CN112919518A - Method for recovering granular calcium fluoride product from calcium fluoride sludge resource - Google Patents
Method for recovering granular calcium fluoride product from calcium fluoride sludge resource Download PDFInfo
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- CN112919518A CN112919518A CN202110163966.7A CN202110163966A CN112919518A CN 112919518 A CN112919518 A CN 112919518A CN 202110163966 A CN202110163966 A CN 202110163966A CN 112919518 A CN112919518 A CN 112919518A
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- 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
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/30—Particle morphology extending in three dimensions
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- 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
Abstract
A method for recovering granular calcium fluoride products from calcium fluoride sludge resources, 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; (3) and (4) collecting and storing the granular calcium fluoride product. According to the invention, the wet calcium fluoride sludge is dried to form granular calcium fluoride, the effective content of the calcium fluoride can reach 65-85%, the calcium fluoride meets the use standard of fluorite lump ore, and the calcium fluoride can be used for replacing the fluorite lump ore.
Description
Technical Field
The invention relates to the technical field of calcium fluoride sludge treatment, in particular to a method for recovering granular calcium fluoride products from calcium fluoride sludge resources.
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 granular calcium fluoride products from calcium fluoride sludge resources.
The technical purpose of the invention is realized by the following technical scheme: a method for recovering granular calcium fluoride products from calcium fluoride sludge resources 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: 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) collection and storage of particulate calcium fluoride preparation: the granular calcium fluoride is settled by the self gravity and enters a dry sludge bin from the outlet at the bottom end of the dryer for storing the granular 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, and because the content of calcium fluoride in the calcium fluoride sludge produced by the photovoltaic enterprises is 80-95%, the effective content of calcium fluoride in the granular calcium fluoride formed after drying can reach 65-85%, the calcium fluoride meets the use standard of fluorite lump ore and can be used as a substitute for the fluorite lump ore.
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 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.
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 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 material.
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 (3), the granular calcium fluoride stored in the dry sludge bin is hermetically packaged by a packaging machine.
Through adopting above-mentioned technical scheme, graininess calcium fluoride in time carries out seal packing through packagine machine, avoids graininess calcium fluoride to wet.
By adopting the technical scheme, the invention has the beneficial effects that:
1. the wet calcium fluoride sludge is dried to form granular calcium fluoride, the effective content of the calcium fluoride can reach 65-85%, the calcium fluoride meets the use standard of fluorite lump ore, and the calcium fluoride can be used for replacing the fluorite lump ore.
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%.
Drawings
FIG. 1 is a process flow diagram of a method for recovering granular calcium fluoride products from calcium fluoride sludge resources 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 granular calcium fluoride products from calcium fluoride sludge resources 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: 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) collection and storage of particulate calcium fluoride preparation: the granular calcium fluoride is settled by the self gravity and enters a dry sludge bin from the outlet at the bottom end of the dryer for storing the granular calcium fluoride.
Further, in the step (1), before the wet calcium fluoride sludge is stored in the wet sludge bin, the wet calcium fluoride sludge is pretreated, and the pretreatment operation comprises a wastewater treatment process and excessive lime addition.
Further, the pretreatment operation also comprises filter pressing dehydration, so that the water content of the calcium fluoride wet sludge is 60%.
Further, in the step (3), a small part of granular calcium fluoride and high-temperature gas in the dryer are conveyed to the bag-type dust remover in a dust-containing waste gas mode through the top outlet of the dryer through the fan and the pipeline for treatment and then discharged at high altitude.
Further, the dust collected by the 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 material.
Further, a stirrer is arranged in the wet sludge bin.
Further, in the step (3), the granular calcium fluoride stored in the dry sludge bin is hermetically packaged by a packaging machine.
Example two:
a method for recovering granular calcium fluoride products from calcium fluoride sludge resources 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: 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) collection and storage of particulate calcium fluoride preparation: the granular calcium fluoride is settled by the self gravity and enters a dry sludge bin from the outlet at the bottom end of the dryer for storing the granular calcium fluoride.
Further, in the step (1), before the wet calcium fluoride sludge is stored in the wet sludge bin, the wet calcium fluoride sludge is pretreated, and the pretreatment operation comprises a wastewater treatment process and excessive lime addition.
Further, the pretreatment operation also comprises filter pressing dehydration, so that the water content of the calcium fluoride wet sludge is 60%.
Further, in the step (3), a small part of granular calcium fluoride and high-temperature gas in the dryer are conveyed to the bag-type dust remover in a dust-containing waste gas mode through the top outlet of the dryer through the fan and the pipeline for treatment and then discharged at high altitude.
Further, the dust collected by the 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 material.
Further, a stirrer is arranged in the wet sludge bin.
Further, in the step (3), the granular calcium fluoride stored in the dry sludge bin is hermetically packaged by a packaging machine.
Example three:
a method for recovering granular calcium fluoride products from calcium fluoride sludge resources 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: 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) collection and storage of particulate calcium fluoride preparation: the granular calcium fluoride is settled by the self gravity and enters a dry sludge bin from the outlet at the bottom end of the dryer for storing the granular calcium fluoride.
Further, in the step (1), before the wet calcium fluoride sludge is stored in the wet sludge bin, the wet calcium fluoride sludge is pretreated, and the pretreatment operation comprises a wastewater treatment process and excessive lime addition.
Further, the pretreatment operation also comprises filter pressing dehydration, so that the water content of the calcium fluoride wet sludge is 60%.
Further, in the step (3), a small part of granular calcium fluoride and high-temperature gas in the dryer are conveyed to the bag-type dust remover in a dust-containing waste gas mode through the top outlet of the dryer through the fan and the pipeline for treatment and then discharged at high altitude.
Further, the dust collected by the 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 material.
Further, a stirrer is arranged in the wet sludge bin.
Further, in the step (3), the granular calcium fluoride stored in the dry sludge bin is hermetically packaged by a packaging machine.
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
As is clear from table 1, the calcium fluoride content in the granular calcium fluoride formed in each of examples one, two and three was 65% or more. The method for recovering the granular calcium fluoride product from the calcium fluoride sludge resource can effectively utilize the calcium fluoride sludge to obtain granular calcium fluoride meeting the use standard of fluorite lump ore as a substitute for the fluorite lump ore.
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 (7)
1. A method for recovering granular calcium fluoride products from calcium fluoride sludge resources 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: 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) collection and storage of particulate calcium fluoride preparation: the granular calcium fluoride is settled by the self gravity and enters a dry sludge bin from the outlet at the bottom end of the dryer for storing the granular calcium fluoride.
2. The method for recovering the granular 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 granular 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 calcium fluoride wet sludge lower than 60%.
4. The method for recovering the granular calcium fluoride product from the calcium fluoride sludge resource as claimed in claim 1, wherein in the step (3), a small part of the granular calcium fluoride is conveyed to a bag-type dust remover through a top outlet of the dryer in the form of dust-containing waste gas through a fan and a pipeline for treatment and then is discharged at high altitude together with high-temperature gas in the dryer.
5. The method for recovering the granular calcium fluoride product from the calcium fluoride sludge resource as claimed in claim 4, wherein the dust collected by the 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 granular 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 granular calcium fluoride product from the calcium fluoride sludge resource as claimed in claim 1, wherein in the step (3), the granular calcium fluoride stored in the dry sludge bin is hermetically packaged by a packaging machine.
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| CN202110163966.7A CN112919518A (en) | 2021-02-05 | 2021-02-05 | Method for recovering granular calcium fluoride product from calcium fluoride sludge resource |
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|---|---|---|---|---|
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