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以H_2SO4替代HF为浸出剂,提出了硫酸焙烧—硫酸浸出,从钽铌粗精矿中提取铌的湿法处理新工艺,解决了传统湿法浸出铌精矿中使用HF造成的高成本和污染等问题。结果表明,硫酸焙烧阶段,在粗精矿-74μm占比90%、浓硫酸与矿样质量比80%、焙烧温度300℃、焙烧时间1.5h的条件下,矿样中的铌反应彻底且留在渣相中。浸出阶段采用30%质量比的H_2SO4,在液固比3∶1、温度90℃的条件下浸出3h,铌的浸出率达到93.4%。
Abstract：Applying H_2SO4 instead of HF as leaching reagent to extract niobium from tantalum-niobium concentrate,a new wet treatment process of sulfuric acid roasting and sulfuric acid leaching was proposed to reduce cost and solve pollution issue.The results show that niobium in mineral sample reacts completely and stays in slag in sulfuric acid roasting stage under the conditions including particle size of-74μm of 90%,mass ratio of concentrated sulfuric acid to ore sample of 80%,roasting temperature of 300℃，and roasting time of 1.5h.In the leaching stage,leaching rate of niobium is 93.4% under the conditions including H_2SO4 concentration of 30%,L/S of 3∶1,temperature of 90℃，and leaching time of 3h.
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基本信息:
中图分类号:TF841.6
引用信息:
[1]林璠,张琦,何东升,等.含铌粗精矿中铌的浸出试验[J].有色金属(冶炼部分),2021(12):69-74.
基金信息:
湖北省地质局科研项目（KJ2019-30）; 自然资源部稀土稀有稀散矿产重点实验室开放基金项目（KLRM-KF202002）
2021-11-23
2021-11-23