GB1039985A - Improvements in or relating to bayer process - Google Patents
Improvements in or relating to bayer processInfo
- Publication number
- GB1039985A GB1039985A GB6310/64A GB631064A GB1039985A GB 1039985 A GB1039985 A GB 1039985A GB 6310/64 A GB6310/64 A GB 6310/64A GB 631064 A GB631064 A GB 631064A GB 1039985 A GB1039985 A GB 1039985A
- Authority
- GB
- United Kingdom
- Prior art keywords
- oxalate
- liquor
- seed
- precipitated
- washed
- 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
-
- 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
- C01F7/02—Aluminium oxide; Aluminium hydroxide; Aluminates
- C01F7/04—Preparation of alkali metal aluminates; Aluminium oxide or hydroxide therefrom
- C01F7/14—Aluminium oxide or hydroxide from alkali metal aluminates
- C01F7/144—Aluminium oxide or hydroxide from alkali metal aluminates from aqueous aluminate solutions by precipitation due to cooling, e.g. as part of the Bayer process
-
- 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
- C01F7/02—Aluminium oxide; Aluminium hydroxide; Aluminates
- C01F7/04—Preparation of alkali metal aluminates; Aluminium oxide or hydroxide therefrom
- C01F7/14—Aluminium oxide or hydroxide from alkali metal aluminates
- C01F7/144—Aluminium oxide or hydroxide from alkali metal aluminates from aqueous aluminate solutions by precipitation due to cooling, e.g. as part of the Bayer process
- C01F7/148—Separation of the obtained hydroxide, e.g. by filtration or dewatering
-
- 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
- C01F7/02—Aluminium oxide; Aluminium hydroxide; Aluminates
- C01F7/46—Purification of aluminium oxide, aluminium hydroxide or aluminates
- C01F7/47—Purification of aluminium oxide, aluminium hydroxide or aluminates of aluminates, e.g. removal of compounds of Si, Fe, Ga or of organic compounds from Bayer process liquors
- C01F7/473—Removal of organic compounds, e.g. sodium oxalate
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/51—Particles with a specific particle size distribution
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/60—Particles characterised by their size
- C01P2004/61—Micrometer sized, i.e. from 1-100 micrometer
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Inorganic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
Alumina hydrate is precipitated from a pregnant caustic aluminate liquor containing oxalate (degraded organic material), which oxalate also precipitates and contaminates the alumina hydrate, and precipitated solids are separated from the major portion of the mother liquor for recycle as seed to the aforesaid precipitation, the seed being washed with water to dissolve the oxalate and the washed seed being separated from the oxalate-containing liquor and thereafter recycled to the precipitation process. In Fig. 1, the contaminated alumina hydrate is fed to coarse particle-thickening system 10, from which the coarse particles are passed to washing apparatus 24 before calcination. The finer particles, separated by elutriation, are passed along with the major portion of the spent liquor to fine particle-thickening system 30, from which the overflow spent liquor is recycled to the digestion step and the underflow portion, containing the fine hydrate and solid oxalate, is passed to washing system 40 where it is washed with water at less than 32 DEG C. to remove caustic liquor and with water at 50 DEG to 90 DEG C. to dissolve the oxalate. System 30 may comprise secondary and tertiary thickeners illustrated in Fig. 2 (not shown), in which case alumina seed of different sizes is obtained and washed by processes illustrated in Figs. 4 and 3 respectively (not shown). The seed is recycled and the oxalate liquor discarded or sent to system 50 wherein the oxalate is precipitated, e.g. by the addition of lime and the caustic solution produced is recycled to the digestion step, the calcium oxalate precipitate being rectified or calcined to regenerate time. In other embodiments sodium oxalate is precipitated with strong caustic and converted to Na2CO3 or lead or barium oxalates are precipitated using the appropriate hydroxide. <PICT:1039985/C1/1>
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US25982663A | 1963-02-20 | 1963-02-20 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1039985A true GB1039985A (en) | 1966-08-24 |
Family
ID=22986556
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB6310/64A Expired GB1039985A (en) | 1963-02-20 | 1964-02-14 | Improvements in or relating to bayer process |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JPS4811480B1 (en) |
| GB (1) | GB1039985A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4101629A (en) * | 1975-10-21 | 1978-07-18 | Aluminium Pechiney | Purification of solutions circulating in the bayer cycle |
| FR2468552A1 (en) * | 1979-10-30 | 1981-05-08 | Magyar Aluminium | PROCESS FOR REDUCING THE CONCENTRATION OF ORGANIC SUBSTANCES IN THE ALUMINA PRODUCTION CYCLE USING THE BAYER PROCESS |
| EP0345654A2 (en) * | 1988-06-03 | 1989-12-13 | Vereinigte Aluminium-Werke Aktiengesellschaft | Process for the removal of sodium oxalate from alkaline aluminate liquors |
| CN115369242A (en) * | 2022-09-06 | 2022-11-22 | 李星岚 | Precipitation process in process of leaching ion adsorption type rare earth |
-
1964
- 1964-02-14 GB GB6310/64A patent/GB1039985A/en not_active Expired
- 1964-02-20 JP JP39008837A patent/JPS4811480B1/ja active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4101629A (en) * | 1975-10-21 | 1978-07-18 | Aluminium Pechiney | Purification of solutions circulating in the bayer cycle |
| FR2468552A1 (en) * | 1979-10-30 | 1981-05-08 | Magyar Aluminium | PROCESS FOR REDUCING THE CONCENTRATION OF ORGANIC SUBSTANCES IN THE ALUMINA PRODUCTION CYCLE USING THE BAYER PROCESS |
| EP0345654A2 (en) * | 1988-06-03 | 1989-12-13 | Vereinigte Aluminium-Werke Aktiengesellschaft | Process for the removal of sodium oxalate from alkaline aluminate liquors |
| EP0345654A3 (en) * | 1988-06-03 | 1990-06-06 | Vereinigte Aluminium-Werke Aktiengesellschaft | Process for the removal of sodium oxalate from alkaline aluminate liquors |
| CN115369242A (en) * | 2022-09-06 | 2022-11-22 | 李星岚 | Precipitation process in process of leaching ion adsorption type rare earth |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS4811480B1 (en) | 1973-04-13 |
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