CN110923443A - Magnesium binder for improving strength of preheated pellets of magnesium-containing pellets and preparation method and application thereof - Google Patents
Magnesium binder for improving strength of preheated pellets of magnesium-containing pellets and preparation method and application thereof Download PDFInfo
- Publication number
- CN110923443A CN110923443A CN201911104392.5A CN201911104392A CN110923443A CN 110923443 A CN110923443 A CN 110923443A CN 201911104392 A CN201911104392 A CN 201911104392A CN 110923443 A CN110923443 A CN 110923443A
- Authority
- CN
- China
- Prior art keywords
- magnesium
- pellets
- binder
- percent
- pellet
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
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
- C22B1/2406—Binding; Briquetting ; Granulating pelletizing
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention relates to a binder for improving the strength of a preheated pellet containing magnesium, which is characterized in that the raw material of the binder consists of nano-soil and magnesium oxide powder, wherein the nano-soil accounts for 35-45%, and the magnesium oxide powder accounts for 55-65%; the preparation method comprises the following steps: weighing the raw materials according to the proportion, and uniformly mixing to obtain the binder with the particle size of-0.074 mm and the content of more than 80 percent; the application is as follows: mixing with iron ore concentrate powder in the proportion of 2-4%, pelletizing, roasting and cooling to obtain preheated pellet and magnesium-containing pellet. The advantages are that: under the condition of not changing thermal parameters of pellet production, the compressive strength of the preheated pellet is more than 500N, the compressive strength of the magnesium-containing pellet (MgO 1.75%) is more than 2500N, the compressive strength of the preheated pellet in the prior art is less than 300N, the compressive strength of the magnesium-containing pellet is less than 2300N, the roasting temperature is 1300 ℃, and the production operation difficulty is large; the invention is easy to be implemented and popularized in the production line of the grate-rotary kiln pellets.
Description
Technical Field
The invention belongs to the technical field of iron-making furnace burden preparation of a blast furnace in ferrous metallurgy, and particularly relates to a magnesium binder for improving the preheating pellet strength of magnesium-containing pellets, and a preparation method and application thereof.
Background
MgO can enhance the fluidity of blast furnace slag and improve the desulfurization capability, generally requires 8 to 12 percent, and has three approaches for the source: at present, the domestic blast furnace is almost completely from the sintered ore, so that the MgO of the sintered ore is basically over 2 percent, the drum strength of the sintered ore is low, and the fuel consumption is high; and the metallurgical properties of the high-alkalinity high-magnesium sinter ore and the acid pellet ore have large difference, so that the operation of a blast furnace and the overall iron-making benefit are influenced. Therefore, many scholars and ironmakers propose to transfer magnesium in the sinter to the pellets, and to adjust the blast furnace charge structure to high-basicity low-magnesium sinter + magnesium-containing pellets.
The production process of the magnesium-containing pellets is mainly based on a belt type roasting machine, has no requirement on preheating pellets, has higher proportion of hematite as a raw material and low requirement on an oxidation process, and can reach higher roasting temperature by mainly using natural gas with high calorific value as fuel, so that the magnesium-containing pellets are produced and applied in a large scale and obtain good blast furnace smelting indexes. But the production process of the pellets in China mainly comprises a grate-rotary kiln, and has higher requirements on the strength of the preheated pellets (the compressive strength is more than 450N/P, AC drum index is more than 95%); the magnetite is taken as a main raw material, and the magnesium ions are easy to replace ferrous ions in the magnetite to form a solid solution, so that the difficulty of oxidation of a preheating section of a chain grate is increased, the strength of a preheating ball of magnesium-containing pellets is in a descending trend along with the increase of the content of MgO, and the increase of powder entering a kiln is caused; in addition, the magnesium-containing pellets have higher roasting temperature requirement, and the fuel mainly comprises coal powder and coal gas with low calorific value, so that the difficulty in producing the magnesium-containing pellets by adopting a grate-rotary kiln process is high, the rotary kiln is easy to form rings, and related reports of long-term stable production are not found at present.
In order to strengthen the consolidation of the magnesium-containing pellets, some scholars add limestone, dolomite, quicklime and other calcium-containing substances, and the additives can be decomposed by heating to generate pores in the preheating stage, so that the additives are beneficial to oxidation but not beneficial to consolidation, and the strength of the preheated pellets of the magnesium-containing pellets is difficult to effectively improve; meanwhile, the addition of calcium can influence the alkalinity of the pellets and the charging proportion, so that higher requirements on the yield and the quality of the pellets are provided, and the realization in a short period is difficult.
Disclosure of Invention
Aiming at the problems of high production operation difficulty, easy ring formation of a rotary kiln and the like caused by low preheating pellet strength of magnesium-containing pellets, the invention aims to provide a magnesium binder for improving the preheating pellet strength of the magnesium-containing pellets, and a preparation method and application thereof, so that the preheating pellet strength of the magnesium-containing pellets is improved under the condition of not greatly adjusting pellet production configuration and process parameters, the production requirement of a chain grate machine-rotary kiln is met, and the operation difficulty of pellet production is reduced.
The purpose of the invention is realized by the following technical scheme: the magnesium binder for improving the strength of the preheated pellets of magnesium-containing pellets is characterized by comprising 45-55% of MgO and SiO as main components225% -30% of burn and loss<10％、CaO<3 percent of sodium bentonite and magnesia powder as main raw materials
Wherein the weight percentage of each component is as follows: 35 to 45 percent of sodium bentonite and 55 to 65 percent of magnesia powder.
Furthermore, the granularity of the sodium bentonite is-0.074 mm and accounts for more than 95%, and the granularity of the magnesia powder is-0.074 mm and accounts for more than 75%.
The invention relates to a preparation method of a magnesium binder for improving the strength of preheated pellets of magnesium-containing pellets, which is characterized in that the raw materials of the binder are as follows: sodium bentonite with the granularity of-0.074 mm accounting for more than 95 percent and the weight percent accounting for 35 percent to 45 percent, and magnesia powder with the granularity of-0.074 mm accounting for more than 75 percent and the weight percent accounting for 55 percent to 65 percent are weighed according to the proportion and fully and uniformly mixed to prepare the magnesia binder with the granularity of-0.074 mm and the content of more than 80 percent.
The application of the magnesium binder for improving the preheating pellet strength of the magnesium-containing pellets is characterized in that when the magnesium-containing pellets are prepared, the magnesium binder with the weight percentage of 2-4% is added into iron concentrate powder, and the preheating pellet compressive strength of more than 500N/P is prepared by uniformly mixing, pelletizing, roasting and cooling, so that the production requirement of a chain grate machine rotary kiln is met.
Compared with the prior art, the invention has the advantages that:
in the prior art, the compressive strength of preheated pellets containing magnesium (MgO is 1.5-2.0%) is less than 300N/P, the compressive strength of roasted pellets is less than 2300N/P, the roasting temperature is 1300 ℃, and the production operation difficulty is high; the roasting temperature of the pellets containing magnesium (MgO1.75-2.0%) prepared by the invention is 1275 ℃, the roasting temperature is consistent with the production process parameters of common acid pellets, and the compressive strength of the obtained preheated pellets is more than 500N/P and the compressive strength of the roasted pellets is more than 2500N/P.
Detailed Description
The present invention will be further described with reference to the following examples.
1. Physical and chemical properties of iron ore concentrate
The pelletized iron concentrates adopted in the comparative examples and examples are hematite and magnetite, and the physicochemical properties of the hematite and the magnetite are shown in table 1:
TABLE 1 iron concentrates mineralisation Performance
Wherein, the iron ore concentrate raw material is as hematite: magnetite 30:70 ratio.
2. Raw materials of binder and physical and chemical properties thereof
The binder adopted in the comparative example is composite bentonite, the magnesium binder adopted in the example is sodium bentonite and magnesium oxide powder, and the physicochemical properties of the binder are shown in Table 2.
TABLE 2 Binder and physical and chemical properties of its raw materials
The sodium bentonite is divided according to the species and the content of exchangeable cations between montmorillonite layers: sodium bentonite with alkalinity coefficient more than or equal to 1, and calcium bentonite with alkalinity coefficient less than 1.
In table 2, the ratio of sodium bentonite to magnesium oxide powder for magnesium binder # 1 and magnesium binder # 2 was 41:59, and the ratio of sodium bentonite to magnesium oxide powder for magnesium binder # 3 and magnesium binder # 4 was 37: 63.
3. Pelletizing process parameters and drying system
The pelletizing technological parameters for pellet ore production are as follows: 9.0 to 9.5 percent of water, 10min of time and 23r/min of disc rotating speed; the drying system is as follows: blowing at 250 deg.C for 2min, and air-extracting at 400 deg.C for 4.7 min; preheating at 975 ℃ for 10min, and roasting at 1275 ℃ for 10min to obtain magnesium-containing pellets (MgO 1.75% -2.0%).
4. Comparative example and example pellet performance index comparison
The pellet strength indexes of the comparative example and the example are shown in table 3.
TABLE 3 pellet index comparison of comparative and example
In table 3, comparative example 1 is an index corresponding to a general acid pellet; comparative example 2 is an index corresponding to a magnesium-containing pellet prepared by adding magnesium powder; examples 1, 2, 3 and 4 are indexes corresponding to magnesium-containing pellets prepared from the magnesium binder of the present invention.
As can be seen from Table 3, compared with the prior art of comparative example 2 containing magnesium pellets, the strength of the preheated pellets can be greatly improved on the basis of not reducing the quality of green pellets by replacing the composite bentonite with the sodium bentonite; compared with the comparative example 1 of the common acid pellet ore added with the composite bentonite alone, the strength of the preheating pellet ore of the invention is also improved to a certain extent. Compared with the prior art, the strength of the roasted pellets is obviously improved in comparison example 2 containing the magnesium pellets; the strength of the roasted pellet is close to that of the comparative example 1 of the common acid pellet, and each index is better.
Claims (4)
1. The magnesium binder for improving the strength of the preheated pellets of magnesium-containing pellets is characterized by comprising 45-55% of MgO and SiO as main components225% -30% of burn and loss<10％、CaO<3 percent of sodium bentonite and magnesia powder as main raw materials, wherein the weight percentage of each component is as follows:35 to 45 percent of sodium bentonite and 55 to 65 percent of magnesia powder.
2. The binder for improving the strength of the preheated pellets of magnesium-containing pellets as claimed in claim 1, wherein the particle size of the sodium bentonite is-0.074 mm accounting for 95% or more, and the particle size of the magnesium oxide powder is-0.074 mm accounting for 75%.
3. The preparation method of the magnesium binder for improving the strength of the preheated pellets of magnesium-containing pellets is characterized by comprising the following steps: sodium bentonite with the granularity of-0.074 mm accounting for more than 95 percent \ weight percent is 35-45 percent, and magnesium oxide powder with the granularity of-0.074 mm accounting for more than 75 percent \ weight percent is 55-65 percent is weighed according to the proportion and then fully and uniformly mixed, thus obtaining the magnesium binder with the granularity of-0.074 mm and the content of more than 80 percent.
4. The application of the magnesium binder for improving the preheating pellet strength of the magnesium-containing pellets is characterized in that when the magnesium-containing pellets are prepared, the magnesium binder with the weight percentage of 2-4% is added into iron concentrate powder, and the magnesium-containing pellets with the preheating pellet compressive strength of more than 500N/P are prepared through uniform mixing, pelletizing, roasting and cooling, so that the process requirement of a chain grate machine-rotary kiln is met.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911104392.5A CN110923443A (en) | 2019-11-13 | 2019-11-13 | Magnesium binder for improving strength of preheated pellets of magnesium-containing pellets and preparation method and application thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911104392.5A CN110923443A (en) | 2019-11-13 | 2019-11-13 | Magnesium binder for improving strength of preheated pellets of magnesium-containing pellets and preparation method and application thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110923443A true CN110923443A (en) | 2020-03-27 |
Family
ID=69852714
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911104392.5A Pending CN110923443A (en) | 2019-11-13 | 2019-11-13 | Magnesium binder for improving strength of preheated pellets of magnesium-containing pellets and preparation method and application thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110923443A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112410540A (en) * | 2020-11-27 | 2021-02-26 | 山西太钢不锈钢股份有限公司 | Preparation method of magnesium pellet and magnesium pellet |
| CN113151672A (en) * | 2021-04-23 | 2021-07-23 | 铜陵博锋实业有限公司 | Method for improving compression strength of alkaline pellets prepared with limestone |
| CN113637843A (en) * | 2021-03-18 | 2021-11-12 | 许贵宾 | Method for producing composite flux pellet ore by grate rotary kiln |
| CN113832339A (en) * | 2021-09-29 | 2021-12-24 | 包头钢铁（集团）有限责任公司 | Flux for sintering |
| CN114763582A (en) * | 2021-01-15 | 2022-07-19 | 宝山钢铁股份有限公司 | Method for producing magnesium pellets by using oriented silicon steel magnesium oxide waste |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1851013A (en) * | 2006-05-26 | 2006-10-25 | 李建文 | Magnesium composite additive |
| CN101215632A (en) * | 2007-12-27 | 2008-07-09 | 钢铁研究总院 | Bonding agent for iron ore pellet and preparation method thereof |
| CN102230079A (en) * | 2010-07-09 | 2011-11-02 | 鞍钢集团矿业公司 | Process for producing magnesia pellets by using chain grate machine rotary kiln |
| CN102719662A (en) * | 2011-03-30 | 2012-10-10 | 鞍钢股份有限公司 | Magnesium binder used for pellet and preparation method and addition method thereof |
| CN107723465A (en) * | 2017-09-28 | 2018-02-23 | 毕德玉 | A kind of compound method of pelletizing binding agent containing magnesium |
| CN108866325A (en) * | 2017-07-14 | 2018-11-23 | 淮北益嘉益新材料科技有限公司 | A method of improving magnesian flux bursting temperature of pellet ores |
-
2019
- 2019-11-13 CN CN201911104392.5A patent/CN110923443A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1851013A (en) * | 2006-05-26 | 2006-10-25 | 李建文 | Magnesium composite additive |
| CN101215632A (en) * | 2007-12-27 | 2008-07-09 | 钢铁研究总院 | Bonding agent for iron ore pellet and preparation method thereof |
| CN102230079A (en) * | 2010-07-09 | 2011-11-02 | 鞍钢集团矿业公司 | Process for producing magnesia pellets by using chain grate machine rotary kiln |
| CN102719662A (en) * | 2011-03-30 | 2012-10-10 | 鞍钢股份有限公司 | Magnesium binder used for pellet and preparation method and addition method thereof |
| CN108866325A (en) * | 2017-07-14 | 2018-11-23 | 淮北益嘉益新材料科技有限公司 | A method of improving magnesian flux bursting temperature of pellet ores |
| CN107723465A (en) * | 2017-09-28 | 2018-02-23 | 毕德玉 | A kind of compound method of pelletizing binding agent containing magnesium |
Non-Patent Citations (2)
| Title |
|---|
| 任伟等: "富镁膨润土用于铁矿球团的试验研究", 《2014年全国炼铁生产技术会暨炼铁学术年会文集(上)》 * |
| 孙彬等: "鞍钢利用镁基粘结剂生产镁质球团的工业试验", 《第十二届中国钢铁年会论文集——1.炼铁与原料》 * |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112410540A (en) * | 2020-11-27 | 2021-02-26 | 山西太钢不锈钢股份有限公司 | Preparation method of magnesium pellet and magnesium pellet |
| CN112410540B (en) * | 2020-11-27 | 2023-01-31 | 山西太钢不锈钢股份有限公司 | Preparation method of magnesium pellet and magnesium pellet |
| CN114763582A (en) * | 2021-01-15 | 2022-07-19 | 宝山钢铁股份有限公司 | Method for producing magnesium pellets by using oriented silicon steel magnesium oxide waste |
| CN114763582B (en) * | 2021-01-15 | 2023-09-12 | 宝山钢铁股份有限公司 | Method for producing magnesium pellets by using oriented silicon steel magnesia waste |
| CN113637843A (en) * | 2021-03-18 | 2021-11-12 | 许贵宾 | Method for producing composite flux pellet ore by grate rotary kiln |
| CN113151672A (en) * | 2021-04-23 | 2021-07-23 | 铜陵博锋实业有限公司 | Method for improving compression strength of alkaline pellets prepared with limestone |
| CN113832339A (en) * | 2021-09-29 | 2021-12-24 | 包头钢铁（集团）有限责任公司 | Flux for sintering |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110923443A (en) | Magnesium binder for improving strength of preheated pellets of magnesium-containing pellets and preparation method and application thereof | |
| CN110904334A (en) | Preparation method of iron ore pellets | |
| CN104726696B (en) | Middle basicity deep-bed sintering production method | |
| CN102220440B (en) | Vanadium-titanium magnetite blast furnace smelting method capable of improving vanadium yield | |
| CN109652643B (en) | High-quality sinter for COREX smelting reduction iron-making process and preparation method thereof | |
| CN104073627A (en) | Producing method of fluxed composite pellet | |
| CN108950189B (en) | method for producing MgO-containing sintered ore by using waste magnesia carbon bricks | |
| CN111910072A (en) | Preparation and use methods of pre-reduced fluxed pellets with steel slag as partial raw material | |
| CN108070713B (en) | Iron ore sintering method using light-burned magnesium balls | |
| CN105695850A (en) | Utilization method of nickel-contained iron ore | |
| CN110894575A (en) | Composite binder for low-alkalinity magnesium pellets and preparation method and application thereof | |
| CN104357657A (en) | Method for preparing oxidized pellets from converter dedusting ash | |
| CN104630475A (en) | Method for producing ferrochrome | |
| CN108998606B (en) | The blast furnace ferrous burden structure that a kind of pellet and Metallurgical Properties of Sinter are distributed rationally | |
| CN108950191B (en) | It is used to prepare the carbon-bearing lump and mixing preparation method for material of full concentrate sinter mixture | |
| CN105755195A (en) | Method for directly preparing molten steel from high-silicon iron ores | |
| CN117467840A (en) | Production method for producing full-hematite-limonite oxidized pellets based on partition oxygen control | |
| CN112391523A (en) | High SiO2Roasting control method for process of flux pellet rotary kiln | |
| CN110982971B (en) | MgO optimal distribution method for blast furnace iron-containing furnace burden | |
| CN110643760A (en) | Ultrahigh Al2O3Blast furnace smelting method of furnace slag | |
| CN106148679A (en) | A kind of Application way of the lean josephinite of high aluminium profiles | |
| CN110343796B (en) | Method for reducing iron loss in blast furnace smelting of vanadium titano-magnetite | |
| CN104419824A (en) | Material distribution method for producing pre-reduced agglomerate | |
| CN103805729A (en) | Method for producing low-sulfur pig iron for steel manufacture by using rotary hearth furnace | |
| CN108642225B (en) | Method for preparing ferronickel and aluminate cement admixture by using converter slag |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200327 |