Mieczysław Trypuć

Extraction of vanadium compounds from the used vanadium catalyst with the potassium hydroxide solution

Extraction of vanadium compounds from the used vanadium catalyst with the potassium hydroxide solution 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.

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

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 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.

Plotting of the solubility isotherm for the NH4NO3 + NaVO3 + H2O system

Plotting of the solubility isotherm for the NH4NO3 + NaVO3 + H2O system The equilibrium research was performed for the NH4NO3 + NaVO3 + NH4VO3 + NaNO3 + H2O system at 293 and 303 K. The location of the P1 and P2 triple points was determined on the equilibrium plots with the planar projection according to Jänecke method. The maximum yield of the conversion of ammonium nitrate(V) to ammonium vanadate(V) was calculated at P1 points. The results constitute the basis to design further equilibrium experiments aimed to precisely determine the lines separating the areas of the co-crystallization of salts in the investigated system on the equilibrium plots in the oblique projection on a plane according to Jänecke method.

Utilization of the post-filtration lye from the SCS method of soda production

Utilization of the post-filtration lye from the SCS method of soda production The mutual solubility of salts in the NaVO3-NaNO3-H2O system was investigated at 293 - 323 K temperature range by the method of isothermal saturation of solutions. A fragment of the solubility polytherm for that system was plotted, based on the obtained data. The investigated system is a part of the quaternary NH4NO3-NaVO3-NH4VO3-NaNO3 system, and it is necessary for plotting the solubility isotherm as a planar projection according to Janecke, since it defines one edge of its square. Knowledge of the isotherm for that quaternary system is necessary to determine the optimal utilization conditions for the post-filtration lye, formed during the soda production from NaNO3 by the Solvay method, using NaVO3.

Utilization of the post – filtration lye from the soda-chlorine-saltpetre method of soda production

Utilization of the post - filtration lye from the soda-chlorine-saltpetre method of soda production The optimal conditions were determined for the precipitation of ammonium metavanadate from the solutions of ammonium nitrate with the use of sodium metavanadate. The experiments were performed with the molar ratio of salts NH4NO3: NaVO3 1.5:1 at temperatures 293, 303, 313 and 323 K. Based on the obtained results, the optimal time of the process was determined as 5 h at 293-303K. Under these conditions, the achieved yield of the precipitation process was ~98.7%, while the contents of the vanadium salts in the post - filtration solution was ~0.02%.

Utilization of used contact masses from the oxidation state of sulfur(IV) oxide to sulfur(VI) oxide

Utilization of used contact masses from the oxidation state of sulfur(IV) oxide to sulfur(VI) oxide The research was conducted to determine the influence of the urea concentration in the leaching solutions on the efficiency of recovery of vanadium and iron compounds from the used vanadium catalyst from the node of oxidation of sulfur dioxide to sulfur trioxide.

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

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

The influence of the conditions and worktime on the waste vanadic catalyst amount

The influence of the conditions and worktime on the waste vanadic catalyst amount This paper includes the research results of the vanadic catalyst study that was operated in PCC Rokita S.A. during a gaseous SO3 formation. The physical properties have been studied: mechanical strength, bulk density and grindability during the five-year cycle of the catalyst worktime. The studies presented underline the prediction of the amount of the formed vanadic waste material.

The Influence of Urea on the KHCO 3 and NH 4 VO 3 Solubility in the KHCO 3 + NH 4 VO 3 + H 2 O System

The Influence of Urea on the KHCO3 and NH4VO3 Solubility in the KHCO3 + NH4VO3 + H2O System The influence of urea on the vanadium(V) and potassium ion concentrations in the KHCO3 + NH4VO3 + H2O system was determined in the temperature range of 293 K to 303 K. Additionally, the solution density dependence versus the urea concentration was presented. These data are essential for the assessment of optimum operating conditions for the new production process of potassium carbonate.

EFFECT OF KCL EXCESS AND INERT CARRIER ON THE YIELD OF KVO3 SYNTHESIS

Investigation was carried out on the optimal conditions of the synthesis of KVO3 and Cl2 from KCl and V2O5 in the presence of atmospheric oxygen. The influence of the excess of KCl relative to V2O5 was investigated. Also, the effect of quartz sand introduced into the reaction mixture on the yield of KVO3 synthesis was determined. The obtained product of synthesis was isolated from the post-reaction mixture.