GB668755A - Improvements in process and apparatus for the manufacture of mixtures of magnesia and calcium carbonate - Google Patents
Improvements in process and apparatus for the manufacture of mixtures of magnesia and calcium carbonateInfo
- Publication number
- GB668755A GB668755A GB32357/49A GB3235749A GB668755A GB 668755 A GB668755 A GB 668755A GB 32357/49 A GB32357/49 A GB 32357/49A GB 3235749 A GB3235749 A GB 3235749A GB 668755 A GB668755 A GB 668755A
- Authority
- GB
- United Kingdom
- Prior art keywords
- dolomite
- carbon dioxide
- heating
- calcined
- magnesia
- 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
- C01F5/24—Magnesium carbonates
-
- 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
- C01F11/00—Compounds of calcium, strontium, or barium
- C01F11/18—Carbonates
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)
Abstract
A mixture of magnesia and calcium carbonate, for use in the industrial purification of water, is prepared by heating raw or calcined and subsequently hydrated dolomite to 500 DEG -800 DEG C. (preferably 700 DEG -800 DEG C.) in the presence of carbon dioxide, and cooling the product also in the presence of carbon dioxide. Hydrated calcined dolomite may be granulated before treatment. The carbon dioxide used may result from the heating of raw dolomite, from combustion gases, or from the roasting of other ores. The process is carried out continuously in a rotary furnace having heating and cooling zones (see Group XII). The dolomite may be preheated by combustion gas from the furnace. Any free lime present in the product lies in the core of the pieces and not on the surface.ALSO:A mixture of magnesia and calcium carbonate, for use in the industrial purification of water, is prepared by heating raw or calcined and subsequently hydrated dolomite to 500 DEG -800 DEG C (preferably 700 DEG -800 DEG C) in the presence of carbon dioxide, and cooling the product also in the presence of carbon dioxide. Hydrated calcined dolomite may be granulated before treatment. The carbon dioxide used may result from the heating of raw dolomite, from combustion gases, or from the roasting of other ores. The process is carried out continuously in a rotary furnace having heating and cooling zones (see Group XII). The dolomite may be preheated by combustion gas from the furnace. Any free lime present in the product lies in the core of the pieces and not on the surface.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR668755X | 1948-12-21 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB668755A true GB668755A (en) | 1952-03-19 |
Family
ID=9015262
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB32357/49A Expired GB668755A (en) | 1948-12-21 | 1949-12-16 | Improvements in process and apparatus for the manufacture of mixtures of magnesia and calcium carbonate |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB668755A (en) |
-
1949
- 1949-12-16 GB GB32357/49A patent/GB668755A/en not_active Expired
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