Waste Tungsten-Nickel Catalyst Preparing Sodium Tungstate 2/2
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- Category: Tungsten Information
- Published on Monday, 11 January 2016 19:13
- Written by linlu
- Hits: 232
Nickel, is a kind of approximate silvery white, hard, malleable and ferromagnetic metal element. It can be highly polished and is of corrosion resistance. Tungsten is important strategic metal resource and is also one of China's traditional export minerals. With the continuously exploitation, tungsten resources are decreasing gradually and the waste is very serious. To make up for the original tungsten resource shortage, the recycling of waste tungsten becomes one of the important measures.
Sodium tungstate was prepared by roasting plus sodium-leaching-ion exrhange and with waste tungsten-nickel hydrogenation catalyst as the raw material. We can draw the following conclusions:
1. The influence of the waste catalyst grinding particle size: waste catalyst grinding particle size has a certain influence on leaching rate of tungsten. Tungsten leaching rate after grinding increases by 10%. Grinding to 0.15 mm is the best process condition of experiments.
2. The influence of the dosage of sodium carbonate: As the dosage of sodium carbonate increasing from 0.46 to 0.69, tungsten leaching rate increases by 30%. The effect is very obvious. However, when the dosage of sodium carbonate ratio increases continuously, it has no significant effect on the experimental results. So the most appropriate dosage ratio of sodium carbonate is 0.69.
3. The influence of water temperature and time: Leaching temperature from 80 ℃ to 90 ℃, the leaching rate of tungsten increases by 2%. Leaching time has a small influence on the leaching effect of tungsten. Leaching it in 1 h and 90 ℃, the leaching rate of tungsten can reach nearly 99%.
4. The influence of the adsorption process of ion exchange: String column adsorption method can make each resin to saturated exchange capacity, which greatly improves the production capacity of ion exchange column. Using 2 mol/L NaCl and NaOH 1 mol/L mixture liquid as desorption, tungsten desorption rate can reach 98.2%.
5. Mix and heat the desorbed liquid. By evaporation, crystallization and recrystallization white crystal can be got. The purity of sodium tungstate products can reach more than 99%.
In conclusion, the method of using waste tungsten - nickel hydrogenation catalyst as raw material, using roasting plus sodium-leaching-ion exrhange to prepare sodium tungstate has the advantages of simple steps, mild conditions, easy operation, high recovery rate and low production cost. It can meet the requirements of circular economy and environmental protection.
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