GB968879A - Improvements in or relating to processes for the treatment of industrial waste gases - Google Patents
Improvements in or relating to processes for the treatment of industrial waste gasesInfo
- Publication number
- GB968879A GB968879A GB1011861A GB1011861A GB968879A GB 968879 A GB968879 A GB 968879A GB 1011861 A GB1011861 A GB 1011861A GB 1011861 A GB1011861 A GB 1011861A GB 968879 A GB968879 A GB 968879A
- Authority
- GB
- United Kingdom
- Prior art keywords
- solution
- washing
- ferric
- compounds
- cryolite
- 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.)
- Expired
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/68—Halogens or halogen compounds
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Analytical Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Inorganic Chemistry (AREA)
- Biomedical Technology (AREA)
- Treating Waste Gases (AREA)
- Removal Of Specific Substances (AREA)
Abstract
Cryolite is obtained by washing industrial waste gases containing fluorine with an acidified aqueous solution, then adding to the resultant acid solution ferric ion in an amount at least sufficient to form FePO4 with any phosphorus present, then raising the pH of the solution, preferably by adding ammonia, so as successively to precipitate phosphorus compounds, excess ferric ion and silica, and adding to the remaining solution a soluble salt of aluminium and a sodium salt to cause the precipitation of cryolite. The process may be applied to the gas containing fluorinated compounds derived from the treatment of natural phosphates used in the production of phosphorus, phosphoric acid or superphosphates. The washing solution may be formed by introducing into the washing apparatus water or a mixture of water and part of the solution resulting from the washing. The washing solution, which preferably has a pH of less than 5, may contain in solution compounds used at a later stage of the process, e.g. sodium or ammonium ions or a portion, or all, of the ferric compound which is used to precipitate the phosphoric anions. The desired pH in the washing apparatus is obtained by regulating the respective flows of feed. The preferred ferric compounds are the chloride, fluoride, sulphate or alum; ferric fluoride may be obtained by reacting a portion of the solution from the gas washing with an iron oxide or hydroxide or metallic iron in the presence of air. The cryolite suspension finally obtained is filtered and a portion of the filtrate which contains the regenerated ammonia and possibly an ammonium salt corresponding to the anion of the utilized ferric compound, is withdrawn to keep the working volume constant, and the remaining filtrate is recycled principally towards the stage of neutralization of the ferric acid solution and partly, if desired, to the stage of washing the gases, mixed with a portion of the acid solution from the gas washing. A flow diagram is given.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR822376A FR1260171A (en) | 1960-03-25 | 1960-03-25 | Fluorinated gas treatment process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB968879A true GB968879A (en) | 1964-09-02 |
Family
ID=8727870
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1011861A Expired GB968879A (en) | 1960-03-25 | 1961-03-20 | Improvements in or relating to processes for the treatment of industrial waste gases |
Country Status (6)
| Country | Link |
|---|---|
| BE (1) | BE600509A (en) |
| CH (1) | CH401924A (en) |
| DE (1) | DE1190449B (en) |
| FR (1) | FR1260171A (en) |
| GB (1) | GB968879A (en) |
| NL (1) | NL262471A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109851132A (en) * | 2019-03-22 | 2019-06-07 | 盛隆资源再生（无锡）有限公司 | A method of recycling ice crystal, fluorite and ammonium sulfate from the high ammonia nitrogen acid waste water of high fluorine |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2750943A1 (en) * | 1977-11-15 | 1979-05-17 | Bayer Ag | METHOD FOR PURIFYING AMMONIUM FLUORIDE SOLUTIONS |
| CN112850680B (en) * | 2021-02-26 | 2022-11-22 | 桂林理工大学 | Method for preparing anhydrous iron phosphate by ferrate self-reduction reaction |
-
0
- NL NL262471D patent/NL262471A/xx unknown
-
1960
- 1960-03-25 FR FR822376A patent/FR1260171A/en not_active Expired
-
1961
- 1961-02-23 BE BE600509A patent/BE600509A/en unknown
- 1961-03-20 GB GB1011861A patent/GB968879A/en not_active Expired
- 1961-03-23 DE DES73122A patent/DE1190449B/en active Pending
- 1961-03-24 CH CH352261A patent/CH401924A/en unknown
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109851132A (en) * | 2019-03-22 | 2019-06-07 | 盛隆资源再生（无锡）有限公司 | A method of recycling ice crystal, fluorite and ammonium sulfate from the high ammonia nitrogen acid waste water of high fluorine |
Also Published As
| Publication number | Publication date |
|---|---|
| NL262471A (en) | |
| DE1190449B (en) | 1965-04-08 |
| FR1260171A (en) | 1961-05-05 |
| CH401924A (en) | 1965-11-15 |
| BE600509A (en) | 1961-06-16 |
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