摘要
The goethite residue generated from zinc hydrometallurgy is classified as hazardous solid waste,produced in large quantities,and results in significant zinc loss.The study was conducted on removing iron from FeSO_(4)-ZnSO_(4) solution,employing seed-induced nucleation methods.Analysis of the iron removal rate,residue structure,morphology,and elemental composition involved ICP,XRD,FT-IR,and SEM.The existing state of zinc was investigated by combining step-by-step dissolution using hydrochloric acid.Concurrently,iron removal tests were extended to industrial solutions to assess the influence of seeds and solution pH on zinc loss and residue yield.The results revealed that seed addition increased the iron removal rate by 3%,elevated the residual iron content by 6.39%,and mitigated zinc loss by 29.55%in the simulated solution.Seed-induced nucleation prevented excessive nuclei formation,fostering crystal stable growth and high crystallinity.In addition,the zinc content of surface adsorption and crystal internal embedding in the residue was determined,and the zinc distribution on the surface was dense.In contrast,the total amount of zinc within the crystal was higher.The test results in the industrial solution demonstrated that the introduction of seeds expanded the pH range for goethite formation and growth,and the zinc loss per ton of iron removed was reduced by 50.91 kg(34.12%)and the iron residue reduced by 0.17 t(8.72%).
湿法炼锌过程中产生的针铁矿渣属于危险固体废物,且数量大、锌损失率高。本文采用晶种诱导成核法在FeSO_(4)-ZnSO_(4)溶液中开展除铁研究。借助ICP、XRD、FT-IR和SEM等方法对除铁率,铁渣物相、微观形貌和元素组成进行了分析。采用盐酸分步溶出法考察了锌的赋存状态。同时,在工业原溶液中验证并评估晶种和溶液pH对锌损失和残锌收率的影响。结果表明,在模拟溶液中添加晶种可使铁去除率提高3%,残渣铁品位提高6.39%,锌损失率降低29.55%。晶种诱导可防止新晶核的爆发式形成,有利于晶体的稳定生长和高结晶度。此外,对铁渣表面吸附和晶体内嵌入的锌含量进行了测定,发现锌在残渣表面的分布较为致密,但晶体内部中锌总含量更高。在工业原溶液中的试验结果表明,晶种引入有利于针铁矿在更宽的pH范围稳定生长,且去除1 t铁锌损失可减少50.91 kg/t Fe(34.12%),铁渣减少0.17 t/(8.72%)。
基金
Project(2018YFC1900403) supported by the National Key Research and Development Program of China
Project(CX20210197) supported by the Postgraduate Scientific Research Innovation Project of Hunan Province,China
Project(202206370103) supported by the China Scholarship Council
Project(2021zzts0115) supported by the Fundamental Research Funds for the Central Universities,China。
