CN114835327A - Method for cooperatively treating desulfurization wastewater and sintering machine head ash - Google Patents
Method for cooperatively treating desulfurization wastewater and sintering machine head ash Download PDFInfo
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Abstract
The invention discloses a method for cooperatively treating desulfurization wastewater and sintering machine head ash, which comprises the following steps: a. introducing the desulfurization wastewater into a regulating tank for water quality and water quantity regulation, and carrying out solid-liquid separation; b. b, performing deamination treatment on the waste liquid discharged after the treatment in the step a; c. b, shunting the waste liquid discharged after the treatment in the step b, wherein x% of the waste liquid discharged after the treatment in the step b is used for washing sintering machine dust, and performing post-treatment on (1-x%) of the waste liquid discharged after the treatment in the step b; d. in the step c, after the x% waste liquid discharged after the treatment in the step b is used for washing sintering machine head ash, carrying out solid-liquid separation; e. d, introducing the waste liquid discharged after the treatment in the step d into a regulating tank to be mixed with desulfurization waste water, and entering the water quality and water quantity regulating process and solid-liquid separation in the step a; the method can realize effective resource utilization and can solve the problem of ammonia nitrogen simultaneously.
Description
Technical Field
The invention relates to the field of industrial wastewater treatment, in particular to a method for cooperatively treating desulfurization wastewater and sintering machine head ash.
Background
The sintering machine head ash is smoke dust collected by an electric dust collector in the sintering process of raw materials such as iron ore and the like, has a certain iron content, and is directly returned to the sintering process for cyclic utilization in the traditional process; however, the sintering machine head ash contains high content of alkali metal, chlorine and the like, and direct reuse can cause the enrichment of harmful substances in the blast furnace and the formation of vicious circle, so as to cause the corrosion of the blast furnace wall and further influence the furnace life and the actual operation of the blast furnace; in addition, high-content substances such as potassium, chlorine and the like in the sintering machine head ash are potential potassium salt resources; in view of this, in order to realize efficient resource utilization, the sintering machine dust needs to be pretreated, harmful substances are removed, and then resource recovery is performed.
The prior art provides a water washing-solid-liquid separation-heavy metal removal-evaporative crystallization process, which realizes the recovery of resources such as potassium chloride and the like in the sintering machine head ash and simultaneously removes alkali metals; however, wet leaching not only consumes new industrial water, but also produces new industrial wastewater; in addition, the sintering machine head ash contains nitrides such as magnesium nitride and the like, ammonia gas can be generated in the wet leaching process and combined with water to form ammonia water, and the ammonia water enters an evaporation crystallization system and can be converted into ammonium chloride, so that the mother liquor is acidic, and equipment corrosion is caused; therefore, although the process realizes resource recycling, a set of wastewater treatment process is added, and the process has the potential problem of ammonia nitrogen pollution, and cannot realize effective resource utilization.
The desulfurization wastewater is high-salt-content wastewater, and in order to meet the requirement of zero emission of the whole plant, the desulfurization wastewater is treated and sodium salt is recovered by the conventional pretreatment, deep treatment and evaporative crystallization processes, and the wastewater treatment process is almost the same as the wastewater treatment process for cleaning the sintering machine head ash; based on the above, the method proposes that the desulfurization wastewater replaces industrial new water, the sintering machine head ash is washed by water, harmful substances in the sintering machine head ash are removed, and potassium chloride and sodium chloride are recovered, so that a set of wastewater treatment process is saved; however, this idea, while solving the water problem, exacerbates the ammonia problem; the desulfurization wastewater contains high ammonia nitrogen and sintering machine head ash is alkaline, so that a large amount of ammonia gas can be generated in the process of washing the sintering machine head ash by water to escape, and the generated ammonia water can cause serious influence on the subsequent evaporative crystallization process; in addition, the sintering machine head ash is flushed by the desulfurization wastewater with high ammonia nitrogen content, so that the sintering machine head ash has serious ammonia odor, and the quality of the sintering machine head ash is influenced; therefore, the process further realizes resource utilization, but aggravates the problem of ammonia nitrogen pollution.
In conclusion, the method for flushing sintering machine head ash by using desulfurization wastewater is a potential resource utilization method of wastes, but the removal of ammonia nitrogen is a difficult problem which hinders effective resource utilization, and simultaneously, the method is a contradictory problem: if ammonia nitrogen in the desulfurization wastewater is removed before the desulfurization wastewater flushes the sintering machine head ash, new ammonia nitrogen will be generated in the subsequent process of flushing the sintering machine head ash, and the ammonia nitrogen needs to be repeatedly treated, so that the process is repeated and the cost is increased; if ammonia nitrogen in water is removed after desulfurization wastewater flushes the sintering machine head ash, the washed sintering machine head ash has serious ammonia odor, and a large amount of ammonia gas escapes, so that the quality, the operation environment and the ecological environment of recycled ash are greatly influenced.
Therefore, in order to solve the above problems, a method for the synergistic treatment of desulfurization wastewater and sintering machine head ash, which can realize effective resource utilization and solve the ammonia nitrogen problem, is urgently needed.
Disclosure of Invention
In view of the above, the present invention aims to overcome the defects in the prior art, and provides a method for the synergistic treatment of desulfurization wastewater and sintering machine head ash, which can realize effective resource utilization and solve the problem of ammonia nitrogen; realizes the resource utilization of the desulfurization waste water and the sintering machine head ash, solves the problem of removing ammonia nitrogen in the process, and realizes the purpose of treating wastes with wastes in a green and environment-friendly way.
The invention discloses a method for cooperatively treating desulfurization wastewater and sintering machine head ash, which comprises the following steps:
a. introducing the desulfurization wastewater into a regulating tank to carry out a water quality and water quantity regulating procedure, and carrying out a solid-liquid separation procedure in a desulfurization process;
b. b, performing deamination treatment in a desulfurization process on the waste liquid discharged after the treatment in the step a;
c. b, shunting the waste liquid discharged after the treatment in the step b, wherein x% of the waste liquid discharged after the treatment in the step b is used for washing sintering machine dust, and (1-x%) of the waste liquid discharged after the treatment in the step b enters a post-treatment process in a desulfurization process;
d. in the step c, after the x% waste liquid discharged after the treatment in the step b is used for washing sintering machine head ash, a solid-liquid separation process in a sintering machine head ash treatment process is carried out;
e. and d, introducing the waste liquid discharged after the treatment in the step d into a regulating reservoir to be mixed with the desulfurization waste water, and entering the water quality and quantity regulating process in the step a and the solid-liquid separation process in the desulfurization process.
Further, in the step a, the water quality and quantity adjusting process includes: a is 1 And carrying out aeration treatment on the liquid in the regulating tank and carrying out primary solid-liquid separation.
Further, in the step a, the water quality and quantity adjusting process further includes: a is 2 For step a 1 Carrying out defluorination and hardness removal treatment on the waste liquid obtained by the first solid-liquid separation, and carrying out second solid-liquid separation; and c, finally performing step b on the waste liquid obtained in the second solid-liquid separation.
Further, in the step c, the post-treatment process includes: c. C 1 Carrying out a pH adjustment treatment process on the (1-x%) waste liquid discharged after the treatment in the step b, and carrying out solid-liquid separation for the third time; the pH value of the liquid after the pH adjusting treatment process is near neutral.
Further, in the step c, the post-treatment process further includes: c. C 2 For step c 1 And carrying out COD treatment on the waste liquid obtained by the third solid-liquid separation.
Further, in step c, the post-treatment process further includes: c. C 3 For step c 2 Adjusting the quality and quantity of the waste liquid after medium COD treatment; the water quality and quantity of the salt quantity have the function of adjusting to obtain mother liquor containing expected salt.
Further, in step c, the post-treatment process further includes: c. C 4 For step c 3 The mother liquor in (1) is crystallized to obtain the expected salt.
And step d further comprises a water washing tank and a filter pressing device, the sintering machine head ash and the x% waste liquid discharged after treatment in the step b are mixed in the water washing tank, the step e is carried out on the mixed waste liquid, and the mixed waste residue is treated by the filter pressing device.
Further, the adjusting tank has the function of controlling the output liquid quantity to stably enter the step b.
Further, the mixing ratio of the sintering machine head ash to the x% waste liquid discharged after the treatment in the step b is 1:1-1: 10.
The invention has the beneficial effects that: the invention discloses a method for the cooperative treatment of desulfurization wastewater and sintering machine head ash, which skillfully solves the problem of ammonia nitrogen removal by arranging an additional circulating process: the problems of ammonia odor, environmental pollution and the like of the recycling ash caused by directly using the desulfurization wastewater to wash the sintering machine head ash are avoided, and the problem of secondary removal of ammonia nitrogen caused by using the deamination desulfurization wastewater to wash the sintering machine head ash is solved.
Drawings
The invention is further described below with reference to the following figures and examples:
FIG. 1 is a schematic process flow diagram of the present invention.
Detailed Description
Fig. 1 is a schematic process flow diagram of the present invention, and as shown in the figure, the method for the synergistic treatment of desulfurization wastewater and sintering machine head ash in the present embodiment includes the following steps:
a. introducing the desulfurization wastewater into a regulating tank to carry out a water quality and water quantity regulating procedure, and carrying out a solid-liquid separation procedure in a desulfurization process; the regulating tank has the function of controlling the output liquid quantity to stably enter the step b, the water quality and quantity regulating process comprises the step of ensuring that the waste liquid discharged by the regulating tank is in a constant preset standard, and the solid-liquid separation process comprises the steps of filtering floating slag and suspended matters and filtering sediments;
in the step a, the water quality and quantity adjusting process comprises the following steps: a is 1 Carrying out aeration treatment on the liquid in the regulating tank, and carrying out primary solid-liquid separation; the primary solid-liquid separation is to treat and separate waste residues suspended or floating in the regulating tank;
in step a, the water quality and quantity adjusting process further comprises: a is 2 For step a 1 Carrying out defluorination and hardness removal treatment on the waste liquid obtained by the first solid-liquid separation to adjust the water quality; carrying out second solid-liquid separation; b, finally carrying out step b on the waste liquid obtained in the second solid-liquid separation; removing fluorine and hardness from the aerated desulfurization wastewater, and then standing and precipitating in a sedimentation tank; the second solid-liquid separation is to treat and separate the precipitated waste residues in a sedimentation tank, and further obtain waste liquid with regulated water quality to enter the next working procedure;
b. b, performing deamination treatment in a desulfurization process on the waste liquid discharged after treatment in the step a; the effluent of the sedimentation tank enters a deamination tank for ammonia removal treatment, including but not limited to ammonia removal by sodium chlorate, ammonia removal by a blowing method and the like; the deamination treatment process aims at reducing the ammonia content in the subsequent steps, reducing ammonia odor generated when the sintering machine head ash is washed, ensuring the quality of recycled ash and reducing pollution; further completely removing ammonia, and avoiding ammonia odor generated when the sintering machine head ash is washed;
c. b, shunting the waste liquid discharged after the treatment in the step b, wherein x% of the waste liquid discharged after the treatment in the step b is used for washing sintering machine dust, and (1-x%) of the waste liquid discharged after the treatment in the step b enters a post-treatment process in a desulfurization process; the mixing ratio of the sintering machine head ash to the x% waste liquid discharged after the treatment in the step b is 1:1-1: 10; furthermore, the mixing ratio of the sintering machine head ash to the x% waste liquid discharged after the treatment in the step b is 1:3-1: 8; more specifically, the mixing ratio (mass) of the sintering machine head ash and the x% waste liquid discharged after treatment in the step b is 1:3, the amount of the x% waste liquid discharged after treatment in the step b is determined according to the amount of the sintering machine head ash discharged in actual use, and the 1:3 mixing ratio can be selected to lock the useful ash in the mud cakes with high quality, so that the resource utilization rate is improved, the resource waste is reduced, and the effects of increasing the production and creating the income are achieved; part of effluent water (1-x%) after ammonia removal enters a pH regulating tank, and the rest part (x% of effluent water) is sent to a water washing tank;
in step c, the post-treatment process comprises: c. C 1 Carrying out a pH adjustment treatment process on the (1-x%) waste liquid discharged after the treatment in the step b, and carrying out solid-liquid separation for the third time; the effluent of the pH adjusting tank enters a filtering unit to filter impurities; the PH value of the liquid after the PH adjusting treatment process is near neutral; the pH adjusting treatment process adopts a corresponding mode to adjust according to the acidity and alkalinity of mother liquor during actual production, aims to obtain expected neutral liquid, or obtain weak acidic or weak alkaline liquid which deviates from the neutral state but the deviation value is not more than 0.5, is beneficial to the treatment of subsequent steps, and the third solid-liquid separation comprises the treatment and separation of suspended matters, colloids, precipitates and the like;
in step c, the post-treatment process further comprises: c. C 2 For step c 1 Carrying out COD treatment on the waste liquid obtained by the third solid-liquid separation; the filtered liquid is sent to a COD removal unit for treatment, including but not limited to advanced oxidation,Activated carbon filter adsorption, etc.;
in this step c, the post-treatment process further includes: c. C 3 For step c 2 Adjusting the quality and quantity of the waste liquid after medium COD treatment; the effluent of the COD removal unit is sent to a strong brine regulating tank for water quality and water quantity regulation; the water quality and quantity of the salt amount have the function of adjusting to obtain mother liquor containing expected salt; the contemplated salts are potassium chloride and sodium chloride;
in step c, the post-treatment process further comprises: c. C 4 For step c 3 Crystallizing the mother liquor to obtain expected salt; the effluent of the strong brine regulating tank is sent to an evaporation crystallization system for salt separation crystallization treatment;
d. in the step c, after the x% waste liquid discharged after the treatment in the step b is used for washing sintering machine head ash, a solid-liquid separation process in a sintering machine head ash treatment process is carried out; the other part of effluent (x% waste liquid) of the deamination pool is sent to a washing tank to be mixed, stirred and washed with sintering machine top ash; the water-ash mixture from the washing tank enters a filter pressing unit for solid-liquid separation;
and step d comprises a water washing tank and a filter pressing device, the sintering machine head ash and the x% waste liquid discharged after treatment in the step b are mixed in the water washing tank, the step e is carried out on the mixed waste liquid, and the mixed waste residue is treated by the filter pressing device.
e. And d, introducing the waste liquid discharged after the treatment in the step d into a regulating reservoir to be mixed with the desulfurization waste water, and entering the water quality and quantity regulating process in the step a and the solid-liquid separation process in the desulfurization process. Namely, the next circulation is carried out, the waste liquid for flushing the sintering machine head ash and the desulfurization waste water are mixed and adjusted, ammonia removal treatment is continuously carried out, the subsequent steps are completed, a single treatment process and a circulation treatment process are realized, the combination of two production processes is completed, the pollution is reduced, the site occupation is reduced, and the problems of low quality of the actually generated ammonia odor and recycled ash, poor operation environment, poor ecological environment and the like are solved; the effluent of the filter press is sent to an adjusting tank to be mixed with the desulfurization wastewater for adjustment, and the mud cakes separated by the filter press are recycled and sintered or sold for the outside.
In the embodiment, firstly, desulfurization wastewater enters a regulating tank for aeration treatment, then enters a defluorination and hardness removal unit and a sedimentation tank for defluorination and calcium and magnesium hardness removal, then enters a deamination tank for ammonia removal treatment, a part of water after ammonia removal enters a pH regulating tank for pH regulation, the other part of water is sent to a water washing tank, the water passing through the pH regulating tank is sent to a filtering unit for removing suspended matters, colloids and the like, the water passing through the filtering unit enters a COD removal unit for COD removal, the water passing through the COD removal unit enters a strong brine regulating tank for water quality and water quantity regulation, the effluent of the strong brine regulating tank is sent to an evaporative crystallization system for salt separation of potassium chloride and sodium chloride; the other part of the water sent to the washing tank is mixed, stirred and washed with sintering machine head ash, a water-ash mixture passing through the washing tank enters a filter press to be subjected to solid-liquid separation, the separated mud cakes enter a sintering and recycling way, the separated water is sent to an adjusting tank to be mixed with desulfurization wastewater, and then subsequent treatment is carried out, and a person skilled in the art can finish the scheme by simply assembling the existing equipment according to the flow and the steps, for example, the adjusting tank is provided with an aeration device, a wastewater lifting pump and a fan; the bottom of the defluorination and hardness removal mixing tank is provided with an underwater stirrer, and the sedimentation and concentration tank is an integrated dosing and concentration tank; the adjusting tank, the defluorination and hardness removal unit, the sedimentation tank and the deamination tank are provided with a uniform ammonia gas absorption device which comprises a gas collecting hood, a draught fan, an odor spray tower and a tail gas emission chimney; the deamination tank is communicated with the washing tank through a pump, and a pressure gauge and a flowmeter are arranged on the pump; corresponding to the above process, it will be understood by those skilled in the art that the details are not repeated herein; the desulfurization wastewater enters an adjusting tank to adjust the water quality and the water quantity and is aerated, then enters a defluorination and hardness removal unit and a sedimentation tank to remove the fluorine and hardness, then enters a deamination tank to remove ammonia, then a part of the wastewater enters a pH adjusting tank to adjust the pH, and the other part of the wastewater is sent to a washing tank, the water passing through the pH adjusting tank is sequentially sent to a filtering unit to remove suspended matters, colloids and the like, enters a COD removal unit to remove COD, then enters a strong brine adjusting tank to adjust the water quality and the water quantity, and finally is sent to an evaporative crystallization system to be subjected to salt separation of potassium chloride and sodium chloride; and the other part of the water sent to the water washing tank is mixed, stirred and washed with sintering machine head ash, then the mixture enters a filter press for solid-liquid separation, the separated mud cakes enter a sintering machine for recycling, and the separated water is sent to an adjusting tank to be mixed with the desulfurization wastewater for subsequent treatment.
The scheme discloses a method for cooperatively treating desulfurization wastewater and sintering machine head ash, which skillfully solves the problem of ammonia nitrogen removal by arranging an additional circulation process: the problems of ammonia odor of recycled ash, environmental pollution and the like caused by directly using the desulfurization wastewater to flush the sintering machine head ash are avoided, and the problem of secondary removal of ammonia nitrogen caused by using the deamination desulfurization wastewater to flush the sintering machine head ash is solved; the method specifically comprises the following steps: the desulfurization wastewater passes through a regulating reservoir, a fluorine and hardness removing and settling reservoir and then enters a deamination reservoir to remove ammonia, and part of water in the deamination wastewater is used for washing the sintering machine head ash, so that the influence of the desulfurization wastewater on the quality of the recycled ash, the operating environment and the ecological environment is greatly reduced; the water after flushing the sintering machine head ash returns to the initial regulating tank, then sequentially enters into the defluorination and hardness removal sedimentation tank and then enters into the deamination tank for ammonia removal, so that a deamination process unit is saved, the problem of secondary removal of ammonia nitrogen is solved, and the investment and operation cost is effectively reduced.
Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.
Claims (10)
1. A method for the cooperative treatment of desulfurization wastewater and sintering machine head ash is characterized in that: the method comprises the following steps:
a. introducing the desulfurization wastewater into a regulating tank to carry out a water quality and water quantity regulating procedure, and carrying out a solid-liquid separation procedure in a desulfurization process;
b. b, performing deamination treatment in a desulfurization process on the waste liquid discharged after the treatment in the step a;
c. b, shunting the waste liquid discharged after the treatment in the step b, wherein x% of the waste liquid discharged after the treatment in the step b is used for washing sintering machine dust, and (1-x%) of the waste liquid discharged after the treatment in the step b enters a post-treatment process in a desulfurization process;
d. in the step c, after the x% waste liquid discharged after the treatment in the step b is used for washing sintering machine head ash, a solid-liquid separation process in a sintering machine head ash treatment process is carried out;
e. and d, introducing the waste liquid discharged after the treatment in the step d into a regulating reservoir to be mixed with the desulfurization waste water, and entering the water quality and quantity regulating process in the step a and the solid-liquid separation process in the desulfurization process.
2. The method for the cooperative treatment of desulfurization waste water and sintering machine head ash according to claim 1, characterized in that: in the step a, the water quality and quantity adjusting process comprises the following steps: a is 1 And carrying out aeration treatment on the liquid in the regulating tank and carrying out primary solid-liquid separation.
3. The method for the cooperative treatment of desulfurization waste water and sintering machine head ash according to claim 2, characterized in that: in step a, the water quality and quantity adjusting process further comprises: a is 2 For step a 1 Carrying out defluorination and hardness removal treatment on the waste liquid obtained by the first solid-liquid separation, and carrying out second solid-liquid separation; and c, finally performing step b on the waste liquid obtained in the second solid-liquid separation.
4. The method for the cooperative treatment of desulfurization waste water and sintering machine head ash according to claim 3, characterized in that: in step c, the post-treatment process comprises: c. C 1 Carrying out a pH adjustment treatment process on the (1-x%) waste liquid discharged after the treatment in the step b, and carrying out solid-liquid separation for the third time; the pH value of the liquid after the pH adjusting treatment process is near neutral.
5. The method for the cooperative treatment of desulfurization waste water and sintering machine head ash according to claim 4, characterized in that: in step c, the post-treatment process further comprises: c. C 2 For step c 1 And carrying out COD treatment on the waste liquid obtained by the third solid-liquid separation.
6. The desulfurization waste of claim 5The method for the cooperative treatment of water and sintering machine head ash is characterized by comprising the following steps: in step c, the post-treatment process further comprises: c. C 3 For step c 2 Adjusting the quality and quantity of the waste liquid after medium COD treatment; the water quality and quantity of the salt quantity have the function of adjusting to obtain mother liquor containing expected salt.
7. The method for the cooperative treatment of desulfurization waste water and sintering machine head ash according to claim 6, characterized in that: in step c, the post-treatment process further comprises: c. C 4 For step c 3 The mother liquor in (1) is crystallized to obtain the expected salt.
8. The method for the cooperative treatment of desulfurization waste water and sintering machine head ash according to claim 1, characterized in that: and step d comprises a water washing tank and a filter pressing device, the sintering machine head ash and the x% waste liquid discharged after treatment in the step b are mixed in the water washing tank, the step e is carried out on the mixed waste liquid, and the mixed waste residue is treated by the filter pressing device.
9. The method for the cooperative treatment of desulfurization waste water and sintering machine head ash according to claim 1, characterized in that: the adjusting tank has the function of controlling the output liquid quantity to stably enter the step b.
10. The method for the synergistic treatment of desulfurization waste water and sintering machine head ash according to claim 1, characterized in that: and c, mixing the sintering machine head ash and the x% waste liquid discharged after the treatment in the step b in a ratio of 1:1-1: 10.
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| GB9115069D0 (en) * | 1990-07-13 | 1991-08-28 | Hitachi Shipbuilding Eng Co | Process for simultaneously effecting desulfurization and denitration within furnace |
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| CN112794520A (en) * | 2021-02-07 | 2021-05-14 | 中冶北方（大连）工程技术有限公司 | Steel wet desulphurization wastewater treatment system and method |
| CN113862462A (en) * | 2021-09-22 | 2021-12-31 | 日照卓业环保科技有限公司 | Method for joint dechlorination of sintering machine head ash and blast furnace cloth bag ash |
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Patent Citations (5)
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|---|---|---|---|---|
| GB9115069D0 (en) * | 1990-07-13 | 1991-08-28 | Hitachi Shipbuilding Eng Co | Process for simultaneously effecting desulfurization and denitration within furnace |
| CN111170543A (en) * | 2020-01-19 | 2020-05-19 | 青岛理工大学 | Desulfurization waste liquid recycling environment-friendly cooperative treatment system and method |
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| CN112794520A (en) * | 2021-02-07 | 2021-05-14 | 中冶北方（大连）工程技术有限公司 | Steel wet desulphurization wastewater treatment system and method |
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