CN112978764A - Decolorizing method of industrial-grade sodium fluoride - Google Patents
Decolorizing method of industrial-grade sodium fluoride Download PDFInfo
- Publication number
- CN112978764A CN112978764A CN202110463613.9A CN202110463613A CN112978764A CN 112978764 A CN112978764 A CN 112978764A CN 202110463613 A CN202110463613 A CN 202110463613A CN 112978764 A CN112978764 A CN 112978764A
- Authority
- CN
- China
- Prior art keywords
- sodium fluoride
- industrial
- hydrogen peroxide
- stirring
- grade sodium
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- PUZPDOWCWNUUKD-UHFFFAOYSA-M sodium fluoride Chemical compound [F-].[Na+] PUZPDOWCWNUUKD-UHFFFAOYSA-M 0.000 title claims abstract description 75
- 235000013024 sodium fluoride Nutrition 0.000 title claims abstract description 37
- 239000011775 sodium fluoride Substances 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 title claims abstract description 10
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims abstract description 27
- 238000003756 stirring Methods 0.000 claims abstract description 16
- 239000007787 solid Substances 0.000 claims abstract description 9
- 239000007788 liquid Substances 0.000 claims abstract description 7
- 238000000926 separation method Methods 0.000 claims abstract description 7
- 238000004140 cleaning Methods 0.000 claims description 2
- 238000001035 drying Methods 0.000 claims description 2
- 238000001914 filtration Methods 0.000 claims description 2
- 238000010907 mechanical stirring Methods 0.000 claims description 2
- 238000001694 spray drying Methods 0.000 claims description 2
- 239000013078 crystal Substances 0.000 abstract description 6
- 238000010438 heat treatment Methods 0.000 abstract description 5
- 230000000052 comparative effect Effects 0.000 description 5
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- DDFHBQSCUXNBSA-UHFFFAOYSA-N 5-(5-carboxythiophen-2-yl)thiophene-2-carboxylic acid Chemical compound S1C(C(=O)O)=CC=C1C1=CC=C(C(O)=O)S1 DDFHBQSCUXNBSA-UHFFFAOYSA-N 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 238000003889 chemical engineering Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000012847 fine chemical Substances 0.000 description 1
- 150000004673 fluoride salts Chemical class 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000002917 insecticide Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000003755 preservative agent Substances 0.000 description 1
- 230000002335 preservative effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000003566 sealing material Substances 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D3/00—Halides of sodium, potassium or alkali metals in general
- C01D3/02—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
- C01P2006/60—Optical properties, e.g. expressed in CIELAB-values
- C01P2006/65—Chroma (C*)
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Inorganic Chemistry (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
The invention discloses a decoloring method of industrial-grade sodium fluoride. Adding white sodium fluoride into a hydrogen peroxide solution (optimally 3-5%) with the concentration of not more than 5%, mechanically stirring for about 6-8 hours, then carrying out solid-liquid separation, wherein the stirring speed is 200-1000 revolutions, heating the obtained solid sodium fluoride to 200-300 ℃, baking and dehydrating to obtain white sodium fluoride crystals.
Description
Technical Field
The invention relates to a method for decoloring industrial-grade sodium fluoride, belonging to the field of fine chemicals in chemical engineering.
Background
Sodium fluoride is an inorganic substance, has a chemical formula of NaF, is a colorless and bright crystal or a white powdery compound, has the specific gravity of 2.25, the melting point of 993 ℃ and the boiling point of 1695 ℃, is dissolved in water (the solubility is 10 ℃, 3.66, 20 ℃, 4.06, 30 ℃, 4.22, 40 ℃, 4.4, 60 ℃, 4.68, 80 ℃, 4.89 and 100 ℃ and 5.08), is slightly soluble in alcohol, is slightly alkaline in aqueous solution, is dissolved in hydrofluoric acid to form sodium fluoride, can corrode glass, is toxic, and is widely applied to various fields of a phosphating accelerator, an agricultural insecticide, a sealing material, a preservative and the like in the coating industry.
Sodium fluoride (NAF) is an important fluoride salt, making other fluoride sources. The sodium fluoride is used as a raw material to participate in chemical reaction, and the excessive sodium fluoride generally contains more organic matters, so that the content of the organic matters in the ammonium fluoride needs to be reduced.
Disclosure of Invention
The invention aims to solve the technical problem of impure color caused by high content of organic matters in the sodium fluoride at present.
In order to solve the technical problems, the invention adopts the following technical scheme:
a decoloring method of industrial-grade sodium fluoride comprises the following steps:
cleaning: adding colored sodium fluoride into a hydrogen peroxide solution with the concentration of not more than 5 percent;
secondly, stirring: stirring for 6-8 hours by adopting mechanical stirring at the rotating speed of 200-1000 rpm;
thirdly, solid-liquid separation: filtering by adopting a plate filter, wherein the solid is sodium fluoride solid;
drying: and (3) carrying out spray drying at 200-300 ℃ to obtain anhydrous sodium fluoride with the mass content of more than or equal to 98.5%.
The hydrogen peroxide concentration is 3%.
The hydrogen peroxide concentration is 4%.
The hydrogen peroxide concentration is 5%.
The temperature was 250 ℃.
The rotating speed is 200 revolutions, and the stirring is carried out for 6 hours.
The rotating speed is 1000 revolutions, and the stirring is carried out for 8 hours.
The temperature is 200 ℃.
The temperature is 300 ℃.
Detailed Description
Example 1:
adding colored 1kg of sodium fluoride into 500 ml of hydrogen peroxide solution (with the content of 3 wt%), mechanically stirring for about 6, performing solid-liquid separation, stirring at the speed of 200 rpm, heating the obtained solid sodium fluoride to 200 ℃, baking and dehydrating to finally obtain pure white sodium fluoride crystals.
Example 2:
adding colored 1kg of sodium fluoride into 500 ml of hydrogen peroxide solution (content is 4 wt%), mechanically stirring for about 8h, performing solid-liquid separation, stirring at the speed of 1000 rpm, heating the obtained solid sodium fluoride to 300 ℃, baking and dehydrating to finally obtain pure white sodium fluoride crystals.
Example 3:
adding colored 1kg of sodium fluoride into 500 ml of hydrogen peroxide solution (with the content of 5 wt%), mechanically stirring for about 8 hours, then carrying out solid-liquid separation, stirring at the speed of 1000 rpm, heating the obtained solid sodium fluoride to 300 ℃, baking and dehydrating, and finally obtaining pure white sodium fluoride crystals.
Comparative example 1:
adding colored 1kg of sodium fluoride into 500 ml of hydrogen peroxide solution (with the content of 1 wt%), mechanically stirring for about 8h, performing solid-liquid separation, stirring at the speed of 1000 rpm, heating the obtained solid sodium fluoride to 300 ℃, baking and dehydrating, and finally obtaining sodium fluoride crystals with impurity color.
The embodiment is superior to the comparative example, the comparative example is superior in each content, and the scheme is worthy of popularization.
Each example was compared with the comparative example as follows;
example 1: hydrogen peroxide wt%: 3, chroma: pure white;
example 2: hydrogen peroxide wt%: 4, chroma: pure white;
example 3: hydrogen peroxide wt%: 5, chroma: pure white;
comparative example 1: hydrogen peroxide wt%: 1, chroma: and grey.
Claims (5)
1. A decoloring method of industrial-grade sodium fluoride is characterized by comprising the following steps:
cleaning: adding colored sodium fluoride into a hydrogen peroxide solution with the concentration of not more than 5 percent;
secondly, stirring: stirring for 6-8 hours by adopting mechanical stirring at the rotating speed of 200-1000 rpm;
thirdly, solid-liquid separation: filtering by adopting a plate filter, wherein the solid is sodium fluoride solid;
drying: and (3) carrying out spray drying at 200-300 ℃ to obtain anhydrous sodium fluoride with the mass content of more than or equal to 98.5%.
2. The method for decoloring industrial-grade sodium fluoride according to claim 1, wherein: the hydrogen peroxide concentration was 3%.
3. The method for decoloring industrial-grade sodium fluoride according to claim 1, wherein: the hydrogen peroxide concentration was 4%.
4. The method for decoloring industrial-grade sodium fluoride according to claim 1, wherein: the hydrogen peroxide concentration was 5%.
5. The method for decoloring industrial-grade sodium fluoride according to claim 1, wherein: the temperature was 250 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110463613.9A CN112978764A (en) | 2021-04-28 | 2021-04-28 | Decolorizing method of industrial-grade sodium fluoride |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110463613.9A CN112978764A (en) | 2021-04-28 | 2021-04-28 | Decolorizing method of industrial-grade sodium fluoride |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112978764A true CN112978764A (en) | 2021-06-18 |
Family
ID=76340482
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110463613.9A Pending CN112978764A (en) | 2021-04-28 | 2021-04-28 | Decolorizing method of industrial-grade sodium fluoride |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112978764A (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102020292A (en) * | 2010-10-25 | 2011-04-20 | 宁波诺尔丽化学科技有限公司 | Method for preparing sodium fluoride from organic fluoridation waste material |
-
2021
- 2021-04-28 CN CN202110463613.9A patent/CN112978764A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102020292A (en) * | 2010-10-25 | 2011-04-20 | 宁波诺尔丽化学科技有限公司 | Method for preparing sodium fluoride from organic fluoridation waste material |
Non-Patent Citations (1)
| Title |
|---|
| 李继良主编: "《动手动脑学化学》", 31 December 2017, 首都师范大学出版社 * |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210618 |
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| RJ01 | Rejection of invention patent application after publication |