Removing Arsenic from the NiSO₄ Solution Using Modified D301 Resin

Arsenic is removed from the NiSO₄ solution using modified D301 resin. The modification is based on the fact that \( {\text{WO}}_{4}^{2 - } \) react with \( {\text{AsO}}_{4}^{3 - } \) in the NiSO₄ solution to form arsenotungstic ions. This study grafted \( {\text{WO}}_{4}^{2 - } \) onto the resin to remove arsenic in the NiSO₄ solution and avoided the loss of tungsten. The effects of reaction time, temperature, and the pH of solution on arsenic removal efficiency were investigated. When the reaction time is 4 h and the pH value of solution is 3.06, arsenic is removed using \( {\text{WO}}_{4}^{2 - } \)-loaded D301 in the NiSO₄ solution at normal temperature. Results show that the concentration of As (V) from 50 mg/L fell to below 5 mg/L in the NiSO₄ solution. There is no impurities were brought in the process of arsenic removal, achieving higher ratio of arsenic removal in the industry.