CN115354214A - Method for producing weathering steel with low energy consumption, low carbon emission and low cost - Google Patents
Method for producing weathering steel with low energy consumption, low carbon emission and low cost Download PDFInfo
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- CN115354214A CN115354214A CN202211210261.7A CN202211210261A CN115354214A CN 115354214 A CN115354214 A CN 115354214A CN 202211210261 A CN202211210261 A CN 202211210261A CN 115354214 A CN115354214 A CN 115354214A
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- 229910000870 Weathering steel Inorganic materials 0.000 title claims abstract description 33
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 33
- 238000005265 energy consumption Methods 0.000 title claims abstract description 21
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims description 21
- 229910052799 carbon Inorganic materials 0.000 title claims description 20
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 174
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 116
- 238000000034 method Methods 0.000 claims abstract description 41
- 239000000843 powder Substances 0.000 claims abstract description 38
- 230000008569 process Effects 0.000 claims abstract description 32
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 30
- 239000010959 steel Substances 0.000 claims abstract description 30
- 238000005245 sintering Methods 0.000 claims abstract description 27
- 238000003723 Smelting Methods 0.000 claims abstract description 26
- 229910001710 laterite Inorganic materials 0.000 claims abstract description 17
- 239000011504 laterite Substances 0.000 claims abstract description 17
- 238000007664 blowing Methods 0.000 claims abstract description 16
- 239000002893 slag Substances 0.000 claims abstract description 14
- 238000007670 refining Methods 0.000 claims abstract description 12
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims abstract description 10
- RHZUVFJBSILHOK-UHFFFAOYSA-N anthracen-1-ylmethanolate Chemical compound C1=CC=C2C=C3C(C[O-])=CC=CC3=CC2=C1 RHZUVFJBSILHOK-UHFFFAOYSA-N 0.000 claims abstract description 5
- 239000003830 anthracite Substances 0.000 claims abstract description 5
- 239000000292 calcium oxide Substances 0.000 claims abstract description 5
- 235000012255 calcium oxide Nutrition 0.000 claims abstract description 5
- 239000002994 raw material Substances 0.000 claims abstract description 5
- 238000007885 magnetic separation Methods 0.000 claims abstract description 4
- 230000009467 reduction Effects 0.000 abstract description 6
- 230000007613 environmental effect Effects 0.000 abstract 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 26
- 229910052742 iron Inorganic materials 0.000 description 13
- 229910000863 Ferronickel Inorganic materials 0.000 description 10
- 229910045601 alloy Inorganic materials 0.000 description 10
- 239000000956 alloy Substances 0.000 description 10
- 239000000203 mixture Substances 0.000 description 10
- 239000000463 material Substances 0.000 description 7
- 238000001816 cooling Methods 0.000 description 5
- 239000003245 coal Substances 0.000 description 4
- 238000002156 mixing Methods 0.000 description 3
- 230000035699 permeability Effects 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000009749 continuous casting Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000002920 hazardous waste Substances 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000007726 management method Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 235000010755 mineral Nutrition 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 238000012216 screening Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 229910000990 Ni alloy Inorganic materials 0.000 description 1
- 229910018487 Ni—Cr Inorganic materials 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 229910000963 austenitic stainless steel Inorganic materials 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- VNNRSPGTAMTISX-UHFFFAOYSA-N chromium nickel Chemical compound [Cr].[Ni] VNNRSPGTAMTISX-UHFFFAOYSA-N 0.000 description 1
- 239000008199 coating composition Substances 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- UGKDIUIOSMUOAW-UHFFFAOYSA-N iron nickel Chemical compound [Fe].[Ni] UGKDIUIOSMUOAW-UHFFFAOYSA-N 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 239000004449 solid propellant Substances 0.000 description 1
- 239000002436 steel type Substances 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
- C22C33/06—Making ferrous alloys by melting using master alloys
-
- 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
- C22B1/02—Roasting processes
-
- 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)
- Organic Chemistry (AREA)
- Metallurgy (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Geochemistry & Mineralogy (AREA)
- Manufacturing & Machinery (AREA)
- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention discloses a low-energy-consumption low-carbon-emission low-cost production method of weathering steel, belonging to the field of weathering steel production, and the method comprises laterite-nickel ore powder sintering, converter smelting and refining, wherein: in the laterite-nickel ore powder sintering, sintering raw materials comprise 54-61% of laterite-nickel ore powder, 30-36% of magnetic separation steel slag powder, 4-6% of anthracite and 4-5% of quicklime powder, and laterite-nickel ore sintering ore is obtained through sintering; in the converter smelting, the laterite nickel sinter is added in the blowing process; in the refining, nickel plates are added according to the determination of the nickel component of the molten steel, and the weathering steel molten steel is obtained. Compared with the prior art have the characteristics of cost reduction and environmental protection.
Description
Technical Field
The invention relates to a production process of weathering steel, in particular to a method for producing weathering steel with low energy consumption, low carbon emission and low cost.
Background
The national standard component of the weathering steel (SPA-H) requires that the nickel is less than or equal to 0.65 percent, and the nickel of the weathering steel is controlled according to 0.09 to 0.13 percent when the weathering steel is produced by normal enterprises. The nickel element is added in the smelting process in the form of ferronickel (Ni: 8%) or nickel plate (Ni: 99%) alloy in the steelmaking process. The production of the nickel iron and the nickel plate both uses laterite-nickel ore as the main raw material, and because the nickel in the laterite-nickel ore powder is melted in the molten iron, which belongs to residual harmful elements for common steel types, the nickel pollutes the molten steel and affects the product quality, and the nickel cannot be used in batches, the laterite-nickel ore powder needs to be subjected to related smelting and electrolysis in the existing production process of the weather-resistant steel, and the process can be divided into a blast furnace (or blast furnace) smelting process and a rotary kiln-electric furnace reduction smelting process. The low-carbon economy is an economic development mode based on low energy consumption, low pollution and low emission, and the carbon dioxide emission in China is taken as a restrictive index and is brought into long-term planning in national economy and social development. The blast furnace smelting process has serious environmental pollution and high energy consumption, and is greatly limited in recent years. The production of ferronickel by reduction smelting in a rotary kiln-electric furnace, for example, in "an energy-saving smelting process for laterite-nickel ore" (CN 201410139935.8), firstly crushing ore to 50-150mm, calcining in a rotary kiln, producing calcine at 700 ℃, charging the calcine in an electric furnace, adding 10-30mm volatile coal, reducing and smelting at 1000 ℃ to produce crude ferronickel alloy, and converting to produce finished ferronickel alloy; and a method for extracting ferronickel alloy from laterite (CN 200710066019.6) comprises the following steps: drying and dehydrating laterite → mixing with 5-8% of coke powder at 800-1200 ℃, sintering and pre-reducing → smelting the mixed material (sintering material, lime, quartz and coke powder) in an electric furnace to obtain crude ferronickel alloy → putting into a ladle for molten iron desulphurization → a converter or an converting furnace to obtain refined ferronickel alloy, wherein the refined ferronickel alloy is used for putting into production of weathering resistant steel.
Laterite-nickel ore treated by the traditional method is refined into ferronickel alloy and then enters weather-resistant steel production, in order to simplify the process, enterprises try to simplify the process, for example, in the production process (CN 200810072455.9) for directly producing austenitic stainless steel by using laterite-nickel ore, laterite-nickel ore is sintered with coke powder and a flux, and then the sintered product and the coke are smelted in a blast furnace to obtain nickel-chromium-containing blast furnace molten iron, and then the molten iron enters a converter. For example, molten iron at 1400-1520 ℃ is prepared in the nickel-containing steel production process (CN 201510847301.2), nickel-containing minerals subjected to pre-reduction treatment (laterite-nickel ore and carbonaceous reducing agent are roasted at 550-750 ℃) are added, and the temperature is raised to 1400-1600 ℃. It can be seen that the above-mentioned techniques are all to add laterite-nickel sinter to the molten iron, and this process will result in an increase in the consumption of standard coal in this portion of the molten iron stage. All have the problems of large carbon emission and energy consumption. In addition, nickel is a harmful element for blast furnace molten iron, and the addition of molten iron in a blast furnace in the prior art has quantitative limitation, so that the utilization rate of laterite-nickel ore is limited.
Disclosure of Invention
The technical task of the invention is to provide a method for producing weathering steel with low energy consumption, low carbon emission and low cost aiming at the defects of the prior art, laterite-nickel ore powder is changed into laterite-nickel sinter ore to be directly used for producing weathering steel (SPA-H) in a converter, so that not only can precious alloy nickel in iron and steel materials and the laterite-nickel sinter ore be recovered to reduce the production and processing cost of the weathering steel, but also the carbon emission and energy consumption of the laterite-nickel ore powder in a blast furnace and nickel alloy production link can be reduced.
The technical scheme for solving the technical problem is as follows: a low-energy-consumption low-carbon-emission low-cost production method of weathering steel, the weathering steel contains 0.08-0.15% of nickel element, characterized in that: the method comprises the steps of laterite-nickel ore powder sintering, converter smelting and refining, wherein: in the laterite nickel ore powder sintering, sintering raw materials comprise 54-61% of laterite nickel ore powder, 30-36% of magnetic separation steel slag powder, 4-6% of anthracite and 4-5% of quicklime powder, and laterite nickel sintering ore is obtained through sintering; in the converter smelting, the laterite nickel sinter is added in the blowing process; in the refining, according to the determination of the nickel component of the molten steel, a nickel plate is added, and the molten steel of the weathering steel is obtained.
Furthermore, the nickel content in the laterite nickel ore powder is 0.9 +/-0.6%.
Furthermore, in the converter smelting, the dosage of each ton of steel of the laterite-nickel sinter is 60-70kg.
Further, molten steel containing 0.05 to 0.07% of nickel is obtained at the end point of the converter.
Furthermore, in the converter smelting, all the laterite nickel sinter is added in batches in the middle stage before blowing.
Further, in the converter smelting, 1/2 of the laterite-nickel sinter ore is gradually added after the blowing is started and before the slag charge is added, and the rest 1/2 of the laterite-nickel sinter ore is added within 2-3min after the slag charge is added.
Compared with the prior art, the invention has the following outstanding beneficial effects:
1. the process simplifies the production process flow of the weathering steel, and reduces the increase of equipment management and maintenance cost;
2. the laterite-nickel sinter replaces high-nickel iron to produce weathering steel, so that the use amount of nickel plates is reduced, and the direct reduction of the cost by 56.5 yuan/t can be realized;
3. compared with the prior art for refining ferronickel alloy, the process can reduce the consumption of standard coal by 29.1 ten thousand tons each year and reduce the emission of high-nickel iron carbon by 75.6 ten thousand tons; the laterite-nickel sinter is added in the molten steel link of the converter, so that the consumption of standard coal of the molten iron can be reduced by 8.4 ten thousand tons each year, and the carbon emission is reduced by 26.5 ten thousand tons; has the advantages of low energy consumption and low carbon emission.
Detailed Description
The present invention will be further described with reference to the following embodiments.
For the purposes of the following detailed description, it is to be understood that the invention may assume various alternative variations and step sequences, except where expressly specified to the contrary. Moreover, other than in any operating examples, or where otherwise indicated, all numbers expressing, for example, quantities of ingredients used in the specification and claims are to be understood as being modified in all instances by the term "about". At the very least, and not as an attempt to limit the application of the doctrine of equivalents to the scope of the claims, each numerical parameter should at least be construed in light of the number of reported significant digits and by applying ordinary rounding techniques.
Notwithstanding that the numerical ranges and parameters setting forth the broad scope of the invention are approximations, the numerical values set forth in the specific examples are reported as precisely as possible. Any numerical value, however, inherently contains certain errors necessarily resulting from the standard deviation found in their respective testing measurements.
It should also be understood that any numerical range recited herein is intended to include all sub-ranges subsumed therein. For example, a range of "1 to 10" is intended to include all sub-ranges between (and including) the recited minimum value of 1 and the recited maximum value of 10, that is, having a minimum value equal to or greater than 1 and a maximum value of equal to or less than 10.
In this application, the use of the singular includes the plural and plural encompasses singular, unless specifically stated otherwise. In addition, in this application, the use of "or" means "and/or" unless explicitly stated otherwise, even though "and/or" may be explicitly used in some instances. Further, in this application, the use of "a" or "an" means "at least one" unless specifically stated otherwise. For example, "a" first material, "a" coating composition, and the like refer to one or more of any of these items.
The invention relates to a method for producing weathering steel with low energy consumption, low carbon emission and low cost, which comprises the following steps: sintering the laterite-nickel ore powder, smelting in a converter, refining in an LF furnace, continuously casting to obtain a plate blank, and performing subsequent processes of continuous rolling, cooling and coiling.
The composition of the weathering steel contains 0.08-0.15% of nickel element, and the control target of the embodiment is 0.10-0.11%.
The method comprises the following specific steps:
s1, sintering laterite-nickel ore powder
(1) Mixing and granulating
Adding a mixture consisting of 54-61% of laterite nickel ore powder (the nickel content is 0.9 +/-0.6%), 30-36% of magnetic separation steel slag powder, 4-6% of anthracite and 4-5% of quicklime powder into a cylindrical mixer, and adding water according to 7-8% of the total weight of the mixture for uniformly mixing and granulating.
The added steel slag powder belongs to solid hazardous waste, and the process has the effect of treating the solid hazardous waste besides reducing the cost.
(2) Sintering of
Uniformly distributing the granulated mixture balls on a bed charge on a sintering pallet by using a distributor for sintering, wherein the ignition temperature is 1030-1130 ℃, the charge layer is 550-800mm, the mixture moisture is 19-19.5%, the pre-machine moisture is 9-9.5%, and the air draft pressure is negative pressure6 +/-1 kPa to negative pressure of 8 +/-1 kPa, flue temperature of 120-160 ℃, end point temperature of 350 +/-50 ℃, main draft fan opening of 60-70%, solid fuel consumption of 70-75kg/t and utilization coefficient of 0.54-0.94t/m 2 H, yield 67-75%. To ensure SO 2 And (4) standard emission, wherein the material layer and the end point temperature position are controlled to be relatively close to each other, modes such as overburning, cooling of the tail end of the sintering machine and the like are adopted, and meanwhile, the opening degree of an air door is controlled to ensure that the smoke emission reaches the standard.
(2) Crushing, cooling and screening
And carrying out thermal crushing treatment on the obtained sintered ore, cooling to room temperature, and screening by using a vibrating screen to obtain the laterite-nickel ore sintered ore with the granularity of more than 5mm and the proportion of more than or equal to 95%.
S2, smelting in a converter
Adding the laterite-nickel sinter obtained in the step S1 in the blowing process, wherein the dosage of each ton of steel is 60-70kg, and finally obtaining molten steel containing 0.05-0.07% of nickel.
The specific adding time is that all the laterite-nickel sinter ore is added in batches in the middle stage before blowing, in the embodiment, 1/2 of the laterite-nickel sinter ore is gradually added before adding slag after blowing is started, and the rest 1/2 of the laterite-nickel sinter ore is added within 2-3min after adding the slag.
Because nickel element is harmful element for the blast furnace, and the strength of the laterite-nickel sinter ore can not meet the use requirement of the blast furnace, the use of a large amount of laterite-nickel sinter ore causes poor air permeability of the blast furnace due to low strength, and normal production can not be maintained. However, the addition of the additive in the converter smelting process is liable to disturb the melting of the slag and the balance of the process temperature. If the laterite-nickel sinter is added into the molten iron too early before the blowing begins, the temperature in the converter is low, the slag reaction in the early stage of the blowing is violent, and the splashing is serious, so that the utilization rate of the laterite-nickel sinter in the converter is low; however, if the addition is too late, the laterite-nickel sinter lacks reaction time in the later stage of blowing, resulting in a great reduction in yield. Therefore, the process avoids the process defects by setting the composition and adding time of the sintered ore, promotes the recovery of nickel in the laterite-nickel ore, promotes the melting of slag and the balance of process temperature, and can ensure that the dosage of 60-70kg of steel per ton (equivalent to 33-43kg of original laterite-nickel ore powder) does not interfere with the smelting process of the converter.
S3, refining
And finally, refining the molten steel for the second time in a refining furnace, and supplementing nickel plates (adding 4-5kg of nickel plates per ton of steel) according to the determination of the nickel component of the molten steel to obtain qualified weather-resistant steel (Ni: 0.10-0.11%).
And S4, continuous casting and rolling, cooling and curling.
To better compare the process of the present application with the prior art, comparative tests were performed.
In the processes of each embodiment group and the comparison group, except that the use proportion of the laterite nickel ore powder and the adding process and time are different, the parameters of other process steps are the same or similar.
1. The composition of the sintering mixed materials of each group is as follows:
each group of laterite-nickel ore adopts the same batch of raw materials (nickel content is 0.9%), and finally the usage amount of laterite-nickel sinter ore is converted into 40kg of original laterite-nickel ore powder.
The sintered compositions of the various example sets are shown in the following table:
the sintered compositions of controls 1-2 were the same, as specified in the following table:
| laterite-nickel ore powder (%) | Anthracite dust (%) | Quicklime powder (%) | Joining zones | |
| Control group 1 | 88.1 | 9.3 | 2.6 | Converter, before the start of converting |
| Control group 2 | 88.1 | 9.3 | 2.6 | Blast furnace |
2. Each set of sintering parameters:
| ignition temperature C | Flue temperature C | End point temperature (. Degree.C.) | Sintering time min | |
| Example 1 | 1030 | 140±20 | 350±50 | 180 |
| Example 2 | 1070 | 140±10 | 350±50 | 150 |
| Example 3 | 1130 | 130±10 | 350±50 | 120 |
| Control group 1-2 | 1100 | 140±10 | 350±50 | 240 |
3. The addition condition of each group of sintered ores is as follows:
in each embodiment group, the adding time is that the materials are added in a converter smelting process in a plurality of times after blowing begins;
the reference group 1 is added after the molten iron in the converter is added and before the blowing is started;
control 2 was added to the blast furnace.
The total usage amount of each group of laterite-nickel sintering ores is converted into 40kg of original laterite-nickel ore powder, and nickel plates are replenished in the refining stage according to sampling measurement, so that the final nickel content is ensured to reach 0.1-0.11%.
4. The molten steel for continuous casting obtained from each group had the following composition and energy consumption comparisons:
the nickel content at the end point of the converter in each embodiment group can reach 0.05-0.07%, the utilization rate of the laterite nickel sinter ore is high, the amount of the nickel plate added is low, the cost is obviously reduced, and the carbon emission is low.
The laterite-nickel sinter produced by the control group 1 has low alkalinity and no other mineral powder to be mixed and sintered, so that the finished product powder is serious, the utilization rate of the laterite-nickel sinter is low in the process of adding the converter, the yield of the laterite-nickel sinter is further reduced due to the addition of the laterite-nickel sinter before blowing, the amount of nickel plates to be added is large, and the carbon emission in the process of preparing the nickel plates is high, so that the effects of saving energy and reducing cost are poor.
In the comparison group 2, laterite-nickel sinter ore converted from 40kg of original laterite-nickel ore powder is added into the blast furnace according to the original plan, but in the actual operation process, when the laterite-nickel ore powder is added in batches, only one fifth of the original plan amount is added, the blast furnace permeability index is abnormal, the reason may be that the laterite-nickel sinter ore in the comparison group 2 is low in strength, the blast furnace permeability is influenced, normal production cannot be maintained when the laterite-nickel sinter ore with the same amount of laterite-nickel ore powder is added into the blast furnace in a full amount, production stop accidents are caused, and therefore the laterite-nickel sinter ore is not added continuously, and the experiment fails.
Compared with the existing production process of weathering steel, the method for producing weathering steel by using laterite-nickel ore sinter ore has the advantages of simple process flow, low energy consumption, low cost and low carbon emission, can effectively solve the problems of complex process flow, high energy consumption, high cost and high carbon emission of the existing weathering steel production process, is beneficial to simplifying the production flow of weathering steel, reduces the problems of increased equipment management and maintenance cost, and opens up a new way for the production process of weathering steel.
While the invention has been described in detail and with reference to specific embodiments thereof, it will be apparent to one skilled in the art that various changes in the invention can be made therein without departing from the spirit and scope thereof.
Claims (6)
1. A low-energy-consumption low-carbon-emission low-cost production method of weathering steel, the weathering steel contains 0.08-0.15% of nickel element, characterized in that: the method comprises the steps of laterite-nickel ore powder sintering, converter smelting and refining, wherein:
in the laterite nickel ore powder sintering, sintering raw materials comprise 54-61% of laterite nickel ore powder, 30-36% of magnetic separation steel slag powder, 4-6% of anthracite and 4-5% of quicklime powder, and laterite nickel sintering ore is obtained through sintering;
in the converter smelting, the laterite nickel sinter is added in the blowing process;
in the refining, according to the determination of the nickel component of the molten steel, a nickel plate is added, and the molten steel of the weathering steel is obtained.
2. The method for producing weathering steel with low energy consumption, low carbon emission and low cost according to claim 1, characterized in that: the nickel content in the laterite-nickel ore powder is 0.9 +/-0.6%.
3. The method for producing weathering steel with low energy consumption, low carbon emission and low cost according to claim 2, characterized in that: in the converter smelting, the dosage of each ton of steel of the laterite-nickel sinter ore is 60-70kg.
4. The method for producing weathering steel with low energy consumption, low carbon emission and low cost according to claim 3, characterized in that: molten steel containing 0.05-0.07% of nickel is obtained at the end point of the converter.
5. The method for producing weathering steel with low energy consumption, low carbon emission and low cost according to claim 1, characterized by: in the converter smelting, all the laterite nickel sinter ore is added in batches in the middle stage before blowing.
6. The method for producing weathering steel with low energy consumption, low carbon emission and low cost according to claim 5, characterized by: in the converter smelting, 1/2 of laterite-nickel sinter ore is gradually added before slag charge is added after blowing begins, and the rest 1/2 of laterite-nickel sinter ore is added within 2-3min after the slag charge is added.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211210261.7A CN115354214A (en) | 2022-09-30 | 2022-09-30 | Method for producing weathering steel with low energy consumption, low carbon emission and low cost |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211210261.7A CN115354214A (en) | 2022-09-30 | 2022-09-30 | Method for producing weathering steel with low energy consumption, low carbon emission and low cost |
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| CN115354214A true CN115354214A (en) | 2022-11-18 |
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| CN202211210261.7A Pending CN115354214A (en) | 2022-09-30 | 2022-09-30 | Method for producing weathering steel with low energy consumption, low carbon emission and low cost |
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Application publication date: 20221118 |