CN109536729A - A kind of utilization method for the dedusting ash that smelting iron and steel generates - Google Patents
A kind of utilization method for the dedusting ash that smelting iron and steel generates Download PDFInfo
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- CN109536729A CN109536729A CN201811271928.8A CN201811271928A CN109536729A CN 109536729 A CN109536729 A CN 109536729A CN 201811271928 A CN201811271928 A CN 201811271928A CN 109536729 A CN109536729 A CN 109536729A
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- dedusting ash
- iron
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- ash
- utilization method
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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
-
- 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
-
- 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
- C22B1/02—Roasting processes
-
- 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
- C22B1/16—Sintering; Agglomerating
-
- 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
-
- 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
-
- 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 kind of utilization methods for the dedusting ash that smelting iron and steel generates, and belong to field of iron and steel smelting, solve the problems, such as that existing dedusting ash causes molten iron cost to rise using method, the life of the blast furnace shortens.The present invention is the following steps are included: analyze Pb, ZnO, K in various dedusting ash2O、Na2The mass content of O and TFe；Dedusting ash by the mass content of ZnO more than or equal to 5% is divided into high zinc content dedusting ash；By K2O、Na2Dedusting ash of the gross mass content of O and Pb more than or equal to 8% is divided into high basic metal content and heavy metal dedusting ash；Remaining dedusting ash is divided into low harmful element dedusting ash；Three classes dedusting ash is utilized respectively.Various dedusting ash are taken classified use by the present invention, so that valuable constituent maximum resource utilization；The high dedusting ash of zinc, potassium, sodium content is individually separated, the iron powder after removing zinc and alkali metal returns again to be utilized with sintering, reduces blast furnace Zn load, alkali load.
Description
Technical field
The invention belongs to field of iron and steel smelting, and in particular to a kind of utilization method for the dedusting ash that smelting iron and steel generates.
Background technique
Smelting iron and steel all will essentially generate dedusting ash, remove through three oversintering, ironmaking, steel-making processes, each process
The total amount that dust generates is the 8%~15% of output of steel, and many kinds of, distinct but total feature is that fine size, ingredient are multiple
It is miscellaneous, big using difficulty.Under normal conditions, it takes and all returns to sintering process reuse, although such mode recoverable iron,
The beneficial elements such as calcium, magnesium, carbon, but bring harm is that zinc, potassium, sodium, lead etc. are enriched with the harmful element circular of iron-smelting process, is caused
Increase molten iron cost, life of the blast furnace shortening, produces direct motion by extreme influence, be unfavorable for iron and steel enterprise's sustainable and stable development.
Summary of the invention
The object of the present invention is to provide a kind of utilization methods for the dedusting ash that smelting iron and steel generates, to solve existing dedusting ash
The problem of causing molten iron cost rising, the life of the blast furnace to be shortened using method.
The technical scheme is that a kind of utilization method for the dedusting ash that smelting iron and steel generates, comprising the following steps:
Step 1: check analysis: to smelting iron and steel generate dedusting ash it is separately sampled, analyze Pb, ZnO in various dedusting ash,
K2O、Na2The mass content of O and TFe；
Step 2: various dedusting ash are classified: the mass content of ZnO is greater than according to the inspection result that step 1 obtains
Or the dedusting ash equal to 5% is divided into high zinc content dedusting ash；By K2O、Na2The gross mass content of O and Pb is greater than or equal to 8%
Dedusting ash is divided into high basic metal content and heavy metal dedusting ash；Remaining dedusting ash is divided into low harmful element dedusting ash；
Step 3: three classes dedusting ash is utilized respectively according to the dividing condition of step 2.
As a further improvement of the present invention, in step 3, the high zinc content dedusting ash is subjected to roasting reduction, point
Crude zinc powder and kiln slag are not obtained, and kiln slag obtains Iron concentrate after ore grinding, magnetic separation and sorts tailings.
As a further improvement of the present invention, in step 3, roast also using rotary kiln, tunnel oven or rotary hearth furnace
It is former.
As a further improvement of the present invention, in step 3, the temperature of roasting reduction is 1000-1300 degrees Celsius.
As a further improvement of the present invention, in step 3, zinc fume caused by roasting reduction is recycled using cloth bag,
Obtain crude zinc powder.
As a further improvement of the present invention, in step 3, the Iron concentrate is returned into sintered material and is utilized.
As a further improvement of the present invention, in step 3, by the high basic metal dedusting ash and heavy metal dedusting ash
It is stirred water logging, concentration underflow and concentration overflow are respectively obtained after concentrated, after concentration underflow filtering, is removed
The ferrous material of harmful element, the ferrous material that will remove harmful element return to sintering and utilize, and the concentration overflow is purified, mistake
Filter cake and concentration overflow scavenging solution are respectively obtained after filter, the filter cake is attached most importance to metallic product, and the concentration overflow scavenging solution is through steaming
It evaporates, crystallize, drying process, obtaining the mix products of potassium chloride and sodium chloride.
As a further improvement of the present invention, in step 3, the low harmful element dedusting ash is returned into sintered material
It utilizes.
As a further improvement of the present invention, in step 3, the quality of iron in the low harmful element dedusting ash is contained
Supplying converter utilizes after a part of pressure ball of the amount more than or equal to 55%, and rest part returns to sintered material and utilizes.
The beneficial effects of the present invention are:
1. various dedusting ash take classified use, the cost recovery of respective technique is reduced, has accomplished the valuable constituent utilization of resources
It maximizes；
2. after the high dedusting ash of zinc, potassium, sodium content is individually separated, zinc and alkali metal are removed using suitable process, it is obtained
The mass content of iron powder iron is not less than 45%, which is returned again and is utilized with sintering, blast furnace Zn load, alkali load are greatly reduced,
To reduction blast furnace coke ratio, extend the life of the blast furnace, it is ensured that smooth operation of furnace is highly effective；
3. the present invention has obtained the mixing of high value added product crude zinc powder and potassium chloride and sodium chloride compared with conventional recovery method
Product is truly realized zero-emission, promotes the circulation continuous development of steel and iron industry；
4. the present invention is applied widely, all smelting iron and steel enterprises different suitable for materials, smelting process is different.
Detailed description of the invention
Fig. 1 is flow chart of the invention.
Specific embodiment
The following examples can further illustrate the present invention, but the invention is not limited in any way.
Embodiment 1,
The dedusting ash that sintering process generates has head ash, tail ash and ingredient ash；Iron-smelting generate dedusting ash have gravitational dust,
Sack dust and environment ash, the dedusting ash that steel making working procedure generates once dedusting ash, final dusting ash, Desulphurization, refining it is grey and
Mixed iron blast ash.These dedusting ash are followed the steps below into utilization:
Step 1: check analysis: the dedusting ash generated to sintering process, Iron-smelting, steel making working procedure is separately sampled, analyzes various
Pb, ZnO, K in dedusting ash2O、Na2The mass content of O and TFe, the results are shown in Table 1 for concrete analysis, and the slash in table 1 indicates
Content is extremely low, is not detected.
Step 2: various dedusting ash are classified: according to the inspection result that step 1 obtains by the mass content of ZnO
Dedusting ash more than or equal to 5%, i.e. sack dust are divided into high zinc content dedusting ash；By K2O、Na2The gross mass content of O and Pb
Dedusting ash more than or equal to 8%, i.e. head ash and refining ash, are divided into high basic metal content and heavy metal dedusting ash；By remaining
Dedusting ash is divided into low harmful element dedusting ash；
Step 3: three classes dedusting ash is utilized respectively according to the dividing condition of step 2.
The difference of embodiment 2, the present embodiment and embodiment 1 is: in step 3, for high zinc content dedusting ash, due to
Zn content is high, unsuitable direct reuse sintering, so carrying out high-temperature roasting reduction using rotary kiln, tunnel oven or rotary hearth furnace, usually
It is required that temperature, at 1000-1300 degrees Celsius, carbon therein is utilized in roasting process, and ingredient containing zinc is in high temperature reducing atmospheres
In become metal zinc fume, zinc fume recycled by cloth bag after with air catalytic oxidation at zinc oxide, it is the mature technology, de-
Zinc rate reaches 90% or more, and ZnO content can directly feed zinc abstraction enterprise 40% or more in obtained crude zinc powder；In kiln slag
Based on the oxide of metallic iron and iron, 60% or more Iron grade is obtained through mill ore magnetic selection containing slag making elements such as silicon, calcium simultaneously
Iron concentrate for sintering, the tailings selected can be used for brickmaking.
The difference of embodiment 3, the present embodiment and embodiment 2 is: in step 3, for high basic metal and content of beary metal
Dedusting ash is stirred water logging rich in alkali metal elements and the lead such as potassium, sodium, respectively obtained after concentrated concentration underflow and
Overflow is concentrated, phase analysis is in concentration underflow, and after concentration underflow filtering, the ferrous material for the harmful element that is removed is returned and burnt
Knot utilizes；Concentration overflow is purified, respectively obtains filter cake and concentration overflow scavenging solution after filtering, and filter cake is that leaded heavy metal produces
Object can be sold outward；Overflow scavenging solution is concentrated through distillation, crystallization, drying process, the mixing for obtaining potassium chloride and sodium chloride produces
Object can be sold outward.
The technique, which only stirs links, the products such as water logging, concentration, dehydration, ferrous material, heavy metal product and potassium chloride
With the mixture of sodium chloride, iron loss link, thus iron recovery >=95% is substantially not present in whole process, because alkali metal be with
The form of chloride exists, and water logging takes off potassium rate >=90%, removing sodium rate >=70%, stable product quality, and K contains in gained Potassium Chloride Product
Amount is supplied with the quality raw materials of sylvite, potash fertilizer plant 83% or more.
The difference of embodiment 4, the present embodiment and embodiment 3 is: in step 3, for low harmful element dedusting ash, by
Low in harmful element content, ingredient is based on the ingredient beneficial to sintering such as iron, carbon, calcium, magnesium, using directly return sintered material
Mode utilized, there is process cost is low, recovering effect is good advantage.
The difference of embodiment 5, the present embodiment and embodiment 3 is:, will for low harmful element dedusting ash in step 3
Wherein the mass content of TFe is greater than or equal to 55% a part of dedusting ash, i.e. primary dedusting ash, and supplying converter utilizes after pressure ball,
Rest part returns to sintered material and utilizes.
Claims (9)
1. a kind of utilization method for the dedusting ash that smelting iron and steel generates, it is characterised in that the following steps are included:
Step 1: check analysis: the dedusting ash generated to smelting iron and steel is separately sampled, analyzes Pb, ZnO, K in various dedusting ash2O、
Na2The mass content of O and TFe；
Step 2: various dedusting ash are classified: the mass content of ZnO is greater than according to the inspection result that step 1 obtains
Or the dedusting ash equal to 5% is divided into high zinc content dedusting ash；By K2O、Na2The gross mass content of O and Pb is greater than or equal to 8%
Dedusting ash is divided into high basic metal content and heavy metal dedusting ash；Remaining dedusting ash is divided into low harmful element dedusting ash；
Step 3: three classes dedusting ash is utilized respectively according to the dividing condition of step 2.
2. the utilization method for the dedusting ash that a kind of smelting iron and steel according to claim 1 generates, it is characterised in that: in step
In three, the high zinc content dedusting ash is subjected to roasting reduction, respectively obtains crude zinc powder and kiln slag, kiln slag passes through ore grinding, magnetic separation
After obtain Iron concentrate and sort tailings.
3. the utilization method for the dedusting ash that a kind of smelting iron and steel according to claim 2 generates, it is characterised in that: in step
In three, roasting reduction is carried out using rotary kiln, tunnel oven or rotary hearth furnace.
4. the utilization method for the dedusting ash that a kind of smelting iron and steel according to claim 3 generates, it is characterised in that: in step
In three, the temperature of roasting reduction is 1000-1300 degrees Celsius.
5. the utilization method for the dedusting ash that a kind of smelting iron and steel according to claim 4 generates, it is characterised in that: in step
In three, using zinc fume caused by cloth bag recycling roasting reduction, crude zinc powder is obtained.
6. the utilization method for the dedusting ash that a kind of smelting iron and steel according to claim 5 generates, it is characterised in that: in step
In three, the Iron concentrate is returned into sintered material and is utilized.
7. the utilization method for the dedusting ash that a kind of smelting iron and steel according to claim 1 to 6 generates, feature
It is: in step 3, the high basic metal dedusting ash and heavy metal dedusting ash is stirred water logging, obtained respectively after concentrated
To concentration underflow and concentration overflow, after concentration underflow filtering, the ferrous material for the harmful element that is removed has removing
The ferrous material of evil element returns to sintering and utilizes, and the concentration overflow is purified, filter cake is respectively obtained after filtering and overflow is concentrated
Scavenging solution, the filter cake are attached most importance to metallic product, and the concentration overflow scavenging solution obtains potassium chloride through distillation, crystallization, drying process
With the mix products of sodium chloride.
8. the utilization method for the dedusting ash that a kind of smelting iron and steel according to claim 7 generates, it is characterised in that: in step
In three, the low harmful element dedusting ash is returned into sintered material and is utilized.
9. the utilization method for the dedusting ash that a kind of smelting iron and steel according to claim 7 generates, it is characterised in that: in step
In three, converter will be incorporated after a part of pressure ball of the mass content of iron in the low harmful element dedusting ash more than or equal to 55%
It utilizes, rest part returns to sintered material and utilizes.
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| CN201811271928.8A CN109536729A (en) | 2018-10-29 | 2018-10-29 | A kind of utilization method for the dedusting ash that smelting iron and steel generates |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110093509A (en) * | 2019-04-30 | 2019-08-06 | 金堆城钼业股份有限公司 | A method of utilizing the cigarette ash of bulk containing molybdenum Smelting Ferromolybdenum |
| CN111394581A (en) * | 2020-04-30 | 2020-07-10 | 舒新前 | Method for removing harmful components in iron-containing solid waste |
| CN114686689A (en) * | 2022-04-11 | 2022-07-01 | 华北理工大学 | Multi-source metallurgical dust treatment method |
| CN114934171A (en) * | 2022-05-30 | 2022-08-23 | 山东莱钢永锋钢铁有限公司 | Recovery processing method of iron-containing dedusting ash in ferrous metallurgy |
| CN115679097A (en) * | 2022-11-19 | 2023-02-03 | 新源县渣宝环保技术有限公司 | Method for recycling iron-making gas ash by using converter slag and refined dedusting ash |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110093509A (en) * | 2019-04-30 | 2019-08-06 | 金堆城钼业股份有限公司 | A method of utilizing the cigarette ash of bulk containing molybdenum Smelting Ferromolybdenum |
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| CN114686689B (en) * | 2022-04-11 | 2023-08-25 | 华北理工大学 | Multi-source metallurgical dust treatment method |
| CN114934171A (en) * | 2022-05-30 | 2022-08-23 | 山东莱钢永锋钢铁有限公司 | Recovery processing method of iron-containing dedusting ash in ferrous metallurgy |
| CN115679097A (en) * | 2022-11-19 | 2023-02-03 | 新源县渣宝环保技术有限公司 | Method for recycling iron-making gas ash by using converter slag and refined dedusting ash |
| CN115679097B (en) * | 2022-11-19 | 2023-11-17 | 新源县渣宝环保技术有限公司 | Method for recycling ironmaking gas ash by using converter slag and refining dust |
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Application publication date: 20190329 |