How to Process Complex Scheelite Ores with Mixed Grain Sizes?

2025-12-26

Processing complex scheelite ores with mixed grain sizes requires a strategic combination of beneficiation techniques to account for the grain size variability and the associated gangue minerals. Here’s an outline of the key steps and considerations:

1. अयस्क लक्षण वर्णन

• खनिजीय विश्लेषण: Conduct a detailed mineralogical study to understand the distribution of scheelite (calcium tungstate, CaWO₄), associated gangue minerals (calcite, silicates, sulfides, etc.), and impurities.
• Grain Size Analysis: Determine the scheelite liberation size and assess the variation in grain size, as it will influence the choice of the beneficiation methods.
• रासायनिक विश्लेषण: Assess the tungsten content and impurities such as sulfur, phosphorus, and arsenic.

2. कुचलना और पीसना

• क्रशिंग: Crush the ores to a suitable size to prepare for comminution and subsequent separation processes while minimizing over-grinding.
• पीसना: Implement staged grinding to liberate scheelite from gangue while avoiding excess fine particles that can reduce flotation efficiency. Employ closed-circuit grinding (e.g., ball mill with cyclone classification).

3. Pre-Concentration

• Use gravity-based methods (like jigs, shaking tables, or spirals) to separate coarse-grained scheelite before fine-grained processing.
• Heavy media separation may also be used for ores with distinct density differences between scheelite and gangue minerals.

4. Flotation for Fine-Grained Scheelite

• परिस्थितिकी: Adjust the pH to slightly alkaline (typically 9-10) using lime or sodium carbonate. Use depressants (e.g., sodium silicate or tannin) to suppress gangue minerals, particularly calcite.
• संग्राहक: Use fatty acids or their derivatives (e.g., sodium oleate) as collectors for scheelite.
• संशोधक: Introduce modifiers to enhance selective flotation (e.g., phosphate depressants, sulfhydryl collectors for sulfides).
• Address the challenge of fine particle processing by implementing measures to promote better particle-bubble interaction during flotation.

5. Magnetic or Electrostatic Separation

• For ores containing magnetite or other paramagnetic minerals, magnetic separation may help remove impurities.
• Electrostatic separation can be useful for additional refining, particularly for fine-grained scheelite concentrates.

6. Hydrometallurgical Processing (Optional, if needed)

• Ores with high impurities or complex associations may require chemical processing post-concentration to remove residual contaminants.
• Alkaline leaching or roasting with soda ash can be used to upgrade concentrates.

7. Tailings Management and Recovery

• Recover fine scheelite particles from flotation tailings using advanced gravity concentration or centrifugal separators (e.g., Knelson concentrators or Falcon concentrators).
• Ensure environmentally secure tailings disposal, especially if the ore contains harmful elements (arsenic, sulfur, etc.).

8. Process Optimization

• Mix different grain sizes strategically during processing to achieve better flow and separation efficiency.
• Customize reagent combinations and operating conditions based on ore variability and mineral intergrowth.

महत्वपूर्ण विचार:

1. रेजेंट चयन: Proper reagent selection is crucial for selective scheelite flotation, particularly for ores with significant calcite or fluorite content.
2. Fine Particle Challenges: Fine materials often pose challenges in flotation due to poor surface interaction. Employ dispersants or hydrophilic coatings to counteract this.
3. Economic and Environmental Feasibility: Opt for environmentally friendly reagents and ensure cost-effective processing routes.

By incorporating these steps and adapting them to the characteristics of the specific ore, complex scheelite ores with mixed grain sizes can be efficiently processed to obtain high-grade tungsten concentrates.

प्रोमिनर (शंघाई) माइनिंग टेक्नोलॉजी कं., लिमिटेड, वैश्विक स्तर पर पूर्ण खनिज प्रसंस्करण और उन्नत सामग्री समाधान प्रदान करने में विशेषज्ञता रखती है। हमारा मुख्य ध्यान निम्नलिखित पर केंद्रित है: सोने की प्रक्रिया, लिथियम अयस्क का लाभ उठाना, औद्योगिक खनिज। एनोड सामग्री उत्पादन और ग्रेफाइट प्रसंस्करण में विशेषज्ञता।

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