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Method for selectively removing impurity P from vanadium solution obtained through vanadium slag calcification and acid leaching

A selective and solution technology, applied in the field of removing impurity P, can solve the problems of complex process, flammability, volatile organic extractant, etc., and achieve the effects of low vanadium loss rate, low phosphorus removal cost, and good phosphorus removal effect.

Inactive Publication Date: 2018-08-03
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Based on the difference in charge between V (V valence) and P (V valence) in the acidic solution medium, some literatures try to use solvent extraction to selectively extract, separate and enrich V in the acidic vanadium solution, in order to A solution that meets the V / P requirements required for subsequent vanadium precipitation is obtained, but when the content of impurities Fe and Si in the solution is high, three-phase and turbidity will easily appear during extraction, and the organic extractant is volatile and flammable, and contains an organic phase The raffinate and vanadium precipitation waste liquid will become new sources of pollution
In addition, extraction purification includes reduction (Fe (valence III) → Fe (valence II), V (valence V) → V (valence IV)), pre-extraction sulfonation, pre-extraction aqueous phase pH adjustment, multi-stage extraction and multi-stage Multiple stripping steps, complex procedures and high costs limit the application of solvent extraction in the purification of acidic vanadium solutions

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Calcination activation temperature of powdered calcium silicate is 200°C, calcination time is 120 minutes, take 10g of calcined and activated calcium silicate, add it to 1000mL acidic vanadium solution (solution pH=2.50, vanadium concentration is 7.51g / L, phosphorus concentration is 98.84 mg / L), stir evenly, adjust the pH of the solution system to 4.5 with a sulfuric acid solution with a mass concentration of 10%, continue to stir for 180 minutes at 60°C, filter after the reaction finishes, measure the vanadium and phosphorus concentrations in the filtrate, and obtain the phosphorus removal rate was 75.52%, and the vanadium loss rate was 2.11%.

Embodiment 2

[0031] The calcining activation temperature of powdered calcium silicate is 800°C, and the calcining time is 120 minutes. Take 10 g of calcined and activated calcium silicate and add it to 1000 mL of acidic vanadium solution (solution pH=2.55, vanadium concentration is 8.01 g / L, phosphorus concentration is 100.00 mg / L), stir evenly, adjust the pH of the solution system to be 2.5 with a sulfuric acid solution with a mass concentration of 20%, continue to stir for 180 minutes at 60°C, filter after the reaction finishes, measure the vanadium and phosphorus concentrations in the filtrate, and obtain the phosphorus removal rate is 52.51%, and the vanadium loss rate is 2.1%.

Embodiment 3

[0033] Calcination activation temperature of powdered calcium silicate is 800°C, calcination time is 120 minutes, take 12g of calcined and activated calcium silicate, and add it to 1000mL acidic vanadium solution (solution pH=2.55, vanadium concentration is 8.01g / L, phosphorus concentration is 100.00 mg / L), stir evenly, adjust the pH of the solution system to 4.5 with a sulfuric acid solution with a mass concentration of 10%, continue to stir for 180 minutes at 60°C, filter after the reaction finishes, measure the vanadium and phosphorus concentrations in the filtrate, and obtain the phosphorus removal rate is 80.75%, and the vanadium loss rate is 3.56%.

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Abstract

The invention relates to the field of acid vanadium solution purifying and dephosphorization, and discloses a method for selectively removing the impurity phosphorus from a vanadium solution obtainedthrough vanadium slag calcification and acid leaching. The method comprises the following steps that powdery calcium silicate is calcined and activated; the calcined and activated powdery calcium silicate is added into the vanadium solution obtained through vanadium slag calcification and acid leaching, the pH value of the solution system is adjusted to be 2.5-5.0, stirring, reaction and filtration are carried out, and the low-phosphorous vanadium solution is obtained. According to the method for selectively removing the impurity phosphorus from the vanadium solution obtained through vanadiumslag calcification and acid leaching, the dephosphorization efficiency is high, the cost is low, the allowed impurity phosphorus concentration range is large, phosphorus can be selectively removed, and the vanadium loss rate is low.

Description

technical field [0001] The invention relates to a method for removing impurity P from vanadium solution under acidic conditions. Background technique [0002] Special steel types have increasingly stringent requirements for P, and the basic conditions for dephosphorization of molten iron are low temperature, high oxidation, high alkalinity and large amount of slag. Adding lime or limestone while extracting vanadium from converter molten iron creates a new environment for smelting low-phosphorus steel. The conditions are met, but at the same time, high calcium and high phosphorus vanadium slag is obtained. Due to the formation of calcium vanadate, high calcium and high phosphorus vanadium slag is not suitable as a vanadium-containing raw material in the traditional sodium roasting-water leaching vanadium extraction process. The calcification vanadium extraction process has no special restrictions on the Ca content in the vanadium raw material. The raw material can be treated...

Claims

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Application Information

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IPC IPC(8): C22B3/44C22B34/22
CPCC22B3/44C22B34/22Y02P10/20
Inventor 张菊花张伟肖龙恒薛正良
Owner WUHAN UNIV OF SCI & TECH
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