Hydrometallurgical Treatment of Low Grade Zinc Oxide Ore

Abstract

In this research, a leaching study was carried out to assess the effect of several parameters on zinc extraction in a low grade complex zinc oxide ore in which the grade of Zn is 13 wt.%, and 52.8% of Zn is contained in siderite, 34.63% in limonite and 11.55% in smithsonite. The influencing parameters investigated include sulfuric acid concentration, reaction temperature, reaction time and liquid to solid ratio (L/S). The results show that over 90% of Zn can be extracted from the low grade complex zinc oxide ore when the leaching process is operated in 2M sulfuric acid at 60°C for 2.5h with a liquid to solid ratio of 6:1.

Kinetics Etude of the Experimental Leaching ofSphalerite Using Acidic Lixiviant

“…Effect of acid concentration: Increasing the concentration of sulfuric acid 0.5 to 2mol.l-1 significantly increased the rate of dissolution. It has irrefutably been shown that decreasing the pH (0.5 to 1.5) increases the rate of dissolution in sulfuric acid medium [10,11]. The experimental results obtained from Figure 2 showed that concentration of sulfuric acid had the maximum effect on the rate of zinc dissolution, after particle size, from 20 to 120 min of leaching.…”

Feasibility and reaction process for recovery of Si and Pb from high‐calcium zinc extraction residue by alkali roasting

“…[1,2] With the gradual exhaustion of zinc sulphide, low-grade zinc oxide ores that are difficult to treat using traditional technologies have received much attention. [3][4][5][6][7][8][9][10] In the past decades, many researchers have focused on developing methods for the comprehensive utilization of low-grade zinc oxide ore, especially the harmless utilization of zinc extraction residues [11][12][13] ; these contain a relatively high content of valuable metals such as silicon, lead, and strontium. Directly discarding or randomly burying the residue will not only reduce the efficiency of resource utilization, but also increase ecological pressure.…”