GB1502422A - Process for making magnesium hydroxide - Google Patents
Process for making magnesium hydroxideInfo
- Publication number
- GB1502422A GB1502422A GB1033974A GB1033974A GB1502422A GB 1502422 A GB1502422 A GB 1502422A GB 1033974 A GB1033974 A GB 1033974A GB 1033974 A GB1033974 A GB 1033974A GB 1502422 A GB1502422 A GB 1502422A
- Authority
- GB
- United Kingdom
- Prior art keywords
- magnesium hydroxide
- sea water
- alkali
- slurry
- hydroxide
- 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
- C01F5/00—Compounds of magnesium
- C01F5/14—Magnesium hydroxide
- C01F5/22—Magnesium hydroxide from magnesium compounds with alkali hydroxides or alkaline- earth oxides or hydroxides
Landscapes
- 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)
- Removal Of Specific Substances (AREA)
Abstract
1502422 Magnesium hydroxide STEETLEY MINERALS Ltd 6 March 1975 [7 March 1974] 10339/74 Heading C1A Magnesium hydroxide is prepared by mixing sea water with alkali in the presence of seed crystals of magnesium hydroxide; the alkali is added in excess and the sea water is separated off from the precipitate to give a thickened slurry containing from 25 to 300 grams of magnesium hydroxide per litre of the slurry; this slurry is then treated with an amount of sea water containing sufficient magnesium ions to react with the excess alkali. Preferably the sea water is mixed with the alkali so that the magnesium hydroxide is precipitated at a pH greater than at equivalence. The seed crystals may be obtained from (i) the suspension of hydroxide formed on reacting the alkali with the sea water, (ii) from the hydroxide slurry obtained by separating off the sea water from the suspension or (iii) from the final magnesium hydroxide product. These seed crystals are preferably present in an amount of from 10 to 35 times the weight of the magnesium hydroxide precipitated. The magnesium hydroxide product may be subsequently treated to obtain caustic magnesia and dead burnt magnesia.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1033974A GB1502422A (en) | 1975-03-06 | 1975-03-06 | Process for making magnesium hydroxide |
IT6758075A IT1030290B (en) | 1975-03-06 | 1975-03-07 | Magnesium hydroxide prepn. from sea water - by reacting with excess alkali then reacting alkaline slurry with sea water |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1033974A GB1502422A (en) | 1975-03-06 | 1975-03-06 | Process for making magnesium hydroxide |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1502422A true GB1502422A (en) | 1978-03-01 |
Family
ID=9966046
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1033974A Expired GB1502422A (en) | 1975-03-06 | 1975-03-06 | Process for making magnesium hydroxide |
Country Status (2)
Country | Link |
---|---|
GB (1) | GB1502422A (en) |
IT (1) | IT1030290B (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4229423A (en) | 1979-02-09 | 1980-10-21 | Kaiser Aluminum & Chemical Corporation | Method of producing magnesium hydroxide |
WO2000029326A1 (en) * | 1998-11-13 | 2000-05-25 | Norsk Hydro Asa | Method for production of magnesium hydroxide from sea water |
-
1975
- 1975-03-06 GB GB1033974A patent/GB1502422A/en not_active Expired
- 1975-03-07 IT IT6758075A patent/IT1030290B/en active
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4229423A (en) | 1979-02-09 | 1980-10-21 | Kaiser Aluminum & Chemical Corporation | Method of producing magnesium hydroxide |
WO2000029326A1 (en) * | 1998-11-13 | 2000-05-25 | Norsk Hydro Asa | Method for production of magnesium hydroxide from sea water |
Also Published As
Publication number | Publication date |
---|---|
IT1030290B (en) | 1979-03-30 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PCNP | Patent ceased through non-payment of renewal fee |