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提铜萃余液中三价铁制备二水磷酸铁影响因素研究
- 作者：
陈雨晴1，2，伍赠玲1，2，钟萍丽1，2，季常青1，2，高世康1，2
- 作者单位：
- （1. 低品位难处理黄金资源综合利用国家重点实验室；2. 厦门紫金矿冶技术有限公司）
基金项目：
- 基金项目为空
详细信息：
- 作者简介：
- 陈雨晴（1994—），女，工程师，硕士，研究方向为废水无害化及资源化利用；E⁃mail:838002039@qq. com
- PDF下载
Study on factors influencing the preparation of ferric phosphate dihydrate from the ferric ions in the copper extraction raffinate
- English Author：
Chen Yuqing¹，², Wu Zengling¹，², Zhong Pingli¹，², Ji Changqing¹，², Gao Shikang¹，²
- Unit：
- （1. State Key Laboratory of Comprehensive Utilization of Low‑grade Refractory Gold Ores; 2. Xiamen Zijin Mining and Metallurgy Technology Co., Ltd.）
- 摘要
- 在线预览
- 参考文献
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。
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
Abstract:
In domestic copper hydrometallurgical plants that adopt the solvent extraction-electrowinning process, alarge quantity of copper extraction raffinate containing ferric ions is typically discharged in an open⁃circuit manner tomaintain the acid-iron balance in leaching and hydrometallurgy systems for low⁃grade copper ores, indirectly leading tothe loss of metallic iron. To address this issue, this study investigates the synthesis of ferric phosphate dihydratefrom raffinate through an iron powder reduction-impurity removal-ammonium phosphate process, thereby alleviatingthe burden on environmental treatment systems while recovering valuable iron from the raffinate. The study focused onthe effects of impurity removal reagent dosage on impurity removal efficiency, along with the influence of the dosingratios of n（Fe）∶n（P）∶n（H₂O₂）, washing conditions, and aging phosphoric acid concentration on the product quality offerric phosphate dihydrate. Results show that optimal impurity removal is achieved under the conditions of excess ironpowder, 1.40 g/L sodium hydrosulfide, and 8.00 g/L of sodium carbonate（adjusted to pH 5.83）. A high⁃quality ferricphosphate dihydrate product can be synthesized under the conditions of n（Fe）∶n（P）∶n（H₂O₂）dosing ratio of 1∶1.05∶0.65, double washing with deionized water, and aging phosphoric acid concentration of 0.03 mol/L.
Keywords:
resource⁃based utilization; copper extraction raffinate; reduction and impurity removal; dosing ratio;washing and aging; ferric phosphate dihydrate
