ФИЗИКО-ХИМИЧЕСКИЕ ЗАКОНОМЕРНОСТИ АВТОКЛАВНОГО ВЫЩЕЛАЧИВАНИЯ СУЛЬФИДНОГО ЦИНКОВОГО КОНЦЕНТРАТА В ПРИСУТСТВИИ ЛИГНОСУЛЬФОНАТА

Translated title of the contribution: PHYSICAL AND CHEMICAL REGULARITIES OF ZINC SULFIDE CONCENTRATE PRESSURE LEACHING IN THE PRESENCE OF LIGNOSULFONATE

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Abstract

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.
Translated title of the contributionPHYSICAL AND CHEMICAL REGULARITIES OF ZINC SULFIDE CONCENTRATE PRESSURE LEACHING IN THE PRESENCE OF LIGNOSULFONATE
Original languageRussian
Pages (from-to)13-24
Number of pages12
JournalИзвестия высших учебных заведений. Цветная металлургия
Volume27
Issue number5
DOIs
Publication statusPublished - 2021

GRNTI

  • 53.00.00 METALLURGY

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  • VAK List

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