Search Results

You are looking at 1 - 10 of 24 items for

  • Author: Krzysztof Mazurek x
Clear All Modify Search
Open access

Krzysztof Mazurek

Extraction of vanadium and potassium compounds from the spent vanadium catalyst from the metallurgical plant

A spent vanadium catalyst, from the plant of metallurgical type, was leached in a sulfuric acid solution to recover vanadium and potassium compounds. The effect of time, temperature, concentration of acid, catalyst particle size and phase ratio was studied. Additionally the concentration of iron, copper, zinc, arsenic and lead compounds was determined. The flow sheet for the proposed process of spent vanadium catalyst leaching is presented.

Open access

Mieczysław Trypuć, Sebastian Drużyński and Krzysztof Mazurek

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.

Open access

Krzysztof Mazurek, Katarzyna Białowicz and Mieczysław Trypuć

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.

Open access

Krzysztof Mazurek

Abstract

The effect of time, temperature, the catalyst particle size and the ratio of the catalyst weight to the leaching solution volume (S:L) on the treatment of spent vanadium catalyst components was determined using citric acid solutions at atmospheric pressure. The optimal parameters of catalyst leaching in 10% acid solutions at atmospheric pressure are: T = 323 K, t = 4 h, the particle size of less than 0.160 mm, the S:L ratio below 0.1. Under these conditions it was possible to dissolve about 90% of vanadium and potassium compounds and more than 60% of iron compounds contained in the catalyst. These results fall within the scope of research on a comprehensive method for recovering spent vanadium catalyst components.

Open access

Krzysztof Mazurek, Piotr Grzesiak, Sebastian Drużyński, Urszula Kiełkowska, Adriana Wróbel and Aleksandra Szalla

Abstract

A spent vanadium catalyst, from the plant of metallurgical type, was leached in a potassium hydroxide solution to recover vanadium. The effect of time, temperature, concentration of basic, catalyst particle size and phase ratio was studied. The results showed that for a 160-750 μm catalyst leached for 4 h at 313.15 K in the presence of 10% potassium hydroxide solution at a liquid: solid ratio of 20:1, the extent of leaching of V was about 87%. Additionally, separation of vanadium from such a solution was investigated by the ion exchange method. Two types of polymer strongly basic ion exchangers were used. The ion exchange tests indicate that vanadium were loaded from the post-leaching solution with high effi ciency. On this basis a fl owsheet for the proposed process of a complex utilization of the spent vanadium catalyst is presented.

Open access

Mieczysław Trypuć, Krzysztof Mazurek, Urszula Kiełkowska and Sebastian Drużyński

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.

Open access

Piotr Grzesiak, Rafał Motała, Marcin Grobela, Mieczysław Trypuć and Krzysztof Mazurek

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.

Open access

Anna Czajkowska, Krzysztof Mazurek, Grażyna Lutosławska and Piotr Żmijewski

Anthropometric and cardio-respiratory indices and aerobic capacity of male and female students

Study aim: To assess the relations between anthropometric and cardio-respiratory indices, and aerobic capacity of students, differing in the level of physical activity, under resting and exercise conditions.

Material and methods: A group of 87 male and 75 female students volunteered to participate in the study. Their physical activity was evaluated by Seven-Day Physical Activity Recall questionnaire. Anthropometric (body height and mass, body fat content, BMI and WHR) and physiological indices (heart rate, blood pressure, O2max, CO2 and minute ventilation) were recorded. Body fat content was determined using a BIA device; respiratory data were recorded in a cycle ergometer test. The subjects were classified by their O2max values into ‘high’ or ‘low’ categories, the cut-off values of lower and upper quartiles serving as criteria.

Results: Male and female students expended 10.2 ± 4.6 and 8.4 ± 5.3 kcal/kg/day, respectively, the O2max amounting to 48.4 ± 6.4 and 41.1 ± 4.7 ml/kg/min, respectively. Subjects having high O2max had significantly higher energy expenditure on physical activities, fat-free mass, body water content and maximal ventilation, and lower body mass, BMI, body fat content, resting heart rate and diastolic pressure.

Conclusions: When investigating into the relationships between physical activity and physiological features, the latter ought to be related to O2max rather than to energy expenditure which may depend on other than physiological variables.

Open access

Katarzyna Białowicz, Mieczysław Trypuć, Krzysztof Mazurek and Urszula Kiełkowska

Vanadium pentoxide application for the synthesis of NaVO3 in the presence of oxygen

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.

Open access

Katarzyna Witek, Krzysztof Mazurek, Anna Mróz, Anna Czajkowska and Anna Kęska

Summary

Study aim: the aim of study was assessment somatic features and selected cardio-ventilatory indices in men above 50 years old with different physical activity levels.

Materials and methods: the study included 55 men on average aged 54.5 ± 4.32, classified to the trained group (T), n = 33, and not trained group (NT), n = 22. Total physical activity was assessed using the SDPAR Questionnaire. Measurements: anthropometric indices, ventilatory indices and VO2 peak, hemodynamic indices and fatigue using Borg scale during exercise maximal test.

Results: daily energy expenditures for sport and recreation differ significantly between T and NT groups, 6.82 METs vs. 0.2 METs, respectively (p < 0.001). Men in T and NT groups significantly differ in somatic features, and cardio-pulmonary indices including: time of physical tests effort (s) 1103 ± 193 vs. 681 ± 328; max speed (km/h) 14 ± 1.5 vs. 10 ± 1.4, VE peak 135.9 ± 21.17 l/min vs. 112.9 ± 21.49 l/min; VO2 peak 61.8 ± 8.83 ml/kg/min vs. 41.9 ± 8.55 ml/kg/min; HR rest (beat/min) 69 ± 16.95 vs. 83 ± 14.48; HR peak (beat/min) 171 ± 1.23 vs. 163 ± 15.28; SV peak (ml) 162 ± 24.23 vs. 135 ± 33.22; CO peak 27.4 ± 4,3 vs. 21.6 ± 5.17.

Conclusions: men aged 50+ who practice running training differ favourably and significantly from men not trained in anthropometric as well as cardio-ventilatory indices. Significant correlations were found between DEE and FAT(%), VO2 peak (ml/kg/min), SV peak (ml) and COpeak (l/min) as well between CO peak and VO2peak was record linear relationship (r = 0.56).