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Tungsten-nickel-iron alloy scrap secondary resource

Discarded tungsten-nickel-iron heavy-alloy components, represented by decommissioned projectile cores identified as VNZh in the Baranov study. This manufactured secondary resource is distinct from elemental tungsten, cemented tungsten carbide scrap, mining tailings and grinding-fluid sludge. The reported feed composition describes the tested material, not every VNZh grade or tungsten-alloy waste. No criticality designation, standardized product specification or industrial deployment is inferred.

Microbial & Biochemical Mechanisms (1)

Ferric-assisted disintegration and separation of tungsten-bearing powder

recovery

The study describes mechanical fragment collisions and ferric-sulfate attack on the nickel-iron matrix, followed by filtration of a fine tungsten-bearing solid. The accepted mechanism here is the chemical and mechanical separation. The source also discusses bacteria and biological regeneration of spent solution, without establishing their experimental contribution. The nonmicrobial classification does not assert that the workflow was sterile or exclude possible microbial involvement. Neither complete tungsten recovery nor phase-pure metal powder is established.

Experimental Context & Analytical Limits:
Pages 43-44 identify discarded VNZh cores containing reported 90.06 percent W, 6 percent Ni and 3.94 percent Fe. A separate reactor processed VK8 cutting inserts reported as 92 percent WC and 8 percent Co; the two feeds are not one mixed arm. The ferric-sulfate solution and modified disintegrator without added grinding bodies are described, but ferric concentration, pH, processing temperature, duration, solid-to-liquid loading, rotation rate, vessel volume and replicated processing runs are not supplied. Subsequent hot pressing and microscopy prepare analytical specimens; their settings are not processing conditions for the scrap-disintegration experiment.
Curated Evidence Points:
Figures 1-4 and pp. 43-44 identify the apparatus, starting scrap, processing slurry, separated powder and spent liquid. The authors assign the matrix-removal description and Figure 4 products to the VNZh feed, including a green nickel-containing filtrate. This supports the reported separation workflow, not a measured dissolved-nickel concentration, isolated nickel product or whole-feed mass balance. Color alone does not identify every dissolved species.
Page 44 reports 99.95 percent tungsten in the powder from an analysis by the Ukrgeolbudm testing laboratory. No assay method, analytical denominator, impurity table, uncertainty, product mass or phase-characterization trace accompanies that assertion. It is retained as an incompletely documented composition claim, not adopted as verified metal purity or tungsten recovery yield.
Figures 5-9 concern scanning tunneling microscopy of two compacted tungsten-powder specimens: one cold pressed and one subsequently hot pressed at 500 degrees C under an unspecified inert gas. The text reports a 10-ton pressing load and three-minute hold. Filtering and surface-object segmentation precede the displayed size distributions. These are pressed-surface morphological observations, not direct size measurements of the loose recovered powder or a measured yield of nanoparticles.
The abstract gives a 7 nm to 1 micrometer range and 90 percent below 400 nm, whereas the body reports 7 nm to 3 micrometers. The conclusion describes principal ranges of 200-500 nm for the hot-pressed specimen and 100-300 nm for the cold-pressed specimen. The authors suggest recrystallization as an explanation for the difference. These inconsistent and preparation-dependent summaries are preserved without selecting a single powder distribution or deriving a new percentage from Figure 9. The stated target scanning resolution of 150 angstroms and image noise/filtering leave the accuracy of the reported 7 nm lower bound unverified.
Page 43 describes the ferric solution as a habitat for source-named Thiobacillus ferrooxidans, and p. 44 proposes restoration of spent solution's oxidizing capacity using thionic bacteria. No strain, authenticated stock, inoculum, culture abundance, iron-oxidation series or tested regeneration cycle is supplied. No matched sterile ferric, acid-only or mechanical-only comparison isolates biological activity. This is insufficient to curate a demonstrated microbial mechanism or transfer the later Chaika hardmetal study's organism, conditions and outcomes into this experiment.
The VK8 comparator receives a brief statement that cobalt chemistry is analogous to nickel chemistry. The VNZh tungsten-content claim and compacted-specimen images are not separately demonstrated VK8 results and are not assigned to cemented tungsten carbide scrap. No measured cost, throughput, energy comparison or industrial operation supports the paper's broader efficiency and application claims.

Sources & References

  1. baranov2011-alloy-scrap: Baranov G.A., Gavrish M.V. and Sanikovich D.D. (2011), Production of nanosized powders during processing of waste based on tungsten-containing alloys and investigation of their granulometric composition (translated title). Visnyk NTUU KPI, Mechanical Engineering, No. 63, pp. 42-46. Complete Russian original, Figures 1-9, and official repository item 123456789/6650. The repository confirms issue year 2011 and accession date 2014-02-11; these are distinct dates. No DOI is asserted.
    https://ela.kpi.ua/handle/123456789/6650 (accessed 2026-10-12)

Curation History

Timestamp Curator Action Summary
2026-10-12T03:18:37Z Codex (GPT-6; codex) CREATE Created the distinct W-Ni-Fe alloy scrap resource from the complete 2011 primary article and verified repository identity. Separated demonstrated chemical/mechanical processing from proposed biological regeneration, retained purity and pressed-surface size limitations, and kept the separately processed VK8 comparator outside this owner.

Record source: data/records/tungsten-nickel-iron-alloy-scrap.yaml