CN110921897A - Purification method of OMC desulfurization waste liquid - Google Patents
Purification method of OMC desulfurization waste liquid Download PDFInfo
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F9/00—Multistage treatment of water, waste water or sewage
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/281—Treatment of water, waste water, or sewage by sorption using inorganic sorbents
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- C02F2101/101—Sulfur compounds
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Abstract
The embodiment of the invention provides a purification method of OMC desulfurization waste liquid, which comprises the steps of inputting the OMC desulfurization waste liquid into a first-stage ceramic filter (1), and discharging the OMC desulfurization waste liquid after suspended particulate matters and oils are adsorbed by a porous filter material to form first purification liquid; inputting the first purified liquid into a second-stage adsorption catalytic filter (2), and discharging the first purified liquid which adsorbs suspended particles and oils through a first active material to form second purified liquid; inputting the second purified liquid into a third-stage ceramic filter (3), and discharging the second purified liquid after adsorbing the desulfurization catalyst by a second active material to form third purified liquid; and inputting the third purified liquid into a fourth-stage ceramic filter (4), and discharging the third purified liquid which adsorbs suspended particles, desulfurization catalyst and oils through a second ceramic membrane to form fourth purified liquid. Suspended matters, desulfurization catalysts and oils in the OMC desulfurization waste liquid can be physically adsorbed through the filtration of the four-stage filter.
Description
Technical Field
The invention relates to the field of desulfurization waste liquid purification, in particular to a purification method of an OMC desulfurization waste liquid.
Background
In the process of OMC desulfurization (wet desulfurization), the salt content of the desulfurization solution is gradually increased, and the accumulation of components such as thiocyanate, thiosulfate, sulfate and the like can influence the desulfurization effect of the desulfurization solution, so that part of the desulfurization solution can be periodically discharged to become OMC desulfurization waste liquid, and the part of the OMC desulfurization waste liquid is sent to sintering for ore blending.
In the process of implementing the invention, the applicant finds that at least the following problems exist in the prior art:
the discharged OMC desulfurization waste liquid contains a large amount of suspended sulfur, desulfurization catalysts and other substances, which can cause the emission of sulfur dioxide and the like from sintering tail gas to exceed standards, and increase the sulfur content of sinter to influence the quality of the sinter.
Disclosure of Invention
The embodiment of the invention provides a purification method of an OMC desulfurization waste liquid, which can physically adsorb suspended matters, desulfurization catalysts and oils in the OMC desulfurization waste liquid through the filtration of a four-stage filter, and reduce the contents of the suspended matters, the desulfurization catalysts and the oils.
In order to achieve the above object, an embodiment of the present invention provides a method for purifying an OMC desulfurization waste liquid, including:
step A: inputting the OMC desulfurization waste liquid into a first-stage ceramic filter, enabling the OMC desulfurization waste liquid to flow through a porous filter material, adsorbing suspended particulate matters and oil in the OMC desulfurization waste liquid through the porous filter material, and discharging the OMC desulfurization waste liquid after adsorbing the suspended particulate matters and the oil through the porous filter material to form first purified liquid; the porous filter material comprises: a first ceramic membrane and a porous ceramic filter device; the porous ceramic filtering device and the first ceramic membrane are communicated up and down, the porous ceramic filtering device is arranged on the first ceramic membrane,
and B: inputting the first purified liquid into a second-stage adsorption catalytic filter, enabling the first purified liquid to flow through a first active material, enabling the first active material to adsorb suspended particulate matters and oils in the first purified liquid, and discharging the first purified liquid with the suspended particulate matters and the oils adsorbed by the first active material to form second purified liquid;
and C: inputting the second purified liquid into a third-stage ceramic filter, enabling the second purified liquid to flow through a second active material, enabling the second active material to adsorb the desulfurization catalyst in the second purified liquid, and discharging the second purified liquid after the desulfurization catalyst is adsorbed by the second active material to form third purified liquid;
step D: and inputting the third purifying liquid into a fourth-stage ceramic filter, enabling the third purifying liquid to flow through a second ceramic membrane, adsorbing suspended particles, desulfurization catalysts and oils in the third purifying liquid by the second ceramic membrane, and discharging the third purifying liquid adsorbing the suspended particles, the desulfurization catalysts and the oils by the second ceramic membrane to form fourth purifying liquid.
The technical scheme has the following beneficial effects: step A: and (3) conveying the OMC desulfurization waste liquid from a desulfurization waste liquid tank to the first-stage ceramic filter direction through a main liquid inlet valve group and a liquid inlet valve group by using a waste liquid pump M. Wherein, first order ceramic filter has first entry and first export, and first entry is connected in the waste liquid pump, and OMC desulfurization waste liquid that the waste liquid pump was carried enters into first order ceramic filter through first entry in, makes OMC desulfurization waste liquid flow through porous filter material, and first order ceramic filter is composite filter, and composite filter includes two kinds of porous filter materials, and two kinds of porous filter materials are: the ceramic membrane filter comprises a first ceramic membrane and a porous ceramic filter device, wherein the porous ceramic filter device and the first ceramic membrane are arranged in a vertically communicated mode, and the porous ceramic filter device is arranged on the first ceramic membrane. By utilizing the characteristics of porous adsorption and large-particle adsorption of the porous ceramic filtering device and the first ceramic membrane, the porous ceramic filtering device and the first ceramic membrane can adsorb a large amount of suspended substances (suspended sulfur and other granular impurities) of large particles, and because the diameter of the suspended sulfur is larger than that of the catalyst, the porous ceramic filtering device and the first ceramic membrane mainly adsorb the suspended sulfur and other impurities with larger diameters, and also can adsorb a small amount of desulfurization catalyst (the desulfurization catalyst is blue), and meanwhile, the oil can also be adsorbed. Suspended particulate matters and oils in the OMC desulfurization waste liquid are adsorbed by the porous ceramic filtering device and the first ceramic membrane, and the OMC desulfurization waste liquid after the suspended particulate matters and the oils are adsorbed by the porous ceramic filtering device and the first ceramic membrane is discharged through the first outlet to form first purified liquid. The content of the suspension in the first purified liquid is greatly reduced.
And B: conveying the first purified liquid to a second-stage adsorption catalytic filter through a liquid inlet valve group, wherein the second-stage adsorption catalytic filter is provided with a second inlet and a second outlet; the second inlet pipeline is connected to the first outlet; the second stage adsorption catalytic filter includes a first active material within the second stage adsorption catalytic filter and positioned between the second inlet and the second outlet.
The first purifying liquid enters the second-stage adsorption catalytic filter 2 through a second inlet of the second-stage adsorption catalytic filter, so that the first purifying liquid flows through the first active material, the first active material is used for further adsorbing suspended particulate matters (mainly suspended sulfur and other impurities) in the waste liquid and a small amount of desulfurization catalyst and oil, and the first active material can be activated carbon. The first purifying liquid flowing out of the first active material is discharged through a second outlet of the second-stage adsorption catalytic filter to form a second purifying liquid. In the second purified liquid, the content of suspended matters is greatly reduced.
And C: the second purifying liquid is conveyed to a third-stage ceramic filter through a liquid inlet valve group, the third-stage ceramic filter is provided with a third inlet and a third outlet, and a second outlet pipeline is connected to the third inlet. The third stage ceramic filter includes a second active material in an interior of the third stage ceramic filter, the second active material being located between the third inlet and the third outlet.
In the second purifying liquid enters into third level ceramic filter through third level ceramic filter's third entry, in the second purifying liquid that forms after filtering the absorption through porous filter material, the content of suspended solid reduces greatly, and second active material can be active carbon, and active carbon has the porosity, can adsorb the granule. The content of suspended sulfur in the second purified liquid is greatly reduced, so that the second active material mainly adsorbs a large amount of desulfurization catalyst, a small amount of suspended flow and other impurities in the second purified liquid, and also adsorbs oil, and the second purified liquid is discharged through a third outlet of the third-stage ceramic filter after flowing through the second active material to form third purified liquid. The content of suspended sulfur, a desulfurization catalyst and oil in the third purified liquid is greatly reduced, the conveying pipeline of the OMC desulfurization waste liquid cannot be blocked, when the third purified liquid is conveyed to sintering for ore matching, gases such as sulfur dioxide and hydrogen sulfide generated by sintering can be reduced, and the environment pollution caused by the excessive discharge of the sulfur dioxide and the hydrogen sulfide is basically avoided. In addition, because the content of the suspended sulfur and the content of the desulfurization catalyst are greatly reduced, the sintered ore contains less sulfur and less sulfur-containing catalyst, and the quality of the sintered ore is improved.
Step D: conveying the third purified liquid to a fourth-stage ceramic filter through a liquid inlet valve group, wherein the fourth-stage ceramic filter is provided with a fourth inlet and a fourth outlet; the fourth inlet is connected to the third outlet; feeding a third cleaning solution into the fourth ceramic filter through a fourth inlet of the fourth ceramic filter,
the fourth stage ceramic filter comprises a second ceramic membrane disposed within the fourth stage ceramic filter 4, and the second ceramic membrane is positioned between the fourth inlet and the fourth outlet. The third purifying liquid flows through the second ceramic membrane, the second ceramic membrane can further adsorb suspended particles, desulfurization catalysts and oils in the third purifying liquid, and the third purifying liquid adsorbing the suspended particles, the desulfurization catalysts and the oils through the second ceramic membrane is discharged through the fourth outlet to form fourth purifying liquid. And suspended particles, a desulfurization catalyst and oils in the third purified liquid are adsorbed through pores of the second ceramic membrane, so that the adsorption quantity of the suspended particles, the catalyst and the oils in the waste liquid is further improved, and the contents of suspended sulfur, the desulfurization catalyst, other particle impurities and the oils in the OMC desulfurization waste liquid are reduced.
The fourth purified liquid contains very little suspended sulfur, desulfurization catalyst and oil, and does not block a conveying pipeline of the OMC desulfurization waste liquid; and when the powder is sintered for ore blending, gases such as sulfur dioxide, hydrogen sulfide and the like generated by sintering can be greatly reduced, the emission of the sulfur dioxide and the hydrogen sulfide meets the emission standard, and the environment is not polluted. In addition, the sintered ore contains less sulfur and less sulfur-containing catalyst, and the sintered ore has very good quality.
To sum up, through the four times of adsorption filtration on the OMC desulfurization waste liquid, a large amount of suspended matters (mainly suspended sulfur and other impurities) and a large amount of desulfurization catalysts are filtered. The pipeline blockage in the desulfurization waste liquid conveying process is avoided.
When the fourth purifying liquid is sent to the sintering for ore blending, because the content of suspended sulfur in the fourth purifying liquid is greatly reduced, gases such as sulfur dioxide, hydrogen sulfide and the like generated by sintering can be greatly reduced, and the quality of the sintered ore meeting the emission standard is good.
In addition, in the method, physical operations are adopted for removing the suspended matters and the desulfurization catalyst, so that chemical agents are avoided, no new waste is generated, the environmental protection performance is high, the method is convenient for enterprises adopting OMC desulfurization to copy and use, and the economic value is high.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a flow chart of a method for purifying an OMC desulfurization waste liquid according to an embodiment of the present invention;
FIG. 2 is a flow chart of another method for purifying an OMC desulfurization waste liquid in accordance with an embodiment of the present invention.
The reference numerals are represented as:
1. a first stage ceramic filter; 2. a second stage adsorption catalytic filter; 3. a third stage ceramic filter; 4. a fourth stage ceramic filter;
11. a first inlet; 12. a first outlet; 31. a third inlet; 32. a third outlet; 21. a second inlet; 22. a second outlet; 41. a fourth inlet; 42. a fourth outlet.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, in combination with an embodiment of the present invention, which adopts a single system, there is provided a method for purifying OMC desulfurization waste liquid, comprising:
step A: and (3) conveying the OMC desulfurization waste liquid from a desulfurization waste liquid tank to the direction of the first-stage ceramic filter 1 through a total liquid inlet valve group M1 and a liquid inlet valve group 2w by using a waste liquid pump M. Wherein, first order ceramic filter 1 has first entry 11 and first export 12, and first entry 11 is connected in waste liquid pump M, and OMC desulfurization waste liquid that waste liquid pump M carried enters into first order ceramic filter 1 through first entry 11 in, makes OMC desulfurization waste liquid flow through porous filter material, and first order ceramic filter 1 is composite filter, and composite filter includes two kinds of porous filter materials, and two kinds of porous filter materials are: the ceramic membrane filter comprises a first ceramic membrane and a porous ceramic filter device, wherein the porous ceramic filter device and the first ceramic membrane are arranged in a vertically communicated mode, and the porous ceramic filter device is arranged on the first ceramic membrane. By utilizing the characteristics of porous adsorption and large-particle adsorption of the porous ceramic filtering device and the first ceramic membrane, the porous ceramic filtering device and the first ceramic membrane can adsorb a large amount of suspended substances (suspended sulfur and other granular impurities) of large particles, and because the diameter of the suspended sulfur is larger than that of the catalyst, the porous ceramic filtering device and the first ceramic membrane mainly adsorb the suspended sulfur and other impurities with larger diameters, and also can adsorb a small amount of desulfurization catalyst (the desulfurization catalyst is blue), and meanwhile, the oil can also be adsorbed. Suspended particulate matters and oils in the OMC desulfurization waste liquid are adsorbed by the porous ceramic filtering device and the first ceramic membrane, and the OMC desulfurization waste liquid after the suspended particulate matters and the oils are adsorbed by the porous ceramic filtering device and the first ceramic membrane is discharged through the first outlet 12 to form first purified liquid. The content of the suspension in the first purified liquid is greatly reduced.
And B: delivering the first purified liquid to a second-stage adsorption catalytic filter 2 through a liquid inlet valve group 6x, wherein the second-stage adsorption catalytic filter 2 is provided with a second inlet 21 and a second outlet 22; the second inlet 21 is connected to the first outlet 12 in a pipeline manner; the second stage adsorption catalytic filter 2 comprises a first active material inside the second stage adsorption catalytic filter 2 and located between the second inlet 21 and the second outlet 22.
The first purifying liquid enters the second-stage adsorption catalytic filter 2 through the second inlet 21 of the second-stage adsorption catalytic filter 2, so that the first purifying liquid flows through the first active material, the first active material is used for further adsorbing suspended particulate matters (mainly suspended sulfur and other impurities) in the waste liquid and a small amount of desulfurization catalyst and oil, and the first active material can be activated carbon. The first purified liquid flowing out of the first active material is discharged through the second outlet 22 of the second-stage adsorption catalytic filter 2 to form a second purified liquid. In the second purified liquid, the content of suspended matters is greatly reduced.
And C: and the second purification liquid is conveyed to the third-stage ceramic filter 3 through the liquid inlet valve group 7y, the third-stage ceramic filter 3 is provided with a third inlet 31 and a third outlet 32, and the second outlet 22 is connected to the third inlet 31 through a pipeline. The third stage ceramic filter 3 comprises a second active material, which is inside the third stage ceramic filter 3, which is located between the third inlet 31 and the third outlet 32.
The third entry 31 that the second scavenging solution passes through third level ceramic filter 3 enters into third level ceramic filter 3 in, in the second scavenging solution that forms after filtering the absorption through porous filter material, the content of suspended solid reduces greatly, and the second active material can be active carbon, and active carbon has the porosity, can the adsorbed particle. The content of suspended sulfur in the second purified liquid is greatly reduced, so that the second active material mainly adsorbs a large amount of desulfurization catalyst, a small amount of suspended flow and other impurities in the second purified liquid, and also adsorbs oils, and the second purified liquid is discharged through the third outlet 32 of the third-stage ceramic filter 3 after passing through the second active material, forming a third purified liquid. The content of suspended sulfur, a desulfurization catalyst and oil in the third purified liquid is greatly reduced, the conveying pipeline of the OMC desulfurization waste liquid cannot be blocked, when the third purified liquid is conveyed to sintering for ore matching, gases such as sulfur dioxide and hydrogen sulfide generated by sintering can be reduced, and the environment pollution caused by the excessive discharge of the sulfur dioxide and the hydrogen sulfide is basically avoided. In addition, because the content of the suspended sulfur and the content of the desulfurization catalyst are greatly reduced, the sintered ore contains less sulfur and less sulfur-containing catalyst, and the quality of the sintered ore is improved.
Step D: delivering the third purified liquid to a fourth ceramic filter 4 through a liquid inlet valve group 11z, wherein the fourth ceramic filter 4 is provided with a fourth inlet 41 and a fourth outlet 42; the fourth inlet 41 is connected to the third outlet 32; feeding a third purified liquid into the fourth ceramic filter 4 through a fourth inlet 41 of the fourth ceramic filter 4, said fourth ceramic filter 4 comprising a second ceramic membrane, said second ceramic membrane being located inside said fourth ceramic filter 4 and said second ceramic membrane being located between said fourth inlet 41 and said fourth outlet 42. The third purifying liquid flows through the second ceramic membrane, the second ceramic membrane can further adsorb suspended particles, desulfurization catalysts and oils in the third purifying liquid, and the third purifying liquid adsorbing the suspended particles, desulfurization catalysts and oils through the second ceramic membrane is discharged through the fourth outlet 42 to form fourth purifying liquid. And suspended particles, a desulfurization catalyst and oils in the third purified liquid are adsorbed through pores of the second ceramic membrane, so that the adsorption quantity of the suspended particles, the catalyst and the oils in the waste liquid is further improved, and the contents of suspended sulfur, the desulfurization catalyst, other particle impurities and the oils in the OMC desulfurization waste liquid are reduced.
The fourth purified liquid contains very little suspended sulfur, desulfurization catalyst and oil, and does not block a conveying pipeline of the OMC desulfurization waste liquid; and when the powder is sintered for ore blending, gases such as sulfur dioxide, hydrogen sulfide and the like generated by sintering can be greatly reduced, the emission of the sulfur dioxide and the hydrogen sulfide meets the emission standard, and the environment is not polluted. In addition, the sintered ore contains less sulfur and less sulfur-containing catalyst, and the sintered ore has very good quality.
To sum up, through the four times of adsorption filtration on the OMC desulfurization waste liquid, a large amount of suspended matters (mainly suspended sulfur and other impurities) and a large amount of desulfurization catalysts are filtered. The pipeline blockage in the desulfurization waste liquid conveying process is avoided.
When the fourth purifying liquid is sent to sintering for ore blending, because the content of suspended sulfur in the fourth purifying liquid is greatly reduced, gases such as sulfur dioxide, hydrogen sulfide and the like generated by sintering can be greatly reduced, and the sulfur dioxide and the hydrogen sulfide accord with emission standards
In addition, in the method, physical operations are adopted for removing the suspended matters and the desulfurization catalyst, so that chemical agents are avoided, no new waste is generated, the environmental protection performance is high, the method is convenient for enterprises adopting OMC desulfurization to copy and use, and the economic value is high.
Preferably, in step a: the porous ceramic filtering device and the first ceramic membrane are communicated up and down, the porous ceramic filtering device is arranged on the first ceramic membrane, and OMC desulfurization waste liquid flows through the porous ceramic filtering device and the first ceramic membrane from top to bottom in sequence. In first order ceramic filter 1, porous ceramic filter equipment with first ceramic membrane communicates the setting from top to bottom, porous ceramic filter equipment locates on the first ceramic membrane, just porous ceramic filter equipment with first ceramic membrane is located first entry 11 with between the first export 12, first entry 11 is located the top of first order ceramic filter 1, first export 12 is located the bottom of first order ceramic filter 1.
The OMC desulfurization waste liquid flows through the porous ceramic filtering device and the first ceramic membrane from top to bottom in sequence, namely the OMC desulfurization waste liquid firstly passes through the porous ceramic filtering device and then flows through the first ceramic membrane. The OMC desulfurization waste liquid vertically flows through each filter material from top to bottom, so that the OMC desulfurization waste liquid can be fully contacted with each filter material, the adsorption capacity of the filter material is fully utilized, the adsorption quantity of the filter material on suspended sulfur, impurities, desulfurization catalysts, oil and other particulate matters is increased, and the purification efficiency of the OMC desulfurization waste liquid is improved. By the adsorption of the porous ceramic filter device and the first ceramic membrane, a large amount of suspended matter and a small amount of catalyst are intercepted, and simultaneously, the oil exists, so that the content of suspended matter in the first purified liquid is greatly reduced. The content of suspended matters can be reduced to be below 800mg/L (namely less than or equal to 800mg/L), and the chroma is reduced to be below 3500 degrees (namely less than or equal to 3500 degrees).
In step B: in second level adsorption catalysis filter 2, second entry 21 is located the top of second level adsorption catalysis filter 2, second export 22 is located the bottom of second level adsorption catalysis filter 2 is inputed first purifying liquid to first active material's top, and first purifying liquid top-down flows through first active material perpendicularly for first purifying liquid can fully contact with first active material, make full use of first active material's adsorption efficiency, improve the adsorption quantity of first active material to particulate matter such as suspension sulphur, desulfurization catalyst, impurity and oils, mention the purifying effect to OMC desulfurization waste liquid greatly. After the first active material adsorbs suspended particulate matter and oils in the first purified liquid (the particles are from large to small), the first purified liquid is discharged through the second outlet 22 of the second-stage adsorption catalytic filter 2 to form a second purified liquid. In the second purified liquid, the content of suspended matters can be reduced to below 300mg/L (namely, less than or equal to 300mg/L), and the chroma is reduced to below 1000 degrees (namely, less than or equal to 1000 degrees). That is to say in the second purifying liquid at this moment, the content greatly reduced of suspended solid for second active material in it adsorbs a smaller amount of suspended sulfur (suspended sulfur particle is big) after the second purifying liquid enters into third level ceramic filter 3, improves the desulfurization catalyst that the second active material adsorbs more, improves the smoothness nature of second purifying liquid circulation.
In step C: in the third stage ceramic filter 3, the third inlet 31 is located at the top of the third stage ceramic filter 3, the third outlet 32 is located at the bottom of the third stage ceramic filter 3, the second purification liquid enters the third stage ceramic filter 3 through the third inlet 31 of the third stage ceramic filter 3, and is input above the second active material in the third stage ceramic filter 3, and the second purification liquid flows through the second active material from top to bottom. The second purifying liquid vertically flows through the second active material from top to bottom, so that the second purifying liquid can be fully contacted with the second active material, the adsorption capacity of the second active material is fully utilized, the adsorption quantity of the second active material to the desulfurization catalyst, the suspended sulfur, impurities, oil and other particulate matters is increased, and the purification effect on the OMC desulfurization waste liquid is greatly improved. After flowing through the second active material from top to bottom, the second purified liquid is discharged through the third outlet 32 of the third stage ceramic filter 3, forming a third purified liquid. In the third purified liquid, the chroma is reduced to below 250 ℃ (namely, less than or equal to 250 ℃), and the content of suspended matters is reduced to below 120mg/L (namely, less than or equal to 120 mg/L).
In step D: in the fourth stage ceramic filter 4, the fourth inlet 41 is located at the bottom of the fourth stage ceramic filter 4, the fourth outlet is located at the top of the fourth stage ceramic filter 4, the third purification liquid is input to the lower part of the second ceramic membrane in the fourth stage ceramic filter 4 through the fourth inlet 41, and the third purification liquid flows through the second ceramic membrane from bottom to top. And when the third purifying liquid flows upwards, the third purifying liquid flows downwards for a certain distance due to the gravity of the waste liquid, the backflow liquid contacts with the pores of the second ceramic membrane again, part of suspended particles, catalysts and oils in the third purifying liquid are adsorbed, and the backflow waste liquid can continue to flow upwards, can contact with the pores of the second ceramic membrane and can adsorb part of the suspended particles, catalysts and oils. The third purifying liquid is contacted with the pores of the second ceramic membrane more closely and fully, so that the second ceramic membrane can further adsorb suspended sulfur, catalyst, oil and other impurities, the OMC desulfurization waste liquid is deeply purified, the adsorption quantity of suspended particles, catalyst and oil in the waste liquid is increased, and the adsorption capacity of the second ceramic membrane is improved. In the fourth purified liquid, the content of suspended matters can be reduced to be less than 20mg/L (namely less than or equal to 20mg/L), and the chroma is reduced to be less than 100 degrees (namely less than or equal to 100 degrees).
Through having optimized the OMC desulfurization waste liquid flow direction in to each level filter, make filter media or filter material of each level and the contact of OMC desulfurization waste liquid more abundant, mention greatly to the suspension sulphur, desulfurization catalyst, the absorption of other particle impurity and oils, the suspension sulphur has been reduced, desulfurization catalyst, the content of other particle impurity and oils, when making final exhaust fourth purifying liquid send the sintering to be used for joining in marriage the ore deposit, the produced sulfur dioxide of sintering, gas such as hydrogen sulfide also can significantly reduce, can not lead to sulfur dioxide, the hydrogen sulfide discharges the polluted environment that exceeds standard. In addition, the content of suspended sulfur and a desulfurization catalyst (sulfur-containing catalyst) is greatly reduced, the sulfur content in the sintered ore is less, the sulfur-containing catalyst is less, and the quality of the sintered ore can be improved.
Preferably, as the first-stage ceramic filter 1 mainly adsorbing suspended matters, the porous ceramic filter device comprises porous ceramics, the porous ceramics are arranged on the first ceramic membrane, and the porosity of the porous ceramics communicated with the first ceramic membrane is 39%. And the large porosity is adopted, so that a large amount of suspended sulfur can be quickly adsorbed.
Preferably, the first ceramic membrane has a porosity of 35% and a pore size in the range of: 0.5-2 μm, and can further rapidly adsorb a large amount of suspended sulfur.
Preferably, corundum ceramics for supporting the first active material is arranged below the first active material, the first active material is supported and fixed through the corundum ceramics, the corundum ceramics is provided with a channel for liquid circulation after purification of the first active material, and the corundum ceramics, also called ceramic corundum or ceramic corundum, belongs to one type of ceramics, has the characteristics of corrosion resistance, high wear resistance and long service life, can not be corroded by the OMC desulfurization waste liquid in the process of contacting with the OMC desulfurization waste liquid, has long service life and reduces the maintenance and replacement cost. The waste liquid filtered by the porous filter material flows through the first active material from top to bottom, and the formed second purifying liquid is discharged out of the second-stage adsorption catalytic filter 2 after passing through a channel of corundum ceramics.
Preferably, the channel on the corundum ceramic is provided with a plurality of filter tubes, gaps between two adjacent filter tubes are different, and the irregular gaps of the filter tubes are utilized, so that the waste liquid flowing out from the lower part of the first active material flows irregularly (or called baffling), and the first active material is further increased to adsorb more suspended sulfur, other impurities, oils and desulfurization catalysts.
Preferably, the nominal diameter of all the pipelines for conveying the OMC desulfurization waste liquid is 65mm, so that the 65mm pipelines can convey the OMC desulfurization waste liquid from the waste liquid pump M to the first-stage ceramic filter 1 in a large flow, and the large flow conveying between every two adjacent filters is realized, thereby ensuring the purification speed and efficiency of the waste liquid. The 304 stainless steel pipeline is high temperature resistant, and meanwhile, the pipeline can be prevented from being corroded by thiocyanate, thiosulfate and sulfate in the desulfurization waste liquid.
Preferably, the treatment capacity of the first-stage ceramic filter 1 and the second-stage adsorption catalytic filter 2 to the OMC desulfurization waste liquid is 15m 3/h. In each system, the nominal diameter of the pipeline adopted between the two connected filters is 65mm, and the material is 304 stainless steel, so that the treatment capacity of each system on the OMC desulfurization waste liquid can reach 15m3H is used as the reference value. Each system can treat OMC desulfurization waste liquid for more than 72 hours.
In the method, a plurality of first-stage ceramic filters 1 can be arranged in parallel, and a second-stage adsorption catalytic filter 2, a third-stage ceramic filter 3 and a fourth-stage ceramic filter 4 are correspondingly arranged behind each first-stage ceramic filter 1, so that a plurality of sets of filtering systems are formed, the plurality of sets of systems operate simultaneously, and the waste liquid treatment capacity is improved. As shown in FIG. 2, the method adopts two sets of filter systems connected in parallel, wherein one set is arranged in an upper broken line frame and one set is arranged in a lower broken line frame. Two sets of purification devices of OMC desulfurization waste liquid connected in parallel operate simultaneously, each set of purification treatment system of OMC desulfurization waste liquid is filtered by 4 levels successively, and the treatment process of the embodiment is as follows:
firstly, OMC desulfurization waste liquid is conveyed through a pump 10, the pump 10 conveys the OMC desulfurization waste liquid from a desulfurization waste liquid tank to the direction of a first-stage ceramic filter 1 through a total liquid inlet valve group M1 and a liquid inlet valve group 2w, the OMC desulfurization waste liquid enters the first-stage ceramic filter 1 through a first inlet 11, the OMC desulfurization waste liquid can be input to the upper part of a porous filter material in the first-stage ceramic filter 1, the OMC desulfurization waste liquid can flow through the porous filter material from top to bottom, the porous filter material comprises a first ceramic membrane and a porous ceramic filtering device, the porous ceramic filtering device and the first ceramic membrane are communicated with each other from top to bottom, and the porous ceramic filtering device is arranged on the first ceramic membrane, so the OMC desulfurization waste liquid firstly passes through the porous ceramic filtering device and then flows through the. By utilizing the characteristics of porous adsorption and large-particle adsorption of the porous ceramic filtering device and the first ceramic membrane, the porous ceramic filtering device and the first ceramic membrane can adsorb a large amount of suspended matters of large particles, and because the diameter of suspended sulfur is larger than that of the catalyst, the porous ceramic filtering device and the first ceramic membrane mainly adsorb suspended sulfur and other impurities with larger diameters, and also can adsorb a small amount of desulfurization catalyst (the desulfurization catalyst is blue), and meanwhile, the oil can be adsorbed. The OMC desulfurization waste liquid vertically flows through each filter material from top to bottom, so that the OMC desulfurization waste liquid can be fully contacted with each filter material, the adsorption capacity of the filter material is fully utilized, the adsorption quantity of the filter material on suspended sulfur, impurities, desulfurization catalysts, oil and other particulate matters is increased, and the purification efficiency of the OMC desulfurization waste liquid is improved. After the porous filter material adsorbs suspended particulate matters and oils in the waste liquid, the OMC desulfurization waste liquid is discharged through a first outlet 12 of the first-stage ceramic filter 1 to form a first purified liquid. By the adsorption of the porous ceramic filter device and the first ceramic membrane, a large amount of suspended matter and a small amount of catalyst are intercepted, and simultaneously, the oil exists, so that the content of suspended matter in the first purified liquid is greatly reduced. The content of suspended matters can be reduced to be below 800mg/L (namely less than or equal to 800mg/L), and the chroma is reduced to be below 3500 degrees (namely less than or equal to 3500 degrees).
Secondly, conveying the first purified liquid to a second-stage adsorption catalytic filter 2 through a liquid inlet valve group 6x, wherein the second-stage adsorption catalytic filter 2 is provided with a second inlet 21 and a second outlet 22, the second inlet 21 is positioned at the top of the second-stage adsorption catalytic filter 2, and the second outlet 22 is positioned at the bottom of the second-stage adsorption catalytic filter 2; the second inlet 21 is connected to the first outlet 12 in a pipeline manner; the second stage adsorption catalytic filter 2 comprises a first active material, which may be activated carbon. The first active material is inside the second stage adsorption catalytic filter 2 and is located between the second inlet 21 and the second outlet 22. The first purified liquid enters the second-stage adsorption catalytic filter 2 through the second inlet 21 above the first active material. The second inlet 21 is arranged at the top, the second outlet 22 is arranged at the bottom, so that the first purifying liquid can flow through the first active material from top to bottom, the waste liquid can be in full contact with the first active material due to the vertical flow of the first active material from top to bottom, the adsorption capacity of the first active material is fully utilized, the adsorption quantity of the first active material on suspended sulfur, desulfurization catalysts, impurities, oils and other particulate matters is increased, and the purification effect on the OMC desulfurization waste liquid is greatly improved. After the first active material adsorbs the suspended particulate matter and the oil in the first purified liquid (the particles are from large to small), the first purified liquid adsorbed with the suspended particulate matter and the oil is discharged through the second outlet 22 to form a second purified liquid. In the second purified liquid, the content of suspended matters can be reduced to below 300mg/L (namely, less than or equal to 300mg/L), and the chroma is reduced to below 1000 degrees (namely, less than or equal to 1000 degrees).
In the second purifying liquid at this moment, the content of suspended solid greatly reduced, after the second purifying liquid enters into third level ceramic filter 3 for the second active material in it adsorbs a smaller amount of suspended sulfur (suspended sulfur particle is big), improves the more desulfurization catalyst of second active material adsorption, improves the smoothness nature of second purifying liquid circulation.
The third and second purified liquids are delivered to a third-stage ceramic filter 3 through a liquid inlet valve group 7y, the third-stage ceramic filter 3 is provided with a third inlet 31 and a third outlet 32, the third inlet 31 is located at the top of the third-stage ceramic filter 3, the third outlet 32 is located at the bottom of the third-stage ceramic filter 3, and the second outlet 22 is connected to the third inlet 31 through a pipeline; the third stage ceramic filter 3 comprises a second active material, which is inside the third stage ceramic filter 3, which is located between the third inlet 31 and the third outlet 32. The second purifying liquid enters the upper part of the second active material in the third-stage ceramic filter 3 through the third inlet 31, so that the second active material adsorbs a large amount of desulfurization catalysts in the second purifying liquid, a small amount of suspension flow and other impurities are contained, and oil exists, the third inlet 31 is arranged at the top, the third outlet 32 is arranged at the bottom, so that the second purifying liquid vertically flows through the second active material from top to bottom, the second purifying liquid can be fully contacted with the second active material, the adsorption capacity of the second active material is fully utilized, the adsorption quantity of the second active material on the desulfurization catalysts, the suspension sulfur, the impurities, the oil and other particulate matters is improved, and the purification effect on the OMC desulfurization waste liquid is greatly improved. After flowing through the second active material from top to bottom, the second purified liquid is discharged through the third outlet 32 of the third stage ceramic filter 3, forming a third purified liquid. In the third purified liquid, the chroma is reduced to below 250 ℃ (namely, less than or equal to 250 ℃), and the content of suspended matters is reduced to below 120mg/L (namely, less than or equal to 120 mg/L).
Fourthly, the third purified liquid is conveyed to a fourth-stage ceramic filter 4 through a liquid inlet valve group 11z, and the fourth-stage ceramic filter 4 is provided with a fourth inlet 41 and a fourth outlet 42; the fourth inlet 41 is connected to the third outlet 32; the fourth stage ceramic filter 4 comprises a second ceramic membrane disposed within the fourth stage ceramic filter 4 between the fourth inlet 41 and the fourth outlet 42. The fourth inlet is located at the bottom of the fourth ceramic filter 4 and the fourth outlet is located at the top of the fourth ceramic filter 4. The third purified liquid is fed to the lower part of the second ceramic membrane in the fourth-stage ceramic filter 4 through the fourth inlet 41, and the second ceramic membrane adsorbs suspended particulate matters, catalysts and oils in the third purified liquid. The fourth inlet is arranged at the bottom, the fourth outlet is arranged at the top, so that the third purifying liquid flows through the second ceramic membrane from bottom to top, a vertical flowing mode from bottom to top is adopted, when the third purifying liquid flows upwards, the third purifying liquid can be contacted with the pores of the second ceramic membrane more closely and fully, the third purifying liquid can flow back downwards for a certain distance due to the gravity of the waste liquid, the third purifying liquid is contacted with the pores of the second ceramic membrane again in the backflow process, part of suspended particles, catalysts and oils existing in the waste liquid are adsorbed, the backflow waste liquid can continue to flow upwards and can be contacted with the pores of the second ceramic membrane, and part of the suspended particles, the catalysts and the oils can be adsorbed. The adsorption quantity of suspended particles, catalysts and oils in the waste liquid is increased, and the adsorption capacity of the second ceramic membrane is improved. Therefore, the second ceramic membrane can further adsorb suspended sulfur, catalyst, oil and other impurities, so that the OMC desulfurization waste liquid is deeply purified, the purified third purified liquid is discharged through the fourth outlet 42 of the fourth-stage ceramic filter 4, and the discharged waste liquid is the fourth purified liquid. In the fourth purified liquid, the content of suspended matters can be reduced to be less than 20mg/L (namely less than or equal to 20mg/L), and the chroma is reduced to be less than 100 degrees (namely less than or equal to 100 degrees).
In addition, electric shut-off valves are arranged among the first-stage ceramic filter 1, the second-stage adsorption catalytic filter 2, the third-stage ceramic filter 3 and the fourth-stage ceramic filter 4, so that one of the 4 stages of filters can be used for cutting off liquid inlet and liquid discharge when necessary, and the filter can be operated independently.
Preferably, the purification method of the OMC desulfurization waste liquid further comprises: after the OMC desulfurization waste liquid is purified for a certain period of time, for example, the continuous operation time is 72 hours, various substances adsorbed in the first-stage ceramic filter 1, the second-stage adsorption catalytic filter 2, the third-stage ceramic filter 3 and the fourth-stage ceramic filter 4 are removed, and the first-stage ceramic filter 1 and the third-stage ceramic filter 3 are respectively subjected to backwashing by using reclaimed water. The backwashing operation is automatically carried out by an electric valve. The specific operation is as follows:
when rinsing first order ceramic filter 1, close feed liquor valves 2w, feed liquor valves 6x, open the motorised valve in proper order: namely, a backwash water valve group 3w, a backwash water valve group 4w and backwash water enter the first-stage ceramic filter 1 through a first outlet 12 to carry out backwash on the first ceramic membrane and the porous ceramic filter device, and the backwash water is discharged into the foam tank through the backwash water valve group 3w from a first inlet 11; after the backwashing time is reached, for example, 10 minutes, the backwashing water valve group 3w and the backwashing water valve group 4w are closed, and the backwashing water cleaned by the backwashing water flows to the foam tank through the backwashing water valve group 3 w. And then the liquid inlet valve group 2w and the liquid inlet valve group 6x are opened to enter a normal filtering state.
When cleaning second level adsorption catalysis filter 2, close inlet valve group 6x, inlet valve group 7y, open backwash water valves 10x, backwash water valves 8x in proper order, backwash water gets into in second level adsorption catalysis filter 2 through second export 22 and carries out the back flush to first active material, the backwash water of formation is arranged to the foam tank in through backwash water valves 10x by second entry 21, reach the back flush time after, for example 10 minutes, close backwash water valves 10x, backwash water valves 8 x. Then, the liquid inlet valve group 6x and the liquid inlet valve group 7y are opened to enter a normal filtering state.
When the third-stage ceramic filter 3 is cleaned, the liquid inlet valve group 7y and the liquid inlet valve group 11z are closed, the backwashing water valve group 14y and the backwashing water valve group 12y are sequentially opened, backwashing water enters the third-stage ceramic filter 3 through the third outlet 32 and backflushs the second active material, the backwashing water is discharged into the foam tank through the backwashing water valve group 14y from the third inlet 31, and after the backwashing time is reached, for example, 10 minutes, the backwashing water valve group 14y and the backwashing water valve group 12y are closed. Then the liquid inlet valve group 7y and the liquid inlet valve group 11z are opened to enter a normal filtering state.
When the fourth-stage ceramic filter 4 is cleaned, the liquid inlet valve group 11z and the liquid outlet valve group 15z are closed, the backwashing water valve group 18z and the backwashing water valve group 16z are sequentially opened, backwashing water enters the fourth-stage ceramic filter 4 through the fourth outlet 42 to backwash the second ceramic membrane, the backwashing water is discharged into the foam tank through the backwashing water valve group 18z from the fourth inlet 41, and after the backwashing time is up, for example, 10 minutes, the backwashing water valve group 18z and the backwashing water valve group 16z are closed. And then the liquid inlet valve group 11z and the liquid inlet valve group 15z are opened to enter a normal filtering state.
Preferably, after the first-stage ceramic filter 1, the second-stage adsorption catalytic filter 2, the third-stage ceramic filter 3 and the fourth-stage ceramic filter 4 are respectively back-cleaned by using reclaimed water, the first-stage ceramic filter 1, the second-stage adsorption catalytic filter 2, the third-stage ceramic filter 3 and the fourth-stage ceramic filter 4 are respectively back-cleaned by using steam (which may be low-pressure steam). The backwashing operation is automatically carried out by an electric valve. The specific operation is as follows:
when rinsing first order ceramic filter 1, after carrying out the backwashing to first order ceramic filter 1 through the normal water, open the motorised valve, promptly: backwash steam valves 5w, backwash steam enters the first-stage ceramic filter 1 through the first outlet 12 and carries out backwash on the first ceramic membrane and the porous ceramic filter device, formed backwash steam is discharged into the foam tank through the backwash steam valves 3w from the first inlet 11, and after the backwash time is up, for example, 10 minutes, the backwash steam valves 3w and the backwash steam valves 5w are closed. And then the liquid inlet valve group 2w and the liquid inlet valve group 6x are opened to enter a normal filtering state.
When the second-stage adsorption catalytic filter 2 is cleaned, after backwashing of the second-stage adsorption catalytic filter 2 is completed through recycled water, the backwashing steam valve group 9x is opened, backwashing steam enters the second-stage adsorption catalytic filter 2 through the second outlet 22 and further backwashes the first active material, the formed backwashing steam is discharged into the foam tank through the backwashing valve group 10x through the second inlet 21, and after backwashing time is reached, for example, 10 minutes, the backwashing valve group 10x and the backwashing steam valve group 9x are closed in sequence. Then, the liquid inlet valve group 6x and the liquid inlet valve group 7y are opened to enter a normal filtering state.
When the third-stage ceramic filter 3 is cleaned, after backwashing of the third-stage ceramic filter 3 is completed through reclaimed water, the backwashing steam valve bank 13y is opened, backwashing steam enters the third-stage ceramic filter 3 through the third outlet 32 and backwashes the second active material, the backwashing steam is discharged into the foam tank through the backwashing water valve bank 14y through the third inlet 31, and after backwashing time is reached, for example, 10 minutes, the backwashing water valve bank 14y and the backwashing steam valve bank 13y are sequentially closed. Then the liquid inlet valve group 7y and the liquid inlet valve group 11z are opened to enter a normal filtering state.
When the fourth stage ceramic filter 4 is cleaned, after the fourth stage ceramic filter 4 is back-cleaned through reclaimed water, the backwashing steam valve bank 17z is opened, backwashing steam enters the fourth stage ceramic filter 4 through the fourth outlet 42 to back-flush the second ceramic membrane, the backwashing steam is discharged into the foam tank through the backwashing water valve bank 18z from the fourth inlet 41, and after the backwashing time is reached, for example, 10 minutes, the backwashing water valve bank 18z and the backwashing steam valve bank 17z are closed. And then the liquid inlet valve group 11z and the liquid inlet valve group 15z are opened to enter a normal filtering state.
It should be understood that the specific order or hierarchy of steps in the processes disclosed above are examples of exemplary approaches. Based upon design preferences, it is understood that the specific order or hierarchy of steps in the actual production process may be rearranged without departing from the scope of the present disclosure. The accompanying method claims present elements of the various steps in a sample order, and are not intended to be limited to the specific order or hierarchy presented. The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A purification method of OMC desulfurization waste liquid is characterized by comprising the following steps:
step A: inputting the OMC desulfurization waste liquid into a first-stage ceramic filter (1), enabling the OMC desulfurization waste liquid to flow through a porous filter material, adsorbing suspended particulate matters and oils in the OMC desulfurization waste liquid through the porous filter material, and discharging the OMC desulfurization waste liquid after adsorbing the suspended particulate matters and the oils through the porous filter material to form first purified liquid; the porous filter material comprises: the ceramic filter comprises a first ceramic membrane and a porous ceramic filter device, wherein the porous ceramic filter device and the first ceramic membrane are arranged in a vertically communicated manner, and the porous ceramic filter device is arranged on the first ceramic membrane;
and B: inputting the first purified liquid into a second-stage adsorption catalytic filter (2), enabling the first purified liquid to flow through a first active material, enabling the first active material to adsorb suspended particles and oils in the first purified liquid, and discharging the first purified liquid with the suspended particles and oils adsorbed by the first active material to form second purified liquid;
and C: inputting the second purified liquid into a third-stage ceramic filter (3), enabling the second purified liquid to flow through a second active material, enabling the second active material to adsorb the desulfurization catalyst in the second purified liquid, and discharging the second purified liquid after the desulfurization catalyst is adsorbed by the second active material to form third purified liquid;
step D: and inputting the third purified liquid into a fourth-stage ceramic filter (4), enabling the third purified liquid to flow through a second ceramic membrane, adsorbing the suspended particles, the desulfurization catalyst and the oil in the third purified liquid by the second ceramic membrane, and discharging the third purified liquid after adsorbing the suspended particles, the desulfurization catalyst and the oil by the second ceramic membrane to form fourth purified liquid.
2. The method of purifying an OMC desulfurization waste liquid according to claim 1,
in step a: the OMC desulfurization waste liquid flows through the porous ceramic filtering device and the first ceramic membrane from top to bottom in sequence;
in step B: in the second-stage adsorption catalytic filter (2), the first purifying liquid flows through the first active material from top to bottom;
in step C: in the third-stage ceramic filter (3), the second purifying liquid flows through the second active material from top to bottom;
in step D: in the fourth-stage ceramic filter (4), the third purifying liquid flows through the second ceramic membrane from bottom to top.
3. The method according to claim 1, wherein the porous ceramic filter device comprises a porous ceramic, the porous ceramic is disposed on the first ceramic membrane, the porous ceramic is communicated with the first ceramic membrane, and the porosity of the porous ceramic is 39%.
4. The method of claim 3, wherein the first ceramic membrane has a porosity of 35% and a pore size range of: 0.5 to 2 μm.
5. The method for purifying OMC desulfurization waste liquid according to claim 2, wherein corundum ceramics for supporting the first active material is provided below the first active material, and the corundum ceramics is provided with a passage through which liquid purified by the first active material flows; the first purifying liquid flows through the channel of the corundum ceramic from top to bottom, and the first purifying liquid generates baffling in the channel of the corundum ceramic.
6. The method for purifying OMC desulfurization waste liquid according to claim 5, wherein the channel provided on the corundum ceramic is a plurality of filter tubes, and the gap between two adjacent filter tubes is different.
7. The method of claim 1, wherein all the pipes for carrying the OMC desulfurization waste liquid have a nominal diameter of 65mm and are made of 304 stainless steel.
8. The method for purifying the OMC desulfurization waste liquid according to claim 7, wherein the treatment capacity of the first-stage ceramic filter (1) and the second-stage adsorption catalytic filter (2) to the OMC desulfurization waste liquid is 15m3/h。
9. The method of purifying an OMC desulfurization waste liquid according to claim 1, further comprising:
after the OMC desulfurization waste liquid is purified for a certain time, the first-stage ceramic filter (1), the second-stage adsorption catalytic filter (2), the third-stage ceramic filter (3) and the fourth-stage ceramic filter (4) are respectively subjected to back cleaning by using reclaimed water.
10. The method for purifying OMC desulfurization waste liquid according to claim 9, wherein after backwashing the first ceramic filter (1), the second adsorption catalytic filter (2), the third ceramic filter (3) and the fourth ceramic filter (4) with recycled water, backwashing the first ceramic filter (1), the second adsorption catalytic filter (2), the third ceramic filter (3) and the fourth ceramic filter (4) with steam.
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