摘要
国内采用萃取—电积工艺提铜的铜湿法冶炼厂通常为维持低品位铜矿的浸出和湿法系统的酸铁平衡,需要开路大量含有三价铁的提铜萃余液,间接造成金属铁的损失。针对提铜萃余液中的三价铁,通过铁粉还原—除杂—铵法制备工艺合成二水磷酸铁产品,减轻环保系统处理压力的同时回收了提铜萃余液中的金属铁。重点研究了除杂药剂用量对萃余液除杂效果的影响及铁、磷、过氧化氢投料比,洗涤条件和陈化磷酸浓度对二水磷酸铁品质的影响。结果表明:在过量铁粉、1.40 g/L硫氢化钠及8.00 g/L碳酸钠(pH值调节至5.83)的药剂用量条件下,萃余液除杂效果最佳;在铁、磷、过氧化氢投料比为1∶1.05∶0.65,纯水洗涤2次,陈化磷酸浓度为0.03 mol/L的反应条件下,可合成品质较高的二水磷酸铁。
In domestic copper hydrometallurgical plants that adopt the solvent extraction-electrowinning process,a large quantity of copper extraction raffinate containing ferric ions is typically discharged in an open‑circuit manner to maintain the acid-iron balance in leaching and hydrometallurgy systems for low‑grade copper ores,indirectly leading to the loss of metallic iron.To address this issue,this study investigates the synthesis of ferric phosphate dihydrate from raffinate through an iron powder reduction-impurity removal-ammonium phosphate process,thereby alleviating the burden on environmental treatment systems while recovering valuable iron from the raffinate.The study focused on the effects of impurity removal reagent dosage on impurity removal efficiency,along with the influence of the dosing ratios of n(Fe)∶n(P)∶n(H_(2)O_(2)),washing conditions,and aging phosphoric acid concentration on the product quality of ferric phosphate dihydrate.Results show that optimal impurity removal is achieved under the conditions of excess iron powder,1.40 g/L sodium hydrosulfide,and 8.00 g/L of sodium carbonate(adjusted to pH 5.83).A high‑quality ferric phosphate dihydrate product can be synthesized under the conditions of n(Fe)∶n(P)∶n(H_(2)O_(2))dosing ratio of 1∶1.05∶0.65,double washing with deionized water,and aging phosphoric acid concentration of 0.03 mol/L.
作者
陈雨晴
伍赠玲
钟萍丽
季常青
高世康
Chen Yuqing;Wu Zengling;Zhong Pingli;Ji Changqing;Gao Shikang(State Key Laboratory of Comprehensive Utilization of Low‑grade Refractory Gold Ores;Xiamen Zijin Mining and Metallurgy Technology Co.,Ltd.)
出处
《黄金》
2025年第8期61-65,共5页
Gold
关键词
资源化利用
提铜萃余液
还原除杂
投料比例
洗涤陈化
二水磷酸铁
resource‑based utilization
copper extraction raffinate
reduction and impurity removal
dosing ratio
washing and aging
ferric phosphate dihydrate
