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Method for extracting chromium and vanadium from vanadium slag at low temperature and normal pressure

A low temperature and normal pressure vanadium slag technology, applied in the field of extracting vanadium and chromium from vanadium slag at low temperature and normal pressure, can solve the problems of low oxygen solubility, lower temperature and energy consumption, and ineffective alkaline solution aeration method, etc.

Active Publication Date: 2016-03-16
INST OF PROCESS ENG CHINESE ACAD OF SCI +1
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Problems solved by technology

CN101812588A proposes a method for decomposing vanadium slag with potassium hydroxide solution under normal pressure. It reacts at 180-260°C, the temperature is greatly reduced, and co-extraction of vanadium and chromium can be realized. The disadvantage is that the cost of potassium hydroxide medium is high, and the generated vanadium Potassium acid is not an industrial product and needs further separation and purification
CN102127655A proposes a method for decomposing vanadium slag with NaOH solution under normal pressure. The reaction temperature is 180-260°C. Compared with the roasting process, the temperature and energy consumption of the vanadium extraction process are significantly reduced, and the efficiency of vanadium extraction is significantly increased. However, due to the high alkali concentration of 80 %, the evaporation of circulating lye consumes a lot of energy, and the conventional gas distribution method is used to oxidize and dissolve oxygen with low solubility and slow diffusion, so it is impossible to realize the co-extraction of vanadium and chromium; CN102534232A proposes a method for carbon medium-enhanced oxidation of vanadium slag in an alkaline solution system , using the adsorption of activated carbon on oxygen, the diffusion of oxygen in high alkali solution can be strengthened by adding activated carbon, and vanadium chromium can be realized at a lower alkali concentration (below 75%) and a lower reaction temperature (200-225°C). Co-existence
[0006] Alkaline solution aeration method not yet effective

Method used

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  • Method for extracting chromium and vanadium from vanadium slag at low temperature and normal pressure

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] (1) Ingredients: In a 15L reactor, add 2kg of vanadium slag and 40wt% NaOH solution, wherein the vanadium slag contains V 2 o 5 8.3wt%, Cr 2 O33.41%, the mass ratio of alkali ore is 2:1;

[0069] (2) Reaction: Stir and heat the slurry prepared in step (1) to 120°C, put a microporous aeration head at the bottom of the normal pressure reactor, connect the aeration head to a pressure-resistant metal hose, Air was blown into the kettle. The aerator head is a rod-shaped structure with a diameter of 20mm and a length of 100mm, which is fired from titanium alloy powder and has an average pore diameter of 20μm. The gas distribution pressure of the micropores is 0.3MPa, the gas flow rate is 0.4L / min, the gas temperature is 80°C, and it is heated by a hot blast stove. Insulation reaction for 4 hours, so that the vanadium slag can fully react with oxygen, and finally get NaOH, Na 3 VO 4 、Na 2 CrO 4 、Na 2 SiO 4 The conversion rates of vanadium and chromium in solutions su...

Embodiment 2

[0076] (1) Ingredients: In a 15L reactor, add 2kg of vanadium slag and 50wt% NaOH solution, wherein the vanadium slag contains V 2 o 5 8.3wt%, Cr 2 O33.41%, the mass ratio of alkali ore is 2.5:1;

[0077] (2) Reaction: Stir and heat the slurry prepared in step (1) to 130°C, put a microporous aeration head at the bottom of the normal pressure reactor, connect the aeration head to a pressure-resistant metal hose, Air was blown into the kettle. The aerator head is a hemispherical structure with a diameter of 100mm and a micropore diameter of 30μm, which is fired from nickel alloy powder. Micropore air distribution pressure is 0.8MPa, gas flow rate is 0.6L / min, gas temperature is 120°C, and is heated by a hot blast stove. Insulation reaction for 5 hours, so that the vanadium slag can fully react with oxygen, and finally get NaOH, Na 3 VO 4 、Na 2 CrO 4 、Na 2 SiO 4 The conversion rates of vanadium and chromium in solutions such as iron-rich tailings and vanadium slag are 9...

Embodiment 3

[0085] (1) Ingredients: In a 15L reactor, add 2kg of vanadium slag and 60wt% NaOH solution, wherein the vanadium slag contains V 2 o 5 8.3wt%, Cr 2 O33.41%, the mass ratio of alkali ore is 2.5:1;

[0086] (2) Reaction: Stir and heat the slurry prepared in step (1) to 125°C, put a microporous aeration head at the bottom of the normal pressure reactor, connect the aeration head with a pressure-resistant metal hose, Oxygen-enriched air (oxygen content is 40%) is blown into the kettle. The aerator head is a box-shaped structure with length, width and height of 50mm, 25mm and 15mm respectively, and is made of nickel alloy powder. The gas distribution pressure of the micropores is 0.8MPa, the gas flow rate is 0.3L / min, the gas temperature is 145°C, and it is heated by a hot blast stove. Keeping the temperature for 3 hours, so that the vanadium slag can fully react with oxygen, and finally get NaOH, Na 3 VO 4 、Na 2 CrO 4 、Na 2 SiO 4 The conversion rates of vanadium and chro...

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Abstract

The invention relates to the field of vanadium slag hydrometallurgy and vanadium chemical engineering, in particular to a method for extracting chromium and vanadium from vanadium slag at a low temperature and the normal pressure. The method comprises the following steps that firstly, burdening, wherein the vanadium slag and a NaOH solution are mixed to form reaction slurry; secondly, reaction, oxide gas is led into the reaction slurry through a micro-hole arrangement device to carry out normal-pressure oxidative leaching, and after the reaction, solid-liquid mixed slurry of a solution containing NaOH, Na3VO4, Na2CrO4, water soluble impurity components and iron-rich tailings is obtained; thirdly, solid-liquid separation; fourthly, impurity removing; fifthly, sodium vanadate crystallization; and sixthly, sodium chromate crystallization. According to the method, chromium and vanadium efficient common extraction can be achieved, the extraction efficiency of both chromium and vanadium can be higher than 85%, more importantly, after the micro-hole gas distribution manner is adopted, the oxygen solubility can be obviously improved, the reaction temperature and alkali concentration are obviously reduced compared with those of an existing vanadium extraction method, the operation safety is greatly improved, and reaction energy consumption is reduced.

Description

technical field [0001] The invention relates to the fields of vanadium slag hydrometallurgy and vanadium chemical industry, in particular to a method for extracting vanadium and chromium in vanadium slag at low temperature and normal pressure. Background technique [0002] Vanadium slag is a vanadium-enriched material produced by blowing vanadium-containing molten iron in the presence of oxygen-containing gas. In the iron and steel industry, vanadium slag produced from vanadium-titanium magnetite is the main raw material for vanadium extraction. Enterprises that use vanadium-titanium magnetite as raw materials to produce iron and vanadium products currently use the traditional vanadium slag sodium roasting process to extract vanadium from vanadium slag, such as my country's Panzhihua Iron and Steel Corporation, Chenggang Iron and Steel Co., Ltd. in South Africa, and New Zealand Iron and Steel Co., Ltd. company etc. The basic principle of the sodium roasting process is based ...

Claims

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Application Information

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IPC IPC(8): C22B34/22C22B34/32
CPCC22B34/22C22B34/32
Inventor 杜浩郑诗礼刘彪王少娜刘龙杰张懿王海旭李兰杰高明磊陈东辉白瑞国
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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