Method for extracting tungsten from tungsten-containing sodium carbonate solution and comprehensive utilization of extracted liquid
A technology of sodium carbonate and solution, applied in the direction of calcium/strontium/barium sulfate, etc., can solve the problems of low cost, large discharge of waste water and waste salt, etc., and achieve the effect of reducing waste water discharge and reducing the discharge of waste water and waste salt
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Embodiment 1
[0033] The sodium carbonate solution containing tungsten used is a solution containing WO 3 4% tungsten-containing waste residue, the leachate obtained after high-pressure leaching with sodium carbonate, the leachate contains WO 3 40g / L, containing Na 2 CO 3 60g / L.
[0034] 1) Take 2M 3 The tungsten-containing leachate was slowly added with 98% concentrated sulfuric acid to pH=3 while stirring to obtain 2.06M 3 The pre-exchange solution is then passed through an ion-exchange column of Φ0.6m×1.8m and a height-to-diameter ratio of 3:1 equipped with 400L macroporous weakly basic anion-exchange resin (D301, the functional group is a tertiary amino group) at room temperature. The ion exchange column adopts a steel-lined polypropylene anti-corrosion structure, which can withstand a positive pressure of 0.5MPa, and the outer wall is equipped with a steam heating jacket. The flow rate of the feed liquid is 3L / min, and the contact adsorption time between the feed liquid and the...
Embodiment 2
[0043] The sodium carbonate solution containing tungsten used is a solution containing WO 3 40% scheelite is leached by high-pressure sodium carbonate, and the leachate contains WO 3 120g / L, containing Na 2 CO 3 160g / L.
[0044] 1) Take 2M 3 The tungsten-containing leachate was slowly added with 98% concentrated sulfuric acid to pH=5.5 while stirring to obtain 2.18M 3 The pre-exchange liquid is then transferred to the agitated tank with steam jacket heating, airtight and positive pressure resistance of 900L macroporous weakly basic anion exchange resin (D309, functional group is primary amino group), and then the pre-exchange liquid is stirred. The tank is made of steel-lined plastic, and the drain port at the bottom of the stirring tank is equipped with a water cap to prevent the ion exchange resin from being discharged together with the solution. Control the stirring speed to 60 rev / min, stir and adsorb at 50°C for 4 hours, the WO 3 reduced to 0.09g / L, the adsorptio...
Embodiment 3
[0051] The tungsten-containing sodium carbonate solution used is WO-containing 3 26% scheelite is leached by high-pressure sodium carbonate, and the leachate contains WO 3 92g / L, containing Na 2 CO 3 124g / L.
[0052] 1) Take 2M 3 The tungsten-containing leachate was slowly added with 98% concentrated sulfuric acid while stirring until pH = 4.0 to obtain 2.13M 3 Pre-delivery solution. Primary adsorption: Transfer the pre-exchange liquid into a heated, airtight, and positive pressure-resistant 1-cycle chamber equipped with 500L macroporous weakly basic anion exchange resin (D309, the functional group is a primary amino group). # In the stirring tank, the material of the stirring tank is 316L stainless steel, and the drain port at the lower part of the stirring tank is equipped with a stainless steel metal mesh to prevent the ion exchange resin from being discharged together with the solution. The stirring speed is 60 rev / min, and after stirring and adsorbing at 25°C for...
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