Síra (S)
Síra (S) Síra (S)
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<strong>Síra</strong> ra (S)<br />
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<strong>Síra</strong> ra<br />
13. prvok v zemskej kôre (0,06 %)<br />
S v Západných Z padných Karpatoch ……0,1 ……0,1<br />
%<br />
6 modifikácii modifik cii<br />
αS S (rombická) (rombick ) sa taví tav pri …… 112,8°C 112,8<br />
Nie je rozpustná rozpustn vo vode, ani v kyseline sírovej. s rovej.<br />
ahko ahko sa rozp rozpa<br />
a v sírouhl rouhlíku, ku, v rope, petroleji a v anilíne. anil ne.<br />
25 izotopov: 32 32S S (95.02%), 33 33S S (0.75%), 34 34S S (4.21%), 36 36S (0.02%).<br />
Tvrdos: Tvrdos : 1 – 2<br />
Merná Mern hmotnos: hmotnos : 2,05 g/cm3<br />
Prímesi Pr mesi - ílov lové minerály miner ly<br />
- karbonáty karbon ty<br />
- sírany rany → sadrovec a anhydrit<br />
- ropa + zemný plyn (inklúzie) (inkl zie)<br />
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Zdroje S<br />
prírodná síra S 100%<br />
pyrit FeS2 53,40% *<br />
chalkopyrit CuFeS2 34,90%<br />
galenit PbS 13,40%<br />
sfalerit ZnS 32,90%<br />
pyrotit NuFeS2 38,00%<br />
sádrovec CaSO4 . 2H2O 18,90%<br />
anhydrit CaSO4 23,60%<br />
ropné piesky priemer 1-5 %<br />
uhlie priemer 1,5%<br />
ropné bridlice priemer 0,3-6,2%<br />
ropa 0,5-6%<br />
kyselina sirová H2SO4 32,69%<br />
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90%<br />
80%<br />
70%<br />
60%<br />
50%<br />
40%<br />
30%<br />
20%<br />
10%<br />
0%<br />
Produkcia S<br />
Fraschov luhovací proces<br />
prírodná S<br />
pyrit<br />
vedají produkt<br />
1980 1990 2003 2007<br />
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Fraschov luhovací luhovac systém syst<br />
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Produkcia S ako vedaj ved ajieho ieho<br />
neidentif.<br />
35%<br />
produkutu 2007<br />
Ropa<br />
23%<br />
Metalurgia<br />
28%<br />
Zemný<br />
plyn<br />
14%<br />
SO 2<br />
H2S + 2O2 H2S + SO2 H 2 SO 4 , SO 2 (lq)<br />
alebo olej<br />
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petrolejárske<br />
rafinérie<br />
23%<br />
ostatné<br />
14%<br />
ponohospodárstvo<br />
15%<br />
Vyuitie Vyu itie S – US 2007<br />
spracovanie<br />
Cu rúd<br />
3%<br />
fosfátové<br />
hnojivá<br />
45%<br />
H2SO4<br />
60%<br />
S<br />
40%<br />
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Loisk Lo iská Síry: ry: genéza gen za<br />
1. Vulkanické Vulkanick loisk lo iská<br />
Exhalané Exhala (fumaroly, solfatary)<br />
§ 2H 2S S + SO 2 → 3S + 2H 2O<br />
hydrotermálne hydroterm lne (metasomatické (metasomatick zatlaovanie zatla ovanie<br />
okolitých tufov a láv) l v)<br />
Vulkano-sediment<br />
Vulkano sedimentárne rne (okolie výverov horúcich hor cich<br />
prameov) prame ov)<br />
Sírov rové jazierka i i prúdy pr dy (vulkanickými plyny –<br />
roztavenie S na stenách sten ch krátera) kr tera)<br />
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Kawah Ijen Vých. Java, Indonézia Indon ia<br />
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Loisk Lo iská Síry: ry: genéza gen za<br />
2. 2. Sedimentárne<br />
Sediment rne<br />
vrstevnaté vrstevnat<br />
biochemick biochemické<br />
diapírov diap rové (soné (so pne)<br />
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Schéma Sch ma biochemického biochemick ho vzniku S<br />
anaeróbna anaer bna fáza f za<br />
CaS VI VIO4 + CH 4 + desulfurikané desulfurika baktérie bakt rie → H2S-II II<br />
+ CaCO 3 + H 2O<br />
desulfurikané desulfurika baktérie bakt rie = anaeróbne anaer bne baktérie, bakt rie,<br />
ktoré ktor sa ivia ivia sírou, s rou, ij ijú v prostredí prostred s uhovod uh ovodíkmi kmi<br />
§ desulfovibrio desulfricans<br />
§ desulfovibrio orientis<br />
§ clostridium nigrificans<br />
Uhovod Uh ovodíky ky<br />
§ 2-4 4 bbl (1bbl = 159 l) na 1 tonu síry s ry<br />
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Schéma Sch ma biochemického biochemick ho vzniku S<br />
aer aeróbna bna fáza f za<br />
2H 2H2S-II II + O 2 → 2S 0 + 2H 2O<br />
Nepriepustn Nepriepustná vrstvá vrstv (napr. bridlice)<br />
zabrauje: zabra uje:<br />
§ Rozptýleniu H 2S<br />
§ Pokroilej Pokro ilej oxidácii oxid cii :aeróbne :aer bne baktérie bakt rie<br />
(Thiobacillus sp.)<br />
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Potvrdenie biochemického biochemick ho vzniku S<br />
CaSO 4, oxidané prostredie<br />
> S 34<br />
S, biogénne prostredie ><br />
S 32<br />
S 32 : S 34<br />
21,60 – 22,10<br />
22,20 – 22,70<br />
C 12 : C 13<br />
CaCO 3 diagenetické > C 13 87,50 – 88,50<br />
CaCO 3 síronosné > C 12 91,95 – 95,50<br />
C 12 viac v uhovodíkoch<br />
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Main Pass<br />
3 km<br />
do 70m<br />
G<br />
G – plyn, O – ropa, W - voda<br />
-<br />
40 - 160m<br />
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Posko Po sko – stratiformné stratiformn loisk lo iská S<br />
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4-8 x 25 km<br />
100 mil. t síry<br />
Tarnobrzeg<br />
Sarmatské krakowské íly<br />
Báden – síra + kalcit (10-17 m)<br />
Bádenské pieskyKarpatské íly<br />
Jurské vápence alebo bridlice kambria<br />
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Iraq –<br />
stratiformné stratiformn<br />
loisk lo iská S<br />
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