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Precipitation of Calcium Carbonate in the Presence of Urea at 293 K and 343 K

100%
Białowicz K., Kiełkowska U.
Polish Journal of Chemical Technology
|
2014
|
vol. 16
|
issue 2
95-98
EN
The results of the precipitation of calcium carbonate from a waste post-distillation liquid (DS) and a sodium bicarbonate saturated solution – both from the Solvay method – in the presence of urea are presented. The investigation was carried out at 293 K and 343 K. Reagent dosage times of 1, 5, 10, 20 and 30 min, and urea concentrations of 5, 6 and 10 mol/dm3 were applied. The granulometric composition, the values of bulk and packing densities and the absorptiveness sorption of water and paraffin oil from the obtained calcium carbonate were investigated.
2
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Leaching of vanadium(V) from the mixture after potassium metavanadate synthesis based on KCl and spent vanadium catalyst

81%
Kiełkowska U., Białowicz K., Drużyński S.
Polish Journal of Chemical Technology
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2013
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vol. 15
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issue 4
33-35
EN
The results of the leaching of vanadium(V) from the mixture after potassium metavanadate synthesis from KCl and spent vanadium catalyst in the presence of steam were presented. Spent vanadium catalyst was obtained from the waste storage of a chemical plant producing sulfuric acid(VI) by the contact method. The reaction mixture was leached using different solutions: 1 M Na2CO3, 20% CO(NH2)2, 15% NaOH, 15% KOH, 2 M H2SO4. The effect of time and temperature was studied. The results showed that for reaction mixture leached for 4 h at 303 K in the presence of 15% sodium hydroxide solution at a liquid:solid ratio of 10:1, the extent of leaching of vanadium(V) was 95.43%.
3
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The Use of Ion Exchange in the Recovery of Vanadium from the Mass of a Spent Catalyst Used in the Oxidation of SO2to SO3

81%
Drużyński S., Mazurek K., Białowicz K.
Polish Journal of Chemical Technology
|
2014
|
vol. 16
|
issue 2
69-73
EN
In the studies on the recovery of vanadium from vanadium catalyst extracts, three types of polymer strongly acidic ion exchangers were used. The ion exchange resins differed in terms of granularity and their ion exchange capacity. As a result, breakthrough curves were made for three main components of the test extract, i.e.: ions of vanadium, iron and potassium. On this basis the optimum conditions for the removal of iron ions from the solution were defined and the technological concept of the process in the semi-technical scale was proposed.
4
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Extraction of vanadium compounds from the used vanadium catalyst with the potassium hydroxide solution

81%
Mazurek K., Białowicz K., Trypuć M.
Polish Journal of Chemical Technology
|
2010
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vol. 12
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issue 1
23-28
EN
The paper presents the results of the research on the degree of the recovery of vanadium(V) from the used vanadium catalyst with the use of KOH solution. The extraction was performed at 293 - 323 K, for 0.5 to 4 h and the catalysts of the variable grain diameter. The concentration of the extracting solution was varied in the range 5 - 20%. The optimal ratio of solid to liquid phase S/L was determined. Additionally the degree of the recovery of total iron ions was presented.
5
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The influence of leaching solution pH and addition of peroxide hydrogen on the recovery of some components from the used vanadium catalyst with urea solutions

81%
Mazurek K., Trypuć M., Białowicz K., Drużyński S.
Polish Journal of Chemical Technology
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2008
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vol. 10
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issue 4
34-36
EN
The research was conducted to determine the influence of the pH of the leaching solutions and hydrogen peroxide addition on the efficiency of the recovery of vanadium, potassium and iron compounds from the used vanadium catalyst from the node of oxidation of sulfur dioxide to sulfur trioxide.
6
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Vanadium pentoxide application for the synthesis of NaVO3in the presence of oxygen

81%
Białowicz K., Trypuć M., Mazurek K., Kiełkowska U.
Polish Journal of Chemical Technology
|
2008
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vol. 10
|
issue 4
4-6
EN
Investigation was carried out on the optimal conditions of the synthesis of NaVO3 and Cl2 from NaCl and V2O5 in the presence of the atmospheric oxygen. The influence of the excess of NaCl relative to V2O5 was investigated. Also the effect of the quartz sand introduced into the reaction mixture on the yield of the NaVO3 synthesis was determined. The obtained product of synthesis was isolated from the post-reaction mixture.
7
Content available remote

Precipitation of calcium carbonate in the presence of urea at 293K

81%
Białowicz K., Kiełkowska U., Trypuć M.
Polish Journal of Chemical Technology
|
2008
|
vol. 10
|
issue 4
7-10
EN
The results of the precipitation of calcium carbonate from waste distillation liquor (DS) from the Solvay method and sodium bicarbonate saturated solution in the presence of urea were presented. The investigation was carried out at 293K. The influence of the time of reagents dosage to the solution of urea on the physicochemical character of obtaining product was studied. The time of reagents dosage: 1, 5, 10, 20, 30 min and the concentration of the urea applied: 0.5, 1, 2 and 4 mol/dm3. The granulometric composition, the values of bulk and packing densities and the absorptiveness sorption of water and paraffin oil of the obtaining calcium carbonate were investigated.
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