Processing of WC–Co waste with selective extraction of Co3O4 by oxidative fusion in NaNO3 melt

Ilyos A. BOZOROV, AZIZ B. IBRAGIMOV, Odiljon Abdurakhmonov, Mastura Kh. ARIPOVA, Sherzod Abdurakhmonov

Kimyo va kimyo texnologiyasi · 2026-yil

Annotatsiya

The aim of this study was to develop and experimentally validate a selective method for producing high-purity cobalt oxide from WC–Co hard alloy waste using oxidative fusion in a sodium nitrate (NaNO3) melt, followed by combined aqueous and acidic purification of the solid residue. Cemented carbide scrap and waste containing 6–12 wt.% Co were used as feedstock, without prior grinding. It was found that, during heat treatment in the range of 650–900 °C, tungsten predominantly converts into soluble sodium tungstates, while cobalt concentrates in the solid residue as an oxide phase. Optimal process conditions, such as 850°C and a 10-min hold, were shown to provide the best combination of phase separation and cobalt recovery: the Co content in the solid product was approximately 94.08 wt.%, the W content was reduced to 1.14 wt.%, and the cobalt recovery rate in the target solid product reached ΣCo ≈ 97.3%. X-ray diffraction analysis revealed a predominance of the spinel phase Co3O4 with minor traces of WO3. TEM-EDS results confirmed the oxide nature of the product and indicated a high cobalt content with low levels of residual impurities. However, after washing with water, residual sodium remained in the product, requiring an additional desalination step. The use of a triple hot water rinse at 80 °C with ultrasonication followed by short-term treatment in 0.05 M HNO3 at 70 °C for 5 min ensures the effective removal of sodium-containing compounds: the Na content is reduced from 3.28 to 0.09 wt.%, and the final product contains 98.28 wt.% Co with a residual W content of 0.6 wt.%. The obtained results confirm that the proposed approach is technologically feasible, reagent-efficient, and promising for the processing of WC–Co waste with the return of cobalt as a valuable metallurgical raw material.

Maqola ma’lumotlari
MualliflarIlyos A. BOZOROV, AZIZ B. IBRAGIMOV, Odiljon Abdurakhmonov, Mastura Kh. ARIPOVA, Sherzod Abdurakhmonov
JurnalKimyo va kimyo texnologiyasi
NashriyotТошкент кимё-технология институти
ISSN1992-9498, 2181-1121
Nashr sanasi2026-06-23
Jild2026
Son2
TilIngliz
Ilmiy sohaKimyo
DOI10.70189/1992-9498.1723
Indeksga qo‘shilgan2026-09-02

DOI: 10.70189/1992-9498.1723 · Maqolaning asl sahifasi · PDF

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Iqtibos keltirish

APAIlyos A. BOZOROV, AZIZ B. IBRAGIMOV, Odiljon Abdurakhmonov, Mastura Kh. ARIPOVA, & Sherzod Abdurakhmonov (2026). PROCESSING OF WC–Co WASTE WITH SELECTIVE EXTRACTION OF Co3O4 BY OXIDATIVE FUSION IN NaNO3 MELT. Kimyo va kimyo texnologiyasi, 2026(2). https://doi.org/10.70189/1992-9498.1723
GOST (OAK)Ilyos A. BOZOROV va b. PROCESSING OF WC–Co WASTE WITH SELECTIVE EXTRACTION OF Co3O4 BY OXIDATIVE FUSION IN NaNO3 MELT // Kimyo va kimyo texnologiyasi. – 2026. – T. 2026, № 2. – DOI: 10.70189/1992-9498.1723.
MLAIlyos A. BOZOROV, AZIZ B. IBRAGIMOV, Odiljon Abdurakhmonov, Mastura Kh. ARIPOVA, and Sherzod Abdurakhmonov. “PROCESSING OF WC–Co WASTE WITH SELECTIVE EXTRACTION OF Co3O4 BY OXIDATIVE FUSION IN NaNO3 MELT.” Kimyo va kimyo texnologiyasi, 2026(2), 2026. https://doi.org/10.70189/1992-9498.1723
ChicagoIlyos A. BOZOROV, AZIZ B. IBRAGIMOV, Odiljon Abdurakhmonov, Mastura Kh. ARIPOVA, and Sherzod Abdurakhmonov. “PROCESSING OF WC–Co WASTE WITH SELECTIVE EXTRACTION OF Co3O4 BY OXIDATIVE FUSION IN NaNO3 MELT.” Kimyo va kimyo texnologiyasi, 2026(2) (2026). https://doi.org/10.70189/1992-9498.1723
HarvardIlyos A. BOZOROV, AZIZ B. IBRAGIMOV, Odiljon Abdurakhmonov, Mastura Kh. ARIPOVA, and Sherzod Abdurakhmonov (2026) ‘PROCESSING OF WC–Co WASTE WITH SELECTIVE EXTRACTION OF Co3O4 BY OXIDATIVE FUSION IN NaNO3 MELT’, Kimyo va kimyo texnologiyasi, 2026(2). https://doi.org/10.70189/1992-9498.1723
BibTeX
@article{ilyosabozorov2026,
  title = {PROCESSING OF WC–Co WASTE WITH SELECTIVE EXTRACTION OF Co3O4 BY OXIDATIVE FUSION IN NaNO3 MELT},
  author = {Ilyos A. BOZOROV and AZIZ B. IBRAGIMOV and Odiljon Abdurakhmonov and Mastura Kh. ARIPOVA and Sherzod Abdurakhmonov},
  journal = {Kimyo va kimyo texnologiyasi},
  year = {2026},
  volume = {2026},
  number = {2},
  doi = {10.70189/1992-9498.1723},
  url = {https://doi.org/10.70189/1992-9498.1723}
}

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