How to separate spodumene from beryl via flotation?

2025-10-02

Separating spodumene (LiAlSi₂O₆) and beryl (Be₃Al₂Si₆O₁₈) through flotation is a complex process that relies on exploiting the differences in their surface chemistry and physical properties. Both spodumene and beryl are industrially significant minerals, with spodumene being a primary source of lithium and beryl being a source of beryllium. Here’s an overview of how to separate these minerals using flotation:

1. Mineral Preparation

• خرد کردن و آسیاب کردن: Both spodumene and beryl should be crushed and ground to the appropriate particle sizes for flotation, typically below 200 mesh (75 µm). Fine grinding helps liberate the minerals from the gangue.
• طبقه‌بندی: Proper sizing ensures particles are within the optimal range for flotation performance.

2. آماده‌سازی گل

• تنظیم pH: The flotation of spodumene and beryl depends heavily on pH. Spodumene typically floats better in a slightly alkaline pH (around pH 7–10), while beryl often floats at slightly acidic or alkaline pH, depending on reagents used.
• Chemical Additives: Specific reagents are added to modify the surface properties of the minerals. These include:
  • کاهش‌دهنده‌ها: Prevent one mineral from floating while allowing the other to float. Sodium silicate or starch can depress beryl or spodumene selectively.
  • جمع‌آورنده‌ها: Surface-active agents that selectively adhere to the desired mineral to improve its flotation. Common collectors for spodumene include fatty acids or oleic acid. For beryl, alkyl sulfates or petroleum sulfonates may be used.
  • Activators/Inhibitors: Chemicals like calcium salts (Ca²⁺) or sodium hexametaphosphate can optimize flotation responses by activating or inhibiting certain minerals based on surface reactions.
• چگالی گل: Adjust slurry density (solid content in the water) to optimize mineral recovery efficiency.

3. فرآیند شناوری

• Primary Flotation: A collector (e.g., fatty acid) is first introduced to float spodumene, while beryl is depressed using appropriate depressants. The froth carrying spodumene is removed.
• Cleaning and Re-Flotation: Spodumene concentrate may be cleaned to improve purity by re-floating to remove entrained beryl or gangue minerals.
• فلوتاسیون معکوس: If contamination occurs, reverse flotation may be used, where gangue minerals are floated, leaving spodumene and beryl in the tailings.

4. Selective Flotation of Beryl

• After spodumene is removed, adjust the flotation pulp’s pH and reagents to target beryl. Spodumene residuals can be depressed using depressants (e.g., sodium silicate) or raising the pH to conditions unfavorable for spodumene flotation. Suitable collectors (e.g., sulfonates) are added to float beryl selectively.

Key Factors to Consider

1. بهینه‌سازی معرف‌ها: The choice and concentration of collectors, depressants, and frothers are critical to selectively float spodumene and beryl.
2. کنترل pH : Carefully monitor and adjust the pulp pH since both minerals respond differently to pH changes.
3. شیمی آب: Variations in dissolved ions (e.g., Ca²⁺, Mg²⁺) in water can influence flotation performance.
4. دما: Frothing and reagent behavior may vary with temperature.
5. آزمایش‌های پایلوت: Conduct laboratory and pilot-scale tests to optimize the flotation sequence for the specific ore being processed.

نتیجه‌گیری

Separating spodumene from beryl via flotation typically involves a multi-stage approach that takes into account pH control, reagent selection, and selective flotation mechanisms. The process often starts by floating spodumene with fatty acids under slightly alkaline conditions while using depressants for beryl. Subsequent flotation stages are adjusted to recover beryl. Each ore will have specific challenges, so customized reagent schemes are often developed through testing.

شرکت پیشرو (شانگهای) فناوری معدن، با تمرکز بر ارائه راهکارهای کامل فرآوری مواد معدنی و مواد پیشرفته در سطح جهانی، در زمینه‌های مختلف فعالیت می‌کند. تمرکز اصلی ما بر فرآوری طلا، غنی‌سازی لیتیوم، مواد معدنی صنعتی و تولید مواد آندی و فرآوری گرافیت است.

محصولات شامل: آسیاب و طبقه‌بندی، جداسازی و آبگیری، تصفیه طلا، فرآوری کربن/گرافیت و سیستم‌های استخراج.

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