CN110129492A - A method of processing steel slag - Google Patents
A method of processing steel slag Download PDFInfo
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- CN110129492A CN110129492A CN201910317250.0A CN201910317250A CN110129492A CN 110129492 A CN110129492 A CN 110129492A CN 201910317250 A CN201910317250 A CN 201910317250A CN 110129492 A CN110129492 A CN 110129492A
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- Prior art keywords
- slag
- molten iron
- filtrate
- reducing
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Classifications
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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
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B3/00—General features in the manufacture of pig-iron
- C21B3/04—Recovery of by-products, e.g. slag
- C21B3/06—Treatment of liquid slag
-
- 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
- C21C1/00—Refining of pig-iron; Cast iron
- C21C1/02—Dephosphorising or desulfurising
-
- 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
- C21C1/00—Refining of pig-iron; Cast iron
- C21C1/04—Removing impurities other than carbon, phosphorus or sulfur
-
- 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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The present invention relates to a kind of methods for handling steel slag, belong to Technologies of Steel Slag Treatment field；Include the following steps: S1, liquid converter slag is tapped, then carries out slag splashing operation；S2, liquid steel slag obtained by step S1 is subjected to reducing and smelting, slags tap, obtains reducing slag, then tapping, obtain reduction molten iron；Recycle the reducing slag；S3, molten iron will be restored obtained by step S2, carry out desulfurization and/or desiliconization and/or dephosphorization operation, be purified molten iron and clinker, the purifying molten iron is just smelted, is then recycled；S4, clinker obtained by step S3 is subjected to cooling of fetching water, then filters, obtain filtrate and filter residue, the filter residue is dried, then smelts and recycles；S5, into filtrate obtained by step S4, acid adding is to its PH to be neutral, and generation precipitating and gas filter and recycle the precipitating, and filtrate obtained by the filtering is spare；S6, FeCl is utilized3Gas obtained by solution treatment steps S5 and filtrate, the present invention have the characteristics that high-efficiency environment friendly.
Description
Technical field
The invention belongs to Technologies of Steel Slag Treatment fields, and in particular to a method of processing steel slag.
Background technique
As " environmental protection tax law " was implemented from January 1st, 2018, metallurgical slag starts to impose environment protection tax, is
25 yuan/t.Metallurgical slag mainly includes blast furnace slag and vessel slag (steel slag), and blast furnace slag realizes resource utilization substantially；But converter
For slag because its characteristic is complex, high added value resource utilization rate is lower always, how the processing steel slag of high-efficiency environment friendly, become and work as
Preceding problem in the urgent need to address.
Technology of Steel Slag Processing has hot application method, heat stewing method, wind quenching method, drum process etc. at present, and process above is only capable of will be in steel slag
Metallic iron is separated, and cannot be separated iron oxide, and the tailings purposes problem that not can solve that treated
(treated, and tailings is mainly used for the basement process of engineering, and utility value is not high).In addition, the resources such as waste heat, phosphorus in steel slag
Substantially it cannot recycle.
Summary of the invention
In view of the above technical problems, the purpose of the present invention is to provide a kind of method for handling steel slag, there is high-efficiency environment friendly
The characteristics of.
The present invention provides a kind of method for handling steel slag, includes the following steps:
S1, liquid converter slag is tapped, then carries out slag splashing operation；
S2, liquid steel slag obtained by step S1 is subjected to reducing and smelting, slags tap, obtains reducing slag, then tapping, restored
Molten iron；Recycle the reducing slag；
S3, molten iron will be restored obtained by step S2, carries out desulfurization and/or desiliconization and/or dephosphorization operation, be purified molten iron and
The purifying molten iron is just smelted, is then recycled by clinker；
S4, clinker obtained by step S3 is subjected to cooling of fetching water, then filters, obtain filtrate and filter residue, the filter residue is dried
It is dry, it then smelts and recycles；
S5, into step S4 gained filtrate, acid adding is neutral, generation precipitating and gas to its PH, filters and recycles described sink
It forms sediment, it is described to be precipitated as H2SiO3, filtrate obtained by the filtering is spare；S6, FeCl is utilized3Gas obtained by solution treatment steps S5 and
Filtrate.
Further, in S2, when the reducing and smelting, carbonaceous reducing agent and/or modification raw material is added, it is preferred that described
Carbonaceous reducing agent includes coke powder and/or anthracite, and the modification raw material includes silica and/or iron-containing tailing.
Further, it is 100kg/t slag that quality, which is added, in the carbonaceous reducing agent, and the modification raw material is added quality and is
150kg/t slag.
Further, in S2, the condition of slagging tap are as follows: Tfe (Quan Tie) quality percentage in the clinker of the reducing and smelting
Content < 1%, and basicity is 1.0-1.5, it is preferred that the basicity is 1.2.
Further, in S2, when recycling the reducing slag, the reducing slag is subjected to water quenching, slag is formed, then returns
It receives.
Further, in S3, sodium carbonate and/or oxygen is added, carries out desulfurization and/or desiliconization and/or dephosphorization operation.
Further, it is 140kg/t molten iron that quality, which is added, in the sodium carbonate, and it is 30m that volume, which is added, in the oxygen3/t·
Molten iron.
Further, in S5, the acid is hydrochloric acid.
Further, in S6, when gas obtained by processing step S5 and filtrate, the gas is passed through the FeCl3Solution
In, the gas is CO2And H2S；Then by the FeCl3Solution is added in the filtrate, generates precipitating, described to be precipitated as
FePO4, filter and recycle the precipitating.
Further, the FeCl3Solution quality dosage is 100kg/t molten iron.
Compared with the prior art, the invention has the following advantages that
1, process makes full use steel slag thermal energy, handles steel slag using reducing process, and the gold in steel slag not only can be recycled
Belong to, the FeO in steel slag also can be recycled.
2, steel slag is converted slag by the technique, realizes the resource utilization of steel slag.
3, the phosphorus in steel slag is converted ferric phosphate by the technique, realizes the high value added utilization of phosphor resource.
4, steel slag is handled using the method for the present invention, there is positive economic benefit, cost can be reduced by reaching 1 ton of steel slag of processing
29 yuan or so, calculate according to 1,000,000 tons of output of steel are produced per year, it is contemplated that 29,000,000 yuan of cost can be reduced.
5, steel slag is handled using the method for the present invention, steel slag has obtained reasonable utilization, and environmental protection caused by avoiding steel slag from storing up is pressed
Power.
Specific embodiment
Below in conjunction with specific embodiment and embodiment, it is specifically described the present invention, advantages of the present invention and various effects
It thus will clearly present.It will be understood by those skilled in the art that these specific embodiments and embodiment are for illustrating
The present invention is not intended to limit the present invention.
Throughout the specification, unless otherwise specified, terms used herein are interpreted as usual in this field
Used meaning.Therefore, unless otherwise defined, all technical and scientific terms used herein has leads with belonging to the present invention
The identical meaning of the general understanding of field technique personnel.Contradiction if it exists, this specification are preferential.
Unless otherwise specified, various raw material, reagent, the instrument and equipment etc. used in the present invention, can pass through
Market is commercially available or can be prepared by existing method.
Embodiment 1
By taking conventional vessel slag as an example:
The present invention provides a kind of method for handling steel slag, includes the following steps:
S1, mass percentage will be contained for 1.7%P2O5, and the liquid converter slag that basicity is 3 is tapped, and is then splashed
Slag furnace retaining operation；
S2, liquid steel slag obtained by step S1 is poured into the mineral hot furnace of 45MVA, coke powder is added by 120kg/t slag and pressed
Silica is added in 300kg/t slag, carries out reducing and smelting, as the Tfe mass percentage < 1% in the clinker of reducing and smelting, and
It when basicity is 1.2, slags tap, obtains reducing slag, the reducing slag is subjected to water quenching, slag is formed, then recycles；When in furnace
After reduction molten iron (containing P 2.1%) reaches 80 tons, tapping is carried out, obtains reduction molten iron；
S3, it is restored in molten iron to obtained by step S2, the sodium carbonate and 30m of 140kg/t molten iron is added3The oxygen of/t molten iron
Gas carries out desulfurization and/or desiliconization and/or dephosphorization operation, is purified molten iron and clinker, the purifying molten iron is just smelted,
Then it recycles；
S4, clinker obtained by step S3 is subjected to cooling of fetching water, then filters, obtain filtrate and filter residue, the filter residue is dried
It is dry, it then smelts and recycles；
S5, into filtrate obtained by step S4, press 10kg/t molten iron, be added hydrochloric acid (concentration 31%) to its PH be it is neutral,
Precipitating and gas are generated, the precipitating is filtered and recycle, filtrate obtained by the filtering is spare；
S6, FeCl is utilized3Solution distinguishes gas and filtrate obtained by processing step S5, will when gas obtained by processing step S5
The gas is passed through FeCl3In solution；When filtrate obtained by processing step S5, FeCl is added in Xiang Suoshu filtrate3Solution, it is raw
At precipitating, filters and recycle the precipitating.
Embodiment 2
By taking dephosphorization converter slag as an example:
The present invention provides a kind of method for handling steel slag, includes the following steps:
S1, mass percentage will be contained for 5%P2O5, and the liquid converter slag that basicity is 2 is tapped, and then carries out splashing slag
Furnace retaining operation；
S2, liquid steel slag obtained by step S1 is poured into the mineral hot furnace of 45MVA, coke powder is added by 100kg/t slag and pressed
Silica is added in 150kg/t slag, carries out reducing and smelting, as the Tfe mass percentage < 1% in the clinker of reducing and smelting, and
It when basicity is 1.0, slags tap, obtains reducing slag, the reducing slag is subjected to water quenching, slag is formed, then recycles；When in furnace
After reduction molten iron (containing P 7.7%) reaches 80 tons, tapping is carried out, obtains reduction molten iron；
S3, it is restored in molten iron to obtained by step S2, the sodium carbonate and 100m of 560kg/t molten iron is added3/ t molten iron
Oxygen carries out desulfurization and/or desiliconization and/or dephosphorization operation, molten iron and clinker is purified, by the purifying molten iron just smelting
Refining, is then recycled；
S4, clinker obtained by step S3 is subjected to cooling of fetching water, then filters, obtain filtrate and filter residue, the filter residue is dried
It is dry, it then smelts and recycles；
S5, into filtrate obtained by step S4, press 20kg/t molten iron, be added hydrochloric acid (concentration 31%) to its PH be it is neutral,
Precipitating and gas are generated, the precipitating is filtered and recycle, filtrate obtained by the filtering is spare；
S6, FeCl is utilized3Solution distinguishes gas and filtrate obtained by processing step S5, when gas obtained by processing step S5, presses
The gas is passed through FeCl by 100kg/t molten iron3In solution；When filtrate obtained by processing step S5, Xiang Suoshu filtrate
Middle addition FeCl3Solution generates precipitating, filters and recycle the precipitating.
Embodiment 3
By taking decarburization vessel slag as an example:
S1, mass percentage will be contained for 1.4%P2O5, and the liquid converter slag that basicity is 3 is tapped, and is then splashed
Slag furnace retaining operation；
S2, liquid steel slag obtained by step S1 is poured into the mineral hot furnace of 45MVA, by 120kg/t slag be added anthracite with
Iron-containing tailing is added by 300kg/t slag, reducing and smelting is carried out, as the Tfe mass percentage < in the clinker of reducing and smelting
1%, and basicity be 1.5 when, slag tap, obtain reducing slag, by the reducing slag carry out water quenching, formed slag, then recycle；
After furnace reduction molten iron (containing P 2.1%) reaches 80 tons, tapping is carried out, reduction molten iron is obtained；
S3, it is restored in molten iron to obtained by step S2, the sodium carbonate and 30m of 140kg/t molten iron is added3The oxygen of/t molten iron
Gas carries out desulfurization and/or desiliconization and/or dephosphorization operation, is purified molten iron and clinker, the purifying molten iron is just smelted,
Then it recycles；
S4, clinker obtained by step S3 is subjected to cooling of fetching water, then filters, obtain filtrate and filter residue, the filter residue is dried
It is dry, it then smelts and recycles；
S5, into filtrate obtained by step S4, press 10kg/t molten iron, be added hydrochloric acid (concentration 31%) to its PH be it is neutral,
Precipitating and gas are generated, the precipitating is filtered and recycle, filtrate obtained by the filtering is spare；
S6, FeCl is utilized3Solution distinguishes gas and filtrate obtained by processing step S5, when gas obtained by processing step S5, presses
The gas is passed through FeCl by 100kg/t molten iron3In solution；When filtrate obtained by processing step S5, Xiang Suoshu filtrate
Middle addition FeCl3Solution generates precipitating, filters and recycle the precipitating.
Finally, it is to be noted that, the terms "include", "comprise" or its any other variant be intended to it is non-exclusive
Property include so that include a series of elements process, method, article or equipment not only include those elements, but also
Further include other elements that are not explicitly listed, or further include for this process, method, article or equipment it is intrinsic
Element.
Although preferred embodiments of the present invention have been described, it is created once a person skilled in the art knows basic
Property concept, then additional changes and modifications may be made to these embodiments.So it includes excellent that the following claims are intended to be interpreted as
It selects embodiment and falls into all change and modification of the scope of the invention.
Obviously, various changes and modifications can be made to the invention without departing from essence of the invention by those skilled in the art
Mind and range.In this way, if these modifications and changes of the present invention belongs to the range of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to include these modifications and variations.
Claims (10)
1. a kind of method for handling steel slag, which comprises the steps of:
S1, after liquid converter slag is tapped, slag splashing operation is carried out；
S2, liquid steel slag obtained by step S1 is subjected to reducing and smelting, slagged tap, obtain reducing slag, tapping obtains reduction molten iron；It returns
Receive the reducing slag；
S3, molten iron will be restored obtained by step S2, carry out desulfurization and/or desiliconization and/or dephosphorization operation, be purified molten iron and furnace
The purifying molten iron is just smelted, is then recycled by slag；
S4, clinker obtained by step S3 is subjected to cooling of fetching water, then filters, obtain filtrate and filter residue, the filter residue is dried, so
After smelt and recycle；
S5, into filtrate obtained by step S4, for acid adding to its PH to be neutral, generation precipitating and gas filter and recycle the precipitating,
Filtrate obtained by the filtering is spare；
S6, FeCl is utilized3Gas obtained by solution treatment steps S5 and filtrate.
2. the method according to claim 1, wherein in S2, when the reducing and smelting, carbonaceous reducing agent is added
And/or modification raw material, it is preferred that the carbonaceous reducing agent includes coke powder and/or anthracite, and the modification raw material includes silica
And/or iron-containing tailing.
3. according to the method described in claim 2, it is characterized in that, it is 100-120kg/ that quality, which is added, in the carbonaceous reducing agent
T slag, it is 150-300kg/t slag that quality, which is added, in the modification raw material.
4. the method according to claim 1, wherein in S2, the condition of slagging tap are as follows: the furnace of the reducing and smelting
Tfe mass percentage < 1% in slag, and basicity is 1.0-1.5, it is preferred that the basicity is 1.2.
5. the method according to claim 1, wherein in S2, when recycling the reducing slag, by the reducing slag into
Row water quenching forms slag, then recycles.
6. sodium carbonate and/or oxygen is added the method according to claim 1, wherein in S3, carry out desulfurization and/
Or desiliconization and/or dephosphorization operate.
7. according to the method described in claim 6, it is characterized in that, it is 140-560kg/t iron that quality, which is added, in the sodium carbonate
Water, it is 30-100m that volume, which is added, in the oxygen3/ t molten iron.
8. the method according to claim 1, wherein the acid is hydrochloric acid in S5.
9. the method according to claim 1, wherein in S6, when gas obtained by processing step S5 and filtrate, by institute
It states gas and is passed through the FeCl3In solution, then by the FeCl3Solution is added in the filtrate, generates precipitating, filters and returns
Receive the precipitating.
10. according to the method described in claim 8, it is characterized in that, the FeCl3Solution quality dosage is 100-150kg/t
Molten iron.
Priority Applications (1)
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| CN201910317250.0A CN110129492A (en) | 2019-04-19 | 2019-04-19 | A method of processing steel slag |
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| CN201910317250.0A CN110129492A (en) | 2019-04-19 | 2019-04-19 | A method of processing steel slag |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113278755A (en) * | 2021-06-02 | 2021-08-20 | 维泰(南通)金属材料有限公司 | Method for improving metallization rate in steel solid waste smelting reduction process |
| CN113800805A (en) * | 2021-09-08 | 2021-12-17 | 辽宁科大中驰镁建材科技有限公司 | Preparation method for preparing concrete plastic retaining agent by using acid pickling phosphorization waste residues |
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| CN113278755A (en) * | 2021-06-02 | 2021-08-20 | 维泰(南通)金属材料有限公司 | Method for improving metallization rate in steel solid waste smelting reduction process |
| CN113800805A (en) * | 2021-09-08 | 2021-12-17 | 辽宁科大中驰镁建材科技有限公司 | Preparation method for preparing concrete plastic retaining agent by using acid pickling phosphorization waste residues |
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