Chromite Ore Beneficiation Solution (Gravity + Magnetic Separation)

Stage 1: Crushing & Closed-Circuit Screening

Raw ore is primarily crushed by a Jaw Crusher. It is then fed into a Circular Vibrating Screen which classifies the material into two distinct streams: +5mm and -5mm. The oversized rock is finely crushed using a Roller Crusher (which minimizes dust generation and prevents over-pulverization) and returned to the screen, forming a closed-circuit loop.

Stage 2: Lumpy Chrome Recovery (Gravity)

The +5mm fraction is incredibly valuable. Instead of grinding it, it is sent directly to Mineral Jigs. The pulsating water action of the jig effectively recovers coarse, lumpy chromite concentrate immediately, maximizing your commercial revenue.

Stage 3: Fine Chrome Grinding & Gravity Scavenging

The -5mm fraction enters a Ball Mill operating in a closed circuit with a High-Frequency Screen. Once the material is ground down to -2mm, it is fed into an array of Spiral Chutes. The spirals act as high-capacity roughers, utilizing centrifugal and gravity forces to separate fine heavy chromite from lighter silica and waste rock.

Stage 4: Magnetic Purification (Boosting Cr/Fe Ratio)

Gravity separation recovers the chromite, but it also recovers heavy magnetic iron minerals that lower the commercial value of the product. The gravity concentrate is passed through a Medium-Intensity Magnetic Separator. This specialized equipment pulls out the residual iron impurities, deeply purifying the chromite and dramatically boosting the final Chromium-to-Iron (Cr/Fe) ratio.

• Processing Capacity: 15 to 100 t/h (Fully customizable based on mine life).
• Raw Ore Grade Intake: Designed to process low-to-medium grades (Cr₂O₃ 25% - 35%).
• Final Concentrate Grade: Cr₂O₃ ≥ 45%.
• Chromium-Iron Ratio: Cr/Fe ≥ 2.5 (Metallurgical Grade).
• Recovery Rate Advantage: The combined gravity-magnetic circuit yields a 3% to 5% higher total recovery rate compared to standard single-process plants.

Q1: Why is recovering "Lumpy Chrome" so important?

A: Smelters prefer coarse lumps of chromite (typically between 5mm and 50mm) for ferrochrome production because fine powders can blow out of the smelting furnaces. Lumpy chrome always sells at a massive premium over fine concentrates. Our flowsheet uses Jigs to instantly extract this +5mm material before the ball mill can destroy it.

Q2: Why use both Gravity and Magnetic separation?

A: Gravity separation (Jigs and Spirals) is the cheapest and most efficient way to discard light waste rock (like silica) and recover bulk heavy minerals. However, heavy iron-rich minerals often settle alongside the chromite. Because chromite is only weakly magnetic and iron is strongly magnetic, passing the gravity concentrate through a magnetic separator cleanly strips the iron away, solving the biggest problem in chrome mining: achieving a >2.5 Cr/Fe ratio.

End-to-End EPC Chrome Mining Solutions

GravityMineral provides comprehensive Turnkey EPC Solutions for your chrome mining project. From initial exploratory ore testing and custom plant engineering to equipment manufacturing and on-site commissioning, we ensure your plant hits its target Cr₂O₃ grades and Cr/Fe ratios.

Ready to upgrade your chromite? Contact our metallurgical engineers today for a customized flowsheet and project quotation.