Method and device for preparing sodium vanadate by taking vanadium fine slag as raw material

Abstract

The invention discloses a method and a device for preparing sodium vanadate by taking vanadium fine slag as a raw material, and the method comprises the following steps: drying and grinding the vanadium fine slag, removing metallic iron to obtain a vanadium fine slag material, and mixing the vanadium fine slag material with a sodium salt additive to obtain a mixed material; subjecting the mixed material to pre-oxidation treatment under the conditions of rotary material turning and air blowing, and obtaining a pre-oxidized material; subjecting the pre-oxidized material to high-temperature roasting under the conditions of rotary material turning and oxygen blowing, and obtaining a clinker; and leaching the uncooled clinker to extract vanadium, thereby obtaining the sodium vanadate. According to the method, vanadium in the vanadium fine slag can be fully promoted to be converted into sodium vanadate, and the vanadium conversion rate can be effectively increased; in addition, the method can effectively reduce the reaction temperature and reduce the energy consumption.

Description

technical field [0001] The invention relates to the technical field of preparation of sodium vanadate, in particular to a method and a device for preparing sodium vanadate by using vanadium slag as a raw material. Background technique [0002] Vanadium is a very important strategic material, which occupies a very important position in national economy and national defense in steel, electronics, chemical industry, aerospace, atomic energy, navigation, construction, sports, medical treatment, power supply, ceramics, etc. [0003] At present, the extraction of sodium vanadate from vanadium slag is generally made by grinding the vanadium raw material, then mixing it with compound additives, and then roasting it in a rotary kiln under the condition of oxygen-containing gas and 750-950 ° C to obtain soluble sodium vanadate. The sodium vanadate salt of water is obtained by leaching and extracting vanadium; [0004] For example, the Chinese patent application with the patent applic...

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Problems solved by technology

[0004] For example, the Chinese patent application with the patent application number 201710386380.0 discloses an oxygen-enriched roasting method for preparing sodium vanadate from vanadium-containing raw materials. Inject oxygen-containing gas on the bed of reaction mixture composed of packing materials, and directly heat the reaction through hot flame gas in a rotary kiln at a temperature of 750-950°C; wherein, the ratio of composite additives is 40-60:20-40 : 10~30 sodium chloride, sodium sulfate and sodium carbonate; yet, this method is higher in the roasting temperature in the preparation process of sodium vanadate, needs higher energy, and simultaneously this method makes the vanadium transformation rate in the vanadium raw material lower , the highest vanadium conversion rate is only 95.3%; in addition, due to the low vanadium extraction efficiency of the prior art, the vanadium content in the vanadium tailings is relatively high, therefore, the vanadium tailings prepared in the prior art need to be used as raw materials many times Carry out roasting to remove vanadium, thereby increasing energy consumption

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