从HDS废催化剂提钒残渣中回收镍的研究

研究了以HDS废催化剂提钒后的残渣为原料制备NiSO4·7H2O的工艺方法,实验结果表明,用浓度为3mol/L、摩尔比为3∶1的盐酸与硝酸混合酸在温度373K下浸取残渣3h,镍提取率可达90%以上。通过调节溶液pH值,可水解除去Al3+、Fe3+、Cu2+,通过加入NaF可除去Ca2+和Mg2+,制得的NiSO4·7H2O样品纯度可达到99%以上。

Recovery of Nickel from HDS Waste Catalyst after Extracting Vanadium

A technology for recovery of nickel from residue remained in HDS waste catalyst after extracting vanadium was studied. The experimental results indicated that nickel recovery of 90 percent can be obtained when the residue is leaching by 3h at 373K with sulfuric and nitric acid mixture(mole ratio at 3∶1 and concentration in 3mol/L). The ions Al~(3+)、Fe~(3+)and Cu~(2+) can be removed from the leaching solution by regulating pH value,and Ca~(2+) and Mg~(2+) by adding NaF. The purity of the sample NiSO_4·7H_2O is more than 99 percent.