CN110592373A - Binder for forming enriched sludge of converter with high CaO content and preparation method of pellets of binder - Google Patents
Binder for forming enriched sludge of converter with high CaO content and preparation method of pellets of binder Download PDFInfo
- Publication number
- CN110592373A CN110592373A CN201911001705.4A CN201911001705A CN110592373A CN 110592373 A CN110592373 A CN 110592373A CN 201911001705 A CN201911001705 A CN 201911001705A CN 110592373 A CN110592373 A CN 110592373A
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- China
- Prior art keywords
- converter
- enriched sludge
- pellets
- cao content
- binder
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Classifications
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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
- C22B1/2413—Binding; Briquetting ; Granulating enduration of pellets
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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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- 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
Abstract
The invention discloses a binder for forming enriched sludge of a converter with high CaO content, which is prepared by uniformly mixing 7.0-7.4 parts by mass of sodium carboxymethylcellulose, 1.8-2.3 parts by mass of asphalt, 0.3-1.0 part by mass of polyvinyl alcohol and 0.2-0.3 part by mass of polyacrylamide. The invention also discloses a method for preparing the enriched sludge pellets of the converter with high CaO content by adopting the binder. The high-CaO-content enriched sludge pellets obtained by the invention have high dropping strength and low crushing, so that the pellets have high utilization rate, small dust and reduced environmental protection pressure in the process of entering the converter.
Description
Technical Field
The invention relates to the field of metallurgy, and in particular relates to a binder for forming enriched sludge of a converter with high CaO content and a preparation method of pellets of the binder.
Background
The smoke dust generated in the production process of the steel converter is used as converter sludge after wet dust removal, and is used as enriched sludge to obtain an iron-containing secondary resource after reselection or magnetic separation enrichment. Because the water content of the enriched sludge is large, part of water needs to be removed by drying, but the enriched sludge exists in powder form after dehydration and cannot be directly put into a furnace for recycling, so that the enriched sludge needs to be pressed into balls so as to be convenient for putting into the furnace for recycling.
The performance of the existing enriched sludge pellet is as follows: the falling strength of 2m of the enriched sludge is 1-3 times per piece, the crushing rate (the mass ratio of 2m falling for 3 times and less than 5 mm) is 27-31%, the falling strength of 2m of the enriched sludge is 3-5 times per piece, and the crushing rate is 6-10%. Because 2m of pellets of gravity-concentration enriched sludge has low dropping strength and the powder rate is up to more than 27%, the utilization rate of the gravity-concentration enriched sludge with high CaO content is low, dust is large, and the formula of a binder used by the gravity-concentration enriched sludge with high CaO content and a pellet pressing scheme need to be optimized and improved, so that the dropping strength of the pellets is improved, and the crushing rate is reduced.
In the prior art, a method for preparing pellets by aiming at converter fly ash with high CaO content generally needs to add sintered return ores to dilute the CaO content in the fly ash, and simultaneously needs to perform digestion and one-time prepressing for a certain time, so that the production efficiency is reduced, the proportion adding amount of a binder is large, and the sulfur content of converter molten steel is increased by using the return ores.
In addition, a method for preparing pellets aiming at converter fly ash with high CaO content also exists, and cold-pressed pellets are prepared by utilizing a composite adhesive synthesized by syrup, carbonate and sodium carboxymethyl cellulose and converter fly ash according to a certain mass ratio. But the pellets have strong pungent odor before and after the reaction, and the drop strength of the prepared pellets is lower than that of the pellets with the particle size of 2 m.
Therefore, a preparation method of pellets for forming enriched sludge in a converter with high CaO content is still needed to overcome the problem of easy pulverization after forming caused by high CaO content, and the method has the advantages of simple steps, low cost, high pellet strength and low pulverization rate.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide the binder for forming the enriched sludge of the converter with high CaO content and the preparation method of the pellets thereof, and the obtained enriched sludge pellets with high CaO content have high falling strength and low crushing, so that the pellets have high utilization rate, small dust and reduced environmental protection pressure in the process of entering the converter.
Based on the purpose, the following technical scheme is adopted:
according to the invention, the binder for forming the enriched sludge of the converter with high CaO content comprises, by mass, 7.0-7.4 parts of sodium carboxymethylcellulose, 1.8-2.3 parts of asphalt, 0.3-1.0 part of polyvinyl alcohol and 0.2-0.3 part of polyacrylamide.
Furthermore, the granularity of the sodium carboxymethylcellulose is smaller than 100 meshes, the granularity of the polyvinyl alcohol is smaller than 100 meshes, the granularity of the asphalt is smaller than 80 meshes, and the granularity of the polyacrylamide is smaller than 80 meshes.
Further, the polyacrylamide is anionic polyacrylamide.
According to the invention, the method for preparing the enriched sludge pellets of the converter with high CaO content comprises the following steps:
the method comprises the following steps: drying the converter enriched sludge with high CaO content obtained by reselection;
step two: and (3) uniformly mixing the enriched sludge dried in the step one with the binder, and preparing the enriched sludge pellets after ball pressing and drying.
Further, the moisture mass content of the enriched sludge dried in the step one is between 4% and 6%.
Further, the mass content of CaO in the enriched sludge of the converter with high CaO content obtained by reselection in the step one is 8.35-11.59%.
Further, the mass ratio of the enriched sludge to the binder in the second step is 100 (1.0-1.2).
Further, the process of pressing the ball in the second step is as follows: the uniformly mixed material enters a ball press machine through an intermediate bin to be pressed and molded; wherein the pressure of the ball press is 3-5 Mpa, and the rotating speed is 0.47-0.48 m/s.
Further, the drying in the third step is selected from one or more of natural drying or flue gas drying.
Further, the natural drying time is 4 days; the temperature for drying the flue gas is 90-110 ℃, and the time is 1.5-2 h.
The invention has the beneficial effects that:
the binder disclosed by the invention has the advantages of no smell, small addition amount, high pellet strength and high production efficiency. The binder is formed by mixing organic matters, other impurity elements cannot be brought in, and the converter slag amount is increased.
The pellet prepared by the invention has high falling strength and low pellet crushing rate of the enriched sludge pellet produced by using the binder. Specifically, the highest falling strength of the enriched sludge pellets for 2m can reach 89.8 times per pellet, and the lowest crushing rate of the pellets falling for 3 times for 2m can reach 0.63 percent.
The preparation method of the invention adopts flue gas drying to improve the production efficiency, and the cost of the ton pellet binder of the enriched sludge pellets is reduced by more than 40%.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some implementation examples of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
FIG. 1 is a flow chart of a preparation method of enriched sludge pellets of a converter with high CaO content according to an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the following embodiments of the present invention are described in further detail with reference to the accompanying drawings.
As shown in FIG. 1, the method for preparing enriched sludge pellets by using the binder for enriched sludge of the converter with high CaO content, which is provided by the invention, comprises the following specific steps:
(1) and preparing a binder. Uniformly mixing 7.0-7.4 parts by mass of sodium carboxymethylcellulose, 1.8-2.3 parts by mass of asphalt, 0.3-1.0 part by mass of polyvinyl alcohol and 0.2-0.3 part by mass of anionic polyacrylamide. Wherein the granularity of the sodium carboxymethylcellulose and the polyvinyl alcohol is less than 100 meshes, and the granularity of the asphalt and the polyacrylamide is less than 80 meshes.
(2) The enriched sludge obtained by gravity separation is pre-dried until the moisture mass content is between 4% and 6%, so that the caking of the binder due to too high moisture is prevented, the binder is fully mixed, the material mixing time is shortened, and meanwhile, 4% to 6% of the enriched sludge is appropriate in moisture content required by the enriched sludge forming, and no additional moisture is required to be added.
(3) And (3) pre-drying the enriched sludge and (1) preparing a binder according to the mass ratio of 100 to (1.0-1.2), adding the mixture into a mixer from a storage bin through a conveying belt, and stirring for 5-6 min to mix uniformly.
(4) And the uniformly mixed material enters a ball press machine through an intermediate bin for pressing and forming. The material level detection device is arranged in the intermediate bin, the valve is opened at a certain height after the enriched sludge is accumulated, the situation that the ball socket of the ball press is not filled with the enriched sludge and the extrusion density is small, the pellets are easy to break is avoided, and the pelletizing rate and the pellet falling strength are improved. The pressure of the ball press is 3-5 Mpa, and the rotating speed is 0.47-0.48 m/s.
(5) And screening the pressed enriched sludge green pellets, feeding the screened enriched sludge green pellets into a chain dryer or putting the screened enriched sludge green pellets into an air-drying storage yard, naturally drying for 4 days or drying for 1.5-2 hours by using flue gas at 90-110 ℃ to obtain finished enriched sludge green pellets with the moisture content less than 3%, and returning the powder to a pellet pressing bin through a material returning belt for re-pelletizing.
The main chemical components of the enriched sludge obtained by reselection are shown in table 1, and it can be seen that the CaO content of the enriched sludge obtained by reselection is far higher than that of the enriched sludge obtained by magnetic separation.
Specifically, the reselected enriched sludge comprises, by mass, 61.38-67.43% of TFe, 0.083-0.097% of P (phosphorus), 0.018-0.027% of S (sulfur), 8.35-11.59% of CaO, and SiO28.62-10.37 mass%, the balance being impurities.
The magnetic separation enriched sludge comprises 77.19-79.37 wt% of TFe, 0.091-0.11 wt% of P (phosphorus), 0.021-0.044 wt% of S (sulfur), 3.77-4.83 wt% of CaO, and SiO24.33-5.60 mass%, the balance being impurities.
TABLE 1 enrichment of the main chemical composition of the sludge%
In examples 1 to 7 using the above-described preparation process, the amounts of each component added, the preparation conditions, and the pellet strength and the pulverization rate are shown in table 2, wherein the amount of the enriched sludge obtained by the gravity separation in examples 1 to 7 is 100 parts by mass.
TABLE 2 composition content and pellet Property data for examples 1-7
Wherein, in table 2, the molecular weight of polyacrylamide in examples 1, 2, 4, 7 is 2200 ten thousand; the molecular weight of the polyacrylamide in example 3 is 1800 ten thousand; the molecular weight of the polyacrylamide in examples 5 and 6 is 1600 ten thousand.
In Table 2, 1788 type polyvinyl alcohol was used as the polyvinyl alcohol in examples 1, 2, 5 and 6, and the alcoholysis degree was 87.0-89.0% (mol/mol) and the polymerization degree was 1700; in examples 3 and 7, 2488 type polyvinyl alcohol was used as polyvinyl alcohol, which had an alcoholysis degree of 87.0 to 89.0% (mol/mol) and a polymerization degree of 2400; in example 4, 2088 type polyvinyl alcohol was used as the polyvinyl alcohol, which had an alcoholysis degree of 87.0 to 89.0% (mol/mol) and a polymerization degree of 2000.
In table 2, the loss ratio of 10 times of the sand grinding is the mass loss of the pellet after the molded pellet is ground by 10 revolutions using a metallographic specimen polisher having a polishing disc diameter of Φ 200, and the sand grinding is coarse sand of 100 mesh.
As can be seen from Table 2, the pellet crushing rate of the enriched sludge pellets of examples 1-7 after dropping for 2m is as high as 89.8 times/piece, the pellet crushing rate of the enriched sludge pellets after dropping for 3 times for 2m is as low as 0.63%, the loss proportion of the enriched sludge pellets after 10 times of sand grinding is less than 1.73%, the performance of the enriched sludge pellets is far superior to that of the pellets prepared by adopting the converter enriched sludge with high CaO content in the prior art, the problem of easy pulverization after molding caused by high CaO content is solved, and the method has the advantages of simple steps, low cost, high pellet strength and low crushing rate.
The specific principle is as follows:
anionic polyacrylamide and enrichment of free Ca (OH) in sludge2Reaction to form structurally denseThe gel is filled in the sludge-enriched gaps, plays a role in flexibility and reinforcement, and increases the binding force between the gel and the sludge-enriched particles; meanwhile, the carboxymethyl cellulose part generates calcification reaction to generate carboxymethyl cellulose calcium, and the anionic polyacrylamide and the carboxymethyl cellulose reduce free Ca (OH) in the enriched sludge2The content, the residual carboxymethyl cellulose and polyvinyl alcohol which do not participate in the reaction are used as binders to form the pellets. In addition, the anionic polyacrylamide and polyvinyl alcohol can improve the demolding effect, improve the pelletizing rate, improve the wear resistance of the pellets and reduce the friction loss of the pellets.
The foregoing is an exemplary embodiment of the present disclosure, but it should be noted that various changes and modifications could be made herein without departing from the scope of the present disclosure as defined by the appended claims. Furthermore, although elements of the disclosed embodiments of the invention may be described or claimed in the singular, the plural is contemplated unless limitation to the singular is explicitly stated.
It should be understood that, as used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly supports the exception. It should also be understood that "and/or" as used herein is meant to include any and all possible combinations of one or more of the associated listed items.
The numbers of the embodiments disclosed in the embodiments of the present invention are merely for description, and do not represent the merits of the embodiments.
Those of ordinary skill in the art will understand that: the discussion of any embodiment above is meant to be exemplary only, and is not intended to intimate that the scope of the disclosure, including the claims, of embodiments of the invention is limited to these examples; within the idea of an embodiment of the invention, also technical features in the above embodiment or in different embodiments may be combined and there are many other variations of the different aspects of an embodiment of the invention as described above, which are not provided in detail for the sake of brevity. Therefore, any omissions, modifications, substitutions, improvements, and the like that may be made without departing from the spirit and principles of the embodiments of the present invention are intended to be included within the scope of the embodiments of the present invention.
Claims (10)
1. The binder for forming the enriched sludge of the converter with the high CaO content is characterized by comprising 7.0-7.4 parts by mass of sodium carboxymethylcellulose, 1.8-2.3 parts by mass of asphalt, 0.3-1.0 part by mass of polyvinyl alcohol and 0.2-0.3 part by mass of polyacrylamide.
2. The binder for forming the enriched sludge of the converter with high CaO content according to claim 1, wherein the granularity of the sodium carboxymethyl cellulose is less than 100 meshes, the granularity of the polyvinyl alcohol is less than 100 meshes, the granularity of the asphalt is less than 80 meshes, and the granularity of the polyacrylamide is less than 80 meshes.
3. The binder for forming the sludge enriched in the converter with high CaO content according to claim 2, wherein the polyacrylamide is anionic polyacrylamide.
4. A method for preparing enriched sludge pellets of a converter with high CaO content is characterized by comprising the following steps:
the method comprises the following steps: drying the converter enriched sludge with high CaO content obtained by reselection;
step two: uniformly mixing the enriched sludge dried in the step one with the binder as defined in any one of claims 1 to 3, and preparing the enriched sludge pellets after ball pressing and drying.
5. The method for preparing the enriched sludge pellets of the converter with high CaO content according to claim 1, wherein the moisture content of the enriched sludge after drying in the first step is between 4% and 6% by mass.
6. The method for preparing the enriched sludge pellets of the converter with the high CaO content according to claim 1, wherein the mass content of CaO in the enriched sludge of the converter with the high CaO content obtained by reselection in the first step is 8.35-11.59%.
7. The method for preparing the enriched sludge pellets of the converter with high CaO content according to claim 3, wherein the mass ratio of the enriched sludge and the binder in the second step is 100 (1.0-1.2).
8. The method for preparing enriched sludge pellets of the converter with high CaO content according to claim 1, wherein the process of pressing the pellets in the second step is as follows: the uniformly mixed material enters a ball press machine through an intermediate bin to be pressed and molded; wherein the pressure of the ball press is 3-5 Mpa, and the rotating speed is 0.47-0.48 m/s.
9. The method for preparing high-CaO content enriched sludge pellets of a converter according to claim 1, wherein the drying in the third step is selected from one or more of natural drying and flue gas drying.
10. The method for preparing the enriched sludge pellet of the converter with high CaO content according to claim 9, wherein the natural drying time is 4 days; the temperature for drying the flue gas is 90-110 ℃, and the time is 1.5-2 h.
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| CN201911001705.4A CN110592373A (en) | 2019-10-21 | 2019-10-21 | Binder for forming enriched sludge of converter with high CaO content and preparation method of pellets of binder |
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| CN201911001705.4A CN110592373A (en) | 2019-10-21 | 2019-10-21 | Binder for forming enriched sludge of converter with high CaO content and preparation method of pellets of binder |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113122710A (en) * | 2021-03-16 | 2021-07-16 | 赵万英 | Composite pellet soil additive and composite pellet soil production method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101805827A (en) * | 2009-02-12 | 2010-08-18 | 宝山钢铁股份有限公司 | Purpose of heavy metal sludge, acid pellet and preparation method and purpose thereof |
| CN102674341A (en) * | 2012-05-14 | 2012-09-19 | 李钱胜 | Columnar activated carbon based on coal pitch binders and preparation method of columnar activated carbon |
| CN109112297A (en) * | 2018-10-19 | 2019-01-01 | 攀钢集团攀枝花钢铁研究院有限公司 | Converter is enriched with sludge molding binder and converter is enriched with sludge forming method |
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2019
- 2019-10-21 CN CN201911001705.4A patent/CN110592373A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101805827A (en) * | 2009-02-12 | 2010-08-18 | 宝山钢铁股份有限公司 | Purpose of heavy metal sludge, acid pellet and preparation method and purpose thereof |
| CN102674341A (en) * | 2012-05-14 | 2012-09-19 | 李钱胜 | Columnar activated carbon based on coal pitch binders and preparation method of columnar activated carbon |
| CN109112297A (en) * | 2018-10-19 | 2019-01-01 | 攀钢集团攀枝花钢铁研究院有限公司 | Converter is enriched with sludge molding binder and converter is enriched with sludge forming method |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113122710A (en) * | 2021-03-16 | 2021-07-16 | 赵万英 | Composite pellet soil additive and composite pellet soil production method |
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Application publication date: 20191220 |
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