CN112850768A - Method for recovering powdery calcium fluoride product from calcium fluoride sludge resource - Google Patents
Method for recovering powdery calcium fluoride product from calcium fluoride sludge resource Download PDFInfo
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- CN112850768A CN112850768A CN202110162971.6A CN202110162971A CN112850768A CN 112850768 A CN112850768 A CN 112850768A CN 202110162971 A CN202110162971 A CN 202110162971A CN 112850768 A CN112850768 A CN 112850768A
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- calcium fluoride
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- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 title claims abstract description 221
- 229910001634 calcium fluoride Inorganic materials 0.000 title claims abstract description 213
- 239000010802 sludge Substances 0.000 title claims abstract description 132
- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000001704 evaporation Methods 0.000 claims abstract description 24
- 230000008020 evaporation Effects 0.000 claims abstract description 24
- 238000001035 drying Methods 0.000 claims abstract description 19
- 239000000428 dust Substances 0.000 claims description 39
- 239000000047 product Substances 0.000 claims description 22
- 239000007789 gas Substances 0.000 claims description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 11
- 238000003860 storage Methods 0.000 claims description 7
- 239000013589 supplement Substances 0.000 claims description 7
- 239000002912 waste gas Substances 0.000 claims description 7
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 6
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 6
- 239000004571 lime Substances 0.000 claims description 6
- 230000018044 dehydration Effects 0.000 claims description 5
- 238000006297 dehydration reaction Methods 0.000 claims description 5
- 238000004806 packaging method and process Methods 0.000 claims description 5
- 238000003825 pressing Methods 0.000 claims description 5
- 238000004065 wastewater treatment Methods 0.000 claims description 5
- 239000010436 fluorite Substances 0.000 abstract description 8
- 229910052500 inorganic mineral Inorganic materials 0.000 abstract description 8
- 239000011707 mineral Substances 0.000 abstract description 8
- 239000000843 powder Substances 0.000 abstract description 8
- 239000000463 material Substances 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical group [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 239000002910 solid waste Substances 0.000 description 2
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 1
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910001424 calcium ion Inorganic materials 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- -1 fluoride ions Chemical class 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000008267 milk Substances 0.000 description 1
- 210000004080 milk Anatomy 0.000 description 1
- 235000013336 milk Nutrition 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F11/00—Compounds of calcium, strontium, or barium
- C01F11/20—Halides
- C01F11/22—Fluorides
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/80—Compositional purity
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Inorganic Chemistry (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
- Treatment Of Sludge (AREA)
Abstract
A method for recovering a powdery calcium fluoride product from a calcium fluoride sludge resource, aiming at solving the problem that the calcium fluoride sludge cannot be reasonably and effectively utilized. The key points of the technical scheme are as follows: the method comprises the following steps: (1) collecting and storing calcium fluoride wet sludge; (2) steam drying to obtain granular calcium fluoride; (3) carrying out micronization by flash evaporation equipment to obtain powdery calcium fluoride; (4) and (4) collecting and storing the powdery calcium fluoride product. According to the invention, the wet calcium fluoride sludge is dried to form granular calcium fluoride, the moisture content is dried to 1-3% through flash evaporation equipment, and the granular calcium fluoride is micronized to obtain powdery calcium fluoride, wherein the effective content of the calcium fluoride can reach 70-90%, and the powdery calcium fluoride meets the use standard of fluorite mineral powder and can be used as a substitute for the fluorite mineral powder.
Description
Technical Field
The invention relates to the technical field of calcium fluoride sludge treatment, in particular to a method for recovering a powdery calcium fluoride product from a calcium fluoride sludge resource.
Background
The method is characterized in that a photovoltaic enterprise needs to corrode and clean silicon cores and silicon crystals in the production process, high-concentration fluorine-containing acidic wastewater can be formed, lime milk is adopted for neutralization and precipitation treatment, a large amount of calcium fluoride sludge can be formed, and the content of calcium fluoride in the calcium fluoride sludge of the photovoltaic enterprise can reach 80-95% according to knowledge and detection of the calcium fluoride sludge of the photovoltaic enterprise.
The solid waste belongs to common industrial solid waste, the existing disposal mode is mainly landfill and cannot be reasonably and effectively utilized, so that resource waste and land occupation are caused.
Therefore, the invention provides a technical scheme, aiming at solving the problem that calcium fluoride sludge cannot be reasonably and effectively utilized.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a method for recovering a powdery calcium fluoride product from a calcium fluoride sludge resource.
The technical purpose of the invention is realized by the following technical scheme: a method for recovering a powdery calcium fluoride product from a calcium fluoride sludge resource comprises the following steps:
(1) collecting and storing calcium fluoride wet sludge: conveying the wet calcium fluoride sludge with 80-95% of calcium fluoride to a wet sludge bin by a grab bucket or a conveyer belt for storing the wet calcium fluoride sludge;
(2) steam drying to obtain granular calcium fluoride: uniformly feeding the wet calcium fluoride sludge in the wet sludge bin to a dryer through a conveying belt, drying the wet calcium fluoride sludge in the dryer by adopting steam at the temperature of 175-185 ℃, and converting the wet calcium fluoride sludge into granular calcium fluoride after drying the water content of the wet calcium fluoride sludge to 10-20%;
(3) and (3) carrying out micronization by flash evaporation equipment to obtain powdery calcium fluoride: the granular calcium fluoride enters flash evaporation equipment from an outlet at the bottom end of the dryer, the flash evaporation working temperature is controlled to be 195-205 ℃, the granular calcium fluoride with the water content of 10-20% is dried to be 1-3%, and the granular calcium fluoride is micronized to obtain powdery calcium fluoride;
(4) collection and storage of the powdered calcium fluoride product: powdery calcium fluoride enters the cyclone bag type dust collector from the outlet of the flash evaporation equipment for collection, and the collected powdery calcium fluoride is conveyed by the fan to enter the dry sludge bin for storing the powdery calcium fluoride.
By adopting the technical scheme, after the calcium fluoride sludge produced by photovoltaic enterprises is dried to 10-20%, the wet calcium fluoride sludge is converted into granular calcium fluoride, the water content of the granular calcium fluoride is dried to 1-3% through flash evaporation equipment and micronized to obtain powdery calcium fluoride, the content of the calcium fluoride in the calcium fluoride sludge produced by the photovoltaic enterprises is 80-95%, the effective content of the calcium fluoride in the powdery calcium fluoride formed after drying can reach 70-90%, the calcium fluoride meets the use standard of fluorite mineral powder, and the calcium fluoride can be used as a substitute for the fluorite mineral powder.
Preferably, in the step (1), before the wet calcium fluoride sludge is stored in the wet sludge bin, the wet calcium fluoride sludge is subjected to a pretreatment operation, and the pretreatment operation comprises a wastewater treatment process and the addition of excessive lime.
By adopting the technical scheme, the calcium fluoride precipitate formed by the fluoride ions and the calcium ions in the wet calcium fluoride sludge is ensured.
Preferably, the pretreatment operation further comprises filter-pressing dehydration, so that the moisture content of the calcium fluoride wet sludge is lower than 60%.
By adopting the technical scheme, when the moisture content of the wet calcium fluoride sludge is lower than 60%, the form of the wet calcium fluoride sludge mainly takes solid state as a main part, and the wet calcium fluoride sludge can not form dripping water in a natural state, so that leachate can not be generated basically during the storage of the wet calcium fluoride sludge.
Preferably, in the step (3), a small part of the granular calcium fluoride is conveyed to the second bag-type dust remover through a fan and a pipeline in the form of dust-containing waste gas together with high-temperature gas in the dryer through a top outlet of the dryer for high-altitude discharge after treatment.
By adopting the technical scheme, the dust-containing waste gas is discharged at high altitude, and pollution is avoided.
Preferably, the dust collected by the second bag-type dust collector returns to the wet sludge bin through a pipeline to be mixed with the calcium fluoride wet sludge in the wet sludge.
Through adopting above-mentioned technical scheme, the resource has been saved more to the recovery of dust is recycled, on the one hand, and on the other hand passes through the dust and mixes with the wet mud of calcium fluoride, guarantees that the moisture content of the wet mud of calcium fluoride is less than 60%.
Preferably, a stirrer is arranged in the wet sludge bin.
Through adopting above-mentioned technical scheme, the setting of mixer can make dust and the wet mud of calcium fluoride mix more abundant.
Preferably, in the step (4), the powdery calcium fluoride stored in the dry sludge bin is hermetically packaged by a packaging machine.
Through adopting above-mentioned technical scheme, likepowder calcium fluoride in time carries out seal packing through packagine machine, avoids likepowder calcium fluoride to wet.
Preferably, in the step (4), the tail gas of the cyclone bag type dust collector is introduced into the dryer for air supplement.
By adopting the technical scheme, the tail gas temperature of the cyclone bag type dust collector is higher, the tail gas is returned to the front section dryer to be used as air supplement, an exhaust funnel is not arranged, and the pollution to the environment is reduced.
By adopting the technical scheme, the invention has the beneficial effects that:
1. drying the wet calcium fluoride sludge to form granular calcium fluoride, drying the water content of the granular calcium fluoride to 1-3% through flash evaporation equipment, and micronizing to obtain powdery calcium fluoride, wherein the effective content of the calcium fluoride can reach 70-90%, and the powdery calcium fluoride meets the use standard of fluorite mineral powder and can be used as a substitute for the fluorite mineral powder.
2. Essentially no leachate is produced during storage of the calcium fluoride wet sludge.
3. The dust-containing waste gas is discharged at high altitude, so that pollution is avoided.
4. The recycling of dust has saved the resource on the one hand more, and on the other hand passes through the dust and mixes with the wet mud of calcium fluoride, guarantees that the moisture content of the wet mud of calcium fluoride is less than 60%.
5. The tail gas temperature of the cyclone bag type dust collector is higher, the tail gas returns to the front section dryer to be used as air supplement, an exhaust funnel is not arranged, and the pollution to the environment is reduced.
Drawings
FIG. 1 is a process flow diagram of a method for recovering a powdery calcium fluoride product from a calcium fluoride sludge resource according to the present invention.
Detailed Description
The technical solution of the present invention is further defined below with reference to the specific embodiments, but the scope of the claims is not limited to the description.
The first embodiment is as follows:
a method for recovering a powdery calcium fluoride product from a calcium fluoride sludge resource comprises the following steps:
(1) collecting and storing calcium fluoride wet sludge: conveying the wet calcium fluoride sludge with 80 percent of calcium fluoride to a wet sludge bin by a grab bucket or a conveyer belt for storing the wet calcium fluoride sludge;
(2) steam drying to obtain granular calcium fluoride: uniformly feeding the wet calcium fluoride sludge in the wet sludge bin to a dryer through a conveying belt, drying the wet calcium fluoride sludge in the dryer by adopting steam at 175 ℃, and converting the wet calcium fluoride sludge into granular calcium fluoride after drying the wet calcium fluoride sludge to reach 20%;
(3) and (3) carrying out micronization by flash evaporation equipment to obtain powdery calcium fluoride: the granular calcium fluoride enters flash evaporation equipment from an outlet at the bottom end of the dryer, the flash evaporation working temperature is controlled at 195 ℃, the granular calcium fluoride with the water content of 20 percent is dried to 3 percent and is micronized to obtain powdery calcium fluoride;
(4) collection and storage of the powdered calcium fluoride product: powdery calcium fluoride enters the cyclone bag type dust collector from the outlet of the flash evaporation equipment for collection, and the collected powdery calcium fluoride is conveyed by the fan to enter the dry sludge bin for storing the powdery calcium fluoride.
Preferably, in the step (1), before the wet calcium fluoride sludge is stored in the wet sludge bin, the wet calcium fluoride sludge is subjected to a pretreatment operation, and the pretreatment operation comprises a wastewater treatment process and the addition of excessive lime.
Preferably, the pretreatment operation further comprises filter-pressing dehydration, so that the moisture content of the calcium fluoride wet sludge is 60%.
Preferably, in the step (3), a small part of the granular calcium fluoride is conveyed to the second bag-type dust remover through the top outlet of the dryer in the form of dust-containing waste gas through the fan and the pipeline for treatment and then discharged at high altitude together with the high-temperature gas in the dryer.
Preferably, the dust collected by the second bag-type dust collector is returned to the wet sludge bin through a pipeline to be mixed with the calcium fluoride wet sludge in the wet sludge material.
Preferably, a stirrer is arranged in the wet sludge bin.
Preferably, in the step (4), the powdery calcium fluoride stored in the dry sludge bin is hermetically packaged by a packaging machine.
Preferably, in the step (4), the tail gas of the cyclone bag type dust collector is introduced into the dryer for air supplement.
Example two:
a method for recovering a powdery calcium fluoride product from a calcium fluoride sludge resource comprises the following steps:
(1) collecting and storing calcium fluoride wet sludge: conveying the calcium fluoride wet sludge with the calcium fluoride content of 90% to a wet sludge bin by a grab bucket or a conveyer belt for storing the calcium fluoride wet sludge;
(2) steam drying to obtain granular calcium fluoride: uniformly feeding the wet calcium fluoride sludge in the wet sludge bin to a dryer through a conveying belt, drying the wet calcium fluoride sludge in the dryer by adopting steam at 180 ℃, and converting the wet calcium fluoride sludge into granular calcium fluoride after drying the wet calcium fluoride sludge to reach 15%;
(3) and (3) carrying out micronization by flash evaporation equipment to obtain powdery calcium fluoride: the granular calcium fluoride enters flash evaporation equipment from an outlet at the bottom end of the dryer, the flash evaporation working temperature is controlled at 200 ℃, the granular calcium fluoride with the water content of 15 percent is dried to 2 percent and is micronized to obtain powdery calcium fluoride;
(4) collection and storage of the powdered calcium fluoride product: powdery calcium fluoride enters the cyclone bag type dust collector from the outlet of the flash evaporation equipment for collection, and the collected powdery calcium fluoride is conveyed by the fan to enter the dry sludge bin for storing the powdery calcium fluoride.
Preferably, in the step (1), before the wet calcium fluoride sludge is stored in the wet sludge bin, the wet calcium fluoride sludge is subjected to a pretreatment operation, and the pretreatment operation comprises a wastewater treatment process and the addition of excessive lime.
Preferably, the pretreatment operation further comprises filter-pressing dehydration, so that the moisture content of the calcium fluoride wet sludge is 60%.
Preferably, in the step (3), a small part of the granular calcium fluoride is conveyed to the second bag-type dust remover through the top outlet of the dryer in the form of dust-containing waste gas through the fan and the pipeline for treatment and then discharged at high altitude together with the high-temperature gas in the dryer.
Preferably, the dust collected by the second bag-type dust collector is returned to the wet sludge bin through a pipeline to be mixed with the calcium fluoride wet sludge in the wet sludge material.
Preferably, a stirrer is arranged in the wet sludge bin.
Preferably, in the step (4), the powdery calcium fluoride stored in the dry sludge bin is hermetically packaged by a packaging machine.
Preferably, in the step (4), the tail gas of the cyclone bag type dust collector is introduced into the dryer for air supplement.
Example three:
a method for recovering a powdery calcium fluoride product from a calcium fluoride sludge resource comprises the following steps:
(1) collecting and storing calcium fluoride wet sludge: conveying the calcium fluoride wet sludge with the calcium fluoride content of 95% to a wet sludge bin by a grab bucket or a conveyer belt for storing the calcium fluoride wet sludge;
(2) steam drying to obtain granular calcium fluoride: uniformly feeding the wet calcium fluoride sludge in the wet sludge bin to a dryer through a conveying belt, drying the wet calcium fluoride sludge in the dryer by adopting steam at 185 ℃, and converting the wet calcium fluoride sludge into granular calcium fluoride after drying the wet calcium fluoride sludge to 10% of water content;
(3) and (3) carrying out micronization by flash evaporation equipment to obtain powdery calcium fluoride: the granular calcium fluoride enters flash evaporation equipment from an outlet at the bottom end of the dryer, the flash evaporation working temperature is controlled at 205 ℃, the granular calcium fluoride with the water content of 10 percent is dried to 1 percent and is micronized to obtain powdery calcium fluoride;
(4) collection and storage of the powdered calcium fluoride product: powdery calcium fluoride enters the cyclone bag type dust collector from the outlet of the flash evaporation equipment for collection, and the collected powdery calcium fluoride is conveyed by the fan to enter the dry sludge bin for storing the powdery calcium fluoride.
Preferably, in the step (1), before the wet calcium fluoride sludge is stored in the wet sludge bin, the wet calcium fluoride sludge is subjected to a pretreatment operation, and the pretreatment operation comprises a wastewater treatment process and the addition of excessive lime.
Preferably, the pretreatment operation further comprises filter-pressing dehydration, so that the moisture content of the calcium fluoride wet sludge is 60%.
Preferably, in the step (3), a small part of the granular calcium fluoride is conveyed to the second bag-type dust remover through the top outlet of the dryer in the form of dust-containing waste gas through the fan and the pipeline for treatment and then discharged at high altitude together with the high-temperature gas in the dryer.
Preferably, the dust collected by the second bag-type dust collector is returned to the wet sludge bin through a pipeline to be mixed with the calcium fluoride wet sludge in the wet sludge material.
Preferably, a stirrer is arranged in the wet sludge bin.
Preferably, in the step (4), the powdery calcium fluoride stored in the dry sludge bin is hermetically packaged by a packaging machine.
Preferably, in the step (4), the tail gas of the cyclone bag type dust collector is introduced into the dryer for air supplement.
The implementation effects of the first embodiment, the second embodiment and the third embodiment are counted, and the results are shown in table 1:
TABLE 1
| Calcium fluoride content (%) | |
| Example one | 70 |
| Practice ofExample two | 80 |
| EXAMPLE III | 89 |
As is clear from table 1, the calcium fluoride content in the powdery calcium fluoride formed in each of examples one, two and three was 70% or more. The method for recovering the powdery calcium fluoride product from the calcium fluoride sludge resource can effectively utilize the calcium fluoride sludge to obtain powdery calcium fluoride meeting the use standard of fluorite mineral powder, and the powdery calcium fluoride is used for replacing the fluorite mineral powder.
It should be noted that the above examples and test examples are only for further illustration and understanding of the technical solutions of the present invention, and are not to be construed as further limitations of the technical solutions of the present invention, and the invention which does not highlight essential features and significant advances made by those skilled in the art still belongs to the protection scope of the present invention.
Claims (8)
1. A method for recovering a powdery calcium fluoride product from a calcium fluoride sludge resource is characterized by comprising the following steps:
(1) collecting and storing calcium fluoride wet sludge: conveying the wet calcium fluoride sludge with 80-95% of calcium fluoride to a wet sludge bin by a grab bucket or a conveyer belt for storing the wet calcium fluoride sludge;
(2) steam drying to obtain granular calcium fluoride: uniformly feeding the wet calcium fluoride sludge in the wet sludge bin to a dryer through a conveying belt, drying the wet calcium fluoride sludge in the dryer by adopting steam at the temperature of 175-185 ℃, and converting the wet calcium fluoride sludge into granular calcium fluoride after drying the water content of the wet calcium fluoride sludge to 10-20%;
(3) and (3) carrying out micronization by flash evaporation equipment to obtain powdery calcium fluoride: the granular calcium fluoride enters flash evaporation equipment from an outlet at the bottom end of the dryer, the flash evaporation working temperature is controlled to be 195-205 ℃, the granular calcium fluoride with the water content of 10-20% is dried to be 1-3%, and the granular calcium fluoride is micronized to obtain powdery calcium fluoride;
(4) collection and storage of the powdered calcium fluoride product: powdery calcium fluoride enters the cyclone bag type dust collector from the outlet of the flash evaporation equipment for collection, and the collected powdery calcium fluoride is conveyed by the fan to enter the dry sludge bin for storing the powdery calcium fluoride.
2. The method for recovering the powdery calcium fluoride product from the calcium fluoride sludge resource as claimed in claim 1, wherein in the step (1), the wet calcium fluoride sludge is subjected to a pretreatment operation before being stored in a wet sludge bin, and the pretreatment operation comprises a wastewater treatment process and the addition of excess lime.
3. The method for recovering the powdery calcium fluoride product from the calcium fluoride sludge resource as claimed in claim 2, wherein the pretreatment operation further comprises filter-pressing dehydration to make the moisture content of the wet calcium fluoride sludge lower than 60%.
4. The method for recovering the powdery calcium fluoride product from the calcium fluoride sludge resource as claimed in claim 1, wherein in the step (3), a small part of granular calcium fluoride is conveyed to the second bag-type dust remover through a top outlet of the dryer in the form of dust-containing waste gas by a fan and a pipeline together with high-temperature gas in the dryer for high-altitude discharge after treatment.
5. The method for recovering the powdery calcium fluoride product from the calcium fluoride sludge resource as claimed in claim 4, wherein the dust collected by the second bag-type dust remover is returned to the wet sludge bin through a pipeline to be mixed with the wet calcium fluoride sludge in the wet sludge.
6. The method for recovering the powdery calcium fluoride product from the calcium fluoride sludge resource as claimed in claim 5, wherein a stirrer is arranged in the wet sludge bin.
7. The method for recovering the powdery calcium fluoride product from the calcium fluoride sludge resource as claimed in claim 1, wherein in the step (4), the powdery calcium fluoride stored in the dry sludge bin is hermetically packaged by a packaging machine.
8. The method for recovering the powdery calcium fluoride product from the calcium fluoride sludge resource as claimed in claim 1, wherein in the step (4), the tail gas of the cyclone bag type dust collector is introduced into the dryer for air supplement.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202110162971.6A CN112850768A (en) | 2021-02-05 | 2021-02-05 | Method for recovering powdery calcium fluoride product from calcium fluoride sludge resource |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110162971.6A CN112850768A (en) | 2021-02-05 | 2021-02-05 | Method for recovering powdery calcium fluoride product from calcium fluoride sludge resource |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6256902B1 (en) * | 1998-11-03 | 2001-07-10 | John R. Flaherty | Apparatus and method for desiccating and deagglomerating wet, particulate materials |
| US6723139B1 (en) * | 1998-12-30 | 2004-04-20 | Atofina | Method for recycling fine calcium fluoride powder |
| CN201981106U (en) * | 2010-10-29 | 2011-09-21 | 华南理工大学 | Complete set of equipment for step-by-step sludge drying through hot tail gas of boiler |
| WO2013026263A1 (en) * | 2011-08-22 | 2013-02-28 | 广州普得环保设备有限公司 | Method for retreating dewatered sludge |
| TWM467518U (en) * | 2013-07-08 | 2013-12-11 | Siang Fong Sheng Corp | Equipment for fabricating fluorite balls using calcium fluoride sludge |
| CN104955343A (en) * | 2013-12-16 | 2015-09-30 | 纽特林西克公司 | Methods of processing waste activated sludge |
| CN106986368A (en) * | 2017-03-13 | 2017-07-28 | 李德寿 | A kind of preparation method of artificial Fluorite pellet |
-
2021
- 2021-02-05 CN CN202110162971.6A patent/CN112850768A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6256902B1 (en) * | 1998-11-03 | 2001-07-10 | John R. Flaherty | Apparatus and method for desiccating and deagglomerating wet, particulate materials |
| US6723139B1 (en) * | 1998-12-30 | 2004-04-20 | Atofina | Method for recycling fine calcium fluoride powder |
| CN201981106U (en) * | 2010-10-29 | 2011-09-21 | 华南理工大学 | Complete set of equipment for step-by-step sludge drying through hot tail gas of boiler |
| WO2013026263A1 (en) * | 2011-08-22 | 2013-02-28 | 广州普得环保设备有限公司 | Method for retreating dewatered sludge |
| TWM467518U (en) * | 2013-07-08 | 2013-12-11 | Siang Fong Sheng Corp | Equipment for fabricating fluorite balls using calcium fluoride sludge |
| CN104955343A (en) * | 2013-12-16 | 2015-09-30 | 纽特林西克公司 | Methods of processing waste activated sludge |
| CN106986368A (en) * | 2017-03-13 | 2017-07-28 | 李德寿 | A kind of preparation method of artificial Fluorite pellet |
Non-Patent Citations (1)
| Title |
|---|
| 李建华: "《环境科学与工程技术辞典 修订版 上》", 中国环境出版社, pages: 25 * |
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Application publication date: 20210528 |