CN111118300A - Dust removal ball pressing forming method - Google Patents
Dust removal ball pressing forming method Download PDFInfo
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- CN111118300A CN111118300A CN202010058196.5A CN202010058196A CN111118300A CN 111118300 A CN111118300 A CN 111118300A CN 202010058196 A CN202010058196 A CN 202010058196A CN 111118300 A CN111118300 A CN 111118300A
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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
- C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
- C22B7/001—Dry processes
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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
-
- 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
- C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
- C22B7/02—Working-up flue dust
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- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Environmental & Geological Engineering (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Geochemistry & Mineralogy (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
A ball pressing and forming method of dedusting ash comprises the following steps: 1) the fly ash enters a first mixer from a raw material bin and is mixed by adding water; 2) entering a digestion bin for digestion; 3) the mixture enters a second mixer, and the binder, the iron powder and the water are added and mixed; 4) and (4) entering a ball press machine for prepressing, and then pressing the balls for forming. According to the dedusting ash ball pressing forming method disclosed by the application, the proportion of water and the binder is adjusted, and the proportion of pre-pressing, pre-pressing and main motor frequency is adjusted, so that the dedusting ash can be quickly subjected to ball pressing forming, and the balling rate is high.
Description
Technical Field
The present invention relates to the field of metallurgy, and in particular to the pretreatment of ores or waste materials.
Background
With the increasingly severe operating situation of the steel industry, cost reduction and efficiency improvement become the core part of the competitiveness of steel enterprises. The steel mill fly ash is used as a valuable secondary resource, and the recycling of the fly ash has great economic and social benefits for reducing smelting production cost and protecting environment.
The steel mill fly ash not only contains considerable iron, carbon and other elements (chromium, nickel and other elements in the stainless steel fly ash), but also contains certain amounts of calcium oxide, magnesium oxide, iron oxide, manganese oxide and the like, and is a metallurgical secondary resource with high recovery value. The addition of the fly ash pressing ball into the converter can also play a role in promoting slagging and reducing the temperature of a molten pool. However, the converter fly ash is powdery, so that the practical use is difficult. In order to reduce the production cost and increase the use amount of the converter fly ash, the fly ash needs to be pressed into balls and then fed.
The existing ball pressing and forming process has the problem of high forming difficulty and low ball pressing and forming rate.
Disclosure of Invention
In view of the above disadvantages of the prior art, the present invention provides a method for forming dust through ball pressing, which is used to solve the problems of low efficiency and low balling rate of dust through ball pressing in the prior art.
To achieve the above objects and other related objects, the present invention is achieved by the following technical solutions.
The invention provides a dust removal dust ball pressing forming method, which comprises the following steps:
1) the fly ash enters a first mixer from a raw material bin and is mixed by adding water;
2) entering a digestion bin for digestion;
3) the mixture enters a second mixer, and the binder, the iron powder and the water are added and mixed;
4) and (4) entering a ball press machine for prepressing, and then pressing the balls for forming.
According to the method for forming the pressed ball, in the step 1), the adding amount of the water is 5 wt% -6 wt% of the mass of the dedusting ash.
According to the method for forming the pressed ball, the digestion time in the step 2) is at least 20 hours. More preferably, in order to ensure that digestion is completed and improve the efficiency of ball pressing and forming, the digestion time is 20-24 hours.
According to the method for forming the pressed ball, in the step 3), the binder comprises the following raw material components in percentage by mass based on the total mass of the raw material components of the binder:
60-65 wt% of corn starch
25 to 28 weight percent of kudzuvine root powder
10-12 wt% of carboxymethyl cellulose.
The preparation method of the binder comprises the following steps: mixing corn starch, radix Puerariae powder and carboxymethyl cellulose, and stirring. Preferably, the corn starch is heated and fried, a small amount of water can be added in the frying process, and the corn starch is crushed into powder again after the frying is finished.
According to the method for forming the pressed ball, in the step 3), the adding amount of the binder is not more than 4 wt% of the mass of the dust removal ash, and the mass ratio of the adding amount of the iron powder to the dust removal ash is 1: (5-10). More preferably, the binder is added in an amount of not less than 2.5 wt% of the mass of the fly ash. Preferably, the addition amount of the binder is 2.5 wt% to 3.5 wt% of the mass of the dedusting ash.
According to the method for forming the pressed ball, in the step 3), the adding amount of the water is 4 wt% -7 wt% of the mass of the dedusting ash.
And 4), pre-pressing and ball pressing forming are carried out by a ball pressing machine. According to the method for forming the pressed ball, in the step 4), the ratio of the frequency of the pre-pressing motor to the frequency of the main motor is 1: (1.8-2). The pressure between the rollers of the ball press is 360-380T during ball pressing. The frequency of the main motor is 20-40 Hz during ball pressing, the ball pressing speed can be controlled, and the ratio of the feeding speed to the ball pressing speed can be adjusted by controlling the frequency of the pre-pressing motor and the frequency of the main motor, so that the ball pressing effect is ensured.
According to the dedusting ash ball pressing forming method disclosed by the application, the dedusting ash can be quickly pressed and formed by adjusting the proportion of water, iron powder and a binder and the proportion of prepressing, prepressing and main motor frequency, the balling rate is at least 90%, the dedusting ash balls with the height of 2 meters can freely fall to a cement floor once without generating fragments, the yield of the dedusting ash balls in 10 hours on one production line is 70 tons, the manpower is saved, and the processing cost is reduced.
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.
Before the present embodiments are further described, it is to be understood that the scope of the invention is not limited to the particular embodiments described below; it is also to be understood that the terminology used in the examples is for the purpose of describing particular embodiments only, and is not intended to limit the scope of the present invention. Test methods in which specific conditions are not specified in the following examples are generally carried out under conventional conditions or under conditions recommended by the respective manufacturers.
When numerical ranges are given in the examples, it is understood that both endpoints of each of the numerical ranges and any value therebetween can be selected unless the invention otherwise indicated. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. In addition to the specific methods, devices, and materials used in the examples, any methods, devices, and materials similar or equivalent to those described in the examples may be used in the practice of the invention in addition to the specific methods, devices, and materials used in the examples, in keeping with the knowledge of one skilled in the art and with the description of the invention.
In the embodiment of the application, a ball press machine is adopted for pre-pressing and ball-pressing forming, and the ball press machine is a Luoyang Central plains GY 800-380. The device is a high-pressure hydraulic ball press, the diameter of each roller is 800mm, and the maximum pressure between the rollers is 380 tons. The power of the main motor is 200kw, the model YPT355L2-8 of the main motor, the power of the pre-pressing motor is 37kw, and the model YPT225S-4 of the pre-pressing motor. The ratio of the frequency of the pre-pressing motor to the frequency of the main motor is 1: (1.8-2), the balling rate of the pressed balls can be effectively ensured, and if the ratio of the two is large, material blockage can be caused; if the ratio of the two is small, the balling rate is reduced.
The dedusting ash in the embodiment of the application is from steelmaking electric dedusting, and the TFe content in the dedusting ash is 58 wt% -62 wt%.
The particle size of the iron powder in the embodiment of the application is not more than 2 mm.
The balling rate in this application is the ratio of the amount of finished pressed balls to the amount of dust used.
Example 1
In the embodiment, the binder comprises the following raw material components in percentage by mass based on the total mass of the raw material components of the binder: 60 wt% of corn starch, 28 wt% of kudzu root powder and 12 wt% of carboxymethyl cellulose.
The dedusting ash enters a first mixer from a raw material bin, water is added for mixing, and the adding mass of the water is 5 wt% of the mass of the dedusting ash;
the dedusting ash enters a digestion bin for digestion for 20 hours;
when the dedusting ash enters a second mixer from the digestion bin, adding a binder, iron powder and water into the second mixer, wherein the mass ratio of the addition amount of the iron powder to the dedusting ash is 1:5, the addition mass of the binder is 2.5% of the mass of the dedusting ash, and the addition mass of the water is 7 wt% of the mass of the dedusting ash;
when entering a ball press machine for pressing balls, the dedusting ash mixed by adding water and a binder is pre-pressed, wherein the ratio of the frequency of a pre-pressing motor to the frequency of a main motor is 1: 1.8; the pressure between the rollers of the ball press is set to 360T when the ball is pressed, and the frequency of the main motor is 30Hz when the ball is pressed.
The pelletizing rate of the fly ash pressed balls obtained by the method in the embodiment reaches 90%, the formed fly ash balls can freely fall to a cement floor at a height of 2m at one time without generating fragments, and the yield of the fly ash balls in 10 hours in one production line is about 70 tons.
In the above-described specific embodiment of this example, the balling ratio was only about 32% when no binder was used. In the above specific embodiment of this embodiment, when iron powder is not used, the balling rate is 81%, which is acceptable, but if the balling rate is further increased, more binder needs to be added, which results in an increase in cost, and the addition of iron powder with lower cost can achieve the effect of increasing the balling rate, and the iron powder and the binder together increase the strength of the fly ash ball, which can effectively reduce fragments generated when the formed fly ash ball falls down to the cement floor at 2m height freely at one time.
Example 2
In the embodiment, the binder comprises the following raw material components in percentage by mass based on the total mass of the raw material components of the binder: 64 wt% of corn starch, 26 wt% of kudzu root powder and 10 wt% of carboxymethyl cellulose.
The dedusting ash enters a first mixer from a raw material bin, water is added for mixing, and the adding mass of the water is 6 wt% of the mass of the dedusting ash;
the dedusting ash enters a digestion bin for digestion for 24 hours;
when the dedusting ash enters a second mixer from the digestion bin, adding a binder, iron powder and water into the second mixer, wherein the mass ratio of the addition amount of the iron powder to the dedusting ash is 1:10, the addition amount of the binder is 3.5 wt% of the mass of the dedusting ash, and the addition amount of the water is 4 wt% of the mass of the dedusting ash;
when entering a ball press machine to press balls, the dedusting ash mixed by adding water and a binder is pre-pressed, wherein the ratio of the frequency of a pre-pressing motor to the frequency of a main motor is 1: 2; the pressure between the rollers of the ball press machine during ball pressing was set to 370T, and the frequency of the main motor during ball pressing was 30 Hz.
The pelletizing rate of the fly ash pressed balls obtained by the method in the embodiment reaches 90%, the formed fly ash balls can freely fall to a cement floor at a height of 2m at one time without generating fragments, and the yield of the fly ash balls in 10 hours in one production line is about 70 tons.
In the above-described specific embodiment of this example, the balling ratio was only about 35% when no binder was used.
In the above specific embodiment of this embodiment, when iron powder is not used, the balling rate is 81%, which is acceptable, but if the balling rate is further increased, more binder needs to be added, which results in an increase in cost, and the addition of iron powder with lower cost can achieve the effect of increasing the balling rate, and the iron powder and the binder together increase the strength of the fly ash ball, which can effectively reduce fragments generated when the formed fly ash ball falls down to the cement floor at 2m height freely at one time.
Example 3
In the embodiment, the binder comprises the following raw material components in percentage by mass based on the total mass of the raw material components of the binder: 65 wt% of corn starch, 25 wt% of kudzu root powder and 10 wt% of carboxymethyl cellulose.
The dedusting ash enters a first mixer from a raw material bin, water is added for mixing, and the adding mass of the water is 6 wt% of the mass of the dedusting ash;
the dedusting ash enters a digestion bin for digestion for 22 hours;
when the dedusting ash enters a second mixer from the digestion bin, adding a binder, iron powder and water into the second mixer, wherein the mass ratio of the addition amount of the iron powder to the dedusting ash is 1:8, the addition amount of the binder is 2.5 wt% of the mass of the dedusting ash, and the addition amount of the water is 5 wt% of the mass of the dedusting ash;
the dedusting ash mixed by adding water and a binder is pre-pressed when entering a ball press machine to press balls, the ratio of the frequency of a pre-pressing motor to the frequency of a main motor is 1:2, the pressure between rollers of the ball press machine during ball pressing is set to 380T, and the frequency of the main motor during ball pressing is 30 Hz.
The pelletizing rate of the fly ash pressed balls obtained by the method in the embodiment reaches 90%, the formed fly ash balls can freely fall to a cement floor at a height of 2m at one time without generating fragments, and the yield of the fly ash balls in 10 hours in one production line is about 70 tons.
In the above-described specific embodiment of this example, the balling ratio was only about 35% when no binder was used.
In the above specific embodiment of this embodiment, when iron powder is not used, the balling rate is 82%, which is acceptable, but if the balling rate is further increased, more binder needs to be added, which results in an increase in cost, and the addition of iron powder with lower cost can achieve the effect of increasing the balling rate, and the iron powder and the binder together increase the strength of the fly ash ball, which can effectively reduce fragments generated when the formed fly ash ball falls down to the cement floor at 2m height freely at one time.
Example 4
In the embodiment, the binder comprises the following raw material components in percentage by mass based on the total mass of the raw material components of the binder: 63 wt% of corn starch, 26 wt% of kudzu root powder and 11 wt% of carboxymethyl cellulose.
The dedusting ash enters a first mixer from a raw material bin, water is added for mixing, and the adding mass of the water is 6 wt% of the mass of the dedusting ash;
the dedusting ash enters a digestion bin for digestion for 24 hours;
when the dedusting ash enters a second mixer from the digestion bin, adding a binder, iron powder and water into the second mixer, wherein the mass ratio of the addition amount of the iron powder to the dedusting ash is 1:7, the addition amount of the binder is 3 wt% of the mass of the dedusting ash, and the addition amount of the water is 6 wt% of the mass of the dedusting ash;
the dedusting ash mixed by adding water and a binder is pre-pressed when entering a ball press machine to press balls, the ratio of the frequency of a pre-pressing motor to the frequency of a main motor is 1:2, the pressure between rollers of the ball press machine during ball pressing is set to be 370T, and the frequency of the main motor during ball pressing is 30 Hz.
The pelletizing rate of the fly ash pressed balls obtained by the method in the embodiment reaches 90%, the formed fly ash balls can freely fall to a cement floor at a height of 2m at one time without generating fragments, and the yield of the fly ash balls in 10 hours in one production line is about 70 tons.
In the above-described specific embodiment of this example, the balling ratio was only about 35% when no binder was used.
In the above specific embodiment of this embodiment, when iron powder is not used, the balling rate is 80%, which is acceptable, but if the balling rate is further increased, more binder needs to be added, which results in an increase in cost, and the addition of iron powder with lower cost can achieve the effect of increasing the balling rate, and the iron powder and the binder together increase the strength of the fly ash ball, which can effectively reduce the fragments generated when the formed fly ash ball falls down to the cement floor at 2m height freely at one time.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (10)
1. A ball pressing and forming method of dedusting ash is characterized by comprising the following steps:
1) the fly ash enters a first mixer from a raw material bin and is mixed by adding water;
2) entering a digestion bin for digestion;
3) the mixture enters a second mixer, and the binder, the iron powder and the water are added and mixed;
4) and (4) entering a ball press machine for prepressing, and then pressing the balls for forming.
2. The method according to claim 1, wherein the water is added in an amount of 5 wt% to 6 wt% based on the mass of the fly ash in step 1).
3. The method of claim 1, wherein the digestion time in step 2) is at least 20 hours.
4. The method for molding a pressed ball according to claim 1, wherein in the step 3), the binder comprises the following raw material components in percentage by mass based on the total mass of the raw material components of the binder:
60-65 wt% of corn starch
25 to 28 weight percent of kudzuvine root powder
10-12 wt% of carboxymethyl cellulose.
5. The method of claim 4, wherein the corn starch is heated and parched by adding a small amount of water, and pulverizing into powder after parching.
6. The method for molding a spherical object according to claim 4, wherein the binder is prepared by: mixing corn starch, radix Puerariae powder and carboxymethyl cellulose, and stirring.
7. The method according to claim 1, wherein in step 3), the addition amount of the binder is not more than 4 wt% of the mass of the fly ash, and the mass ratio of the addition amount of the iron powder to the mass of the fly ash is 1: (5-10).
8. The method according to claim 1, wherein in step 3), the water is added in an amount of 4 to 7 wt% based on the mass of the fly ash in step 3).
9. The method of claim 1, wherein in step 4), the ratio of the frequency of the pre-press motor to the frequency of the main motor is 1: (1.8-2).
10. The method of claim 1, wherein the pressure between the rollers of the ball press is 380T at maximum and the frequency of the main motor is 20-40 Hz.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010058196.5A CN111118300B (en) | 2020-01-19 | 2020-01-19 | Dust removal ball pressing forming method |
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| CN202010058196.5A CN111118300B (en) | 2020-01-19 | 2020-01-19 | Dust removal ball pressing forming method |
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| CN111118300A true CN111118300A (en) | 2020-05-08 |
| CN111118300B CN111118300B (en) | 2022-03-11 |
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Cited By (1)
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| CN111118300B (en) | 2022-03-11 |
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