KR101610712B1 - manufacturing method of slag coagulant for cast iron and slag coagulant thereby - Google Patents

manufacturing method of slag coagulant for cast iron and slag coagulant thereby Download PDF

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KR101610712B1
KR101610712B1 KR1020150135794A KR20150135794A KR101610712B1 KR 101610712 B1 KR101610712 B1 KR 101610712B1 KR 1020150135794 A KR1020150135794 A KR 1020150135794A KR 20150135794 A KR20150135794 A KR 20150135794A KR 101610712 B1 KR101610712 B1 KR 101610712B1
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South Korea
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weight
parts
slag
mixed composition
perlite
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KR1020150135794A
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Korean (ko)
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김한엽
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주식회사 호동케미칼
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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
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B33/00—Clay-wares
    • C04B33/32—Burning methods
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C1/00—Refining of pig-iron; Cast iron
    • C21C1/04—Removing impurities other than carbon, phosphorus or sulfur
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C1/00—Refining of pig-iron; Cast iron
    • C21C1/08—Manufacture of cast-iron
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/0087—Treatment of slags covering the steel bath, e.g. for separating slag from the molten metal
    • 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
    • C22B1/005—Preliminary treatment of scrap
    • 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
    • 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
    • C22B1/243—Binding; Briquetting ; Granulating with binders inorganic
    • 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
    • C22B1/26—Cooling of roasted, sintered, or agglomerated ores

Abstract

The present invention relates to a method to produce a slag coagulant for cast iron, and the slag coagulant produced by the same. The method to produce the slag coagulant for cast iron comprises: a step of grinding perlite and albite at a constant size; a step of producing a mixture by mixing 40-60 wt% of perlite, 20-60 wt% of albite with respect to 100 wt% of the entire mixture; a step of adjusting a crystallized water content by thermally treating using a rotary kiln process; a step of cooling the mixture thermally treated; and a step of sorting the cooled mixture according to size and packaging the sorted mixture. By the same, the present invention obtains an effect of providing the slag coagulant with excellent recovery rate by lowering a melting temperature, and the crystallized water content by mixing and thermally treating perlite and albite.

Description

Technical Field The present invention relates to a slag coagulant for cast iron and a slag coagulant for slag coagulant,

The present invention relates to a process for producing a slag coagulant for cast iron and a slag coagulant prepared thereby, which comprises mixing a perlite and an ornamental stone and performing a heat treatment to lower the melting temperature and the crystal water content to obtain a slag coagulant for cast iron And a slag flocculant produced thereby.

In a steel mill or a general casting production process, slag is a by-product accompanied by an essential raw material or may be generated from the raw ore, and impurities such as oxidation of the molten metal, removal of the mold material, and molten metal may be generated by melting.

If foreign substances such as slag are mixed into the final molten steel, casting defects are caused. Therefore, it is possible to prevent mixing of foreign substances or to effectively remove slag generated by foreign substances.

Generally, in a casting production process, it is highly likely that foreign matters are almost always incorporated, and therefore, it is desirable to efficiently remove generated slag.

As a technique for removing such slag, there has been used a method of disposing a filter made of a refractory material such as ceramics into a sprue, a bath, a gate and the like to remove foreign matter mixed in the molten metal.

However, when a filter is used, it is effective for removing large foreign matter. However, not only removal of small foreign matter is not properly performed but also it is not easy to dispose the filter separately in the bath system.

As described above, there is a slag removing method using a slag flocculant in addition to a method of removing slag by a filter.

When slag flocculant is applied to a molten metal, it expands to make it porous and agglomerates slag. It is easy to agglomerate slag with good flow and good fluidity, and it is possible to remove slag by putting slag flocculant into molten metal without installing any equipment And it is conveniently used because it is easy to remove slag together with slag flocculant.

As a conventional slag flocculant, perlite is widely used. It is known that perlite is basically containing about 3 ~ 5% of crystals. In order to control the content of crystalline water, first heat treatment and second heat treatment are carried out to adjust the crystal water content and porosity to obtain final slag flocculant .

However, since the slag coagulant using such perlite has a high melting temperature, it is required to increase the temperature of the molten metal to be used as a slag coagulant and has a disadvantage in that the coefficient of expansion is low and the coagulation efficiency is low due to high crystalline water content.

Korean Patent Application Publication No. 1999-0050238.

Disclosure of Invention Technical Problem [8] Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and an object of the present invention is to provide a slag coagulant for cast iron which is excellent in slag recovery rate by mixing perlite and calcareous stone and performing heat treatment to lower the melting temperature and crystalline water content, For the purpose of providing.

In order to attain the above object, the present invention provides a method for producing a granular composition, comprising the steps of: crushing a granite and a tunic stone to a predetermined size; mixing 40 to 60 parts by weight of the perlite and 20 to 60 parts by weight of the tunic stone, A step of heating the mixed composition by a rotary kiln apparatus to adjust a content of crystalline water, a step of cooling the mixed composition after the heat treatment, and a step of selecting the cooled mixed composition by size And a slag coagulant for cast iron produced by the method. The present invention relates to a slag coagulant for cast iron, and a method for manufacturing the same.

It is preferable that the perlite is crushed to 0.3 to 2.5 mm and the crushed stone is crushed to 0.3 to 0.7 mm.

The heat treatment may be performed at a temperature of 600 to 700 ° C for 30 to 1 hour and the heat treatment may be performed by injecting the mixed composition between the main combustion chamber of the rotary kiln apparatus and an additional combustion chamber formed outside the rotary kiln, And indirect heat of the main combustion chamber of the rotary kiln apparatus.

The slag flocculant preferably has a specific gravity of 0.7 to 0.8, a crystalline water content of 0.9 to 1.2% and a porosity of 40 to 45%.

The present invention provides a slag coagulant for cast iron which comprises a mixture of perlite and talcum at an appropriate ratio and is heat treated to lower the crystalline water content so that the slag aggregate can be swollen well when placed in a molten metal, It has excellent effect.

In addition, by using a mixed composition comprising a mixture of perlite and talc, it is possible to lower the melting temperature and easily apply the slag as a slag flocculant for removing slag for cast iron.

1 is a block diagram of a method for producing a slag coagulant for cast iron according to the present invention.

The present invention relates to a process for producing a slag coagulant for cast iron and a slag coagulant prepared thereby, which comprises mixing a perlite and an ornamental stone and performing a heat treatment to lower the melting temperature and the crystal water content to obtain a slag coagulant for cast iron And a slag flocculant produced thereby.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. 1 is a block diagram of a method for producing a slag coagulant for cast iron according to the present invention.

As shown in the drawing, the method for producing a slag coagulant for cast iron according to the present invention comprises the steps of crushing the perlite and the calcined stone to a predetermined size, and blending 40 to 60 parts by weight of the perlite, To 45 parts by weight of a mixed composition to prepare a mixed composition; subjecting the mixed composition to a heat treatment by a rotary kiln apparatus to adjust a content of crystalline water; cooling the mixed composition after the heat treatment; And a step of sorting and packing the completed mixed composition by size.

Perlite used in the present invention is a kind of pearlite mineral. Perlite is a vitreous rock formed by rapid cooling of lava generated by volcanic activity, and contains about 3 to 5% of crystal water. It is usually gray or bluish, but sometimes it is brown, blue or red. When such a perlite is charged into the molten metal, it expands and cools the slag. The chemical composition of the perlite according to the present invention is shown in Table 1 below.

SiO 2 Al 2 O 3 Fe 2 O 3 CaO MgO Na 2 O K 2 O Content (wt%) 74.5 15.3 0.9 0.1 1.0 1.5 5.0

In the case of the perlite rock according to the present invention comprising the above-mentioned composition, the specific gravity of the slag flocculating agent is larger than the specific gravity of the slag, which facilitates penetration (agglomeration of the slag) and is excellent in flocculation effect and can be applied to the change in viscosity due to the basicity of the slag There are advantages.

The albite (NaAlSi 3 O 8) is known to have excellent crystalline material is calculated as the adsorption effect of the fine particles, and a white glossy glass as the main component sodium. In addition, it has a low melting temperature (1100 ~ 1200 ℃), but even when it is heated up to 1400 ℃, there is no change in the molten state, so it is injected into molten metal and is effective for slag removal and generally has a specific gravity of 2.6 ~ 2.7. The chemical composition of the goethite according to the present invention is shown in Table 2 below.

SiO 2 Al 2 O 3 Na 2 O K 2 O MgO CaO Fe 2 O 3 TiO 2 Content (wt%) 74.87 13.21 4.10 2.34 0.30 1.87 0.59 0.07

These peridotite and calcareous stone are crushed to a certain size. The size of the crushed stone is 0.3 ~ 2.5mm, the crushed stone is 0.3 ~ 0.7mm and the crushed stone is crushed to a size smaller than the size of peridotite. The porosity of the mixed composition made of stones is minimized to improve the workability and enable efficient transportation and storage.

The mixture is then mixed with 40 to 60 parts by weight of the perene and 20 to 60 parts by weight of the calcined stone per 100 parts by weight of the total composition.

It is possible to control the content of crystalline water in the entire mixed composition by controlling the amount of the crystalline mixture mixed with perlite in the composition, and to control the porosity and the melting temperature, and the content range of the composition is selected according to the type of the molten metal and slag .

The melting temperature of the slag flocculant can be lowered by mixing the slag stones and the slag flocculant can be easily used without difficulty in consideration of the melting temperature.

If necessary, an inorganic binder such as water glass may be added to the above composition in an amount of 10 to 20 parts by weight based on the total weight of the composition. When the inorganic binder is mixed with the binder, The shape of the finished product is shaped and supplied in a specific form such as a circle or a rectangle to facilitate transportation, storage and management, and it is easy to put a predetermined amount into the molten metal.

Then, the mixed composition is put into a rotary kiln apparatus and heat treatment is performed to adjust the content of crystalline water in the mixed composition.

The slag coagulant prepared by the heat treatment according to the present invention has a specific gravity of 0.7 to 0.8, a crystalline water content of 0.9 to 1.2% and a porosity of 40 to 40% To 45%.

If the content of the crystal water is too high or low, the expansion does not occur properly when the crystal water is added to the molten metal. If the porosity increases, the crystal water content decreases and the expansion does not proceed properly.

In order to control the porosity of the perlite, conventionally, the secondary heat treatment (1200 ° C) has been performed by controlling the crystal number of the inside of the primary heat treatment by 2 to 3%. However, the mixed composition according to the present invention is put into a rotary kiln And a single heat treatment may be performed.

On the other hand, in order to control the porosity and lower the melting temperature, it is possible to form voids by lowering the melting point of calcium silicate, sodium silicate, potassium silicate or water, sulfur dioxide, carbon dioxide, nitrogen, silica, It is possible to add a substance. It is preferable to add about 10 to 20 parts by weight of the material for such pore rule control to the entire composition.

Here, the heat treatment is performed at a temperature of 600 to 700 ° C for 30 to 1 hour, and the mixed composition is injected into a main combustion chamber of the rotary kiln apparatus and an additional combustion chamber formed on the outer side thereof, The indirect heat of the main combustion chamber of FIG.

That is, in the conventional rotary kiln apparatus, most of the heat is discharged to the atmosphere by using a dust collector in order to maintain a low atmospheric temperature. The waste heat is provided to an additional combustion chamber outside the main combustion chamber, The heat treatment according to the present invention is performed by using the waste heat of the rotary kiln device without any additional energy source.

The temperature and time for the heat treatment are adjusted to control the crystal water content and to control the porosity and specific gravity by adjusting the specific gravity of 0.7 to 0.8, the crystal water content of 0.9 to 1.2% and the porosity of 40 to 45% Heat treatment temperature and time.

After the heat treatment is completed, the mixed composition is introduced into a storage tank that communicates with the space between the main combustion chamber and the additional combustion chamber of the rotary kiln apparatus, and is cooled by a water-cooling method for a predetermined period of time. The mixed composition is then introduced into a separator through an elevator, , The slag coagulant according to the present invention is completed by being packed selectively by size using a 0.3 to 0.7 mm sieve.

The slag coagulant prepared in this way was mixed with perlite and ore sand at an appropriate ratio and heat treatment was performed to lower the crystal water content so that the slag was recovered when the slag was poured into the molten metal so that the slag recovery rate was excellent. And can be easily applied to a slag flocculant for slag removal.

Claims (7)

Grinding the perlite and the calcined stone to a predetermined size;
Preparing a mixed composition by mixing 40 to 60 parts by weight of the perene and 20 to 60 parts by weight of goethite per 100 parts by weight of the total composition;
Subjecting the mixed composition to a heat treatment by a rotary kiln apparatus to adjust a crystalline water content;
Cooling the heat-treated mixed composition; And
And sorting and packing the cooled mixed composition by size,
The heat-
Wherein the mixed composition is introduced between a main combustion chamber of the rotary kiln apparatus and an additional combustion chamber formed outside the main combustion chamber and is formed by an indirect heat of the main combustion chamber of the rotary kiln apparatus,
The perlite is, SiO 2 to 74.5wt%, Al 2 O 3 15.3wt %, Fe 2 O 3 0.9wt%, CaO 0.1wt%, MgO 1.0wt%, Na 2 O 1.5wt%, K 2 O 5.0wt% Including,
The mixed composition further includes an inorganic binder consisting of 10 to 20 parts by weight of water glass based on 100 parts by weight of the total mixed composition, wherein 10 to 20 parts by weight of a material for controlling porosity is added to 100 parts by weight of the mixed composition The method for producing a slag coagulant for cast iron according to claim 1, The method of claim 1, wherein the perlite is milled to 0.3 to 2.5 mm, and the calcined stone is milled to 0.3 to 0.7 mm. The method according to claim 1,
Wherein the slag coagulant is formed at a temperature of 600 to 700 占 폚 for 30 to 1 hour. delete The slag flocculant according to claim 1,
A specific gravity of 0.7 to 0.8, a crystalline water content of 0.9 to 1.2% and a porosity of 40 to 45%. A mixed composition consisting of 40 to 60 parts by weight of perennial and 35 to 45 parts by weight of goethite per 100 parts by weight of the total composition is injected into the main combustion chamber of the rotary kiln apparatus and the additional combustion chamber formed on the outer side thereof, The heat treatment is performed by the indirect heat of the combustion chamber,
The perlite is, SiO 2 to 74.5wt%, Al 2 O 3 15.3wt %, Fe 2 O 3 0.9wt%, CaO 0.1wt%, MgO 1.0wt%, Na 2 O 1.5wt%, K 2 O 5.0wt% , ≪ / RTI >
The mixed composition further includes an inorganic binder consisting of 10 to 20 parts by weight of water glass based on 100 parts by weight of the total mixed composition, wherein 10 to 20 parts by weight of a material for controlling porosity is added to 100 parts by weight of the mixed composition Wherein the content of the crystalline water is adjusted. 7. The method of claim 6,
A specific gravity of 0.7 to 0.8, a crystalline water content of 0.9 to 1.2% and a porosity of 40 to 45%.
KR1020150135794A 2015-09-24 2015-09-24 manufacturing method of slag coagulant for cast iron and slag coagulant thereby KR101610712B1 (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009028779A (en) 2007-06-27 2009-02-12 Masaharu Kobayashi Solidified slag coagulation agent
JP2009228043A (en) 2008-03-21 2009-10-08 Ube Ind Ltd Material and method for removing slag
JP5338096B2 (en) 2008-03-21 2013-11-13 宇部興産株式会社 Slag removing material and slag removing method

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009028779A (en) 2007-06-27 2009-02-12 Masaharu Kobayashi Solidified slag coagulation agent
JP2009228043A (en) 2008-03-21 2009-10-08 Ube Ind Ltd Material and method for removing slag
JP5338096B2 (en) 2008-03-21 2013-11-13 宇部興産株式会社 Slag removing material and slag removing method

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