Complete Ilmenite Beneficiation Process: Gravity Separation + Magnetic Separation + Flotation

Ilmenite is a key raw material for producing titanium dioxide (TiO₂) and titanium alloys, and is widely used in the chemical, aerospace, and other industrial sectors. In mineral processing engineering, ilmenite is typically separated and purified through a combination of gravity separation, magnetic separation, flotation, and refining processes.

This article takes a large‑scale ilmenite project as an example to introduce the complete beneficiation process, key equipment, and process design strategy.

What is Ilmenite Beneficiation?

Ilmenite beneficiation refers to the process of separating ilmenite from gangue minerals using physical or chemical methods.

The main objectives include:

• Increasing TiO₂ grade

• Removing impurity minerals

• Improving resource utilization

Ilmenite Beneficiation Process

Based on the beneficiation test reports and site conditions, and after repeated comparisons, the Xinhai Mining Design Institute determined the final process flow as:

Crushing & Grinding → Dry Magnetic Separation (Pre‑concentration) → Gravity Separation + Magnetic Separation + Flotation Purification

Detailed Process Flow:

1. Crushing + HPGR + Ball Milling

Function:

Reduce the material size to below -1 mm.

Equipment:

• Crusher

• High Pressure Grinding Rolls (HPGR)

• Ball mill

Advantages:

• Lower energy consumption per unit

• Higher throughput capacity

• Improved equipment operating efficiency

2. Three‑Stage Dry Magnetic Separation

Function:

Recover rough ilmenite concentrate and reject gangue early.

Process:

• First stage: weak magnetic separation (1800 Oe) to recover iron rough concentrate

• Second & third stages: strong magnetic separation (1.0 T) to recover ilmenite rough concentrate

• Overall, the tailings rejection rate can reach up to 51%

Advantages:

• Early removal of a large amount of waste rock

• Reduced grinding load and energy consumption

• Lower tailings storage pressure, more environmentally friendly

3. Gravity Separation (Key Step for Heavy Minerals)

Function:

Pre‑enrich heavy minerals such as ilmenite based on density differences.

Equipment:

• Spiral Chute

• Shaking Table

Advantages:

• Effective for coarse and medium‑grained ilmenite

• No chemicals required, clean and low‑cost

• High enrichment ratio, stable performance

• Reduces the load for subsequent magnetic and flotation stages

4. Combined Separation: Weak Magnetic + Strong Magnetic + Ultra‑High Concentration Flotation

Function:

Further purify iron and ilmenite concentrates.

Process:

• Dry concentrate is combined and ground to 85% passing -200 mesh

• Weak magnetic separation (1000 Oe) produces an iron concentrate with TFe ≥ 59.09%

• Magnetic tailings are processed by strong magnetic separation (8500 Oe)

• Followed by 50% ultra‑high concentration flotation, producing a qualified ilmenite concentrate with TiO₂ ≥ 47.19%

Advantages:

• Lower reagent consumption

• Higher separation efficiency

• Stable and reliable indexes

  
  

5. Regrinding of Ilmenite Rough Concentrate (Vertical Mill)

Function:

Fine grinding to fully liberate ilmenite minerals.

Equipment:

Vertical grinding mill

Advantages:

• Efficient fine grinding with minimal overgrinding

• Small footprint, low noise, low vibration

• Easy installation and improved working environment

• Enhances the final concentrate grade

How to Select an Ilmenite Beneficiation Process

Choosing the appropriate beneficiation process depends on:

• Ore type

• Particle size characteristics

• Project scale

• Cost budge

FAQ

Q1: What are the main methods for ilmenite beneficiation?

A: A combination of gravity separation, magnetic separation, and flotation is commonly used.

Q2: Why is gravity separation important for ilmenite?

A: Ilmenite has a high density, so gravity separation can pre‑enrich heavy minerals efficiently and cost‑effectively.

Q3: Why is magnetic separation necessary?

A: Because ilmenite has weak magnetic properties, it can be used to separate it from non‑magnetic gangue.

Conclusion

In summary, ilmenite beneficiation typically adopts a combined process of gravity separation + magnetic separation + flotation + fine grinding & regrinding.

The specific process must be customized according to ore characteristics to achieve optimal recovery, grade, and economic efficiency.

If you require a customized ilmenite beneficiation solution, please contact us for professional EPC services.