CN113981163A - Method for recovering metallic iron from carbon-containing converter steel slag - Google Patents
Method for recovering metallic iron from carbon-containing converter steel slag Download PDFInfo
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- CN113981163A CN113981163A CN202111410051.8A CN202111410051A CN113981163A CN 113981163 A CN113981163 A CN 113981163A CN 202111410051 A CN202111410051 A CN 202111410051A CN 113981163 A CN113981163 A CN 113981163A
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- iron
- steel slag
- converter steel
- slag
- magnetic
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B11/00—Making pig-iron other than in blast furnaces
- C21B11/10—Making pig-iron other than in blast furnaces in electric furnaces
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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
- C22B1/005—Preliminary treatment of scrap
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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
- C21C2200/00—Recycling of waste material
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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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- 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 relates to a method for recovering metallic iron resources from waste residues in the steel industry, in particular to a method for recovering metallic iron from carbon-containing converter steel slag. The iron grade in the converter steel slag can be enriched from 20-22% to more than 80% through the process flows of screening, primary crushing, primary magnetic separation, smelting, secondary crushing and secondary magnetic separation. The method has the advantages of high recovery rate and grade of metallic iron, simple process flow, convenient operation, low production cost, suitability for treating various converter steel slags and the like.
Description
Technical Field
The invention relates to a method for recovering metallic iron resources from waste residues in the steel industry, in particular to a method for recovering metallic iron from carbon-containing converter steel slag.
Background
The steel slag as a derivative of the steel-making process flow increases with the increase of the steel yield, and the slag amount generated by each ton of steel is about 10-15% of the steel amount. The utilization rate of steel slag in China is only about 25 percent, and the domestic stacking amount reaches hundreds of millions of tons. The steel slag includes converter steel slag, electric furnace steel slag and open hearth steel slag, most of the steel slag is converter steel slag, the iron grade of the converter steel slag of the wine steel group is as high as 20-22%, the annual production amount is about 56 ten thousand tons, most of the steel slag is piled up in a metallurgical slag factory, the recycling efficiency is low, only a small amount of large granular iron is used for the sintering process and the steelmaking process, and the steel slag is not comprehensively utilized at present.
Disclosure of Invention
The invention aims to provide a method for recovering metallic iron from carbon-containing converter steel slag so as to realize secondary utilization of iron resources.
In order to achieve the purpose, the invention adopts the following scheme:
a method for recovering metallic iron from carbon-containing converter steel slag comprises the following steps:
s1, screening, namely screening and removing large iron slag in the converter steel slag by using an iron remover;
s2, primary crushing, namely crushing the converter steel slag from which the large iron slag is removed in the step S1 by using a crusher to ensure that the granularity of the crushed converter steel slag is less than 10 mm;
s3: performing primary magnetic separation, namely performing dry magnetic separation and tailing discarding on the converter steel slag with the granularity of less than 10mm obtained in the step S2 to obtain magnetic coarse slag;
s4, smelting, namely adding the magnetic coarse slag obtained in the step S3 into a high-frequency induction heating electric furnace for smelting, and then placing a smelting product into air for cooling;
s5, secondary crushing, namely adding the smelting product obtained in the step S4 into a jaw crusher for secondary crushing, so that the granularity of the crushed smelting product is 20-25 mm;
and S6, secondary magnetic separation, namely, performing dry magnetic separation and tailing discarding on the smelting product with the granularity of 20-25 mm obtained in the step S5 to obtain magnetic iron ore concentrate.
Further, the iron grade of the S1 converter steel slag is 20-22%.
Further, the iron grade of the magnetic coarse slag in the S2 is 42-44%.
Further, the smelting time in the S3 is 60-150 min, and the smelting temperature is 1600-1720 ℃.
Further, the iron grade of the magnetic iron concentrate in the S6 is more than or equal to 80%.
Further, the magnetic induction intensity of the dry magnetic separation in S3 is 0.13T.
Further, the magnetic induction intensity of the dry magnetic separation in S6 is 0.13T.
The invention has the following beneficial effects:
1. the magnetic coarse slag with the iron grade of 42-44% after crushing and magnetic separation is placed in a high-frequency induction heating electric furnace for high-temperature smelting, so that the high-efficiency separation of iron and slag can be realized;
2. the magnetic iron concentrate obtained by the converter steel slag through a high-frequency induction heating electric furnace has the iron grade of over 80.0 percent and the granularity of between 20 and 25mm, and is beneficial to directly recycling the steel slag due to high iron grade and large granularity;
3. compared with the traditional process method, the method has the advantages that the iron grade of the obtained product is higher, the cutting process flow is simpler, the operation is more convenient, and the economical efficiency and the practicability are better.
Drawings
FIG. 1 is a process flow diagram of the present invention.
Detailed Description
The invention is further explained below with reference to the drawings and the detailed description.
Example 1
S1: screening, taking 25kg of converter steel slag with wine steel grade of 21.5%, separating large iron slag by using an iron remover to obtain 24.78kg of converter steel slag with large iron slag removed, wherein the granularity of the large iron slag is more than or equal to 100mm, and the separated large iron slag has high iron grade content and can be directly recycled as concentrate.
S2, primary crushing, namely crushing the converter steel slag from which the large iron slag is removed in the step S1 by using a jaw crusher to ensure that the granularity of the crushed converter steel slag is less than 10 mm;
s3: performing primary magnetic separation, namely performing dry magnetic separation on the converter steel slag with the granularity of less than 10mm obtained in the step S2 by using a belt type permanent magnet roller to obtain 5.45kg of magnetic coarse slag and 19.33kg of weakly magnetic tailings; wherein the magnetic induction intensity on the surface of the belt type permanent magnetic roller is 0.13T, and the iron grade of the obtained magnetic coarse slag is 42.5 percent.
And S4, smelting, namely weighing 1kg of the magnetic coarse slag obtained in the step S3, placing the magnetic coarse slag in a graphite crucible with the diameter of 25mm, smelting by adopting a GP-160 type high-frequency induction heating electric furnace, wherein the smelting frequency is 2000HZ-2200HZ, the smelting time is 120min, the smelting temperature is 1700 ℃, and cooling the furnace body by adopting a circulating cooling water mode. After the magnetic coarse slag is melted in a graphite crucible in a high-frequency induction heating electric furnace, molten iron floats upwards on the upper part of the graphite crucible, and slag liquid is deposited at the bottom of the graphite crucible, so that the effective separation of slag and iron is achieved. And after the smelting is finished, putting the crucible in the air for natural cooling.
And S5, secondary crushing, namely adding the smelting product obtained in the step S4 into a jaw crusher for secondary crushing, so that the granularity of the crushed smelting product is 20-25 mm. Aims to separate slag powder through repeated extrusion and crushing so as to obtain iron ore concentrate with higher iron grade.
And S6, secondary magnetic separation, namely performing dry magnetic separation on the smelting product with the granularity of 20-25 mm obtained in the step S5 to obtain 318g of magnetic iron concentrate and 682g of weakly magnetic tailings. The magnetic induction intensity on the surface of the belt type permanent magnet roller is 0.13T, the iron grade of the magnetic iron concentrate is 81.5% through analysis and determination, and the magnetic iron concentrate can be directly recycled.
The iron grade content of the weakly magnetic tailings separated in the process is low, and the weakly magnetic tailings can be combined and treated to be used as a highway infrastructure material, so that the aim of zero stockpiling of solid wastes is fulfilled.
Example 2
S1: and (3) screening, namely taking 30kg of converter steel slag with wine steel grade of 22%, and separating large iron slag by using an iron remover to obtain 29kg of converter steel slag with large iron slag removed, wherein the granularity of the large iron slag is more than or equal to 100mm, and the separated large iron slag has high iron grade content and can be directly recycled as concentrate.
S2, primary crushing, namely crushing the converter steel slag from which the large iron slag is removed in the step S1 by using a jaw crusher to ensure that the granularity of the crushed converter steel slag is less than 10 mm;
s3: performing primary magnetic separation, namely performing dry magnetic separation on the converter steel slag with the granularity of less than 10mm obtained in the step S2 by using a belt type permanent magnet roller to obtain 6.38kg of magnetic coarse slag and 22.62kg of weakly magnetic tailings; wherein the magnetic induction intensity on the surface of the belt type permanent magnet roller is 0.13T, and the grade of the magnetic coarse slag iron obtained by analysis and determination is 43.2%.
And S4, smelting, namely weighing 900g of the magnetic coarse slag obtained in the step S3, placing the magnetic coarse slag in a graphite crucible with the diameter of 25mm, smelting by adopting a GP-160 type high-frequency induction heating electric furnace, wherein the smelting frequency is 2000HZ-2200HZ, the smelting time is 100min, the smelting temperature is 1690 ℃, and cooling the furnace body by adopting a circulating cooling water mode. After the magnetic coarse slag is melted in a graphite crucible in a high-frequency induction heating electric furnace, molten iron floats upwards on the upper part of the graphite crucible, and slag liquid is deposited at the bottom of the graphite crucible, so that the effective separation of slag and iron is achieved. And after the smelting is finished, putting the crucible in the air for natural cooling.
And S5, secondary crushing, namely adding the smelting product obtained in the step S4 into a jaw crusher for secondary crushing, so that the granularity of the crushed smelting product is 20-25 mm. Aims to separate slag powder through repeated extrusion and crushing so as to obtain iron ore concentrate with higher iron grade
And S6, secondary magnetic separation, namely adding the smelting product with the granularity of 20-25 mm obtained in the step S5 into a belt type permanent magnet roller for dry magnetic separation to obtain 286.2g of magnetic iron concentrate and 613.8g of weakly magnetic tailings. The magnetic induction intensity of the surface of the belt type permanent magnet roller is 0.13T, the iron grade of the obtained magnetic iron concentrate is 80.7% through analysis and determination, and the magnetic iron concentrate can be directly recycled.
The iron grade content of the weakly magnetic tailings separated in the process is low, and the weakly magnetic tailings can be combined and treated to be used as a highway infrastructure material, so that the aim of zero stockpiling of solid wastes is fulfilled.
Claims (7)
1. A method for recovering metallic iron from carbon-containing converter steel slag is characterized by comprising the following steps: the method comprises the following steps:
s1, screening, namely screening and removing large iron slag in the converter steel slag by using an iron remover;
s2, primary crushing, namely crushing the converter steel slag from which the large iron slag is removed in the step S1 by using a crusher to ensure that the granularity of the crushed converter steel slag is less than 10 mm;
s3: performing primary magnetic separation, namely performing dry magnetic separation and tailing discarding on the converter steel slag with the granularity of less than 10mm obtained in the step S2 to obtain magnetic coarse slag;
s4, smelting, namely adding the magnetic coarse slag obtained in the step S3 into a high-frequency induction heating electric furnace for smelting, and then placing a smelting product into air for cooling;
s5, secondary crushing, namely adding the smelting product obtained in the step S4 into a jaw crusher for secondary crushing, so that the granularity of the crushed smelting product is 20-25 mm;
s6: and (4) performing secondary magnetic separation, namely performing dry magnetic separation and tailing discarding on the smelting product with the granularity of 20-25 mm obtained in the step S5 to obtain magnetic iron ore concentrate.
2. The method for recovering metallic iron from carbon-containing converter steel slag according to claim 1, wherein the method comprises the following steps: the iron grade of the S1 transfer furnace steel slag is 20-22%.
3. The method for recovering metallic iron from carbon-containing converter steel slag according to claim 1, wherein the method comprises the following steps: the iron grade of the magnetic coarse slag in the S2 is 42-44%.
4. The method for recycling metallic iron from carbon-containing converter steel slag according to claim 1, wherein the method comprises the following steps: the smelting time in the S3 is 60-150 min, and the smelting temperature is 1600-1720 ℃.
5. The method for recovering metallic iron from carbon-containing converter steel slag according to claim 1, wherein the method comprises the following steps: the iron grade of the magnetic iron ore concentrate in the S6 is more than or equal to 80 percent.
6. The method for recovering metallic iron from carbon-containing converter steel slag according to claim 1, wherein the method comprises the following steps: and the magnetic induction intensity of the dry magnetic separation in the S3 is 0.13T.
7. The method for recovering metallic iron from carbon-containing converter steel slag according to claim 1, wherein the method comprises the following steps: and the magnetic induction intensity of the dry magnetic separation in the S6 is 0.13T.
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| CN202111410051.8A CN113981163A (en) | 2021-11-20 | 2021-11-20 | Method for recovering metallic iron from carbon-containing converter steel slag |
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| CN202111410051.8A CN113981163A (en) | 2021-11-20 | 2021-11-20 | Method for recovering metallic iron from carbon-containing converter steel slag |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101864501A (en) * | 2010-06-22 | 2010-10-20 | 新兴河北工程技术有限公司 | Method for recycling iron from steel slag |
| RU2572438C1 (en) * | 2014-07-21 | 2016-01-10 | Валерий Никитич Гринавцев | Processing of dump steel-smelting slag heap |
| CN106381351A (en) * | 2016-08-31 | 2017-02-08 | 云南德胜钢铁有限公司 | Waste slag steel recycling method |
| CN107159426A (en) * | 2017-04-27 | 2017-09-15 | 酒泉钢铁(集团)有限责任公司 | A kind of slag is secondary to select iron method |
| CN109365106A (en) * | 2018-10-29 | 2019-02-22 | 酒泉钢铁(集团)有限责任公司 | A kind of stainless steel slag dry type magnetic separation device and technique |
-
2021
- 2021-11-20 CN CN202111410051.8A patent/CN113981163A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101864501A (en) * | 2010-06-22 | 2010-10-20 | 新兴河北工程技术有限公司 | Method for recycling iron from steel slag |
| RU2572438C1 (en) * | 2014-07-21 | 2016-01-10 | Валерий Никитич Гринавцев | Processing of dump steel-smelting slag heap |
| CN106381351A (en) * | 2016-08-31 | 2017-02-08 | 云南德胜钢铁有限公司 | Waste slag steel recycling method |
| CN107159426A (en) * | 2017-04-27 | 2017-09-15 | 酒泉钢铁(集团)有限责任公司 | A kind of slag is secondary to select iron method |
| CN109365106A (en) * | 2018-10-29 | 2019-02-22 | 酒泉钢铁(集团)有限责任公司 | A kind of stainless steel slag dry type magnetic separation device and technique |
Non-Patent Citations (1)
| Title |
|---|
| 李星等: "转炉钢渣磁选提铁研究", 《工业加热》 * |
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Application publication date: 20220128 |
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