RU1775361C - Method for extracting fluorine in the form of sodium fluoride from silicon-containing solutions - Google Patents
Method for extracting fluorine in the form of sodium fluoride from silicon-containing solutionsInfo
- Publication number
- RU1775361C RU1775361C SU904819276A SU4819276A RU1775361C RU 1775361 C RU1775361 C RU 1775361C SU 904819276 A SU904819276 A SU 904819276A SU 4819276 A SU4819276 A SU 4819276A RU 1775361 C RU1775361 C RU 1775361C
- Authority
- RU
- Russia
- Prior art keywords
- silicon
- naf
- sodium fluoride
- containing solutions
- extracting fluorine
- Prior art date
Links
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
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Inorganic Chemistry (AREA)
- Silicon Compounds (AREA)
Description
Изобретение относитс к технологии неорганических соединений, преимущественно к технологии извлечени фтора в виде фторида натри из растворов, содержащих фтор и кремний, например, кремнефтористоводородной кислоты.The invention relates to the technology of inorganic compounds, mainly to the technology of extracting fluorine in the form of sodium fluoride from solutions containing fluorine and silicon, for example hydrofluoric acid.
Известен способ получени NaF и SI02 из растворов, получаемых при распульповке соли Na2SlF6 в воде, содержащих фтор и кремний. В этом способе к водной суспензии прибавл ют концентрированный раствор NH40H в количестве 4-8 молей на 1 моль Na2SIFG. При интенсивном перемешивании добавл ют концентрированную NaOH или натриевую соль с целый образовани раствора, содержащего NaF и осадок 5102.A method is known for producing NaF and SI02 from solutions obtained by reconstituting a Na2SlF6 salt in water containing fluorine and silicon. In this method, a concentrated solution of NH40H is added to the aqueous suspension in an amount of 4-8 moles per 1 mol of Na2SIFG. With vigorous stirring, concentrated NaOH or sodium salt was added to form a solution containing NaF and precipitate 5102.
Маточный раствор фторида аммони и натри концентрируют и выдел ют кристаллизацией NaF, который перекристаллизовывают с целью очистки NaF от примесей.The mother liquor of ammonium and sodium fluoride is concentrated and isolated by crystallization of NaF, which is recrystallized to purify NaF from impurities.
Этим способом получают осадок NaF, содержащий примесь 0,2% Si02., и SI02, содержащий примесь 0,5% NaF.In this way, a NaF precipitate containing an impurity of 0.2% Si02. And SI02 containing an impurity of 0.5% NaF are obtained.
Недостатками данного способа вл ютс его многостадийность, наличие периодических стадий получени NaF, невозможность организации непрерывного процесса, необходимость концентрировани раствора с целью получени пересыщенных растворов NaF и пыкристаллизовывани NaF дл дальнейшей его перекристаллизации с целью очистки NaF. Кроме того с осадком SI02 происходит значительные (до 0.5%) потери NaF.The disadvantages of this method are its multistage nature, the presence of periodic stages of NaF production, the inability to organize a continuous process, the need to concentrate the solution to obtain supersaturated NaF solutions and to crystallize NaF to further recrystallize it to purify NaF. In addition, a significant (up to 0.5%) NaF loss occurs with SI02 sediment.
Целью изобретени вл етс упрощение процесса.The aim of the invention is to simplify the process.
Пример. Дл определени оптимальной величины рН, при которой происходит наиболее полное выделение кремни , был использован раствор кремнефтористоводородной кислоты с концентрацией 140 г/л, полученный при водной абсорбции изExample. To determine the optimal pH at which the most complete separation of silicon occurs, a solution of hydrofluoric acid with a concentration of 140 g / l, obtained by aqueous absorption from
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SU904819276A RU1775361C (en) | 1990-02-16 | 1990-02-16 | Method for extracting fluorine in the form of sodium fluoride from silicon-containing solutions |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SU904819276A RU1775361C (en) | 1990-02-16 | 1990-02-16 | Method for extracting fluorine in the form of sodium fluoride from silicon-containing solutions |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| RU1775361C true RU1775361C (en) | 1992-11-15 |
Family
ID=21510996
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| SU904819276A RU1775361C (en) | 1990-02-16 | 1990-02-16 | Method for extracting fluorine in the form of sodium fluoride from silicon-containing solutions |
Country Status (1)
| Country | Link |
|---|---|
| RU (1) | RU1775361C (en) |
-
1990
- 1990-02-16 RU SU904819276A patent/RU1775361C/en active
Non-Patent Citations (1)
| Title |
|---|
| РЖ "Хими " Реферат Мг 17 Л 55 П. 1976. * |
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