CN219885688U - System for titanium white is retrieved from useless SCR denitration catalyst to impregnation method - Google Patents
System for titanium white is retrieved from useless SCR denitration catalyst to impregnation method Download PDFInfo
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- CN219885688U CN219885688U CN202321247914.9U CN202321247914U CN219885688U CN 219885688 U CN219885688 U CN 219885688U CN 202321247914 U CN202321247914 U CN 202321247914U CN 219885688 U CN219885688 U CN 219885688U
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- 239000003054 catalyst Substances 0.000 title claims abstract description 50
- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000005470 impregnation Methods 0.000 title claims abstract description 15
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 title claims description 44
- 235000010215 titanium dioxide Nutrition 0.000 title description 18
- 239000002699 waste material Substances 0.000 claims abstract description 103
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 94
- 238000005406 washing Methods 0.000 claims abstract description 91
- 239000002893 slag Substances 0.000 claims abstract description 48
- 238000003756 stirring Methods 0.000 claims abstract description 16
- 239000001038 titanium pigment Substances 0.000 claims abstract description 8
- 238000010438 heat treatment Methods 0.000 claims abstract description 7
- 230000020477 pH reduction Effects 0.000 claims abstract description 5
- 239000002253 acid Substances 0.000 claims description 71
- 239000003513 alkali Substances 0.000 claims description 49
- 239000002351 wastewater Substances 0.000 claims description 27
- 239000007788 liquid Substances 0.000 claims description 24
- 239000004408 titanium dioxide Substances 0.000 claims description 21
- 238000006386 neutralization reaction Methods 0.000 claims description 12
- 238000001556 precipitation Methods 0.000 claims description 12
- 239000002033 PVDF binder Substances 0.000 claims description 7
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims description 7
- 230000008569 process Effects 0.000 claims description 5
- 230000002457 bidirectional effect Effects 0.000 claims description 3
- 238000004064 recycling Methods 0.000 abstract description 6
- 238000005516 engineering process Methods 0.000 abstract description 3
- 238000006243 chemical reaction Methods 0.000 description 10
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 6
- 239000007787 solid Substances 0.000 description 6
- 239000006228 supernatant Substances 0.000 description 5
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 239000003518 caustics Substances 0.000 description 3
- 238000007599 discharging Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000001914 filtration Methods 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 230000032798 delamination Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000007935 neutral effect Effects 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003472 neutralizing effect Effects 0.000 description 1
- 231100000572 poisoning Toxicity 0.000 description 1
- 230000000607 poisoning effect Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
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Abstract
The utility model discloses a system for recovering titanium pigment from a waste SCR denitration catalyst by an impregnation method, which comprises an alkalization-washing tank, wherein the alkalization-washing tank is provided with a heating device and an alkalization stirring device; a first filter, the slag water outlet of the alkalization-water washing box is connected with the inlet of the first filter; the slag water outlet of the first filter is connected with the inlet of the acidification-water washing tank, and the acidification-water washing tank is provided with an acidification stirring device; and the slag water outlet of the acidification-water washing tank is connected with the inlet of the second filter. The system for extracting titanium pigment in the waste SCR denitration catalyst by the impregnation method can realize engineering application of the waste SCR denitration catalyst recycling technology.
Description
Technical Field
The utility model belongs to the technical field of environment, and particularly relates to a system for recovering titanium dioxide from a waste SCR denitration catalyst by an impregnation method.
Background
The Selective Catalytic Reduction (SCR) technology is widely used for denitration technology of coal-fired power plants, and the conditions of pore canal blockage, serious abrasion, sintering, poisoning and the like can be gradually generated in the long-term use process, so that the activity of the catalyst is gradually reduced, and the service life is generally 3-5 years. Since the deactivated waste denitration catalyst contains V, W, as and other elements, if the deactivated waste denitration catalyst cannot be effectively disposed of, great resource waste and environmental pollution are caused. The amount of spent SCR catalyst is currently stabilized at 210000 ～ 240000m 3 The disposal of spent catalyst is therefore a highly desirable problem/year. The secondary recycling is the most effective method, and various valuable metals in the denitration catalyst are recycled, so that not only can the consumption of raw ores be reduced, but also the landfill treatment capacity can be effectively reduced, the environmental pressure is relieved, and good environmental and economic benefits are realized.
Disclosure of Invention
The utility model aims to overcome the defects in the prior art, and provides a system which is reasonable in structural design and is applied to recovering titanium dioxide from a waste SCR denitration catalyst by an impregnation method.
The utility model solves the problems by adopting the following technical scheme:
a system for recovering titanium dioxide from a waste SCR denitration catalyst by an impregnation method, comprising:
an alkalization-water washing box which is provided with a water inlet, a feed inlet, a waste alkali outlet and a slag outlet, and is internally provided with a heating device and an alkalization stirring device;
a first filter provided with a feed inlet, a slag outlet and a waste liquid outlet; the feed inlet of the first filter is connected with the slag water outlet of the alkalization-water washing tank;
the acidification-water washing box is provided with a feed inlet, an acid inlet, a water inlet, a slag outlet and a waste acid outlet; the feed inlet of the acidification-washing tank is connected with the slag outlet of the first filter, and an acidification stirring device is arranged in the acidification-washing tank;
a second filter provided with a feed inlet, a slag outlet and a waste liquid outlet; the feed inlet of the second filter is connected with the slag outlet of the acidification-water wash tank.
Optionally, the first filter is a PVDF filter.
Optionally, the second filter is a plate and frame filter press.
Optionally, a slag cake collecting bin is connected to the slag outlet of the second filter.
Optionally, the device further comprises a waste catalyst storage bin, wherein a waste catalyst outlet is arranged on the waste catalyst storage bin, and the waste catalyst outlet is connected with a feed inlet of the alkalization-washing box through a first conveyor belt.
Optionally, the slag outlet of the first filter is connected to the feed inlet of the acidification-washing tank by a second transfer.
Optionally, the alkalization-water washing tank is connected with an alkali tank through a waste alkali outlet, and a two-way pipeline is arranged between the waste alkali tank and the waste alkali outlet;
the acidification-water washing tank is connected with an acid tank, the acidification-water washing tank is connected with a waste acid tank through a waste acid outlet, and a bidirectional pipeline is arranged between the waste acid tank and the waste acid outlet.
Optionally, the system further comprises a neutralization precipitation tank; waste liquid outlets are formed in the waste alkali tank and the waste acid tank, and the waste liquid outlets in the waste alkali tank and the waste acid tank are connected with the neutralization precipitation tank. The neutralization precipitation tank has the functions that: after the acid liquor in the waste acid tank circulates for a certain number of times, the pH value of the waste acid can be regulated to be neutral by waste alkali liquor, and the precipitated solid is treated and then stored.
Optionally, the system further comprises a water tank, and the water inlet on the alkalization-washing tank and the water inlet on the acidification-washing tank are connected with the water tank.
Optionally, the system further comprises a wastewater tank; waste water ports are formed in the alkalization-washing tank and the acidification-washing tank, and waste water ports on the alkalization-washing tank and the acidification-washing tank, and waste liquid outlets on the first filter and the second filter are connected with the waste water tank.
After the acid liquor in the waste acid tank circulates for a certain number of times, the pH value of the waste acid can be regulated to be neutral by waste alkali liquor, and the precipitated solid is treated and then stored.
Compared with the prior art, the utility model has the following advantages and effects:
the system for recycling titanium dioxide from the waste SCR denitration catalyst by the impregnation method can treat a large amount of waste SCR denitration catalyst in batch, and can recycle titanium dioxide from the waste SCR denitration catalyst efficiently.
The reaction temperature can be well reduced by using the potassium hydroxide concentrated alkali liquor, and the energy consumption is effectively reduced. In the utility model, slag materials after the alkalization reaction of the system adopt acid washing, and soluble titanate generated in the acid washing reaction is dissolved in concentrated acid, so that acid liquor can be recycled. And after a certain number of circulation times, the pH value of the waste acid liquid can be regulated by the waste alkali liquid in the neutralization precipitation tank, titanium dioxide can be immediately separated out, the titanium dioxide is extracted, and all titanium sources can be reserved. Therefore, the concentrated acid and the concentrated alkali adopted in the impregnation method of the system can be recycled, the discharge of sewage is greatly reduced, and the operability is strong.
Drawings
Fig. 1 is a schematic diagram of the system of the present utility model.
The marks in the figure: 1. a spent catalyst storage bin; 2. an alkalization-water washing tank; 3. a PVDF filter; 4. an acidification-washing tank; 5. a plate frame filter; 6. a slag cake collecting bin; 7. an alkali tank; 8. a spent caustic tank; 9. an acid tank; 10. a waste acid tank; 11. a water tank; 12. a waste water tank; 13. a first conveyor belt; 14. a second conveyor belt; 15. and (5) neutralizing the precipitation tank.
Detailed Description
For a better description of the objects, technical solutions and advantages of the present utility model, the present utility model will be further described with reference to the following examples. It will be appreciated by persons skilled in the art that the specific embodiments described herein are for purposes of illustration only and are not intended to be limiting. The materials, reagents and the like used, unless otherwise specified, are all commercially available.
Example 1
A system for recovering titanium dioxide from a waste SCR denitration catalyst by an impregnation method, as shown in fig. 1, comprising: an alkalization-water washing tank, a first filter, an acidification-water washing tank and a second filter.
The system formed by mutually matching the structures achieves the effect of efficiently recycling the titanium pigment from the waste SCR denitration catalyst in batches.
Wherein, the alkalization-water washing tank 2 is provided with a water inlet, a feed inlet, a waste alkali outlet, a waste water outlet and a slag outlet, and a heating device and an alkalization stirring device are arranged in the alkalization-water washing tank; the heating device is used for heating the reaction of the alkali liquor and the waste SCR catalyst, and the stirring device is used for stirring the alkali liquor and the waste SCR catalyst, so that the reaction is uniformly carried out. The discharge port of the spent catalyst storage bin 1 is connected with the feed port of the alkalization-washing tank 2 through a first conveyor belt 13; the waste catalyst storage bin 1 stores the SCR catalyst powder subjected to ash removal and crushing.
The initial alkali liquor to be added in the alkalization-water washing tank 2 can directly enter the alkalization-water washing tank 2 through a feed inlet of the alkalization-water washing tank 2, or an alkali liquor inlet is additionally arranged on the alkalization-water washing tank 2, and the initial alkali liquor enters the alkalization-water washing tank 2 through the alkali liquor inlet. Specifically, the initial lye is temporarily stored in the lye tank 7, the lye tank 7 may be connected to the feed inlet, the initial lye therein is fed into the alkalization-water washing tank 2 together with the raw material through the feed inlet, and the lye tank 7 may be fed into the alkalization-water washing tank 2 through a separate lye inlet.
The alkalization-water washing tank 2 can be a tank body or two connected tank bodies, and when the tank body is a tank body, all inlets and outlets are arranged on the tank body; however, when the alkalizing-washing tank 2 is provided with two tanks, a first tank is provided with a feed inlet, an alkali liquor inlet, a waste alkali outlet and a slag water outlet, and a second tank is provided with a water inlet, a slag water outlet and a feed inlet communicated with the slag water outlet on the first tank, so that alkali washing and water washing are respectively carried out in different tanks. In this embodiment, a case is preferably used, as shown in fig. 1.
The waste alkali outlet on the alkalization-water washing box 2 is connected with a waste alkali tank 8, and the alkali liquid can be temporarily stored in the waste alkali tank 8 for standby after being used once. The alkali liquor discharged from the waste alkali outlet can be repeatedly utilized, and when the waste alkali outlet is required to be repeatedly utilized for a plurality of times, the waste alkali outlet is communicated with the waste alkali tank through a two-way pipeline, so that the two-way conveying between the waste alkali tank and the alkalization-washing tank is realized.
The supernatant liquid after washing in the alkalization-washing tank 2 enters a wastewater tank from a wastewater port, and the rest of slag water is pumped into a first filter.
The first filter is a PVDF filter 3, and a slag water outlet of the alkalization-water washing tank 3 is connected with a feed inlet of the PVDF filter 3; the solid slag filtered by the PVDF filter 3 enters the acidification-water washing tank 4 through the second conveyor belt 14, and the wastewater formed by filtration enters the wastewater tank 12 through the wastewater outlet.
The acidification-water washing tank 4 is provided with a water inlet, a feed inlet, a waste acid outlet, a waste water outlet and a slag outlet, and an acidification stirring device is arranged in the acidification-water washing tank; the acidification stirring device is used for stirring the acid liquor and the waste SCR catalyst so as to uniformly carry out the reaction. The acid liquor to be added in the acidification-water washing tank 4 can directly enter the acidification-water washing tank 4 through a feed inlet of the acidification-water washing tank 4, or an acid liquor inlet is additionally arranged on the acidification-water washing tank 4, and the initial acid liquor enters the acidification-water washing tank 4 through the acid liquor inlet. Specifically, the acid solution can be temporarily stored in the acid tank 9, the acid tank 9 can be communicated with the feed inlet, wherein the acid solution enters the acidification-water washing tank 4 together with the raw materials through the feed inlet, and the acid tank 9 can also enter the acidification-water washing tank 4 through a separate acid solution inlet.
The waste alkali outlet on the acidification-water washing tank 4 is connected with a waste acid tank 10, and the acid liquor can be temporarily stored in the waste acid tank 10 for standby after being used once. The acid liquor discharged from the waste acid outlet can be repeatedly utilized, and when the waste acid outlet is required to be repeatedly utilized, the waste acid outlet is communicated with the waste acid tank 10 through a two-way pipeline, so that the two-way conveying between the waste alkali tank 10 and the acidification-water washing tank 4 is realized.
The acidification-water washing tank 4 can be one tank body or two connected tank bodies, and when the acidification-water washing tank is one tank body, all inlets and outlets are arranged on the tank body; however, when the acidification-water washing tank 4 is provided with two tanks, a feed inlet, an acid liquid inlet, a waste acid outlet and a slag outlet can be arranged on the first tank, and a water inlet, a slag water outlet and a feed inlet communicated with the slag water outlet on the first tank are arranged on the second tank, so that the acid washing and the water washing are respectively carried out in different tanks. In this embodiment, a case is preferably used, as shown in fig. 1.
The supernatant liquid after washing in the acidification-washing tank 4 enters the wastewater tank 12 from the wastewater port, and the residual slag water is pumped into the second filter through the slag outlet.
The second filter is a plate-and-frame filter press 5, and the slag outlet of the acidification-water wash tank 4 is connected with the inlet of the plate-and-frame filter press 5. The plate and frame filter press 5 presses the incoming slag water into slag cakes, which are transported from the slag cakes to the slag cake collection bin 6, and the filtered wastewater enters the wastewater tank 12 through a wastewater outlet.
The system further comprises a water tank 11, the water tank 11 supplying water to the water inlets of the alkalization-washing tank 2 and the acidification-washing tank 4.
The system also comprises a neutralization precipitation tank 15, wherein the neutralization precipitation tank 15 is connected with neutralization outlets arranged on the spent caustic tank 8 and the spent acid tank 10. Since the acid solution reacts with the spent catalyst to form soluble titanate, the spent acid solution of the spent acid tank 10 contains soluble titanate. The waste acid liquid reacts with the waste alkali liquid in the neutralization precipitation tank 15, so that titanium dioxide precipitate can be separated out, and the recovery rate of the titanium dioxide source is improved by extracting the titanium dioxide.
The working process of the utility model is as follows:
the waste SCR denitration catalyst is pretreated and then placed in a catalyst storage bin 1, the catalyst in the catalyst storage bin 1 is conveyed into an alkalization-water washing box 2 through a conveying belt, and alkali liquor in an alkali tank 7 is added into the alkalization-water washing box 2 for stirring and heating reaction for 5 hours. After the reaction is finished, standing the upper layer and the lower layer for solid-liquid separation, recycling the supernatant into the waste alkali tank 8, opening the water tank 11, flowing a large amount of water into the alkalization-washing tank, fully stirring and standing, recycling the supernatant into the waste water tank 12, extracting the rest solid slag into the PVDF filter 3 for filtering, conveying the filtered slag into the acidification-washing tank through a conveying belt, and discharging the waste water into the waste water tank 12. Opening a water tank, adding water into the acidification-washing tank 4, fully stirring until solid-liquid delamination appears, opening an acid tank 9, allowing acid liquor to flow into the acidification-washing tank 4, removing upper-layer acid liquor to be discharged into a waste acid tank 10 when the pH value of supernatant is 1, opening a water tank 11, allowing a large amount of water to flow into the acidification-washing tank 4, fully stirring, standing for delamination, discharging upper-layer waste liquid into a waste water tank 12, extracting lower-layer solid slag into a plate-frame filter 5, storing pressed slag cakes in a slag cake filtering bin, and discharging waste water into the waste water tank 12. In the experimental process, the alkali liquor in the spent caustic tank 8 and the acid liquor in the spent acid tank 10 can be recycled according to actual reaction conditions, and the acid liquor and the spent catalyst can form soluble titanate after reaction, so that the acid liquor in the spent acid tank 10 contains the soluble titanate. After a certain number of circulation times, the liquid in the waste alkali tank 8 and the waste acid tank 10 can be introduced into the neutralization precipitation tank 15, the waste acid liquid and the waste alkali liquid react in the neutralization precipitation tank 15, titanium dioxide precipitate is separated out, and the recovery rate of the titanium dioxide source is improved by extracting the titanium dioxide. And the produced solid titanium dioxide is collected, and the recovery rate of the titanium dioxide can reach 91-95 percent.
Furthermore, the foregoing description of the utility model is provided by way of example only. All equivalent changes in construction, features and principles of the utility model according to the inventive concept are intended to be encompassed by the scope of the utility model. Those skilled in the art may make various modifications, additions and substitutions to the described embodiments without departing from the scope of the utility model as defined in the accompanying claims.
Claims (10)
1. A system for recovering titanium dioxide from a spent SCR denitration catalyst by an impregnation method, comprising:
an alkalization-water washing box which is provided with a water inlet, a feed inlet, a waste alkali outlet and a slag outlet, and is internally provided with a heating device and an alkalization stirring device;
a first filter provided with a feed inlet, a slag outlet and a waste liquid outlet; the feed inlet of the first filter is connected with the slag water outlet of the alkalization-water washing tank;
the acidification-water washing box is provided with a feed inlet, an acid inlet, a water inlet, a slag outlet and a waste acid outlet; the feed inlet of the acidification-washing tank is connected with the slag outlet of the first filter, and an acidification stirring device is arranged in the acidification-washing tank;
a second filter provided with a feed inlet, a slag outlet and a waste liquid outlet; the feed inlet of the second filter is connected with the slag outlet of the acidification-water wash tank.
2. The system for recovering titanium dioxide from a spent SCR denitration catalyst according to claim 1, wherein the first filter is a PVDF filter.
3. The system for recovering titanium dioxide from a spent SCR denitration catalyst according to claim 1, wherein the second filter is a plate and frame filter press.
4. A system for recovering titanium pigment from a spent SCR denitration catalyst by an impregnation process as defined in claim 3, wherein the slag outlet of the second filter is connected with a slag cake collection bin.
5. The system for recovering titanium pigment from a waste SCR denitration catalyst by an impregnation method according to claim 1, further comprising a waste catalyst storage bin, wherein a waste catalyst outlet is provided on the waste catalyst storage bin, and the waste catalyst outlet is connected with a feed inlet of the alkalization-washing tank through a first conveyor belt.
6. The system for recovering titanium pigment from a spent SCR denitration catalyst according to claim 1, wherein the slag outlet of the first filter is connected to the feed inlet of the acidification-washing tank via a second transfer.
7. The system for recovering titanium pigment from a waste SCR denitration catalyst by an impregnation method according to claim 1, wherein the alkalization-water washing tank is connected with an alkali tank by a waste alkali outlet, and a bidirectional pipeline is arranged between the waste alkali tank and the waste alkali outlet;
the acidification-water washing tank is connected with an acid tank, the acidification-water washing tank is connected with a waste acid tank through a waste acid outlet, and a bidirectional pipeline is arranged between the waste acid tank and the waste acid outlet.
8. The system for recovering titanium dioxide from a spent SCR denitration catalyst by the impregnation process as recited in claim 7, wherein said system further comprises a neutralization precipitation tank; waste liquid outlets are formed in the waste alkali tank and the waste acid tank, and the waste liquid outlets in the waste alkali tank and the waste acid tank are connected with the neutralization precipitation tank.
9. The system for recovering titanium pigment from a spent SCR denitration catalyst according to claim 1, wherein the system further comprises a water tank, and the water inlet of the alkalization-washing tank and the water inlet of the acidification-washing tank are connected to the water tank.
10. The system for recovering titanium dioxide from a spent SCR denitration catalyst according to claim 1, wherein the system further comprises a waste water tank; waste water ports are formed in the alkalization-washing tank and the acidification-washing tank, and waste water ports on the alkalization-washing tank and the acidification-washing tank, and waste liquid outlets on the first filter and the second filter are connected with the waste water tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321247914.9U CN219885688U (en) | 2023-05-22 | 2023-05-22 | System for titanium white is retrieved from useless SCR denitration catalyst to impregnation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321247914.9U CN219885688U (en) | 2023-05-22 | 2023-05-22 | System for titanium white is retrieved from useless SCR denitration catalyst to impregnation method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219885688U true CN219885688U (en) | 2023-10-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321247914.9U Active CN219885688U (en) | 2023-05-22 | 2023-05-22 | System for titanium white is retrieved from useless SCR denitration catalyst to impregnation method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219885688U (en) |
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2023
- 2023-05-22 CN CN202321247914.9U patent/CN219885688U/en active Active
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