微波硫酸化焙烧—水浸法处理铁矾渣新工艺

发布时间：2018-01-01 23:28

本文关键词：微波硫酸化焙烧—水浸法处理铁矾渣新工艺　出处：《昆明理工大学》2015年硕士论文　论文类型：学位论文

【摘要】：在湿法炼锌工艺中,热酸浸出-黄钾铁矾法由于铁矾渣过滤性能好,易于沉降、过滤和洗涤,因而被广泛用于浸出液除铁过程。但是该工艺所产铁矾渣渣量大,重金属含量高,长期堆存容易造成环境污染。为了消除铁矾渣对环境的危害问题,同时作为二次资源从渣中回收有价金属,提出了“微波硫酸化焙烧-水浸-针铁矿法除铁”处理铁矾渣的新工艺。将铁矾渣与浓硫酸混合后进行微波焙烧,焙烧渣进行水浸和固液分离后,得到富含有价金属Fe、Zn、In、Cu、Ag和Cd等的浸出液和富含Pb的浸出渣；浸出液采用针铁矿法除铁,得到可用作炼铁添加料的铁渣,而除铁后的溶液可返回湿法炼锌系统中进一步回收其中的有价金属Zn、In、Cu、Cd和Ag等,富含Pb的浸出渣可用作火法炼铅的添加料。硫酸化焙烧-水浸实验表明,在硫酸(90 wt.%)用量为渣重的36%、微波焙烧温度250℃、保温时间30min、浸出温度50℃、浸出时间1h、搅拌速度300r/min、液固比4：1的优化工艺条件下,Fe、Zn、In、Cu、Ag和Cd的浸出率分别达到89.4%、80.7%、85.1%、90.7%、61.3%和48.8%,而Pb则基本以PbSO4的形式富集于浸出渣中。浸出液针铁矿法除铁实验表明,在pH值为3.0、温度90℃、浸出液滴加速度3mL/5min、晶种添加量20g/L的优化工艺条件下,除铁率可达到99.3%,而其余有价金属的损失率均很小,所得到的除铁渣中铁的含量为47.08%。
[Abstract]:In the process of zinc hydrometallurgy process in hot acid leaching jarosite slag due to good filtering performance, easy sedimentation, filtration and washing, which is widely used in the leaching process of iron removal. But this process produced by jarosite residue and heavy metal content is high, the long-term storage is easy to cause environmental pollution. In order to eliminate the hazards of jarosite slag on the environment, at the same time as the two resource recovery of valuable metals from slag, put forward the "microwave sulfated roasting water leaching by goethite in addition to the new technology of iron processing slag. The slag mixed with concentrated sulfuric acid after microwave roasting roasting slag by soaking in water and solid-liquid separation, are rich in valuable metals Fe, Zn, In, Cu, Ag and Cd leaching residue leaching liquid and rich Pb; leaching solution using goethite iron removal method, can be used as additives to get ironmaking slag, and in addition to the solution of iron into a wet back zinc smelting system Step recovery of these metals Zn, In, Cu, Cd and Ag, Pb rich slag can be used as leaching additive lead pyrometallurgy. Sulphation roasting and water leaching experiments show that in sulfuric acid (90 wt.%) was 36% of the weight of slag, microwave roasting temperature of 250 DEG C, holding time 30min. The leaching temperature of 50 DEG C, extraction time 1H, stirring speed 300r/min, liquid-solid ratio optimization conditions of 4:1, Fe, Zn, In, Cu, Ag and Cd leaching rate of 89.4%, respectively, 80.7%, 85.1%, 90.7%, 61.3% and 48.8%, while the Pb is in the form of PbSO4 enrichment in leaching residues needle. Leaching solution of iron ore removal by iron experiment shows that when the pH value is 3, 90 degrees Celsius temperature, leaching liquid droplet acceleration 3mL/5min, the seed amount of 20g/L under the optimal conditions, the iron removal rate can reach 99.3%, while the rest of the valuable metal loss rate is very small, resulting in iron slag the content is 47.08%.

【学位授予单位】：昆明理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X756

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