CN117209186A - Method for recycling hot steel slag - Google Patents
Method for recycling hot steel slag Download PDFInfo
- Publication number
- CN117209186A CN117209186A CN202310979256.0A CN202310979256A CN117209186A CN 117209186 A CN117209186 A CN 117209186A CN 202310979256 A CN202310979256 A CN 202310979256A CN 117209186 A CN117209186 A CN 117209186A
- Authority
- CN
- China
- Prior art keywords
- steel slag
- gas
- carbon dioxide
- calcium carbonate
- particles
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000002893 slag Substances 0.000 title claims abstract description 127
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 98
- 239000010959 steel Substances 0.000 title claims abstract description 98
- 238000000034 method Methods 0.000 title claims abstract description 38
- 238000004064 recycling Methods 0.000 title claims abstract description 18
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 90
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims abstract description 80
- 239000002245 particle Substances 0.000 claims abstract description 50
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 45
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 45
- 229910000019 calcium carbonate Inorganic materials 0.000 claims abstract description 40
- 239000007788 liquid Substances 0.000 claims abstract description 23
- 239000000292 calcium oxide Substances 0.000 claims abstract description 21
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims abstract description 21
- 238000010248 power generation Methods 0.000 claims abstract description 20
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000000428 dust Substances 0.000 claims abstract description 13
- 238000007664 blowing Methods 0.000 claims abstract description 12
- 238000004519 manufacturing process Methods 0.000 claims abstract description 12
- 238000002156 mixing Methods 0.000 claims abstract description 10
- 239000007787 solid Substances 0.000 claims abstract description 9
- 239000004568 cement Substances 0.000 claims abstract description 8
- 238000010438 heat treatment Methods 0.000 claims abstract description 8
- 238000006243 chemical reaction Methods 0.000 claims description 9
- 238000001816 cooling Methods 0.000 claims description 9
- 238000011084 recovery Methods 0.000 abstract description 6
- 239000007789 gas Substances 0.000 description 64
- 150000003839 salts Chemical class 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 238000000227 grinding Methods 0.000 description 3
- 239000011325 microbead Substances 0.000 description 3
- 238000003723 Smelting Methods 0.000 description 2
- 239000006227 byproduct Substances 0.000 description 2
- 239000002826 coolant Substances 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000007885 magnetic separation Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 239000002910 solid waste Substances 0.000 description 2
- 239000002918 waste heat Substances 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 238000005338 heat storage Methods 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 239000010808 liquid waste Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
Landscapes
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a method for recycling hot steel slag, which is characterized by comprising the following steps of: preheating calcium carbonate and carbon dioxide gas, blowing off and mixing the downward flowing steel slag hot liquid, and heating and decomposing calcium carbonate into calcium oxide and carbon dioxide in hot steel slag particles while the steel slag is blown off, granulated and cooled, wherein the carbon dioxide gas promotes the inside of the steel slag particles to form a porous structure, and the calcium oxide and the steel slag are combined to form basic slag particles; the high-temperature gas is sent to be used as a power generation heat source, the power generation tail gas is cooled and dedusted, and the solid calcium carbonate particles are separated and returned; the gas after dust removal is boosted, part of the gas is used as conveying gas of granular calcium carbonate, and the other part of the gas is discharged to manufacture liquid carbon dioxide; the basic slag particles are ground and then used as steel slag cement, and the basic steel slag is used for preheating carbon dioxide gas. The invention solves the problems that the balance utilization and the high added value recycling are difficult to carry out in the hot steel slag heat recovery process.
Description
Technical Field
The invention belongs to the field of recycling, and particularly relates to a method for recycling hot steel slag.
Background
The steel slag is solid waste discharged by equipment in the steel smelting process, the ingredients and the content of each component are related to the process and equipment of a production unit, and the steel slag produced by different smelting methods and equipment has larger difference. The general treatment mode of domestic steel slag is gas-liquid internal circulation recovery, and is used for roadbed materials, manufacturing steel slag bricks, treating waste water and other low-added-value utilization, so that the utilization rate is low, and secondary pollution is caused.
CN115354091a discloses a steel slag classification treatment and resource utilization method, which relates to the technical field of comprehensive utilization of resources. The steel slag classification treatment and resource utilization method comprises the following specific operations: conveying a slag pot containing high-temperature steel slag discharged from the rotary electric furnace to a wind crushing treatment line, carrying out wind crushing treatment on the high-temperature liquid steel slag at the upper part of the slag pot, and adopting hot disintegrating treatment on the residual steel slag. The method is used for classifying the characteristics of complex components of the hot steel slag, a large amount of industrial fuel gas or power is consumed for the hot disintegrating treatment and sintering in the process steps, and the method lacks a treatment means for the combustion tail gas, so that the method cannot achieve the real environmental protection and energy saving.
CN112760436a relates to a system and method for recycling waste heat of steel slag, which belongs to the technical field of steel slag recovery, and comprises a heat exchange device, a pressurized hot disintegrating device, a mixing device, a grinding device and a magnetic separation device which are sequentially arranged along the flow direction of the steel slag; the exchange heat device adopts molten salt for heat exchange and is used for primary cooling of steel slag, and is connected with a molten salt steam device; the pressurized hot disintegrating device is used for secondary cooling of the steel slag, water cooling is adopted, and the pressurized hot disintegrating device is connected with the steam-water heat exchange device; the cooling medium outlet of the steam-water heat exchange device is communicated with the cooling medium inlet of the molten salt steam device; the steel slag is cooled in two stages, enters a mixing device and is mixed with the blend uniformly in proportion, then is ground into fine powder through a grinding device, and then iron powder is separated from the fine powder through a magnetic separation device. Although the invention realizes the dual utilization of the waste heat recovery and the recycling of the high-temperature steel slag, the fused salt heat storage system has higher equipment investment cost, and the heat needs to be conveyed to an external network in the form of high-temperature steam, so that the direct application of the heat energy is not fully considered.
CN111218533a discloses a steel slag recycling treatment method, which belongs to the technical field of solid waste recycling, and the method comprises the steps of spraying and atomizing high-temperature liquid steel slag through a high-temperature resistant spray nozzle, granulating by high-speed air flow, and collecting the granulated steel slag in a collecting tank; the high-speed air flow is heated by the high-temperature liquid steel slag into hot air flow, and the hot air flow enters a heat exchanger for heat recovery. The invention has simple process, but the components of the microbeads formed after the liquid waste slag drops are rapidly cooled are complex, the microbeads are difficult to directly use after being recovered, and the microbeads are difficult to realize high value without further separation treatment.
According to the prior art, the overall proportion of the resource utilization of the hot steel slag is not high, and the stable and reliable utilization still has a limiting factor. Because the fluctuation of the components of the hot steel slag is large, certain difficulty is brought to production control, the process flow of the recycling treatment is complicated, byproducts in various processes cannot be fully utilized, and the problems of high early investment, low production income and difficult environmental protection treatment are caused.
Disclosure of Invention
A method for recycling hot steel slag is characterized in that: preheating carbon dioxide gas containing 1-100 meshes of calcium carbonate to 400-600 ℃, blowing and blending the hot liquid of the downward flowing steel slag at 1400-1680 ℃, and simultaneously, heating and decomposing the calcium carbonate into calcium oxide and carbon dioxide in hot steel slag particles while cooling the steel slag by blowing and granulating, wherein the carbon dioxide gas promotes the inside of the steel slag particles to form a porous structure, the calcium oxide and the steel slag are combined to form basic slag particles, the temperature of the basic slag particles is 950-1150 ℃, and the gas temperature is 900 ℃; the gas is sent to be used as a power generation heat source, the temperature of the power generation tail gas is reduced to 120-150 ℃ for dust removal, and the solid calcium carbonate particles are separated and returned; the gas after dust removal is boosted, part of the gas is used as conveying gas of granular calcium carbonate, part of the gas is discharged outside to be used for manufacturing liquid carbon dioxide, and basic slag particles are ground and then used as steel slag cement; the basic steel slag is used for preheating carbon dioxide gas.
Further, the reaction formula for decomposing the calcium carbonate into the calcium oxide and the carbon dioxide by heating is as follows: caCO (CaCO) 3 ==CaO+CO 2 -Q1。
Further, the gas is sent to be used as a power generation heat source, the heat transfer mode is high-temperature steam, and the reaction equation is H 2 O(L)==H 2 O(G)-Q2。
The invention discloses the following technical effects:
according to the invention, the carbon dioxide gas containing the calcium carbonate is mixed with the downward flowing steel slag hot liquid in a blowing way, so that the hot steel slag is decomposed into three parts of basic slag particles, basic steel slag and high-temperature gas, the three parts are recycled respectively, and each component and the heat of the basic steel slag are fully utilized, so that the steel slag has higher added value.
The invention promotes the calcium carbonate to release carbon dioxide in the granular steel slag, the generated gas enables the granular steel slag to form a porous structure, the grinding difficulty of the generated basic slag particles is greatly reduced compared with that of the steel slag which is directly ground, the porous basic steel slag is favorable for hydration, and the reaction rate of the steel slag in the next process stage is increased.
According to the invention, various treatment methods are adopted for the high-temperature gas, the recovered heat is used for dedusting and recovering calcium carbonate particles after power generation, and the dedusted gas is respectively used for conveying granular calcium carbonate and manufacturing liquid carbon dioxide, so that harmless treatment of process byproducts is realized, and the method can be well applied on a large scale.
The invention selects to blow and mix the steel slag hot liquid to collect heat and other products, and has high recovery efficiency, simple process flow and low equipment investment cost.
In the invention, the hot gas is sent to be used as a power generation heat source, the separated calcium carbonate after cooling can be used as a conveying gas and a raw material gas, the basic slag particles are ground and then used as steel slag cement, the basic steel slag is used for preheating carbon dioxide gas, and the process flow products can be directly put into other processes without other treatment.
Drawings
FIG. 1 is a process flow diagram of a method for the resource utilization of hot steel slag.
Description of the embodiments
Embodiments and aspects of the present invention will be described in detail below with reference to the attached drawings, and it is apparent that the described embodiments are only some but not all examples of the present invention. Based on the embodiments of the present invention, those skilled in the art may obtain other embodiments without making any creative effort, which fall within the protection scope of the present invention.
A method for recycling hot steel slag is characterized in that: preheating carbon dioxide gas containing 1-100 meshes of calcium carbonate to 400-600 ℃, blowing and blending the carbon dioxide gas with the temperature of 1400-1680 ℃ of the downward flowing steel slag hot liquid, wherein the steel slag loses heat and is cooled in the blowing and blending process, and the calcium carbonate is mixed into slag particles in the blowing process and is decomposed into carbon dioxide and calcium oxide in the slag particles. The reaction has the following reaction formula:
CaCO 3 ==CaO+CO 2 -Q1。
the carbon dioxide gas released by decomposing the calcium carbonate expands and overflows when being heated, a porous structure is formed in slag particles, the catalytic activity is maintained, and the reaction rate of the steel slag in the next process stage is increased.
The oxide and the salt in the calcium oxide and the steel slag are combined into basic slag particles, and the basic slag particles and other metal components are combined into the basic steel slag, wherein the temperature of the basic slag particles and the basic steel slag is 950-1150 ℃, and the gas temperature of the carbon dioxide and the calcium oxide particles is 900 ℃.
The gas is sent to be used as a power generation heat source to exchange heat with liquid water, the liquid water is heated to be high-temperature steam, and the high-temperature steam is sent to a power generation process, and the applied reaction equation is as follows: h 2 O(L)==H 2 O(G)-Q2。
The gas after separating the heat source is called power generation tail gas, the temperature of the power generation tail gas is reduced to 120-150 ℃, calcium oxide and part of carbon dioxide are combined to form solid calcium carbonate particles, the solid calcium carbonate particles are sent to dust removal, separated and returned to the solid calcium carbonate particles, and recycling is performed after recycling.
The main component of the gas after dust removal is carbon dioxide released by decomposing calcium carbonate and other salts at high temperature, part of the gas is recovered and used as conveying gas of granular calcium carbonate, and part of the gas is discharged to manufacture liquid carbon dioxide.
The basic slag particles are cooled and ground and then used as steel slag cement, and the basic steel slag is maintained at high temperature and is used for preheating calcium carbonate and carbon dioxide gas.
In order to more clearly illustrate the present invention, the following examples are provided.
Example 1
Preheating 100-mesh calcium carbonate-containing carbon dioxide gas to 400 ℃, blowing off and blending the hot liquid of the downward flowing steel slag at 1400 ℃, and simultaneously, heating and decomposing the calcium carbonate into calcium oxide and carbon dioxide in hot steel slag particles while the steel slag is blown off, granulating and cooling, wherein the carbon dioxide gas promotes the inside of the steel slag particles to form a porous structure, the calcium oxide and the steel slag are combined to form basic slag particles, the temperature of the basic slag particles is 980 ℃, and the gas temperature is 900 ℃; the gas is sent to be used as a power generation heat source, the temperature of the power generation tail gas is reduced to 120 ℃ for dust removal, and the solid calcium carbonate particles are separated and returned; the gas after dust removal is boosted, part of the gas is used as conveying gas of granular calcium carbonate, part of the gas is discharged outside to be used for manufacturing liquid carbon dioxide, and basic slag particles are ground and then used as steel slag cement; the basic steel slag is used for preheating carbon dioxide gas.
Example 2
Preheating 100-mesh calcium carbonate-containing carbon dioxide gas to 450 ℃, blowing off and blending the hot liquid of the downward flowing steel slag at 1500 ℃, and simultaneously, heating and decomposing the calcium carbonate into calcium oxide and carbon dioxide in hot steel slag particles while the steel slag is blown off, granulating and cooling, wherein the carbon dioxide gas promotes the inside of the steel slag particles to form a porous structure, the calcium oxide and the steel slag are combined to form basic slag particles, the temperature of the basic slag particles is 1050 ℃, and the gas temperature is 900 ℃; the gas is sent to be used as a power generation heat source, the temperature of the power generation tail gas is reduced to 1300 ℃ for dust removal, and the solid calcium carbonate particles are separated and returned; the gas after dust removal is boosted, part of the gas is used as conveying gas of granular calcium carbonate, part of the gas is discharged outside to be used for manufacturing liquid carbon dioxide, and basic slag particles are ground and then used as steel slag cement; the basic steel slag is used for preheating carbon dioxide gas.
Example 3
Preheating 100-mesh calcium carbonate-containing carbon dioxide gas to 580 ℃, blowing off and blending the hot liquid of the downward flowing steel slag at 1600 ℃, and simultaneously, heating and decomposing the calcium carbonate into calcium oxide and carbon dioxide in hot steel slag particles while the steel slag is blown off, granulating and cooling, wherein the carbon dioxide gas promotes the inside of the steel slag particles to form a porous structure, the calcium oxide and the steel slag are combined to form basic slag particles, the temperature of the basic slag particles is 1130 ℃, and the gas temperature is 900 ℃; the gas is sent to be used as a power generation heat source, the temperature of the power generation tail gas is reduced to 145 ℃ for dust removal, and the solid calcium carbonate particles are separated and returned; the gas after dust removal is boosted, part of the gas is used as conveying gas of granular calcium carbonate, part of the gas is discharged outside to be used for manufacturing liquid carbon dioxide, and basic slag particles are ground and then used as steel slag cement; the basic steel slag is used for preheating carbon dioxide gas.
Finally, it is noted that the above-mentioned preferred embodiments are merely illustrative of embodiments and technical solutions of the present invention and, although the present invention has been described in detail by means of the above-mentioned preferred embodiments, it should be understood by those skilled in the art that various changes in form and details may be made therein without departing from the scope of the present invention as defined in the appended claims.
Claims (3)
1. A method for recycling hot steel slag is characterized in that: preheating carbon dioxide gas containing 1-100 meshes of calcium carbonate to 400-600 ℃, blowing and blending the hot liquid of the downward flowing steel slag at 1400-1680 ℃, and simultaneously, heating and decomposing the calcium carbonate into calcium oxide and carbon dioxide in hot steel slag particles while cooling the steel slag by blowing and granulating, wherein the carbon dioxide gas promotes the inside of the steel slag particles to form a porous structure, the calcium oxide and the steel slag are combined to form basic slag particles, the temperature of the basic slag particles is 950-1150 ℃, and the gas temperature is 900 ℃; the gas is sent to be used as a power generation heat source, the temperature of the power generation tail gas is reduced to 120-150 ℃ for dust removal, and the solid calcium carbonate particles are separated and returned; the gas after dust removal is boosted, part of the gas is used as conveying gas of granular calcium carbonate, part of the gas is discharged outside to be used for manufacturing liquid carbon dioxide, and basic slag particles are ground and then used as steel slag cement; the basic steel slag is used for preheating carbon dioxide gas.
2. The method for recycling hot steel slag according to claim 1, which is characterized in that: the reaction formula for decomposing the calcium carbonate into calcium oxide and carbon dioxide by heating is as follows: caCO (CaCO) 3 ==CaO+CO 2 -Q1。
3. A method for recycling hot steel slag according to claim 1The method is characterized in that: the gas is sent to be used as a power generation heat source, the heat transfer mode is high-temperature steam, and the reaction equation is H 2 O(L)==H 2 O(G)-Q2。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310979256.0A CN117209186A (en) | 2023-08-05 | 2023-08-05 | Method for recycling hot steel slag |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310979256.0A CN117209186A (en) | 2023-08-05 | 2023-08-05 | Method for recycling hot steel slag |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117209186A true CN117209186A (en) | 2023-12-12 |
Family
ID=89034209
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310979256.0A Pending CN117209186A (en) | 2023-08-05 | 2023-08-05 | Method for recycling hot steel slag |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117209186A (en) |
-
2023
- 2023-08-05 CN CN202310979256.0A patent/CN117209186A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110982967B (en) | Method and device for realizing steel slag quenching and waste heat recovery by using water and carbon dioxide | |
| CN104846209B (en) | A kind of system and method for step-by-step reduction recovery ferrum and coal gasification recovery waste heat from molten copper slag | |
| CN110423854A (en) | A kind of electric energy perhydro flash reduction direct steelmaking system and technique | |
| CN102344124B (en) | Process for co-producing sulfuric acid, fine iron powder and iron oxide red by ferrous sulfate heptahydrate and pyrite | |
| CN110438277A (en) | A kind of whirlwind flash reduction direct steelmaking system and technique | |
| CN101531454B (en) | A mineral wool boiling melting method of directly using grainy waste slag and coal | |
| CN105087844B (en) | Blast furnace slag waste heat recovery and direct reduction joint production system and method | |
| CN106823774A (en) | A kind of utilization blast furnace slag fixes carbon dioxide and the apparatus and method for reclaiming sensible heat | |
| CN102674473B (en) | Process for preparing ferric oxide red by adopting iron vitriol | |
| CN108675911A (en) | A kind of carbide acetylene production technology for reducing carbide slag and generating | |
| CN101348842A (en) | Oxygen top blown smelting reduction iron manufacturing process | |
| CN107324288A (en) | A kind of acid waste gypsum integrated treatment and the technique recycled | |
| CN108913827A (en) | A kind of system and technique for utilizing atomization high-temperature liquid state slag and recycling high temperature sensible heat | |
| CN115490249B (en) | Method and system for preparing metal oxide powder and regenerating nitric acid by fractional pyrolysis of nitrate | |
| CN112195343A (en) | Lithium battery recycling method and system | |
| CN108128757B (en) | A kind of technique of flue gas during smelting sulphur | |
| CN107792891A (en) | A kind of method and application that cobalt-nickel-manganese oxide compound is produced with nickel cobalt manganese elemental metals | |
| CN109264751A (en) | A method of extracting lithium carbonate and ammonium metavanadate from lepidolite and vanadium-containing shale | |
| CN103043625B (en) | A kind of sulphur waste material is mixed and is burnt the method that ferrous sulfate waste material is prepared sulfuric acid | |
| CN110343878B (en) | Energy-saving and environment-friendly production method of nickel-iron alloy | |
| CN117209186A (en) | Method for recycling hot steel slag | |
| CN103086433A (en) | Method for preparing sodium dichromate by sodium-based molten salt oxidation continuous carbonization | |
| CN108516569A (en) | The method that lepidolite roasting prepares lithium sulfate solution | |
| CN101831516A (en) | Steel slag dry processing device and method | |
| CN101565767A (en) | Method for melting reduction iron making |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |