copper ore flotation beneficiation process

Principle of flotation

Copper ore flotation is based on the differences in hydrophobicity and hydrophilicity of the mineral surface.By adding flotation agents, such as collectors, foaming agents and adjusting agents, the hydrophobicity of copper ore is enhanced, so that it attaches to the air bubbles and floats to the surface of the slurry to form a foam layer, thereby achieving separation from gangue.

1. Crushing and screening, controlling feed particle size

After mining, the raw ore exhibits uneven particle sizes and interlocking of minerals with impurities, making it unsuitable for direct flotation processing. The ore is first crushed through multi-stage crushing equipment and graded by screening devices, with qualified-sized ore sent to the next stage while unqualified material is returned for re-crushing. A uniform and stable feed particle size can reduce the load on subsequent grinding operations and ensure effective individual liberation in later stages.

2. Grinding and classification to achieve mineral liberation

The crushed ore is fed into the grinding equipment to be pulverized into fine slurry, ensuring the complete monomer dissociation of copper minerals enclosed within the gangue. The ground slurry is then sent to the classification equipment for screening treatment. Slurry meeting the required particle size standards proceeds to the flotation process, while coarser material is returned to the mill for further grinding. This step serves as the foundation of the flotation operation, directly determining whether the copper minerals can be fully separated.

3. Adjusting the pulp and adding reagents to create flotation conditions

The qualified slurry enters the mixing equipment for adjustment, where various specialized flotation reagents are sequentially added based on the characteristics of the copper ore. Through thorough stirring, the reagents are evenly attached to the mineral particles' surfaces, altering the hydrophilic and hydrophobic properties of copper minerals and gangue. This enables the copper minerals to meet the conditions for flotation while inhibiting the flotation of impurity minerals, laying a solid foundation for precise separation.

4. Rough Selection Operation, Preliminary Enrichment of Copper Minerals

The adjusted slurry is fed into the flotation machine for roughing operations. The equipment generates a large number of fine bubbles through aeration and stirring. The modified copper mineral particles adhere to the bubble surfaces and float upward, forming a foam concentrate, while the remaining gangue impurities at the bottom are preliminarily separated as tailings. Roughing can rapidly achieve the basic enrichment of copper minerals and significantly remove most useless impurities.

5. Selective and Scanning Selection, Optimizing Sorting Quality

The rough concentrate obtained from the rough selection has a high impurity content, requiring multiple fine selection operations to further remove gangue impurities and improve the copper concentrate grade. The tailings discharged from the rough selection still contain a small amount of unrecovered copper minerals, which are re-floated through a scavenging process to maximize the recovery of residual valuable minerals, effectively reducing metal loss and enhancing overall recovery rates.

6. Dewatering and concentration to obtain the finished concentrate

The high-grade copper concentrate produced by flotation is in a liquid slurry state and cannot be directly stored or sold externally. Through processes such as thickening and filtration dewatering, excess moisture in the slurry is removed, forming dry and stable solid copper concentrate. The tailings, after compliant treatment, can be uniformly stacked or subjected to secondary comprehensive utilization, completing the entire flotation process.