Talc beneficiation production line and process

Talc beneficiation production line and process flow

The following is a complete process flow solution for talc ore beneficiation, combining core processes such as flotation, magnetic separation, and supporting talc ore equipment selection and key control points for talc ore containing quartz, feldspar, calcite, dolomite, ilmenite, and iron minerals (e.g., rhodochrosite, pyrite):

I. Talc ore beneficiation process flow

1. Crushing and grinding

• Coarse crushing: Jaw crusher (to 50-100mm).

• Fine crushing: cone crusher/impact crusher (to 10-20mm).

• Grinding: ball mill + spiral classifier (or hydrocyclone), grinding to -200 mesh accounted for more than 80%, release talc monomer dissociation.

2. Flotation process (core)

Application: Separate talc from quartz, feldspar, calcite and other vein minerals.

• Pharmacy system:

  • Capture agent: kerosene (50-100g/t) or diesel oil.

  • Foaming agent: MIBC (methyl isobutyl methanol, 10-30g/t), the foam is brittle and easy to dewater.

• Process:

  • 1 time roughing: rapid flotation of talc rough concentrate.

  • 1-2 sweeping: recover the residual talc in the tailings.

  • 3-4 times of concentrating: gradually improve the grade of concentrate (e.g. SiO₂ content ≤ 2%, whiteness ≥ 90%).

3. Iron removal by magnetic separation (key purification)

Applicable: Removal of magnetic impurities such as rhodochrosite, pyrite, tremolite, etc.

• High gradient magnetic separator (wet type): background magnetic field strength ≥1.2T, iron content reduced from 4-5% to <1%.

• Multi-stage magnetic separation: roughing → sweeping to ensure adequate removal of iron minerals.

4. Dewatering and drying

• Concentration: High-efficiency thickener (underflow concentration ≥60%).

• Filtration: Plate and frame filter press or ceramic filter (cake moisture ≤15%).

• Drying (optional): rotary dryer (low temperature drying when whiteness is sensitive).

Talc production line equipment supporting program

Third, process advantages and key control

1. Whiteness protection:

   • Priority flotation to reduce over-grinding, magnetic separation to remove iron in depth to avoid high temperature oxidation.

   • Adopt ceramic filter to reduce iron pollution.

2. Energy consumption optimization:

   • More crushing and less grinding, short flotation process (no need for complex chemicals), magnetic separation instead of electric separation.

3. Tailings treatment:

   • Flotation tailings can recover quartz/feldspar, magnetic separation tailings need to be neutralized (when containing sulfur).

Typical indicators

V. Optional Process Expansion

• Optical sorting: Pre-throwing waste (large chunks of veinstone), reducing milling costs.

• Iron removal by acid leaching (deep purification): oxalic acid or citric acid treatment, Fe₂O₃ can be reduced to less than 0.3%.

Talc beneficiation production line and process solution is based on "flotation-based + magnetic separation to remove iron" as the core, taking into account the whiteness and grade, suitable for the production of high-purity talc concentrate (cosmetics, paints grade). If the iron content of the ore is very high (>5%), we can add a strong magnetic - flotation combined process, giving priority to magnetic separation tailing and then flotation purification.