Efficient vanadium extraction method by performing alkali roasting on vanadium mineral

A mineral and roasting technology, which is applied in the field of high-efficiency vanadium extraction by alkaline roasting of vanadium-containing minerals, can solve the problems of toxic gas acidic ammonia nitrogen wastewater, low vanadium conversion rate recovery rate, low vanadium recovery rate, etc., to achieve high-efficiency leaching and avoid oxidation wrapping And the effect of leaching resistance and saving binder

Active Publication Date: 2013-05-08
HEBEI IRON AND STEEL
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The recovery rate of vanadium in the sodium roasting process is low, the recovery rate of vanadium in a single roasting is about 70%, and the recovery rate of vanadium after multiple roasting is only 80%; the roasting temperature is high (750-850 ° C), and multiple roasting is required , high energy consumption; in the roasting process will produce harmful HCl, Cl 2 and other

Method used

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  • Efficient vanadium extraction method by performing alkali roasting on vanadium mineral

Examples

Experimental program
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Effect test

Embodiment 1

[0018] Example 1: figure 1 As shown, the process steps of the method for efficiently extracting vanadium by alkaline roasting of vanadium-containing minerals are as follows.

[0019] (1) Ingredients: 1kg of vanadium-titanium magnetite and 100g of NaOH are pelletized in a disc granulator to obtain pellets; among them, vanadium-titanium magnetite contains V 2 o 5 1.2wt%, SiO 2 6.5wt%;

[0020] (2) Reaction: Put the pellets into a box kiln and heat them to 350°C for 5 hours. After the reaction, the low-valent vanadium is oxidized to pentavalent and reacts with NaOH to form sodium vanadate to obtain roasted clinker;

[0021] (3) Leaching: leaching the roasted clinker obtained in step (2) in water at 80°C, roasted clinker:water=5:1 (weight); then filter to obtain leaching residue and vanadium-containing eluate;

[0022] (4) Impurity removal: adding a conventional aluminum desiliconization agent to the eluate obtained in step (3) for desiliconization, and filtering to obtain t...

Embodiment 2

[0025] Example 2: The process steps of the method for efficiently extracting vanadium by alkaline roasting of vanadium-containing minerals are as follows.

[0026] (1) Ingredients: 1kg of vanadium slag and 500g of NaOH are pelletized in a disc granulator to obtain pellets; among them, the vanadium slag contains V 2 o 5 12wt%, SiO 2 20wt%;

[0027] (2) Reaction: Put the pellets into a pusher kiln, heat them in oxygen to 500°C for 3 hours, after the reaction, the low-valent vanadium is oxidized to pentavalent and reacts with NaOH to form sodium vanadate to obtain roasted clinker;

[0028] (3) Leaching: Leach the roasted clinker obtained in step (2) in 90°C, 300g / L NaOH solution, the liquid-solid ratio is 5:1 (by weight); then filter to obtain leaching slag and vanadium-containing eluate ;

[0029] (4) Impurity removal: add a conventional calcium desiliconization agent to the eluate obtained in step (3) to remove impurities, and filter to obtain the impurity-removed residue...

Embodiment 3

[0032] Example 3: The process steps of the method for efficiently extracting vanadium by alkaline roasting of vanadium-containing minerals are as follows.

[0033] (1) Ingredients: 1000g of vanadium extraction tailings and 300g of KOH are pelletized in a disc granulator to obtain pellets; among them, the vanadium extraction tailings contain V 2 o 5 2wt%, SiO 2 20wt%;

[0034] (2) Reaction: Put the pellets into the rotary kiln and heat them in oxygen-enriched air to 700°C for 1 hour. After the reaction, the vanadium oxide reacts with KOH to form potassium vanadate to obtain roasted clinker;

[0035] (3) Leaching: Leach the roasted clinker obtained in step (2) in 50°C, 600g / L KOH solution, the liquid-solid ratio is 5:1 (by weight); then filter to obtain leaching slag and vanadium-containing eluate ;

[0036] (4) Impurity removal: add calcium desiliconization agent to the eluate obtained in step (3) to remove impurities, and filter to obtain the impurity-removed residue and...

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Abstract

The invention discloses an efficient vanadium extraction method by performing alkali roasting on vanadium mineral. The method comprises the following processing steps of: (1) mixing the vanadium mineral with sodium hydroxide or potassium hydroxide for pellet fabrication, and oxidizing and roasting pellets at the temperature of 300-700 DEG C to obtain roasted clinker; (2) leaching the roasted clinker using water or aqueous alkali corresponding to the step 1, and then carrying out solid-liquid separation to obtain leaching residue and a vanadium dissolution solution; and (3) cooling and crystallizing silicon-removed vanadium digestion solution to obtain vanadate. The alkali roasting is used by the method provided by the invention, because alkali can function as a caking agent in the aggregating process, the caking agent can be saved; not only is the roasting temperature reduced largely and process flow largely shortened, but also no waste gas, ammonia-nitrogen wastewater and the like are discharged, as well as a leachate can be recycled; and a silicate phase can be directly destroyed to promote the destroy and the oxidization of a vanadium phase, and the oxidative enveloping and the leaching hindering of the silicate phase to the vanadium can be prevented so that the efficient vanadium leaching can be realized and the leaching rate can reach more than 95%.

Description

technical field [0001] The invention belongs to the technical field of vanadium chemical metallurgy, in particular to a method for efficiently extracting vanadium by alkaline roasting of vanadium-containing minerals. Background technique [0002] Vanadium-containing minerals generally include vanadium-titanium magnetite, vanadium slag, vanadium extraction tailings, stone coal, siliceous rock vanadium ore and other vanadium-containing gangue ores and smelted vanadium-containing slag. Vanadium-titanium magnetite and stone coal are mainly used as raw materials for extracting vanadium in my country's vanadium chemical industry. Among them, the main components of the iron ore concentrate obtained after magnetic separation of vanadium-titanium magnetite are iron and titanium, and the grade of vanadium in the ore is very low, about 0.5% to 0.8%. At present, there are two main methods for extracting vanadium from iron concentrates, one is to extract vanadium directly from iron conc...

Claims

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Application Information

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IPC IPC(8): C22B1/02C22B34/22
CPCY02P10/20
Inventor 李兰杰陈东辉白瑞国王少娜石立新陈育红
Owner HEBEI IRON AND STEEL
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