Method of extracting high-purity V2O5 in dilute sulfuric acid leaching solution of stone coal vanadium ore calcine by adopting normal-temperature direct precipitation method

Abstract

The invention provides a method of extracting high-purity V2O5 in a dilute sulfuric acid leaching solution of stone coal vanadium ore calcine by adopting a normal-temperature direct precipitation method. The technological process comprises the following steps of (1) crushing, grinding and roasting stone coal vanadium ores; (2) carrying out circulation trickle leaching or multi-segment stirring leaching of the stone coal vanadium ore calcine with the dilute sulfuric acid; (3) filtering to obtain a leaching solution with the vanadium concentration to be larger than 6.0g / L; (4) directly adding a complex depositing agent into the dilute sulfuric acid leaching solution under the ambient temperature condition without removing impurities, and obtaining precipitates, wherein the vanadium precipitation rate is larger than or equal to 95 percent; (5) dissolving the precipitates with alkali, separating vanadium from the impurities through filtering, and leaving the vanadium in a filtrate, wherein the vanadium dissolution rate is larger than or equal to 95 percent; (6) enabling the cooled filtrate to react with an ammonium salt to produce ammonium metavanadate, wherein the vanadium precipitation rate is larger than or equal to 99 percent; (7) washing the ammonium metavanadate so as to improve the quality of the vanadium; and (8) calcining the ammonium metavanadate to prepare the high-purity vanadium pentoxide, wherein the quality of the V2O5 is larger than 99 percent. The method has the advantages of short technological process, simpleness and convenience in procedure, simpleness in operation, higher work efficiency, lower production cost, further lowering environmental pollution and the like.

Description

technical field [0001] The invention relates to a method for extracting high purity V 2 o 5 Methods. It belongs to the field of hydrometallurgy. Background technique [0002] For the sulfuric acid leaching solution of stone coal vanadium ore, in industrial production, after pretreatment, physical methods such as multi-stage countercurrent extraction or ion exchange adsorption are usually used to enrich vanadium, and then hydrolyze to precipitate vanadium. The hydrolysis of vanadium precipitation is generally carried out at 90°C to boiling state, and the obtained V 2 o 5 The purity is not high, and the amount of sewage is large. [0003] When chemical enrichment is used, complex purification processes such as silicon removal and phosphorus removal are generally required, and the temperature of vanadium deposition is required to be controlled at 95°C to boiling. [0004] At present, the direct vanadium precipitation process under normal temperature conditions is mostly u...

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Problems solved by technology

[0005] The above methods all have problems such as long process flow, complex process, difficult control of technical parameters, high energy consumption, low work efficiency, low product quality, large amount of wastewater treatment and low efficiency.

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