Wszystkie pola: phosphate removal - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Phosphate ore washing by Na2EDTA for cadmium removal: Optimization of the operating conditions
Autorzy:: Benredjem, Z.
Delimi, R.
Khelalfa, A.
Powiązania:: https://bibliotekanauki.pl/articles/779151.pdf
Data publikacji:: 2012
Wydawca:: Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:: phosphate ore washing
cadmium
environment
extraction
chemical processes
optimization
Opis:: This paper discusses the extraction of cadmium from phosphate ore by the washing method. Various parameters were investigated for the cadmium extraction from phosphate ore. The results from extraction tests showed that cadmium extraction depends on the nature and concentration of the extracting agent, the liquid/phosphate ore ratio, the temperature and the solution pH. The effi ciency of the nine extracting agents for removing cadmium from phosphate ore was found to be in the order: Na2EDTA > citric acid > tartric acid > ammonium citrate > calcium chloride > ammonium acetate > ammonium chloride > oxalic acid > ammonium hydroxide. In this study cadmium extraction kinetics was best described by the product layer diffusion control model.
Źródło:: Polish Journal of Chemical Technology; 2012, 14, 3; 15-20
1509-8117
1899-4741
Pojawia się w:: Polish Journal of Chemical Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Removal of low molecular organic acids from aqueous solutions with reactive extraction
Autorzy:: Szternel, D.
Regel-Rosocka, M.
Wiśniewski, M.
Powiązania:: https://bibliotekanauki.pl/articles/778825.pdf
Data publikacji:: 2013
Wydawca:: Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:: reactive extraction
trioctylamine
tributyl phosphate
Cyanex 923
fumaric
succinic
lactic
acetic acids
Opis:: This paper presents investigation on removal of low molecular organic acids (acetic, lactic, succinic and fumaric) from aqueous solutions with reactive extraction. The results specifically show that the extraction efficiency of acids depends on the type of extractant, diluents of the organic phase and the initial pH of the aqueous phase. It is possible to separate succinic or fumaric from lactic and acetic acids with high selectivity with the use of TOA and Aliquat 336, respectively. Increasing the pH of the aqueous phase results in a reduction of fumaric acid extraction efficiency with solvating extractants. This can be explained by the decreasing share of acidic form, whose extraction is favored by these extractants. Efficient extraction of both fumaric acid and fumarate using Aliquat 336 can be explained by the ionic structure of the quaternary ammonium salt, capable of transporting both forms of the acid.
Źródło:: Polish Journal of Chemical Technology; 2013, 15, 4; 5-9
1509-8117
1899-4741
Pojawia się w:: Polish Journal of Chemical Technology
Dostawca treści:: Biblioteka Nauki

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