CN106661475B - Composition for forming arc furnace steelmaking dust cake and arc furnace steelmaking dust cake - Google Patents

Composition for forming arc furnace steelmaking dust cake and arc furnace steelmaking dust cake Download PDF

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CN106661475B
CN106661475B CN201480080691.9A CN201480080691A CN106661475B CN 106661475 B CN106661475 B CN 106661475B CN 201480080691 A CN201480080691 A CN 201480080691A CN 106661475 B CN106661475 B CN 106661475B
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arc furnace
electric arc
furnace steelmaking
steelmaking dust
composition
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CN106661475A (en
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金台洪
崔洛运
金兑轩
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Lotte Fine Chemical Co Ltd
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Lotte Fine Chemical Co Ltd
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    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10LFUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
    • C10L5/00Solid fuels
    • C10L5/40Solid fuels essentially based on materials of non-mineral origin
    • C10L5/48Solid fuels essentially based on materials of non-mineral origin on industrial residues and waste materials

Abstract

The invention discloses a composition for forming an electric arc furnace steelmaking dust block and an electric arc furnace steelmaking dust block. The disclosed composition for forming an electric arc furnace steelmaking dust briquette includes electric arc furnace steelmaking dust and a cellulose ether compound having a viscosity of about 4,000cps to about 80,000cps as a binder.

Description

Composition for forming arc furnace steelmaking dust cake and arc furnace steelmaking dust cake
Technical Field
The present invention relates to a composition for forming an arc furnace steelmaking dust block and an arc furnace steelmaking dust block, and more particularly, to a composition for forming an arc furnace steelmaking dust block and an arc furnace steelmaking dust block containing a binder cellulose ether compound having a specific viscosity range.
Background
The iron manufacturing process is classified into: an iron making process of manufacturing molten iron by charging iron ore and/or iron pieces together with coal into a blast furnace, a steel making process of manufacturing high purity molten steel by removing impurities from molten iron, a casting process of manufacturing semi-finished products such as solid-phase slabs from liquid-phase molten steel, and a rolling process of manufacturing final steel products by processing semi-finished products such as slabs.
In the integrated iron and steel making process, molten iron is produced by using 90 to 100% by weight of iron ore and 0 to 10% by weight of reduced iron (scrap) or iron pieces as raw materials. In an electric arc furnace ironmaking process, molten iron is produced by using 90 to 95 wt% of iron pieces and 5 to 10 wt% of iron ore as raw materials.
In the electric arc furnace steelmaking process, 1.2 to 1.5 wt% of dust, i.e., electric arc furnace steelmaking dust (EAFD), is generated with respect to 100 wt% of a finished molten steel during melting of iron scrap and iron ore. These electric arc furnace steelmaking dusts have the highest iron content of 25 to 35% by weight, while the main recyclable materials, zinc and lead, have contents of 18 to 28% by weight and 2 to 5% by weight, respectively.
Various methods for recovering precious metals contained in steelmaking dust include various methods such as the Waelz method using a rotary kiln and the ZIA (zinc iron availability) method. Recently, a method of reducing and recovering precious metals contained in electric arc furnace steel making dust in a calciner after the electric arc furnace steel making dust is agglomerated has been developed. This process has been used commercially.
Electric arc furnace steelmaking dust is a very fine particle having an average particle size of about 1 μm, and a relatively large amount of binder is required for briquetting such a very fine particle. In addition, in order to form a block having high compressive strength, the briquetting process includes a drying process at a temperature of about 140 ℃ to about 150 ℃, when molasses is used as a main binder.
However, when molasses is used as the binder, the following disadvantages occur.
First, with the recent development of the bioethanol industry, molasses is facing short supply and consequent price increases.
Secondly, molasses also gives off malodours in the process.
Due to the heat applied in the drying process of the process of manufacturing the electric arc furnace steelmaking dust cake, latent heat accumulates in the electric arc furnace steelmaking dust cake, resulting first in the combustion of molasses and then in the combustion of coal used as a reducing agent, with the risk of fire occurring.
In addition, molasses has a viscous liquid form, and viscosity increases with decreasing temperature, and thus may adhere to tanks, pipes, and nozzles when stored, transported, and sprayed. To prevent these drawbacks, precautions and safeguards (e.g., high pressure pumps and heating systems) are needed. Therefore, when molasses is used as a binder, the process for manufacturing the arc furnace steelmaking dust block becomes complicated.
In addition, since molasses is derived from natural substances, the viscosity of molasses varies depending on its source, supplier and supply time point, thereby causing difficulty in stably maintaining the quality of the arc furnace steelmaking dust cake.
Furthermore, molasses is in liquid form and has a low density, so that a large amount of molasses and a large-capacity storage facility are required. Resulting in an increase in traffic volume and consequent transportation costs.
Disclosure of Invention
Technical problem
The present invention provides a composition for forming an electric arc furnace steelmaking dust block, said composition comprising a cellulose ether compound having a specific viscosity range as a binder.
The present invention provides an electric arc furnace steelmaking dust block formed from a composition for forming an electric arc furnace steelmaking dust block.
Technical scheme
According to one aspect of the invention, a composition for forming an electric arc furnace steelmaking dust block comprises: electric arc furnace steelmaking dust; and a cellulose ether compound having a viscosity of about 4,000cps to about 80,000cps as a binder.
The electric arc furnace steelmaking dust may have an average particle size of 0.3 μm to 1.0 μm.
The cellulose ether compound may not include carboxymethyl cellulose (CMC).
The cellulose ether compound may include at least one compound selected from the group consisting of Methylcellulose (MC), Hydroxyethylcellulose (HEC), Hydroxypropylcellulose (HPC), Hydroxypropylmethylcellulose (HPMC), Hydroxyethylmethylcellulose (HEMC), and Methylethylhydroxyethylcellulose (MEHEC).
The Methylcellulose (MC) may have a degree of methyl substitution of 18 to 32 wt.%, the Hydroxyethylcellulose (HEC) may have a degree of hydroxyethyl substitution of 20 to 80 wt.%, the Hydroxypropylcellulose (HPC) may have a degree of hydroxypropyl substitution of 20 to 80 wt.%, the Hydroxypropylmethylcellulose (HPMC) may have a degree of methyl substitution of 18 to 32 wt.% and a degree of hydroxypropyl substitution of 2 to 14 wt.%, and the Hydroxyethylmethylcellulose (HEMC) may have a degree of methyl substitution of 18 to 32 wt.% and a degree of hydroxyethyl substitution of 2 to 14 wt.%.
The amount of the cellulose ether compound may be 0.01 to 15.0 parts by weight with respect to 100 parts by weight of the electric arc furnace steel making dust.
The composition for forming the eaf dust cake may further include an additional binder in an amount of more than 0 to 15.0 parts by weight, relative to 100 parts by weight of the eaf dust.
The additional binder may include at least one compound selected from the group consisting of molasses, epoxy resin, glycerin, guar gum, gum arabic, lignosulfonate, nitrophenol, silicone, polyacrylamide, polyvinyl acetal, polyvinyl alcohol, starch, pregelatinized starch, starch ether, and wine (liquor).
The composition for forming the eaf dust cake may further include water in an amount of more than 0 to 10.0 parts by weight, relative to 100 parts by weight of the eaf dust.
The composition for forming the electric arc furnace steelmaking dust block may not include glycerin.
According to an aspect of the present invention, there is provided an electric arc furnace steelmaking dust block manufactured from a composition for forming an electric arc furnace steelmaking dust block according to any of the embodiments described above.
The electric arc furnace steelmaking dust cake may include the cellulose ether compound and may not include glycerol.
Effects of the invention
According to one or more embodiments, a composition for forming an electric arc furnace steelmaking dust cake includes a binder cellulose ether compound, which is colorless and odorless in a solid powder form and has a specific viscosity range, thus having no offensive odor and improving the working environment. Also, the total amount of binder used can be reduced (to one tenth of the amount of molasses when using 100%) and thus, the fire risk can be improved. And the process of manufacturing the steelmaking dust block for the electric arc furnace can be simplified. It is possible to manufacture a high-strength electric arc furnace steelmaking dust cake which can maintain a more stable supply and demand and a more stable price than molasses.
Detailed Description
Hereinafter, embodiments of the composition for forming an electric arc furnace steelmaking dust block will be described in detail.
According to one aspect of the invention, a composition for forming an electric arc furnace steelmaking dust block comprises: electric arc furnace steelmaking dust (EAFD); and a cellulose ether compound having a viscosity of 4,000 centipoise (cps) or mPa-s to about 80,000cps or mPa-s as an adhesive. As used herein, the term "electric arc furnace steelmaking dust" may refer to dust generated in a steelmaking process in an ironmaking process. As used herein, the term "viscosity of a cellulose ether compound" can refer to the viscosity of a 2 weight percent aqueous solution of a cellulose ether compound measured with a BrookfieldDV-II + Pro (spindle HA) at about 20. + -. 0.1 ℃.
When the viscosity of the cellulose ether compound is less than 4,000cps, the viscosity of a solution (e.g., an aqueous solution) containing the cellulose ether compound is too low, resulting in a decrease in binding ability of the cellulose ether compound to electric arc furnace steelmaking dust. When the viscosity of the cellulose ether compound is more than 80,000cps, the molecular weight of the cellulose ether compound is high, resulting in a decrease in water-solubility, failing to sufficiently exert binding ability to electric arc furnace steelmaking dust.
The viscosity of the cellulose ether compound may have, for example, a viscosity of 5,000cps to 70,000cps, 6,000cps to 60,000cps, 7,000cps to 50,000cps, 8,000cps to 40,000cps, 9,000cps to 30,000cps, a viscosity of 10,000cps to 20,000 cps.
The electric arc furnace steelmaking dust may have an average particle size of 0.3 μm to 1.0 μm.
The cellulose ether compound can bind the particles of electric arc furnace steelmaking dust to each other.
The cellulose ether compound is not only well dissolved in water but also does not deposit on the inner surface of the nozzle when sprayed through the nozzle in an aqueous solution state, and thus does not clog the nozzle. And the cellulose ether compound is stored and transported in the form of solid powder alone or mixed with electric arc furnace steelmaking dust, and mixed with water at the end use stage, so that it is possible to simplify storage facilities and to simplify transportation facilities. Even if a smaller amount than molasses is used, the cellulose ether compound can obtain the same adhesive effect as molasses, not only the risk of fire is small, but also the unit price is lower than molasses, and thus the material cost can be reduced. Furthermore, cellulose ether compounds will be more stable than molasses in terms of supply and demand and price.
The cellulose ether compound may not include carboxymethyl cellulose (CMC). When the cellulose ether compound comprises carboxymethylcellulose (CMC), the strength of the eaf dust cake produced from the composition used to form the eaf dust cake may be reduced.
The cellulose ether compound may include at least one compound selected from the group consisting of Methylcellulose (MC), Hydroxyethylcellulose (HEC), Hydroxypropylcellulose (HPC), Hydroxypropylmethylcellulose (HPMC), Hydroxyethylmethylcellulose (HEMC), and Methylethylhydroxyethylcellulose (MEHEC).
The Methylcellulose (MC) may have a degree of methyl substitution of 18 to 32 wt.%, the Hydroxyethylcellulose (HEC) may have a degree of hydroxyethyl substitution of 20 to 80 wt.%, the Hydroxypropylcellulose (HPC) may have a degree of hydroxypropyl substitution of 20 to 80 wt.%, the Hydroxypropylmethylcellulose (HPMC) may have a degree of methyl substitution of 18 to 32 wt.% and a degree of hydroxypropyl substitution of 2 to 14 wt.%, and the Hydroxyethylmethylcellulose (HEMC) may have a degree of methyl substitution of 18 to 32 wt.% and a degree of hydroxyethyl substitution of 2 to 14 wt.%.
The amount of the cellulose ether compound may be 0.01 to 15.0 parts by weight with respect to 100 parts by weight of the electric arc furnace steel making dust. When the amount of the cellulose ether compound is within this range, a high strength of the nugget of the electric arc furnace steelmaking dust can also be obtained using a smaller amount than the molasses.
The composition for forming the eaf dust cake may further include an additional binder in an amount of more than 0 to 15.0 parts by weight, relative to 100 parts by weight of the eaf dust. When the amount of the additional binder is within this range, the amount of the cellulose ether compound used may be reduced, thereby reducing the preparation cost of the composition for forming the arc furnace dust cake and increasing the drying rate of the composition for forming the arc furnace dust cake.
The additional binder may include at least one compound selected from the group consisting of molasses, epoxy resin, glycerin, guar gum, gum arabic, lignosulfonate, nitrophenol, silicone, polyacrylamide, polyvinyl acetal, polyvinyl alcohol, starch, pregelatinized starch, starch ether, and wine (liquor).
The composition for forming the eaf dust cake may further include water in an amount of more than 0 to 10.0 parts by weight, relative to 100 parts by weight of the eaf dust. When the amount of water is within this range, a composition which is easy to handle and has a uniform composition can be obtained, and some components in the composition can be prevented from adhering to the surface of a molding machine in the block-forming process.
The composition for forming the electric arc furnace steelmaking dust block may not include glycerin. When the composition for forming an arc furnace steelmaking dust block includes glycerin, the drying rate of the arc furnace steelmaking dust block prepared from the composition may be slowed down, resulting in a decrease in thermal efficiency.
According to another aspect of the present invention, there is provided an electric arc furnace steelmaking dust block formed from the composition for forming an electric arc furnace steelmaking dust block according to any one of the embodiments described above.
A method of making an electric arc furnace steelmaking dust block from a composition for forming an electric arc furnace steelmaking dust block according to any of the embodiments described above is as follows. The method may include placing the composition for forming an electric arc furnace steelmaking dust block into a mold, pressurizing the mold at a predetermined pressure, and drying the resulting pressed product, thereby forming an electric arc furnace steelmaking dust block.
The electric arc furnace steelmaking dust cake may include the cellulose ether compound and may not include glycerol.
The present invention will now be described in further detail with reference to the following examples. These examples do not limit the invention.
[ examples ]
Examples 1 to 9 and comparative examples 1 and 2
(preparation of a composition for Forming an electric arc furnace steelmaking dust Block)
Arc furnace steelmaking dust (average particle size: 0.3 μm), hydroxypropyl methylcellulose and optionally molasses (KCIE co., ltd., solid content: 77.2 wt%, total sugar content: 49.3 wt%) obtained from korea a company having an arc furnace steelmaking process as furniture were mixed and a first composition was obtained. Then, distilled water is added to the first composition, thereby obtaining a composition for forming an electric arc furnace steelmaking dust lump. The contents of the ingredients in each composition of examples 1 to 9 and comparative examples 1 and 2 are shown in table 1.
(manufacture of arc furnace steelmaking dust brick)
Each of the prepared compositions for forming the steelwork dust blocks was compression-formed with a briquetting machine (available from JEIL MACHINERY co., ltd., JCB250T) under a load of about 205 bar to produce fifty steelwork dust blocks, followed by selection of thirty steelwork dust blocks in addition to the first ten and the last twenty blocks. The selected electric arc furnace steelmaking dust blocks were dried in an oven at about 145 c for about 3 hours. The weight of each electric arc furnace steelmaking dust block is 10-20 g.
Comparative example 3
(preparation of a composition for Forming an electric arc furnace steelmaking dust Block)
Except that carboxymethyl cellulose (CMC) (available from Ashiland, Aqualon) was usedTMViscosity: 6,000cps) instead of hydroxypropylmethylcellulose (HPMC1), a composition for forming an electric arc furnace steelmaking dust block was prepared in the same manner as in example 1. The contents of the ingredients in the composition of comparative example 3 are shown in table 1.
Comparative example 4
(preparation of a composition for Forming an electric arc furnace steelmaking dust Block)
An electric arc furnace steelmaking dust (average particle size: 0.3 μm) obtained from a company having an electric steelmaking process in korea and molasses (KCIE co., ltd., solid content: 77.2 wt%, total sugar content: 49.3 wt%) were mixed and a first composition was obtained. Then, distilled water is added to the first composition, thereby obtaining a composition for forming an electric arc furnace steelmaking dust lump. The contents of the ingredients in the composition of comparative example 4 are shown in table 1.
(manufacture of arc furnace steelmaking dust brick)
An electric arc furnace steelmaking dust block was manufactured in the same manner as in examples 1 to 9 and comparative examples 1 and 2, except that the composition for forming an electric arc furnace steelmaking dust block of comparative example 4 was used instead of the composition for forming an electric arc furnace steelmaking dust block prepared in examples 1 to 9 and comparative examples 1 and 2. The weight of each electric arc furnace steelmaking dust block is 10-20 g.
[ TABLE 1 ]
Figure BDA0001211723330000071
Figure BDA0001211723330000081
Figure BDA0001211723330000091
HPMC 1: samsung Fine Chemicals Co., Ltd (Samsung Fine Chemicals Co., Ltd.),
Figure BDA0001211723330000092
HPMC (PMC-60U), viscosity: 60,000cps, degree of methyl substitution: 23.2 wt%, degree of hydroxypropyl substitution: 8.8% by weight
HPMC 2: a precision chemical corporation of three stars,
Figure BDA0001211723330000093
HPMC (PMC-40H), viscosity: 4,000cps, degree of methyl substitution: 28.6 wt%, hydroxypropyl degree of substitution: 6.1% by weight
HPMC 3: samsung precision chemical co, HPMC, viscosity: 80,000cps, degree of methyl substitution: 22.8 wt%, degree of hydroxypropyl substitution: 9.1% by weight
HPMC 4: samsung precision chemical co, HPMC, viscosity: 3,000cps, degree of methyl substitution: 26.4 wt%, degree of hydroxypropyl substitution: 8.2% by weight
HPMC 5: samsung precision chemical co, HPMC, viscosity: 85,000cps, degree of methyl substitution: 22.6 wt%, degree of hydroxypropyl substitution: 9.2% by weight
Evaluation examples
Evaluation example 1
The crushing strength and the compressive strength of the electric arc furnace steelmaking dust blocks manufactured in examples 1 to 9 and comparative examples 1 to 4 were evaluated by the following methods. The results are shown in table 2.
(evaluation of crushing Strength)
After twenty of the arc furnace steelmaking dust blocks manufactured in each example were dropped ten times at a height of 165cm, the total weight of the residual pieces having a size of 5 μm or more of the arc furnace steelmaking dust blocks was expressed as a weight percentage with respect to the total weight of the arc furnace steelmaking dust blocks of the respective examples before dropping. The obtained value of weight percent was regarded as crushing strength. The higher weight percentage values obtained mean that the electric arc furnace steelmaking dust cake has a higher crushing strength. This crush strength is a benchmark for determining the percent loss of several drops as the arc furnace steelmaking dust cake is transported through the conveyor.
(evaluation of compressive Strength)
The maximum strength of the steelmaking dust cake in the electric arc furnace was measured and recorded as the compressive strength when compressed with a general material tester (SHINGPRECISION CO., LTD., AD-general material tester-kN) at a rate of 5 μm/min. This compressive strength is a reference for estimating the rate of damage caused by the weight of the electric arc furnace steelmaking dust cake when it is stored in the storage tank.
[ TABLE 2 ]
Figure BDA0001211723330000101
Referring to table 2, it can be found that: the electric-arc furnace steelmaking dust blocks manufactured in examples 1 to 9 had higher crushing strength and higher compression strength than the electric-arc furnace steelmaking dust blocks manufactured according to comparative examples 1 to 4.
While the invention has been described with reference to exemplary embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof. Therefore, the true technical scope of the present invention needs to be determined according to the technical idea of the claims.

Claims (6)

1. A composition for forming an electric arc furnace steelmaking dust block, consisting of:
electric arc furnace steelmaking dust;
a cellulose ether compound having a viscosity of 4,000cps to 80,000cps as a binder;
an additional binder; and
the amount of water is controlled by the amount of water,
wherein the cellulose ether compound comprises at least one compound selected from the group consisting of Methylcellulose (MC), Hydroxyethylcellulose (HEC), Hydroxypropylcellulose (HPC), Hydroxypropylmethylcellulose (HPMC), Hydroxyethylmethylcellulose (HEMC), and Methylethylhydroxyethylcellulose (MEHEC),
wherein the cellulose ether compound does not comprise carboxymethyl cellulose (CMC),
wherein the additional binder is selected from the group consisting of molasses, epoxy resins, glycerin, guar gum, gum arabic, lignosulfonates, nitrophenols, silicones, polyacrylamides, polyvinyl acetals, polyvinyl alcohols, starches, pregelatinized starches, and starch ethers,
wherein the cellulose ether compound is in an amount of 0.01 to 15.0 parts by weight relative to 100 parts by weight of the electric arc furnace steelmaking dust,
wherein the additional binder is in an amount of greater than 0 to 15.0 parts by weight relative to 100 parts by weight of the electric arc furnace steelmaking dust,
wherein the amount of the water is more than 0 to 10.0 parts by weight with respect to 100 parts by weight of the electric arc furnace steelmaking dust.
2. The composition for forming a dust mass for electric arc furnace steelmaking of claim 1, wherein the electric arc furnace steelmaking dust has an average particle size of 0.3 to 1.0 μ ι η.
3. The composition for forming an electric arc furnace steelmaking dust block of claim 1, wherein the Methylcellulose (MC) has a degree of methyl substitution of 18 to 32 wt.%, the Hydroxyethylcellulose (HEC) has a degree of hydroxyethyl substitution of 20 to 80 wt.%, the Hydroxypropylcellulose (HPC) has a degree of hydroxypropyl substitution of 20 to 80 wt.%, the Hydroxypropylmethylcellulose (HPMC) has a degree of methyl substitution of 18 to 32 wt.% and a degree of hydroxypropyl substitution of 2 to 14 wt.%, and the Hydroxyethylmethylcellulose (HEMC) has a degree of methyl substitution of 18 to 32 wt.% and a degree of hydroxyethyl substitution of 2 to 14 wt.%.
4. The composition for forming an electric arc furnace steelmaking dust block of claim 1, wherein the composition for forming an electric arc furnace steelmaking dust block does not include glycerin.
5. An electric arc furnace steelmaking dust block manufactured from the composition for forming an electric arc furnace steelmaking dust block according to any one of claims 1 to 4.
6. The EAF steelmaking dust block of claim 5, wherein the EAF dust block comprises a cellulose ether compound and does not include glycerin.
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