OPTIMIZATION OF CHALCOPYRITE GALVANIC LEACHING IN THE PRESENCE OF PYRITE AND SILVER AS CATALYSTS BY USING RESPONSE SURFACE METHODOLOGY (RSM)
| Autor: | Mojtaba Yari, B.N. Akhgar, Amir Zeynali, Mahsa Pishravian, Sajjad Chehreghani, Hojjat Hosseinzadeh Gharehgheshlagh |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
lcsh:TN1-997
Materials science Central composite design dissolution galvanic effect engineering.material response surface methodology Copper extraction techniques Galvanic cell halkopirit otapanje efekt galvanizacije metoda odzivne površine Response surface methodology Dissolution lcsh:Mining engineering. Metallurgy Water Science and Technology Chalcopyrite lcsh:QE1-996.5 Geology Geotechnical Engineering and Engineering Geology chalcopyrite lcsh:Geology General Energy Chemical engineering visual_art visual_art.visual_art_medium engineering General Earth and Planetary Sciences Leaching (metallurgy) Pyrite |
| Zdroj: | Rudarsko-geološko-naftni zbornik Volume 36 Issue 1 Rudarsko-geološko-naftni Zbornik, Vol 36, Iss 1, Pp 37-47 (2021) |
| ISSN: | 1849-0409 0353-4529 |
| Popis: | In this research, dissolution of chalcopyrite concentrate is modelled and optimized using Response Surface Methodology (RSM). Also, effective parameters in the leaching process such as the amount of pyrite, silver ions, redox potential and initial concentration of acid are comprehensively studied. Central Composite Design (CCD) methodology is chosen as the design matrix to predict the optimum level of the parameters. In the next step, it will be proven that in the presence of silver ions, pyrite effectiveness is improved and also the chalcopyrite dissolution rate is increased considerably. Using the result of quadratic programming, a rotation speed of 1000 rpm, a pyrite/chalcopyrite mass ratio of 3:1, the amount of 150 ppm silver ion, a solution potential set point of 470 mV, at 800°C and 25 g/L initial acid concentration are the optimal level of the selected parameters wherein the maximum copper extraction with more than 95% in less than 10 hours can be accessible. U ovome istraživanju modelirano je otapanje koncentriranoga halkopirita te je proces optimiziran uporabom metode odzivne površine. Također su istražene efektivne varijable tijekom toga procesa, i to količina pirita, iona srebra, redokspotencijal i početna koncentracija kiseline. Metodom središnjega kompozitnog dizajna određena je matrica za predviđanje najboljega odnosa tih varijabli. Nakon toga je pokazano kako nazočnost iona srebra povećava efi kasnost pirita, što je rezultiralo znatno većom topivošću halkopirita. Kvadratičnim programiranjem određene su sljedeće vrijednosti kao optimalne: brzina rotacije od 1000 okretaja u minuti, zatim maseni odnos pirita i halkopirita 3 : 1, koncentracija iona srebra 150 ppm, potencijal topivosti od 470 mV na 800 ⁰C te početna koncentracija kiselina 25 g/L. Time je postignuto maksimalno izluživanje bakra (uspješnosti veće od 95 %) za vrijeme kraće od 10 sati. |
| Databáze: | OpenAIRE |
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