CN112939572A - Process for treating iron slag of steel plant by tunnel kiln - Google Patents
Process for treating iron slag of steel plant by tunnel kiln Download PDFInfo
- Publication number
- CN112939572A CN112939572A CN201911265323.2A CN201911265323A CN112939572A CN 112939572 A CN112939572 A CN 112939572A CN 201911265323 A CN201911265323 A CN 201911265323A CN 112939572 A CN112939572 A CN 112939572A
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- Prior art keywords
- tunnel kiln
- iron slag
- kiln
- treating iron
- steel
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B33/00—Clay-wares
- C04B33/02—Preparing or treating the raw materials individually or as batches
- C04B33/13—Compounding ingredients
- C04B33/16—Lean materials, e.g. grog, quartz
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B33/00—Clay-wares
- C04B33/02—Preparing or treating the raw materials individually or as batches
- C04B33/13—Compounding ingredients
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B33/00—Clay-wares
- C04B33/02—Preparing or treating the raw materials individually or as batches
- C04B33/13—Compounding ingredients
- C04B33/132—Waste materials; Refuse; Residues
- C04B33/138—Waste materials; Refuse; Residues from metallurgical processes, e.g. slag, furnace dust, galvanic waste
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/65—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes
- C04B2235/656—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes characterised by specific heating conditions during heat treatment
- C04B2235/6567—Treatment time
-
- 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
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/60—Production of ceramic materials or ceramic elements, e.g. substitution of clay or shale by alternative raw materials, e.g. ashes
Abstract
The invention provides a process for treating iron slag of a steel plant by a tunnel kiln, which comprises the following steps: s1, laying inert materials to the bottom of a tunnel kiln; s2, uniformly mixing the iron slag of the steel mill with a cosolvent to prepare a green brick; s3, placing the green bricks into a dryer for drying; s4, loading the green bricks into a kiln car, pushing the green bricks into a tunnel kiln, introducing reducing gas, and firing; and S5, after the brick is taken out of the kiln, crushing the green brick into small particles. The invention effectively solves the problems of severe hardening, incomplete volatilization of zinc, lead and the like, low recovery rate of valuable metals, incapability of recycling generated iron slag and the like in the traditional process.
Description
Technical Field
The invention relates to the technical field of steel slag treatment, in particular to a process for treating iron slag in a steel mill by a tunnel kiln.
Background
The tunnel kiln is a modern continuous sintering thermal equipment, is widely used for the roasting production of ceramic products, and is also widely applied in metallurgical industries such as grinding materials and the like. The latest tunnel kiln designed in the place of Russian Linning Greeler is more advanced.
The traditional process of treating slag with high iron content in a tunnel kiln to recover zinc and lead is not successful. The main reason is that iron is easily changed into FeO and Fe in a reducing atmosphere, and FeO is easily mixed with SiO2At the temperature of over 900 ℃, fayalite is formed and low-melting-point mineral substances are formed with other impurities, so that severe hardening and incomplete volatilization of zinc, lead and the like are caused, the recovery rate of valuable metals is low, and the generated iron slag can not be reused.
Disclosure of Invention
The invention aims to provide a process for treating iron slag in a steel plant by a tunnel kiln, which effectively solves the problems that the traditional process is seriously hardened, zinc, lead and the like are not volatilized completely, the recovery rate of valuable metals is low, the generated iron slag cannot be reused and the like.
The technical scheme of the invention is realized as follows:
the invention provides a process for treating iron slag of a steel plant by a tunnel kiln, which comprises the following steps:
s1, laying inert materials to the bottom of a tunnel kiln;
s2, uniformly mixing the iron slag of the steel mill with a cosolvent to prepare a green brick;
s3, placing the green bricks into a dryer for drying;
s4, loading the green bricks into a kiln car, pushing the green bricks into a tunnel kiln, introducing reducing gas, and firing;
and S5, after the brick is taken out of the kiln, crushing the green brick into small particles.
As a further improvement of the invention, the inert material is one or a mixture of more of quartz sand, soil, slurry, crushed stone and crushed brick.
As a further improvement of the invention, the inert materials are quartz sand and slurry.
As a further improvement of the invention, the mass ratio of the quartz sand to the slurry is 5: (1-2).
As a further improvement of the invention, the co-solvent is selected from PbF2、BiF2、Cr2O3、BaO、B2O3One or more of NACl.
As a further improvement of the invention, the cosolvent is NaCl, BaO, B2O3The NaCl, BaO and B2O3The mass ratio of (1) - (2) to (0.5-1.5) is 5.
As a further improvement of the invention, the drying condition is 110-200 ℃ for 6-12 h.
As a further improvement of the invention, the firing conditions of the tunnel kiln are that the kiln inlet temperature is 100-.
As a further development of the invention, the reducing gas is CO or H2。
As a further development of the invention, the particle size of the small particles is less than 0.07 mm.
The invention has the following beneficial effects: the inventionThe problem is solved by combining two methods, namely adding cosolvent into the mixed material, wherein the cosolvent is preferentially mixed with SiO2Binding to high melting point minerals, thereby preventing SiO2Forming a low melting point mineral with ferrous oxide. The addition amount is 1 per mill-1%; and secondly, a layer of inert material with the thickness of about 0.5-1.0 cm is paved at the bottom of the kiln car. The inert materials do not generate any physical and chemical changes with the materials within the use temperature range, and the materials are prevented from contacting the bottom of the kiln car, so that the difficulty in discharging caused by hardening is avoided.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
A process for treating iron slag of a steel plant by a tunnel kiln comprises the following steps:
s1, laying inert materials to the bottom of a tunnel kiln;
s2, uniformly mixing the iron slag of the steel mill with a cosolvent to prepare a green brick;
s3, placing the green brick into a dryer for drying, wherein the drying condition is drying for 6 hours at 110 ℃;
s4, the green bricks are loaded into a kiln car and pushed into a tunnel kiln, and CO or H is introduced2Firing, wherein the kiln inlet temperature is 100 ℃, the firing temperature is 850 ℃ and the temperature is kept for 30min, and the outlet temperature is 100 ℃;
s5, after the brick is taken out of the kiln, the green brick is crushed into small particles with the particle size of less than 0.07 mm.
The inert materials are quartz sand and slurry, and the mass ratio is 5:1.
the cosolvent is NaCl, BaO and B2O3The mass ratio is 5:1: 0.5.
Example 2
A process for treating iron slag of a steel plant by a tunnel kiln comprises the following steps:
s1, laying inert materials to the bottom of a tunnel kiln;
s2, uniformly mixing the iron slag of the steel mill with a cosolvent to prepare a green brick;
s3, placing the green brick into a dryer for drying, wherein the drying condition is drying for 12 hours at 200 ℃;
s4, placing the green bricks into a kiln car, pushing the green bricks into a tunnel kiln, introducing CO, firing, keeping the temperature of the kiln inlet at 200 ℃, the firing temperature at 900 ℃ for 60min, and keeping the temperature of the kiln outlet at 200 ℃;
s5, after the brick is taken out of the kiln, the green brick is crushed into small particles with the particle size of less than 0.07 mm.
The inert materials are quartz sand and slurry, and the mass ratio is 5: 2.
the cosolvent is NaCl, BaO and B2O3The mass ratio is 5:2: 1.5.
Example 3
A process for treating iron slag of a steel plant by a tunnel kiln comprises the following steps:
s1, laying inert materials to the bottom of a tunnel kiln;
s2, uniformly mixing the iron slag of the steel mill with a cosolvent to prepare a green brick;
s3, placing the green brick into a dryer for drying, wherein the drying condition is 125 ℃ for 8 hours;
s4, placing the green bricks into a kiln car, pushing the green bricks into a tunnel kiln, introducing CO, firing, keeping the temperature of the kiln inlet at 120 ℃, firing at 860 ℃ for 40min, and keeping the temperature of the kiln outlet at 120 ℃;
s5, after the brick is taken out of the kiln, the green brick is crushed into small particles with the particle size of less than 0.07 mm.
The inert materials are quartz sand and slurry, and the mass ratio is 5: 1.2.
the cosolvent is NaCl, BaO and B2O3The mass ratio is 5:1.2: 0.7.
Example 4
A process for treating iron slag of a steel plant by a tunnel kiln comprises the following steps:
s1, laying inert materials to the bottom of a tunnel kiln;
s2, uniformly mixing the iron slag of the steel mill with a cosolvent to prepare a green brick;
s3, placing the green brick into a dryer for drying, wherein the drying condition is 180 ℃ for 10 hours;
s4, placing the green bricks into a kiln car, pushing the green bricks into a tunnel kiln, and introducing H2Firing, wherein the kiln inlet temperature is 180 ℃, the firing temperature is 880 ℃, the temperature is kept for 50min, and the outlet temperature is 180 ℃;
s5, after the brick is taken out of the kiln, the green brick is crushed into small particles with the particle size of less than 0.07 mm.
The inert materials are quartz sand and slurry, and the mass ratio is 5: 1.8.
the cosolvent is NaCl, BaO and B2O3The mass ratio is 5:1.8: 1.2.
Example 5
A process for treating iron slag of a steel plant by a tunnel kiln comprises the following steps:
s1, laying inert materials to the bottom of a tunnel kiln;
s2, uniformly mixing the iron slag of the steel mill with a cosolvent to prepare a green brick;
s3, placing the green brick into a dryer for drying, wherein the drying condition is 160 ℃ for 9 hours;
s4, the green bricks are loaded into a kiln car and pushed into a tunnel kiln, and CO or H is introduced2Firing, wherein the kiln inlet temperature is 150 ℃, the firing temperature is 870 ℃, the temperature is kept for 45min, and the outlet temperature is 150 ℃;
s5, after the brick is taken out of the kiln, the green brick is crushed into small particles with the particle size of less than 0.07 mm.
The inert materials are quartz sand and slurry, and the mass ratio is 5: 1.5.
the cosolvent is NaCl, BaO and B2O3The mass ratio is 5:1.5: 1.
Comparative example 1 treatment according to patent ZL201310260486.8 "a high iron slag treatment Process
And (3) adjusting the pH value of the leachate by adding ammonia water, wherein the pH value of the primary deironing is 1.4, the pH value of the secondary deironing is 2.5, the secondary deironing slag reacts with 20% ammonium bisulfate solution at the reaction temperature of 60 ℃ for 0.5 hour, and the dissolved solution returns to the leaching process.
Test example 1
The iron slags of the steel works were treated according to the methods of examples 1 to 5 and comparative example 1 of the present invention, and the results are shown in Table 1.
TABLE 1
Compared with the prior art, the invention integrates two methods to solve the problems, firstly, cosolvent is added in the mixed material, and the cosolvent is preferentially mixed with SiO2Binding to high melting point minerals, thereby preventing SiO2Forming a low melting point mineral with ferrous oxide. The addition amount is 1 per mill-1%; and secondly, a layer of inert material with the thickness of about 0.5-1.0 cm is paved at the bottom of the kiln car. The inert materials do not generate any physical and chemical changes with the materials within the use temperature range, and the materials are prevented from contacting the bottom of the kiln car, so that the difficulty in discharging caused by hardening is avoided.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. A process for treating iron slag in a steel plant by using a tunnel kiln is characterized by comprising the following steps:
s1, laying inert materials to the bottom of a tunnel kiln;
s2, uniformly mixing the iron slag of the steel mill with a cosolvent to prepare a green brick;
s3, placing the green bricks into a dryer for drying;
s4, loading the green bricks into a kiln car, pushing the green bricks into a tunnel kiln, introducing reducing gas, and firing;
and S5, after the brick is taken out of the kiln, crushing the green brick into small particles.
2. The process for treating the iron slag of the steel mill by the tunnel kiln is characterized in that the inert materials are one or a mixture of quartz sand, soil, slurry, crushed stone and crushed brick.
3. The process for treating iron slag of steel plants by using tunnel kiln as claimed in claim 2, wherein the inert materials are quartz sand and slurry.
4. The process for treating iron slag of steel plants by using the tunnel kiln as claimed in claim 3, wherein the mass ratio of the quartz sand to the slurry is 5: (1-2).
5. The process for treating iron slag of steel mill with tunnel kiln as claimed in claim 1, wherein the cosolvent is selected from PbF2、BiF2、Cr2O3、BaO、B2O3One or more of NACl.
6. The process for treating iron slag of steel mill by tunnel kiln as claimed in claim 5, wherein the cosolvent is NaCl, BaO, B2O3The NaCl, BaO and B2O3The mass ratio of (1) - (2) to (0.5-1.5) is 5.
7. The process for treating iron slag of steel plant in tunnel kiln as claimed in claim 1, wherein the drying condition is 110-200 ℃ for 6-12 h.
8. The process for treating iron slag of steel plant in a tunnel kiln as claimed in claim 1, wherein the firing conditions of the tunnel kiln are that the kiln inlet temperature is 100-200 ℃, the firing temperature is 850-900 ℃ and the temperature is maintained for 30-60min, and the outlet temperature is 100-200 ℃.
9. The process for treating iron slag of steel plant by tunnel kiln as claimed in claim 1, wherein the reducing gas is CO or H2。
10. The process for treating iron slag of steel mill in tunnel kiln as claimed in claim 1, wherein the particle size of the small particles is less than 0.07 mm.
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| CN201911265323.2A CN112939572A (en) | 2019-12-11 | 2019-12-11 | Process for treating iron slag of steel plant by tunnel kiln |
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