The study covers physical and chemical regularities of zinc sulfide concentrate oxygen pressure leaching in sulfuric acid. The effect of lignosulfonate concentration ( C LSN = 0.2÷0.8 g/dm3), leaching time (τ = 20÷120 min), temperature ( T = 393÷423 K), and oxygen partial pressure ( Р О2 = 0.3÷0.7 MPa) on the degree of zinc and iron extraction into the solution and on the cake grain-size distribution was established.It was shown that lignosulfonate additive intensifies zinc and iron extraction into the solution. Maximum extraction of zinc and iron was 89and 37 %, respectively, for 120 min of leaching at C LSN = 0.6÷0.8 g/dm3. The differential rate law with respect to lignosulfonate was 0.3 for sphalerite, and 0.9 for iron sulfides. A controversial inf luence of rising temperature on the process under investigation was found. Temperature elevation from 413 to 423 K leads to a decrease in zinc extraction by 3-4 % due to the formation of sulfur-sulfide aggregates over 150 μm in size. The calculated values of apparent activation energy ( Е а) of sphalerite and iron sulfide leaching in the presence of lignosulfonate were 30 and45 kJ/mole, respectively. It was found out that an increase in oxygen partial pressure from 0.3 to 0.5 MPa has a positive inf luence on leachingand increases extraction of zinc and iron by 22 and 27 %, respectively. However, an increase in oxygen partial pressure up to 0.7 MPa in the presence of lignosulfonate after 40 min of leaching led to a decrease in leaching rate, possibly as a result of lignosulfonate destruction. It was found that differential rate laws with respect to oxygen are 1.2 for sphalerite and 2.5 for iron sulfides.
|投稿的翻译标题||PHYSICAL AND CHEMICAL REGULARITIES OF ZINC SULFIDE CONCENTRATE PRESSURE LEACHING IN THE PRESENCE OF LIGNOSULFONATE|
|期刊||Известия высших учебных заведений. Цветная металлургия|
|州||Published - 2021|
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