Joint Pressure Cooking Decomposition of Tungsten Slag to Improve Tungsten Recycle

The existing pressure cooker method to be abandoned tungsten slag alkaline secondary pressure cooker, tungsten extraction of tungsten in depth, and then the resulting low-tungsten high lye for pressure cook scheelite concentrate and tungsten ore. Finally, autoclaving combined process of black and white tungsten concentrate, the tungsten solution decreased and alkali concentration of tungsten concentration increases, can obtain very good depth extraction effect, not only make full use of the tungsten resources, but also solve the problem of caustic soda recycling.

Joint pressure cooking method Tungsten slag method is:

1.After a pressure cook the scheelite, tungsten pressure in the slag and wolframite pressure residue mixed with lye slurry, control the liquid to solid weight ratio of 2 ~ 4: 1, the alkali concentration of 200 ~ 350g / l. The secondary pressure cooker at 150 ~ 200 ℃, 0.4 ~ 0.8MPa under pressure for 0.5 to 1.5 hours, after the decomposition of the material is filtered, washed, the resulting secondary residue was discarded, the resulting pressure cooing solution is low-alkali solution to scheelite concentrate, tungsten ore high-alkali pressure leaching process.

2.Scheelite concentrate, tungsten ore dry grinding to more than 95% over 325 mesh sieve, according to tungsten concentrate tungsten content added to the low-alkali solution obtained in step 1 and caustic soda, the amount of alkali 3-5 times the theoretical amount, alkali concentration of 400 ~ 550g / l, adjusting the liquid to solid weight ratio of 1.5 ~ 2.0: 1, the material is added with good autoclave autoclave at a temperature of 190 ~ 200 ℃, pressure 0.8 ~ 1.0MPa leaching 1.0 ~ 1.5 hours, the material is decomposed, after diluted and filtered, the boiling liquid is converted into the wolframite compounding stage with the high alkali tungsten containing solution, and the slag is transferred to the two compounding ingredients.

3.Wolframite concentrate dry grinding to more than 90% over 325 mesh sieve, according to wolframite tungsten content adding process 2 the tungsten containing high alkali solution and caustic alkali dosage is 1.4 ~ 2 times of the theoretical amount, add black tungsten concentrate 2% by weight of water glass, add black tungsten concentrate calcium required theoretical amount 80 ~ 100% phosphate salt, adding 2% by weight of wolframite ore body, adjusting liquid to solid weight ratio of 2 to 4: 1, leaching for 1.0 to 1.5 hours at 190 to 200 °C and 1.0 to 1.2 MPa, decomposing the material, diluting and filtering, washing low-alkali tungsten solution into the smelting follow-up process, the slag into the second pressure cooking ingredients.

After the above process, the alkali concentration of the press cooking liquor decreases successively, and the concentration of tungsten increases sequentially. The tungstic acid solution can directly enter a stage process, and the alkali recovery liquid is recovered during the pressing process.

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