Method for removing chloride ions from zinc hydrometallurgy solution
A technology for zinc hydrometallurgy and chlorine removal, which is applied in the field of chlorine ion removal, can solve the problems of slow chlorine ion oxidation reaction speed, low chloride ion removal rate, and low chloride ion content, and achieves no complex equipment requirements, Low cost, good process matching effect
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Embodiment 1
[0030] Pump 8,000L of hydrometallurgy zinc leaching solution with a pH of 0.6 containing 1200mg / L of chloride ions and 112g / L of zinc into the reactor, start stirring, and raise the temperature to 60°C, and start the vacuum pump (2BV5-131 type water ring vacuum pump) And rinse tower circulation pump, then add 14.24Kg potassium permanganate in the solution, promptly control chloride ion and potassium permanganate molar ratio is 3: 1 (oxidant consumption is 1.7 times of theoretical consumption). After the feeding was completed, the insulation reaction was continued for 3 hours, and the reaction pressure was controlled to be 65Kpa during the reaction; after the dechlorination reaction was completed, the chloride ion content in the resulting solution was 82 mg / L, and the removal rate of chlorine was 93%.
Embodiment 2
[0032] Pump 8,000L of wet-process zinc leaching liquid containing 1500mg / L of chloride ions and 124g / L of zinc with a pH of 0.2 into the reaction kettle, start stirring, and raise the temperature to 35°C, and start the vacuum pump (2BV5-131 water ring vacuum pump) And rinse tower circulation pump, then add 20.32Kg permanganic acid in the solution, namely control chloride ion and permanganic acid molar ratio is 2: 1 (oxidant consumption is 2.5 times of theoretical consumption). Feeding is completed and the insulation reaction is continued for 1 hour. During the reaction, the reaction pressure is controlled to be 40Kpa; after the dechlorination reaction is completed, the chloride ion content in the resulting solution is 28 mg / L, and the removal rate of chlorine is 98%.
Embodiment 3
[0034] Pump 8000L of hydro-method zinc leaching liquid containing 1000mg / L of chloride ions and 80g / L of zinc with a pH of 0.15 into the reaction kettle, start stirring, and raise the temperature to 30°C, and start the vacuum pump (2BV5-131 type water ring vacuum pump) And rinse tower circulation pump, then add 16.56Kg potassium dichromate in the solution, promptly control chloride ion and potassium dichromate mol ratio is 4:1 (oxidant consumption is 1.5 times of theoretical consumption). After the feeding was completed, the insulation reaction was continued for 4.5 hours, and the reaction pressure was controlled to be 60Kpa during the reaction; after the dechlorination reaction was completed, the chloride ion content in the resulting solution was 85 mg / L, and the removal rate of chlorine was 92%.
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