中文摘要：

以高铁含铟硫酸锌溶液为原料,采用锌焙砂预中和硫酸锌液,在此基础上采用锌粉置换铟富集回收溶液中的铟。在预中和阶段讨论了焙砂用量对预中和后液酸度的影响,以及预中和后溶液酸度对焙砂中铟浸出影响,通过实验获得预中和最佳条件：预中和实验焙砂用量为理论用量的1.4倍,实验温度控制在70～75℃,预中和时间为30 min,预中和后溶液中硫酸浓度大约降至1.2 g·L-1;置换实验过程中溶液的pH值、反应时间、反应温度、锌粉用量等都是影响锌粉置换效果的因素,其中溶液的pH是影响铟的沉淀率的主要因素。实验确定了锌粉置换沉铟的最佳工艺条件为：溶液pH为4.0左右,反应温度80～85℃,反应时间1 h,锌粉用量为6 g·L-1,沉铟后液中In3＋的浓度降至3 mg·L-1以下。在此最佳条件下,沉铟率在98%以上,沉铟渣中铟的品位在1.5%～3.0%。通过对置换渣的X衍射图谱（XRD）分析表明置换渣中的铟主要以In（OH）3形式存在。这说明置换过程的实质主要是铟的水解过程,随着置换过程的进行,硫酸锌溶液的酸度下降,促进铟的水解沉淀过程。

英文摘要：

Enrichment of indium from zinc sulfate solution containing high iron and indium was studied by zinc calcine pre-neutraliza- tion and zinc cementation for indium precipitation under the pre-neutralization process. The effect of the dosage of pre-neutralization zinc calcine on the liquid acidity after the pre-neutralization and the effect of the liquid acidity on the leaching of indium from the cal- cine were discussed. Under a certain experimental condition, the optimal condition in pre-neutralization process was put forward： the dosage of zinc calcine was 1.4 times of theoretic value, the temperature of pre-neutralization was 70 to 75 ℃, the time of pre-neutral- ization was 30 min, and the concentration of solution was about 1.2 g·L^-1. Under the process of zinc-dust cementation, the pH of so- lution, time, temperature and the dosage of zinc-dust could affect the precipitation and the pH of solution was a major factor. The opti- mal condition was put forward： pH of solution was 4.0, the temperature of the process of zinc-dust cementation was 80 to 85 ℃, the time of the process was 1 h, the dosage of zinc-dust was 6 g·L^- 1, and In^3 ＋ concentration of the solution after cementation was 3 mg·L^ - 1. Under the optimal condition, the precipitation rate of indium was more than 98% ; the content of indium sediment from precipitation was 1.5% to 3. 0%. The X-ray diffraction（XRD） analysis of the cementation residue showed that the main form of element indium in the cementation residue was In（ OH）3, which meant that the main reaction in the cementation process was hydrolyzation of indium. During the cementation process, the acidity of zinc sulfate solution decreased, which accelerated the hydrolyzation and precipitation of indium.