PDF

Waste-on-Waste Roasting of Copper Slag with Flotation Tailings for Selective Recovery of Cu, Ni, and Co

Bobur Gayratov, Bekhzod Gayratov

2026Englishcopper slagflotation tailingssulfation roastingmetal recoverysecondary resourcesleaching

Abstract

Language:

Copper smelter slag represents a significant secondary resource of critical metals, while flotation tailings serve as an abundant sulfur-bearing waste stream. This study investigated a waste-on-waste sulfation roasting approach for the selective recovery of Cu, Ni, and Co from fayalite copper smelter slag using flotation tailings as an in situ sulfur source and sodium metabisulfite (SMBS, Na2S2O5) as a sulfation promoter. The effects of roasting temperature, roasting time, slag-to-tailings ratio, SMBS dosage, and water-leaching conditions were systematically evaluated. Under the optimum conditions of a slag-to-tailings ratio of 1:1, roasting at 600 ◦C for 4 h with 30 wt% SMBS addition, followed by water leaching at 25 ◦C for 2 h, extraction efficiencies of 85.5% Cu, 81.6% Ni, and 87.1% Co were achieved, while Fe dissolution remained below 5%, demonstrating high selectivity. Phase and microstructural analyses by XRD, FTIR, SEM, and TG–DTA revealed that pyrite oxidation generated sulfur oxides required for metal sulfation, whereas SMBS promoted sulfur release and sulfate stabilization, enhancing sulfation efficiency. Thermodynamic analysis further confirmed the feasibility of sulfide oxidation and sulfate formation within the investigated temperature range. The results demonstrate that the synergistic use of tailings and SMBS enables efficient low-temperature sulfation.

Download

Cite This Work

@article{26ac83d1-a3f9-45d1-adce-1b2fd69393fd,
  title={Waste-on-Waste Roasting of Copper Slag with Flotation Tailings for Selective Recovery of Cu, Ni, and Co},
  author={Bobur Gayratov and Bekhzod Gayratov},
  year={2026},
  language={English}
}
TY  - JOUR
TI  - Waste-on-Waste Roasting of Copper Slag with Flotation Tailings for Selective Recovery of Cu, Ni, and Co
AU  - Bobur Gayratov
AU  - Bekhzod Gayratov
PY  - 2026
LA  - English
ER  -

Similar Items

Summary of Pretreatment of Waste Lithium-Ion Batteries and Recycling of Valuable Metal Materials: A Review

Linye Li, Yuzhang Li

The recycling of used lithium-ion batteries has become a growing concern. As a large number of rare metal elements are present in waste lithium-ion ba

2024EnglishPDF

An Overview of the Sustainable Recycling Processes Used for Lithium-Ion Batteries

Daniele Marchese, Chiara Giosuè

Lithium-ion batteries (LIBs) can play a crucial role in the decarbonization process that is being tackled worldwide; millions of electric vehicles are

2024EnglishPDF

Recovery of precious metals from e waste

Printed circuit boards (PCBs) from electronic gadgets at the end of their useful life period are currently being dumped in landfills or incinerated, c

2026enPDF

Study on the influence of various factors in the hydrometallurgical processing of waste printed circuit boards for copper and gold recovery

Ionela Birloaga, Ida De Michelis, Francesco Ferella, Mihai Buzatu, Francesco Vegliò

This study investigates the hydrometallurgical recovery of copper and gold from waste printed circuit boards (WPCBs) using a sequential oxidative leac

2013enPDF

FEASIBILITY STUDY FOR RECOVERING PRECIOUS METALS FROM E-WASTE

ROPAFADZO JAMAKANGA

Printed circuit boards (PCBs) from electronic gadgets at the end of their useful life period are currently being dumped in landfills or incinerated, c

2014enPDF

Recovery of valuable metals from mining and mineral processing waste

Roger Rumbu

2025enPDF