Assessment of industrial by-products as amendments to stabilize antimony mine wastes

The spread of antimony from mine wastes to the environment represents a matter of great concern due to its adverse effects on impacted ecosystems. There is an urgent need for developing and adopting sustainable and inexpensive measures to deal with this type of wastes. In this study the Sb leaching...

Full description

Saved in:
Bibliographic Details
Published in:Journal of environmental management 2023-10, Vol.343, p.118218-118218, Article 118218
Main Authors: Álvarez-Ayuso, E., Murciego, A.
Format: Article
Language:English
Subjects:
Aluminum salt slag treatment by-product
Antimony
Deferrisation sludge
Ecosystem
Hazardous Waste
Leaching
Mine wastes
Stabilization
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The spread of antimony from mine wastes to the environment represents a matter of great concern due to its adverse effects on impacted ecosystems. There is an urgent need for developing and adopting sustainable and inexpensive measures to deal with this type of wastes. In this study the Sb leaching behavior of mine waste rocks and mine tailings derived from the exploitation of Sb ore deposits was characterized using standard batch leaching tests (TCLP and EN-12457-4) and column leaching essays. Accordingly, these mine wastes were characterized as toxic (>0.6 mg Sb L−1) and not acceptable at hazardous waste landfills (>5 mg Sb kg−1), showing also an ongoing Sb release under prolonged leaching conditions. Two industrial by-products were evaluated as amendments to stabilize them, namely deferrisation sludge (DFS) and a by-product derived from the treatment of aluminum salt slags (BP–Al). Mine wastes were amended with different doses (0–25%) of DFS or BP-Al and the performance of these treatments was evaluated employing also batch and column leaching procedures. The effectiveness of DFS to immobilize Sb was much higher than that exhibited by BP-Al. Thus, treatments with 25% BP-Al showed Sb immobilization levels of approximately 33–53%, whereas treatments with 5 and 25% DFS already attained Sb immobilization levels up to approximately 80–90 and 90–99%, respectively. Mine tailings amended with 5% DFS and mine waste rocks amended with 25% DFS decreased their leachable Sb contents below the limit for non-hazardous waste landfill acceptance (90%) in leachates from weat
ISSN:0301-4797
1095-8630
DOI:10.1016/j.jenvman.2023.118218