Wolframite and Scheelite Mixed Ore with Ore Dressing Method

The flotation of wolframite and scheelite is a difficult problem in the world. Because the composition and structure of the wolframite and scheelite are quite different, the conventional ore dressing method can not decompose the wolfram mixed ore perfectly.

In order to solve the ore dressing problem of wolframite and scheelite mixed ore, some scholars put forward a method to treat the wolframite and scheelite mixed ore.

(1) The mixture of wolframite and scheelite is input to the activation equipment: the ratio of liquid to solid of mechanical activation is 8.8%-20% in ball mill, and the rate of 325 mesh sieve is 95%-99% after mechanical activation.

(2) The activated wolframite and scheelite  ore mixture is entered into a mixing pulping bucket to add sodium hydroxide and soluble carbonate, the decomposing agent needed in the decomposition process, and the amount of soluble carbonate measured with carbonates is 1.65-1.8 times of the total calcium content of the mixed ore, and the addition of sodium oxide is 1.5-2.5 times of the theoretical amount of the alkali decomposition of the mixed tungsten ore. Compared to control in 1-1.1; mixing in pulping ingredients is preferred: 0.15-0.25MPa compressed air, compressed air conduit exit from the bottom of stirred tank 20-30cm, then 2-5% return slag.

(3) Open the stirrer of the reactor to agitator and open the emptying valve of the reactor, pump the slurry solution into the reactor, and close the emptying valve of the reactor after completion. Heat to 120 C ~200°C, preferably 140°C ~150°C. Stop heating, maintaining for 2~3h.

(4) In the dilution bucket, add 1~5m3 water and optimize the 2~3m3. After opening the diluent agitator, slowly open the discharge valve of the reaction kettle, after the slurry enters the diluent bucket, the discharge valve opens to the 1/2; when the pressure drops to 0.5MPa, the discharge valve of the reaction kettle is fully opened; the temperature control is reduced to 80~120°C, preferably 90~100°C. After filtration, the washing solution was washed without any white color.

The method effectively solves the problem of refractory wolframite and scheelite ores and improves the leaching rate of tungsten ores. 

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