CN112941311B - A kind of preparation method of composite cold-pressed pellets for converter steelmaking - Google Patents

A kind of preparation method of composite cold-pressed pellets for converter steelmaking Download PDF

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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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CN112941311A (en
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张一敏
鲁永胜
蔡震雷
刘涛
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Wuhan University of Science and Technology WHUST
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    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22BPRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B1/00Preliminary treatment of ores or scrap
    • C22B1/14Agglomerating; Briquetting; Binding; Granulating
    • C22B1/24Binding; Briquetting ; Granulating
    • C22B1/248Binding; Briquetting ; Granulating of metal scrap or alloys
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22BPRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B1/00Preliminary treatment of ores or scrap
    • C22B1/14Agglomerating; Briquetting; Binding; Granulating
    • C22B1/24Binding; Briquetting ; Granulating
    • C22B1/2406Binding; Briquetting ; Granulating pelletizing
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22BPRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B1/00Preliminary treatment of ores or scrap
    • C22B1/14Agglomerating; Briquetting; Binding; Granulating
    • C22B1/24Binding; Briquetting ; Granulating
    • C22B1/242Binding; Briquetting ; Granulating with binders
    • C22B1/243Binding; Briquetting ; Granulating with binders inorganic
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22BPRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B1/00Preliminary treatment of ores or scrap
    • C22B1/14Agglomerating; Briquetting; Binding; Granulating
    • C22B1/24Binding; Briquetting ; Granulating
    • C22B1/242Binding; Briquetting ; Granulating with binders
    • C22B1/244Binding; Briquetting ; Granulating with binders organic
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00Technologies related to metal processing
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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

一种转炉炼钢用复合冷压球团的制备方法A kind of preparation method of composite cold-pressed pellets for converter steelmaking

技术领域technical field

本发明属于复合冷压球团技术领域。特别是涉及一种转炉炼钢用复合冷压球团的制备方法。The invention belongs to the technical field of composite cold-pressed pellets. In particular, it relates to a preparation method of composite cold-pressed pellets for converter steelmaking.

背景技术Background technique

钢铁企业在生产过程中会产生大量的各类含铁尘泥,种类包括各种除尘灰、高炉瓦斯泥、氧化铁皮、炼钢污泥和轧钢油泥等。这些含铁尘泥种类复杂,含铁量较高,具有一定的回收利用价值,目前,这类含铁尘泥的主要利用方式是粗放式返回烧结,但是这些含铁尘泥的过量添加会降低烧结矿质量、损坏烧结设备。尤其是轧钢油泥和炼钢污泥,其产量巨大,伴有恶臭,难以处理。目前钢铁企业普遍使用的处理方法有焚烧法、热解法等,但在处理过程中会有二次污染的风险,机械分离法和溶剂萃取法又存在处理量小,无法大规模应用的问题。这就造成了这类固废在厂内大量堆积,占用土地,污染环境的问题。In the production process of iron and steel enterprises, a large amount of various types of iron-containing dust sludge will be produced, including various dust removal dust, blast furnace gas sludge, iron oxide scale, steelmaking sludge and steel rolling sludge. These iron-containing dust sludges are complex in type and high in iron content, and have a certain recycling value. At present, the main utilization method of this type of iron-containing dust and sludge is extensive return sintering, but the excessive addition of these iron-containing dust sludge will reduce the Quality of sinter and damage to sinter equipment. In particular, steel rolling sludge and steelmaking sludge have a huge output and are accompanied by foul odors, which are difficult to handle. At present, the commonly used treatment methods in iron and steel enterprises include incineration, pyrolysis, etc., but there is a risk of secondary pollution during the treatment process. Mechanical separation and solvent extraction methods have the problem of small treatment capacity and cannot be applied on a large scale. This has resulted in the accumulation of such solid wastes in factories, occupying land and polluting the environment.

“一种利用钢铁含油污泥制备铁矿烧结球团粘结剂的方法及粘结剂和应用”(CN110699543 A)专利技术,提出了一种利用钢铁含油污泥制备铁矿烧结球团粘结剂的方法,通过将钢铁含油污泥进行多级固液分离和添加氧化剂催化氧化处理制备铁矿烧结球团粘结剂,然后用于铁精矿的烧结球团的造球制粒过程。该技术通过将钢铁含油污泥催化氧化制备粘结剂的方法来解决含油污泥的回收利用问题,但是该工艺较为复杂,对设备要求较高,生产成本高。"A method, binder and application of iron ore sintered pellets prepared by using steel oily sludge" (CN110699543 A) patented technology, which proposes a method for preparing iron ore sintered pellets using iron and steel oily sludge to bond The method is to prepare the iron ore sintered pellet binder by carrying out multi-stage solid-liquid separation of oily steel sludge and adding oxidant for catalytic oxidation treatment, and then used in the sintering pelletizing process of iron ore concentrate. This technology solves the problem of recycling oily sludge by catalyzing the oxidation of iron and steel oily sludge to prepare a binder, but the process is relatively complex, requires high equipment and high production costs.

“利用冶金含铁尘泥生产的高强度复合金属化球团及其生产工艺”(CN 104726699B)专利技术,提出了一种利用冶金含铁尘泥生产复合金属化球团及其生产工艺的方法,通过高炉瓦斯灰、转炉OG泥、转炉二次除尘灰这些冶金含铁尘泥制备球团内核,使用铁精矿和膨润土制作外壳,制得复合金属化球团。但是该工艺使用了膨润土作粘结剂混合铁精矿来制备外壳,粘结剂用量大,降低了球团的性能指标,制备过程复杂、成本较高。"High-strength composite metallized pellets produced by using metallurgical iron-containing dust and sludge and its production process" (CN 104726699B) patent technology, which proposes a method for producing composite metallized pellets by using metallurgical iron-containing dust and sludge and its production process , the core of pellets is prepared by metallurgical iron-containing dust sludge such as blast furnace gas ash, converter OG sludge, and converter secondary dust ash, and iron concentrate and bentonite are used to make outer shell to obtain composite metallized pellets. However, in this process, bentonite is used as a binder and mixed with iron ore to prepare the shell, and the amount of the binder is large, which reduces the performance index of the pellets, and the preparation process is complicated and the cost is high.

“一种含铁尘泥转底炉处理工艺”(CN 107326128 A)专利技术,提出了一种将含铁尘泥、粘结剂与煤粉或含碳除尘灰配料后混合均匀,冷固结成生球团,之后进入转底炉还原焙烧。该工艺在生产球团的过程中使用了大量的粘结剂,生产成本高。The patented technology of "a rotary hearth furnace treatment process for iron-containing dust and sludge" (CN 107326128 A) proposes a method of mixing iron-containing dust and sludge, a binder and coal powder or carbon-containing dust dust evenly, and then cold-solidified The pellets are formed, and then enter the rotary hearth furnace for reduction and roasting. This process uses a large amount of binder in the process of producing pellets, and the production cost is high.

综上所述,目前含铁尘泥的回收利用工艺除直接返回烧结外,其余工艺存在环境污染大、设备要求高和粘结剂的大量配加导致生产成本高的问题。To sum up, the current recycling process of iron-containing dust and sludge, except for the direct return to sintering, has the problems of large environmental pollution, high equipment requirements and high production cost due to the large amount of binder.

发明内容SUMMARY OF THE INVENTION

本发明主要解决的技术问题是提供一种工艺简单、生产成本低、对设备无特殊要求和能降低环境污染的转炉炼钢用复合冷压球团的制备方法,使用该方法制备的转炉炼钢用复合冷压球团抗压强度高。The main technical problem to be solved by the present invention is to provide a method for preparing composite cold-pressed pellets for converter steelmaking, which is simple in process, low in production cost, has no special requirements for equipment and can reduce environmental pollution. The compressive strength of composite cold-pressed pellets is high.

为解决上述技术问题,本发明所采取的技术方案是:In order to solve the above-mentioned technical problems, the technical scheme adopted by the present invention is:

将5~15质量份的轧钢油泥、5~15质量份的炼钢污泥和2~8质量份的有机酸混匀,在20~60℃条件下静置20~60min,得到一次混匀料。Mix 5-15 parts by mass of steel sludge, 5-15 parts by mass of steel-making sludge and 2-8 parts by mass of organic acid, and let stand for 20-60 minutes at 20-60°C to obtain a primary mixing material .

再将15~25质量份的氧化铁皮,15~30质量份的高炉瓦斯泥和30~40质量份的除尘灰加入所述一次混匀料,搅拌,得到二次混匀料。Then, 15-25 parts by mass of iron oxide scale, 15-30 parts by mass of blast furnace gas mud and 30-40 parts by mass of dust removal ash are added to the primary mixing material, and stirred to obtain a secondary mixing material.

然后将二次混匀料加压成型,干燥至水分含量小于2wt%,制得复合冷压球团。Then, the secondary mixed material is press-molded and dried to a moisture content of less than 2 wt % to prepare a composite cold-pressed pellet.

所述有机酸为乙酸、草酸、柠檬酸中的一种。The organic acid is one of acetic acid, oxalic acid and citric acid.

所述轧钢油泥为轧钢厂在冷轧过程和热轧过程中采用化学法处理轧钢含油废水得到的固体废料。The rolling sludge is a solid waste obtained by chemically treating the rolling oily wastewater in the cold rolling process and the hot rolling process in the rolling mill.

所述炼钢污泥为氧气顶吹转炉湿法除尘得到的污泥。The steelmaking sludge is the sludge obtained by wet dust removal in an oxygen top-blown converter.

所述氧化铁皮为轧钢厂在轧制过程中轧件急剧冷却后钢材表面产生的含铁氧化物。The iron oxide scale is an iron-containing oxide produced on the surface of the steel after the rolling stock is rapidly cooled in the rolling process in the rolling mill.

所述高炉瓦斯泥为高炉炼铁过程中采用湿式除尘系统后经沉淀处理所得的污泥。The blast furnace gas sludge is the sludge obtained by precipitation after adopting a wet dust removal system in the blast furnace ironmaking process.

所述除尘灰为烧结、炼铁、炼钢过程中产生的重力除尘灰。The dust-removing dust is gravity dust-removing dust produced in the process of sintering, iron-making and steel-making.

由于采用上述技术方案,本发明与现有技术相比的有益效果为:Due to adopting the above-mentioned technical scheme, the beneficial effects of the present invention compared with the prior art are:

(1)本发明通过有机酸改性轧钢油泥和炼钢污泥替代粘结剂,制备高性能复合冷压球团,使得钢铁企业难以处理的轧钢油泥和炼钢污泥得以回收利用,解决了钢铁企业轧钢油泥和炼钢污泥在厂内大量堆积、占用土地和污染环境的问题,降低了环境污染。(1) The present invention prepares high-performance composite cold-pressed pellets by replacing the binder with organic acid-modified steel rolling sludge and steelmaking sludge, so that the rolling sludge and steelmaking sludge that are difficult to be handled by iron and steel enterprises can be recycled and utilized, solving the problem of Steel rolling sludge and steelmaking sludge accumulate in large quantities in the factory, occupying land and polluting the environment, reducing environmental pollution.

(2)本发明通过有机酸改性轧钢油泥和炼钢污泥替代粘结剂,制备高性能复合冷压球团,无需其它粘结剂的添加,无需特殊设备,不仅降低了生产复合冷压球团的成本,且制备的转炉炼钢用复合冷压球团抗压强度高。(2) The present invention uses organic acid modified steel rolling sludge and steelmaking sludge to replace the binder to prepare high-performance composite cold-pressed pellets without the addition of other binders and special equipment, which not only reduces the production of composite cold-pressed pellets The cost of pellets is high, and the prepared composite cold-pressed pellets for converter steelmaking have high compressive strength.

(3)本发明通过使用轧钢油泥、炼钢污泥、氧化铁皮、高炉瓦斯泥和除尘灰制备复合冷压球团,原料全部为钢铁企业固废,没有使用铁精矿,配料易得,工艺简单,可扩展性强。(3) The present invention prepares composite cold-pressed pellets by using steel rolling sludge, steelmaking sludge, iron oxide scale, blast furnace gas sludge and dust removal ash. Simple and scalable.

因此,本发明具有工艺简单、生产成本低、对设备无特殊要求和能降低环境污染的特点,所制备的转炉炼钢用复合冷压球团抗压强度高。Therefore, the invention has the characteristics of simple process, low production cost, no special requirements for equipment, and can reduce environmental pollution, and the prepared composite cold-pressed pellets for converter steelmaking have high compressive strength.

具体实施方式Detailed ways

下面结合具体实施方式对本发明作进一步的描述,并非对本发明的保护范围的限定。The present invention will be further described below with reference to the specific embodiments, which are not intended to limit the protection scope of the present invention.

一种转炉炼钢用复合冷压球团的制备方法。本具体实施方式的制备方法是:A preparation method of composite cold-pressed pellets for converter steelmaking. The preparation method of this specific embodiment is:

将5~15质量份的轧钢油泥、5~15质量份的炼钢污泥和2~8质量份的有机酸混匀,在20~60℃条件下静置20~60min,得到一次混匀料。Mix 5-15 parts by mass of steel sludge, 5-15 parts by mass of steel-making sludge and 2-8 parts by mass of organic acid, and let stand for 20-60 minutes at 20-60°C to obtain a primary mixing material .

再将15~25质量份的氧化铁皮,15~30质量份的高炉瓦斯泥和30~40质量份的除尘灰加入所述一次混匀料,搅拌,得到二次混匀料。Then, 15-25 parts by mass of iron oxide scale, 15-30 parts by mass of blast furnace gas mud and 30-40 parts by mass of dust removal ash are added to the primary mixing material, and stirred to obtain a secondary mixing material.

然后将二次混匀料加压成型,干燥至水分含量小于2wt%,制得复合冷压球团。Then, the secondary mixed material is press-molded and dried to a moisture content of less than 2 wt % to prepare a composite cold-pressed pellet.

所述有机酸为乙酸、草酸、柠檬酸中的一种。The organic acid is one of acetic acid, oxalic acid and citric acid.

本具体实施方式中,下述技术特征在各实施例中相同:In this specific embodiment, the following technical features are the same in each embodiment:

所述轧钢油泥为钢铁企业冷轧、热轧过程中采用化学法处理轧钢含油废水得到的固体废料;The steel rolling sludge is solid waste obtained by chemically treating the oil-containing wastewater from steel rolling during cold rolling and hot rolling in iron and steel enterprises;

所述炼钢污泥为氧气顶吹转炉湿法除尘得到的污泥;The steelmaking sludge is the sludge obtained by wet dust removal in an oxygen top-blown converter;

所述氧化铁皮为轧钢厂在轧制过程中轧件急剧冷却后钢材表面产生的含铁氧化物;The iron oxide scale is iron-containing oxides produced on the surface of the steel after the rolling stock is rapidly cooled in the rolling process in the rolling mill;

所述高炉瓦斯泥为高炉炼铁过程中采用湿式除尘系统后经沉淀处理所得的污泥;The blast furnace gas sludge is the sludge obtained by the precipitation treatment after adopting the wet dust removal system in the blast furnace ironmaking process;

所述除尘灰为烧结、炼铁、炼钢过程中产生的重力除尘灰。The dust-removing dust is gravity dust-removing dust produced in the process of sintering, iron-making and steel-making.

实施例中不再赘述。It is not repeated in the embodiment.

实施例1Example 1

一种转炉炼钢用复合冷压球团的制备方法。本实施例的制备方法是:A preparation method of composite cold-pressed pellets for converter steelmaking. The preparation method of the present embodiment is:

将8质量份的轧钢油泥、5质量份的炼钢污泥和2质量份的有机酸混匀,在20℃条件下静置60min,得到一次混匀料。8 parts by mass of steel rolling sludge, 5 parts by mass of steelmaking sludge and 2 parts by mass of organic acid were mixed uniformly, and allowed to stand at 20° C. for 60 minutes to obtain a primary mixed material.

再将15质量份的氧化铁皮,30质量份的高炉瓦斯泥和40质量份的除尘灰加入所述一次混匀料,搅拌,得到二次混匀料。Then, 15 parts by mass of iron oxide scale, 30 parts by mass of blast furnace gas sludge and 40 parts by mass of dust removal ash were added to the primary mixed material, and stirred to obtain a secondary mixed material.

然后将二次混匀料加压成型,干燥至水分含量为1.2wt%,制得转炉炼钢用复合冷压球团。Then, the secondary mixed material is press-molded and dried to a moisture content of 1.2 wt % to prepare composite cold-pressed pellets for converter steelmaking.

所述有机酸为乙酸。The organic acid is acetic acid.

本实施例制备的转炉炼钢用复合冷压球团经测试,平均抗压强度为950N。The composite cold-pressed pellets for converter steelmaking prepared in this example were tested, and the average compressive strength was 950N.

一种对比例,所述对比例的制备方法除无有机酸外,其余与本实施例相同。制备的复合冷压球团的平均抗压强度为635N。A comparative example, the preparation method of the comparative example is the same as the present embodiment except that there is no organic acid. The average compressive strength of the prepared composite cold-pressed pellets was 635N.

实施例2Example 2

一种转炉炼钢用复合冷压球团的制备方法。本实施例的制备方法是:A preparation method of composite cold-pressed pellets for converter steelmaking. The preparation method of the present embodiment is:

将5质量份的轧钢油泥、15质量份的炼钢污泥和8质量份的有机酸混匀,在40℃条件下静置40min,得到一次混匀料。5 parts by mass of steel rolling sludge, 15 parts by mass of steelmaking sludge and 8 parts by mass of organic acid were mixed uniformly, and allowed to stand at 40° C. for 40 min to obtain a primary mixed material.

再将25质量份的氧化铁皮,15质量份的高炉瓦斯泥和32质量份的除尘灰加入所述一次混匀料,搅拌,得到二次混匀料。Then, 25 parts by mass of iron oxide scale, 15 parts by mass of blast furnace gas mud and 32 parts by mass of dust removal ash were added to the primary mixed material, and stirred to obtain a secondary mixed material.

然后将二次混匀料加压成型,干燥至水分含量为0.9wt%,制得转炉炼钢用复合冷压球团。Then, the secondary mixed material is press-molded and dried to a moisture content of 0.9 wt % to prepare composite cold-pressed pellets for converter steelmaking.

所述有机酸为草酸。The organic acid is oxalic acid.

本实施例制备的转炉炼钢用复合冷压球团经测试,平均抗压强度为1275N。The composite cold-pressed pellets for converter steelmaking prepared in this example were tested, and the average compressive strength was 1275N.

一种对比例,所述对比例的制备方法除无有机酸外,其余与本实施例相同。制备的复合冷压球团的平均抗压强度为456N。A comparative example, the preparation method of the comparative example is the same as the present embodiment except that there is no organic acid. The average compressive strength of the prepared composite cold-pressed pellets was 456N.

实施例3Example 3

一种转炉炼钢用复合冷压球团的制备方法。本实施例的制备方法是:A preparation method of composite cold-pressed pellets for converter steelmaking. The preparation method of the present embodiment is:

将15质量份的轧钢油泥、7质量份的炼钢污泥和5质量份的有机酸混匀,在60℃条件下静置20min,得到一次混匀料。15 parts by mass of steel rolling sludge, 7 parts by mass of steelmaking sludge and 5 parts by mass of organic acid were mixed uniformly, and allowed to stand at 60° C. for 20 minutes to obtain a primary mixed material.

再将20质量份的氧化铁皮,23质量份的高炉瓦斯泥和30质量份的除尘灰加入所述一次混匀料,搅拌,得到二次混匀料。Then, 20 parts by mass of iron oxide scale, 23 parts by mass of blast furnace gas sludge and 30 parts by mass of dust-removing ash are added to the primary mixed material, and stirred to obtain a secondary mixed material.

然后将二次混匀料加压成型,干燥至水分含量位0.8wt%,制得转炉炼钢用复合冷压球团。Then, the secondary mixed material is press-molded and dried to a moisture content of 0.8 wt % to prepare composite cold-pressed pellets for converter steelmaking.

所述有机酸为柠檬酸。The organic acid is citric acid.

本实施例制备的转炉炼钢用复合冷压球团经测试,平均抗压强度为1745N。The composite cold-pressed pellets for converter steelmaking prepared in this example have been tested, and the average compressive strength is 1745N.

一种对比例,所述对比例的制备方法除无有机酸外,其余与本实施例相同。制备的复合冷压球团的平均抗压强度为542N。A comparative example, the preparation method of the comparative example is the same as the present embodiment except that there is no organic acid. The average compressive strength of the prepared composite cold-pressed pellets was 542N.

本具体实施方式与现有技术相比的有益效果为:The beneficial effects of this specific embodiment compared with the prior art are:

(1)本具体实施方式通过有机酸改性轧钢油泥和炼钢污泥替代粘结剂,制备高性能复合冷压球团,使得钢铁企业难以处理的轧钢油泥和炼钢污泥得以回收利用,解决了钢铁企业轧钢油泥和炼钢污泥在厂内大量堆积、占用土地和污染环境的问题,降低了环境污染。(1) This specific embodiment uses organic acid-modified steel rolling sludge and steelmaking sludge to replace the binder to prepare high-performance composite cold-pressed pellets, so that the rolling sludge and steelmaking sludge that are difficult for iron and steel enterprises to handle can be recycled, It solves the problems that steel rolling sludge and steelmaking sludge accumulate in the factory in large quantities, occupying land and polluting the environment, reducing environmental pollution.

(2)本具体实施方式通过有机酸改性轧钢油泥和炼钢污泥替代粘结剂,制备高性能复合冷压球团,无需其它粘结剂的添加,无需特殊设备,不仅降低了生产复合冷压球团的成本,且制备的转炉炼钢用复合冷压球团抗压强度高。(2) This specific embodiment uses organic acid to modify the rolling sludge and steelmaking sludge to replace the binder to prepare high-performance composite cold-pressed pellets without the addition of other binders and special equipment, which not only reduces the production complex The cost of cold-pressed pellets is high, and the prepared composite cold-pressed pellets for converter steelmaking have high compressive strength.

(3)本具体实施方式通过使用轧钢油泥、炼钢污泥、氧化铁皮、高炉瓦斯泥和除尘灰制备复合冷压球团,原料全部为钢铁企业固废,没有使用铁精矿,配料易得,工艺简单,可扩展性强。(3) In this specific embodiment, composite cold-pressed pellets are prepared by using steel rolling sludge, steelmaking sludge, iron oxide scale, blast furnace gas sludge and dust removal ash. , the process is simple and the scalability is strong.

因此,本具体实施方式具有工艺简单、生产成本低、对设备无特殊要求和能降低环境污染的特点,所制备的转炉炼钢用复合冷压球团抗压强度高。Therefore, this specific embodiment has the characteristics of simple process, low production cost, no special requirements for equipment, and can reduce 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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