GB917395A - Improvements in or relating to the conversion of dolomite into magnesium hydroxide - Google Patents
Improvements in or relating to the conversion of dolomite into magnesium hydroxideInfo
- Publication number
- GB917395A GB917395A GB1631859A GB1631859A GB917395A GB 917395 A GB917395 A GB 917395A GB 1631859 A GB1631859 A GB 1631859A GB 1631859 A GB1631859 A GB 1631859A GB 917395 A GB917395 A GB 917395A
- Authority
- GB
- United Kingdom
- Prior art keywords
- mgcl2
- dolomite
- brine
- washed
- slaked
- 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
Abstract
Slaked, calcined dolomite is converted into magnesium hydroxide by mixing the dolomite with an aqueous brine containing from 0,15 to 1,0 gram molecule per litre of MgCl2 to cause flocculation of Mg(OH)2 and to convert the Ca(OH)2 of the dolomite into CaCl2, and maintaining a concentration of MgCl2 in the brine of at least 0,005 gram molecule per litre during the conversion. The precipitate is washed with water having a MgCl2 concentration of at least 0,005 gram molecule per litre, or containing a flocculant, e.g. starch. In Examples 1 and 2 slaked calcined dolomite is reacted with brines containing NaCl and MgCl2, and the Mg(OH)2 washed and filtered. In Example 3 slaked calcined dolomite grains are soaked in MgCl2 brine and then transferred from one vessel to another in a series of vessels in counterflow to brine of increasing MgCl2 concentration, allowed to react for increasing periods of time, and then washed by transfer through a series of vessels in counterflow to water. Specification 881,813 is referred to.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR769127 | 1958-06-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB917395A true GB917395A (en) | 1963-02-06 |
Family
ID=8706855
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1631859A Expired GB917395A (en) | 1958-06-30 | 1959-05-12 | Improvements in or relating to the conversion of dolomite into magnesium hydroxide |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB917395A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3294485A (en) * | 1963-12-12 | 1966-12-27 | Dow Chemical Co | Process for producing magnesium hydroxide and a noncontaminated effluent solution |
| EP0038891A1 (en) * | 1980-04-30 | 1981-11-04 | Dalmia Institute Of Scientific And Industrial Research | Process for the production of magnesium oxide from brine or bittern |
-
1959
- 1959-05-12 GB GB1631859A patent/GB917395A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3294485A (en) * | 1963-12-12 | 1966-12-27 | Dow Chemical Co | Process for producing magnesium hydroxide and a noncontaminated effluent solution |
| EP0038891A1 (en) * | 1980-04-30 | 1981-11-04 | Dalmia Institute Of Scientific And Industrial Research | Process for the production of magnesium oxide from brine or bittern |
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