CN104556179A - Method for producing cryolite from fluorine-containing waste gas - Google Patents
Method for producing cryolite from fluorine-containing waste gas Download PDFInfo
- Publication number
- CN104556179A CN104556179A CN201410744646.0A CN201410744646A CN104556179A CN 104556179 A CN104556179 A CN 104556179A CN 201410744646 A CN201410744646 A CN 201410744646A CN 104556179 A CN104556179 A CN 104556179A
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- CN
- China
- Prior art keywords
- fluorine
- waste gas
- aluminum fluoride
- fluoride
- sodium aluminum
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- 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.)
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B33/00—Silicon; Compounds thereof
- C01B33/113—Silicon oxides; Hydrates thereof
- C01B33/12—Silica; Hydrates thereof, e.g. lepidoic silicic acid
- C01B33/14—Colloidal silica, e.g. dispersions, gels, sols
-
- 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
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Dispersion Chemistry (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
The invention relates to a method for producing cryolite from fluorine-containing waste gas, which can be used for recovering fluorine-containing waste gas to prepare sodium fluosilicate. The method comprises the following steps: preparing a fluorine-containing solution from a right amount of water; adding ammonia water to precipitate silica gel; adding solid aluminum sulfate and a sodium chloride solution, and continuing stirring for 1 hour; adding ammonia water to regulate the pH value to 4; precipitating out cryolite; and repeatedly rinsing with clear water until the pH value is 7, carrying out centrifugal separation in a centrifuge to obtain the cryolite, and drying. The cryolite, which is prepared from the fluorine-containing waste gas by chemical reaction, has the advantages of good quality and low production cost; and the method can effectively protect the environment.
Description
Technical field
The invention of this reality relates to a kind of production method of sodium aluminum fluoride, especially a kind of method utilizing waste gas containing fluoride to produce sodium aluminum fluoride.
Background technology
Sodium aluminum fluoride is mainly used as the solubility promoter of aluminium metallurgy, also can be used as the sterilant of farm crop, enamel opacifier, the opalizer of glass and enamel production and solubility promoter, the wear-resistant filler of resin rubber.The production of iron alloy and rimming steel can also be same as.Sodium aluminum fluoride has a small amount of natural deposit, at present, sodium aluminum fluoride industrialized production method mainly contains soda ash fluorine chloric acid method, clay bittern method, silicofluoric acid production sodium aluminum fluoride co-producing white carbon black method etc., these methods all need to take certain fluorine resource, production cost is relatively high, and current technology all exists the different environmental pollution of degree.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of method utilizing fluorine waste gas to produce sodium aluminum fluoride, to improve the quality of products, reduces production cost, reduces the pollution to environment simultaneously.
Technical scheme of the present invention is: a kind of method utilizing waste gas containing fluoride to produce sodium aluminum fluoride, comprises the following steps:
1) waste gas containing fluoride reclaims obtained Sodium Silicofluoride;
2) suitable quantity of water is mixed with fluorine-containing solution;
3), under violent stirring, slowly add ammoniacal liquor to pH value 8.5 ~ 9, separate out silica gel completely;
4) filtering silica gel, filtrate adds dilute sulphuric acid, adjustment pH to 5.5;
5) heat more than 90 DEG C, under constantly stirring, slowly add Solid aluminum sulfate, react 0.5 hour;
6) add the sodium chloride solution of purification, continue stirring 1 hour;
7) will add ammoniacal liquor adjust ph is 3 ~ 4;
8) Precipitation sodium aluminum fluoride;
9) with clear water repeatedly rinsing be 6 ~ 7 to pH value, centrifugation sodium aluminum fluoride in whizzer;
10) dry, obtained sodium aluminum fluoride.
Beneficial effect of the present invention: method described in the present invention adopts fluorine waste gas to be that raw material carries out that the sodium aluminum fluoride quality that chemical reaction obtains is good, production cost is low, simultaneously can effective protection of the environment.
Embodiment
Embodiment one
1. waste gas containing fluoride reclaims obtained Sodium Silicofluoride;
2. suitable quantity of water is mixed with fluorine-containing solution;
3., under violent stirring, slowly add ammoniacal liquor to pH value 8.5, separate out silica gel completely;
4. filtering silica gel, filtrate adds dilute sulphuric acid, adjustment pH to 5.5;
5. be heated to 90 DEG C, under constantly stirring, slowly add Solid aluminum sulfate, react 0.5 hour;
6. add the sodium chloride solution of purification, continue stirring 1 hour;
7. will add ammoniacal liquor adjust ph is 3;
8. Precipitation sodium aluminum fluoride;
9. with clear water repeatedly rinsing be 6 to pH value, centrifugation sodium aluminum fluoride in whizzer;
10. dry, obtained sodium aluminum fluoride.
Embodiment two
A. waste gas containing fluoride reclaims obtained Sodium Silicofluoride;
B. suitable quantity of water is mixed with fluorine-containing solution;
C., under violent stirring, slowly add ammoniacal liquor to pH value 8.8, separate out silica gel completely;
D. filtering silica gel, filtrate adds dilute sulphuric acid, adjustment pH to 5.5;
E. heat more than 90 DEG C, under constantly stirring, slowly add Solid aluminum sulfate, react 0.5 hour;
F. add the sodium chloride solution of purification, continue stirring 1 hour;
G. will add ammoniacal liquor adjust ph is 3.5;
H. Precipitation sodium aluminum fluoride;
I. with clear water repeatedly rinsing be 6.5 to pH value, centrifugation sodium aluminum fluoride in whizzer;
J. dry, obtained sodium aluminum fluoride.
Embodiment three
1. waste gas containing fluoride reclaims obtained Sodium Silicofluoride;
2. suitable quantity of water is mixed with fluorine-containing solution;
3., under violent stirring, slowly adding ammoniacal liquor to pH value is 9, separates out silica gel completely;
4. filtering silica gel, filtrate adds dilute sulphuric acid, adjustment pH to 5.5;
5. heat more than 90 DEG C, under constantly stirring, slowly add Solid aluminum sulfate, react 0.5 hour;
6. add the sodium chloride solution of purification, continue stirring 1 hour;
7. will add ammoniacal liquor adjust ph is 4;
8. Precipitation sodium aluminum fluoride;
9. with clear water repeatedly rinsing be 7 to pH value, centrifugation sodium aluminum fluoride in whizzer;
Drying, obtained sodium aluminum fluoride.
Claims (1)
1. utilize waste gas containing fluoride to produce a method for sodium aluminum fluoride, comprise the following steps:
1) waste gas containing fluoride reclaims obtained Sodium Silicofluoride;
2) suitable quantity of water is mixed with fluorine-containing solution;
3), under violent stirring, slowly add ammoniacal liquor to pH value 8.5 ~ 9, separate out silica gel completely;
4) filtering silica gel, filtrate adds dilute sulphuric acid, adjustment pH to 5.5;
5) heat more than 90 DEG C, under constantly stirring, slowly add Solid aluminum sulfate, react 0.5 hour;
6) add the sodium chloride solution of purification, continue stirring 1 hour;
7) will add ammoniacal liquor adjust ph is 3 ~ 4;
8) Precipitation sodium aluminum fluoride;
9) with clear water repeatedly rinsing be 6 ~ 7 to pH value, centrifugation sodium aluminum fluoride in whizzer;
10) dry, obtained sodium aluminum fluoride.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410744646.0A CN104556179A (en) | 2014-12-09 | 2014-12-09 | Method for producing cryolite from fluorine-containing waste gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410744646.0A CN104556179A (en) | 2014-12-09 | 2014-12-09 | Method for producing cryolite from fluorine-containing waste gas |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104556179A true CN104556179A (en) | 2015-04-29 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410744646.0A Pending CN104556179A (en) | 2014-12-09 | 2014-12-09 | Method for producing cryolite from fluorine-containing waste gas |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104556179A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106587073A (en) * | 2016-12-26 | 2017-04-26 | 杨海 | Fluosilicic acid comprehensive recycling technology |
| CN107697939A (en) * | 2017-11-23 | 2018-02-16 | 达州励志环保科技有限公司 | A kind of method that ice crystal is produced using waste gas containing fluoride |
| CN107840358A (en) * | 2017-12-11 | 2018-03-27 | 达州励志环保科技有限公司 | A kind of method that ice crystal is produced using waste gas containing fluoride |
| CN111020221A (en) * | 2019-12-11 | 2020-04-17 | 深圳雅居乐环保科技有限公司 | Method for preparing aluminum smelting composite fluxing agent by using aluminum alkaline residues |
-
2014
- 2014-12-09 CN CN201410744646.0A patent/CN104556179A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106587073A (en) * | 2016-12-26 | 2017-04-26 | 杨海 | Fluosilicic acid comprehensive recycling technology |
| CN107697939A (en) * | 2017-11-23 | 2018-02-16 | 达州励志环保科技有限公司 | A kind of method that ice crystal is produced using waste gas containing fluoride |
| CN107840358A (en) * | 2017-12-11 | 2018-03-27 | 达州励志环保科技有限公司 | A kind of method that ice crystal is produced using waste gas containing fluoride |
| CN111020221A (en) * | 2019-12-11 | 2020-04-17 | 深圳雅居乐环保科技有限公司 | Method for preparing aluminum smelting composite fluxing agent by using aluminum alkaline residues |
| CN111020221B (en) * | 2019-12-11 | 2022-04-05 | 广州雅居乐固体废物处理有限公司 | Method for preparing aluminum smelting composite fluxing agent by using aluminum alkaline residues |
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Legal Events
| Date | Code | Title | Description |
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| C06 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20150429 |