder with high performance |
| CN107034361A (en) * | 2017-04-21 | 2017-08-11 | 山西太钢不锈钢股份有限公司 | A kind of Application way of dedusting ash of stainless steel |
| CN109536704A (en) * | 2018-12-03 | 2019-03-29 | 攀枝花钢城集团有限公司 | Steel-making enrichment sludge complex adhesive and its preparation and application |
-
2023
- 2023-04-03 CN CN202310339816.6A patent/CN116043012B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007270260A (en) * | 2006-03-31 | 2007-10-18 | Jfe Steel Kk | Unbaked agglomerated ore for iron manufacture |
| CN103710536A (en) * | 2013-12-30 | 2014-04-09 | 吴雪健 | Preparation method of pellet binder with high performance |
| CN107034361A (en) * | 2017-04-21 | 2017-08-11 | 山西太钢不锈钢股份有限公司 | A kind of Application way of dedusting ash of stainless steel |
| CN109536704A (en) * | 2018-12-03 | 2019-03-29 | 攀枝花钢城集团有限公司 | Steel-making enrichment sludge complex adhesive and its preparation and application |
Also Published As
| Publication number | Publication date |
|---|---|
| CN116043012A (en) | 2023-05-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100562589C (en) | A kind of iron ore pellets sodium bentonite based binder and preparation method thereof | |
| CN103937969B (en) | A kind of powdered iron ore pellet binder and application thereof | |
| CN101619387B (en) | Low-temperature concretion adhesive for cold press iron coke and preparation method thereof | |
| CN106010707A (en) | Forming method of semicoke powder and quicklime powder | |
| CN116043012B (en) | Sintering-free cold-bonded pellet for blast furnace and binder | |
| JP2016108580A (en) | Manufacturing method of carbon material interior ore | |
| CN101619386B (en) | Iron coke for blast furnaces, preparation method and application thereof | |
| CN108796216B (en) | Pellet iron-magnesium composite binder and preparation and use methods thereof | |
| CN108588411B (en) | Preparation method of high-carbon-content metallized briquette for blast furnace | |
| CN100529003C (en) | Binder adapted for production of cooled agglomerated pellet by using iron-bearing material | |
| KR20220013351A (en) | Iron ore fine agglomerate manufacturing process and agglomeration product | |
| CN115874047A (en) | Fluxed pellet containing specularite and preparation method thereof | |
| JPS63196689A (en) | Method of molding powdery coke | |
| CN102628099B (en) | Method for forming balls by cooling and solidifying mineral powder by using water glass as bonding agent | |
| JP6326074B2 (en) | Carbon material interior ore and method for producing the same | |
| JP3416547B2 (en) | High carbon content briquette and method for producing the same | |
| CN107365908A (en) | A kind of magnesia compound binding agent of pellet and preparation method thereof and application method | |
| CN117403061B (en) | Binder for quick solidification of cold solidified pellet | |
| CN101956067A (en) | Binder for cold-pressed metallurgical pellets and preparation method and using method thereof | |
| JP6996268B2 (en) | Charcoal interior ore and its manufacturing method | |
| CN109439896A (en) | The preparation method of self-fluxing nature composite pellet | |
| JP5825180B2 (en) | Method for producing unfired carbon-containing agglomerated ore for blast furnace using coal char | |
| JP6939667B2 (en) | Charcoal lumber interior ore and its manufacturing method | |
| WO2021029008A1 (en) | Carbon composite ore and method for manufacturing same | |
| CN115011794A (en) | Binder for forming silica fume, and preparation method and application thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |