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（一）历史情况 我国第一个钒生产车间（锦州铁合金厂）原系四十年代初由德国设计建成的（以承德钒精矿为原料沉淀钒酸铁）,直到1945年尚未正式投产。解放后,在原基础上由苏联重新设计,先期仍用承德钒精矿作原料制取V_2O_5,但由于所用原料品位低（精矿含钒0.4％）,溶液需反复浸出富集,才能达到沉淀V_2O_5。所要求的浓度,因此采用了内滤式真空过滤机、浓缩机等一系列较庞大的浸出设备。这种用浓
(I) History The first vanadium workshop in China (Jinzhou Ferroalloy Factory) was originally designed and built by Germany in the early 1940s (iron vanadate was precipitated from Chengde vanadium concentrates). It was not put into operation until 1945. After the liberation, based on the original design by the Soviet Union to re-design, the first still use Chengde vanadium concentrate as raw material preparation V_2O_5, but due to the low raw material grade (concentrate containing vanadium 0.4%), the solution needs repeated leaching enrichment in order to achieve precipitation V_2O_5 . The required concentration, therefore using a filter filter, thickener and a series of more large leaching equipment. This kind of thick