METHOD AND APPARATUS FOR PRODUCING VANADIUM COMPOUND

To provide a method for efficiently and inexpensively producing high-purity vanadium compound.SOLUTION: The producing method includes: an alkali extraction process of adding alkali and water or alkali solution to raw material ash containing ammonium sulfate, sulfuric acid and vanadium to obtain alkaline leachate (Step 12); solid-liquid separation process of performing solid-liquid separation to the alkaline leachate to obtain leached filtrate containing vanadium (Step 14); a concentration process of concentrating the leached filtrate to obtain concentrated liquid (Step 16); and a crystallization and solid-liquid separation process of cooling and crystallizing the concentrated liquid to recover a precipitates containing vanadium compound. In the concentration process, the leached filtrate is concentrated by using a membrane concentration method.SELECTED DRAWING: Figure 1 【課題】高純度バナジウム化合物を効率よく安価に製造する方法の提供。【解決手段】この製造方法は、硫安分と、硫酸と、バナジウムと、を含む原料灰に、アルカリ及び水、又はアルカリ溶液を添加してアルカリ浸出液を得るアルカリ抽出工程（ステップ１２）と、アルカリ浸出液を固液分離して、バナジウムを含む浸出ろ液を得る固液分離工程（ステップ１４）と、浸出ろ液を濃縮して濃縮液を得る濃縮工程（ステップ１６）と、濃縮液を冷却して晶析し、バナジウム化合物を含む析出物を回収する晶析・固液分離工程と、を含む。濃縮工程では、膜濃縮法を用いて浸出ろ液を濃縮する。【選択図】図１