Study of the reaction between dolomite and nitric acid

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22310%2F19%3A43916288" target="_blank" >RIV/60461373:22310/19:43916288 - isvavai.cz</a>

Výsledek na webu

<a href="http://www.minproc.pwr.wroc.pl/journal/pdf/ppmp18140.pdf" target="_blank" >http://www.minproc.pwr.wroc.pl/journal/pdf/ppmp18140.pdf</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.5277/ppmp18140" target="_blank" >10.5277/ppmp18140</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Study of the reaction between dolomite and nitric acid

Popis výsledku v původním jazyce

This paper is focused on the kinetics of the reaction between natural dolomite and diluted solutions of nitric acid at various temperatures. All experiments were carried out in a semi-batch reactor with an approximately constant nitric acid concentration using the pH-stat titration method. The reaction was studied in the temperature range from 293 to 353 K and the nitric acid concentration in the range from 0.001 to 0.200 mol dm-3. The strong effects of both temperature and nitric acid concentration were observed. The determined fractional values of the apparent reaction order (0.39 to 0.75) indicate a very complex reaction mechanism. In the studied concentration range, the values of the apparent activation energy increase from 30 to 58 kJ mol-1. Based on these data it can be assumed that the reaction takes place in the transitional regime with the stronger influence of chemical reaction. This assumption was verified by calculation of the nitric acid concentration on the surface of the dolomite grain using Sherwood criterion equation. The change in the role of the rate-controlling step was found for highly diluted solutions (&lt; 0.010 mol dm-3 HNO3).

Název v anglickém jazyce

Study of the reaction between dolomite and nitric acid

Popis výsledku anglicky

This paper is focused on the kinetics of the reaction between natural dolomite and diluted solutions of nitric acid at various temperatures. All experiments were carried out in a semi-batch reactor with an approximately constant nitric acid concentration using the pH-stat titration method. The reaction was studied in the temperature range from 293 to 353 K and the nitric acid concentration in the range from 0.001 to 0.200 mol dm-3. The strong effects of both temperature and nitric acid concentration were observed. The determined fractional values of the apparent reaction order (0.39 to 0.75) indicate a very complex reaction mechanism. In the studied concentration range, the values of the apparent activation energy increase from 30 to 58 kJ mol-1. Based on these data it can be assumed that the reaction takes place in the transitional regime with the stronger influence of chemical reaction. This assumption was verified by calculation of the nitric acid concentration on the surface of the dolomite grain using Sherwood criterion equation. The change in the role of the rate-controlling step was found for highly diluted solutions (&lt; 0.010 mol dm-3 HNO3).

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10402 - Inorganic and nuclear chemistry

Projekt

—

Návaznosti

S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2019

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Physicochemical Problems of Mineral Processing

ISSN

1643-1049

e-ISSN

—

Svazek periodika

55

Číslo periodika v rámci svazku

2

Stát vydavatele periodika

PL - Polská republika

Počet stran výsledku

10

Strana od-do

370-379

Kód UT WoS článku

000465257600005

EID výsledku v databázi Scopus

2-s2.0-85062286547