Co-recovery of Mn and Fe from pyrolusite and copper slag with hydrometallurgy process: Kinetics and leaching mechanisms

With the shortage of high-quality raw materials and increasingly strict environmental regulations, the recovery of metals from copper slag and pyrolusite has become a research hotspot. A novel method for simultaneously extracting Mn and Fe from pyrolusite and copper slag has been proposed. Under the...

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Bibliographic Details
Published in:Environmental science and pollution research international 2023-12, Vol.30 (60), p.125877-125888
Main Authors: Wang, Lanbin, Chen, Yu, Xu, Yangming, Ma, Yanping, Du, Yaguang
Format: Article
Language:English
Subjects:
Aquatic Pollution
Atmospheric Protection/Air Quality Control/Air Pollution
Chemical kinetics
Chemical reactions
Copper
Copper - analysis
Earth and Environmental Science
Ecotoxicology
Environment
Environmental Chemistry
Environmental Health
Environmental regulations
Heavy metals
Hydrometallurgy
Iron silicates
Leaching
Manganese
Materials recovery
Metals - analysis
Nuclear reactions
Oxides
Pyrolusite
Raw materials
Reaction kinetics
Research Article
Silicon Dioxide
Slag
Sulfuric acid
Waste Water Technology
Water Management
Water Pollution Control
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Summary:With the shortage of high-quality raw materials and increasingly strict environmental regulations, the recovery of metals from copper slag and pyrolusite has become a research hotspot. A novel method for simultaneously extracting Mn and Fe from pyrolusite and copper slag has been proposed. Under the optimal conditions (Copper slag / Pyrolusite = 2, H 2 SO 4  = 2 M, liquid—solid ratio = 10, T = 90 ℃, holding time = 60 min), the leaching efficiencies of Mn and Fe can reach 98.28% and 99.04%, respectively. In addition, the treated residue containing 60.04 wt% SiO 2 can be used as a raw building material. Through chemical kinetics and mineralogical transformation analyses, Fe 2 SiO 4 in copper slag decomposes to release Fe 2+ , which can reduce and leach Mn from pyrolusite. The unreacted shrinkage nuclear reaction model under the control of the surface chemical reaction is the most suitable model to describe the process, and when the apparent activation energy is 35.50 kJ/mol, the apparent rate equation is: 1 - 1 - × 1 / 3 = 979.65 CS / Pyrolusite 2.6072 H 4 SO 4 1.3143 L / S 0.5649 e xp - 35.50 / RT Graphical Abstract
ISSN:1614-7499
0944-1344
1614-7499
DOI:10.1007/s11356-023-31157-5