CN113005284B - Application method of titanium-containing sea sand in sinter production - Google Patents
Application method of titanium-containing sea sand in sinter production Download PDFInfo
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- CN113005284B CN113005284B CN202110111164.1A CN202110111164A CN113005284B CN 113005284 B CN113005284 B CN 113005284B CN 202110111164 A CN202110111164 A CN 202110111164A CN 113005284 B CN113005284 B CN 113005284B
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- 239000004576 sand Substances 0.000 title claims abstract description 33
- 239000010936 titanium Substances 0.000 title claims abstract description 22
- 238000000034 method Methods 0.000 title claims abstract description 21
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 title claims abstract description 20
- 229910052719 titanium Inorganic materials 0.000 title claims abstract description 20
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 12
- 238000005245 sintering Methods 0.000 claims abstract description 84
- 239000000843 powder Substances 0.000 claims abstract description 26
- 239000000203 mixture Substances 0.000 claims abstract description 22
- 230000009467 reduction Effects 0.000 claims abstract description 17
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 15
- 239000000463 material Substances 0.000 claims abstract description 11
- 239000004449 solid propellant Substances 0.000 claims abstract description 9
- 229910052742 iron Inorganic materials 0.000 claims abstract description 7
- 238000002156 mixing Methods 0.000 claims abstract description 6
- 239000012141 concentrate Substances 0.000 claims abstract description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 5
- 230000001276 controlling effect Effects 0.000 claims description 26
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 16
- 239000000292 calcium oxide Substances 0.000 claims description 8
- 235000012255 calcium oxide Nutrition 0.000 claims description 8
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 6
- 239000003546 flue gas Substances 0.000 claims description 6
- 239000001095 magnesium carbonate Substances 0.000 claims description 6
- 235000014380 magnesium carbonate Nutrition 0.000 claims description 6
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 claims description 6
- 229910000021 magnesium carbonate Inorganic materials 0.000 claims description 6
- 238000009826 distribution Methods 0.000 claims description 4
- 230000004907 flux Effects 0.000 claims description 4
- 239000003034 coal gas Substances 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 3
- 239000000428 dust Substances 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 238000005204 segregation Methods 0.000 claims description 3
- 239000002912 waste gas Substances 0.000 claims description 3
- 230000000977 initiatory effect Effects 0.000 claims 1
- 239000002253 acid Substances 0.000 abstract description 16
- 229910052500 inorganic mineral Inorganic materials 0.000 abstract description 8
- 239000011707 mineral Substances 0.000 abstract description 8
- 230000015556 catabolic process Effects 0.000 abstract description 6
- 238000006731 degradation reaction Methods 0.000 abstract description 6
- 238000007254 oxidation reaction Methods 0.000 abstract description 4
- 230000003647 oxidation Effects 0.000 abstract description 3
- 230000008901 benefit Effects 0.000 abstract description 2
- 239000007787 solid Substances 0.000 abstract description 2
- 238000009770 conventional sintering Methods 0.000 abstract 1
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 7
- 235000010755 mineral Nutrition 0.000 description 6
- 230000009286 beneficial effect Effects 0.000 description 4
- 239000003245 coal Substances 0.000 description 3
- 239000000571 coke Substances 0.000 description 3
- 239000000446 fuel Substances 0.000 description 3
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 3
- 239000007791 liquid phase Substances 0.000 description 3
- 238000006467 substitution reaction Methods 0.000 description 3
- 229910004298 SiO 2 Inorganic materials 0.000 description 2
- 230000002378 acidificating effect Effects 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000012216 screening Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000005338 heat storage Methods 0.000 description 1
- 229910052595 hematite Inorganic materials 0.000 description 1
- 239000011019 hematite Substances 0.000 description 1
- LIKBJVNGSGBSGK-UHFFFAOYSA-N iron(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Fe+3].[Fe+3] LIKBJVNGSGBSGK-UHFFFAOYSA-N 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 238000005979 thermal decomposition reaction Methods 0.000 description 1
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- 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
-
- 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
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- 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)
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Abstract
The invention provides an application method of titanium-containing sea sand in sinter production, which comprises the following steps: sintering iron-containing coarse mineral powder, concentrate powder and sintering fluxUniformly mixing the sintered solid fuel and the titanium-containing sea sand ore powder, and adding water to prepare a sintered mixture; and sintering the sintering mixture under a high-temperature sintering condition. The invention can solve the application problem of sea sand mineral powder in sintering, improve the use proportion of sea sand and increase the enterprise benefit. Improve the influence of sea placer used in conventional sintering on the metallurgical performance of the sinter and improve the low-temperature reduction degradation index RDI of the sinter +3.15 More than 8 percent and improves the reduction index RI by more than 10 percent. The quality of the sintered ore material is improved, and the drum index of the sintered ore is improved by about 2 percent. The oxidation sensible heat of the sea sand ore is fully utilized, and the burning consumption of the sintered solid is reduced by about 2 kg/t. For the blast furnace with furnace protection requirement, T i in the acid sinter is effectively utilized by adding the acid sinter in proper proportion, so that the purpose of furnace protection is achieved. The high-price furnace protection titanium ball is avoided being bought, and the cost is saved.
Description
Technical Field
The invention relates to the technical field of iron ore sintering, in particular to an application method of titanium-containing sea sand in sinter production.
Background
The sea placer is titanium-containing magnetite powder with high cost performance, and the cost can be reduced by sintering the titanium-containing sea placer. But the sintering basic characteristics of the sea sand ore are poor, the titanium in the sea sand can cause adverse effects on the production and quality of the high-alkali sintering ore,cause the drum index and the low-temperature reduction degradation index RDI of the high-alkali sinter +3.15 The reduction, the increase of the return ore rate and the reduction of the yield are not beneficial to the stable production of the subsequent blast furnace. In order to stabilize the yield and quality of the sintered ore, the use ratio of the sea sand ore in sintering is generally controlled below 3%.
Disclosure of Invention
In view of the above-mentioned shortcomings in the prior art, the present invention provides an application method of titanium-containing sea sand in sinter production, so as to solve the above-mentioned technical problems.
In a first aspect, the present invention provides a method for applying titanium-containing sea sand in sinter production, comprising:
uniformly mixing the sintered iron-containing coarse ore powder, the concentrate powder, the sintering flux, the sintered solid fuel and the titanium-containing sea sand ore powder, and adding water to prepare a sintering mixture;
and sintering the sintering mixture under a high-temperature sintering condition.
Further, the high-temperature sintering conditions include:
the binary alkalinity CaO/SiO of the sinter is controlled by adjusting the binary alkalinity of the sinter through quick lime 2 Less than 0.8 times; SiO of sintered ore 2 The content is controlled to be 6.5 +/-0.5 percent; FeO of the sinter is controlled to be 14 +/-2.0%; regulating the MgO content of the sintering ore by magnesite powder, and controlling the MgO content of the sintering ore to be 3.0-4.0%; the sintering negative pressure is controlled to be minus 15 +/-1 kpa; the material temperature of the sintering mixture is more than 65 ℃; controlling the sintering ignition negative pressure to be 50-60 percent; controlling the temperature of sintering waste gas to be 140 +/-20 ℃; sintering end point temperature control position: the penultimate bellows; controlling the sintering end point temperature: 480 +/-20 ℃; the sinter bed is controlled to be more than 700 mm.
Further, the method further comprises:
by adding a certain amount of MgCO into the sintering material 3 The reduction performance is improved.
Further, the method further comprises:
placing the sintering mixture in a small ore tank bin, and introducing steam into the small ore tank; the temperature of the mixture is enabled to reach more than 65 ℃;
controlling segregation distribution of a small ore tank bin;
controlling the ignition negative pressure of the sintering machine to be micro negative pressure;
controlling the load of the sintering single-roll crusher;
controlling sinter screening grade
Further, the starting of the ignition process includes:
igniting by introducing coal gas, starting air draft, starting dust removal, starting flue gas treatment, and discharging the treated flue gas.
Further, the method further comprises:
the proportion of the sea sand ore in the sintering mixture is not more than 20%.
Further, the method further comprises:
the suitable proportion of the sea placer in the sintering mixture is 15 +/-2%.
The invention has the beneficial effects that:
the application method of the titanium-containing sea sand in the sinter production provided by the invention can solve the application problem of the sea sand mineral powder in sintering, improve the use proportion of the sea sand and increase the enterprise benefit. Improve the influence of sea placer used for sintering on the metallurgical performance of the sintered ore and improve the RDI (powder index of low-temperature reduction) of the sintered ore +3.15 More than 8 percent and improves the reduction index RI by more than 10 percent. The quality of the sintered ore material is improved, and the drum index of the sintered ore is improved by about 2 percent. The oxidation sensible heat of the sea sand ore is fully utilized, and the burning consumption of the sintered solid is reduced by about 2 kg/t. For a blast furnace with furnace protection requirements, the Ti in the acidic sinter ore is effectively utilized by adding the acidic sinter ore in a proper proportion, so that the purpose of furnace protection is achieved. The purchase of expensive furnace protection titanium balls is avoided, and the cost is saved.
In addition, the invention has reliable design principle, simple structure and very wide application prospect.
Drawings
In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present invention, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
FIG. 1 is a schematic sintering flow diagram of a method according to an embodiment of the invention.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention, and it is obvious that the described embodiment is only a part of the embodiment of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Specifically, the application method of the titanium-containing sea sand in the sinter production comprises the following steps:
and uniformly mixing the sintered iron-containing coarse mineral powder, the concentrate powder, the sintering flux, the sintered solid fuel and the titanium-containing sea sand mineral powder according to a certain proportion, and adding water for mixing to prepare a sintering mixture.
(1) RDI (remote data interface) for improving low-temperature reduction degradation performance +3.15 . TiO in mineral powder by using high-temperature sintering condition 2 The high-strength titanomagnetite is generated under the condition of high temperature (more than 1300 ℃), and the low-temperature reduction degradation rate of the sinter can be reduced. In addition, due to the low content of the acid sintering CaO, the influence of perovskite generation on low-temperature reduction degradation of the sintering ore can be reduced.
(2) Improve the reduction performance RI. The acid sinter has compact structure and low reduction degree (RI), and a certain amount of MgCO can be added into the sinter 3 ，MgCO 3 Decompose to release CO 2 Then, the gas flow channel can increase the porosity of the sintered ore, thereby improving the reduction degree of the sintered ore; mg of MgO 2+ The lattice structure of magnetite can be stabilized, and the production of hematite is reduced, so that the low-temperature reduction degradation of sinter can be reduced; MgCO 3 The thermal decomposition temperature is low, the decomposition is completed in the sintering preheating drying zone, and the heat consumed by the decomposition is automatic heat storage, thereby being beneficial to the homogeneous sintering.
(3) The strength of the rotary drum is improved. SiO 2 2 Is acid sinteringThe main constituent of the mineral liquid phase, SiO 2 The content is less than 5.8 percent, the liquid phase amount of the sintering ore is less, the strength of the sintering ore is poor, and SiO is 2 The content exceeds 7.0 percent, the sintering ore liquid phase is too much, the brittleness is increased, the strength is reduced, and the SiO in the common acid sintering ore 2 The content is controlled to be 6.5 +/-0.5 percent.
(4) And the solid fuel consumption is reduced. The sea sand ore belongs to magnetite, the FeO content is high, and the FeO is subjected to oxidation reaction in sintering and releases heat, so that the sintering solid fuel consumption is reduced.
The high-temperature sintering conditions in this example include: adjusting the binary alkalinity of the sinter by quicklime, and controlling the binary alkalinity of the sinter to be less than 0.8 time; SiO of sintered ore 2 The content is controlled to be 6.5 +/-0.5 percent; controlling FeO of the sintered ore to be 14% +/-2.0; regulating the MgO content of the sinter by magnesite powder, and controlling the MgO content of the sinter to be 3.0-4.0%; the sintering negative pressure is controlled to be minus 15 +/-1 kpa; the material temperature of the sintering mixture is more than 65 ℃; controlling the sintering ignition negative pressure to be 50-60 percent; controlling the temperature of sintering waste gas to be 140 +/-20 ℃; sintering end point temperature control position: the penultimate bellows; controlling the sintering end point temperature: 480 +/-20 ℃; the sinter bed is controlled to be more than 700 mm.
The sintering process is shown in fig. 1 and comprises the following steps:
adding water to and mixing the sintered iron-containing coarse ore powder, the concentrate powder, the sintering flux, the sintered solid fuel and the titanium-containing sea sand ore powder twice to obtain a sintered mixture;
placing the sintering mixture in a small ore tank bin, and introducing steam into the small ore tank; the temperature of the mixture is enabled to reach more than 65 ℃;
controlling segregation distribution of a small ore tank bin;
controlling the sintering machine to start an ignition program, namely igniting by introducing coal gas, starting air draft, starting dust removal, starting flue gas treatment and discharging the treated flue gas;
controlling the load of the sintering single-roll crusher;
and (3) screening the sintered ore after the sintered ore is cooled, taking the screened particle fraction smaller than 5mm as circulating return ore, adding the circulating return ore into the sintered mixture, taking the particle fraction of 8-20mm as auxiliary bottom material, and feeding the rest into a blast furnace ore trough.
The following is the experimental protocol:
according to the first scheme, the sea sand ore is used for replacing fine powder in the same proportion, the fuel is decreased gradually according to 0.1%, and the MgO of the acid sinter is kept constant.
1. Auxiliary material structure (%)
| Quick lime | Magnesite stone | Jin coal | |
| Control group | 2.1 | 1.9 | 6.0 |
| Scheme 1 | 2.0 | 1.8 | 5.9 |
| Scheme 2 | 2.0 | 1.7 | 5.8 |
| Scheme 3 | 2.0 | 1.6 | 5.7 |
| Scheme 4 | 2.0 | 1.4 | 5.6 |
| Scheme 5 | 2.0 | 1.3 | 5.5 |
| Scheme 6 | 2.0 | 1.2 | 5.4 |
2. Mineral distribution structure (%)
3. Index comparison
From the comparison result of the first scheme, under the condition that the acid sinter R and FeO are kept unchanged, when the mixture ratio of the sea sand ore reaches about 14% and does not exceed 20%, the sintering ore solid fuel consumption is reduced by 4.7%, and the RDI +3.15 The increase is 8.6 percent, and the drum index is increased by 3.2 percent; when the sea sand ore ratio is 20%, the RDI of the acid sinter ore +3.15 And the tumbler index is reduced, which indicates that the sea sand proportion is not more than 20 percent and is more suitable about 15 percent under the current raw material condition.
In the second scheme, the sea sand ore proportion is constant by 15%, and the MgO content of the acid sinter is increased from 1.5% to 4.5%.
1. Auxiliary material structure (%)
| Name of a brand | Quicklime powder | Magnesite powder | Fuel |
| Control group | 2.4 | 1.8 | 5.5 |
| Scheme 1 | 2.4 | 2.9 | 5.5 |
| Scheme 2 | 2.2 | 4.7 | 5.5 |
| Scheme 3 | 2.2 | 5.3 | 5.5 |
| Scheme 4 | 2.2 | 6.0 | 5.5 |
| Scheme 5 | 2.4 | 7.0 | 5.5 |
| Scheme 6 | 2.2 | 8.5 | 5.5 |
2. Index comparison
The second scheme aims at improving the RI of the acid sinter. The data show that after MgO is increased by using magnesite in the acid sinter, the RDI of the acid sinter is +3.15 Still can be kept above 75 percent, and RI is obviously improved by about 12 percent on average, thus achieving the purpose of improvement.
As can be seen from the above test protocol, the FeO content of 1, sea sand ore was 28.32%, and the conversion to Fe was carried out for every 1kg of FeO 2 O 3 The released heat was 1973 joules of heat corresponding to the heat released by combustion of 0.067kg standard coal. The sensible heat of oxidation of 1% of the sea sand during sintering corresponds to the sensible heat of combustion of 0.18kg of coal. The sea sand ore proportion is improved by 12 percent, and the sintering solid fuel consumption is reduced by about 2.16 kg/t. The fuel price is calculated according to 800 yuan/t, so that the sintering cost is reduced by 1.7 yuan/ton. 2. The coke ratio can be reduced by 5 percent according to the improvement of 10 percent of the reduction degree: the use ratio of the blast furnace acid ore is 10 percent, so that the coke ratio can be reduced by 0.5 kg/t. Calculated according to 1800 yuan/t of coke, the cost of the molten iron is reduced by 0.9 yuan/t. 3. The Ti content of the acid sintering ore is increased, and the acid sintering ore with proper proportion can be used for the blast furnace for protecting the furnace according to the requirement of protecting the furnace, so that the high-price titanium-containing furnace protecting material is avoided from being bought, and the running cost of the blast furnace is reduced. 4. Test data show thatThe method of the invention can improve the drum index of the sinter and the strength of the sinter, and is beneficial to the stable and smooth operation of the blast furnace.
Although the present invention has been described in detail in connection with the preferred embodiments with reference to the accompanying drawings, the present invention is not limited thereto. Various equivalent modifications or substitutions can be made on the embodiments of the present invention by those skilled in the art without departing from the spirit and scope of the present invention, and these modifications or substitutions are within the scope of the present invention/any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (4)
1. An application method of titanium-containing sea sand in sinter production is characterized by comprising the following steps:
uniformly mixing the sintered iron-containing coarse ore powder, the concentrate powder, the sintering flux, the sintered solid fuel and the titanium-containing sea sand ore powder, and adding water to prepare a sintering mixture;
sintering the sintering mixture under a high-temperature sintering condition;
wherein the high-temperature sintering conditions include:
the binary alkalinity of the sinter is adjusted by quicklime, and the binary alkalinity CaO/SiO of the sinter is controlled 2 Less than 0.8 times; SiO of sintered ore 2 The content is controlled to be 6.5 +/-0.5 percent; controlling FeO of the sintered ore to be 14% +/-2.0; regulating the MgO content of the sintering ore by magnesite powder, and controlling the MgO content of the sintering ore to be 3.0-4.0%; the sintering negative pressure is controlled to be minus 15 +/-1 kPa; the material temperature of the sintering mixture is more than 65 ℃; controlling the sintering ignition negative pressure to be 50-60 percent; controlling the temperature of sintering waste gas to be 140 +/-20 ℃; sintering end point temperature control position: the penultimate bellows; controlling the sintering end point temperature: 480 +/-20 ℃; the sinter bed is controlled to be more than 700 mm;
the method further comprises the following steps:
the suitable proportion of the sea placer in the sintering mixture is 15 +/-2%.
2. The method of claim 1, further comprising:
by adding MgCO into the sintering material 3 The reduction performance of the sinter is improved.
3. The method of claim 1, further comprising:
placing the sintering mixture in a small ore tank bin, and introducing steam into the small ore tank to enable the temperature of the mixture to reach more than 65 ℃;
controlling segregation distribution of a small ore tank bin;
controlling the ignition of the sintering machine, wherein the negative pressure is micro negative pressure;
controlling the load of the sintering single-roll crusher;
and controlling the size fraction of the sintered ore sieve.
4. The method of claim 3, wherein initiating the ignition sequence comprises:
igniting by introducing coal gas, starting air draft, starting dust removal, starting flue gas treatment, and discharging the treated flue gas.
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