A method for preparing high-purity vanadium pentoxide by vanadium liquid without ammonium precipitation
A technology of vanadium pentoxide and vanadium precipitation, which is applied in the field of high-purity vanadium pentoxide precipitation in vanadium solution without ammonium, can solve the problems of high cost of cation exchange resin, harsh working environment and complicated process of vanadium precipitation process, and achieve Low cost, no toxic and harmful gas emissions, high recovery effect
Active Publication Date: 2022-06-03
PANGANG GROUP RESEARCH INSTITUTE CO LTD
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Problems solved by technology
The obtained vanadium solution mainly adopts acidic ammonium salt to precipitate vanadium. The yield of acidic ammonium salt to precipitate vanadium is high, and the quality of vanadium product meets the quality standard requirements, but there are the following disadvantages: On the one hand, during the process of using ammonium salt to precipitate vanadium, a large amount of ammonia overflows, resulting in The working environment of the vanadium precipitation process is harsh; on the other hand, the vanadium precipitation generally obtains ammonium polyvanadate, which needs to be calcined at about 500°C to burn off the ammonium in order to obtain the vanadium pentoxide product
Although this method can prepare high-purity vanadium pentoxide, the cost of the cation exchange resin used in this method is relatively high, and multi-step operations are required and the process is complicated
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The invention provides a method for preparing high-purity vanadium pentoxide by precipitating vanadium in vanadium liquid without ammonium. The method comprises the following steps: step a: using an ammonium-free vanadium-precipitating agent to hydrolyze the vanadium solution to deposit vanadium, and obtain a hydrolyzed vanadium-precipitated product after solid-liquid separation; step b: purify the hydrolyzed vanadium-precipitated product by using a dilute organic acid solution, After solid-liquid separation and washing, a purified hydrolyzed vanadium-precipitated product is obtained; step c: calcining the purified hydrolyzed vanadium-precipitated product to obtain high-purity vanadium pentoxide. By adopting the method of the invention to prepare vanadium pentoxide, the vanadium deposition rate can be as high as over 98%, and the purity of vanadium pentoxide can reach over 99.9%. In addition, the present invention uses an ammonium-free vanadium-precipitating agent to deposit vanadium so that no ammonium ions are brought into the vanadium-precipitating process, and the vanadium-precipitating wastewater is easy to treat; the present invention uses organic acid dilute solution for purification, and the purification process is simple and low in cost.
Description
A kind of method for preparing high-purity vanadium pentoxide by vanadium solution without ammonium precipitating vanadium technical field The present invention relates to chemical field, relate in particular to a kind of method for preparing high-purity vanadium pentoxide by vanadium liquid ammonium-free precipitation of vanadium. Background technique Vanadium slag mainly comes from molten iron to extract vanadium, and the vanadium slag that obtains is to extract vanadium technology mainly is sodium roasting to extract vanadium and calcification roasting to extract vanadium. vanadium. The obtained vanadium solution mainly adopts acid ammonium salt for precipitation of vanadium, the yield of acid ammonium salt for precipitation of vanadium is high, and the quality of vanadium product reaches the quality standard requirements, but there are the following shortcomings: on the one hand, in the process of vanadium precipitation using ammonium salt, a large amount of ammonia...
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IPC IPC(8): C01G31/02
CPCC01G31/02C01P2006/80Y02P10/20
Inventor 伍珍秀蒋霖伍金树
Owner PANGANG GROUP RESEARCH INSTITUTE CO LTD