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Method for purifying and enriching vanadium from stone coal pickle liquor

A technology of acid leaching solution and stone coal, applied in the field of purification and enrichment of vanadium, which can solve the problems of reducing vanadium extraction efficiency, loss of vanadium, and increase of extraction stages, so as to promote the extraction and separation of vanadium, stabilize the pH value of the solution, and increase the extraction stages The effect of shortening

Active Publication Date: 2017-01-25
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the extraction process, there are mainly the following problems: (1) A variety of impurity ions can be extracted by the extractant, and the co-extraction of impurity ions affects the extraction efficiency of vanadium. At the same time, the vanadium-enriched liquid contains more impurities, which affects the purity of vanadium products; The extraction of metal ions by extractant P204 or P507 belongs to the cation exchange mechanism, and H + , so that the pH of the solution decreases, deviates from the optimum range of pH during vanadium extraction, reduces the extraction efficiency of vanadium, and increases the number of extraction stages
(3) Phosphorus in the solution enters the organic phase by entrainment or other means, and enters the vanadium-rich solution after stripping and enrichment, which is not conducive to the subsequent precipitation and recovery of vanadium
Although this method can remove phosphorus solutions with a pH value of 2.5~4.0, the pH value of the vanadium acid leaching solution for stone coal extraction is usually 0~2. When the pH value is greater than 2, some metal ions are hydrolyzed, resulting in loss of vanadium and the formation of colloids. Substances hinder the process of vanadium extraction, so the application of this method to remove phosphorus has great limitations

Method used

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Examples

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Effect test

Embodiment 1

[0033] A method for purifying and enriching vanadium from stone coal acid leaching solution. The concrete steps of described method are:

[0034] Step 1. Preparation of Extraction Stock Solution

[0035] Add calcium-containing substances into the stone coal acid leaching solution, adjust the pH value to 1.0~1.2, and separate the solid and liquid to obtain neutralization liquid and neutralization slag; then add iron powder to the neutralization liquid, the amount of iron powder added It is 1.0~1.1 times the theoretical amount of iron powder required to reduce Fe(III) to Fe(II); stir at 15~30°C for 25~30min, then add weak acid salt to adjust the pH value to 1.7~1.9, Obtain the extract solution.

[0036] Step 2. Extraction

[0037] According to the volume ratio of extractant: TBP: sulfonated kerosene is (0.1 ~ 0.2): (0.06 ~ 0.1): 1 batching, mixing, the organic phase is obtained; then according to the volume ratio of the extraction stock solution: the organic phase For (4~6):...

Embodiment 2

[0047] A method for purifying and enriching vanadium from stone coal acid leaching solution. The concrete steps of described method are:

[0048] Step 1. Preparation of Extraction Stock Solution

[0049] Add calcium-containing substances into the stone coal acid leaching solution, adjust the pH value to 1.0~1.2, separate the solid and liquid, and obtain the neutralization solution and the neutralization slag; then add sodium sulfite to the neutralization solution, and the amount of sodium sulfite is The reduction of Fe(III) to Fe(II) is 1.0~1.1 times the theoretical amount of sodium sulfite; stir at 15~30°C for 25~30min, then add weak acid salt to adjust the pH value to 1.7~1.9 to obtain the extraction solution .

[0050] All the other are with embodiment 1.

Embodiment 3

[0052] A method for purifying and enriching vanadium from stone coal acid leaching solution.

[0053] In this embodiment, except that the calcium-containing substance is CaCO 3 Except the mixture of CaO, all the other are with embodiment 1.

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Abstract

The invention relates to a method for purifying and enriching vanadium from stone coal pickle liquor. According to the technical scheme, the method includes: adding calcium-containing substances into the stone coal pickle liquor to regulate pH, and performing solid-liquid separation to obtain neutral residues and neutral liquid; adding iron powder or sodium sulfite into the neutral liquid, and adding weak acid salt to obtain an extraction stock solution; extracting the extraction stock solution to obtain loading organic phase and raffinate, washing the loading organic phase to obtain washed loading organic phase, performing reverse extraction on the washed loading organic phase to obtain lean organic phase and rich-vanadium liquid; returning the lean organic phase to extraction after regeneration treatment. The method has the advantages that the pH of the solution during the extraction is stable, extraction stage is short, the separation effect of vanadium and various impurity ions is good, and the rich-vanadium liquid is low in impurity content.

Description

technical field [0001] The invention belongs to the technical field of purifying and enriching vanadium. In particular, it relates to a method for purifying and enriching vanadium from stone coal acid leaching solution. Background technique [0002] Stone coal is a unique vanadium-containing resource in my country. The vanadium in stone coal mainly exists in the crystal lattice of mica-like aluminosilicate minerals. When vanadium is extracted from stone coal, the structure of silicate minerals is destroyed, and aluminum, iron, Phosphorus is also leached at the same time, and the purification and enrichment of vanadium from the multi-impurity complex solution system is a key step in the extraction of vanadium from stone coal. In industrial production, after the acidity of the leaching solution is adjusted and reduced, the acidic extractant P204 or P507 is used as the main raw material to prepare the organic phase for extraction, and the vanadium-rich solution is obtained afte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/38C22B3/44C22B34/22
CPCC22B3/44C22B34/22C22B3/28C22B3/3842Y02P10/20
Inventor 张一敏师启华刘涛黄晶陈铁军
Owner WUHAN UNIV OF SCI & TECH
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