CN213288099U

CN213288099U - Comprehensive water washing treatment system for dry ash and sintering dedusting ash of steel blast furnace

Info

Publication number: CN213288099U
Application number: CN202021591964.5U
Authority: CN
Inventors: 杨本涛; 肖祁春; 冯哲愚; 李佳; 童鸿
Original assignee: Hunan Zhongye Changtian Energy Conservation And Environmental Protection Technology Co ltd; Zhongye Changtian International Engineering Co Ltd
Current assignee: Hunan Zhongye Changtian Energy Conservation And Environmental Protection Technology Co ltd; Zhongye Changtian International Engineering Co Ltd
Priority date: 2020-08-04
Filing date: 2020-08-04
Publication date: 2021-05-28
Anticipated expiration: 2030-08-04

Abstract

The utility model discloses a water washing processing system is synthesized to iron and steel blast furnace dry process ash and sintering dust removal ash, this system comprises blast furnace dry process grey water washing system and sintering dust removal ash water washing system. Firstly, wet desulphurization salt-containing wastewater and/or activated carbon flue gas purification washing salt-containing wastewater is used as a washing water source of a blast furnace dry ash washing system. And (4) washing the sintering dust removal ash with the salt-containing wastewater discharged after the dry-method ash water washing of the blast furnace. Compare traditional running water washing scheme, this system adopts the salt solution to replace the running water, reduces the total amount of iron and steel high salt ash washing waste water from the source when guaranteeing effectively to get rid of chlorine, alkali metal in the iron and steel high salt ash, realizes the purpose of treating waste with the waste.

Description

Comprehensive water washing treatment system for dry ash and sintering dedusting ash of steel blast furnace

Technical Field

The utility model relates to a washing device is synthesized to iron and steel blast furnace dry process ash and sintering dust removal ash, concretely relates to washing processing system is synthesized to iron and steel blast furnace dry process ash and sintering dust removal ash belongs to iron and steel blast furnace high salt and gives up processing technology field admittedly.

Background

With the continuous promotion of a 'producing city integration' development mode, the steel industry gradually evolves towards a 'wastewater zero discharge, waste gas ultra-low discharge and solid waste non-discharge' coordinated mode. At present, the solid waste generated in the steel industry mainly contains iron, and most of the solid waste is subjected to in-plant circulation treatment through high-temperature furnaces such as sintering furnaces, rotary kilns and the like. Part of high-salt solid wastes (such as sintering three-electric-field ash, sintering four-electric-field ash, blast furnace cloth bag dedusting ash and the like) contain more alkali and chlorine metals, and if the high-salt solid wastes are directly sintered, the disadvantages of equipment corrosion, kiln caking and the like are caused.

At the present stage, alkali and chlorine metals are usually removed from high-salt solid wastes generated in steel plants by a water washing method, and a method for leaching blast furnace gas ash by using tap water is reported in Chinese patent CN103435073A, namely a method for producing potassium chloride by using blast furnace gas ash of steel enterprises, so that the content of potassium and chlorine in the blast furnace gas ash is greatly reduced, and the leachate is used for preparing potassium chloride and sodium chloride. Chinese patent CN101234766A method for producing potassium chloride by using sintered electric precipitator dust of iron and steel enterprises reports that the leaching rate of potassium and sodium can reach 95-99.5% by adopting a method for leaching the sintered precipitator dust by using a tap water and SDD inhibitor compound solution. The high-salt solid waste after washing and leaching is dehydrated and then can be returned to high-temperature furnaces such as sintering furnaces, rotary kilns and the like for further treatment. However, in the process of leaching high-salt solid waste by washing, a large amount of high-salt leaching waste water is generated and can be discharged after secondary treatment, thereby causing secondary pollution.

Considering that other processes in a steel plant generate wastewater containing salt (such as wet desulphurization wastewater, activated carbon flue gas purification washing wastewater and the like), the wastewater containing salt also needs to be treated before being discharged. And the main anion component in the salt-containing wastewater is similar to that of the high-salt leaching wastewater, and the cations in the salt-containing wastewater have the effect of removing the anions in the high-salt leaching wastewater. Therefore, if the salt-containing wastewater is used for replacing tap water to leach the high-salt solid waste, the total amount of the high-salt wastewater can be reduced, and the synergistic treatment of the salt-containing wastewater and the high-salt solid waste is realized. Chinese patent CN102992464B, "a disposal method of high-salt wastewater and waste incineration fly ash", reports a method for washing waste incineration fly ash by using high-salt wastewater, and realizes the cooperative disposal of solid and liquid wastes in the waste disposal industry by using water resources of the high-salt wastewater. Because the quality of the high-salt solid waste of steel and iron, the fly ash from waste incineration and the high-salt waste water in the waste industry are greatly different from the quality of the salt-containing waste water generated in other processes of the steel and iron plant, reference cannot be simply made, further research and optimization are needed, and no relevant research report exists at home and abroad at present.

SUMMERY OF THE UTILITY MODEL

To the not enough of prior art, the utility model provides an utilize the comprehensive treatment system at the water source that contains salt waste water that other processes of iron and steel factory produced as the solid useless (iron and steel blast furnace dry process ash and sintering dust removal ash) washing of high salt. Compared with the traditional water washing system, the system can reduce the consumption of tap water (industrial water) and reduce the yield of wastewater on one hand; and meanwhile, anions in the high-salinity leaching wastewater are removed by using cations in the saline wastewater, so that the purpose of treating the wastewater with waste is realized. On the other hand, by adding liquid caustic soda and a PAC (polyaluminium chloride) quenching and tempering device, the components of the salt-containing wastewater are changed, and the washing treatment effect of high-salt solid waste (iron and steel blast furnace dry ash and sintering dedusting ash) is improved. The system can reduce the treatment capacity of subsequent wastewater from the source, reduce the wastewater treatment cost and realize the reutilization of waste resources.

In order to achieve the above object, the utility model discloses the technical scheme who adopts specifically as follows:

a comprehensive water washing treatment system for iron and steel blast furnace dry ash and sintering dust comprises a blast furnace dry ash water washing system and a sintering dust washing system. The blast furnace dry ash washing system comprises a blast furnace dry ash bin, a blast furnace dry ash multistage countercurrent washing device and a liquid alkali conditioning device. The blast furnace dry ash bin is connected with the blast furnace dry ash multistage countercurrent washing device through a first pipeline. And the liquid caustic soda conditioning device is connected with the blast furnace dry ash multistage countercurrent washing device through a second pipeline. And the liquid caustic soda conditioning device is also connected with a liquid caustic soda conveying pipeline and a salt-containing wastewater conveying pipeline.

Preferably, the sintering dedusting ash washing system comprises a sintering dedusting ash bin, a sintering dedusting ash multistage countercurrent washing device and a PAC conditioning device. And the sintering dedusting ash bin is connected with the sintering dedusting ash multistage countercurrent water washing device through a third pipeline. And the PAC conditioning device is connected with the sintering dedusting ash multistage countercurrent water washing device through a fourth pipeline. And the PAC conditioning device is also connected with a PAC conveying pipeline.

Preferably, the blast furnace dry ash washing system is connected with the sintering dedusting ash washing system through a water conveying recycling pipeline.

Preferably, the salt-containing wastewater conveying pipeline is a wet desulphurization salt-containing wastewater conveying pipeline and/or an activated carbon flue gas purification washing salt-containing wastewater conveying pipeline.

Preferably, the blast furnace dry ash multistage countercurrent washing device comprises a blast furnace dry ash first-stage washing device, a blast furnace dry ash second-stage washing device and a blast furnace dry ash third-stage washing device. And the liquid caustic soda conditioning device is connected with the blast furnace dry ash first-stage water washing device through a second pipeline. And the first-stage blast furnace dry ash washing device is connected with the second-stage blast furnace dry ash washing device through a fifth pipeline. And the second-stage blast furnace dry ash washing device is connected with the third-stage blast furnace dry ash washing device through a sixth pipeline. And the blast furnace dry ash three-stage washing device is connected with the blast furnace dry ash two-stage washing device through a seventh pipeline.

Preferably, the system also comprises a blast furnace dry ash primary filter pressing device, a blast furnace dry ash secondary filter pressing device and a blast furnace dry ash tertiary filter pressing device. The blast furnace dry ash primary filter pressing device is arranged on the fifth pipeline. And the blast furnace dry ash secondary filter pressing device is arranged on the sixth pipeline. And the blast furnace dry ash three-stage filter pressing device is arranged on the seventh pipeline.

Preferably, the sintering dedusting ash multistage countercurrent washing device comprises a sintering dedusting ash first-stage washing device, a sintering dedusting ash second-stage washing device and a sintering dedusting ash third-stage washing device. And the PAC conditioning device is connected to the sintering dedusting ash first-stage water washing device through a fourth pipeline. Sintering dust removal ash one-level washing device is connected to sintering dust removal ash second grade washing device through eighth pipeline. And the sintering dedusting ash secondary washing device is connected to the sintering dedusting ash tertiary washing device through a ninth pipeline. And the sintering dedusting ash three-level washing device is connected to the sintering dedusting ash two-level washing device through a tenth pipeline.

Preferably, the system also comprises a sintering dedusting ash primary filter pressing device, a sintering dedusting ash secondary filter pressing device and a sintering dedusting ash tertiary filter pressing device. The sintering dust removal primary filter pressing device is arranged on the eighth pipeline. And the sintering dedusting ash secondary filter pressing device is arranged on the ninth pipeline. And the sintering dust removal three-stage filter pressing device is arranged on the tenth pipeline.

Preferably, the system also comprises a blast furnace dry ash first-level water washing tank, a blast furnace dry ash second-level water washing tank and a blast furnace dry ash third-level water washing tank. And a first bypass pipeline is led out from a fifth pipeline positioned at the downstream of the first-stage blast furnace dry ash filter pressing device and is connected with a first-stage blast furnace dry ash washing tank. And a second bypass pipeline is led out from a sixth pipeline positioned at the downstream of the blast furnace dry ash secondary filter pressing device and is connected with a blast furnace dry ash secondary washing tank. And the blast furnace dry ash three-stage washing tank is arranged on a seventh pipeline positioned at the downstream of the blast furnace dry ash three-stage filter pressing device.

Preferably, the system also comprises a first-level sintering dedusting ash washing tank, a second-level sintering dedusting ash washing tank and a third-level sintering dedusting ash washing tank. And a third bypass pipeline is led out from an eighth pipeline positioned at the downstream of the sintering dedusting ash first-stage filter pressing device and is connected to a sintering dedusting ash first-stage washing tank. And a fourth bypass pipeline is led out from a ninth pipeline positioned at the downstream of the sintering dedusting ash secondary filter pressing device and is connected to a sintering dedusting ash secondary washing tank. And the sintering dedusting ash three-level washing tank is arranged on a tenth pipeline positioned at the downstream of the sintering dedusting ash three-level filter pressing device.

Preferably, the system also comprises a blast furnace dry method ash sewage storage tank and a sintering dust removal ash sewage storage tank. And the first-level blast furnace dry ash washing tank is connected with the blast furnace dry ash sewage storage tank through an eleventh pipeline. And the sintering dedusting ash first-stage water washing tank is connected to the sintering dedusting ash sewage storage tank through a twelfth pipeline.

Preferably, the water conveying recycling pipeline comprises a first water conveying recycling pipeline and a second water conveying recycling pipeline. And a first water delivery and reuse pipeline of the blast furnace dry method ash sewage storage tank is connected to the PAC tempering device. And the blast furnace dry ash secondary washing tank is connected to the sintering dedusting ash secondary washing device through a second conveying and recycling pipeline and a tenth pipeline.

Preferably, a thirteenth pipeline is led out of the secondary sintering dedusting ash washing tank and is connected to the PAC conditioning device through a first water conveying and recycling pipeline.

Preferably, the system also comprises a blast furnace dry ash screw conveying device and a sintering dust removal screw conveying device. The blast furnace dry ash spiral conveying device is arranged on the first pipeline. And the sintering dust removal spiral conveying device is arranged on the third pipeline.

Preferably, the system also comprises a blast furnace dry ash filter cake storage tank and a sintering dust removal ash filter cake storage tank. And the blast furnace dry ash three-stage filter pressing device is connected with a blast furnace dry ash filter cake storage tank through a fourteenth pipeline. And the sintering dedusting ash three-stage pressure filtration device is connected to a sintering dedusting ash filter cake storage tank through a fifteenth pipeline.

Preferably, the fourteenth duct is a bypass duct of the seventh duct. The fifteenth pipe is a bypass pipe of the tenth pipe.

Preferably, the blast furnace dry ash tertiary washing device is also connected with a first industrial water conveying pipeline. And the sintering dust removal three-level washing device is also connected with a second industrial water conveying pipeline.

In the prior art, aiming at high-salt solid waste (mainly containing iron) generated in steel plants, most of the solid waste is subjected to internal circulation treatment in the steel plants through sintering, blast furnaces, rotary kilns and other high-temperature furnaces. However, part of high-salt solid wastes (such as three-field sintering ash, four-field sintering ash, bag-type blast furnace dust, etc.) contain more alkali and chlorine metals, and if the wastes are directly returned to high-temperature furnaces such as sintering furnaces, rotary kilns, etc., the wastes can cause equipment corrosion and cause kiln caking, etc. Therefore, the alkali and chlorine metal are usually removed from the part of the high-salinity solid waste by water washing. Therefore, a large amount of high-salt leaching wastewater is generated, and a large amount of tap water (industrial water) is consumed, so that the water resource is greatly consumed. Further, the high-salt leaching wastewater can be discharged after secondary treatment, which causes secondary pollution.

The utility model discloses in, can produce through other processes with the steel plant and contain salt waste water (like wet flue gas desulfurization waste water, active carbon gas cleaning washing waste water etc.) and replace the running water and carry out the leaching that the high salt was useless admittedly, and then reduce the use amount of running water, reduced the total amount that the high salt leached out waste water, realize containing salt waste water and the purpose of the useless cooperation of handling of high salt solid.

In the utility model discloses in, this scheme the system is through adopting the multistage washing mode of establishing ties (in the utility model discloses, the water ash mass ratio of blast furnace dry process ash one-level washing, second grade washing, tertiary washing be 1:1 ~ 3, preferably 1: 1. further, the one-level water ash ratio of sintering dust removal ash, washing is 1:2 ~ 4, preferably 1:3 ~ 4. the second grade water ash ratio of sintering dust removal ash washing is 1:2 ~ 4, preferably 1:1 ~ 2. the tertiary water ash ratio of sintering dust removal ash washing is 1:1 ~ 2, preferably 1: 1). Wherein, the first-stage water source of the blast furnace dry ash is salt-containing water after liquid alkali tempering. And (3) after the first-stage washing of the blast furnace dry ash is finished, dehydrating the blast furnace dry ash by first-stage filter pressing, discharging the first-stage filtrate of the blast furnace dry ash to a blast furnace dry ash sewage storage tank (conveying the filtrate to a sintering dedusting ash washing system), and allowing filter residues to enter the second-stage washing of the blast furnace dry ash. The second-stage water washing source of the blast furnace dry ash is the third-stage filter pressing water production of the blast furnace dry ash. And (2) after the second-stage washing of the blast furnace dry ash is finished, dewatering by second-stage filter pressing of the blast furnace dry ash, conveying the second-stage filtrate of the blast furnace dry ash to the first-stage washing of the blast furnace dry ash (or conveying the second-stage filtrate to a sintering dedusting ash washing system), and allowing filter residues to enter third-stage washing. And the third-stage water washing source of the blast furnace dry ash is industrial water, after the third-stage water washing of the blast furnace dry ash is finished, the third-stage filter pressing of the blast furnace dry ash is used for dewatering, the third filtrate of the blast furnace dry ash is discharged to the second-stage water washing of the blast furnace dry ash for recycling, and the filter residue is discharged from the system and transported outside for disposal. The water containing salt water after the liquid caustic soda conditioning is used as a water source for the first-stage water washing of the blast furnace dry ash.

Further, the primary water washing source of the sintering dedusting ash is salt-containing water after PAC tempering (the salt-containing water is primary filter pressing water produced by the blast furnace dry ash). And after the primary washing of the sintering dedusting ash is finished, dehydrating the sintering dedusting ash through primary filter pressing, discharging primary filtrate of the sintering dedusting ash to a sintering dedusting ash sewage storage tank (discharging after sewage treatment separately), and enabling filter residues to enter the secondary washing of the sintering dedusting ash. The second-stage washing water source of the sintering dedusting ash is the third-stage filter pressing water production of the sintering dedusting ash and the second-stage filter pressing water production of the blast furnace dry ash. And after the secondary washing of the sintering dedusting ash is finished, dehydrating through secondary filter pressing of the sintering dedusting ash, conveying the secondary filtrate of the sintering dedusting ash to the primary washing of the sintering dedusting ash, and washing filter residues into a tertiary washing. And a third-stage water washing source of the sintering dedusting ash is industrial water, after the third-stage water washing of the sintering dedusting ash is completed, the sintering dedusting ash is dewatered through third-stage filter pressing, three filtrate of the sintering dedusting ash is discharged to second-stage water washing of the sintering dedusting ash for recycling, and filter residues are discharged from the system and transported to an external disposal (for example, conveyed to a rotary kiln or a sintering furnace for treatment).

The method is characterized in that saline water after liquid caustic soda conditioning is used as a water source of primary washing of blast furnace dry ash, the saline water after PAC conditioning (the saline water is primary filter pressing water produced by the blast furnace dry ash) is used as a primary washing water source of sintering dedusting ash, and a multi-stage countercurrent washing mode is adopted (primary filter pressing filtrate of the blast furnace dry ash and secondary filter pressing filtrate of the blast furnace dry ash are both used as water sources of a sintering dedusting ash washing system, tertiary filter pressing filtrate of the blast furnace dry ash returns to secondary washing of the blast furnace dry ash, and tertiary filter pressing filtrate of the sintering dedusting ash returns to secondary washing of the sintering dedusting ash) so as to further reduce the using amount of tap water during washing, and replace tap water with the secondary filter pressing filtrate of the saline water after liquid caustic soda conditioning and the blast furnace ash, even not need to use tap water (industrial water) during the primary washing of the blast furnace ash, further, primary filter pressing water produced by adopting the PAC (polyaluminium chloride) quenched and tempered blast furnace dry ash is used as a primary washing water source for sintering dedusting ash; therefore, tap water (industrial water) is not needed to be used in the primary washing of the sintering dedusting ash, the two items are combined, the final waste water amount is greatly reduced, and the subsequent waste water treatment cost is reduced. The comprehensive treatment of waste water in different procedures in the steel technology is realized by using waste to treat waste.

The utility model discloses in, mainly contain calcium ion, chlorine, sulfate radical and sulfite ion in the wet flue gas desulfurization waste water, active carbon gas cleaning washing waste water mainly contains metal ion, chlorine, sulfate radical and sulfite ion. The two kinds of waste water are high-chlorine low-sulfate radical waste water. And the water for leaching the high-salt ash by adopting the tap water is also complex wastewater with high chlorine and low sulfate radical, and through concentration comparison analysis, the concentration of each ion in the leaching wastewater of the high-salt ash is far higher than the corresponding ion concentration in the wet desulphurization wastewater and the activated carbon flue gas purification washing wastewater. Therefore, the leachate of high-salinity ash is prepared by adopting saline water (wet desulphurization wastewater and activated carbon flue gas purification washing wastewater), so that the final water quality is not greatly changed, the aim of treating waste by waste can be fulfilled, and the final wastewater yield is reduced.

The utility model discloses in, adopt the alkali lye (liquid alkali is one or more in sodium hydroxide, potassium hydroxide, the lithium hydroxide) to carry out quenching and tempering with salt-containing water, be in order to prevent that acid water from making a large amount of valuable metals leach in the high salt ash, the water that the running water leached the high salt ash is the faintly acid. Therefore, a certain amount of alkali needs to be added into the saline water to adjust the saline water to be alkalescent (the pH value of the saline water is adjusted to 7-9, preferably 7.2-8.8) so as to prevent valuable metals such as iron and the like from being leached out.

The utility model discloses in, with the one-level washing water source of water conduct sintering dust removal ash is produced to the one-level washing filter-pressing of blast furnace dry process ash, realized "a water is dual-purpose, with the useless purpose of treating waste", need not additionally increase the step that the running water carries out the washing to sintering dust removal ash promptly, avoided the waste of water resource and reduced the output of final waste water volume. Meanwhile, a certain amount of PAC is added into the primary washing and filter pressing water of the blast furnace dry ash for adjustment, so that the coagulation aiding function of the PAC is utilized to improve the coagulation capability of the washing ash, thereby being beneficial to the subsequent filter pressing. In addition, aluminum in the PAC reacts with calcium in the saline water and sulfate radicals in the ash washing water to generate insoluble precipitates, so that the concentration of the sulfate radicals in the final effluent is reduced, and the difficulty of the subsequent salt separation crystallization operation is reduced.

The utility model discloses in, the mode that adopts tertiary step filter-pressing filters washing filter residue at different levels. Conventional filter pressing methods often only consider cake dewatering to be of concern, with higher dewatering being considered better. But for practical engineering, the three-stage washing efficiency is higher, and the chlorine content in the final filter residue can be ensured to meet the limit requirement only by improving the last stage of filter pressing. And the dehydration rate of the first two stages of filter pressing is adjusted, so that the discharge of the total amount of wastewater can be reduced while the chlorine and alkali metals in the high-salt ash are effectively removed. The utility model discloses in, the one-level filter-pressing dehydration of blast furnace dry process ash or sintering dust removal ash, the dehydration rate control is at 20 ~ 60%, preferably 40 ~ 50%. The secondary filter pressing dehydration of the blast furnace dry ash or the sintering dedusting ash is carried out, and the dehydration rate is controlled to be 20-60%, preferably 40-50%. The three-stage filter pressing dehydration of the blast furnace dry ash or the sintering dedusting ash is controlled to be 70-90%, preferably 80-85%.

Compared with the prior art, the utility model discloses a beneficial technological effect as follows:

1. the utility model discloses an effectively utilize the nature of salt-containing water, improve the washing scheme of the high salt ash of steel, when chlorine, alkali metal effectively got rid of in the high salt ash of barrier (blast furnace dry process ash and sintering dust removal ash), still reduce the total amount of high salt ash washing waste water from the source, reach the purpose of treating waste with the useless.

2. The utility model discloses a carry out the quenching and tempering to raw water (contain salt waste water) when adopting liquid caustic soda washing, prevent that acidity is too high and make valuable metal leach for can remain of valuable metal among the washing process, can also reduce the sulfate radical concentration of final high salt ash washing waste water.

3. The utility model discloses a carry out effective combination with blast furnace dry process grey water washing system and sintering dust removal ash washing system, utilize blast furnace dry process grey washing system's waste water as sintering dust removal ash washing system's water source, further realized treating waste with waste, reduce the purpose of the waste of water resource, simultaneously still very big reduction the emission of final waste water total amount. The cost pressure of subsequent wastewater treatment is reduced.

4. The utility model discloses chlorine, alkali metal content in the high salt ash in the reducible system exhaust waste water are favorable to retrieving high-purity sodium chloride and potassium chloride in this waste water in the follow-up waste water treatment process.

Drawings

FIG. 1 is a schematic structural view of a comprehensive water washing treatment system for dry ash and sintering dust removal ash of a steel blast furnace.

FIG. 2 is a schematic diagram of a multistage countercurrent washing structure of a comprehensive washing treatment system for dry ash and sintering dust removal ash of a steel blast furnace.

FIG. 3 is a flow chart of a process of applying the conventional water washing in example 1.

FIG. 4 is a flow chart of a process employing the conventional cascade pressure filtration of example 1.

FIG. 5 is a flow chart of the process using example 15 in application example 1.

Reference numerals: a, a blast furnace dry-method ash-water washing system; b: a sintering dust removal ash washing system; h: a water delivery reuse pipeline; 1: a blast furnace dry ash bin; 2: a blast furnace dry ash multistage countercurrent washing device; 3: a liquid caustic soda conditioning device; 4: sintering the dust removal ash bin; 5: a multistage countercurrent washing device for sintering dust removal ash; 6: a PAC conditioning device; 7: a blast furnace dry ash spiral conveying device; 8: sintering dust removal spiral conveying device; 201: a blast furnace dry ash first-stage water washing device; 202: a second-stage blast furnace ash washing device; 203: a blast furnace dry ash three-stage washing device; 204: a blast furnace dry ash primary filter pressing device; 205: a blast furnace dry ash secondary filter pressing device; 206: a blast furnace dry ash three-stage filter pressing device; 207: a first-grade blast furnace dry ash washing tank; 208: a second-stage washing tank for dry ash of the blast furnace; 209: a blast furnace dry ash three-stage washing tank; 210: a blast furnace dry method ash and sewage storage tank; 211: a blast furnace dry ash filter cake storage tank; 301: a liquid caustic soda delivery pipeline; 302: a salt-containing wastewater conveying pipeline; 501: sintering dust removal primary washing device; 502: sintering dust removal two-stage washing device; 503: sintering dust removal three-level washing device; 504: sintering dust removal primary filter pressing device; 505: sintering dust removal two-stage filter pressing device; 506: sintering dust removal three-stage filter pressing device; 507: sintering dedusting ash first-stage washing tank; 508: sintering dust removal two-stage washing tank; 509: sintering dust removal three-stage washing tank; 510: a sintering dust removal ash sewage storage tank; 511: a storage tank for sintering dedusting ash filter cakes; 601: a PAC delivery conduit; l1: a first conduit; l2: a second conduit; l3: a third pipeline; l4: a fourth conduit; l5: a fifth pipeline; l6: a sixth pipeline; l7: a seventh pipe; l8: an eighth conduit; l9: a ninth conduit; l10: a tenth lane; l11: an eleventh pipe; l12: a twelfth duct; l13: a thirteenth pipe; l14: a fourteenth pipe; l15: a fifteenth conduit; h1: a first water delivery and reuse pipeline; h2: a second water delivery and reuse pipeline; p1: a first bypass conduit; p2: a second bypass conduit; p3: a third bypass conduit; p4: a fourth bypass conduit; s1: a first industrial water delivery conduit; s2: a second industrial water delivery conduit.

Detailed Description

The technical solution of the present invention is illustrated below, and the claimed scope of the present invention includes, but is not limited to, the following examples.

A comprehensive water washing treatment system for iron and steel blast furnace dry ash and sintering fly ash comprises a blast furnace dry ash water washing system A and a sintering fly ash water washing system B. The blast furnace dry ash washing system A comprises a blast furnace dry ash bin 1, a blast furnace dry ash multistage countercurrent washing device 2 and a liquid alkali conditioning device 3. The blast furnace dry ash bin 1 is connected with a blast furnace dry ash multistage countercurrent washing device 2 through a first pipeline L1. And the liquid caustic soda conditioning device 3 is connected with the blast furnace dry ash multistage countercurrent washing device 2 through a second pipeline L2. And the liquid caustic soda conditioning device 3 is also connected with a liquid caustic soda conveying pipeline 301 and a salt-containing wastewater conveying pipeline 302.

Preferably, the sintering dedusting ash washing system B comprises a sintering dedusting ash bin 4, a sintering dedusting ash multistage countercurrent washing device 5 and a PAC conditioning device 6. The sintering dedusting ash bin 4 is connected with the sintering dedusting ash multistage countercurrent water washing device 5 through a third pipeline L3. The PAC conditioning device 6 is connected with the sintering dedusting ash multistage countercurrent water washing device 5 through a fourth pipeline L4. The PAC conditioning device 6 is also connected with a PAC conveying pipeline 601.

Preferably, the blast furnace dry ash washing system A is connected with the sintering and dedusting ash washing system B through a water conveying and recycling pipeline H.

Preferably, the salt-containing wastewater conveying pipeline 302 is a wet desulphurization salt-containing wastewater conveying pipeline and/or an activated carbon flue gas purification washing salt-containing wastewater conveying pipeline.

Preferably, the blast furnace dry ash multistage countercurrent washing device 2 comprises a blast furnace dry ash first-stage washing device 201, a blast furnace dry ash second-stage washing device 202 and a blast furnace dry ash third-stage washing device 203. The liquid caustic soda conditioning device 3 is connected to the blast furnace dry ash first-stage water washing device 201 through a second pipeline L2. The blast furnace dry ash primary water washing device 201 is connected to the blast furnace dry ash secondary water washing device 202 through a fifth pipeline L5. The blast furnace dry ash secondary washing device 202 is connected to the blast furnace dry ash tertiary washing device 203 through a sixth pipe L6. The blast furnace dry ash tertiary water washing device 203 is connected to the blast furnace dry ash secondary water washing device 202 through a seventh pipeline L7.

Preferably, the system further comprises a blast furnace dry ash primary filter pressing device 204, a blast furnace dry ash secondary filter pressing device 205 and a blast furnace dry ash tertiary filter pressing device 206. The blast furnace dry ash primary filter pressing device 204 is arranged on a fifth pipeline L5. The blast furnace dry ash secondary filter pressing device 205 is arranged on a sixth pipeline L6. The blast furnace dry ash three-stage filter pressing device 206 is arranged on a seventh pipeline L7.

Preferably, the multistage countercurrent water washing device 5 for the sintering dust removal ash comprises a first stage water washing device 501 for the sintering dust removal ash, a second stage water washing device 502 for the sintering dust removal ash and a third stage water washing device 503 for the sintering dust removal ash. The PAC conditioning device 6 is connected to the sintering dedusting ash first-stage water washing device 501 through a fourth pipeline L4. The first-stage sintered dedusting ash washing device 501 is connected to the second-stage sintered dedusting ash washing device 502 through an eighth pipeline L8. The second sintered precipitator dust washing apparatus 502 is connected to the third sintered precipitator dust washing apparatus 503 through a ninth pipe L9. The third sintered dust-removing ash water washing device 503 is connected to the second sintered dust-removing ash water washing device 502 through a tenth pipe L10.

Preferably, the system further comprises a first-stage sintering dust-removal pressure filter device 504, a second-stage sintering dust-removal pressure filter device 505 and a third-stage sintering dust-removal pressure filter device 506. The first-stage sintered dedusting ash filter pressing device 504 is arranged on the eighth pipeline L8. The sintering dust removal secondary filter pressing device 505 is arranged on a ninth pipeline L9. The sintering dust-removing three-stage filter pressing device 506 is arranged on the tenth pipeline L10.

Preferably, the system also comprises a blast furnace dry ash first-stage water washing tank 207, a blast furnace dry ash second-stage water washing tank 208 and a blast furnace dry ash third-stage water washing tank 209. A first bypass pipeline P1 is led out of the fifth pipeline L5 positioned at the downstream of the blast furnace dry ash primary filter pressing device 204 and is connected with the blast furnace dry ash primary water washing tank 207. A second bypass pipeline P2 is led out of the sixth pipeline L6 positioned at the downstream of the blast furnace dry ash secondary filter pressing device 205 and is connected with the blast furnace dry ash secondary water washing tank 208. The blast furnace dry ash three-stage washing tank 209 is arranged on a seventh pipeline L7 positioned at the downstream of the blast furnace dry ash three-stage filter pressing device 206.

Preferably, the system further comprises a first-stage sintered fly ash water washing tank 507, a second-stage sintered fly ash water washing tank 508 and a third-stage sintered fly ash water washing tank 509. A third bypass pipeline P3 is led out from the eighth pipeline L8 positioned at the downstream of the first-stage sintering dust-removing pressure filter device 504 and is connected to a first-stage sintering dust-removing water washing tank 507. A fourth bypass pipeline P4 is led out from the ninth pipeline L9 positioned at the downstream of the second-stage sintering dust-removing filter pressing device 505 and is connected to the second-stage sintering dust-removing water washing tank 508. The sintered fly ash tertiary water wash tank 509 is disposed on a tenth conduit L10 located downstream of the sintered fly ash tertiary filter press apparatus 506.

Preferably, the system further comprises a blast furnace dry ash sewage storage tank 210 and a sintered dust removal ash sewage storage tank 510. The blast furnace dry ash primary water washing tank 207 is connected to the blast furnace dry ash sewage storage tank 210 through an eleventh pipe L11. The first-stage sintered dust-removal water washing tank 507 is connected to the sewage storage tank 510 for sintered dust-removal ash through a twelfth pipe L12.

Preferably, the water reuse pipeline H comprises a first water reuse pipeline H1 and a second conveying reuse pipeline H2. The first water delivery and reuse pipeline H1 of the blast furnace dry ash and sewage storage tank 210 is connected to the PAC tempering device 6. The blast furnace dry ash secondary water washing tank 208 is connected to the second sinter fly ash secondary water washing apparatus 502 through a second delivery return pipe H2 and via a tenth pipe L10.

Preferably, a thirteenth pipeline L13 is further led out from the secondary water washing tank 508 of the sintering dust removal ash and is connected to the PAC tempering device 6 through a first water conveying and reusing pipeline H1.

Preferably, the system also comprises a blast furnace dry ash spiral conveying device 7 and a sintering dust removal spiral conveying device 8. The blast furnace dry ash screw conveyor 7 is arranged on the first pipeline L1. The sintering dust removal spiral conveying device 8 is arranged on the third pipeline L3.

Preferably, the system further comprises a blast furnace dry ash cake storage tank 211 and a sintered fly ash cake storage tank 511. The blast furnace dry ash three-stage pressure filtration device 206 is connected to a blast furnace dry ash cake storage tank 211 through a fourteenth pipe L14. The sintered fly ash three-stage filter pressing device 506 is connected to the sintered fly ash filter cake storage tank 511 through a fifteenth pipeline L15.

Preferably, the fourteenth line L14 is a bypass line of the seventh line L7. The fifteenth conduit L15 is a bypass conduit of the tenth conduit L10.

Preferably, a first industrial water conveying pipeline S1 is further connected to the blast furnace dry ash tertiary washing device 203. And a second industrial water conveying pipeline S2 is also connected to the sintering dust removal three-stage water washing device 503.

Example 1

As shown in figure 1, the comprehensive water washing treatment system for the dry blast furnace ash and the sintered fly ash comprises a water washing system A for the dry blast furnace ash and a water washing system B for the sintered fly ash. The blast furnace dry ash washing system A comprises a blast furnace dry ash bin 1, a blast furnace dry ash multistage countercurrent washing device 2 and a liquid alkali conditioning device 3. The blast furnace dry ash bin 1 is connected with a blast furnace dry ash multistage countercurrent washing device 2 through a first pipeline L1. And the liquid caustic soda conditioning device 3 is connected with the blast furnace dry ash multistage countercurrent washing device 2 through a second pipeline L2. And the liquid caustic soda conditioning device 3 is also connected with a liquid caustic soda conveying pipeline 301 and a salt-containing wastewater conveying pipeline 302.

And the sintering dedusting ash washing system B comprises a sintering dedusting ash bin 4, a sintering dedusting ash multistage countercurrent washing device 5 and a PAC conditioning device 6. The sintering dedusting ash bin 4 is connected with the sintering dedusting ash multistage countercurrent water washing device 5 through a third pipeline L3. The PAC conditioning device 6 is connected with the sintering dedusting ash multistage countercurrent water washing device 5 through a fourth pipeline L4. The PAC conditioning device 6 is also connected with a PAC conveying pipeline 601.

And the blast furnace dry ash washing system A is connected with the sintering dedusting ash washing system B through a water delivery recycling pipeline H.

Example 2

Example 1 was repeated except that the saline wastewater transfer line 302 was a wet desulfurization saline wastewater transfer line and an activated carbon flue gas cleaning scrubbing saline wastewater transfer line.

Example 3

Example 2 was repeated, and as shown in fig. 2, the blast furnace dry ash multistage countercurrent water washing device 2 comprises a blast furnace dry ash primary water washing device 201, a blast furnace dry ash secondary water washing device 202 and a blast furnace dry ash tertiary water washing device 203. The liquid caustic soda conditioning device 3 is connected to the blast furnace dry ash first-stage water washing device 201 through a second pipeline L2. The blast furnace dry ash primary water washing device 201 is connected to the blast furnace dry ash secondary water washing device 202 through a fifth pipeline L5. The blast furnace dry ash secondary washing device 202 is connected to the blast furnace dry ash tertiary washing device 203 through a sixth pipe L6. The blast furnace dry ash tertiary water washing device 203 is connected to the blast furnace dry ash secondary water washing device 202 through a seventh pipeline L7.

Example 4

Example 3 was repeated except that the system further included a blast furnace dry ash primary filter press 204, a blast furnace dry ash secondary filter press 205, and a blast furnace dry ash tertiary filter press 206. The blast furnace dry ash primary filter pressing device 204 is arranged on a fifth pipeline L5. The blast furnace dry ash secondary filter pressing device 205 is arranged on a sixth pipeline L6. The blast furnace dry ash three-stage filter pressing device 206 is arranged on a seventh pipeline L7.

Example 5

Example 4 is repeated, and the multistage countercurrent washing device 5 for sintering dust removal comprises a first-stage sintering dust removal washing device 501, a second-stage sintering dust removal washing device 502 and a third-stage sintering dust removal washing device 503. The PAC conditioning device 6 is connected to the sintering dedusting ash first-stage water washing device 501 through a fourth pipeline L4. The first-stage sintered dedusting ash washing device 501 is connected to the second-stage sintered dedusting ash washing device 502 through an eighth pipeline L8. The second sintered precipitator dust washing apparatus 502 is connected to the third sintered precipitator dust washing apparatus 503 through a ninth pipe L9. The third sintered dust-removing ash water washing device 503 is connected to the second sintered dust-removing ash water washing device 502 through a tenth pipe L10.

Example 6

Example 5 was repeated, and the system further included a sintered fly ash first stage filter press 504, a sintered fly ash second stage filter press 505, and a sintered fly ash third stage filter press 506. The first-stage sintered dedusting ash filter pressing device 504 is arranged on the eighth pipeline L8. The sintering dust removal secondary filter pressing device 505 is arranged on a ninth pipeline L9. The sintering dust-removing three-stage filter pressing device 506 is arranged on the tenth pipeline L10.

Example 7

Example 6 was repeated except that the system further included a blast furnace dry ash first-stage water washing tank 207, a blast furnace dry ash second-stage water washing tank 208, and a blast furnace dry ash third-stage water washing tank 209. A first bypass pipeline P1 is led out of the fifth pipeline L5 positioned at the downstream of the blast furnace dry ash primary filter pressing device 204 and is connected with the blast furnace dry ash primary water washing tank 207. A second bypass pipeline P2 is led out of the sixth pipeline L6 positioned at the downstream of the blast furnace dry ash secondary filter pressing device 205 and is connected with the blast furnace dry ash secondary water washing tank 208. The blast furnace dry ash three-stage washing tank 209 is arranged on a seventh pipeline L7 positioned at the downstream of the blast furnace dry ash three-stage filter pressing device 206.

Example 8

Example 7 was repeated except that the system further included a sintered fly ash first-stage water washing tank 507, a sintered fly ash second-stage water washing tank 508 and a sintered fly ash third-stage water washing tank 509. A third bypass pipeline P3 is led out from the eighth pipeline L8 positioned at the downstream of the first-stage sintering dust-removing pressure filter device 504 and is connected to a first-stage sintering dust-removing water washing tank 507. A fourth bypass pipeline P4 is led out from the ninth pipeline L9 positioned at the downstream of the second-stage sintering dust-removing filter pressing device 505 and is connected to the second-stage sintering dust-removing water washing tank 508. The sintered fly ash tertiary water wash tank 509 is disposed on a tenth conduit L10 located downstream of the sintered fly ash tertiary filter press apparatus 506.

Example 9

Example 8 is repeated except that the system further comprises a blast furnace dry ash sewage storage tank 210 and a sinter dust removal ash sewage storage tank 510. The blast furnace dry ash primary water washing tank 207 is connected to the blast furnace dry ash sewage storage tank 210 through an eleventh pipe L11. The first-stage sintered dust-removal water washing tank 507 is connected to the sewage storage tank 510 for sintered dust-removal ash through a twelfth pipe L12.

Example 10

Example 9 is repeated except that the water reuse conduit H comprises a first water reuse conduit H1 and a second water reuse conduit H2. The first water delivery and reuse pipeline H1 of the blast furnace dry ash and sewage storage tank 210 is connected to the PAC tempering device 6. The blast furnace dry ash secondary water washing tank 208 is connected to the second sinter fly ash secondary water washing apparatus 502 through a second delivery return pipe H2 and via a tenth pipe L10.

Example 11

Example 10 was repeated except that a thirteenth conduit L13 was also led out of the secondary sintered fly ash washing tank 508 and connected to the PAC conditioning apparatus 6 via a first water return conduit H1.

Example 12

Example 11 was repeated except that the system further included a blast furnace dry ash screw conveyor 7 and a sintered fly ash screw conveyor 8. The blast furnace dry ash screw conveyor 7 is arranged on the first pipeline L1. The sintering dust removal spiral conveying device 8 is arranged on the third pipeline L3.

Example 13

Example 12 is repeated except that the system further includes a blast furnace dry ash cake storage tank 211 and a sintered settled ash cake storage tank 511. The blast furnace dry ash three-stage pressure filtration device 206 is connected to a blast furnace dry ash cake storage tank 211 through a fourteenth pipe L14. The sintered fly ash three-stage filter pressing device 506 is connected to the sintered fly ash filter cake storage tank 511 through a fifteenth pipeline L15.

Example 14

Example 13 is repeated, except that the fourteenth line L14 is a bypass line of the seventh line L7. The fifteenth conduit L15 is a bypass conduit of the tenth conduit L10.

Example 15

Example 14 was repeated except that the blast furnace dry ash tertiary water washing apparatus 203 was further connected with a first industrial water transportation pipeline S1. And a second industrial water conveying pipeline S2 is also connected to the sintering dust removal three-stage water washing device 503.

Application example 1

Adopt to adopt traditional washing process, traditional step filter-pressing technology respectively and the utility model discloses embodiment 15 the system carries out the washing to steel high salt ash (blast furnace dry process ash and sintering dust removal ash) respectively, and wherein, the water ash mass ratio of washing at all levels is 1:1, and blast furnace dry process ash and the total ash content of sintering dust removal ash are 10 t/h.

The traditional water washing process specifically comprises the following steps: see figure 3 of the specification. Conveying the blast furnace dry ash into a blast furnace dry ash primary washing device through a screw conveying device, performing blast furnace dry ash primary washing by adopting 10t of water (from a blast furnace dry ash secondary washing tank), performing blast furnace dry ash primary filter pressing, and controlling the water content of a blast furnace dry ash primary filter cake to be 15% (based on the total mass of the added blast furnace dry ash), so as to obtain 8.5t of sewage (conveyed to a blast furnace dry ash sewage storage tank) and a blast furnace dry ash primary filter cake with 1.5t of water remained; conveying the first-stage blast furnace dry ash filter cake into a second-stage blast furnace dry ash washing device, washing with 10t of water (from a third-stage blast furnace dry ash washing tank), performing second-stage blast furnace dry ash filter pressing, and controlling the water content of the second-stage blast furnace dry ash filter cake to be 15% (based on the total mass of the added blast furnace dry ash), so as to obtain 10t of second-stage blast furnace dry ash washed water (conveyed into the second-stage blast furnace dry ash washing tank) and the second-stage blast furnace dry ash filter cake with 1.5t of water; conveying the second-stage filter cake of the blast furnace dry ash into a third-stage washing device of the blast furnace dry ash, carrying out third-stage washing of the blast furnace dry ash by using 10t of industrial water, then carrying out third-stage filter pressing of the blast furnace dry ash, controlling the water content of the third-stage filter cake of the blast furnace dry ash to be 15% (based on the total mass of the blast furnace dry ash added), and obtaining 10t of third-stage washed water of the blast furnace dry ash (conveyed to a third-stage washing tank of the blast furnace dry ash) and the third-stage filter cake of the blast furnace dry ash (transported to an external transportation disposal) with 1..

Conveying the sintering dedusting ash to a sintering dedusting ash primary washing device through a screw conveying device, performing sintering dedusting ash primary washing by adopting 17t of water (8.5t of blast furnace dry method ash sewage storage tank water and 8.5t of sintering dedusting ash secondary washing tank water), performing sintering dedusting ash primary filter pressing, controlling the water content of a sintering dedusting ash primary filter cake to be 15% (based on the total mass of the added sintering dedusting ash), and obtaining 15.5t of sewage (conveyed to a sintering dedusting ash sewage storage tank) and a sintering dedusting ash primary filter cake with 1.5t of water residual; conveying the sintered fly ash primary filter cake into a sintered fly ash secondary washing device, washing with 8.5t of water (from a sintered fly ash tertiary washing tank), performing sintered fly ash secondary filter pressing, and controlling the water content of the sintered fly ash secondary filter cake to be 15% (based on the total mass of the sintered fly ash added), so as to obtain 8.5t of sintered fly ash secondary washing water (conveyed to the sintered fly ash secondary washing tank) and a sintered fly ash secondary filter cake with 1.5t of water residual; the sintering dedusting ash secondary filter cake is conveyed to a sintering dedusting ash tertiary washing device, 8.5t of industrial water is adopted for sintering dedusting ash tertiary washing, then sintering dedusting ash tertiary filter pressing is carried out, the water content of the sintering dedusting ash tertiary filter cake is controlled to be 15% (based on the total mass of the sintering dedusting ash), 8.5t of sintering dedusting ash tertiary washing water (conveyed to a sintering dedusting ash tertiary washing tank) and 1.5t of residual sintering dedusting ash tertiary filter cake (external transportation treatment) are obtained.

The traditional cascade filter pressing process specifically comprises the following steps: see figure 4 of the specification. Conveying the blast furnace dry ash into a blast furnace dry ash primary washing device through a screw conveying device, performing blast furnace dry ash primary washing by adopting 10t of water (from a blast furnace dry ash secondary washing tank), performing blast furnace dry ash primary filter pressing, and controlling the water content of a blast furnace dry ash primary filter cake to be 50% (based on the total mass of the added blast furnace dry ash), so as to obtain 5t of sewage (conveyed to a blast furnace dry ash sewage storage tank) and a blast furnace dry ash primary filter cake with 5t of water; conveying the first-stage blast furnace dry ash filter cake into a second-stage blast furnace dry ash washing device, washing with 10t of water (from a third-stage blast furnace dry ash washing tank), performing second-stage blast furnace dry ash filter pressing, and controlling the water content of the second-stage blast furnace dry ash filter cake to be 50% (based on the total mass of the added blast furnace dry ash), so as to obtain 10t of second-stage blast furnace dry ash washed water (conveyed into the second-stage blast furnace dry ash washing tank) and 5t of residual water of the second-stage blast furnace dry ash filter cake; conveying the second-stage filter cake of the blast furnace dry ash into a third-stage washing device of the blast furnace dry ash, performing third-stage washing of the blast furnace dry ash by adopting 6.5t of industrial water, then performing third-stage filter pressing of the blast furnace dry ash, controlling the water content of the third-stage filter cake of the blast furnace dry ash to be 15% (based on the total mass of the blast furnace dry ash added), and obtaining 10t of third-stage washed water of the blast furnace dry ash (conveyed to a third-stage washing tank of the blast furnace dry ash) and the third-stage filter cake of the blast furnace dry ash (transported to be disposed outside) with 1.5t of.

Conveying the sintered dedusting ash to a primary sintered dedusting ash washing device through a screw conveying device, performing primary sintered dedusting ash washing by adopting 13.5t of water (5t of blast furnace dry method ash sewage storage tank water and 8.5t of secondary sintered dedusting ash washing tank water), performing primary sintered dedusting ash filter pressing, controlling the water content of a primary sintered dedusting ash filter cake to be 50% (based on the total mass of the added sintered dedusting ash), and obtaining 8.5t of sewage (conveyed to the primary sintered dedusting ash sewage storage tank) and a primary sintered dedusting ash filter cake with 5t of water; conveying the sintered fly ash first-stage filter cake into a sintered fly ash second-stage washing device, washing with 8.5t of water (from a sintered fly ash third-stage washing tank), performing sintered fly ash second-stage filter pressing, and controlling the water content of the sintered fly ash second-stage filter cake to be 50% (based on the total mass of the sintered fly ash added), so as to obtain 8.5t of water (conveyed to the sintered fly ash second-stage washing tank) after the sintered fly ash second-stage washing and the sintered fly ash second-stage filter cake with 5t of water residual; the sintering dedusting ash secondary filter cake is conveyed to a sintering dedusting ash tertiary washing device, 5t of industrial water is adopted for sintering dedusting ash tertiary washing, then sintering dedusting ash tertiary filter pressing is carried out, the water content of the sintering dedusting ash tertiary filter cake is controlled to be 15% (based on the total mass of the sintering dedusting ash), 8.5t of sintering dedusting ash tertiary washing water (conveyed to a sintering dedusting ash tertiary washing tank) and the sintering dedusting ash tertiary filter cake (transported to an external transportation disposal) with 1.5t of water are obtained.

The embodiment 15 of the utility model specifically is: see figure 5 of the specification. Conveying the blast furnace dry ash into a blast furnace dry ash primary washing device through a screw conveying device, performing blast furnace dry ash primary washing by adopting 10t of liquid caustic soda tempering saline water, performing blast furnace dry ash primary filter pressing, and controlling the water content of a blast furnace dry ash primary filter cake to be 50% (based on the total mass of the added blast furnace dry ash), so as to obtain 5t of sewage (conveyed to a blast furnace dry ash sewage storage tank) and a blast furnace dry ash primary filter cake with 5t of water remained; conveying the blast furnace dry ash first-stage filter cake into a blast furnace dry ash second-stage water washing device, washing with 8.5t of water (from a blast furnace dry ash third-stage water washing tank), then performing blast furnace dry ash second-stage filter pressing, and controlling the water content of the blast furnace dry ash second-stage filter cake to be 50% (based on the total mass of blast furnace dry ash added), so as to obtain 8.5t of blast furnace dry ash second-stage washed water (conveyed to the blast furnace dry ash second-stage water washing tank) and blast furnace dry ash second-stage filter cake with 5t of water remaining; conveying the second-stage filter cake of the blast furnace dry ash into a third-stage washing device of the blast furnace dry ash, carrying out third-stage washing of the blast furnace dry ash by using 5t of industrial water, then carrying out third-stage filter pressing of the blast furnace dry ash, controlling the water content of the third-stage filter cake of the blast furnace dry ash to be 15% (based on the total mass of the blast furnace dry ash added), and obtaining 8.5t of third-stage washed water of the blast furnace dry ash (conveyed to a third-stage washing tank of the blast furnace dry ash) and the third-stage filter cake of the blast furnace dry ash (transported to be disposed).

Conveying the sintered dedusting ash to a sintered dedusting ash primary washing device through a screw conveying device, performing sintered dedusting ash primary washing by adopting 17t of PAC (5t of blast furnace dry method ash sewage storage tank water and 12t of sintered dedusting ash secondary washing tank water), performing sintered dedusting ash primary filter pressing, controlling the water content of a sintered dedusting ash primary filter cake to be 50% (based on the total mass of the added sintered dedusting ash), and obtaining 12t of sewage (conveyed to the sintered dedusting ash sewage storage tank) and a sintered dedusting ash primary filter cake with residual water content of 5 t; conveying the sintered fly ash primary filter cake into a sintered fly ash secondary washing device, washing with 17t of water (8.5t of blast furnace dry process ash secondary washing tank water and 8.5t of sintered fly ash tertiary washing tank water), then performing sintered fly ash secondary filter pressing, controlling the water content of the sintered fly ash secondary filter cake to be 50% (based on the total mass of the added sintered fly ash), and obtaining 12t of sintered fly ash secondary washing water (conveyed to the sintered fly ash secondary washing tank) and a sintered fly ash secondary filter cake with 5t of water residual; the sintering dedusting ash secondary filter cake is conveyed to a sintering dedusting ash tertiary washing device, 5t of industrial water is adopted for sintering dedusting ash tertiary washing, then sintering dedusting ash tertiary filter pressing is carried out, the water content of the sintering dedusting ash tertiary filter cake is controlled to be 15% (based on the total mass of the sintering dedusting ash), 8.5t of sintering dedusting ash tertiary washing water (conveyed to a sintering dedusting ash tertiary washing tank) and the sintering dedusting ash tertiary filter cake (transported to an external transportation disposal) with 1.5t of water are obtained.

Through the process, the attached figure 3 in the specification shows that: the water amount of the wastewater generated by the traditional washing is 15.5m³H (sintering removal)Dust sewage storage tank). As can be seen from the attached FIG. 4 of the specification: the water amount of the wastewater generated by the traditional cascade filter pressing process is 8.5m³And h (sintering dust removal sewage storage tank). As can be seen from the attached FIG. 5 of the specification: the embodiment 15 of the utility model provides a waste water yield of 12m³Per hour (sintering dust removal ash storage tank), but 10m was consumed in the first-order washing of blast furnace dry ash due to example 15³Conditioning the salt-containing water, i.e. reducing the total plant wastewater by 10m³H, that is, the final wastewater volume produced by the embodiment 15 of the utility model is only 2m³/h(12m³Per-10 m of sintering dust-removing sewage storage tank³2m of dry ash quenched and tempered salt water of blast furnace³/h)。

Claims

1. The utility model provides a water washing processing system is synthesized to steel blast furnace dry process ash and sintering dust removal ash which characterized in that: the system comprises a blast furnace dry ash washing system (A) and a sintering dust removal ash washing system (B); the blast furnace dry ash washing system (A) comprises a blast furnace dry ash bin (1), a blast furnace dry ash multistage countercurrent washing device (2) and a liquid caustic soda conditioning device (3); the blast furnace dry ash bin (1) is connected with a blast furnace dry ash multistage countercurrent washing device (2) through a first pipeline (L1); the liquid caustic soda conditioning device (3) is connected with the blast furnace dry ash multistage countercurrent washing device (2) through a second pipeline (L2); the liquid caustic soda conditioning device (3) is also connected with a liquid caustic soda conveying pipeline (301) and a salt-containing wastewater conveying pipeline (302);

the sintering dedusting ash washing system (B) comprises a sintering dedusting ash bin (4), a sintering dedusting ash multistage countercurrent washing device (5) and a PAC conditioning device (6); the sintering dedusting ash bin (4) is connected with a sintering dedusting ash multistage countercurrent water washing device (5) through a third pipeline (L3); the PAC conditioning device (6) is connected with the sintering dedusting ash multistage countercurrent water washing device (5) through a fourth pipeline (L4); the PAC conditioning device (6) is also connected with a PAC conveying pipeline (601);

the blast furnace dry ash washing system (A) is connected with the sintering dedusting ash washing system (B) through a water delivery recycling pipeline (H).

2. The comprehensive water washing treatment system for the dry ash and the sintering dust removal ash of the steel blast furnace according to claim 1, which is characterized in that: the salt-containing wastewater conveying pipeline (302) is a wet desulphurization salt-containing wastewater conveying pipeline and/or an activated carbon flue gas purification washing salt-containing wastewater conveying pipeline.

3. The comprehensive water washing treatment system for the dry ash and the sintered settled ash of the steel blast furnace according to claim 1 or 2, which is characterized in that: the blast furnace dry ash multistage countercurrent washing device (2) comprises a blast furnace dry ash first-stage washing device (201), a blast furnace dry ash second-stage washing device (202) and a blast furnace dry ash third-stage washing device (203); the liquid caustic soda conditioning device (3) is connected with the blast furnace dry ash first-stage water washing device (201) through a second pipeline (L2); the blast furnace dry ash primary water washing device (201) is connected with the blast furnace dry ash secondary water washing device (202) through a fifth pipeline (L5); the blast furnace dry ash secondary washing device (202) is connected with the blast furnace dry ash tertiary washing device (203) through a sixth pipeline (L6); the blast furnace dry ash tertiary water washing device (203) is connected with the blast furnace dry ash secondary water washing device (202) through a seventh pipeline (L7);

the system also comprises a blast furnace dry ash primary filter pressing device (204), a blast furnace dry ash secondary filter pressing device (205) and a blast furnace dry ash tertiary filter pressing device (206); the blast furnace dry ash primary filter pressing device (204) is arranged on a fifth pipeline (L5); the blast furnace dry ash secondary filter pressing device (205) is arranged on a sixth pipeline (L6); the blast furnace dry ash three-stage filter pressing device (206) is arranged on a seventh pipeline (L7).

4. The comprehensive water washing treatment system for the dry ash and the sintered settled ash of the steel blast furnace according to claim 1 or 2, which is characterized in that: the sintering dedusting ash multistage countercurrent washing device (5) comprises a sintering dedusting ash first-stage washing device (501), a sintering dedusting ash second-stage washing device (502) and a sintering dedusting ash third-stage washing device (503); the PAC conditioning device (6) is connected to a sintering dedusting ash first-stage water washing device (501) through a fourth pipeline (L4); the sintering dedusting ash primary water washing device (501) is connected to the sintering dedusting ash secondary water washing device (502) through an eighth pipeline (L8); the second sintered dust-removing ash washing device (502) is connected to the third sintered dust-removing ash washing device (503) through a ninth pipeline (L9); the sintering dust-removal three-stage water washing device (503) is connected to the sintering dust-removal two-stage water washing device (502) through a tenth pipeline (L10);

the system also comprises a sintering dedusting ash primary filter pressing device (504), a sintering dedusting ash secondary filter pressing device (505) and a sintering dedusting ash tertiary filter pressing device (506); the sintering dust removal primary filter pressing device (504) is arranged on an eighth pipeline (L8); the sintering dust removal secondary filter pressing device (505) is arranged on a ninth pipeline (L9); the sintering dust removal three-stage filter pressing device (506) is arranged on a tenth pipeline (L10).

5. The comprehensive water washing treatment system for the dry ash and the sintering dust removal ash of the steel blast furnace according to claim 3, characterized in that: the sintering dedusting ash multistage countercurrent washing device (5) comprises a sintering dedusting ash first-stage washing device (501), a sintering dedusting ash second-stage washing device (502) and a sintering dedusting ash third-stage washing device (503); the PAC conditioning device (6) is connected to a sintering dedusting ash first-stage water washing device (501) through a fourth pipeline (L4); the sintering dedusting ash primary water washing device (501) is connected to the sintering dedusting ash secondary water washing device (502) through an eighth pipeline (L8); the second sintered dust-removing ash washing device (502) is connected to the third sintered dust-removing ash washing device (503) through a ninth pipeline (L9); the sintering dust-removal three-stage water washing device (503) is connected to the sintering dust-removal two-stage water washing device (502) through a tenth pipeline (L10);

6. The comprehensive water washing treatment system for the dry ash and the sintering dust removal ash of the steel blast furnace according to claim 5, characterized in that: the system also comprises a first-level washing tank (207) for the blast furnace dry ash, a second-level washing tank (208) for the blast furnace dry ash and a third-level washing tank (209) for the blast furnace dry ash; a first bypass pipeline (P1) is led out from a fifth pipeline (L5) positioned at the downstream of the blast furnace dry ash primary filter pressing device (204) and is connected with a blast furnace dry ash primary washing tank (207); a second bypass pipeline (P2) is led out from a sixth pipeline (L6) positioned at the downstream of the blast furnace dry ash secondary filter pressing device (205) and is connected with a blast furnace dry ash secondary washing tank (208); the blast furnace dry ash three-stage washing tank (209) is arranged on a seventh pipeline (L7) positioned at the downstream of the blast furnace dry ash three-stage filter pressing device (206).

7. The comprehensive water washing treatment system for the dry ash and the sintering dust removal ash of the steel blast furnace according to claim 4, characterized in that: the system also comprises a first-stage sintering and dedusting water washing tank (507), a second-stage sintering and dedusting water washing tank (508) and a third-stage sintering and dedusting water washing tank (509); a third bypass pipeline (P3) is led out from an eighth pipeline (L8) positioned at the downstream of the first-stage sintering dust-removal pressure filter device (504) and is connected to a first-stage sintering dust-removal water washing tank (507); a fourth bypass pipeline (P4) is led out from a ninth pipeline (L9) positioned at the downstream of the sintering dust-removing secondary filter pressing device (505) and is connected to a sintering dust-removing secondary water washing tank (508); the sintering dust-removal three-stage water washing tank (509) is arranged on a tenth pipeline (L10) positioned at the downstream of the sintering dust-removal three-stage pressure filter device (506).

8. The comprehensive water washing treatment system for the dry ash and the sintering dust removal ash of the steel blast furnace according to claim 5, characterized in that: the system also comprises a first-stage sintering and dedusting water washing tank (507), a second-stage sintering and dedusting water washing tank (508) and a third-stage sintering and dedusting water washing tank (509); a third bypass pipeline (P3) is led out from an eighth pipeline (L8) positioned at the downstream of the first-stage sintering dust-removal pressure filter device (504) and is connected to a first-stage sintering dust-removal water washing tank (507); a fourth bypass pipeline (P4) is led out from a ninth pipeline (L9) positioned at the downstream of the sintering dust-removing secondary filter pressing device (505) and is connected to a sintering dust-removing secondary water washing tank (508); the sintering dust-removal three-stage water washing tank (509) is arranged on a tenth pipeline (L10) positioned at the downstream of the sintering dust-removal three-stage pressure filter device (506).

9. The comprehensive water washing treatment system for the dry ash and the sintering dust removal ash of the steel blast furnace according to claim 6, characterized in that: the system also comprises a first-stage sintering and dedusting water washing tank (507), a second-stage sintering and dedusting water washing tank (508) and a third-stage sintering and dedusting water washing tank (509); a third bypass pipeline (P3) is led out from an eighth pipeline (L8) positioned at the downstream of the first-stage sintering dust-removal pressure filter device (504) and is connected to a first-stage sintering dust-removal water washing tank (507); a fourth bypass pipeline (P4) is led out from a ninth pipeline (L9) positioned at the downstream of the sintering dust-removing secondary filter pressing device (505) and is connected to a sintering dust-removing secondary water washing tank (508); the sintering dust-removal three-stage water washing tank (509) is arranged on a tenth pipeline (L10) positioned at the downstream of the sintering dust-removal three-stage pressure filter device (506).

10. The comprehensive water washing treatment system for the dry ash and the sintering dust removal ash of the steel blast furnace according to claim 9, which is characterized in that: the system also comprises a blast furnace dry method ash sewage storage tank (210) and a sintering dust removal ash sewage storage tank (510); the blast furnace dry ash first-stage water washing tank (207) is connected with the blast furnace dry ash sewage storage tank (210) through an eleventh pipeline (L11); the sintering dust-removal ash first-stage water washing tank (507) is connected to the sintering dust-removal ash sewage storage tank (510) through a twelfth pipeline (L12).

11. The integrated water washing treatment system for the dry ash and the sintering dust removal ash of the steel blast furnace according to claim 10, which is characterized in that: the water delivery recycling pipeline (H) comprises a first water delivery recycling pipeline (H1) and a second water delivery recycling pipeline (H2); the first water conveying and recycling pipeline (H1) of the blast furnace dry method ash sewage storage tank (210) is connected to the PAC tempering device (6); the blast furnace dry ash secondary water washing tank (208) is connected to a sintering dust removal secondary water washing device (502) through a second conveying and recycling pipeline (H2) and a tenth pipeline (L10);

a thirteenth pipeline (L13) is led out from the second-stage water washing tank (508) of the sintering and dedusting ash and is connected to the PAC conditioning device (6) through a first water conveying and recycling pipeline (H1).

12. The integrated water washing treatment system for the dry ash and the sintering dust removal ash of the steel blast furnace according to claim 11, which is characterized in that: the system also comprises a blast furnace dry ash spiral conveying device (7) and a sintering dust removal spiral conveying device (8); the blast furnace dry ash spiral conveying device (7) is arranged on a first pipeline (L1); the sintering dust removal spiral conveying device (8) is arranged on a third pipeline (L3);

the system also comprises a blast furnace dry ash filter cake storage tank (211) and a sintered dust removal ash filter cake storage tank (511); the blast furnace dry ash three-stage filter pressing device (206) is connected with a blast furnace dry ash filter cake storage tank (211) through a fourteenth pipeline (L14); the sintering dust-removal ash three-stage filter pressing device (506) is connected to a sintering dust-removal ash filter cake storage tank (511) through a fifteenth pipeline (L15).

13. The integrated water washing treatment system for the dry ash and the sintering dust removal ash of the steel blast furnace according to claim 12, which is characterized in that: the fourteenth pipe (L14) is a bypass pipe of the seventh pipe (L7); the fifteenth conduit (L15) is a bypass conduit of the tenth conduit (L10).

14. The integrated water washing treatment system for the dry ash and the sintered settled dust of the steel blast furnace according to any one of claims 6 and 8 to 13, which is characterized in that: the blast furnace dry ash three-stage water washing device (203) is also connected with a first industrial water conveying pipeline (S1); and a second industrial water conveying pipeline (S2) is also connected to the sintering dust removal ash three-stage washing device (503).