Abstract

The results of studying the vanadium recovery from the waste sludge of the manufacture of vanadium pentoxide V₂O₅ using the lime–sulfuric acid technology are discussed. Vanadium mainly exists in the sludge in three following forms: acid-soluble as manganese vanadate, unrecoverable in calcium silicates, and unrecovered as incompletely oxidized vanadium spinelides in the coarse fraction of the sludge. Low-temperature (20–40°C) sulfuric acid leaching of the sludge for complete recovery of acid-soluble vanadium, which is achieved at pH 0.75–0.8, is studied. Various variants of vanadium precipitation from a sulfuric acid solution are examined. The preliminary purification of the solution from impurities makes it possible to produce pure (≥99.4%) vanadium pentoxide during the precipitation of vanadium in the form of ammonium polyvanadate.

中文翻译：

---

从转炉渣石灰-硫酸加工废渣中回收钒

摘要

研究从五氧化二钒V ₂ O ₅生产中的废渣中回收钒的结果讨论了使用石灰-硫酸技术。钒主要以以下三种形式存在于污泥中：酸溶性为钒酸锰，不可回收于硅酸钙中，未回收为不完全氧化的五溴化钒在污泥的粗级分中。研究了在pH值为0.75-0.8的情况下对污泥进行低温（20–40°C）硫酸浸出以完全回收酸溶性钒的方法。研究了从硫酸溶液中沉淀钒的各种方法。从杂质中初步纯化溶液可以在以钒钒酸铵形式沉淀钒的过程中产生纯的（≥99.4％）五氧化二钒。