PL21608B1 - Method for obtaining chemically pure MgC0a and MgO from dolomite. - Google Patents
Method for obtaining chemically pure MgC0a and MgO from dolomite. Download PDFInfo
- Publication number
- PL21608B1 PL21608B1 PL21608A PL2160834A PL21608B1 PL 21608 B1 PL21608 B1 PL 21608B1 PL 21608 A PL21608 A PL 21608A PL 2160834 A PL2160834 A PL 2160834A PL 21608 B1 PL21608 B1 PL 21608B1
- Authority
- PL
- Poland
- Prior art keywords
- dolomite
- carbonate
- chemically pure
- magnesium
- mgo
- Prior art date
Links
- 229910000514 dolomite Inorganic materials 0.000 title claims description 13
- 239000010459 dolomite Substances 0.000 title claims description 13
- 238000000034 method Methods 0.000 title claims description 9
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 11
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 8
- 239000011777 magnesium Substances 0.000 claims description 5
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 4
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 claims description 4
- 239000001095 magnesium carbonate Substances 0.000 claims description 4
- 229910000021 magnesium carbonate Inorganic materials 0.000 claims description 4
- 239000000395 magnesium oxide Substances 0.000 claims description 4
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 4
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims description 4
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 claims description 3
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 3
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims description 3
- 239000000920 calcium hydroxide Substances 0.000 claims description 3
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims description 3
- 229910052749 magnesium Inorganic materials 0.000 claims description 3
- BVKZGUZCCUSVTD-UHFFFAOYSA-M Bicarbonate Chemical compound OC([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-M 0.000 claims 2
- 239000011398 Portland cement Substances 0.000 claims 1
- 229960004424 carbon dioxide Drugs 0.000 claims 1
- 235000011089 carbon dioxide Nutrition 0.000 claims 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 5
- 229910052783 alkali metal Inorganic materials 0.000 description 2
- -1 alkali metal bicarbonates Chemical class 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000010802 sludge Substances 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 150000005323 carbonate salts Chemical class 0.000 description 1
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 description 1
- 239000000347 magnesium hydroxide Substances 0.000 description 1
- 229910001862 magnesium hydroxide Inorganic materials 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 150000004760 silicates Chemical class 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Description
Dotychczas znane sa dwie metody otrzy- mit rozdrabnia sie, miesza z weglanami albo mywania MgCO:i z dolomitu. dwuweglanami metali alkalicznych, rozpu- Pierwsza metoda polega na tern, ze na szcza w wodzie, nasyconej dwutlenkiem wypalony i zgaszony dolomit dziala sie wegla, i podgrzewa do 60—70°C. W tej tem- wprost dwutlenkiem wegla, w celu otrzyma- peraturze roztwór, zawierajacy magnez jako nia weglanu magnezu, latwiej rozpuszczal- podwójna sól weglanowa magnezowo-alka- nego w wodzie od kwasnego weglanu wap- liczna, zostaje oddzielony od wytraconego nia. Ta metoda jednak nie mozna otrzymac weglanu wapnia i innych skladników nieroz- chemicznie czystego weglanu magnezu, gdyz puszczalnych, poczem po odsaczeniu osadu pod dzialaniem C02 rozpuszcza sie takze roztwór ogrzewa sie do 100°C, dzieki cze- znaczna ilosc kwasnego weglanu wapnia. mu osadza sie nierozpuszczalny weglan ma- Druga metoda jest bardziej skompliko- gnezowy, w roztworze zas pozostaje weglan wana. Wedlug tej metody wypalony dolo- metalu alkalicznego.Sposób wedlug wynalazku opiera sie na niewyzyskanej dotychczas wlasciwosci wy¬ zarzonego i zwietrzalego dolomitu, poddane¬ go dzialaniu czystej wody, wplnej od za¬ wiesin mechanicznych.Zarówno weglan, jak i tlenek magnezu, otrzymane tym sposobem, sa chemicznie czyste.Dolomit, wyprazony w temperaturze 800—850°C, zawierajacy jeszcze 3—10% C021 nastepnie wystawiony na dluzsze wie¬ trzenie, wprowadza sie w postaci rozdrob¬ nionej do wody o temperaturze 18—20°C.Dolomit w wodzie rozklada sie w ten sposób, ze najpierw CaO przechodzi w Ca(OH)2, MgO zas tworzy wodorotlenki tylko w ilosci bardzo malej. Ilosc wody, po¬ trzebnej do rozlozenia jednostki wagowej dolomitu, wynosi 25—30 jednostek wago¬ wych. Czas potrzebny do rozkladu dolomitu w powyzej podany sposób wynosi 2 do 2,1 godzin. Dluzsze dzialanie wody nie jest wskazane, poniewaz po dluzszym czasie o- bok wodorotlenku wapnia zaczyna sie two¬ rzyc wodorotlenek magnezu w wiekszej ilo¬ sci. Po 2—211 godzinach do mieszaniny wo¬ dy i dolomitu wprowadza sie C021 w celu wytracenia wodorotlenku wapnia i rozpu¬ szczenia tlenku magnezu. Dwutlenku wegla uzywa sie w pewnym nadmiarze wskutek tego, ze pewna ilosc C0.2 zuzywa sie do na¬ sycenia wody, uzytej do rozlozenia dolomi¬ tu. Wytracony szlam wapniowy wraz z nie- rozlozonemi krzemianami i kwarcem odsa¬ cza sie, a klarowny przesacz podgrzewa, w celu wytracenia zawartego w nim weglanu magnezu. Wytracanie zaczyna sie w tempe¬ raturze 70°C, a konczy sie w 92—94°C.Osad, którego sklad w przyblizeniu przed¬ stawia wzór 3 MgCo,. Mg(OH)2. 3 H20, jest barwy jasno bialej i bardzo lekki. Za¬ wartosc wody w tym osadzie zmienia sie z temperatura i w temperaturze 95°C woda stanowi w nim tylko jedna czasteczke Mg(HCO:J2. Z tego weglanu magnezu, wy¬ palonego w temperaturze 850—900°C (bez stosowania prózni, gdyz przy jej zastosowa¬ niu wystarczy temperatura 550°C), otrzy¬ muje sie tlenek magnezu.CO2 glówny i jedyny odczynnik, stoso¬ wany przy przeróbce wedlug wynalazku, przy uzyciu odpowiednich urzadzen moze byc odzyskiwany zpowrotem, z wyjatkiem tych ilosci COz1 które zuzywa sie do wytra¬ cenia CaO. Sposób umozliwia wydzielenie ^ dolomitu 70—75% zawartosci magnezu. PLSo far, there are two known methods of grinding, mixing with carbonates or washing with MgCO: and dolomite. alkali metal bicarbonates, dissolving The first method is based on the fact that in water saturated with dioxide, the quenched and quenched dolomite is exposed to carbon and heated to 60-70 ° C. At this point, the carbon dioxide solution, in order to obtain the temperature, the solution containing magnesium as magnesium carbonate, more easily dissolves the magnesium-alkali double carbonate salt in water from the acidic calcium carbonate, is separated from the precipitated. However, this method cannot obtain calcium carbonate and other components of non-chemically pure magnesium carbonate, since they are soluble, and then after sludge filtration under the action of CO 2, the solution is also heated to 100 ° C, thanks to a large amount of acid calcium carbonate. the insoluble ma- carbonate is deposited on it. The second method is more complicated and the carbonate remains in the solution. According to this method, fired dolo-alkali metal. The method according to the invention is based on the hitherto unexplored property of fumed and weathered dolomite, subjected to the action of pure water, influenced by mechanical suspensions. Both the carbonate and the magnesium oxide obtained in this way. are chemically pure. Dolomite, calcinated at 800-850 ° C, containing 3-10% of CO21, then exposed to prolonged airing, is introduced in fine form into water at a temperature of 18-20 ° C. Dolomite in It is decomposed in water in such a way that CaO first turns into Ca (OH) 2, and MgO forms hydroxides only in a very small amount. The amount of water needed to break down one weight unit of dolomite is 25-30 weight units. The time required to decompose dolomite in the above-mentioned manner is 2 to 2.1 hours. Longer exposure to the water is not advisable, since after an extended period of time the side of the calcium hydroxide begins to form more magnesium hydroxide. After 2 to 211 hours, CO21 is introduced into the water-dolomite mixture to precipitate the calcium hydroxide and dissolve the magnesium oxide. Carbon dioxide is used in some excess due to the fact that some CO2 is used to saturate the water used to break down dolomite. The precipitated calcium sludge together with undecomposed silicates and quartz are filtered off, and the clear percolate is heated in order to destroy the magnesium carbonate contained therein. Precipitation begins at 70 ° C and ends at 92-94 ° C. A precipitate whose composition is approximately represented by the formula 3 MgCo. Mg (OH) 2. 3 H20, it is light white and very light. The water content of this sediment changes with the temperature, and at 95 ° C, the water in it is only one Mg molecule (HCO: J2. when it is used, the temperature of 550 ° C is sufficient), one obtains magnesium oxide. CO2 is the main and only reagent used in the processing according to the invention, with the use of appropriate equipment it can be recovered back, except for those amounts of CO2 which are consumed The process makes it possible to separate 70-75% of the magnesium content of dolomite.
Claims (1)
Publications (1)
| Publication Number | Publication Date |
|---|---|
| PL21608B1 true PL21608B1 (en) | 1935-06-28 |
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