CN110819794A - Method for improving low-temperature reduction powdering property of sinter - Google Patents

Method for improving low-temperature reduction powdering property of sinter Download PDF

Info

Publication number
CN110819794A
CN110819794A CN201911028007.3A CN201911028007A CN110819794A CN 110819794 A CN110819794 A CN 110819794A CN 201911028007 A CN201911028007 A CN 201911028007A CN 110819794 A CN110819794 A CN 110819794A
Authority
CN
China
Prior art keywords
sintering
fuel
mixture
mass
temperature reduction
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
Application number
CN201911028007.3A
Other languages
Chinese (zh)
Inventor
张辉
夏铁玉
顾颜
周明顺
颜庆双
刘帅
宫作岩
翟立委
刘杰
徐礼兵
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Angang Steel Co Ltd
Original Assignee
Angang Steel Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Angang Steel Co Ltd filed Critical Angang Steel Co Ltd
Priority to CN201911028007.3A priority Critical patent/CN110819794A/en
Publication of CN110819794A publication Critical patent/CN110819794A/en
Pending legal-status Critical Current

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
    • C22B1/16—Sintering; Agglomerating
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B5/00—Making pig-iron in the blast furnace
    • C21B5/008—Composition or distribution of the charge

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Organic Chemistry (AREA)
  • Metallurgy (AREA)
  • Materials Engineering (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Manufacture And Refinement Of Metals (AREA)

Abstract

The invention discloses a method for improving low-temperature reduction pulverization of a sinter, which optimizes fuel composition and proportion in each layer of mixture through layered distribution, balances heat distribution of each layer and mineral composition of the sinter, can improve low-temperature reduction pulverization performance of the sinter and increase the consumption of low-price fuel; by spraying a special pulverization inhibitor during granulation of each layer of mixture, the low-temperature reduction pulverization rate of the sinter can be greatly improved under the condition of not spraying halide.

Description

Method for improving low-temperature reduction powdering property of sinter
Technical Field
The invention belongs to the technical field of iron-making production, and particularly relates to a method for improving low-temperature reduction powdering property of sinter.
Background
The low-temperature reduction degradation index of the sintered ore is one of important indexes for measuring the quality of metallurgical performance of the sintered ore, has obvious influence on the air permeability of a charge column in a blast furnace, and is related to the smooth operation of blast furnace production. The reason for low-temperature reduction degradation of the sinter is that the sinter contains a large amount of secondary hematite, particularly skeleton-shaped rhombohedral hematite, and the trigonal hematite is converted into isometric magnetite in the reduction process, so that the lattice volume expands. Because the components of the sintered ore are complex, the expansion performance of each phase is greatly different, so that great crushing stress is generated in the sintered ore, and the sintered ore is cracked. As the reduction progresses, more hematite is reduced, the cracks propagate into the surrounding sinter matrix, and more hematite exposed at the crack walls is reduced, causing the cracks to progress further.
The final degree of pulverization of the sintered ore is determined by the content, strength and size and distribution of the binder phase in the sintered ore, and the pulverization degree is continuously increased when cracks are not developed to sufficiently buffer and absorb the binder phase in the sintered ore. On the contrary, the development of cracks is restricted and powdering is suppressed. Reducing the content of hematite in the sinter, in particular the content of the skeleton-shaped rhombohedral hematite; the improvement of the liquid phase yield, especially the high-quality liquid phase yield, in the sintering process is a fundamental measure for inhibiting the low-temperature reduction degradation of the sinter; meanwhile, the components of the sinter have obvious influence on the low-temperature reduction degradation of the sinter.
Research on regulating the components of the sinter by an ore blending method shows that RDI is adopted when the FeO content in the sinter is increased by 1 percent+3.15The improvement is 3.5 percent; SiO 22RDI for every 1% increase in content+3.15The improvement is 1.46%; RDI for every 1% increase in CaO content+3.15, the improvement is 4%; al (Al)2O3RDI for every 0.1% increase in the content+3.15The reduction is 1.1%; TiO 22Increased content, RDI+3.15Enhanced, but TiO2>At 15%, RDI+3.15And decreases. Therefore, suppression of low-temperature reduction degradation of the sintered ore by the regulation of the composition of the sintered ore is considered to be an effective measure. However, the measures for adjusting the composition of the sintered ore by ore blending are limited by resource supply, ore blending cost, and the like, and it is difficult to adjust the composition of the sintered ore by ore blendingTo achieve this.
From the analysis of a specific production process, during sintering production, because the temperature of an upper material layer is low, the high-temperature zone is narrow, the quantity of a binder phase is insufficient, the cooling speed is high, and the content of glass correspondingly increases, the strength of a sintered ore is poor, the powder is more, and the pulverization index is poor. At the lower part of the material layer, due to the function of automatic heat storage, the material layer temperature is high, the high-temperature bandwidth is wide, the sintering ore is excessively melted, so that the ferrous oxide is increased, the porosity is reduced, the micro-pores are reduced, and the calcium metasilicate can be produced in large quantity, the crystal form is changed during the cooling process, the volume is expanded, and the low-temperature reduction degradation index of the sintering ore is reduced. At present, in the method for reducing the low-temperature reduction degradation rate of sinter, a halide solution is generally sprayed by steel enterprises, but the halide solution can corrode a pipeline after being sprayed, and the halide is enriched in a blast furnace, so that the long service life of the blast furnace and the safety belt are greatly damaged.
In the prior art, the effect of reducing the low-temperature reduction degradation of the sinter in the blast furnace is not ideal enough, so that a method for effectively reducing the low-temperature reduction degradation rate of the iron sinter and improving the charging quality of the sinter is urgently needed.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a method for improving the low-temperature reduction powdering property of a sinter, which balances the heat distribution of each layer and the mineral composition of the sinter by optimizing the fuel composition and the proportion in each layer of mixed material; on the other hand, a specially-made pulverization inhibitor is sprayed when each layer of mixture is granulated, so that the low-temperature reduction pulverization rate of the sinter can be greatly improved under the condition of not spraying halide.
In order to realize the purpose of the invention, the technical scheme adopted by the invention is as follows:
a method for improving low-temperature reduction pulverization of sinter is characterized by comprising the following steps: the method comprises the following steps of distributing materials in three layers, wherein the types and the proportions of fuels in each layer of sintering materials are different, and a pulverization inhibitor is added into each layer in a certain proportion, and the method comprises the following specific steps:
(1) mixing materials:
a) the sintering raw material and the fuel A are subjected to primary mixing and secondary mixing granulation to form a sintering mixture A, wherein the addition mass percentage of the fuel A is 3-4%; adding 2.5-4% of pulverization inhibitor in percentage by mass during the second mixing granulation; the fuel A is formed by mixing anthracite and biomass carbon powder, wherein the anthracite accounts for 55-60% of the total mass of the fuel A, and the biomass carbon powder accounts for 40-45% of the total mass of the fuel A;
b) the sintering raw material and the fuel B are subjected to primary mixing and secondary mixing granulation to form a sintering mixture B, wherein the addition mass percentage of the fuel B is 4-5%; adding 4-5.5 wt% of pulverization inhibitor during the second mixing granulation; the fuel B is formed by mixing coke powder and biomass carbon powder, wherein the coke powder accounts for 60-65% of the total mass of the fuel B, and the biomass carbon powder accounts for 35-40% of the total mass of the fuel B;
c) the sintering raw material and the fuel C are subjected to primary mixing and secondary mixing granulation to form a sintering mixture C, wherein the addition mass percentage of the fuel C is 5-6%; adding 4.5-6 wt% of pulverization inhibitor during the second mixing granulation; the fuel C consists of coke powder and anthracite, wherein the coke powder accounts for 70-85% of the total mass of the fuel C, and the anthracite accounts for 15-30% of the total mass of the fuel C;
(2) layering and distributing: firstly, adding a sintering mixture A cloth on a sintering trolley as a bottom layer sintering material, wherein the cloth thickness is 250-300 mm; then adding the sintering mixture B cloth to the bottom layer sintering material to be used as a middle layer sintering material, wherein the cloth thickness is 350-450 mm; finally, adding the sintering mixture C cloth to the middle-layer sintering material to serve as an upper-layer sintering material, wherein the cloth thickness is 200-250 mm;
(3) ignition, air draft and sintering: and after all three sintering mixtures are added, igniting and exhausting air for sintering to obtain a finished sintering ore, wherein the ignition temperature is 1000-1100 ℃, and the negative pressure of the exhausting air is 12-20 kpa.
The pulverization inhibitor is Fe in percentage by mass2O320 to 30 percent of Fe3O415-20 percent of the total weight of the composition, 4-12 percent of CaO and SiO220 to 25 percent of Al2O3The content is 0.5-2%, the content of MgO is 0.5-2.5%, and the content of BaO is 10-15%％，B2O3The content is 10-15%.
The pulverization inhibitor has a granularity of less than 200 meshes and accounts for more than 90%, and is added in a mode of spraying the pulverization inhibitor and atomized water on the surface of a rolling mixture simultaneously in a gas conveying mode.
The fuels A and B are premixed with quicklime uniformly before adding, and atomized water is added for wetting and granulating, wherein the mass fraction of the fuels is 85-90%, and the mass fraction of the quicklime is 10-15%.
The mass percentage of the moisture of the sintering mixture A is 6.5-7%, the mass percentage of the moisture of the sintering mixture B is 7-7.5%, and the mass percentage of the moisture of the sintering mixture C is 7.5-8%.
The alkalinity of the sintering mixture A, the alkalinity of the sintering mixture B and the alkalinity of the sintering mixture C are the same, and the alkalinity is 1.8-2.2.
Compared with the prior art, the invention has the beneficial effects that: 1) the invention optimizes the composition and proportion of fuel in each layer of mixture through layered distribution, balances the heat distribution of each layer and the mineral composition of the sinter, and can improve the low-temperature reduction degradation performance of the sinter. 2) The invention can realize the purpose of greatly improving the low-temperature reduction degradation rate of the sinter under the condition of not spraying halide by adding and spraying the special degradation inhibitor during the granulation of each layer of mixture. 3) The invention pretreats the fuels A and B, can improve the combustion characteristics, improves the low-temperature reduction pulverization of the sinter and increases the use amount of low-price fuels.
Detailed Description
The following description is given with reference to specific examples:
example 1
A method for improving low-temperature reduction powdering property of sinter comprises the steps of carrying out primary mixing and secondary mixing granulation on a sintering raw material and a fuel A to form a sintering mixture A, wherein the addition mass percentage of the fuel A is 3.2%; the fuel A is formed by mixing anthracite and biomass carbon powder, wherein the anthracite accounts for 57% of the total mass of the fuel A, and the biomass carbon powder accounts for 43% of the total mass of the fuel A; adding 2.8% of pulverization inhibitor during the second mixing granulation; the binary alkalinity of the mixture A was 1.9, and the moisture was 6.6%.
The sintering raw material and the fuel B are subjected to primary mixing and secondary mixing granulation to form a sintering mixture B, wherein the addition mass percentage of the fuel B is 4.2%; the fuel B is formed by mixing coke powder and biomass carbon powder, wherein the coke powder accounts for 62% of the total mass of the fuel B, and the biomass carbon powder accounts for 38% of the total mass of the fuel B; adding 4.3% of pulverization inhibitor during the second mixing granulation; the binary alkalinity of the mixture B was 1.9, and the moisture was 7.1%.
The sintering raw material and the fuel C are subjected to primary mixing and secondary mixing granulation to form a sintering mixture C, wherein the addition mass percentage of the fuel C is 5.1%; the fuel C consists of coke powder and anthracite, wherein the coke powder accounts for 77% of the total mass of the fuel C, and the anthracite accounts for 23% of the total mass of the fuel C; adding 4.7% of pulverization inhibitor during the second mixing granulation; the binary alkalinity of the mixture C was 1.9, and the moisture was 7.8%.
Firstly, adding a sintering mixture A cloth on a sintering trolley as a bottom layer sintering material, wherein the cloth thickness is 260 mm; then adding the sintering mixture B cloth on the bottom layer sintering material to be used as a middle layer sintering material, wherein the cloth thickness is 400 mm; finally, adding the sintering mixture C cloth on the middle-layer sintering material as an upper-layer sintering material, wherein the cloth thickness is 220 mm; and after all three sintering mixtures are added, igniting and exhausting air for sintering to obtain a finished sintering ore, wherein the ignition temperature is 1020 ℃, and the negative pressure of the exhausting air is 16 kpa.
The sintering fuel (A and B) is premixed with the quicklime uniformly before adding, and atomized water is added for wetting and granulating, wherein the mass fraction of the fuel is 90%, and the mass fraction of the quicklime is 10%. The pulverization inhibitor comprises the following chemical components in percentage by mass: fe2O326% of Fe3O419% of CaO, 6.5% of SiO2Content of 25% Al2O31.5% of MgO, 11% of BaO, B2O3The content is 10%. The addition mode of the pulverization inhibitor is that during the two-mixing granulation, the pulverization inhibitor and atomized water are sprayed on the surface of the rolling mixture simultaneously in a gas conveying mode.
Compared with the sintered ore obtained by the traditional method, the sintered ore obtained by the invention has low temperatureReduction degradation Rate (RDI)+3.15) The yield is improved to 82.6% from 72.5% in the traditional method, and is improved by 10.1 percentage points; the drum strength of the sintered ore is improved from 76.4 percent of that of the traditional method to 84.8 percent, and the drum strength is improved by 8.4 percent.
Example 2
A method for improving low-temperature reduction powdering property of sinter comprises the steps of carrying out primary mixing and secondary mixing granulation on a sintering raw material and a fuel A to form a sintering mixture A, wherein the addition mass percentage of the fuel A is 3.9%; the fuel A is formed by mixing anthracite and biomass carbon powder, wherein the anthracite accounts for 59% of the total mass of the fuel A, and the biomass carbon powder accounts for 41% of the total mass of the fuel A; adding 3.8% of pulverization inhibitor during the second mixing granulation; the binary alkalinity of the mixture A was 2.1, and the moisture was 7%.
The sintering raw material and the fuel B are subjected to primary mixing and secondary mixing granulation to form a sintering mixture B, wherein the addition mass percentage of the fuel B is 4.8%; the fuel B is formed by mixing coke powder and biomass carbon powder, wherein the coke powder accounts for 64% of the total mass of the fuel B, and the biomass carbon powder accounts for 36% of the total mass of the fuel B; adding 5.4% of pulverization inhibitor during the second mixing granulation; the binary alkalinity of the mixture B was 2.1, and the moisture was 7.3%.
The sintering raw material and the fuel C are subjected to primary mixing and secondary mixing granulation to form a sintering mixture C, wherein the addition mass percentage of the fuel C is 5.6%; the fuel C consists of coke powder and anthracite, wherein the coke powder accounts for 83% of the total mass of the fuel C, and the anthracite accounts for 17% of the total mass of the fuel C; adding 5.7% of pulverization inhibitor during the second mixing granulation; the binary alkalinity of the mixture C was 2.1, and the moisture was 7.6%.
Firstly, adding a sintering mixture A cloth on a sintering trolley as a bottom layer sintering material, wherein the cloth thickness is 300 mm; then adding the sintering mixture B cloth on the bottom layer sintering material to be used as a middle layer sintering material, wherein the cloth thickness is 400 mm; and finally, adding the sintering mixture C cloth on the middle-layer sintering material to serve as an upper-layer sintering material, wherein the cloth thickness is 250 mm. And after the three sintering mixtures are completely added, igniting and exhausting air for sintering to obtain a finished sintering ore, wherein the ignition temperature is 1080 ℃, and the negative pressure of the exhausting air is 18 kpa.
The sintering fuels (A and B) are mixed withAnd uniformly premixing quicklime, and adding atomized water to wet and granulate, wherein the mass fraction of the fuel is 85%, and the mass fraction of the quicklime is 15%. The pulverization inhibitor comprises the following chemical components in percentage by mass: fe2O322% of Fe3O416% of CaO, 10% of CaO, SiO2Content of 22% Al2O31% of MgO, 13% of BaO, B2O3The content was 14%. The addition mode of the pulverization inhibitor is that during the two-mixing granulation, the pulverization inhibitor and atomized water are sprayed on the surface of the rolling mixture simultaneously in a gas conveying mode.
Compared with the sintered ore obtained by the traditional method, the sintered ore obtained by the invention has low temperature reduction degradation Rate (RDI)+3.15) The yield is increased from 74.8% of the traditional method to 84.2%, and is increased by 9.4 percentage points; the drum strength of the sintered ore is improved from 75.4 percent of that of the traditional method to 84.5 percent, and is improved by 9.1 percent.

Claims (6)

1. A method for improving low-temperature reduction pulverization of sinter is characterized by comprising the following steps: the method comprises the following steps of distributing materials in three layers, wherein the types and the proportions of fuels in each layer of sintering materials are different, and a pulverization inhibitor is added into each layer in a certain proportion, and the method comprises the following specific steps:
(1) mixing materials:
a) the sintering raw material and the fuel A are subjected to primary mixing and secondary mixing granulation to form a sintering mixture A, wherein the addition mass percentage of the fuel A is 3-4%; adding 2.5-4% of pulverization inhibitor in percentage by mass during the second mixing granulation; the fuel A is formed by mixing anthracite and biomass carbon powder, wherein the anthracite accounts for 55-60% of the total mass of the fuel A, and the biomass carbon powder accounts for 40-45% of the total mass of the fuel A;
b) the sintering raw material and the fuel B are subjected to primary mixing and secondary mixing granulation to form a sintering mixture B, wherein the addition mass percentage of the fuel B is 4-5%; adding 4-5.5 wt% of pulverization inhibitor during the second mixing granulation; the fuel B is formed by mixing coke powder and biomass carbon powder, wherein the coke powder accounts for 60-65% of the total mass of the fuel B, and the biomass carbon powder accounts for 35-40% of the total mass of the fuel B;
c) the sintering raw material and the fuel C are subjected to primary mixing and secondary mixing granulation to form a sintering mixture C, wherein the addition mass percentage of the fuel C is 5-6%; adding 4.5-6 wt% of pulverization inhibitor during the second mixing granulation; the fuel C consists of coke powder and anthracite, wherein the coke powder accounts for 70-85% of the total mass of the fuel C, and the anthracite accounts for 15-30% of the total mass of the fuel C;
(2) layering and distributing: firstly, adding a sintering mixture A cloth on a sintering trolley as a bottom layer sintering material, wherein the cloth thickness is 250-300 mm; then adding the sintering mixture B cloth to the bottom layer sintering material to be used as a middle layer sintering material, wherein the cloth thickness is 350-450 mm; finally, adding the sintering mixture C cloth to the middle-layer sintering material to serve as an upper-layer sintering material, wherein the cloth thickness is 200-250 mm;
(3) ignition, air draft and sintering: and after all three sintering mixtures are added, igniting and exhausting air for sintering to obtain a finished sintering ore, wherein the ignition temperature is 1000-1100 ℃, and the negative pressure of the exhausting air is 12-20 kpa.
2. The method for improving the low-temperature reduction powdering property of sintered ore according to claim 1, wherein: the pulverization inhibitor is Fe in percentage by mass2O320 to 30 percent of Fe3O415-20 percent of the total weight of the composition, 4-12 percent of CaO and SiO220 to 25 percent of Al2O30.5-2 percent of the total content, 0.5-2.5 percent of MgO, 10-15 percent of BaO and B2O3The content is 10-15%.
3. The method for improving the low-temperature reduction powdering property of sintered ore according to claim 1, wherein: the pulverization inhibitor has a granularity of less than 200 meshes and accounts for more than 90 percent of the mass percent, and the addition mode is that the pulverization inhibitor and atomized water are sprayed on the surface of a rolling mixture simultaneously in a gas conveying mode.
4. The method for improving the low-temperature reduction powdering property of sintered ore according to claim 1, wherein: and fuels A and B are premixed with quicklime uniformly before adding, and atomized water is added for wetting and granulating, wherein the mass fraction of the fuels is 85-90%, and the mass fraction of the quicklime is 10-15%.
5. The method for improving the low-temperature reduction powdering property of sintered ore according to claim 1, wherein: the mass percentage of the moisture of the sintering mixture A is 6.5-7%, the mass percentage of the moisture of the sintering mixture B is 7-7.5%, and the mass percentage of the moisture of the sintering mixture C is 7.5-8%.
6. The method for improving the low-temperature reduction powdering property of sintered ore according to claim 1, wherein: the alkalinity of the sintering mixture A, the alkalinity of the sintering mixture B and the alkalinity of the sintering mixture C are the same, and the alkalinity is 1.8-2.2.
CN201911028007.3A 2019-10-28 2019-10-28 Method for improving low-temperature reduction powdering property of sinter Pending CN110819794A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201911028007.3A CN110819794A (en) 2019-10-28 2019-10-28 Method for improving low-temperature reduction powdering property of sinter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201911028007.3A CN110819794A (en) 2019-10-28 2019-10-28 Method for improving low-temperature reduction powdering property of sinter

Publications (1)

Publication Number Publication Date
CN110819794A true CN110819794A (en) 2020-02-21

Family

ID=69550750

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201911028007.3A Pending CN110819794A (en) 2019-10-28 2019-10-28 Method for improving low-temperature reduction powdering property of sinter

Country Status (1)

Country Link
CN (1) CN110819794A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112760479A (en) * 2020-12-27 2021-05-07 中南大学 Sintering method for improving quality of vanadium-titanium sintered mineral product

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107365907A (en) * 2017-06-27 2017-11-21 西安建筑科技大学 A kind of method for improving iron ore sintering mine low temperature reduction degradation
CN108754131A (en) * 2018-06-14 2018-11-06 鞍钢股份有限公司 A kind of sintering production method of optimization fuel collocation

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107365907A (en) * 2017-06-27 2017-11-21 西安建筑科技大学 A kind of method for improving iron ore sintering mine low temperature reduction degradation
CN108754131A (en) * 2018-06-14 2018-11-06 鞍钢股份有限公司 A kind of sintering production method of optimization fuel collocation

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112760479A (en) * 2020-12-27 2021-05-07 中南大学 Sintering method for improving quality of vanadium-titanium sintered mineral product

Similar Documents

Publication Publication Date Title
CN108754131B (en) Sintering production method for optimizing fuel matching
CN109423555B (en) Efficient iron ore sintering method using low-silicon iron fine powder
CN102102146B (en) Method for sintering high-aluminum refractory limonite
CN104726696B (en) Middle basicity deep-bed sintering production method
CN109652643B (en) High-quality sinter for COREX smelting reduction iron-making process and preparation method thereof
CN108950189B (en) method for producing MgO-containing sintered ore by using waste magnesia carbon bricks
CN109055731B (en) Dust granulation process and iron ore sintering process
CN101613798B (en) Puddling additive and predation method thereof
CN112301215A (en) Iron ore concentrate for improving low-temperature reduction degradation rate of iron ore sinter and preparation method thereof
CN111100981B (en) Method for improving metallurgical performance of manganese-rich slag smelted manganese sinter
CN101994002B (en) Method for sintering ore blending of Jianshan concentrate fines and limonite
CN110819794A (en) Method for improving low-temperature reduction powdering property of sinter
CN102367513A (en) Method for removing potassium and sodium from ironmaking sintering ore
CN107142120A (en) A kind of high response coke and preparation method thereof
CN103173591B (en) Foundry ladle covering agent
CN103451418A (en) Production method of sintered ores
CN103468935A (en) Production method of sintering ores containing lump ores with high crystal water
CN112760479B (en) Sintering method for improving quality of vanadium-titanium sintered mineral product
CN107641709A (en) A kind of sintering method for reducing burnup
CN100582256C (en) Method for preparing low-silicon superhigh-alkalinity sintered ore
CN112853192A (en) Method for producing ferrosilicon by using blended small-granularity silica
CN115369238B (en) Method for producing sintered ore capable of rapidly improving low-temperature reduction degradation index of sintered ore
CN111321291A (en) Preparation method of low-silicon low-alkalinity sinter
CN107326174B (en) A kind of method of large-type sinterer sintering high-chromic vanadium-titanium ferroferrite
CN112824547A (en) Method for producing sintered ore from high-alumina iron ore powder

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: 20200221