CN109762984B - Treatment process method for sintering steel-making added sludge - Google Patents
Treatment process method for sintering steel-making added sludge Download PDFInfo
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Abstract
The invention discloses a treatment process method for adding steelmaking sludge by sintering, which takes iron ore powder and steelmaking sludge as main raw materials, limestone and dolomite as fluxes, coke powder and coal powder as fuels, steelmaking wastewater and clear water as added water, and adds the steelmaking sludge into a sintering process by adding bottom filter mud and sludge slurry, wherein the metallurgical property of the obtained sintered ore is that the softening starting temperature of the sintered ore can reach 1210 ℃, the softening temperature is 110 ℃, the reducibility can reach 78%, and the low-temperature reduction pulverization is 63%. The method has the advantages of improving the utilization rate of the sludge, fully utilizing water in the sludge treatment process, reducing the use amount of clear water, saving water resources, reducing the sintering production cost, improving the sintering air permeability, improving the yield and the like; the produced sintering ore has the advantages of soft melting performance, reducibility and low-temperature reduction pulverization, and meets the requirement of charging into a blast furnace; the sludge treatment cost is low, water resources are saved, the pollution of the steelmaking sludge to the environment is avoided, the process is simplified, and the method has great commercial potential value.
Description
Technical Field
The invention belongs to the field of iron ore powder sintering and resource recycling, and particularly relates to a scheme for reasonably proportioning steelmaking sludge added in a sintering process of a treatment process of adding the steelmaking sludge in sintering.
Background
The steelmaking wastewater is generated after wet dedusting of the converter, and the smoke dust contained in the wastewater is called steelmaking sludge. The steelmaking sludge contains 40-50% of iron content and valuable elements such as Ca and the like, so the recovery and utilization of the steelmaking sludge wastewater not only can save water resources, but also has great significance for the recovery and utilization of the valuable elements. Because the steelmaking wastewater has high alkalinity and high hardness, and the steelmaking sludge contained in the wastewater has fine granularity and high viscosity, the large-scale utilization of the steelmaking wastewater, especially the replacement of clear water and the reasonable addition of the steelmaking sludge wastewater are difficult points and hot points of the current research.
At present, the treatment process of adding steel-making sludge by sintering mainly comprises a mud cake method and a mud slurry method. However, in view of the current research progress, these methods mainly have the following disadvantages: (1) the sludge can be dehydrated to below 13 percent, the sludge has loose property, the transportation and the process production addition are easy to realize, but the sludge treatment time is long, the investment of manpower and material resources is large, the environmental pollution can be further expanded, and the utilization cost of the sludge is very high. (2) When the sludge is dehydrated to 30-40%, the treated sludge is not leaked in transportation, is not dusted in transportation and is beneficial to environmental maintenance, but the sludge has high viscosity, and is difficult to use common batching equipment during adding. Firstly, glue easily stifled discharge gate and join in marriage and add equipment, secondly the material glues a dispersity poor, and is inhomogeneous when participating in the batching, leads to the fact certain influence to production stability. (3) The steel-making sludge wastewater is added by adopting a slurry method, when the sludge concentration is low, the sludge amount used by sintering is small, and a large amount of sludge is easy to accumulate. When the sludge concentration is high, the blockage of pipelines and spray heads is easily caused.
For example, patent No. CN201220721798.5 discloses a recycling system for steel-making sludge, which comprises a coarse grain separator, a precipitator, a slurry tank, a slurry inlet pump and filter-press sludge, and is a process technique used after concentration treatment.
In view of this, it is necessary to provide a method which is simple in process, low in cost, environment-friendly and capable of efficiently utilizing the added steel-making sludge.
Disclosure of Invention
The invention aims to provide a treatment process for sintering steel-making added sludge aiming at the defects of the existing preparation method. The method has the advantages that (1) the utilization rate of the sludge can be improved; (2) the water in the sludge treatment process can be fully utilized, the use amount of clear water is reduced, and water resources are saved; (3) the sintering production cost can be reduced; (4) improve sintering air permeability and increase yield. The method is simple and easy to operate, controllable in experimental conditions, low in energy consumption and suitable for large-scale industrial production.
A process for treating the sludge generated by adding steel-smelting sludge in sintering mode features that the iron ore powder and steel-smelting sludge are used as main raw materials, limestone and dolomite are used as flux, coke powder and coal powder are used as fuel, the waste water and clean water from steel-smelting are used as water, and the sludge generated by adding bottom filter mud and sludge is added to sintering procedure, which includes:
(1) firstly, precipitating the converter steelmaking dedusting sewage generated by wet dedusting to sludge slurry with certain sludge concentration by a primary sedimentation tank and a secondary sedimentation tank;
(2) filter-pressing the sludge to a certain sludge concentration by a plate-and-frame filter press, and transporting the sludge to a storage bin by a dump truck;
(3) spraying the precipitated sludge slurry into the mixture through pipeline transportation and a spray head, and mixing and stirring;
(4) paving the mixture on a sintering machine trolley by adopting a bottom material paving process; firstly, adding sinter and less sludge as a bedding material, and then adding a mixture;
(5) igniting the surface of the material layer on the trolley and burning the material layer;
(6) accurately controlling sintering air quantity, vacuum degree, material layer thickness, machine speed and sintering end point to obtain corresponding sinter.
Further, the treatment process of adding the steel-making sludge in the sintering process is characterized in that the concentration of converter steel-making dedusting wastewater generated by wet dedusting is about 4-5%, and the sludge slurry with a certain concentration is about 25-30%.
Further, the treatment process of adding the steel-making sludge in the sintering process is characterized in that the certain sludge concentration in the step two is 60-70% for standby application.
Further, the treatment process of adding the steel-making sludge in the sintering process is characterized in that the steel-making wastewater added in the third step accounts for 7 percent, the first mixing time is 3min, and the second mixing time is adjusted by using clear water and is 3 min.
Further, the treatment process for adding the steel-making sludge in the sintering process is characterized in that in the fourth step, when the bottom material laying process is used, a layer of small sintered ore with the granularity of 10-25 mm and the thickness of 20-25 mm is laid as the bottom material before the mixture is laid, so that the purposes of protecting a grate, reducing the dust removal load and prolonging the service life of a fan rotor are achieved. The less sludge amount is about 3 to 4 percent of the mixture.
The treatment process for adding the steelmaking sludge in the sintering process is characterized in that the ignition time in the fifth step is usually 60 seconds, the ignition vacuum degree is 4-6 kpa, and the ignition depth is 10-20 mm.
The sintering is added with the steelmaking sludgeThe treatment process is characterized in that the sintering air quantity in the sixth step is about 3200m per ton of sintering ore air quantity3The vacuum degree is determined by the capability of a fan, the resistance of an air draft system, the air permeability of a material layer and the air leakage loss, the thickness of the material layer is generally 250-500 mm, the machine speed is controlled to be 1.5-4 m/min, and the sintering end point is the position of the trolley when the sintering process is completely finished.
Advantages and effects of the invention
The invention provides a treatment process for adding steelmaking sludge by sintering, which takes iron ore powder and steelmaking sludge as main raw materials, limestone and dolomite as fluxes, coke powder and coal powder as fuels, steelmaking wastewater and clear water as added water, and adds the steelmaking sludge into a sintering process by adding bottom filter mud and sludge slurry. The method has the advantages of improving the utilization rate of the sludge, fully utilizing water in the sludge treatment process, reducing the use amount of clear water, saving water resources, reducing the sintering production cost, improving the sintering air permeability, improving the yield and the like; the produced sintering ore has the advantages of soft melting performance, reducibility and low-temperature reduction pulverization, and meets the requirement of charging into a blast furnace; the sludge treatment cost is low, water resources are saved, the pollution of the steelmaking sludge to the environment is avoided, the process is simplified, and the method has great commercial potential value.
Drawings
FIG. 1 is a flow chart of a treatment process for adding steel-making sludge in sintering.
Detailed Description
The following further describes embodiments and effects of the present invention with reference to non-limiting examples.
Example 1
The converter steelmaking dust removal sewage generated by wet dust removal with the concentration of 4-5% is firstly precipitated to 10-30% of sludge slurry by a primary sedimentation tank and a secondary sedimentation tank. Then the sludge is filtered by a plate-and-frame filter press to 60 to 70 percent of sludge concentration and then is transported to a storage bin by a dump truck. Making the precipitated sludge into sludge with sludge concentration of 10%, and spraying into the mixture through pipeline transportation and spray head, wherein the steelmaking wastewater accounts for 7%, the first mixing time is 3min, and the second mixing time is adjusted by clear water and is 3 min. Before the mixture is spreadA layer of small sintered ore with the granularity of 10-25 mm and the thickness of 20-25 mm is used as a bedding material, a grab bucket machine is used for taking sludge, crushed sludge is added to the bedding material, the added sludge with the amount of about 3% -4% is used as the bedding material, the mixture is paved on a sintering trolley by adopting a bedding material technology, the surface of a material layer on the trolley is ignited, the ignition time is usually 60 seconds, the ignition vacuum degree is 4-6 kpa, and the ignition depth is 10-20 mm. The sintering air quantity is accurately controlled to be about 3200m per ton of sintering ore air quantity3The thickness of the material layer is generally 250 mm-500 mm, the machine speed is controlled at 1.5 m/min-4 m/min, and the sintering end point is reached.
Table 1 shows the concentration and composition ratio of the steel-making sludge and the metallurgical properties of the sinter in the first example, wherein the reducibility of the sinter is 78%, the softening starting temperature is 1210 ℃, the softening range is 110 ℃, and the reduction and pulverization are R6.3The content was 63%.
Example 2
The converter steelmaking dust removal sewage generated by wet dust removal with the concentration of 4-5% is firstly precipitated to 25-30% of sludge slurry by a primary sedimentation tank and a secondary sedimentation tank. Then the sludge is filtered by a plate-and-frame filter press to 60 to 70 percent of sludge concentration and then is transported to a storage bin by a dump truck. Preparing the precipitated sludge into sludge with the sludge concentration of 20%, and spraying the sludge into the mixture through pipeline transportation and a spray head, wherein the steelmaking wastewater accounts for 7%, the mixing time of the first mixing is 3min, and the mixing time of the second mixing is 3min by using clear water. Before distributing the mixture, paving a layer of small sintered ore with the granularity of 10-25 mm and the thickness of 20-25 mm as a bedding material, taking sludge by a grab bucket machine, adding crushed sludge onto the bedding material, taking the sludge with the amount of about 3% -4% of the added sludge as the bedding material, paving the mixture on a sintering trolley by adopting a bedding material technology, igniting the surface of a material layer on the trolley, wherein the ignition time is usually 60 seconds, the ignition vacuum degree is 4-6 kpa, and the ignition depth is 10-20 mm. The sintering air quantity is accurately controlled to be about 3200m per ton of sintering ore air quantity3The thickness of the material layer is generally 250 mm-500 mm, the machine speed is controlled at 1.5 m/min-4 m/min, and the sintering end point is reached.
Table 1 No. 2 shows the concentration of the steel-making sludge in the first embodimentProportioning and sintering metallurgical properties, wherein the reducibility of the prepared sintered ore is 77%, the softening starting temperature is 1205 ℃, the softening range is 113 ℃, and the low-temperature reduction pulverization is R6.3The content was 64%.
Example 3
The converter steelmaking dust removal sewage generated by wet dust removal with the concentration of 4-5% is firstly precipitated to 25-30% of sludge slurry by a primary sedimentation tank and a secondary sedimentation tank. Then the sludge is filtered by a plate-and-frame filter press to 60 to 70 percent of sludge concentration and then is transported to a storage bin by a dump truck. Making the precipitated sludge into sludge with sludge concentration of 30%, and spraying into the mixture through pipeline transportation and spray head, wherein the steelmaking wastewater accounts for 7%, the first mixing time is 3min, and the second mixing time is adjusted by clear water and is 3 min. Before distributing the mixture, paving a layer of small sintered ore with the granularity of 10-25 mm and the thickness of 20-25 mm as a bedding material, taking sludge by a grab bucket machine, adding crushed sludge onto the bedding material, taking the sludge with the amount of about 3% -4% of the added sludge as the bedding material, paving the mixture on a sintering trolley by adopting a bedding material technology, igniting the surface of a material layer on the trolley, wherein the ignition time is usually 60 seconds, the ignition vacuum degree is 4-6 kpa, and the ignition depth is 10-20 mm. The sintering air quantity is accurately controlled to be about 3200m per ton of sintering ore air quantity3The thickness of the material layer is generally 250 mm-500 mm, the machine speed is controlled at 1.5 m/min-4 m/min, and the sintering end point is reached.
Referring to Table 1, No. 3 shows the concentration and composition ratio of the steel-making sludge and the metallurgical properties of the sinter in the first embodiment, wherein the reducibility of the produced sinter is 76.5%, the softening starting temperature is 1203 ℃, the softening range is 115 ℃, and the reduction and pulverization are R at low temperature6.3The content was 65%.
Table 1 specific embodiment steelmaking sludge concentration (%)
Claims (5)
1. A process for treating the sludge generated by adding steel-smelting sludge in sintering mode features that the iron ore powder and steel-smelting sludge are used as main raw materials, limestone and dolomite are used as flux, coke powder and coal powder are used as fuel, the waste water and clean water from steel-smelting are used as water, and the sludge generated by adding bottom filter mud and sludge is added to sintering procedure, which includes:
(1) firstly, precipitating the converter steelmaking dedusting sewage generated by wet dedusting to sludge slurry with certain concentration by a primary sedimentation tank and a secondary sedimentation tank;
(2) filter-pressing the sludge to a certain sludge concentration by a plate-and-frame filter press, and transporting the sludge to a storage bin by a dump truck;
(3) spraying the precipitated sludge slurry into the mixture through pipeline transportation and a spray head, and mixing and stirring;
(4) paving the mixture on a sintering machine trolley by adopting a bottom material paving process; firstly, adding sinter and less bottom filter mud as a bedding material, and then adding a mixture;
(5) igniting the surface of the material layer on the trolley and burning the material layer;
(6) accurately controlling sintering air quantity, vacuum degree, material layer thickness, machine speed and sintering end point to obtain corresponding sinter;
the concentration of the converter steelmaking dedusting wastewater generated by wet dedusting is 4-5%, and the sludge slurry with a certain concentration is 25-30%;
the certain sludge concentration in the step two is 60-70%.
2. The method as claimed in claim 1, wherein the steelmaking sludge is added in the third step, the steelmaking wastewater is added in the third step, the first mixing time is 3min, the second mixing time is adjusted by clear water, and the mixing time is 3 min.
3. The method for treating sludge produced by adding steel in sintering as claimed in claim 1, wherein the particle size of sintered ore in the bedding material is 10-25 mm, and the thickness is 20-25 mm in the fourth step, so as to protect the grate, reduce the dust removal load, and prolong the service life of the fan rotor; the less sludge amount is 3 to 4 percent of the mixture.
4. The method for treating sludge produced during the addition of steel-making during the sintering process as claimed in claim 1, wherein the ignition time in the fifth step is 60 seconds, the ignition vacuum degree is 4kPa to 6kPa, and the ignition depth is 10mm to 20 mm.
5. The treatment process of sludge produced by adding steel-making during sintering as claimed in claim 1, wherein the air volume required for sintering in the sixth step is 3200m per ton of sintered ore3The vacuum degree is determined by the capability of a fan, the resistance of an air draft system, the air permeability of a material layer and the air leakage loss, the thickness of the material layer is 250-500 mm, the machine speed is controlled to be 1.5-4 m/min, and the sintering end point is the position of the trolley when the sintering process is completely finished.
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