Antimony is mined mainly from ore containing stibnite, then separated and converted into metal through a route chosen for the ore’s mineral content and grade. Commonly described routes include concentrating sulfide ore by gravity separation or flotation, roasting it to an oxide and reducing that oxide, smelting, liquation followed by conversion, and—in some cases—leaching and electrowinning. There is no single process used for every deposit.
What ore is antimony found in?
The most common antimony ore mineral is stibnite (Sb₂S₃), a sulfide. More than 100 other minerals also contain antimony, according to the U.S. Geological Survey’s 2017 antimony report. Depending on the deposit, antimony may be the main commodity or may be recovered as a byproduct of gold, silver, or other metal mining. The USGS 2021 overview describes both kinds of deposits.
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Those differences matter because the mineral carrying the antimony, its concentration, and the other minerals in the ore influence how it can be separated and converted. The available sources support a description of the main processing options, not a universal mining method or a mine-by-mine account of current operations.
How does antimony ore become metal?
The broad sequence is to mine antimony-bearing material, prepare and concentrate it where necessary, extract antimony from the resulting feed, and refine crude metal if the product requires it. The U.S. EPA’s 1998 technical background describes several established processing routes. Its account is useful for understanding the alternatives, but its generalized grade-based descriptions should not be read as a rule for how a modern plant must be designed.
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- Mine the deposit. Extract antimony-bearing ore, either from a deposit where antimony is the principal product or as part of another metal operation.
- Prepare the ore. Crush and grind material when needed so that antimony minerals can be separated from waste minerals, known as gangue.
- Concentrate the antimony minerals. For sulfide ores, gravity separation and flotation are among the methods described for upgrading the feed.
- Choose an extraction route. The feed’s mineral composition and grade help determine whether processing proceeds through an oxide, a smelting step, a sulfide intermediate, or a solution.
- Recover and, if needed, refine metal. Extraction produces antimony-bearing metal or an intermediate that can be converted to metal; additional refining may remove impurities.
- Manage residues and emissions. Tailings, waste rock, slag, dust, and water streams require controls suited to the site and process.
For sulfide ore that is not shipped at a suitable grade, preparation and beneficiation can separate antimony minerals from gangue; complex ores may also contain associated minerals worth recovering. Gravity separation uses differences in mineral density, while flotation separates minerals according to how they behave at the surface in a prepared slurry. The EPA’s 1998 technical background documents gravity and flotation routes for sulfide ores.
Which processing routes can produce antimony metal?
The routes differ in what happens to the antimony-bearing feed before metal is obtained. Some first make antimony oxide; others separate a molten sulfide or produce metal during smelting. The EPA account also describes a leaching-and-electrowinning alternative. It does not establish how prevalent each route is in current global production, nor does it provide comparable current plant data for ranking their cost, energy use, or recovery performance.
| Route | What happens | Role of feed | What to understand |
|---|---|---|---|
| Roasting and oxide reduction | Roasting drives off sulfur and volatilizes antimony as oxide. The oxide is captured in flues or dust-collection equipment, then reduced to metal. | Described for lower-grade sulfide material in the EPA’s generalized historical account. | It makes an oxide intermediate before metal; capture of antimony-bearing dust and control of sulfur-bearing gases are important process considerations. |
| Blast-furnace smelting | Smelting separates antimony-bearing metal from slag. | Described for intermediate-grade feeds in the EPA’s generalized historical account. | It is a direct smelting route, but the source does not provide current, comparable plant performance figures. |
| Liquation and conversion | Heating separates molten antimony sulfide from gangue. The sulfide may be sold as a product or converted to metal, including by iron precipitation or oxide reduction. | Liquation is described for higher-grade sulfide ores in the historical account. | Liquation produces a sulfide intermediate, so it is not by itself always the final step to metal. |
| Leaching and electrowinning | Leaching transfers antimony into solution; electrowinning deposits it at a cathode. | Presented as an alternative route; the source does not establish a grade band or current prevalence. | The method depends on a solution-based processing stage. The available account does not support a cost or efficiency comparison with the other routes. |
Why does the route depend on the ore?
A process must work with the form in which antimony occurs and separate it from the rest of the feed. A sulfide concentrate, an oxide intermediate, and a solution call for different downstream steps. Grade, associated minerals, desired product, recovery requirements, and impurity-removal needs also shape the choice. The historical EPA description links certain routes to broad feed grades, but those examples are not universal modern design thresholds.
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Is antimony made by smelting?
Sometimes. Blast-furnace smelting is one documented route, but it is not the only one. Roasting followed by oxide reduction, liquation followed by conversion, and leaching followed by electrowinning are also described in the EPA technical account. Whether a particular operation uses one of these methods depends on its feed and process design.
What happens to antimony after extraction?
The extraction stage may produce crude metal rather than a finished, purified product. The EPA account notes that crude metal can undergo further refining to remove impurities. The exact refining steps depend on the material and product requirements; the cited sources do not establish one universal refining sequence or a single product specification.
When an intermediate is produced instead of metal, it may be converted in a subsequent step. For example, antimony sulfide separated by liquation can be converted through iron precipitation or oxide reduction. Roasting-and-reduction routes first capture oxide, while electrowinning deposits antimony from solution at a cathode. These are different process paths, not stages that every ore passes through.
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What environmental controls matter?
Mining and processing leave material that may contain antimony: waste rock, tailings, slag, and dust, as well as process water and other water streams. Antimony-bearing stibnite and sulfosalts can release antimony into surface water and groundwater and contribute to contamination of soils, plants, and river sediments. How much moves, and where it accumulates, depends on local mineralogical and geochemical conditions.
A 2023 USGS review of antimony in mine wastes describes cases where iron oxyhydroxides limit antimony mobility, as well as cases where secondary antimony minerals influence water concentrations. Antimony therefore should not simply be assumed to behave like arsenic in environmental assessment or remediation. Site-specific studies of minerals, water, and waste are important to understand the risks and select controls.
Process controls also need to account for the route used. Roasting involves sulfur-bearing gases and antimony-bearing oxide that must be captured; smelting produces slag; and beneficiation and leaching involve material and water streams that must be managed. The cited sources do not provide a single set of controls that applies to every mine or plant.
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Are there rules for antimony smelting?
Environmental requirements vary by jurisdiction. China’s Ministry of Ecology and Environment lists HJ 938—2017, a technical specification concerning pollutant-discharge permits for non-ferrous-metal antimony smelting. It took effect on 2017-12-27, according to the ministry’s standard page. This is a Chinese regulatory reference, not a global standard; requirements elsewhere must be checked with the relevant authorities.
What do production figures say about where antimony is mined?
Production shares should be dated rather than treated as a current ranking. A USGS chapter page published in 2021 reports that, in 2018, about 61% of world antimony production was mined in China, followed by Russia at 20% and Tajikistan at 10%. These are historical shares for 2018, not current production figures.
The USGS’s 2017 report abstract gives a different kind of number: it states that global atmospheric emissions of antimony “average 6,100 metric tons per year.” That is the figure and framing reported in that publication; it should not be presented as a current measured emissions rate without newer confirmation. The cited sources do not establish a date-matched current global production statistic suitable for a present-tense total.
What determines the best process for a particular deposit?
There is no route that can be called best for every ore on the evidence available. Comparing options requires information specific to the deposit and plant, including:
- Mineralogy and grade: whether antimony occurs mainly as stibnite or other minerals, and how concentrated it is.
- Feed form: whether the material is sulfide, oxide, or another type of feed, and whether it can be upgraded by gravity separation or flotation.
- Target product: whether the operation is aiming for a concentrate, oxide, sulfide intermediate, or metal.
- Recovery and purity needs: how much antimony must be recovered and what impurities need to be removed.
- Process demands: energy and reagents required, along with the practical needs for handling gases, dust, water, tailings, and slag.
The sources describe alternatives, but do not supply comparable current plant performance data. They therefore do not support ranking these routes by efficiency or cost.
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