Dephosphorizing method for acid vanadium leached solution

Abstract

The invention provides a dephosphorizing method for an acid vanadium leached solution. The pH value of the acid vanadium leached solution involved in the dephosphorizing method ranges from 2.5 to 4.0, and the phosphorus concentration ranges from 0.6 g / L to 1.5 g / L; the phosphate removing agent adopted in the method is a composite phosphate removing agent composed of a component A and a component B, wherein the component A is one of Al2(SO4)3, MgSO4, CaSO4, SrSO4 and ZnSO4; the component B is [Fe(OH)n(SO4)m]q; in [Fe(OH)n(SO4)m]q, n is greater than or equal to 0.5 and less than or equal to 2, m is greater than or equal to 1 and less than or equal to 3, and q is greater than or equal to 10 and less than or equal to 100000; the molar ratio of the component A to phosphorus in the acid vanadium leached solution and the molar ratio of the component B to the phosphorus in the acid vanadium leached solution are both 0.1-5:1. According to the method, firstly, the composite phosphate removing agent is added into the acid vanadium leached solution for direct phosphorous removal; secondly, reaction liquid is subjected to aging and filtration, and then a dephosphorized vanadium leached solution is obtained. Compared with the prior art, the method has the advantages that the process is simple, and the dephosphorizing rate is high.

Description

technical field [0001] The invention relates to a method for dephosphorizing the acidic vanadium leaching solution produced from converter vanadium slag. Background technique [0002] Vanadium has many uses and is an important strategic resource. At present, most of the converter vanadium slag is used as raw material to extract vanadium from it. The process of extracting vanadium is to obtain clinker after calcification and roasting of converter vanadium slag, and use sulfuric acid as a leaching agent for leaching to obtain an acidic vanadium-containing leaching solution (acid vanadium leaching solution). Then carry out hydrolysis to precipitate vanadium to obtain the precipitate ammonium polyvanadate [(NH 4 ) 2 V 6 o 16 ], and finally obtained vanadium pentoxide (V 2 o 5 ). Because some impurity elements contained in the acidic vanadium leaching solution will have an adverse effect on the vanadium extraction process; especially when the phosphorus content is too larg...

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Problems solved by technology

However, in the existing phosphorus removal methods, in addition to comparing single forms of phosphorus (H 2 PO 4 － 、HPO 4 2－ or PO 4 3－ ) in addition to the acidic vanadium leaching solution that exists, for the acidic vanadium leaching solution containing complex forms of phosphorus salts (tripolyphosphate, phosphorus-containing heteropolysalt, etc.) with a pH value not greater than 4, there are complex processes, or The phosphorus removal rate is not high enough

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