A method for recovering manganese in manganese-containing sewage
A sewage and waste water technology, applied in the direction of improving process efficiency, can solve the problems of difficult reuse of waste residue, high cost, generation of ammonia gas, etc., and achieve the effect of high added value, low cost, and reduced cost of auxiliary materials
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Embodiment example 1
[0023] The manganese-containing wastewater used has a manganese content of 10g / L, a sulfate radical of 9g / L, a magnesium content of 5g / L, Cl 58g / L, and a pH of 6.
[0024] 1. Add CaCl to manganese-containing wastewater 2 , make the solution theoretically contain Ca amount to be 8g / L, leave standstill after stirring and mixing, then filter to remove the filter residue, obtain the liquid after desulfurization, the solution contains manganese 10g / L, Ca 5g / L, Mg 5g / L, SO4 2- 2g / L, Cl 58g / L.
[0025] 2. Warm up 5L of the desulfurized liquid to 35-40°C, feed air at a flow rate of 5L / min to react, use a small amount of lime milk to control the pH to be weakly alkaline during the process, and react for 4 hours to obtain magnesium-containing sewage and manganese oxide after filtration Slag, magnesium-containing sewage contains Mn 600mg / L, Ca 12g / L, Mg 5g / L, manganese oxide slag contains Mn 50%, Ca 3%, Mg 0.2%, Cl 10%.
[0026] 3. Stir the magnesium-containing sewage and add lime to a...
Embodiment example 2
[0032] Manganese-containing wastewater Mn 10g / L, SO4 2- 9g / L, Mg 5g / L, Cl 58g / L, PH6.
[0033] 1, the manganese-containing waste water and the 3rd step CaCl 2 Mix equal volumes of sewage (Ca 20g / L) evenly, add a small amount of CaSO 4 As a seed crystal, let it settle for 4 hours, and filter to obtain the desulfurized liquid and CaSO 4 Slag, after desulfurization, the liquid contains Mn 5g / L, SO4 2- 2g / L, Ca 8g / L, Mg2.5g / L, Cl 30g / L.
[0034] 2. Heat 16L of the desulfurized liquid to 40-45°C, pass air (air flow rate 10L / min) to react, use lime milk to control the pH to be weakly alkaline during the process, take liquid for analysis every hour, and the Mn concentration is lower than 600mg / min. L, stop the reaction, it takes 5 hours to filter magnesium-containing sewage and manganese oxide slag. The liquid after manganese precipitation contains Mn 420mg / L, Ca 11.3g / L, Mg 2.5g / L, manganese oxide slag contains Mn 48%, Ca 3%, Mg 3%, Cl 8%.
[0035] 3. Add magnesium-containing ...
Embodiment example 3
[0041] Manganese-containing wastewater Mn 10g / L, SO4 2- 9g / L, Mg 5g / L, Cl 60g / L, PH6.
[0042] 1. Combine manganese-containing wastewater and CaCl 2 Sewage (Ca 15g / L) is mixed evenly at a volume ratio of 0.8:1, and a small amount of CaSO is added 4 As seed crystals, stand and filter to obtain desulfurized liquid Mn 5.5g / L, Mg 2.8g / L, Cl 32 g / L, Ca 7g / L.
[0043] 2. Raise the temperature of 16L of the desulfurized liquid to 40-45°C, feed air (air flow rate 10L / min) to react, use lime milk to control the pH to be weakly alkaline during the process, take the liquid for analysis every hour, and after 5 hours, the Mn content is 300mg / L, filtered to obtain magnesium-containing sewage and manganese oxide slag. Magnesium-containing sewage contains Mn 300mg / L, Ca 10g / L, Mg 2.5g / L, manganese oxide slag contains Mn 45%, Ca 2.5%, Mg 2%, Cl 6%.
[0044] 3. Add lime to the magnesium-containing sewage to adjust the pH to be greater than 14, react for 1 hour, and filter to obtain magnesi...
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