Reakcije kalcita u vodi i u prisustvu stearinske kiseline
Reactions of calcite in water in the presence of stearic acid
Abstract
U suspenziji kalcita i vode, čiji je pH 10,14, na granici kalcit/voda formirao se dvojni električni sloj. Njegova struktura, odnosno hidrofilne osobine minerala, su zavisile od koncentracije potencijal određujućih jona, Ca2+ i 2 CO 3 , pH sredine i adsorpcije molekula vode i jona (i molekula) formiranih u suspenziji kalcita usled njegove rastvorljivosti u alkalnoj sredini. Struktura tako formiranog dvojnog električnog sloja je uticala na interakciju minerala sa stearinskom kiselinom kao površinski aktivnom materijom. U prisustvu stearinske kiseline pH vrednost suspenzije je opadala do 8,72 zbog disocijacije stearinske kiseline u alkalnoj sredini i reakcije neutralizacije. Kao posledica disocijacije u suspenziji su se pored nedisosovanih molekula kiseline nalazili u određenoj koncentraciji i stearatni joni CH3(CH2)16COO-, (St-) koji su reagovali sa površinom minerala prevodeći je iz hidrofilne u hidrofobnu.
In the suspension of water and calcite, with pH 10.14, on the border of calcite / water was formed a double electric layer. Its structure, or hydrophilic properties of minerals, depended on the concentration of potential determination ions, Ca2+ i 2 CO3 , pH of the environment, and the adsorption of water molecules and ions (and molecules), formed in a suspension of calcite as a result of its solubility in alkaline media. The structure of such a way formed electrical double layer, influenced on interaction of minerals with stearic acid as a surface of active substance. In the presence of stearic acid, the pH value of slurry decreased to 8.72 due to the dissociation of stearic acid in alkaline medium and reaction of neutralization. As the result of dissociation, in the suspension, besides the un-dissociated acid molecules, there were also stearine ions CH3(CH2)16COO-, (St-), which have reacted with the surface of minerals, transforming it from hydrophilic to hydrophobic.
Keywords:
stearinska kiselina / rastvorljivost / kalcit / dvojni električni sloj / stearic acid / solubility / electric double leyer / calciteSource:
Mining and Metallurgy Engineering Bor, 2015, 3, 129-144Publisher:
- Institut za rudarstvo i metalurgiju, Bor
Funding / projects:
- Development of technological processes for obtaining of ecological materials based on nonmetallic minerals (RS-34013)
- Mechanochemistry treatment of low quality mineral raw materials (RS-34006)
Collections
Institution/Community
Institut za tehnologiju nuklearnih i drugih mineralnih sirovinaTY - JOUR AU - Mihajlović, Slavica AU - Sekulić, Živko AU - Kolonja, Božo M. AU - Radulović, Dragan PY - 2015 UR - https://ritnms.itnms.ac.rs/handle/123456789/340 AB - U suspenziji kalcita i vode, čiji je pH 10,14, na granici kalcit/voda formirao se dvojni električni sloj. Njegova struktura, odnosno hidrofilne osobine minerala, su zavisile od koncentracije potencijal određujućih jona, Ca2+ i 2 CO 3 , pH sredine i adsorpcije molekula vode i jona (i molekula) formiranih u suspenziji kalcita usled njegove rastvorljivosti u alkalnoj sredini. Struktura tako formiranog dvojnog električnog sloja je uticala na interakciju minerala sa stearinskom kiselinom kao površinski aktivnom materijom. U prisustvu stearinske kiseline pH vrednost suspenzije je opadala do 8,72 zbog disocijacije stearinske kiseline u alkalnoj sredini i reakcije neutralizacije. Kao posledica disocijacije u suspenziji su se pored nedisosovanih molekula kiseline nalazili u određenoj koncentraciji i stearatni joni CH3(CH2)16COO-, (St-) koji su reagovali sa površinom minerala prevodeći je iz hidrofilne u hidrofobnu. AB - In the suspension of water and calcite, with pH 10.14, on the border of calcite / water was formed a double electric layer. Its structure, or hydrophilic properties of minerals, depended on the concentration of potential determination ions, Ca2+ i 2 CO3 , pH of the environment, and the adsorption of water molecules and ions (and molecules), formed in a suspension of calcite as a result of its solubility in alkaline media. The structure of such a way formed electrical double layer, influenced on interaction of minerals with stearic acid as a surface of active substance. In the presence of stearic acid, the pH value of slurry decreased to 8.72 due to the dissociation of stearic acid in alkaline medium and reaction of neutralization. As the result of dissociation, in the suspension, besides the un-dissociated acid molecules, there were also stearine ions CH3(CH2)16COO-, (St-), which have reacted with the surface of minerals, transforming it from hydrophilic to hydrophobic. PB - Institut za rudarstvo i metalurgiju, Bor T2 - Mining and Metallurgy Engineering Bor T1 - Reakcije kalcita u vodi i u prisustvu stearinske kiseline T1 - Reactions of calcite in water in the presence of stearic acid EP - 144 IS - 3 SP - 129 DO - 10.5937/mmeb1503129m UR - conv_420 ER -
@article{ author = "Mihajlović, Slavica and Sekulić, Živko and Kolonja, Božo M. and Radulović, Dragan", year = "2015", abstract = "U suspenziji kalcita i vode, čiji je pH 10,14, na granici kalcit/voda formirao se dvojni električni sloj. Njegova struktura, odnosno hidrofilne osobine minerala, su zavisile od koncentracije potencijal određujućih jona, Ca2+ i 2 CO 3 , pH sredine i adsorpcije molekula vode i jona (i molekula) formiranih u suspenziji kalcita usled njegove rastvorljivosti u alkalnoj sredini. Struktura tako formiranog dvojnog električnog sloja je uticala na interakciju minerala sa stearinskom kiselinom kao površinski aktivnom materijom. U prisustvu stearinske kiseline pH vrednost suspenzije je opadala do 8,72 zbog disocijacije stearinske kiseline u alkalnoj sredini i reakcije neutralizacije. Kao posledica disocijacije u suspenziji su se pored nedisosovanih molekula kiseline nalazili u određenoj koncentraciji i stearatni joni CH3(CH2)16COO-, (St-) koji su reagovali sa površinom minerala prevodeći je iz hidrofilne u hidrofobnu., In the suspension of water and calcite, with pH 10.14, on the border of calcite / water was formed a double electric layer. Its structure, or hydrophilic properties of minerals, depended on the concentration of potential determination ions, Ca2+ i 2 CO3 , pH of the environment, and the adsorption of water molecules and ions (and molecules), formed in a suspension of calcite as a result of its solubility in alkaline media. The structure of such a way formed electrical double layer, influenced on interaction of minerals with stearic acid as a surface of active substance. In the presence of stearic acid, the pH value of slurry decreased to 8.72 due to the dissociation of stearic acid in alkaline medium and reaction of neutralization. As the result of dissociation, in the suspension, besides the un-dissociated acid molecules, there were also stearine ions CH3(CH2)16COO-, (St-), which have reacted with the surface of minerals, transforming it from hydrophilic to hydrophobic.", publisher = "Institut za rudarstvo i metalurgiju, Bor", journal = "Mining and Metallurgy Engineering Bor", title = "Reakcije kalcita u vodi i u prisustvu stearinske kiseline, Reactions of calcite in water in the presence of stearic acid", pages = "144-129", number = "3", doi = "10.5937/mmeb1503129m", url = "conv_420" }
Mihajlović, S., Sekulić, Ž., Kolonja, B. M.,& Radulović, D.. (2015). Reakcije kalcita u vodi i u prisustvu stearinske kiseline. in Mining and Metallurgy Engineering Bor Institut za rudarstvo i metalurgiju, Bor.(3), 129-144. https://doi.org/10.5937/mmeb1503129m conv_420
Mihajlović S, Sekulić Ž, Kolonja BM, Radulović D. Reakcije kalcita u vodi i u prisustvu stearinske kiseline. in Mining and Metallurgy Engineering Bor. 2015;(3):129-144. doi:10.5937/mmeb1503129m conv_420 .
Mihajlović, Slavica, Sekulić, Živko, Kolonja, Božo M., Radulović, Dragan, "Reakcije kalcita u vodi i u prisustvu stearinske kiseline" in Mining and Metallurgy Engineering Bor, no. 3 (2015):129-144, https://doi.org/10.5937/mmeb1503129m ., conv_420 .