CN112981095B - Iron scale ball pressing process - Google Patents
Iron scale ball pressing process Download PDFInfo
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- CN112981095B CN112981095B CN202110182642.8A CN202110182642A CN112981095B CN 112981095 B CN112981095 B CN 112981095B CN 202110182642 A CN202110182642 A CN 202110182642A CN 112981095 B CN112981095 B CN 112981095B
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- iron scale
- iron
- converter
- balls
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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
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
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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
- C22B1/248—Binding; Briquetting ; Granulating of metal scrap or alloys
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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
Abstract
The invention discloses a scale ball pressing process, which comprises the following steps: mixing iron scale, primary dedusting ash of a high-temperature converter and a binder according to a ratio; carrying out one-time extrusion forming by a pair of roller ball press machine under the pressure of 15-20 MPa to obtain a one-time forming material; carrying out secondary extrusion forming on the primary molding material by a double-roller ball press, wherein the pressure is 16-20 MPa, and outputting the molding material to a 20mm sieve by a belt for sieving to obtain a finished product of the scaly iron ball; detecting the strength of the finished product of the scaly iron ball; adding the finished iron scale balls into the converter, wherein the mass of the finished iron scale balls added into each converter is 2-7% of that of the converter raw material, so as to realize the recovery of iron. The invention prevents the scale balls from falling into powder due to low strength and being pumped into a dust removal system by producing the scale balls with higher strength (more than or equal to 1100N), thereby increasing the burden of the dust removal system; the problem that the oil-containing water in the iron scale is difficult to be pressed into the high-strength pressed ball is solved; the strength of the pressed iron scale balls is more than or equal to 1100N, and meanwhile, the proportion of the iron scale in the iron scale balls is improved, and the mass percent of the iron scale is more than 55%.
Description
Technical Field
The invention relates to the technical field of comprehensive utilization of resources, in particular to a scale ball pressing process.
Background
The iron scale is a product oxidized by contacting with oxygen at high temperature of heating, rolling or forging and the like of steel products of iron and steel enterprises. After the surface of the steel billet is washed by high-pressure water to remove scale, the iron scale flows to a advection pool or a slag settling pool along with the water, and is fished out from the advection pool by a grab bucket machine for centralized recovery. The iron scale contains about 70 percent of TFe, contains oil and water, exists in particles, cannot be added into a converter for smelting and recycling, and can be smelted after being pressed into balls.
The iron scale is mixed with normal-temperature carbon dedusting ash pressing balls, and the pressing balls are extruded by a pair-roller ball press, the iron scale proportion is about 10%, the iron scale proportion is increased, and the ball pressing strength is reduced, so the iron scale proportion is about 10% generally. Or adopting vibration forming technology, adding fly ash and solid binder to the iron scale to form cold-solidified blocks, demoulding and curing after vibration forming, wherein the iron scale blocks can only have strength after curing for a period of time.
Disclosure of Invention
The invention aims to provide a high-strength iron scale ball pressing process.
In order to achieve the purpose, the specific technical scheme of the iron scale ball pressing process is as follows:
a scale ball pressing process comprises the following steps:
mixing iron scale, primary dedusting ash of a high-temperature converter and a binder according to a ratio;
secondly, carrying out one-time extrusion forming by a pair of roller ball press machine under the pressure of 15-20 MPa to obtain a one-time forming material;
thirdly, carrying out secondary extrusion forming on the primary forming material by a double-roller ball press, wherein the pressure is 16-20 MPa, and outputting the formed material to a 20mm sieve for sieving through a belt to obtain a finished product of the scale ball;
step four, detecting the strength of the finished product of the scale ball;
and step five, adding the finished iron scale balls into the converter, wherein the added finished iron scale balls in each converter account for 2-7% of the mass of the converter raw materials so as to realize the recovery of iron.
Further, in the first step, the iron scale, the primary ash of the high-temperature converter and the binder are uniformly mixed according to a certain proportion, and the mass percentage is as follows: the total mass of the iron scale and the primary ash of the high-temperature converter is 100 percent, wherein the primary ash of the high-temperature converter is less than 45 percent, the primary ash temperature of the high-temperature converter is greater than 70 percent; the additional adhesive is 3-8% of the total mass of the iron scale and the primary ash of the high-temperature converter.
Further, 2800-3200 kg of iron scale and 1900-2100 kg of primary high-temperature converter dust are mixed together, 190-210 kg of binder is added, and the temperature of the primary high-temperature converter dust is 86-90 ℃.
Further, in the fourth step, at least 10 finished iron scale balls are randomly extracted to test the compressive strength, and the strength of the finished iron scale balls is detected.
Further, in the fifth step, finished iron scale balls with the compressive strength of more than or equal to 1100N are added into a converter for smelting carbon steel by 180 tons through a high-level storage bin, and 5 tons of finished iron scale balls are added into each converter, so that the recovery of iron is realized, and the iron yield is 98%.
Further, in the fifth step, finished iron scale balls with the compressive strength of more than or equal to 1100N are added into a converter for smelting carbon steel by 180 tons through a high-level storage bin, and 6 tons of finished iron scale balls are added into each converter, so that the recovery of iron is realized, and the iron yield is 97 percent.
The iron scale ball pressing process has the advantages that:
1) The invention solves the problem that the oil-containing water in the iron scale is difficult to be pressed into the pressed ball with higher strength, and the pressed iron scale ball has higher strength (more than or equal to 1100N). The invention mainly adopts a pair roller ball press to press iron scale balls, then the iron scale balls are transported to a high-level bin through a pit and a belt, the iron scale balls are added into a converter through the high-level bin, the height from the high-level bin to a converter mouth of the converter is about 30 meters, and the iron scale balls are transported through the pit and fall down from the high-level bin.
2) The proportion of the iron scale in the iron scale balls is improved, and the mass percent of the iron scale is more than 55%.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
FIG. 1 is a process flow diagram of the iron scale ball pressing process of the present invention.
Detailed Description
Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
The invention discloses a process for pressing iron scale balls, which comprises the steps of uniformly mixing iron scale, primary ash of a high-temperature converter and a binder according to a certain proportion, then pressing the mixture into balls twice by a pair of roll ball presses, and adding the iron scale balls into the converter for smelting and recycling, as shown in figure 1. The method comprises the following steps:
mixing iron scale, primary dedusting ash of a high-temperature converter and a binder according to a ratio.
Specifically, iron scale, primary ash of a high-temperature converter and a binder are uniformly mixed according to a certain proportion, and the mass percentage is as follows: the iron scale is more than 55 percent, the primary ash of the high-temperature converter is less than 45 percent, and the primary ash temperature of the high-temperature converter is more than 70 ℃. The total mass of the iron scale and the primary ash of the high-temperature converter is 100 percent. The additional adhesive is 3-8% of the total mass of the iron scale and the primary ash of the high-temperature converter.
Wherein 2800-3200 kg (preferably 3000 kg) of iron scale and 1900-2100 kg (preferably 2000 kg) of high-temperature converter primary ash can be mixed together, 190-210 kg (preferably 200 kg) of binder is added, the temperature of the high-temperature converter primary dedusting ash is 86-90 ℃ (preferably 88 ℃), and the mixture is stirred and mixed uniformly by a powerful mixer.
And step two, carrying out one-time extrusion forming by a pair of roller ball press under the pressure of 15-20 MPa to obtain a one-time forming material.
And step three, carrying out secondary extrusion molding on the primary molding material by a double-roller ball press, wherein the pressure is 16-20 MPa, and outputting the molding material to a 20mm sieve by a belt for sieving to obtain a finished product of the iron scale ball.
And step four, detecting the strength of the finished product of the scale ball.
Specifically, at least 10 finished iron scale balls are randomly extracted to test the compressive strength, and the strength of the finished iron scale balls is detected to obtain that the average compressive strength of the finished iron scale balls is more than or equal to 1100N/ball.
And step five, adding the finished iron scale balls into the converter, wherein the added finished iron scale balls in each converter account for 2-7% of the mass of the converter raw materials so as to realize the recovery of iron.
Specifically, finished iron scale balls with the compressive strength of more than or equal to 1100N are added into a 180-ton converter through a high-level bunker, 5 tons of iron scale balls are added into each converter, the iron scale balls serve as a cooling agent in the converter on the one hand, and on the other hand, reducing agents in converter raw materials are used for reducing iron oxides in the iron scale balls to realize iron recovery, and the iron yield is 98% through calculation.
The invention is illustrated by, but not limited to, the following two examples.
Example 1:
firstly, weighing iron scale, high-temperature converter primary dedusting ash and a binder according to the proportion: 3000kg of iron scale, 2000kg of high-temperature converter primary ash and 200kg of binder. The temperature of the once dust removal ash of the high-temperature converter is 88 ℃, and the mixture is stirred and mixed by a powerful mixer.
And step two, carrying out one-time extrusion forming by a pair of roller ball press machine under the pressure of 15MPa to obtain a one-time forming material.
And step three, carrying out secondary extrusion forming on the primary forming material by a double-roller ball press, wherein the pressure is 19MPa, and outputting to a 20mm sieve through a belt for sieving to obtain a finished product of the scale ball.
And step four, detecting the strength of the finished product of the scale balls, randomly extracting 10 finished product of the scale balls to test the compressive strength, and obtaining that the average compressive strength of the finished product of the scale balls is more than or equal to 1100N/ball, which is shown in table 1.
TABLE 1 compressive Strength
| Serial number | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | Mean value of |
| N/N is | 1200 | 1100 | 1120 | 1140 | 1170 | 1260 | 1160 | 1130 | 1220 | 1100 | 1160 |
And step five, adding finished iron scale balls into 180 tons of converter furnaces for smelting carbon steel through an overhead bunker, adding 5 tons of finished iron scale balls into each converter, wherein the iron scale balls serve as a cooling agent in the converter on one hand, and reducing iron oxides in the iron scale balls by using a reducing agent in converter raw materials on the other hand to realize iron recovery, and the iron yield is 98% through calculation.
Example 2:
firstly, weighing iron scale, high-temperature converter primary dedusting ash and liquid organic binder according to the proportion: 4000kg of iron scale and 1500kg of high-temperature converter primary dedusting ash. The temperature of the once dust removal ash of the high-temperature converter is 93 ℃, and 270kg of binder is stirred and mixed evenly by a powerful mixer.
And step two, carrying out one-time extrusion forming by a pair of roller ball press machine under the pressure of 17MPa to obtain a one-time forming material.
And step three, carrying out secondary extrusion forming on the primary forming material by a double-roller ball press, wherein the pressure is 20MPa, and outputting to a 20mm sieve through a belt for sieving to obtain a finished product of the scale ball.
And step four, detecting the strength of the finished product of the iron scale balls, randomly extracting 10 finished product of the iron scale balls to test the compressive strength, and obtaining that the average compressive strength of the finished product of the iron scale balls is more than or equal to 1100N/ball, which is shown in table 2.
TABLE 2 compressive Strength
| Serial number | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | Mean value of |
| N/N | 1400 | 1300 | 1220 | 1140 | 1170 | 1260 | 1160 | 1130 | 1220 | 1320 | 1232 |
And step five, adding the finished iron scale balls into 180 tons of converter furnaces for smelting carbon steel through an overhead bunker, adding 6 tons of finished iron scale balls into each converter, wherein the finished iron scale balls serve as a cooling agent in the converter on the one hand, and reducing iron oxides in the iron scale balls by using a reducing agent in converter raw materials on the other hand to realize iron recovery, and the iron yield is 97% by calculation.
Claims (5)
1. The iron scale ball pressing process is characterized by comprising the following steps of:
mixing iron scale, primary dedusting ash of a high-temperature converter and a binder according to a ratio;
step two, carrying out primary extrusion forming by a pair of roll ball press under the pressure of 15 to 20MPa to obtain a primary forming material;
thirdly, carrying out secondary extrusion forming on the primary forming material by a double-roller ball press, wherein the pressure is 16-20MPa, and outputting the forming material to a 20mm sieve through a belt to be sieved to obtain a finished product of the scaly iron ball;
step four, detecting the strength of the finished product of the scale ball;
step five, adding the finished iron scale balls into the converter, wherein the mass of the finished iron scale balls added into each converter is 2-7% of the mass of the raw materials of the converter, so as to realize the recovery of iron;
in the first step, the iron scale, the primary ash of the high-temperature converter and the binder are uniformly mixed according to the mass percentage: the total mass of the iron scale and the primary ash of the high-temperature converter is 100 percent, wherein the primary ash of the high-temperature converter is less than 45 percent, the primary ash temperature of the high-temperature converter is greater than 70 percent; the external binder accounts for 3 to 8 percent of the total mass of the iron scale and the primary ash of the high-temperature converter.
2. The iron scale pelletizing process according to claim 1, wherein 2800 to 3200kg of iron scale and 1900 to 2100kg of high temperature converter primary dust are mixed together, 190 to 210kg of binder is added externally, and the temperature of high temperature converter primary dust removal is 86 to 90 ℃.
3. The process for pressing iron scale balls according to claim 2, wherein in the fourth step, at least 10 finished iron scale balls are randomly extracted to test the compressive strength, and the strength of the finished iron scale balls is tested.
4. The iron scale ball pressing process according to claim 1 or 3, wherein in the fifth step, finished iron scale balls with the compressive strength of more than or equal to 1100N are added into a converter for smelting carbon steel by 180 tons through an overhead bunker, and 5 tons of finished iron scale balls are added into each converter to realize the recovery of iron, wherein the iron yield is 98%.
5. The iron scale ball pressing process according to claim 1 or 3, wherein in the fifth step, finished iron scale balls with the compressive strength of more than or equal to 1100N are added into a converter for smelting carbon steel by 180 tons through an overhead bunker, and 6 tons of finished iron scale balls are added into each converter, so that the recovery of iron is realized, and the iron yield is 97%.
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| CN101109027A (en) * | 2007-08-24 | 2008-01-23 | 邯郸钢铁股份有限公司 | Method for producing ball iron with iron scale |
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| CN101109027A (en) * | 2007-08-24 | 2008-01-23 | 邯郸钢铁股份有限公司 | Method for producing ball iron with iron scale |
| CN101519722A (en) * | 2009-03-25 | 2009-09-02 | 韶关市曲江盛大工业物资有限公司 | Method for utilizing iron containing metallurgical dust |
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| CN104402097A (en) * | 2014-10-31 | 2015-03-11 | 武汉钢铁(集团)公司 | Blast furnace dust recycling utilization method |
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