CN111809045A - Cold pressing block for converter and preparation method thereof - Google Patents
Cold pressing block for converter and preparation method thereof Download PDFInfo
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- CN111809045A CN111809045A CN202010622128.7A CN202010622128A CN111809045A CN 111809045 A CN111809045 A CN 111809045A CN 202010622128 A CN202010622128 A CN 202010622128A CN 111809045 A CN111809045 A CN 111809045A
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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
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/242—Binding; Briquetting ; Granulating with binders
Abstract
The invention provides a cold pressing block for a converter and a preparation method thereof. The cold-pressing block for the converter consists of OG mud, metalized pellet undersize powder and a binder, wherein the weight ratio of the OG mud to the metalized pellet undersize powder is 70-90: 10-30, wherein the ratio of the weight of the binder to the sum of the weight of the OG mud and the weight of the metalized pellet undersize powder is 2-2.5%, the particle size of the OG mud is 0-5 mu m, and the particle size of the metalized pellet undersize powder is 0.02-5 mm. The particle size of the metallized pellet undersize powder is obviously larger than that of OG mud, the metallized pellet undersize powder with a larger particle size structure can provide framework materials for the cold-pressed block for the converter, the primary strength of the cold-pressed block for the converter can be increased under the condition of smaller binder dosage, and the material return rate of the cold-pressed block for the converter in the machining process is reduced.
Description
Technical Field
The invention belongs to the field of comprehensive utilization of iron-containing high-zinc solid waste resources, and particularly relates to a cold pressing block for a converter and a preparation method thereof.
Background
Converter OG mud is a product of converter wet dust removal, and the undersize powder of the metallized pellets is an undersize product of the metallized pellets produced by a rotary hearth furnace after being screened by a millimeter-grade screen, and is a material containing iron and high zinc. The iron content of the converter OG mud is 40-50%, and the iron content of the metallized pellet undersize powder is 53-63%. The OG mud also contains a certain amount of calcium oxide and silicon dioxide, the content of the calcium oxide is 10-12%, the content of the silicon dioxide is 0.8-1%, and the two materials have high values in terms of components and can be recycled.
The prior OG mud and metallized pellet undersize powder treatment method comprises the following steps: firstly, the zinc is returned to an iron-making area for use, and finally, the zinc is used as blast furnace burden, so that the zinc load of the blast furnace can be increased, in the blast furnace, along with the rise of coal gas, the temperature is reduced, the zinc steam is condensed into fine particles or oxidized into zinc oxide, and the zinc oxide is adhered or deposited in the pores of the burden, so that the air permeability of a material layer is deteriorated, the coal gas is prevented from passing through, even the suspension occurs, and the normal production of the blast furnace is influenced. If zinc vapor is deposited on brick lining gaps or wall surfaces on the upper part of the blast furnace, the volume expansion of the zinc vapor can cause nodulation or damage a furnace lining after the zinc vapor is oxidized, thereby changing the air flow distribution in the blast furnace and influencing the service life of the blast furnace. Secondly, the rotary hearth furnace is returned for treatment, the yield of the rotary hearth furnace is low, the energy consumption is high, and the production cost is high. And the risk of environmental protection is high due to the fact that the factory entrusts and processes.
Since the above-mentioned methods all have various problems, the method of treating a steel-making product such as OG sludge is a hot spot of recent research. Patent CN106544456A discloses the use of cold pressed blocks for blast furnace granulated slag medium iron production converter; patent CN103555936A discloses the use of quartz sand, manganese ore powder, dust removed from steel-making converter, and binder to prepare cold pressed blocks for steel-making; patent CN101671756A discloses that OG mud, dust removal powder, iron scale and other waste gas materials in the steel-making industry are used as main raw materials to prepare the composite slagging agent for the converter. It can be seen that OG mud is used for preparing cold-pressed blocks, which is beneficial to slagging and is an advanced treatment method, but the high material return rate of the cold-pressed blocks is an important factor for restricting the technical development, and patent CN108004394A improves the initial strength of the cold-pressed blocks by adding the binder in batches for three times, so as to improve the balling rate and reduce the generation of dust, but the addition amount of the binder in the scheme is large, which increases the energy consumption of a converter and increases the risk of introducing other impurities; and a special adding mode is required, and the operation is complex.
Therefore, the development of an environment-friendly cold-pressing block for the converter, which has low material return rate and less addition of a binder, is urgently needed.
Disclosure of Invention
The invention aims to provide a cold-pressing block for a converter, which has high primary strength, low material return rate and low binder consumption, aiming at the defects of high material return rate and large binder consumption caused by low primary strength of the cold-pressing block prepared from the existing steelmaking dust removal product. The cold-pressing block for the converter consists of OG mud, metalized pellet undersize powder and a binder, wherein the particle size of the metalized pellet undersize powder is obviously larger than that of the OG mud, the metalized pellet undersize powder with a larger particle size structure can provide framework materials for the cold-pressing block for the converter, the primary strength of the cold-pressing block for the converter can be increased under the condition of smaller binder consumption, and the material return rate of the cold-pressing block for the converter in the processing process is reduced.
The invention also aims to provide a preparation method of the cold-pressed block for the converter.
In order to achieve the purpose, the invention adopts the following technical scheme:
a cold-pressed block for a converter consists of OG mud, metallized pellet undersize powder and a binder; the weight ratio of the OG mud to the metallized pellet undersize powder is 70-90: 10-30%, wherein the ratio of the weight of the binder to the sum of the weight of the OG mud and the weight of the undersize powder of the metallized pellets is 2-2.5%; the grain size of the OG mud is 0-5 mu m, and the grain size of the metallized pellet undersize powder is 0.02-5 mm.
OG mud is a product of converter wet dedusting, has a particle size of 0-5 mu m and belongs to a micron level; the iron content of the converter OG mud is 40-50%, and the OG mud also contains 10-12% of calcium oxide and 0.8-1% of silicon dioxide.
The undersize powder of the metallized pellets is an undersize product of the metallized pellets produced by a rotary hearth furnace after being sieved by a millimeter-grade screen, the particle size range of the undersize powder is generally 0.02-5 mm, the undersize powder is a high zinc product containing iron and 53-63%, the undersize powder also comprises MnO accounting for 0.5-1.2% of the weight of the undersize powder, S accounting for 0.08-0.3% of the weight of the undersize powder and ZnO accounting for 0.5-2.0% of the weight of the undersize powder.
The cold-pressed block for the converter, the OG mud and the iron in the metallized pellet undersize powder can oxidize the elemental iron in the steel slag into Fe2O3Promoting the converter to produce slag; the grain diameter of the metallized pellet undersize powder is obviously larger than that of OG mud, the metallized pellet undersize powder with a larger grain diameter structure can provide framework materials for the cold-pressed block for the converter, the primary strength of the cold-pressed block for the converter can be increased under the condition of smaller binder dosage, and the material return rate of the cold-pressed block for the converter in the processing process is reduced.
The method can realize secondary resource utilization of OG mud and the undersize powder of the metallized pellet, simultaneously replace part of the consumption of the iron ore of the converter, improve the economic benefit and realize cost reduction and efficiency improvement.
Preferably, in the cold-pressed block for the converter, the weight ratio of OG mud to the undersize powder of the metallized pellets is 80: 20, and the ratio of the weight of the binder to the sum of the weight of the OG mud and the weight of the undersize powder of the metallized pellets is 2%.
Preferably, the cold-pressed block for the converter comprises, by weight, 40-54% of TFe, 8-11% of CaO and 1.5-2.5% of SiO20.6-1% of MnO, 0-0.2% of S and 1-1.8% of ZnO; the others are inevitable impurity elements.
Preferably, the OG mud contains 40-50 wt% of iron, 10-12 wt% of CaO and 0.8-1 wt% of SiO2。
Preferably, the grain diameter of the OG mud is 1-5 μm.
Preferably, the metallized pellet undersize powder contains 53-63% by weight of iron, 0.5-1.2% by weight of MnO, 0.08-0.3% by weight of S and 0.5-2.0% by weight of ZnO.
Preferably, the particle size of the undersize powder of the metallized pellet is 0.02-3 mm.
Preferably, the single-ball compressive strength of the cold-pressed block for the converter is more than or equal to 2400N.
Preferably, the granularity of the cold-pressed block for the converter is 18-28 mm multiplied by 25-35 mm multiplied by 35-5 mm.
The preparation method of the cold pressing block for the converter comprises the following steps:
s1, naturally air-drying steel-making OG mud for 3-7 days, and then drying until the water content is less than or equal to 30% by weight;
s2, mixing the dried OG mud, the metallized pellet undersize powder, the binder and water in the S1 to obtain a mixed material;
and S3, performing ball pressing, screening and drying on the mixed material obtained in the S2 to obtain the cold pressing block for the converter.
Preferably, step s2. the binder is a starch binder.
The preparation method of the invention has simple process and is convenient for large-scale production.
In the step S2, the addition of water influences the viscosity of the binder, and the water content of the mixed material needs to be controlled for processing. Preferably, in the step S2, the content of water in the mixed material accounts for 9-12% of the total weight.
Preferably, in step s3, the ball pressing is performed at a pressure of 350t by using a ball press.
Preferably, in the step s3, the screening standard is that the cold-pressed blocks are qualified when the granularity is larger than or equal to 18mm × 25mm × 35mm, the cold-pressed blocks are unqualified when the granularity is smaller than 18mm × 25mm × 35mm, the qualified cold-pressed blocks are conveyed to a green ball dryer through a conveyer belt for drying, and the unqualified cold-pressed blocks are conveyed to a powerful mixer for preparation from s2.
And S3, drying until the moisture content of the cold pressing block for the converter reaches below 2% by weight. Preferably, the drying temperature is 300-350 ℃, and the drying time is 35 min.
Compared with the prior art, the invention has the following beneficial effects:
the cold-pressed block for the converter, the OG mud and the iron in the metallized pellet undersize powder can oxidize the elemental iron in the steel slag into Fe2O3Promoting the converter to produce slag; the grain diameter of the metallized pellet undersize powder is obviously larger than that of OG mud, the metallized pellet undersize powder with a larger grain diameter structure can provide framework materials for a cold-pressed block for a converter, and the framework materials can be prepared under the condition of smaller binder dosageAnd the primary strength of the cold-pressed block for the converter is increased, and the material return rate of the cold-pressed block for the converter in the machining process is reduced.
The method can realize secondary resource utilization of OG mud and the undersize powder of the metallized pellet, simultaneously replace part of the consumption of the iron ore of the converter, improve the economic benefit and realize cost reduction and efficiency improvement.
The preparation process is simple and convenient for large-scale production.
Drawings
FIG. 1 is a flow chart of the preparation process of the cold pressing block for the converter.
Detailed Description
The present invention is further illustrated by the following specific examples, which are not intended to limit the invention in any way. Reagents, methods and apparatus used in the present invention are conventional in the art unless otherwise indicated. Unless otherwise indicated, reagents and materials used in the present invention are commercially available. The percentages and ratios referred to in the following examples are by weight unless otherwise specified.
The preparation of the following examples, as in figure 1, comprises the following steps:
s1, naturally air-drying steel-making OG mud for 3-7 days, and then drying until the water content is less than or equal to 30% by weight;
s2, mixing the dried OG mud, the metallized pellet undersize powder, the binder and water in the S1 to obtain a mixed material;
and S3, performing ball pressing, screening and drying on the mixed material obtained in the S2 to obtain the cold pressing block for the converter.
In the step S2, the addition of water can affect the viscosity of the binder, and for convenience of processing, the content of water in the mixed material needs to be controlled to be about 6% of the total weight of the mixed material.
The method for measuring the ball return rate in each example and comparative example is as follows:
respectively weighing the feeding weight of OG mud, metalized pellet undersize powder, water and a binder, and further calculating the total feeding amount; in the production process, the cold-pressed block passes through a fixed sieve, and undersize materials are weighed and used as the return material quantity. The ball pressing material return rate is equal to the material return amount/the total material feeding amount and is 100 percent.
Examples 1 to 4 and comparative examples 1 to 2
Examples and comparative examples cold briquettes for converters were prepared according to the formulations shown in table 1.
The particle size of the undersize powder of the metallized pellets in each embodiment is 0.02-3 mm; the grain diameter of the OG mud is 1-5 μm.
Table 1 examples and comparative examples each cold briquetting recipe (parts by weight) for a converter and performance tests
Among them, in comparative example 2, the metallized pellet with a large particle size had too much undersize, resulting in no molding.
The chemical composition, the drop strength, and the single-ball compressive strength of the cold-pressed blocks for the converter prepared in examples 1 to 4 and comparative example 1 were analyzed, and the results are shown in table 3.
1) Chemical component analysis: measuring by adopting an ICP spectrometer;
2) drop strength: dropping for 4 times from 1.5 m height, and measuring the content of particles less than or equal to 5 mm;
3) single ball compressive strength: the test is carried out by adopting an HXQT-10 iron ore pellet pressure tester.
Wherein, the index requirements of the cold pressing block for the converter are shown in the table 2:
TABLE 2 Cold briquetting specification for converter
TABLE 3 Cold briquetting specification for converter (%)
As can be seen from tables 2 and 3, the quality of the produced cold-pressed blocks meets the production standard requirements.
As can be seen from tables 1 and 3, the cold-pressed blocks for the converter provided by the embodiments of the invention have lower ball pressing and material returning rates compared with the comparative examples; moreover, from the examples 1-2, it can be seen that, under the condition of the same binder usage amount, the content of undersize powder of the metallized pellets is increased, the pellet return rate in the cold-pressed block preparation process is reduced, and the single pellet falling strength is increased, wherein the primary strength of the cold-pressed block is related to the pellet return rate, the higher the primary strength of the cold-pressed block is, the small particle loss on the cold-pressed block and the crushing rate of the cold-pressed block are small in the conveying process, and correspondingly, in the screening process, the proportion of qualified cold-pressed blocks is increased, and the return rate is reduced; when the addition amount of the undersize powder of the metallized pellets is larger (examples 1 and 2), the return rate of the pressed pellets in the preparation process of the cold-pressed block is greatly reduced (by at least 30%) compared with that of the cold-pressed block without the addition (comparative example 1).
In examples 4 and 5, it can be seen that, as the content of the undersize powder of the metallized pellet increases, the return rate of the pressed pellet in the preparation process of the cold-pressed block tends to increase, because the undersize powder of the metallized pellet basically has no viscosity, and under a proper addition amount, the return rate of the pressed pellet can be reduced by providing a skeleton material for the cold-pressed block, so that the primary strength of the cold-pressed block is improved; the addition amount is increased, which is not favorable for the formation of cold-pressed blocks. Therefore, in comparative example 2, the addition amount of the undersize powder of the metallized pellets was too large, so that it was impossible to prepare a formed cold briquette for a converter.
It can be seen from examples 2 and 3 that the same effect of pellet pressing material returning rate can be achieved with the increase of the addition amount of the undersize powder of the metallized pellet under the condition of reducing the using amount of the binder.
The cold-pressed blocks for the converter of 200 tons are produced in Zhanjiang steel tests in large scale according to the formula in example 2, and the cold-pressed blocks for the converter prepared by adding 0.5-2 tons per furnace are added according to actual smelting conditions during the converter, so that the service condition is good.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A cold-pressed block for a converter is characterized by consisting of OG mud, metallized pellet undersize powder and a binder; the weight ratio of the OG mud to the metallized pellet undersize powder is 70-90: 10-30%, wherein the ratio of the weight of the binder to the sum of the weight of the OG mud and the weight of the undersize powder of the metallized pellets is 2-2.5%; the grain size of the OG mud is 0-5 mu m, and the grain size of the metallized pellet undersize powder is 0.02-5 mm.
2. The cold block for the converter according to claim 1, wherein the weight ratio of OG sludge to under-sieve powder of the metallized pellets is 80: 20, and the ratio of the weight of the binder to the sum of the weight of the OG mud and the weight of the undersize powder of the metallized pellets is 2%.
3. The cold pressed block for the converter according to claim 1, wherein the cold pressed block for the converter comprises TFe 40-54 wt%, CaO 8-11 wt%, and SiO 1.5-2.5 wt%20.6-1% of MnO, 0-0.2% of S and 1-1.8% of ZnO.
4. The cold pressed block for a converter according to claim 1, wherein said OG sludge comprises 40-50 wt% of iron, 10-12 wt% of CaO, 0.8-1 wt% of SiO2。
5. The cold briquetting of claim 1, wherein said metallized pellet undersize comprises 53-63% by weight iron, 0.5-1.2% by weight MnO, 0.08-0.3% by weight S, 0.5-2.0% by weight ZnO.
6. The cold block for the converter according to claim 1, wherein the particle size of the metallized pellet undersize is 0.02-3 mm.
7. The cold press block for a converter of claim 1, wherein said binder is a starch binder.
8. The cold briquetting for a converter of claim 1, wherein said cold briquetting for a converter has a single ball compressive strength of 2400N or more.
9. The method for preparing the cold pressing block for the converter of any one of claims 1 to 8 is characterized by comprising the following steps:
s1, naturally air-drying steel-making OG mud for 3-7 days, and then drying until the water content is less than or equal to 30% by weight;
s2, mixing the dried OG mud, the metallized pellet undersize powder, the binder and water in the S1 to obtain a mixed material;
and S3, performing ball pressing, screening and drying on the mixed material obtained in the S2 to obtain the cold pressing block for the converter.
10. The preparation method of the cold pressing block for the converter according to claim 9, wherein in the step S2, the water content in the mixed material accounts for 9-12% of the total weight.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112280973A (en) * | 2020-11-02 | 2021-01-29 | 宝钢湛江钢铁有限公司 | Method for co-processing emulsified oil sludge by sintering system |
| CN112280975A (en) * | 2020-11-04 | 2021-01-29 | 韶关市曲江盛大冶金渣环保科技开发有限公司 | Method and device for pressing powder balls under screen of rotary hearth furnace |
| CN113736952A (en) * | 2021-08-31 | 2021-12-03 | 广东韶钢松山股份有限公司 | Steel-making warming agent and preparation method thereof |
| CN113981216A (en) * | 2021-10-21 | 2022-01-28 | 广东华欣环保科技有限公司 | Method for treating undersize powder of metallized pellet of rotary hearth furnace |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113981216A (en) * | 2021-10-21 | 2022-01-28 | 广东华欣环保科技有限公司 | Method for treating undersize powder of metallized pellet of rotary hearth furnace |
| CN113981216B (en) * | 2021-10-21 | 2023-02-28 | 广东华欣环保科技有限公司 | Treatment method of undersize powder of metallized pellet of rotary hearth furnace |
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