Method for recycling manganese ion in electrolytic manganese production tail end wastewater

[0019] Example 1: 100mL of sodium carboxylic acid structure macroporous weakly acidic cation exchange resin with a cross-linking degree of 4 and a particle size of about 100 μm was loaded into a glass exchange column (Φ28×350mm), and the sedimentation treated Mn 2+ The electrolytic manganese wastewater with a concentration of 149.83mg/L, adjust the pH to 4, and pass through the cation exchange column at a flow rate of 3BV/h. The treated water volume of a single column can reach 170BV (bed volume), Mn 2+ The dynamic working exchange capacity is 25.44mg/mL, and the removal rate can reach 99.89%. The treated effluent is colorless and transparent, Mn 2+ The concentration is less than 0.5mg/L. After the cation exchange column is saturated with adsorption, use 0.5mol/L of H 2 SO 4 The flow rate of 24BV/h quickly passes through the resin bed for iterative regeneration. After 6 iterations, the Mn in the regeneration solution 2+ The concentration can be increased to 31.00g/L, which is in line with Mn in the electrolysis process index 2+ With a concentration of 15g/L, it can be reused as an electrolyte in the electrolysis process to realize the recycling of manganese, and the recovery rate can reach 99.7%.

[0020] Example 2: According to the operation steps in Example 1, the 100ml sodium cation exchange resin in Example 1 was changed to another 100ml sodium carboxylic acid structure macroporous with a crosslinking degree of 7 and a particle size of about 500μm Type weakly acidic cation exchange resin, at the same time adjust the pH of the inlet water of the cation exchange column to 6.5, and the inlet water Mn 2+ The concentration is 500.00mg/L, in Mg 2+ When the content is less than 100mg/L (the resin in Example 1 has strong selectivity to manganese, the adsorption of manganese by the resin in Example 2 will be similar to the high concentration of Mg in the wastewater. 2+ Produce competitive adsorption), the water treatment capacity of a single column can reach 80BV, Mn 2+ The dynamic working exchange capacity is 39.92mg/mL, and the removal rate can reach 99.79%. The treated effluent is colorless and transparent, Mn 2+ The concentration is less than 0.5mg/L. After the cation exchange column is saturated with adsorption, use 1.0mol/L of H 2 SO 4 Regenerate through the resin bed at a flow rate of 4BV/h, and Mn in the regenerated liquid 2+ The concentration can be concentrated to 46.8g/L, which can be reused as electrolyte in the electrolysis process to realize the recycling of manganese, and the recovery rate can reach 99.9%.

[0021] Example 3: The H of 1.0 mol/L in Example 2 2 SO 4 The regeneration agent is changed to 1.5mol/L, Mn in the regeneration solution 2+ The concentration can be concentrated to 48.5g/L, which can be reused as electrolyte in the electrolysis process to realize the recycling of manganese. The recovery rate can reach 92.8%. After one iteration, the recovery rate can be increased to 99.5%.