Production of pure molybdenum oxide from low grade molybdenite concentrates
A technology of molybdenite and concentrate, applied in the field of producing pure molybdenum oxide from low-grade molybdenite concentrate
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Embodiment 1
[0068] displacement precipitation process
[0069] After pressure oxidation of the molybdenite concentrate and solid-liquid separation of the slurry in an autoclave, the resulting acidic liquid is subjected to displacement precipitation. The main components of the liquid are approximately:
[0070] Mo, g / l
10-16
Cu, g / l
8-11
Fe, g / l
8-11
h 2 SO 4 , g / l
100
[0071] The displacement precipitation process was carried out at room temperature. At the beginning, each gram of iron (Fe 3+ ) Add iron to the liquid at a ratio of 1 gram of iron to 2 grams of iron for every 1 gram of copper in the liquid. The slurry was mixed for 10-15 minutes, then filtered. The solid contained recovered Cu species. The filtrate is then processed to recover Mo.
[0072] By adding Na 2 CO 3 Or NaOH to increase the pH of the filtrate to about 1.05-1.2, and the temperature of the filtrate to about 40-65°C. Then add iron according to ...
Embodiment 2
[0079] Alkaline extraction
[0080] Several experiments were carried out in an attempt to optimize the leaching conditions while minimizing bicarbonate formation. Alkaline extraction data are listed in Table 3. Leaching with sodium carbonate at pH below 7.0 showed almost complete dissolution of molybdenum, but co-dissolution of iron was also significant, probably as carbonate complexes. Leaching with sodium hydroxide did not dissolve much iron. Therefore, trials to optimize the cost and efficiency of leaching evaluated leaching with sodium carbonate starting at pH 6 followed by leaching at pH 9 with sodium hydroxide or leaching with sodium hydroxide alone. Molybdenum was extracted in excess of 98% in these tests (see Table 3, extraction numbers CL-1-CL-6). The leach solution contained 43-79 g / l Mo with silicon being the only significant impurity. Reagent requirements are, on average, about 1.1 lbs of Na per lb of dissolved molybdenum 2 CO 3 and 0.7 lbs NaOH.
Embodiment 3
[0082] alkaline leaching solvent extraction
[0083] Several experiments were carried out to determine the optimum conditions for solvent extraction of molybdenum from alkaline leaching solutions. Solvent extraction studies of molybdenum employed organics containing 10% tridecylamine, 5% decanol and 85% Escaid 110. The results of these studies are summarized in Tables 4A-4C. Initial experiments evaluated the effect of temperature in the pH range of 2.0-2.7. Temperature had no significant effect on molybdenum extraction. For feed solutions containing 63-70 g / l molybdenum, the raffinate contained only 1-40 mg / l molybdenum (>99.9% transfer), indicating a very efficient extraction. The partition coefficient in the freshly stripped organic phase and the feed in the first contact was as high as 133 (g / l Mo organic phase÷g / l Mo aqueous phase). Some silicon and arsenic transfer occurred. When corrected to 200 g / l molybdenum, the first stripping stage contained up to 310 mg / l sili...
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