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Chromite Beneficiation Process

  • [Introduction]: The chromite beneficiation process is designed to address the specific characteristics of chromite—namely, its high density, weak-to-moderate magnetism, and highly variable grain size distribution. It employs a beneficiation flowsheet that relies primarily on gravity separation, supplemented by magnetic separation and flotation. Through carefully optimized crushing, grinding, and separation operations, the process achieves the effective separation of chromite from gangue minerals, thereby enhancing both the grade and recovery rate of the chromite concentrate. This process flowsheet is mature, reliable, and highly adaptable, making it widely utilized in the development and exploitation of chromite resources.
  • [Application]: Primary chromite ores; alluvial or eluvial chromite deposits; medium-to-low-grade chromite ores; and chromite ores with medium-to-coarse grain sizes.
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Chromite Beneficiation Flowsheet

In actual production, relying on a single beneficiation method rarely yields optimal economic and technical results; therefore, designing a rational, combined process flowsheet is the key to successful chromite beneficiation.

A typical combined flowsheet generally follows this sequence: “Crushing – Screening – Grinding – Classification – Gravity Separation (Jigging/Spirals) – Magnetic Separation.”

After the run-of-mine ore undergoes crushing and screening, the coarse-grained fraction can be fed directly into jigs for pre-concentration, allowing for the rejection of a significant volume of tailings. The resulting jig concentrate is then combined with the fine-grained fraction and fed into the grinding-classification circuit. The classifier overflow (the product meeting the required particle size) first enters spiral chutes for roughing and scavenging operations. The resulting rough concentrate is then subjected to further upgrading on shaking tables. Finally, the concentrate undergoes high-intensity magnetic separation to remove magnetic impurities and achieve final purification.

The beneficiated chromite concentrate retains a significant amount of moisture and must undergo dewatering treatment. Typically, a thickener is used for preliminary dewatering, followed by filtration (using equipment such as vacuum disc filters or chamber filter presses) to produce a filter cake with a low moisture content (typically <10%), thereby facilitating transportation and subsequent smelting operations.

Chromite Beneficiation Process Flowchart

Related Case Study

Addressing a challenging chromite-iron ore deposit in Tibet—characterized by low grade, fine-grained dissemination, an initial Cr2O3 grade of only approximately 8.5%, and the presence of deleterious impurities—Henan Bailing Machinery pioneered an innovative combined process flow: “High-Pressure Grinding Roll (HPGR) Pre-treatment – ​​Classification & Gravity Separation – High-Gradient Magnetic Separation – Fine Desilication via Shaking Table.” This process utilized HPGRs to achieve selective crushing and mineral liberation; employed hydrocyclones to classify and segregate materials into different particle size fractions; applied spiral chutes and shaking tables for gravity-based beneficiation; introduced high-gradient magnetic separators to remove weakly magnetic impurities; and finally leveraged the exceptional sorting precision of shaking tables to perform scavenging and desilication operations. This approach successfully elevated the chromite concentrate grade to over 45.00% with a recovery rate of 73.00%, while strictly limiting the SiO2 content to below 3.00%, thereby successfully resolving the complex challenge of the resource utilization of this type of low-grade, impurity-rich chromite-iron ore.

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Ball Mill
  • Feed particle size: ≤25 mm
  • Production capacity: 0.5-150 t/h
  • Applied range: Grinding various ores and other materials. It is widely applied in the production industries of cement, silicate products, new building materials, refractory materials, fertilizers, black and non-ferrous metal beneficiation, as well as glass and ceramics.
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Spiral Classifier
  • Return sand capacity: 140-11880 t/d
  • Overflow capacity: 32-800 t/d
  • Applied range : It is widely applied in the classification of grinding circuits in concentrators, as well as in operations such as ore washing, desliming and dewatering.
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Spiral Chute
  • Feeding density: 20-50%
  • Capacity: 0.2-10 t/h
  • Applied range: It is applicable to the separation of fine materials with particle sizes ranging from 0.02 to 0.4mm, such as iron ore, ilmenite, chromite, pyrite, zirconite, rutile, monazite, phosphorite, tungsten ore, tin ore, tantalum ore, niobium ore, as well as other non-ferrous metals, rare metals and non-metallic minerals with specific gravity differences.
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6s Shaking Table
  • Capacity: 15-108t/d
  • Bed weight (kg): 1012
  • Applied range: It is mainly used for the separation of rare and precious non-ferrous and black metal minerals such as tungsten, tin, tantalum, niobium, iron, manganese, chromium, titanium, bismuth, lead and gold at the level of 2-0.02 millimeters of ore sand and ore mud. After appropriately changing the form of the bed bars, separate the fine coal and coal slime. And sort out other mixed materials with sufficient specific gravity differences and appropriate particle size compositions.
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