CN113264536A - Method for treating mixture of sodium fluoride and sodium chloride - Google Patents
Method for treating mixture of sodium fluoride and sodium chloride Download PDFInfo
- Publication number
- CN113264536A CN113264536A CN202110510904.9A CN202110510904A CN113264536A CN 113264536 A CN113264536 A CN 113264536A CN 202110510904 A CN202110510904 A CN 202110510904A CN 113264536 A CN113264536 A CN 113264536A
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- sodium
- sodium chloride
- chloride
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- sodium fluoride
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B35/00—Boron; Compounds thereof
- C01B35/06—Boron halogen compounds
- C01B35/063—Tetrafluoboric acid; Salts thereof
- C01B35/066—Alkali metal tetrafluoborates
-
- 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
- C01D3/04—Chlorides
- C01D3/08—Preparation by working up natural or industrial salt mixtures or siliceous minerals
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- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
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- Materials Engineering (AREA)
- Investigating Or Analyzing Non-Biological Materials By The Use Of Chemical Means (AREA)
Abstract
The invention discloses a method for treating a mixture of sodium fluoride and sodium chloride, which comprises the steps of measuring the content proportion of sodium fluoride in the mixture of sodium fluoride and sodium chloride by a titration method, and adding water into the mixture of sodium fluoride and sodium chloride for stirring; during the stirring process, proportionally adding sodium tetraborate, potassium chloride and hydrogen chloride into a reaction kettle for full reaction; after the reaction in the reaction kettle is completed, obtaining a mixed solution of the gelatinous potassium fluoborate and the sodium chloride aqueous solution; standing the mixed solution, and extracting the sodium chloride aqueous solution after the gelatinous potassium fluoborate is settled and precipitated; discharging the sodium chloride aqueous solution into an evaporator for evaporation concentration, and discharging the concentrated solution into a crystallization kettle for crystallization after the concentration is finished; and after the crystallization is finished, the sodium chloride crystal is separated in a centrifuge, and then the sodium chloride crystal is dried by a fluidized bed and packed into a finished product.
Description
Technical Field
The invention belongs to the technical field of chemical industry, and particularly relates to a method for treating a mixture of sodium fluoride and sodium chloride.
Background
The aqueous solution of sodium fluoride is weakly alkaline, and is dissolved in hydrofluoric acid to form sodium fluoride which can corrode glass and is toxic. Can be used as a phosphating accelerant in the coating industry, stabilizes phosphating solution, refines phosphating and improves the performance of a phosphating film. Al3+ with great harm and negative catalysis is sealed in the phosphorization of aluminum and its alloy, so that the phosphorization can be smoothly carried out on wood preservative, agricultural pesticide, bactericide for brewing industry, medical preservative, welding flux, alkaline zincate galvanizing additive, enamel industry, paper making industry and the like. However, this substance is a great environmental hazard and is difficult to handle when sodium fluoride and sodium chloride are mixed.
Disclosure of Invention
The invention aims to provide a method for treating a mixture of sodium fluoride and sodium chloride, which can react sodium fluoride in the mixture of sodium fluoride and sodium chloride with sodium tetraborate, potassium chloride and hydrogen chloride to generate potassium fluoborate precipitate and recover sodium chloride.
In order to achieve the purpose, the invention adopts the technical scheme that: a method for processing a mixture of sodium fluoride and sodium chloride comprises the following steps:
step one, measuring the content proportion of sodium fluoride in a mixture of sodium fluoride and sodium chloride by a titration method, and adding water into the mixture of sodium fluoride and sodium chloride in a reaction kettle for stirring.
And step two, in the stirring process, putting the sodium tetraborate, the potassium chloride and the hydrogen chloride into a reaction kettle in proportion, and fully reacting.
And step three, obtaining a mixed solution of the gelatinous potassium fluoborate and the sodium chloride aqueous solution after the reaction in the reaction kettle is completed.
And step four, standing the mixed solution, and extracting the sodium chloride aqueous solution after the gelatinous potassium fluoborate is settled and precipitated.
And step five, discharging the sodium chloride aqueous solution into an evaporator for evaporation concentration, and discharging the concentrated solution into a crystallization kettle for crystallization after the concentration is finished.
And step six, after the crystallization is finished, the sodium chloride crystals are separated in a centrifuge, and then the sodium chloride crystals are dried by a fluidized bed and packaged into finished products.
Further, in the second step, hydrogen chloride is replaced by hydrofluoric acid.
Further, in the second step, the molar ratio of the sodium tetraborate to the potassium chloride to the hydrogen chloride is 16: 1: 14.
further, in the second step, hydrofluoric acid replaces hydrogen chloride, and the molar ratio of sodium tetraborate to potassium chloride to hydrofluoric acid is 2: 1: 14.
further, the pH value of the reaction process is from alkalinity to neutrality, and the pH value of the reaction end point is 7.
Compared with the prior art, the invention has the following beneficial effects: the method utilizes the reaction of the sodium tetraborate, the potassium chloride and the hydrogen chloride with the sodium fluoride in the mixture of the sodium fluoride and the sodium chloride, thereby obtaining the sodium chloride and the potassium fluoborate for recycling, fully recycling the waste, reducing the discharge and reducing the environmental pollution.
Detailed Description
Example 1:
step one, measuring the content ratio of sodium fluoride to sodium chloride by a titration method to 9.25%, putting 98KG mixture of sodium fluoride and sodium chloride into a reaction kettle, adding 621KG water, and stirring. 36.8
Step two, in the stirring process, according to the chemical formula
The molar ratio of sodium fluoride, sodium tetraborate, potassium chloride and hydrofluoric acid in 16NaF + Na2B4O7 & 5H2O +4KCl +14HCl → 4KBF4 ↓ +18NaCl +12H2O is 16: 1: 4: 14, putting 2.3KG sodium tetraborate, 4KG potassium chloride and 6.9KG hydrogen chloride into the reaction kettle, wherein the pH value is from alkalinity to neutrality in the reaction process, and the pH value at the end point of the reaction is 7.
And step three, obtaining a mixed solution of the gelatinous potassium fluoborate and the sodium chloride aqueous solution after the reaction in the reaction kettle is completed.
And step four, standing the mixed solution for 24 hours, and extracting the sodium chloride aqueous solution after the gelatinous potassium fluoborate is settled and precipitated.
And step five, discharging the sodium chloride aqueous solution into an evaporator for evaporation concentration, and discharging the concentrated solution into a crystallization kettle for crystallization after the concentration is finished.
And step six, after the crystallization is finished, the sodium chloride crystals are separated in a centrifuge, and then the sodium chloride crystals are dried by a fluidized bed and packaged into finished products.
Example 2:
step one, measuring the content ratio of sodium fluoride to sodium chloride by a titration method to 9.25%, putting 98KG mixture of sodium fluoride and sodium chloride into a reaction kettle, adding 621KG water, and stirring.
Step two, in the stirring process, according to the chemical formula
The molar ratio of sodium fluoride, sodium tetraborate, potassium chloride and hydrofluoric acid in 2NaF + Na2B4O7 & 5H2O +4KCl +14HF → 4KBF4 ↓ +4NaCl +12H2O is 2: 1: 4: 14, adding 18.3KG sodium tetraborate, 32.4KG potassium chloride and 30.2KG hydrofluoric acid into a reaction kettle, wherein the pH value is from alkalinity to neutrality in the reaction process, and the pH value at the end point of the reaction is 7.
And step three, obtaining a mixed solution of the gelatinous potassium fluoborate and the sodium chloride aqueous solution after the reaction in the reaction kettle is completed.
And step four, standing the mixed solution for 24 hours, and extracting the sodium chloride aqueous solution after the gelatinous potassium fluoborate is settled and precipitated.
And step five, discharging the sodium chloride aqueous solution into an evaporator for evaporation concentration, and discharging the concentrated solution into a crystallization kettle for crystallization after the concentration is finished.
And step six, after the crystallization is finished, the sodium chloride crystals are separated in a centrifuge, and then the sodium chloride crystals are dried by a fluidized bed and packaged into finished products.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. A method for treating a mixture of sodium fluoride and sodium chloride is characterized by comprising the following steps: the processing method comprises the following steps:
step one, measuring the content proportion of sodium fluoride from a mixture of sodium fluoride and sodium chloride by a titration method, measuring the content proportion of sodium fluoride from the mixture of sodium fluoride and sodium chloride by the titration method, and adding water into the mixture of sodium fluoride and sodium chloride for stirring;
step two, in the stirring process, putting sodium tetraborate, potassium chloride and hydrogen chloride into a reaction kettle according to a proportion, and fully reacting;
step three, obtaining a mixed solution of the gelatinous potassium fluoborate and the sodium chloride aqueous solution after the reaction in the reaction kettle is completed;
step four, standing the mixed solution, and extracting the sodium chloride aqueous solution after the gelatinous potassium fluoborate is settled and precipitated;
step five, discharging the sodium chloride aqueous solution into an evaporator for evaporation concentration, and discharging the concentrated solution into a crystallization kettle for crystallization after the concentration is finished;
and step six, after the crystallization is finished, the sodium chloride crystals are separated in a centrifuge, and then the sodium chloride crystals are dried by a fluidized bed and packaged into finished products.
2. The method of claim 1, wherein the treatment of the mixture of sodium fluoride and sodium chloride comprises: in the second step, the hydrogen chloride is replaced by hydrofluoric acid.
3. The method of claim 1, wherein the treatment of the mixture of sodium fluoride and sodium chloride comprises: in the second step, the molar ratio of sodium fluoride, sodium tetraborate, potassium chloride and hydrogen chloride is 16: 1: 4: 14.
4. the method for treating a mixture of sodium fluoride and sodium chloride as claimed in claim 2, wherein: in the second step, hydrofluoric acid replaces hydrogen chloride, and the molar ratio of sodium fluoride, sodium tetraborate, potassium chloride to hydrofluoric acid is 2: 1: 4: 14.
5. the method of claim 1, wherein the treatment of the mixture of sodium fluoride and sodium chloride comprises: the pH value of the reaction process is from alkalinity to neutrality, and the pH value of the reaction end point is 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110510904.9A CN113264536A (en) | 2021-05-11 | 2021-05-11 | Method for treating mixture of sodium fluoride and sodium chloride |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110510904.9A CN113264536A (en) | 2021-05-11 | 2021-05-11 | Method for treating mixture of sodium fluoride and sodium chloride |
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| Publication Number | Publication Date |
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| CN113264536A true CN113264536A (en) | 2021-08-17 |
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| CN202110510904.9A Pending CN113264536A (en) | 2021-05-11 | 2021-05-11 | Method for treating mixture of sodium fluoride and sodium chloride |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU730853A1 (en) * | 1977-12-30 | 1980-04-30 | Предприятие П/Я В-8402 | Flux for treatment of aluminium-silicon alloys |
| CN102730710A (en) * | 2012-07-06 | 2012-10-17 | 江苏华盛精化工股份有限公司 | Method for separating potassium chloride and potassium fluoride |
| CN102874756A (en) * | 2012-09-24 | 2013-01-16 | 巨化集团技术中心 | Method for removing hydrogen fluoride from hydrogen chloride gas |
| CN105731482A (en) * | 2016-01-15 | 2016-07-06 | 江苏新泰材料科技股份有限公司 | Method for preparing potassium fluoborate from fluorine-containing wastewater |
| CN111392732A (en) * | 2020-05-14 | 2020-07-10 | 江西渠成氟化学有限公司 | Treatment process of organic byproduct potassium fluoride and potassium chloride mixture |
| CN112408680A (en) * | 2019-11-29 | 2021-02-26 | 中冶长天国际工程有限责任公司 | Method for fine treatment of wastewater containing fluorine and chlorine |
-
2021
- 2021-05-11 CN CN202110510904.9A patent/CN113264536A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU730853A1 (en) * | 1977-12-30 | 1980-04-30 | Предприятие П/Я В-8402 | Flux for treatment of aluminium-silicon alloys |
| CN102730710A (en) * | 2012-07-06 | 2012-10-17 | 江苏华盛精化工股份有限公司 | Method for separating potassium chloride and potassium fluoride |
| CN102874756A (en) * | 2012-09-24 | 2013-01-16 | 巨化集团技术中心 | Method for removing hydrogen fluoride from hydrogen chloride gas |
| CN105731482A (en) * | 2016-01-15 | 2016-07-06 | 江苏新泰材料科技股份有限公司 | Method for preparing potassium fluoborate from fluorine-containing wastewater |
| CN112408680A (en) * | 2019-11-29 | 2021-02-26 | 中冶长天国际工程有限责任公司 | Method for fine treatment of wastewater containing fluorine and chlorine |
| CN111392732A (en) * | 2020-05-14 | 2020-07-10 | 江西渠成氟化学有限公司 | Treatment process of organic byproduct potassium fluoride and potassium chloride mixture |
Non-Patent Citations (2)
| Title |
|---|
| 杨水艳: "氟硅酸、硼酸制备氟硼酸钾工艺研究", 《无机盐工业》 * |
| 陈宏伟: "高品质氟硼酸钾制备研究", 《河南化工》 * |
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Application publication date: 20210817 |