نوع مقاله : مقاله پژوهشی
نویسندگان
1 دانشگاه صنعتی سهند
2 هیئت علمی دانشکده مهندسی مواد دانشگاه صنعتی سهند
چکیده
کلیدواژهها
عنوان مقاله [English]
نویسندگان [English]
In this study the effect of sulfuric acid baking process on the leaching behavior of the sulfide concentrates of Sungun copper mines was investigated. The effect of temperature and time of baking and weight ratio of acid to concentrate were studied. The response surface method (RSM) with 3 factors in 5 levels (temperatures of 170, 200, 215, 230 and 260 ℃, times of 30, 90, 120, 150 and 210 minutes and the weight ratio of acid to concentrate of 0.5, 1.5, 2, 2.5 and 3.5) was used in experimental design of baking process. The baked products were leached at distilled water in constant temperature of 60 ℃ for 45 minutes with solid to liquid ratio of 30 g/L. The maximum copper leaching efficiency of 96% was obtained under the following baking conditions: 230 ℃ of baking temperature, 90 min of baking time and 2.5 of the weight ratio of acid to concentrate. The RSM model predicted the maximum copper leaching efficiency of 97% for baked concentrates at 205 ℃ for 177 min. with acid to concentrate ratio of 2.1, which it was confirmed by experiment. Also, the phase analysis using XRD patterns confirmed the converting of insoluble chalcopyrite to water soluble sulfates during acid baking process and showed the elemental sulfur in baked products and leaching residues.
کلیدواژهها [English]