The best-known of the exogenetic ores is alluvial gold which also called placer gold. Alluvial gold refers
Hematite flotation methods are widely used for the beneficiation of iron ore, particularly when the ore is fine-grained or contains impurities not easily removed by other processes like magnetic separation or gravity separation. Here are common hematite flotation methods and an overview of how flotation reagents are introduced:
In direct flotation, hematite is floated directly while silica and other impurities are depressed. This method works when hematite surfaces have good hydrophobicity after treatment with collectors.
Key reagents and their introduction:
In reverse flotation, impurities such as silica are floated away, while hematite settles as the concentrate. This method commonly employs depressants for hematite.
Key reagents and their introduction:
Differential flotation involves altering flotation conditions after each stage to process hematite and gangue separately. This is not as common but is useful in complex ores.
Key reagents and their introduction:
Carrier flotation modifies hematite surfaces using fine particles like magnetite or quartz as "carriers" that facilitate hematite attachment to bubbles.
Key reagents and their introduction:
Reagent effectiveness depends heavily on pH control. The flotation process often requires conditioning agents like lime, sulfuric acid, or caustic soda to achieve the optimal pH range (acidic for reverse flotation, alkaline for direct flotation).
In all the flotation methods, careful control of reagent addition, concentration, and conditioning is crucial to achieving effective separation of hematite. The type and sequence of reagents depend on the properties of the ore and impurities. Automated systems may be used for real-time adjustment of reagent dosage based on ore characteristics and process conditions.
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