Process of purifying dephosphorization slag to extract vanadium in vanadium pentoxide production

Abstract

The invention discloses a process of purifying dephosphorization slag to extract vanadium in vanadium pentoxide production, i.e. a technology of purifying the dephosphorization slag to extract vanadium in the vanadium pentoxide production. The process comprises the following steps of: (1) taking the dephosphorization slag; (2) pulping through a water mill: pulping the dephosphorization slag though either a wet ball mill or a pulping machine; (3) heating: heating the solution to 85-95 DEG C through steam and then stirring; (4) filter pressing: carrying out solid-liquid separation; (5) filtrate: pumping the separated solution into a settling tank for settling and then entering a liquid storage tank; (6) vanadium precipitation: regulating the pH value of the solution to 2-2.5 through sulfuric acid, adding ammonia chloride according to an ammonia adding coefficient of 1.1, and heating supernatant through the steam till vanadium concentration is less than 0.08g / l to obtain ammonium polyvanadate; (7) washing and filtering; (8) melting and preparing pieces; and (9) packaging and putting into storage. The process of purifying the dephosphorization slag to extract vanadium in the vanadium pentoxide production solves the problems that a good deal of vanadium resource is lost in process of producing vanadium pentoxide, and the vanadium recovery effect is bad and vanadium can not be effectively recycled in the prior art.

Description

technical field [0001] The invention relates to a process method for purifying phosphorus-removing slag and extracting vanadium in the production of vanadium pentoxide. Background technique [0002] During the production of vanadium pentoxide in the vanadium plant, calcium chloride is used as the phosphorus removal agent for the dephosphorization of the vanadium leaching solution. The plate and frame filter press performs pressure filtration treatment, and the filter cake contains more than 50% water after filtration, resulting in a higher SV in the filter cake. (The content of TV in the dry basis of phosphorus removal slag is 10%-13%, the content of SV is 2.5%-4%, and the content of P is 3.8%-6%), resulting in a large loss of vanadium resources, and the recovery of vanadium has great value. At present, most domestic manufacturers have not adopted effective methods for recycling. Some manufacturers mix it with vanadium slag and mix it with alkali to extract vanadium by roas...

AI Technical Summary

Problems solved by technology

[0003] The invention provides a process for vanadium pentoxide production, purification, dephosphorization, and slag extraction of vanadium. The invention solves the problem of the loss of a large amount of vanadium resources caused by the production of vanadium pentoxide in a vanadium plant. The recovery effect of vanadium in the prior art is poor and cannot reach to the problem of effective recycling

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