Safely crush stibnite and antimony ore

Controlled ore processing with the jaw crusher for laboratory, pilot plant and process development

Stibnite is the most important ore mineral for antimony extraction. When crushing antimony-bearing ores, both the mineralogical properties and the potential release of hazardous dusts must be considered. A jaw crusher is suitable as a robust first process stage to reduce coarse, brittle ore pieces to a defined feed size for screening, sample division, fine grinding, or analysis. Crucial factors include a closed material path, effective dust capture, low-contamination cleaning, and a hazard assessment tailored to the actual ore matrix.

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The goal of stibnite comminution

The comminution of stibnite and other antimony ores serves the controlled extraction and processing of antimony-containing mineral phases. Depending on the objective, the material is prepared for mineralogical investigations, chemical analyses, digestion and separation tests, or further metallurgical processing. The focus is on a reproducible particle size, representative samples, and the reliable containment of antimony-containing dust.

Material data on stibnite and antimony ore

Stibnite is antimony trisulfide with the formula Sb₂S₃ and the most important antimony ore mineral. The mineral is relatively soft, but can be embedded in hard and abrasive gangue. Therefore, the entire ore structure, any accompanying contaminants, and dust emissions must be considered during crushing.

Property	Typical value / description
Material name	Stibnit
Alternative names	Antimonite, grey antimony sulfide, antimony sulfide
English designation	Stibnite
Chemical formula	Sb2S3
Mineral class	sulfide mineral
Significance	most important ore mineral for antimony
Theoretical antimony content	approx. 71,7 wt% in pure Sb2S3
crystal system	orthorhombic
Color	lead grey to dark grey
shine	metallic
Mohs hardness	approx. 2
density	approx. 4,5-4,7 g/cm³
Splitability	completely in one direction
Material behavior	soft, brittle to easily cut
Typical vein minerals	Quartz, pyrite, barite, calcite and other sulfide minerals
Abrasiveness	strongly dependent on gait type, especially increased with quartz content
Health relevance	Beware of antimony-containing dust and possible other heavy metal contaminants.
Process relevance	Closed material handling, dust collection and representative sample division are required.

Typical process for stibnite comminution

The process chain ranges from material testing and closed feeding through comminution in the jaw crusher to sieving, homogenization, representative sample division and optional fine grinding.

Process step	Objective	Typical machine / method	Typical result
material testing	Mineralogy, moisture, load size and accompanying pollutants determine	Sampling, XRF, XRD, chemical analysis	defined process and protection requirements
Closed material task	Limit dust release and material loss	Encapsulated feed hopper with extraction	controlled feeding
Pre-shredding	reduce coarse ore pieces	Jaw crushers	defined discharge particle size in the millimeter range
Classification	Separate target grain from overgrain	screening machine	defined grain fraction
Oversize grain recirculation	break down unwanted coarse fraction	Return to jaw crusher	more uniform maximum grain size
Homogenization	Balance the distribution of stibnite and vein minerals	closed mixer or controlled homogenization	more comparable sample material
Sample division	generate representative subsamples	Rotary sample divider or riffle divider	reproducible laboratory sample
Optional fine grinding	Establish analytical fineness	disc mill, disc mill or ball mill	fine analytical powder
Dust control	Limit exposure and contamination	Encapsulation, negative pressure, suitable filtration	clean and controlled work area

Typical process parameters for stibnit

Important parameters include feed size, crushing gap, discharge particle size, gangue, moisture, abrasiveness, dust control and the subsequent analysis or separation process.

Parameter	Typical area / Note
Source material	lumpy stibnite- or antimony-bearing ore
Feed size jaw crusher	Device-dependent, typically a few centimeters to several hundred millimeters
Discharge size jaw crusher	Dependent on the device and material, typically approx. 0,5-6 mm for laboratory and pilot devices.
Breaking gap	adapt to target grain size and ore structure
throughput	Highly dependent on equipment and material, ranging from batch operation to several tons per hour
Humidity	Determine before process selection, as it influences dust behavior and material flow
Abrasiveness	predominantly dependent on quartz and other vein minerals
Target particle size for sieving or separation tests	Define on a trial-dependent basis
Target particle size for analysis	Depending on the analysis, additional fine grinding may be required.
Contamination control	Adapt crushing jaw and grinding material to the analytical target
Dust extraction	closed feed, encapsulated discharge and local extraction
Cleaning	suitable industrial vacuum cleaner or validated wet cleaning process
Workplace exposure	Check according to applicable limit values and operational risk assessment
Analytics	Sb content, accompanying elements, XRF, XRD, PSD and moisture

Variants of stibnite processing

Jaw crushers for coarse crushing

The preferred first stage for coarse, lumpy, and brittle antimony ores. The jaw crusher produces a defined feed particle size for further processing.

Jaw crusher with screening circuit

Suitable when a defined upper particle size is required. Oversized material is returned to the crusher in a controlled manner.

Two-stage sample preparation

For analytical powders, coarse grinding is followed by fine milling. This combination improves reproducibility and process control.

Our machines for stibnite processing

For stibnite and antimony ores, jaw crushers, screening technology, an optional fine mill, and rotary sample dividers are particularly recommended, depending on the feed size, gangue type, target fraction, and analytical purpose. All dust-generating process stages must be integrated into a suitable protection and extraction system.

Machine:
More to Jaw crushers

Cost:
Price jaw crusher

Machine:
More about disc vibratory mills

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Price disc mill

Machine:
More about rotary sample dividers

Cost:
Price of rotary sample divider

Machine:
More about riffle dividers

Cost:
Price Riffelsplitter

Technical questions regarding stibnite and antimony ore processing

Use our AI for questions about jaw crushers, crushing gap, target grain size, dust protection, sample splitting and analytical sample preparation of antimony-containing ores.

FAQ on the crushing of stibnite

Stibnite is antimony trisulfide with the formula Sb₂S₃ and is the most important ore mineral for the extraction of antimony.

Coarse pieces of stibnite and antimony ore are first reduced in a controlled manner in a jaw crusher. Depending on the intended use, this is followed by sieving, sample division, and fine grinding.

A jaw crusher is suitable for the first crushing stage. It processes coarse, brittle pieces of ore and produces a defined feed particle size for further processing steps.

Stibnite contains antimony. Especially during grinding, antimony-containing dust must be treated as a health hazard and controlled by appropriate technical protective measures.

Depending on the device, material, and settings, discharge sizes from the lower millimeter range to several millimeters are possible. Additional fine grinding is required for analytical powders.

A closed material flow system limits the release of antimony-containing dusts, reduces material losses and facilitates controlled cleaning.

Stibnite and vein minerals have different densities and grain sizes. Homogenization and sample division help to produce representative and reproducible analytical samples.

Antimony ores can contain other sulfides as well as mineral phases containing arsenic, lead, or mercury. Therefore, the safety concept must be based on the analysis of the specific ore.

Ing. Klaus Ebenauer