利用湿法炼锌赤铁矿法沉铁渣制备铁红

湿法炼锌工业中产生的沉铁渣的资源化利用，长期以来是备受关注的问题，渣的堆积容易对环境产生污染。目前主流的三种沉铁方法中的赤铁矿法所产生的赤铁矿渣具有较高的利用回收价值，对其的资源化利用，具有较高的研究价值。本文以湿法炼锌赤铁矿渣为实验对象，探究其在一定条件下使用酸洗浸出的方法制备高纯度铁红颜料的可行性，针对其中主要的杂质硫、锌等，以及不同含铁物相的去除与转化，研究了温度、时间、酸度、液固比对杂质脱除效果的影响。结果表明，在酸度8 g/L硫酸、温度220 ℃、时间3 h、液固比为6 mL/g工艺条件下可获得较好的脱杂提纯效果，可将沉铁渣铁含量由58%提高至66.5%以上，渣中主要杂质硫脱杂率在70%以上，锌等其余杂质脱除率在90%以上。

Preparation of iron oxide red by hematite precipitation residue from hydrometallurgical zinc process

The resource utilization of iron residue produced in the hydrometallurgical zinc smelting industry has always been a concern problem. The accumulation methods are easy to pollute the environment. At present, in the three mainstream iron removed methods,the hematite precipitation residue has a high utilization value of recycling, and its resource utilization has high research value. In this paper, hematite precipitation residue from hydrometallurgical zinc process was as the raw material of experiment, and investigated the feasibility of preparing high-purity iron red pigment by pickling under certain conditions. The removal of main impurities, such as sulfur, zinc, etc, and transformation of different iron phases were carried out. Studied the effect of temperature, time, acidity and liquid-solid ratio on the quality of iron oxide red. The results shown that under the 8g/L of sulfuric acid, the 220 °C of temperature, the 3h of time, and the 6 ml/g of liquid-solid ratio, the iron content of the iron residue can be increased from 58% to more than 66.5%, the sulfur removal efficiency could reach above 70%, and the removal efficiency of zinc and other impurities were over 90%.