CN112657627A - Zero-emission comprehensive utilization method for metallurgical slag - Google Patents
Zero-emission comprehensive utilization method for metallurgical slag Download PDFInfo
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- CN112657627A CN112657627A CN202011610707.6A CN202011610707A CN112657627A CN 112657627 A CN112657627 A CN 112657627A CN 202011610707 A CN202011610707 A CN 202011610707A CN 112657627 A CN112657627 A CN 112657627A
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Abstract
The invention discloses a zero-emission comprehensive utilization method of metallurgical slag, which comprises the steps of firstly dividing materials into two groups of 0-250 mm and more than 250mm and two groups of 0-30 mm and 30-250 mm, recycling 0-30 mm steel slag through a roller magnetic separator and passing through a 5mm sieve to obtain two groups of final separation blocks of 0-5 mm and 5-30 mm; crushing and electromagnetic absorbing the steel slag with the thickness of more than 250mm to obtain the steel slag with the thickness of more than 250mm and tailings; the method comprises the following steps of (1) crushing 30-250 mm steel slag in a rod mill, recycling 30-40 mm undersize in a steel slag magnetic drum concentration machine, screening concentrate by a 5mm vibrating screen, and carrying out magnetic separation on 0-5 mm full iron grade 60%; and carrying out electromagnetic suction on the 40-250 mm steel slag on the sieve to obtain 40-250 mm groups. According to the method, the steel slag is respectively sunned into five groups of 0-5 mm, 5-40 mm, 40-250 mm, 250mm and tailings according to the screening size, so that the problems of poor recovery rate and purification effect of magnetic separation powder with the total iron grade of 60% and 40% of the total iron grade of the steel slag in the domestic common recovery process are solved, the steel slag with different particle sizes is respectively treated and utilized, and the economic value of recovery enterprises is improved.
Description
Technical Field
The invention relates to the field of metallurgy, in particular to a zero-emission comprehensive utilization method of metallurgical slag.
Background
A large amount of metallurgical slag is produced during the steel smelting process, and the amount of the metallurgical slag is about 15-20% of the steel yield. Because the metallurgical slag has complex and variable components, the utilization rate is not high all the time. For a long time, metallurgical slag has been considered as the waste slag produced in steel making.
The treatment process and effect of domestic large and medium sized metallurgical slag treatment plants still stay at the level 20 years ago, and the sorted products cannot meet the requirement of comprehensive utilization, thus causing resource waste and environmental pollution. The recycling of the metallurgical slag plays an important role in the economic activities of material recycling enterprises, and is an important component of the economic benefits of the enterprises. The well-done recycling work of the metallurgical slag has important significance for supporting industrial and agricultural production, creating social wealth, excavating material potential, promoting social conservation, protecting environmental sanitation, preventing social public nuisance and the like. The metallurgical slag can be widely used as metallurgical raw materials, building materials, cement production, agricultural fertilizers and the like. Therefore, it is the responsibility and urgent task of the steel industry to improve the comprehensive utilization rate of the metallurgical slag, and therefore, we propose a zero-emission comprehensive utilization method of the metallurgical slag to solve the above problems.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a zero-emission comprehensive utilization method of metallurgical slag, and by adopting the crushing, screening and magnetic separation recovery process, slag steel with the total iron grade of more than 90 percent and magnetic separation powder with the total iron grade of 60 percent can be obtained, and the content of metallic iron in the tailings grade is less than 1 percent, so that the problems in the background art are solved.
The technical purpose of the invention is realized by the following technical scheme:
a zero-emission comprehensive utilization method of metallurgical slag comprises the following processing procedures:
the method comprises the following steps: firstly, screening materials through a 250mm sieve, dividing the materials into two groups of 0-250 mm and more than 250mm, screening 0-250 mm through a 30mm sieve, dividing the materials into two groups of 0-30 mm and 30-250 mm, recycling 0-30 mm steel slag through a roller magnetic separator, screening through a 5mm sieve, grinding concentrate through a rod mill, wherein the concentrate grade is more than 45%, the content of metal iron particles of tailings larger than 1mm is less than 1%, and obtaining two groups of final sorting blocks of 0-5 mm and 5-30 mm;
step two: crushing and electromagnetic absorbing the steel slag with the thickness of more than 250mm to obtain the steel slag with the thickness of more than 250mm and tailings;
step three: the method comprises the following steps of (1) crushing 30-250 mm steel slag in a rod mill, screening the crushed material through a 40mm vibrating screen, sorting oversize products through a belt magnetic separator to obtain slag steel with the total iron grade of 85%, recycling undersize products 30-40 mm in a steel slag magnetic drum concentration machine, grinding concentrate in the rod mill, feeding the concentrate into a 5mm sieve, and screening the concentrate through the 5mm vibrating screen to obtain grain steel with the total iron grade of 90% and magnetic separation powder with the total iron grade of 60% and the total iron grade of 0-5 mm;
step four: and carrying out electromagnetic suction on the 40-250 mm steel slag on the sieve to obtain 40-250 mm groups.
Further, the barrel and the lining plate of the rod mill are improved: the thickness of the cylinder body is increased, the crushing effect is improved, and the waveform of the lining plate is changed.
Furthermore, the process position of the rod mill is used for grinding the fine material of the steel slag magnetic drum fine separator, and the diameter selection, the proportion selection, the retention time of the material in the equipment, the treatment capacity and the like of a medium rod in the rod mill need to be controlled according to the iron-containing requirement.
Further, the steel slag magnetic drum classificator sorts the ground finished products, and carries out process control on the magnetic field, the feeding height, the rotating speed and the material distribution position of the classificator.
Further, the steel slag magnetic drum classificator comprises: the side feeding mode is adopted, the speed-adjustable roller structure is adopted, and the material grade and the recovery rate are improved.
In conclusion, the invention has the following beneficial effects:
the method can obtain the slag steel with the total iron grade of more than 90 percent and the magnetic separation powder with the total iron grade of 60 percent, the steel slag is respectively sunned into five groups of 0-5 mm, 5-40 mm, 40-250 mm, 250mm and tailings according to the screening size, the content of metallic iron in the tailings grade is less than 1 percent, the process solves the problems of poor recovery rate and purification effect of the magnetic separation powder with the total iron grade of 60 percent and the total iron grade of 40 percent of the slag steel in the domestic common recovery process, and the steel slag with different grain sizes is respectively treated and utilized according to the screening size, so the economic value of recovery enterprises is improved.
Drawings
FIG. 1 is a flow chart of the zero-emission comprehensive utilization method of metallurgical slag.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
In which like parts are designated by like reference numerals. It should be noted that the terms "front," "back," "left," "right," "upper" and "lower" used in the following description refer to directions in the drawings, and the terms "bottom" and "top," "inner" and "outer" refer to directions toward and away from, respectively, the geometric center of a particular component.
Referring to fig. 1, a zero-emission comprehensive utilization method of metallurgical slag in a preferred embodiment of the invention includes the following processing steps:
the method comprises the following steps: firstly, screening materials through a 250mm sieve, dividing the materials into two groups of 0-250 mm and more than 250mm, screening 0-250 mm through a 30mm sieve, dividing the materials into two groups of 0-30 mm and 30-250 mm, recycling 0-30 mm steel slag through a roller magnetic separator, screening through a 5mm sieve, grinding concentrate through a rod mill, wherein the concentrate grade is more than 45%, the content of metal iron particles of tailings larger than 1mm is less than 1%, and obtaining two groups of final sorting blocks of 0-5 mm and 5-30 mm;
step two: crushing and electromagnetic absorbing the steel slag with the thickness of more than 250mm to obtain the steel slag with the thickness of more than 250mm and tailings;
step three: the method comprises the following steps of (1) crushing 30-250 mm steel slag in a rod mill, screening the crushed material through a 40mm vibrating screen, sorting oversize products through a belt magnetic separator to obtain slag steel with the total iron grade of 85%, recycling undersize products 30-40 mm in a steel slag magnetic drum concentration machine, grinding concentrate in the rod mill, feeding the concentrate into a 5mm sieve, and screening the concentrate through the 5mm vibrating screen to obtain grain steel with the total iron grade of 90% and magnetic separation powder with the total iron grade of 60% and the total iron grade of 0-5 mm;
step four: and carrying out electromagnetic suction on the 40-250 mm steel slag on the sieve to obtain 40-250 mm groups.
The improvement of the cylinder and the lining plate of the rod mill: the thickness of the cylinder body is increased, the crushing effect is improved, the waveform of the lining plate is changed, ore grinding and crushing can be more effectively realized, and the waveform of the lining plate is changed, so that ore grinding and crushing can be more effectively realized;
the steel slag magnetic drum classificator comprises: a side feeding mode is adopted, the speed-adjustable roller structure is adopted, and the material grade and the recovery rate are improved;
different equipment and processing schemes are adopted for materials with different particle sizes;
and (3) purification: the technological position of the rod mill is controlled to grind the fine material of the steel slag magnetic drum fine separator, and the diameter selection, the proportion selection, the retention time of the material in the equipment, the treatment capacity and the like of a medium rod in the rod mill need to be controlled according to the iron-containing requirement; the steel slag magnetic drum classificator classifies the ground finished products, and the magnetic field, the feeding height, the rotating speed and the material distribution position of the classificator need process control; the choice of equipment requires process control: how to coordinate the working state and working principle of different devices to achieve the final purpose.
The specific implementation process comprises the following steps: the method can obtain the slag steel with the total iron grade of more than 90 percent and the magnetic separation powder with the total iron grade of 60 percent, the steel slag is respectively sunned into five groups of 0-5 mm, 5-40 mm, 40-250 mm, 250mm and tailings according to the screening size, the content of metallic iron in the tailings grade is less than 1 percent, the process solves the problems of poor recovery rate and purification effect of the magnetic separation powder with the total iron grade of 60 percent and the total iron grade of 40 percent of the slag steel in the domestic common recovery process, and the steel slag with different grain sizes is respectively treated and utilized according to the screening size, so the economic value of recovery enterprises is improved.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (5)
1. A zero-emission comprehensive utilization method of metallurgical slag is characterized by comprising the following steps:
the method comprises the following steps: firstly, screening materials through a 250mm sieve, dividing the materials into two groups of 0-250 mm and more than 250mm, screening 0-250 mm through a 30mm sieve, dividing the materials into two groups of 0-30 mm and 30-250 mm, recycling 0-30 mm steel slag through a roller magnetic separator, screening through a 5mm sieve, grinding concentrate through a rod mill, wherein the concentrate grade is more than 45%, the content of metal iron particles of tailings larger than 1mm is less than 1%, and obtaining two groups of final sorting blocks of 0-5 mm and 5-30 mm;
step two: crushing and electromagnetic absorbing the steel slag with the thickness of more than 250mm to obtain the steel slag with the thickness of more than 250mm and tailings;
step three: the method comprises the following steps of (1) crushing 30-250 mm steel slag in a rod mill, screening the crushed material through a 40mm vibrating screen, sorting oversize products through a belt magnetic separator to obtain slag steel with the total iron grade of 85%, recycling undersize products 30-40 mm in a steel slag magnetic drum concentration machine, grinding concentrate in the rod mill, feeding the concentrate into a 5mm sieve, and screening the concentrate through the 5mm vibrating screen to obtain grain steel with the total iron grade of 90% and magnetic separation powder with the total iron grade of 60% and the total iron grade of 0-5 mm;
step four: and carrying out electromagnetic suction on the 40-250 mm steel slag on the sieve to obtain 40-250 mm groups.
2. The metallurgical slag zero-emission comprehensive utilization method according to claim 1, characterized in that: the improvement of the cylinder and the lining plate of the rod mill: the thickness of the cylinder body is increased, the crushing effect is improved, and the waveform of the lining plate is changed.
3. The metallurgical slag zero-emission comprehensive utilization method according to claim 2, characterized in that: the process position of the rod mill is used for grinding the fine material of the steel slag magnetic drum fine concentrator, and the diameter selection, the proportion selection, the retention time of the material in the equipment, the treatment capacity and the like of a medium rod in the rod mill need to be controlled according to the iron-containing requirement.
4. The metallurgical slag zero-emission comprehensive utilization method according to claim 1, characterized in that: the steel slag magnetic drum classificator sorts the ground finished products, and carries out process control on the magnetic field, the feeding height, the rotating speed and the material distribution position of the classificator.
5. The metallurgical slag zero-emission comprehensive utilization method according to claim 2, characterized in that: the steel slag magnetic drum classificator comprises: the side feeding mode is adopted, the speed-adjustable roller structure is adopted, and the material grade and the recovery rate are improved.
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US20110072935A1 (en) * | 2006-12-21 | 2011-03-31 | Gillis James M | Processing of steel making slag |
| CN102534068A (en) * | 2012-01-30 | 2012-07-04 | 山西太钢不锈钢股份有限公司 | Method for reusing common steel slag |
| CN103433125A (en) * | 2013-03-12 | 2013-12-11 | 沈阳隆基电磁科技股份有限公司 | Metallurgical slag zero-emission comprehensive utilization technology |
| CN204974063U (en) * | 2015-08-11 | 2016-01-20 | 内蒙古中天宏远再制造股份公司 | Stick mill liners |
| CN108187880A (en) * | 2018-01-15 | 2018-06-22 | 南京芬钢环保科技有限公司 | A kind of slag advanced treatment process |
| CN207857025U (en) * | 2017-10-31 | 2018-09-14 | 武汉探矿机械厂 | A kind of safety device of rod mill |
| CN208906099U (en) * | 2018-09-20 | 2019-05-28 | 靖江市旭日电力机械制造有限公司 | A kind of improvement structure of rod milling machine drum body steel lining seal assembly |
| CN211838234U (en) * | 2020-03-23 | 2020-11-03 | 紫金矿业集团股份有限公司 | Ball mill lining plate suitable for copper smelting slag |
-
2020
- 2020-12-29 CN CN202011610707.6A patent/CN112657627A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110072935A1 (en) * | 2006-12-21 | 2011-03-31 | Gillis James M | Processing of steel making slag |
| CN102534068A (en) * | 2012-01-30 | 2012-07-04 | 山西太钢不锈钢股份有限公司 | Method for reusing common steel slag |
| CN103433125A (en) * | 2013-03-12 | 2013-12-11 | 沈阳隆基电磁科技股份有限公司 | Metallurgical slag zero-emission comprehensive utilization technology |
| CN204974063U (en) * | 2015-08-11 | 2016-01-20 | 内蒙古中天宏远再制造股份公司 | Stick mill liners |
| CN207857025U (en) * | 2017-10-31 | 2018-09-14 | 武汉探矿机械厂 | A kind of safety device of rod mill |
| CN108187880A (en) * | 2018-01-15 | 2018-06-22 | 南京芬钢环保科技有限公司 | A kind of slag advanced treatment process |
| CN208906099U (en) * | 2018-09-20 | 2019-05-28 | 靖江市旭日电力机械制造有限公司 | A kind of improvement structure of rod milling machine drum body steel lining seal assembly |
| CN211838234U (en) * | 2020-03-23 | 2020-11-03 | 紫金矿业集团股份有限公司 | Ball mill lining plate suitable for copper smelting slag |
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