Thallium: Extraction
Common in rock, yet almost impossible to recover
What this tab covers How it is mined, drilled or grown, and processed into a tradeable form: the main methods compared, their unit economics, by-products, and the companies that do this work globally and in India.Thallium is not scarce in the crust, at about 0.7 part per million. Most of it is dispersed in potassium minerals in clays, granites and soils, where it cannot be recovered. Commercial thallium comes from trace amounts in copper, lead and zinc sulfide ores. When those concentrates are roasted, thallium volatilises and collects in flue dust. It is then leached and refined. About 95% of supply is a companion of zinc and copper. No thallium mine exists for its own sake.
Thallium is recovered commercially in only a few countries, all as a by-product of base-metal smelting. When zinc, lead and copper sulphide ores are roasted, thallium goes into the flue dust, from which it is leached and purified. Most producers withhold data, so world output is known only roughly: about 10 tonnes in 2023, mainly from China, Kazakhstan and Russia (USGS). A separate route makes the medical isotope thallium-201 in cyclotrons. Because thallium is highly toxic, every step is tightly regulated.
Methods compared
| Method | Share of supply | Typical scale | Recovery / efficiency | By-products | Unit cost |
|---|---|---|---|---|---|
| Recovery from base-metal smelter flue dust | essentially all primary supply | world about 10,000 kg a year (2023) | not published | thallium is the by-product; zinc, lead, copper are main products | not published |
| Cyclotron production of thallium-201 | all medical Tl-201 | not published | not published | none of note | not published |
How each method works
Recovery from base-metal smelter flue dustDust from roasting zinc, lead and copper concentrates is leached in acid or water. Thallium is separated by precipitation, solvent extraction or cementation and refined to metal or salts.
Turns a toxic emission into product, but output is tiny and data are withheld.
USGS MCS 2026, Thallium Cyclotron production of thallium-201Enriched thallium targets are bombarded with protons in a cyclotron to make lead-201, which decays to thallium-201. The isotope is purified and shipped quickly because its half-life is about three days.
Reliable isotope source, but demand is shrinking as Tc-99m replaces it.
USGS MCS 2026 (medical use); production route described in general nuclear-medicine practice Unit economics are indicative ranges from the sources named; costs vary widely by deposit, region and year.By-product supply
Companionality is about 95%: thallium comes from zinc and copper smelting (Nassar et al. 2015). Supply depends on whether smelters install recovery, not on thallium prices. Resources are adequate (USGS) because thallium is present in many sulphide ores, but recovering it is only worthwhile at a few plants, and toxicity rules discourage new entrants.
Share produced as a by-product
About 95% of primary supply comes as a by-product of zinc and copper (Nassar, Graedel & Harper 2015, approximate).Who does it: global
| Company | Country | Activity | Volume | Year | Source |
|---|---|---|---|---|---|
| Chinese zinc and lead smelters China is a leading producer; producer names and volumes not published. | China | primary thallium from flue dust | not published | 2023 | USGS MCS 2026 |
| Kazakh base-metal smelters Leading producer country; company names and volumes not published. | Kazakhstan | primary thallium from flue dust | not published | 2023 | USGS MCS 2026 |
| Russian base-metal smelters Leading producer country; company names and volumes not published. | Russia | primary thallium from flue dust | not published | 2023 | USGS MCS 2026 |
Who does it: India
India has no reported thallium production (USGS 2026 lists none), and no Indian zinc or lead smelter reports thallium recovery. India imports small amounts of thallium compounds and radiopharmaceuticals; thallium is not on India's 2023 critical list.