CN110699543A - Method for preparing iron ore sintered pellet binder by using steel oily sludge, binder and application - Google Patents
Method for preparing iron ore sintered pellet binder by using steel oily sludge, binder and application Download PDFInfo
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- CN110699543A CN110699543A CN201911153034.3A CN201911153034A CN110699543A CN 110699543 A CN110699543 A CN 110699543A CN 201911153034 A CN201911153034 A CN 201911153034A CN 110699543 A CN110699543 A CN 110699543A
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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
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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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Abstract
The invention discloses a method for preparing an iron ore sintered pellet binder by using steel oily sludge, a binder and application. The iron and steel oily sludge is subjected to solid-liquid separation I, the obtained dust sludge is subjected to solid-liquid separation II after catalytic oxidation treatment, and the iron ore sintering pellet binder is obtained.
Description
Technical Field
The invention relates to an iron ore sintering binder, in particular to a method for preparing the iron ore sintering binder by utilizing oily sludge obtained by treating steel rolling oily wastewater by a chemical method in the cold rolling and hot rolling processes in the steel industry, and also relates to a method for using the binder for iron ore sintering or pelletizing process granulation and pelletizing, belonging to the field of solid waste treatment and resource utilization.
Background
The oily sludge of steel is a solid waste with large output, high treatment difficulty and great harm generated in the production process of the steel industry. The emulsion is mainly produced in the steel-making process and the steel rolling process, is a water-in-oil type emulsion formed by three phases of water, oil and solid particles, and has the characteristics of complex components, high viscosity, difficult solid-liquid separation and the like. At present, the national records of dangerous solid waste are listed.
At present, the treatment method of oil sludge at home and abroad is mainly divided into a harmless treatment technology and a recycling treatment technology. The harmless treatment technology mainly comprises an incineration method, a solidification method, a pyrolysis method and the like, secondary pollution is still caused, a large amount of land is occupied, and oil substances and valuable elements in dust and mud cannot be recovered. The resource treatment technology mainly comprises a mechanical separation method, a solvent extraction method, a surfactant method, an ultrasonic treatment method, a microwave treatment method and the like, but the methods have the problems of incomplete treatment, secondary pollution, incapability of large-scale application and the like, and limit the resource utilization of the oily sludge.
The iron ore sintering and pelletizing process is a relatively complete production process, and returns the steel sludge to the sintering or pelletizing process in the steel production flow, so that the resource utilization of the steel sludge can be realized, and valuable elements in the steel sludge can be recovered. At present, the utilization of iron-containing dust such as blast furnace gas ash, converter sludge, electric furnace dust removal ash, sintering dust, and the like in the sintering and pelletizing process for resource utilization has been reported. However, the oily sludge has complex components and high oil content, and the oily sludge has strong hydrophobicity on the surface due to oil stain wrapping, so that the granulation and pelletizing are adversely affected, and therefore, the oily sludge is only recently reported to be directly applied to the sintering and pelletizing process.
Disclosure of Invention
Aiming at the problems of large output of oily sludge, harmless treatment and high difficulty in resource utilization in the steel industry at present, the first purpose of the invention is to provide a method for enabling the surface of the oily sludge of steel to have hydrophilic and mineral affinity and show good bonding performance through catalytic oxidation.
The second purpose of the invention is to provide an iron ore sintered pellet binder which is easy to obtain, low in cost and has good pelletizing and pelletizing performance.
The third purpose of the invention is to provide the application of the iron ore sintered pellet binder, and the pelletizing and pelletizing can improve the strength and the anti-explosion performance of the pellets or the aggregates.
In order to achieve the technical purpose, the invention provides a method for preparing an iron ore sintered pellet binder by using steel oily sludge.
The technical scheme of the invention is based on the characteristic that the steel oily sludge is composed of three phases of water, oil and solid particles and has complex components, firstly, the steel oily sludge is subjected to solid-liquid separation pretreatment to reduce the oil content of the dust sludge, then the dust sludge is subjected to catalytic oxidation treatment, oily hydrophobic substances are oxidized into hydrophilic substances dissolved in water, oily organic substances on the surface of the oily hydrophobic substances are removed, and meanwhile, the surface of the dust sludge is activated to fully expose the hydrophilic and mineral-hydrophilic properties, so that the surface bonding property of the dust sludge is improved, and the iron ore sintering can be realized by using the oily sludge as a binder. The modified dust and sludge is used for iron ore sintering and pelletizing processes, so that the pelletizing and pelletizing performance can be improved, the harmless treatment and resource utilization of the oily sludge are realized, and the aim of comprehensively utilizing solid wastes is fulfilled.
In a preferable scheme, the solid-liquid separation adopts a centrifugal separation or suction filtration separation mode.
In a preferable scheme, the solid-liquid separation I controls the oil content in the dust mud to be below 5 percent so as to improve the efficiency of the subsequent oxidation reaction, reduce the using amount of an oxidant and save the cost.
In a preferred scheme, hydrogen peroxide is used as an oxidant and an iron-containing material is used as a catalyst in the catalytic oxidation treatment. The advanced catalytic oxidation system can be formed by hydrogen peroxide and iron-containing materials.
In the preferable scheme, the mass ratio of the hydrogen peroxide to the oil content in the dust mud is 2: 1-6: 1.
In the preferred scheme, the mass of the iron-containing material is 5-10% of the mass of the dust and mud.
In a preferred scheme, the iron-containing material is iron sheet produced by steel rolling, and the iron sheet is finely ground until the granularity is below 0.074 mm.
In a preferred scheme, the mass percentage concentration of the hydrogen peroxide is 10-30%.
In a preferred embodiment, the conditions of the catalytic oxidation treatment are as follows: the liquid-solid ratio is 1-2 mL:1g, the stirring speed is 100-300 r/min, the pH is 2-4, the temperature is 20-80 ℃, and the time is 30-60 min. The preferable reaction conditions ensure the smooth occurrence of the catalytic oxidation reaction, and has the advantages of faster reaction rate, reduced reaction time and reduced consumption of the oxidant. The catalytic oxidation treatment process comprises the steps of mixing 1-2 mL of dust mud, 1g of hydrogen peroxide and iron-containing materials, oxidizing for 30-60 min at the temperature of 20-80 ℃ and under the condition that the pH value is 2-4 under the stirring action of 100-300 r/min, and carrying out solid-liquid separation.
In a preferred scheme, the oily sludge of steel is a product obtained by treating oily wastewater of steel rolling by a chemical method in the cold rolling and hot rolling processes of steel enterprises. The raw material of the oily sludge of steel which is difficult to be directly utilized by iron ore sintering can be pretreated by the technical scheme of the invention to obtain the binder which can be directly used for iron ore sintering.
The invention provides an iron ore sintered pellet binder, which is prepared by the method.
The invention also provides an application of the iron ore sintered pellet binder, and the iron ore sintered pellet binder is applied to granulation and pelletizing in a sintered pellet process.
Compared with the prior art, the technical scheme of the invention has the advantages that:
1) the invention carries out solid-liquid separation pretreatment on the oily sludge of the steel, pertinently reduces the oil content in the separated dust and sludge, effectively reduces the consumption of the oxidant in the subsequent catalytic oxidation process, and saves the cost.
2) The invention uses the iron sheet generated by steel rolling as the catalyst of oxidation reaction, which not only increases the oxidation reaction rate and improves the oxidation effect, but also can realize the recovery of valuable metal of the iron sheet, thereby achieving the effect of treating waste by waste.
3) The invention carries out surface modification treatment on the oily sludge of the steel by a catalytic oxidation method, can remove oil stains wrapped on the surface of the oily sludge of the steel, can activate the hydrophilic and mineral affinity of the surface of the oily sludge of the steel, obtains slurry-like materials with good bonding property, can be used for iron ore sintering or pelletizing process to improve the pelletizing or pelletizing performance, simultaneously realizes the recovery of valuable metals of the iron ore sintering or pelletizing process, and realizes the resource utilization of solid wastes.
Drawings
FIG. 1 is a process flow chart of a method for improving the binding property of steel oily sludge through catalytic oxidation.
Detailed Description
In order to facilitate an understanding of the invention, the invention will be described in more complete detail with reference to the preferred embodiments, but the scope of the invention is not limited to the specific embodiments described below.
Unless otherwise defined, all terms of art used hereinafter have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the present invention.
Unless otherwise specified, the reagents and materials used in the present invention are commercially available products or products obtained by a known method.
Comparative example 1
Separating oil sludge, directly adding into magnetite without catalytic oxidation, adding 10% sludge, mixing uniformly, pressing into cylindrical blocks with diameter of 10mm and height of 10mm, detecting that the compression strength of the blocks is 19.5N/block, the drop strength is 1.1 times/(0.5 m.block), and the cracking proportion at 450 ℃ is 32%.
Example 1
Mechanically separating oily sludge, controlling oil content in the separated sludge to be 5%, oxidizing the separated solid-phase sludge with hydrogen peroxide, and oxidizing H in the hydrogen peroxide2O2The content is 30%, the mass ratio of the hydrogen peroxide addition to the separated solid phase dust mud is 2:1, iron sheet with the granularity of being finely ground to be less than 0.074mm is added to the dust mud, the addition is 5%, the mixture is oxidized for 60min under the stirring action of 300r/min at the temperature of 20 ℃ and under the condition that the pH value is 2, and then the mechanical separation is carried out again. The separated dust and mud is added into magnetite with the proportion of 10 percent, the materials are uniformly mixed and pressed into cylindrical blocks with the diameter of 10mm and the height of 10mm, the compression strength of the detected blocks is improved to 27.7N/block, the falling strength is improved to 4.9 times/(0.5 m.block), and the cracking proportion at 450 ℃ is reduced to 5 percent.
Example 2
Mechanically separating oily sludge, controlling oil content in the separated sludge to be 5%, oxidizing the separated solid-phase sludge with hydrogen peroxide, and oxidizing H in the hydrogen peroxide2O2The content is 10%, the mass ratio of the hydrogen peroxide addition to the separated solid phase dust mud is 6:1, iron sheet with the granularity of being finely ground to be less than 0.074mm is added to the dust mud, the addition is 10%, under the stirring action of 100r/min, the mixture is oxidized for 30min under the conditions of the temperature of 80 ℃ and the pH value of 4, and then the mechanical separation is carried out again. The separated dust and mud is added into magnetite with the proportion of 10 percent, the materials are uniformly mixed and pressed into cylindrical blocks with the diameter of 10mm and the height of 10mm, the compression strength of the detected blocks is improved to 28.9N/block, the falling strength is improved to 6.3 times/(0.5 m.block), and the cracking proportion at 450 ℃ is reduced to 4 percent.
Example 3
Mechanically separating oily sludge, controlling oil content in the separated sludge to be 3%, oxidizing the separated solid-phase sludge with hydrogen peroxide, and oxidizing H in the hydrogen peroxide2O2The content is 20%, the mass ratio of the hydrogen peroxide addition to the separated solid phase dust mud is 4:1, iron sheet with the granularity of being finely ground to be less than 0.074mm is added to the dust mud, the addition is 8%, under the stirring action of 200r/min, the mixture is oxidized for 40min under the conditions of the temperature of 50 ℃ and the pH value of 3, and then the mechanical separation is carried out again. The separated dust and mud is added into magnetite with the proportion of 5 percent, the materials are uniformly mixed and pressed into cylindrical blocks with the diameter of 10mm and the height of 10mm, the compression strength of the detected blocks is improved to 41.0N/block, the falling strength is improved to 5.6 times/(0.5 m.block), and the cracking proportion at 450 ℃ is reduced to 2 percent.
TABLE 1 catalytic Oxidation Process conditions
TABLE 2 Effect of catalytic Oxidation on Mass of agglomerates
Claims (10)
1. A method for preparing iron ore sintered pellet binder by using steel oily sludge is characterized by comprising the following steps: and (2) carrying out solid-liquid separation I on the steel oily sludge, carrying out catalytic oxidation treatment on the obtained dust sludge, and carrying out solid-liquid separation II to obtain the steel oily sludge.
2. The method for preparing the iron ore sintered pellet binder by using the steel oily sludge as claimed in claim 1, which is characterized in that: and the solid-liquid separation I or the solid-liquid separation II adopts a centrifugal separation or suction filtration separation mode.
3. The method for preparing the iron ore sintered pellet binder by using the steel oily sludge as claimed in claim 1 or 2, which is characterized in that: and the solid-liquid separation I controls the oil content in the dust mud to be below 5 percent.
4. The method for preparing the iron ore sintered pellet binder by using the steel oily sludge as claimed in claim 1, which is characterized in that: the catalytic oxidation treatment adopts hydrogen peroxide as an oxidant and an iron-containing material as a catalyst.
5. The method for preparing the iron ore sintered pellet binder by using the steel oily sludge as claimed in claim 4, which is characterized in that: the mass ratio of the hydrogen peroxide to the oil content in the dust mud is 2: 1-6: 1; the mass of the iron-containing material is 5-10% of the mass of the dust mud.
6. The method for preparing the iron ore sintered pellet binder by using the steel oily sludge as claimed in claim 5, which is characterized in that:
the iron-containing material is iron sheet produced by steel rolling, and the iron sheet is finely ground until the granularity is below 0.074 mm;
the mass percentage concentration of the hydrogen peroxide is 10-30%.
7. The method for preparing iron ore sintered pellet binder by using steel oil-containing sludge as claimed in claim 1, 4, 5 or 6, wherein: the conditions of the catalytic oxidation treatment are as follows: the liquid-solid ratio is 1-2 mL:1g, the stirring speed is 100-300 r/min, the pH is 2-4, the temperature is 20-80 ℃, and the time is 30-60 min.
8. The method for preparing the iron ore sintered pellet binder by using the steel oily sludge as claimed in claim 1, which is characterized in that: the oily sludge of steel is a product obtained by treating oily wastewater of steel rolling by a chemical method in the cold rolling and hot rolling processes of steel enterprises.
9. The iron ore sintered pellet binder is characterized in that: prepared by the method of any one of claims 1 to 8.
10. The use of the binder for iron ore sintered pellets according to claim 9, wherein: the method is applied to granulation and pelletizing in a sintering and pelletizing process.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111437983A (en) * | 2020-02-13 | 2020-07-24 | 中南大学 | Method for efficiently activating pellet iron concentrate through high-pressure roller milling |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111437983B (en) * | 2020-02-13 | 2021-03-16 | 中南大学 | Method for efficiently activating pellet iron concentrate through high-pressure roller milling |
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