CN112941311B - Preparation method of composite cold-pressed pellets for converter steelmaking - Google Patents
Preparation method of composite cold-pressed pellets for converter steelmaking Download PDFInfo
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- CN112941311B CN112941311B CN202110126273.0A CN202110126273A CN112941311B CN 112941311 B CN112941311 B CN 112941311B CN 202110126273 A CN202110126273 A CN 202110126273A CN 112941311 B CN112941311 B CN 112941311B
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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
- C22B1/248—Binding; Briquetting ; Granulating of metal scrap or alloys
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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
- C22B1/2406—Binding; Briquetting ; Granulating pelletizing
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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
- C22B1/243—Binding; Briquetting ; Granulating with binders inorganic
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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
- C22B1/244—Binding; Briquetting ; Granulating with binders organic
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Abstract
The invention belongs to the technical field of composite cold-pressed pellets. The technical scheme is as follows: uniformly mixing 5-15 parts by mass of steel rolling oil sludge, 5-15 parts by mass of steel making sludge and 2-8 parts by mass of organic acid, and standing for 20-60 min at 20-60 ℃ to obtain a primary mixed material; adding 15-25 parts by mass of iron scale, 15-30 parts by mass of blast furnace gas mud and 30-40 parts by mass of fly ash into the primary mixed material, and stirring to obtain a secondary mixed material; and then pressing and molding the secondary mixed material, and drying until the moisture content is less than 2wt% to obtain the composite cold-pressed pellet. The invention has the characteristics of simple process, low production cost, no special requirement on equipment and capability of reducing environmental pollution, and the prepared composite cold-pressed pellets for converter steelmaking have high compressive strength.
Description
Technical Field
The invention belongs to the technical field of composite cold-pressed pellets. In particular to a preparation method of composite cold-pressed pellets for converter steelmaking.
Background
Iron and steel enterprises can produce a large amount of various iron-containing dust and sludge in the production process, and the types of the iron-containing dust and sludge include various fly ash, blast furnace gas sludge, iron scale, steel-making sludge, steel-rolling sludge and the like. The iron-containing dust and sludge are complex in type, high in iron content and high in recycling value, at present, the main utilization mode of the iron-containing dust and sludge is to coarsely return to sintering, but the excessive addition of the iron-containing dust and sludge can reduce the quality of sintered ores and damage sintering equipment. Especially the steel rolling oil sludge and the steel making sludge have huge output and bad smell and are difficult to treat. At present, the processing methods commonly used by iron and steel enterprises comprise an incineration method, a pyrolysis method and the like, but the treatment process has the risk of secondary pollution, and the mechanical separation method and the solvent extraction method have the problems of small treatment amount and incapability of large-scale application. This causes the problems of large amount of solid wastes in the factory, land occupation and environmental pollution.
The patent technology of 'a method for preparing iron ore sintered pellet binder by using steel oily sludge and binder and application thereof' (CN 110699543A) provides a method for preparing iron ore sintered pellet binder by using steel oily sludge, iron ore sintered pellet binder is prepared by performing multi-stage solid-liquid separation on the steel oily sludge and adding an oxidant for catalytic oxidation treatment, and then the iron ore sintered pellet binder is used for pelletizing and granulating sintered pellets of iron ore concentrate. The technology solves the problem of recycling the oily sludge by a method for preparing the binder by catalytic oxidation of the steel oily sludge, but the process is complex, has high requirements on equipment and has high production cost.
The patent technology of (CN 104726699B) discloses a method for producing composite metallized pellet by using metallurgical iron-containing dust and mud, wherein the core of pellet is prepared from metallurgical iron-containing dust and mud such as blast furnace gas dust, converter OG mud and converter secondary dedusting ash, and the shell is prepared from iron ore concentrate and bentonite to obtain the composite metallized pellet. However, the process uses bentonite as a binder to mix iron ore concentrate to prepare the shell, the binder consumption is large, the performance index of the pellets is reduced, the preparation process is complex, and the cost is high.
A process for treating the iron-contained dust and mud in rotary hearth furnace (CN 107326128A) includes such steps as mixing iron-contained dust and mud, adhesive and powdered coal or carbon-contained dust, cold solidifying to become raw pellets, and reduction calcining in rotary hearth furnace. The process uses a large amount of binder in the process of producing the pellets, and the production cost is high.
In summary, except for direct return sintering, the existing recycling process of iron-containing dust and mud has the problems of great environmental pollution, high equipment requirement and high production cost caused by the addition of a large amount of binder.
Disclosure of Invention
The invention mainly solves the technical problem of providing the preparation method of the composite cold-pressed pellets for converter steelmaking, which has simple process, low production cost, no special requirement on equipment and can reduce environmental pollution.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
uniformly mixing 5-15 parts by mass of steel rolling oil sludge, 5-15 parts by mass of steelmaking sludge and 2-8 parts by mass of organic acid, and standing for 20-60 min at the temperature of 20-60 ℃ to obtain a primary mixed material.
And adding 15-25 parts by mass of iron scale, 15-30 parts by mass of blast furnace gas mud and 30-40 parts by mass of fly ash into the primary uniform mixture, and stirring to obtain a secondary uniform mixture.
And then pressing and molding the secondary mixed material, and drying until the moisture content is less than 2wt% to obtain the composite cold-pressed pellet.
The organic acid is one of acetic acid, oxalic acid and citric acid.
The steel rolling oil sludge is solid waste obtained by treating steel rolling oily wastewater by a chemical method in a cold rolling process and a hot rolling process of a steel rolling mill.
The steelmaking sludge is sludge obtained by wet dedusting of an oxygen top-blown converter.
The iron scale is iron-containing oxide generated on the surface of steel after a rolled piece is rapidly cooled in the rolling process of a steel rolling mill.
The blast furnace gas sludge is obtained by precipitation treatment after a wet dust removal system is adopted in the blast furnace ironmaking process.
The fly ash is gravity fly ash generated in the sintering, iron-making and steel-making processes.
Due to the adoption of the technical scheme, compared with the prior art, the invention has the beneficial effects that:
(1) According to the invention, the organic acid modified steel rolling oil sludge and steel making sludge replace binders to prepare the high-performance composite cold-pressed pellets, so that the steel rolling oil sludge and steel making sludge which are difficult to treat by steel enterprises can be recycled, the problems of large accumulation of the steel rolling oil sludge and the steel making sludge in a factory, land occupation and environmental pollution of the steel enterprises are solved, and the environmental pollution is reduced.
(2) According to the invention, the organic acid modified steel rolling oil sludge and the steelmaking sludge are used for replacing the binder to prepare the high-performance composite cold-pressed pellets, no other binder is required to be added, no special equipment is required, the cost for producing the composite cold-pressed pellets is reduced, and the prepared composite cold-pressed pellets for converter steelmaking have high compressive strength.
(3) The composite cold-pressed pellets are prepared by using the steel rolling oil sludge, the steel-making sludge, the iron scale, the blast furnace gas sludge and the dedusting ash, the raw materials are all solid wastes of steel enterprises, no iron ore concentrate is used, the ingredients are easy to obtain, the process is simple, and the expandability is strong.
Therefore, the invention has the characteristics of simple process, low production cost, no special requirement on equipment and capability of reducing environmental pollution, and the prepared composite cold-pressed pellets for converter steelmaking have high compressive strength.
Detailed Description
The present invention will be further described with reference to the following detailed description, which is not intended to limit the scope of the invention.
A preparation method of composite cold-pressed pellets for converter steelmaking. The preparation method of the specific embodiment comprises the following steps:
uniformly mixing 5-15 parts by mass of steel rolling oil sludge, 5-15 parts by mass of steel making sludge and 2-8 parts by mass of organic acid, and standing for 20-60 min at the temperature of 20-60 ℃ to obtain a primary mixed material.
And adding 15-25 parts by mass of iron scale, 15-30 parts by mass of blast furnace gas mud and 30-40 parts by mass of fly ash into the primary mixed material, and stirring to obtain a secondary mixed material.
And then pressing and molding the secondary mixed material, and drying until the moisture content is less than 2wt% to obtain the composite cold-pressed pellet.
The organic acid is one of acetic acid, oxalic acid and citric acid.
In the present embodiment, the following technical features are the same in each example:
the steel rolling oil sludge is solid waste obtained by treating steel rolling oily wastewater by a chemical method in the cold rolling and hot rolling processes of iron and steel enterprises;
the steelmaking sludge is sludge obtained by wet dedusting of an oxygen top-blown converter;
the iron scale is iron-containing oxide generated on the surface of steel after a rolled piece is rapidly cooled in the rolling process of a steel mill;
the blast furnace gas sludge is sludge obtained by precipitation treatment after a wet dust removal system is adopted in the blast furnace ironmaking process;
the dedusting ash is gravity dedusting ash generated in the sintering, iron making and steel making processes.
The detailed description is omitted in the embodiments.
Example 1
A preparation method of composite cold-pressed pellets for converter steelmaking. The preparation method of the embodiment is as follows:
uniformly mixing 8 parts by mass of steel rolling oil sludge, 5 parts by mass of steel making sludge and 2 parts by mass of organic acid, and standing for 60min at the temperature of 20 ℃ to obtain a primary mixed material.
And adding 15 parts by mass of iron scale, 30 parts by mass of blast furnace gas mud and 40 parts by mass of fly ash into the primary uniform mixture, and stirring to obtain a secondary uniform mixture.
And then pressing and molding the secondary mixed material, and drying until the moisture content is 1.2wt% to obtain the composite cold-pressed pellets for converter steelmaking.
The organic acid is acetic acid.
The composite cold-pressed pellets for converter steelmaking prepared in the embodiment have an average compressive strength of 950N through tests.
A comparative example was prepared in the same manner as in this example except that no organic acid was used. The average compressive strength of the prepared composite cold-pressed pellets is 635N.
Example 2
A preparation method of composite cold-pressed pellets for converter steelmaking. The preparation method of the embodiment is as follows:
uniformly mixing 5 parts by mass of steel rolling oil sludge, 15 parts by mass of steel making sludge and 8 parts by mass of organic acid, and standing for 40min at 40 ℃ to obtain a primary mixed material.
And adding 25 parts by mass of iron scale, 15 parts by mass of blast furnace gas mud and 32 parts by mass of fly ash into the primary uniform mixture, and stirring to obtain a secondary uniform mixture.
And then pressing and molding the secondary mixed material, and drying until the water content is 0.9wt% to obtain the composite cold-pressed pellets for converter steelmaking.
The organic acid is oxalic acid.
The composite cold-pressed pellet for converter steelmaking prepared in the embodiment has an average compressive strength of 1275N through tests.
A comparative example was prepared in the same manner as in this example except that no organic acid was used. The average compressive strength of the prepared composite cold-pressed pellets is 456N.
Example 3
A preparation method of composite cold-pressed pellets for converter steelmaking. The preparation method of the embodiment is as follows:
and uniformly mixing 15 parts by mass of steel rolling oil sludge, 7 parts by mass of steelmaking sludge and 5 parts by mass of organic acid, and standing for 20min at the temperature of 60 ℃ to obtain a primary mixed material.
And adding 20 parts by mass of iron scale, 23 parts by mass of blast furnace gas mud and 30 parts by mass of fly ash into the primary uniform mixture, and stirring to obtain a secondary uniform mixture.
And then pressing and molding the secondary mixed material, and drying until the water content is 0.8wt% to obtain the composite cold-pressed pellets for converter steelmaking.
The organic acid is citric acid.
The composite cold-pressed pellets for converter steelmaking prepared in the example have an average compressive strength of 1745N.
A comparative example was prepared in the same manner as in this example except that no organic acid was used. The average compressive strength of the prepared composite cold-pressed pellets is 542N.
Compared with the prior art, the beneficial effects of the specific implementation mode are as follows:
(1) According to the specific embodiment, the organic acid modified steel rolling oil sludge and the steel making sludge are used for replacing the binder to prepare the high-performance composite cold-pressed pellets, so that the steel rolling oil sludge and the steel making sludge which are difficult to treat by steel enterprises can be recycled, the problems that the steel rolling oil sludge and the steel making sludge of the steel enterprises are accumulated in a large amount in a factory, the land is occupied, the environment is polluted are solved, and the environmental pollution is reduced.
(2) According to the specific embodiment, the organic acid modified steel rolling oil sludge and steel making sludge are used for replacing the binder to prepare the high-performance composite cold-pressed pellet, the addition of other binders is not needed, special equipment is not needed, the cost for producing the composite cold-pressed pellet is reduced, and the prepared composite cold-pressed pellet for converter steel making is high in compressive strength.
(3) According to the specific embodiment, the composite cold-pressed pellets are prepared by using the steel rolling oil sludge, the steel making sludge, the iron scale, the blast furnace gas sludge and the dedusting ash, all raw materials are solid wastes of steel enterprises, no iron ore concentrate is used, the ingredients are easy to obtain, the process is simple, and the expandability is strong.
Therefore, the specific implementation mode has the characteristics of simple process, low production cost, no special requirement on equipment and capability of reducing environmental pollution, and the prepared composite cold-pressed pellets for converter steelmaking have high compressive strength.
Claims (7)
1. A preparation method of composite cold-pressed pellets for converter steelmaking is characterized by comprising the following steps:
uniformly mixing 5-15 parts by mass of steel rolling oil sludge, 5-15 parts by mass of steel making sludge and 2-8 parts by mass of organic acid, and standing for 20-60 min at 20-60 ℃ to obtain a primary mixed material;
adding 15-25 parts by mass of iron scale, 15-30 parts by mass of blast furnace gas mud and 30-40 parts by mass of fly ash into the primary uniform mixture, and stirring to obtain a secondary uniform mixture;
and then pressing and molding the secondary mixed material, and drying until the moisture content is less than 2wt% to obtain the composite cold-pressed pellets.
2. The method for preparing the composite cold-pressed pellets for converter steelmaking according to claim 1, wherein the organic acid is one of acetic acid, oxalic acid and citric acid.
3. The method for preparing the composite cold-pressed pellets for converter steelmaking according to claim 1, wherein the steel rolling oil sludge is solid waste obtained by treating oily wastewater of steel rolling by a chemical method in a cold rolling process and a hot rolling process of a steel rolling mill.
4. The method for preparing the composite cold-pressed pellets for converter steelmaking according to claim 1, wherein the steelmaking sludge is sludge obtained by wet dedusting of a basic oxygen furnace.
5. The method for preparing the composite cold-pressed pellets for converter steelmaking according to claim 1, wherein the iron scale is iron-containing oxide generated on the surface of steel after a rolled piece is cooled rapidly in the rolling process of a steel mill.
6. The method for preparing the composite cold-pressed pellets for converter steelmaking according to claim 1, wherein the blast furnace gas sludge is sludge obtained by precipitation treatment after a wet dust removal system is adopted in a blast furnace ironmaking process.
7. The method for preparing the composite cold-pressed pellets for converter steelmaking according to claim 1, wherein the fly ash is gravity fly ash generated in sintering, ironmaking and steelmaking processes.
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| CN202110126273.0A CN112941311B (en) | 2021-01-29 | 2021-01-29 | Preparation method of composite cold-pressed pellets for converter steelmaking |
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| CN112941311B true CN112941311B (en) | 2022-10-18 |
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| BR0301250A (en) * | 2003-05-05 | 2004-12-21 | Samarco Mineracao Sa | Iron ore pellets with reduced abrasion, bonding, degradation and dust emission, and their manufacturing process |
| CN101775489B (en) * | 2010-01-21 | 2011-12-07 | 同济大学 | Method for preparing cold-bonded pellets from iron containing sludge by compound adhesive |
| CN102912120B (en) * | 2012-10-23 | 2015-11-18 | 鞍钢股份有限公司 | Preparation method of high-strength cold-pressed pellets |
| CN106480309A (en) * | 2015-08-31 | 2017-03-08 | 鞍钢股份有限公司 | Dust and mud pellet for alkali metal removal treatment and preparation method thereof |
| CN105695735B (en) * | 2015-11-26 | 2019-04-26 | 北京璞域环保科技有限公司 | The autoreduction of a kind of steel rolling oily sludge and blast furnace dust utilizes technique |
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