CN112708770A - Method for enriching iron, zinc and carbon from gas ash - Google Patents
Method for enriching iron, zinc and carbon from gas ash Download PDFInfo
- Publication number
- CN112708770A CN112708770A CN202011449419.7A CN202011449419A CN112708770A CN 112708770 A CN112708770 A CN 112708770A CN 202011449419 A CN202011449419 A CN 202011449419A CN 112708770 A CN112708770 A CN 112708770A
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- Prior art keywords
- zinc
- gas ash
- carbon
- iron
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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
- C22B7/02—Working-up flue dust
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/05—Preparation or purification of carbon not covered by groups C01B32/15, C01B32/20, C01B32/25, C01B32/30
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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
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B19/00—Obtaining zinc or zinc oxide
- C22B19/20—Obtaining zinc otherwise than by distilling
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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
- C22B19/00—Obtaining zinc or zinc oxide
- C22B19/30—Obtaining zinc or zinc oxide from metallic residues or scraps
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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
-
- 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
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
- Y02P20/133—Renewable energy sources, e.g. sunlight
Abstract
The invention discloses a method for enriching iron, zinc and carbon by using gas ash, which comprises the following steps: screening the gas ash to remove impurities, and then baking and grinding; conveying the gas ash into a wind power classification-wind magnetic separation device by air force; and (3) separating the gas ash by using a wind power classification-wind magnetic separation device to obtain an iron-rich material, a zinc-rich material and a carbon-rich material. The method can effectively treat iron, zinc and carbon in the gas ash, greatly improve the iron content in the obtained iron-rich material, is far higher than that of the original gas ash, and can be used for pelletizing and returning to a blast furnace. The obtained zinc-rich material and carbon-rich material have zinc and carbon contents higher than those of gas ash, and can be used for pyrometallurgical zinc extraction or other processes for zinc extraction. The invention reasonably and fully utilizes various valuable components of the gas ash, basically does not discharge new three wastes in the whole treatment process, effectively disposes waste resources and accords with the great trend of recycling of waste resource environmental protection treatment.
Description
Technical Field
The invention belongs to the technical field of metallurgical solid waste treatment, and particularly relates to a method for enriching iron, zinc and carbon in gas ash.
Background
Blast furnace gas ash is a byproduct generated in the smelting process of an iron-making blast furnace, and has different contents of iron, zinc and carbon according to different dust removal and collection parts, wherein the content of zinc is about 1 percent, the content of zinc can reach about 15 percent, but most of zinc contains about 3-12 percent, and in addition, the blast furnace gas ash mainly contains iron and carbon, the content of iron is about 20-45 percent, and the content of carbon is about 10-25 percent. The blast furnace gas mud can not be effectively and directly utilized, and if the blast furnace gas mud is directly returned to a blast furnace smelting system without being processed, the blast furnace accretion can be caused, the normal work of the blast furnace is influenced, and even the service life of the blast furnace is influenced.
At present, the blast furnace gas ash is mainly utilized in the method of smelting zinc by a pyrometallurgy method. In the pyrometallurgical zinc smelting process, rotary kiln nodulation is caused by the high iron content in the gas ash, and the rotary kiln nodulation needs to be treated when the nodulation is serious, and the shutdown is required for 3-7 days for treating the nodulation once, so that the yield is influenced, and the cost is increased. From the analysis of the utilization of the recovered resources, zinc, iron and carbon are all recoverable resources, and the economic value of the gas ash can be improved by separating and enriching the iron, the zinc and the carbon in the gas ash, but a mode capable of effectively separating and enriching the iron, the zinc and the carbon is absent at present, so that the gas ash has higher utilization value.
Disclosure of Invention
The invention aims to provide a method for enriching iron, zinc and carbon by using gas ash, which solves the technical problem of resource waste caused by blast furnace gas ash in the prior art.
The technical scheme adopted by the invention is as follows: a method for enriching iron, zinc and carbon by using gas ash comprises the following steps:
screening the gas ash to remove impurities, and then baking and grinding;
conveying the gas ash into a wind power classification-wind magnetic separation device by air force;
and (3) separating the gas ash by using a wind power classification-wind magnetic separation device to obtain an iron-rich material, a zinc-rich material and a carbon-rich material.
Optionally, the gas ash is collected by a blast furnace ironmaking dust removal system, and the gas ash contains 20% -45% of iron, 10% -25% of carbon and 1.5% -21.5% of zinc.
Optionally, the baking is performed by using one or more of a rotary kiln using gas as a combustion heat source, an electric energy baking device using electric energy for heating, and a baking room using coal as a combustion heat source, and the gas ash is baked to have a moisture content of less than 2%.
As an optional mode, a Raymond mill or a grinding device taking steel balls and steel bars as grinding media is selected for grinding, the granularity of the ground gas ash reaches over 180 meshes, the particles are uniform, and the separation is facilitated.
Optionally, the pneumatic conveying is induced air or blast air conveying, and the flow rate of a gas-solid mixture of gas ash and air is 20-260 m3/min。
Alternatively, the air classification-air magnetic separation device utilizes magnetic equipment thereof to separate iron-rich materials.
Optionally, the air classification-wind magnetic separation device has multi-level wind power, each level of wind power corresponds to one bin, and the attenuation rate from the initial wind power to the final wind power is 10-70%.
Optionally, the air classification-air magnetic separation device has 12 levels of wind power, each level of wind power corresponds to one bin, and magnetic equipment for separating iron-rich materials is arranged in the air induction channels of the 1 st-5 th bins. The 1 st to 5 th grade bins are used for enriching iron-rich materials in the gas ash, and the 6 th to 12 th grade bins are used for enriching zinc-rich materials and carbon-rich materials in the gas ash. According to the gas-solid mixing ratio of the air flow and the gas ash, the target enriched material elements in different bins have differences. The quality of the zinc-rich material can be improved by 2-10%, and the iron-rich material can be used as the main component of the iron-containing pellets and returned to the blast furnace for recycling.
Optionally, the magnetic device includes a plurality of strip-shaped electromagnets distributed at intervals, and the strip-shaped electromagnets are disposed in an induced air channel of the wind classification-wind magnetic separation device. The iron-rich materials can be enriched according to the magnetic strength of the strip-shaped electromagnets, and after the iron-rich materials are separated, different zinc-rich materials and carbon-rich materials are enriched according to different wind power levels and corresponding bins.
Alternatively, the magnetic device is stopped for 15 seconds every 5 minutes during operation.
The invention has the beneficial effects that:
the method can effectively treat iron, zinc and carbon in the gas ash, greatly improve the iron content in the iron-rich material obtained after treatment, is far higher than the iron content of the original gas ash, and can be used for pelletizing and returning to a blast furnace for use. The zinc and carbon contents of the treated zinc-rich material and carbon-rich material are higher than those of the gas ash, and the zinc-rich material and the carbon-rich material can be used for pyrometallurgical zinc extraction or other processes for zinc extraction. The invention reasonably and fully utilizes various valuable components of the gas ash, basically does not discharge new three wastes in the whole treatment process, effectively disposes waste resources and accords with the great trend of recycling of waste resource environmental protection treatment.
Detailed Description
Example 1
In this example, 10 tons of gas ash were directly taken from a certain blast furnace to analyze its main valuable components: 35.25 percent of iron, 18.32 percent of carbon, 5.01 percent of zinc and 1.89 percent of water. Screening the gas ash to remove impurities, then selecting one or more of a rotary kiln using gas as a combustion heat source, electric energy baking equipment using electric energy for heating and a drying room using coal as a combustion heat source for baking, and then grinding the mixture by a Raymond mill until the passing rate of 200 meshes is 95%. The wind power classification-wind magnetic separation device has four levels of wind power, each level of wind power corresponds to one bin, and the wind induction quantity is 80m3Each strip-shaped electromagnet accounts for 15 pieces, and each gap of 30cm is arranged on the first and second storage binsIn the induced air channel, each strip-shaped electromagnet stops working for 15 seconds every 5 minutes, and finally the iron-rich material, the zinc-rich material and the carbon-rich material are obtained. The iron-rich material contains 45.65% of iron, 8.38% of carbon and 2.11% of zinc, the iron content is greatly improved relative to the iron content in the gas ash, and the zinc and carbon contents are greatly reduced. The zinc-rich material contains 9.01% of zinc, and the zinc content is increased relative to the zinc content in the gas ash. The carbon-rich material contains 25.32% of carbon, and the carbon content is increased relative to the carbon content in the gas ash, so that the enrichment effect is achieved.
Example 2
In this example, 10 tons of gas ash were directly taken from a blast furnace: 35.25 percent of total iron, 18.32 percent of carbon, 5.01 percent of zinc and 1.89 percent of water. Screening the gas ash to remove impurities, then selecting one or more of a rotary kiln using gas as a combustion heat source, electric energy baking equipment using electric energy for heating and a drying room using coal as a combustion heat source for baking, and then grinding the mixture by a Raymond mill until the passing rate of 200 meshes is 95%. The wind power classification-wind magnetic separation device has ten-level wind power, each level of wind power corresponds to one bin, and the wind induction quantity is 120m3And (4) in min, the total number of the strip electromagnets is 45, each gap of 28cm is arranged in an induced air channel on the 1 st to 5 th grade storage bin, each strip electromagnet stops working for 15 seconds every 5 minutes, and the strip electromagnets continue to work to finally obtain the iron-rich material, the zinc-rich material and the carbon-rich material. The iron-rich material contains 48.01% of iron, 7.48% of carbon and 2.02% of zinc, the iron content is greatly increased relative to the iron content in the gas ash, and the zinc and carbon contents are greatly reduced. The zinc-rich material contains 9.55% of zinc, and the zinc content is increased relative to the zinc content in the gas ash. The carbon-rich material contains 26.32% of carbon, and the carbon content is increased relative to the carbon content in the gas ash, so that the enrichment effect is achieved. The gas ash components collected by different enrichment bins have 5% difference, and if part of the enrichment bins do not reach the target effect, the gas ash components can be mixed with the gas ash for repeated enrichment.
The method can effectively treat iron, zinc and carbon in the gas mud or ash, greatly improve the iron content in the iron-rich material obtained after treatment, is far higher than the iron content of the original gas ash, and can be used for pelletizing and returning to a blast furnace for use. The zinc and carbon contents of the treated zinc-rich material and carbon-rich material are higher than those of the gas ash, and the zinc-rich material and the carbon-rich material can be used for pyrometallurgical zinc extraction or other processes for zinc extraction. The invention reasonably and fully utilizes various valuable components of the gas ash, basically does not discharge new three wastes in the whole treatment process, effectively disposes waste resources and accords with the great trend of recycling of waste resource environmental protection treatment.
The present invention is not limited to the above-described alternative embodiments, and various other forms of products can be obtained by anyone in light of the present invention. The above detailed description should not be taken as limiting the scope of the invention, which is defined in the claims, and which the description is intended to be interpreted accordingly.
Claims (10)
1. A method for enriching iron, zinc and carbon by using gas ash is characterized by comprising the following steps:
screening the gas ash to remove impurities, and then baking and grinding;
conveying the gas ash into a wind power classification-wind magnetic separation device by air force;
and (3) separating the gas ash by using a wind power classification-wind magnetic separation device to obtain an iron-rich material, a zinc-rich material and a carbon-rich material.
2. The method for enriching iron, zinc and carbon from gas ash according to claim 1, wherein the gas ash is collected from a blast furnace iron making dust removing system, and the gas ash contains 20-45% of iron, 10-25% of carbon and 1.5-21.5% of zinc.
3. The method for enriching iron, zinc and carbon from gas ash as claimed in claim 1, wherein the baking is performed by using one or more of a rotary kiln using gas as a combustion heat source, an electric baking device using electric energy for heating, and a baking room using coal as a combustion heat source.
4. The method for enriching iron, zinc and carbon from gas ash according to claim 1, wherein the grinding is performed by a Raymond mill or a grinding device using steel balls and steel bars as grinding media, and the particle size of the gas ash after grinding is more than 180 meshes.
5. The method for enriching iron, zinc and carbon by using the gas ash as claimed in claim 1, wherein the pneumatic conveying is induced air or blast air conveying, and the flow rate of a gas-solid mixture of the gas ash and air is 20-260 m3/min。
6. The method for enriching iron, zinc and carbon from gas ash according to claim 1, wherein the air classification-air magnetic separation device separates iron-rich materials by using its magnetic device.
7. The method for enriching iron, zinc and carbon from gas ash according to claim 6, wherein the air classification-air magnetic separation device has multi-stage air force, and each stage of air force corresponds to one silo.
8. The method for enriching iron, zinc and carbon from gas ash according to claim 7, wherein the air classification-air magnetic separation device has 12-grade air force, each grade of air force corresponds to one bin, and magnetic equipment for separating iron-rich materials is arranged in the air induction channel of the 1 st to 5 th grade bins.
9. The method for enriching iron, zinc and carbon from gas ash according to claim 6, wherein the magnetic device comprises a plurality of strip-shaped electromagnets which are distributed at intervals, and the strip-shaped electromagnets are arranged in an induced air channel of the air classification-air magnetic separation device.
10. The method for enriching iron, zinc and carbon with gas ash according to claim 6, wherein the magnetic device is stopped for 15 seconds every 5 minutes of operation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011449419.7A CN112708770A (en) | 2020-12-09 | 2020-12-09 | Method for enriching iron, zinc and carbon from gas ash |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011449419.7A CN112708770A (en) | 2020-12-09 | 2020-12-09 | Method for enriching iron, zinc and carbon from gas ash |
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| Publication Number | Publication Date |
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| CN112708770A true CN112708770A (en) | 2021-04-27 |
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| CN202011449419.7A Pending CN112708770A (en) | 2020-12-09 | 2020-12-09 | Method for enriching iron, zinc and carbon from gas ash |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113981209A (en) * | 2021-10-14 | 2022-01-28 | 辽宁科技大学 | Method for recovering zinc and iron in blast furnace gas dust |
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| CN105087947A (en) * | 2015-09-16 | 2015-11-25 | 武汉钢铁(集团)公司 | Method for extracting zinc from blast furnace gas mud |
| CN107604110A (en) * | 2017-08-25 | 2018-01-19 | 鞍钢股份有限公司 | A kind of method that iron is selected from blast furnace dust |
| CN107619946A (en) * | 2017-08-25 | 2018-01-23 | 鞍钢股份有限公司 | A kind of blast furnace flue gas dedusting ash method of comprehensive utilization |
| CN110433956A (en) * | 2019-08-15 | 2019-11-12 | 唐山鑫联环保科技有限公司 | A method of recycling zinc, iron and/or carbon from blast furnace dust |
| CN110564971A (en) * | 2019-10-29 | 2019-12-13 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for recovering zinc from blast furnace gas mud |
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2020
- 2020-12-09 CN CN202011449419.7A patent/CN112708770A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105087947A (en) * | 2015-09-16 | 2015-11-25 | 武汉钢铁(集团)公司 | Method for extracting zinc from blast furnace gas mud |
| CN107604110A (en) * | 2017-08-25 | 2018-01-19 | 鞍钢股份有限公司 | A kind of method that iron is selected from blast furnace dust |
| CN107619946A (en) * | 2017-08-25 | 2018-01-23 | 鞍钢股份有限公司 | A kind of blast furnace flue gas dedusting ash method of comprehensive utilization |
| CN110433956A (en) * | 2019-08-15 | 2019-11-12 | 唐山鑫联环保科技有限公司 | A method of recycling zinc, iron and/or carbon from blast furnace dust |
| CN110564971A (en) * | 2019-10-29 | 2019-12-13 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for recovering zinc from blast furnace gas mud |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113981209A (en) * | 2021-10-14 | 2022-01-28 | 辽宁科技大学 | Method for recovering zinc and iron in blast furnace gas dust |
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Application publication date: 20210427 |
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