从某高温合金酸浸渣中回收钨的研究

Tungsten Recovery from the Residue after Acid Leaching of Superalloy

以某高温合金酸浸渣为原料,利用碱焙烧-水浸-离子交换-结晶工艺回收钨制备仲钨酸铵。考察了焙烧温度、焙烧时间、碱用量、水浸温度及水浸时间等因素对钨回收率的影响。实验得出最佳碱焙烧-水浸工艺条件为:焙烧温度700℃、焙烧时间60 min、碱用量为酸浸渣质量的80%、水浸温度85℃、水浸时间60 min,在此条件下,富钨渣中钨回收率可达99%以上。将焙烧-水浸液稀释后,采用201×7树脂在流速为5 cm/min的条件下进行吸附,吸附完毕后使用5 mol/L NH4Cl+2 mol/L NH3·H2O进行解吸,解吸流速为吸附流速的1/2,取解吸高峰液进行结晶,当结晶率80%时仍可得到合格的仲钨酸铵产品。

Tests on recovering tungsten from tungsten-rich residue left after acid leaching of superalloy was conducted by the process of alkali roasting-water leaching-ion exchange-crystallization. Effects of temperature and time for roasting, NaOH dosage, temperature and time for water leaching on the tungsten recovery was investigated. In the test, the roasting process at 700 ℃ for 60 min with NaOH dosage 80% of the mass of residue, which is followed by a water leaching process at 85 ℃ for 60 min, resulted in the recovery of tungsten higher than 99%. The final leachate, after being diluted, was subjected to an adsorption process with 201×7 resin at a flow rate of 5 cm/min, followed by a desorption process by 5 mol/L NH4CI＋2 mol/L NH3 · H20 at flow rate of 2.5 cm/min, resulting in a high-content liquor, which was then crystallized. And a qualified ammonium paratungstate （APT） can be finally obtained with the crystallization rate at 80%.