CN104556181A - Method for preparing cryolite with aluminum fluoride used as aluminum source - Google Patents
Method for preparing cryolite with aluminum fluoride used as aluminum source Download PDFInfo
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- CN104556181A CN104556181A CN201410841260.1A CN201410841260A CN104556181A CN 104556181 A CN104556181 A CN 104556181A CN 201410841260 A CN201410841260 A CN 201410841260A CN 104556181 A CN104556181 A CN 104556181A
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- Prior art keywords
- aluminum fluoride
- aluminum
- sodium
- cryolite
- fluoride used
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Classifications
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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
- C01F7/00—Compounds of aluminium
- C01F7/48—Halides, with or without other cations besides aluminium
- C01F7/50—Fluorides
- C01F7/54—Double compounds containing both aluminium and alkali metals or alkaline-earth metals
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2002/00—Crystal-structural characteristics
- C01P2002/70—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data
- C01P2002/72—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data by d-values or two theta-values, e.g. as X-ray diagram
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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)
Abstract
The invention relates to a method for preparing cryolite with aluminum fluoride used as an aluminum source. Sodium carbonate powder and aluminum fluoride powder are fully mixed in the mole fraction of 1:1.33, a corundum saggar is used as a container, activated carbon is used as a separating agent, calcination is performed at the high temperature (300-1,000 DEG C) for 0.5-5 h, and the cryolite is prepared.
Description
Technical field
What the present invention relates to be a kind of is the method that sodium aluminum fluoride is prepared in aluminium source with aluminum fluoride, belongs to inorganic salt preparing technical field.
Background technology
Sodium aluminum fluoride is of many uses, is mainly widely used in the production of electrolytic aluminum.In the preparation method of sodium aluminum fluoride, more is liquid phase method, and reaction process complexity, complex operation, burning decrement are high and unstable, invest relatively large, or cost are higher.Chinese patent notification number CN1203000C, the day for announcing is on 05 25th, 2005, and disclosing a kind of ammonium aluminum fluoride that adopts during name is called " a kind of production method of sodium aluminum fluoride " is the solid phase method that sodium aluminum fluoride is prepared in aluminium source, mainly solves the deficiency that liquid phase method exists.But, this solid phase method Problems existing, first be reactant ammonium aluminum fluoride, and flux sodium carbonate, at high temperature all there is stronger reactive behavior, can react with the saggar holding batch mixing, according to siliceous or aluminium matter saggar, capital produces siliceous or containing the by product of aluminium on a small quantity, and is difficult to control; Secondly reactant ammonium aluminum fluoride molten, boiling point is low (is respectively 126.1 DEG C, 239.5 DEG C), easy decomposition (namely about 200 DEG C start to decompose, and about 260 DEG C are almost decomposed into aluminum fluoride, hydrofluoric acid and ammonia completely), solid state reaction is also difficult to control; In addition, the gas that ammonium aluminum fluoride and sodium carbonate pyroreaction produce is carbonic acid gas and the ammonia with comparatively high temps, can only low temperature, pressurizing absorption, or absorbs respectively, and can produce other by product again, working cost is higher.
Summary of the invention
The object of the present invention is achieved like this, and sodium carbonate and aluminum fluoride two kinds of powders are fully mixed by 1: 1.33 molar fraction, corundum sagger is container, and gac is separant, and high temperature (300 ~ 1000 DEG C) roasting prepares sodium aluminum fluoride in 0.5 ~ 5 hour.
The solid state reaction of present method foundation is:
4AlF
3+3Na
2CO
3＝2Na
3AlF
6+Al
2O
3+3CO
2
Reaction product contains the sodium aluminum fluoride of 80% and the aluminum oxide of 20%, can meet the needs of Aluminum Electrolysis Production completely.
Compared with prior art, aluminum fluoride of the present invention, have molten, boiling point is high (being respectively 1040 DEG C, 1537 DEG C), relatively stable, not labile feature, make high temperature solid state reaction be relatively easy to control; Solid state reaction itself produces quantitative aluminum oxide, and adopts corundum sagger, and gac is stuck with paste as separant, and the content of energy basic guarantee sodium aluminum fluoride and aluminum oxide is fixed, and extends again the work-ing life of saggar; React the carbonic acid gas produced to be easy to absorb, and the absorption product recyclable sodium carbonate again formed.Fig. 1 shows, compared with certain company's liquid phase method gained commercialization sodium aluminum fluoride product, except sodium aluminum fluoride and small amounts aluminium, and other impurity phases not obvious; Fig. 2 shows, compared with certain company's solid phase method gained commercialization sodium aluminum fluoride product, the degree of crystallization of product is higher.
Accompanying drawing explanation
Fig. 1. the XRD of certain company's liquid phase method gained commercialization sodium aluminum fluoride product and products obtained therefrom of the present invention contrasts.
Fig. 2. the XRD of certain company's solid phase method gained commercialization sodium aluminum fluoride product and products obtained therefrom of the present invention contrasts.
Specific embodiments
Embodiment 1
Calculate also weighing sodium carbonate and aluminum fluoride respectively by 1: 1.33 molar fraction and, in being equipped with in the ball mill grinding and be situated between, add ball-milling additive, ball milling 2 hours; Abundant mixed batch mixing is put into and brushed gac in advance and stick with paste and the corundum sagger dried, enter clock hood type furnace roasting, 500 DEG C of soaking times 3 hours, take out cooling.
Embodiment 2
Calculate also weighing sodium carbonate and aluminum fluoride respectively by 1: 1.33 molar fraction and, in being equipped with in the ball mill grinding and be situated between, add ball-milling additive, ball milling 2 hours; Abundant mixed batch mixing is put into and brushed gac in advance and stick with paste and the corundum sagger dried, enter continuous tunnel furnace roasting, 700 DEG C of soaking times 1 hour, take out cooling.
Claims (1)
1. one kind is the method that sodium aluminum fluoride is prepared in aluminium source with aluminum fluoride, sodium carbonate and aluminum fluoride two kinds of powders is it is characterized in that fully to mix by 1: 1.33 molar fraction, corundum sagger is container, and gac is separant, and high temperature (300 ~ 1000 DEG C) roasting prepares sodium aluminum fluoride in 0.5 ~ 5 hour.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410841260.1A CN104556181A (en) | 2014-12-30 | 2014-12-30 | Method for preparing cryolite with aluminum fluoride used as aluminum source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410841260.1A CN104556181A (en) | 2014-12-30 | 2014-12-30 | Method for preparing cryolite with aluminum fluoride used as aluminum source |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104556181A true CN104556181A (en) | 2015-04-29 |
Family
ID=53073386
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410841260.1A Pending CN104556181A (en) | 2014-12-30 | 2014-12-30 | Method for preparing cryolite with aluminum fluoride used as aluminum source |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104556181A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB643510A (en) * | 1944-02-05 | 1950-09-20 | Montedison Spa | Process for the preparation of artificial cryolite substantially free from silica |
| US3493331A (en) * | 1966-11-22 | 1970-02-03 | Reynolds Metals Co | Production of cryolite material |
| CN101982520A (en) * | 2010-09-17 | 2011-03-02 | 东北师范大学 | Rare earth phosphor red luminous material for converting purple light emitting diode (LED) to white light LED and preparation method thereof |
| CN102674421A (en) * | 2012-06-11 | 2012-09-19 | 江南大学 | Solid-phase synthesis method for high-molecular-ratio cryolite |
-
2014
- 2014-12-30 CN CN201410841260.1A patent/CN104556181A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB643510A (en) * | 1944-02-05 | 1950-09-20 | Montedison Spa | Process for the preparation of artificial cryolite substantially free from silica |
| US3493331A (en) * | 1966-11-22 | 1970-02-03 | Reynolds Metals Co | Production of cryolite material |
| CN101982520A (en) * | 2010-09-17 | 2011-03-02 | 东北师范大学 | Rare earth phosphor red luminous material for converting purple light emitting diode (LED) to white light LED and preparation method thereof |
| CN102674421A (en) * | 2012-06-11 | 2012-09-19 | 江南大学 | Solid-phase synthesis method for high-molecular-ratio cryolite |
Non-Patent Citations (1)
| Title |
|---|
| 陆祖勋: "高分子比冰晶石的合成和应用", 《轻金属》 * |
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Application publication date: 20150429 |