| چکیده انگلیسی مقاله |
With the increase in global demand for zinc metal and the decrease in the quality of its ores, as well as the non-responsiveness of the usual methods for this type of ores, the processing of this metal with other methods such as hip leaching becomes necessary. In this research, the high-leaching ability of the low-grade oxide ore of Mehdiabad, which was determined in the XRD analysis of the sample, was determined that barite, hematite, quartz, and goethite are the main phases, and chlorite and hemimorphite are the secondary phases present in the sample. Leaching experiments were designed in 2-meter columns, each containing 70 kg of samples. In these tests, the effect of particle size parameters, time and concentration of dissolution agent is investigated. To investigate these issues, a simple test was first conducted on the permeability of the solution into the sample, which was successful, and after several repetitions, it was finally determined with the specified input flow rate that the solution dissolves the zinc inside the sample and passes through it. slow According to the results of permeability tests, two granulations with particle sizes of 20 mm d80 and 12 mm d80 were considered for acid hip leaching. As the particle size increases, the permeability problems decrease, but due to the lower contact surface and then the less contact of the leaching solution with the solid surface, the recovery rate decreases. Therefore, if there is no permeability problem, heap leaching is done with smaller particle sizes. After a period of 4 months, which lasted for investigating the hip leaching process of Mehdi Abad oxide ore. The parameters of sulfuric acid concentration at pH = 1.5 at ambient temperature and particle size of 12-20 mm were investigated in two separate columns and the recovery was 28.65% for coarse grain column and 23.66% for fine grain column. . According to the determined recovery, it can be said that with the increase in the size of the particles, the recovery of zinc has increased slightly, and the reason for this is that with the increase in granulation, the percentage of soft matter in the test feed decreases, and this has caused a noticeable increase in leaching recovery. It can also be said that the size of different particles does not have much effect on zinc recovery and is not very effective. |
