炼铜烟灰酸浸液两步法除铁工艺研究

Study on Technology of Iron Removal in Acidic Leaching Liquid of Dust from Copper-smelting by Two Steps

研究了用氧气（或空气）和过氧化氢两步氧化法去除炼铜烟灰酸浸液中的铁。适宜工艺条件为：氧气（或空气）氧化温度９０～９５℃，溶液ｐＨ值４～４．５，加助氧化剂，反应３～４ｈ，除铁率９０％；过氧化氢氧化温度８０℃，溶液ｐＨ值３～４，加少量助氧化剂，氧化３ｈ，然后调节溶液ｐＨ为５～６，使Ｆｅ３＋沉淀分离除铁率９９．８％。两步除铁后溶液中铁含量降至０．

The technology conditions of iron removal have been discussed in acidic leaching liquid of dust from copper-smelting with the methods of the oxidization by oxygen and hydrogen peroxide. The experimental results have shown: When temperature is 9095,pH value of the liquid 44.5, the time of the reaction 34 h and a few oxidizing assistants have been added the rate of eliminating iron is 90% by the oxidization with oxygen (or air). The rate of eliminating iron is 99.8% with hydrogen peroxide when temperature is 80, pH value of the liquid 34, a few oxidizing assistants have been added and the time of the oxidization 3h. Then adjusting pH value of the liquid between 56,Fe3+ become precipitation eliminated. The content of iron in the liquid decreases below 0.01 g/l after the above two methods treating.