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A method for extracting vanadium and dephosphorizing vanadium slag with high calcium and phosphorus

A high-calcium and high-phosphorus vanadium slag and dephosphorization technology, applied in the field of vanadium hydrometallurgy, can solve the unseen problems of deep dephosphorization of acidic vanadium-containing leaching solution and dephosphorization of vanadium extraction residue, etc. Wide range, easy industrialization, and the effect of improving recovery rate

Active Publication Date: 2017-04-05
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] So far, there are no relevant research reports on simultaneously solving the deep phosphorus removal of acidic vanadium-containing leaching solution and the dephosphorization of vanadium extraction residue

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Get high-calcium and high-phosphorus vanadium slag (comprising the component of following mass content: V 2 o 5 10.21%, CaO 9.20%, P0.165%) 500g, roasted at 850°C for 120min, and then crushed to -0.096mm (that is, can pass through a sieve with a hole diameter of 0.096mm). The clinker should be acid-leached for 60 minutes according to the liquid-solid ratio of 2:1 and the temperature of 55°C under the conditions of pH=2.6-2.8; after 5 minutes of acid-leaching reaction, start to add iron sulfate according to Fe / P=1.2 (molar ratio) solution. After the first acid leaching reaction, the solid-liquid separation, the obtained first leachate V 2 o 5 40.25g / L and P 0.022g / L, V 2 o 5 The content is 98.87%, and the P content is 0.017%. The first acid leaching residue was reacted with dilute sulfuric acid for 10 minutes for the second acid leaching under the condition of pH=0.6-0.7, and the obtained residue V 2 o 5 0.74% and P 0.020%.

Embodiment 2

[0032] Get high-calcium and high-phosphorus vanadium slag (comprising the component of following mass content: V 2 o 5 13.12%, CaO 6.44%, P0.231%) 500g, roasted at 900°C for 120min, and then crushed to -0.096mm. According to the liquid-solid ratio of 2:1, the temperature is 55 ℃, the first acid leaching reaction is 90 minutes under the condition of pH=2.8-3.0; after 15 minutes of acid leaching reaction, start to add iron sulfate according to Fe / P=1.0 (molar ratio) solution. After the first acid leaching reaction, the solid-liquid separation, the obtained first leachate V 2 o 5 55.83g / L and P0.024g / L, V 2 o 5The content is 98.68%, and the P content is 0.015%. The first acid leaching residue was reacted with dilute sulfuric acid for 30 minutes for the second acid leaching under the condition of pH=0.8-0.9, and the obtained residue V 2 o 5 0.78% and P 0.024%.

Embodiment 3

[0034] Get high-calcium and high-phosphorus vanadium slag (comprising the component of following mass content: V 2 o 5 13.73%, CaO 7.85%, P0.307%) 500g, roasted at 950°C for 120min, and then crushed to -0.096mm. According to the liquid-solid ratio of 2.1:1, the temperature is 55°C, the first acid leaching reaction is 90min under the condition of pH=3.2~3.5; after the acid leaching reaction is 30min, start to add iron sulfate according to Fe / P=0.7 (molar ratio) solution. After the first acid leaching reaction, the solid-liquid separation, the obtained first leachate V 2 o 5 52.31g / L and P 0.022g / L, V 2 o 5 The content is 98.72%, and the P content is 0.015%. The first acid leaching residue was reacted with dilute sulfuric acid for a second acid leaching for 60 minutes under the condition of pH = 0.9-1.0, and the obtained residue V 2 o 5 0.82% and P 0.032%.

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Abstract

The invention discloses a method for extracting vanadium and removing phosphorus from high-calcium high-phosphorus vanadium slag. According to the method, phosphorus removal is started 30 min before the first acid-leaching reaction of clinker to realize the purpose of solution deep phosphorus removal; and the phosphorus removal of residues of first acid leaching is realized by second acid leaching, and meanwhile vanadium in the residues is further reclaimed. The method provided by the invention realizes the preparation of vanadium oxide from high-calcium high-phosphorus vanadium slag, has the characteristics of good phosphorus removal effect, low process cost and high vanadium yield.

Description

technical field [0001] The invention relates to the technical field of vanadium hydrometallurgy, and more specifically, relates to a method for extracting vanadium and dephosphorizing vanadium slag with high calcium and phosphorus. Background technique [0002] Vanadium slag is the main raw material for producing vanadium oxide. At present, there are two main industrialized vanadium extraction processes, namely sodium roasting vanadium extraction process and calcification roasting vanadium extraction process. The vanadium slag used in industrial production is mainly ordinary vanadium slag, which is characterized by low CaO content, generally CaO / V 2 o 5 ≤0.15. However, for CaO / V 2 o 5 ≥0.16, P≥0.06% high-calcium and high-phosphorus vanadium slag, because the high CaO content leads to a significant decrease in roasting conversion rate, it is not suitable to use sodium roasting-water leaching vanadium extraction process; due to high phosphorus content, acidic vanadium-cont...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/04C22B34/22
CPCY02P10/20
Inventor 付自碧高官金何文艺申彪彭毅王俊
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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