Comprehensive Recovery of Valuable Elements from Neutralized Slag of Lead-Zinc Smelting Wastewater
The recovery value of neutralized slag in lead-zinc smelting wastewater is high and the treatment difficulty is high.The wet treatment process is the dominant trend in the future development.According to the characteristics of neutralized slag,a countercurrent acid leaching process was proposed to recover the valuable metals.The influence of different reaction conditions on the leaching effect was investigated.The results show that under the conditions of liquid-solid ratio of 3∶1,slag-acid ratio of 1.67,initial sulfuric acid concentration of 200 g/L,curing sulfuric acid concentration of 98%,room temperature(self-heating leaching)and leaching time of 30 min,the leaching rate of zinc,manganese and germanium in neutralized slag is more than 95%,and the leaching rate of magnesium is 85%above.This technology can transform calcium in neutralized slag into gypsum slag products,arsenic into iron arsenate solid arsenic products,and activated zinc oxide and basic magnesium carbonate products that can be sold are obtained.It can provide support for the green production of Chinese enterprises.
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