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Method for recovering vanadium from calcified vanadium extraction tailings

A technology for extracting vanadium tailings and precipitating vanadium is applied in the field of recovering vanadium and can solve the problems of large loss of vanadium, inability to recover vanadium, loss of vanadium and the like

Pending Publication Date: 2022-04-15
PANGANG GROUP RESEARCH INSTITUTE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to overcome the problems in the prior art that the hydrolyzed and precipitated vanadium in the tailings cannot be recovered when the calcified vanadium extraction tailings are recovered by low pH acid leaching, the concentration of vanadium in low pH acid leaching is high and the concentration of vanadium is easy to hydrolyze, and the vanadium in the impurity removal process To deal with problems such as large losses, a method for recovering vanadium from calcified vanadium extraction tailings is provided. In this method, the calcified vanadium extraction tailings are used in reducing acid leaching, which can recover the hydrolyzed and precipitated vanadium in the tailings, and at the same time avoid low pH acid leaching Vanadium loss caused by hydrolysis and precipitation of pentavalent vanadium in the process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071] (1) the 1 in 1000g table 1 # Calcified vanadium extraction tailings, 20g of calcium sulfite were added to 1500mL of water for beating, and then sulfuric acid was added for leaching. The leaching pH value was 0.8, the leaching time was 10min, and the leaching temperature was 25°C. The pH value is adjusted to 2.5, then solid-liquid separation, obtains 1047g residue and leachate, in residue, V 2 o 5 The content is 0.95% by weight, and the vanadium transfer leaching rate is 65.53%;

[0072] (2) Utilize magnesium carbonate to adjust the pH value of the leachate to 6.8 to carry out vanadium precipitation, then filter to obtain vanadium precipitate and waste water, the concentration of TV in the waste water is 0.04g / L;

[0073] (3) according to the liquid-solid ratio of sodium hydroxide solution and vanadium deposit, be 15.6mL / g to add the sodium hydroxide solution (the content of NaOH is 80g / L) of 400mL in vanadium deposit, feed air, in stirring Under the conditions, react...

Embodiment 2

[0078] (1) the 2 in 1000g table 1 # Calcified vanadium extraction tailings and 19g of calcium sulfite were added to 1500mL of water for beating, and then sulfuric acid was added for leaching. The leaching pH value was 0.9, the leaching time was 20min, and the leaching temperature was 25°C. The pH value is adjusted to 2.7, followed by solid-liquid separation, to obtain 1043g residue and leachate, V in the residue 2 o 5 The content is 0.81% by weight, and the vanadium transfer leaching rate is 65.33%;

[0079] (2) Utilize magnesium carbonate to adjust the pH value of the leachate to 6.7 to carry out vanadium precipitation, then filter to obtain vanadium precipitate and waste water, the concentration of TV in the waste water is 0.04g / L;

[0080](3) be 13.5mL / g according to the liquid-solid ratio of sodium hydroxide solution and vanadium deposit, add the sodium hydroxide solution (the content of NaOH is 100g / L) of 300mL in the vanadium deposit, pass into oxygen, in stirring Rea...

Embodiment 3

[0085] (1) the 3 in 1000g table 1 # Calcified vanadium extraction tailings and 23.5g calcium sulfite were added to 1500mL water for beating, and then sulfuric acid was added for leaching. The pH value of leaching was 0.6, the leaching time was 10min, and the leaching temperature was 25°C. The pH value is adjusted to 2.8, then solid-liquid separation, obtains 1055g residue and leachate, in the residue V 2 o 5 The content is 0.87% by weight, and the vanadium transfer leaching rate is 68.89%;

[0086] (2) Utilize magnesium carbonate to adjust the pH value of the leachate to 6.5 to carry out vanadium precipitation, then filter to obtain vanadium precipitate and waste water, the concentration of TV in the waste water is 0.06g / L;

[0087] (3) According to the liquid-solid ratio of the sodium hydroxide solution and the vanadium precipitate, it is 14mL / g to add 400mL of sodium hydroxide solution (the content of NaOH is 100g / L) in the vanadium precipitate, feed into the air, under th...

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Abstract

The invention relates to the technical field of extraction metallurgy, and discloses a method for recovering vanadium from calcified vanadium extraction tailings. The method comprises the following steps: (1) adding the calcified vanadium extraction tailings and calcium sulfite into water for pulping, then adding sulfuric acid for leaching, adjusting the pH value of a system to 2-3 by using lime and / or limestone after the leaching is finished, and then carrying out solid-liquid separation to obtain residues and a leaching solution; (2) adjusting the pH value of the leachate to 5.5-7 by using magnesium carbonate and / or manganese carbonate to precipitate vanadium, and then filtering to obtain vanadium precipitate and wastewater; (3) adding a sodium hydroxide solution and an oxidizing agent into the vanadium precipitate for reaction, performing solid-liquid separation after reaction to obtain filtrate A and filter residue A, and controlling the weight ratio of vanadium element to phosphorus element in the filtrate A to be greater than or equal to 600; and (4) calcium oxide is added into the filtrate A for vanadium precipitation, and filtrate B and filter residues B are obtained through solid-liquid separation. According to the method, the vanadium in the calcified vanadium extraction tailings can be effectively recycled, and the vanadium loss in the vanadium extraction process can be reduced.

Description

technical field [0001] The invention relates to the technical field of vanadium extraction metallurgy, in particular to a method for recovering vanadium from calcified vanadium extraction tailings. Background technique [0002] Vanadium slag is the main raw material for the production of vanadium oxide. At present, there are two industrial processes: sodium roasting-water leaching vanadium extraction and calcification roasting-acid leaching vanadium extraction. Among them, the vanadium slag calcification roasting-acid leaching vanadium extraction process is that the vanadium slag and limestone are mixed and roasted at high temperature, and the obtained calcified clinker is leached with dilute sulfuric acid at pH=2.8-3.0, so that vanadium dissolves into the solution, and further ammonium salt Precipitate vanadium to prepare vanadium oxide. In the actual production process, the vanadium content of the vanadium extraction tailings generated by this process is 1.2% to 1.7%, whi...

Claims

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Application Information

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IPC IPC(8): C22B34/22C22B7/00
CPCY02P10/20
Inventor 付自碧申彪叶露饶玉忠
Owner PANGANG GROUP RESEARCH INSTITUTE CO LTD
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