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A kind of method for extracting vanadium and chromium in vanadium slag at low temperature and normal pressure

A low-temperature, normal-pressure, vanadium-slag technology, applied in the field of low-temperature and normal-pressure extraction of vanadium and chromium from vanadium slag, can solve the problems of inability to achieve co-extraction of vanadium and chromium, ineffective alkaline solution aeration method, and large energy consumption for evaporation of circulating lye And other issues

Active Publication Date: 2018-07-03
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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  • A kind of method for extracting vanadium and chromium in vanadium slag at low temperature and normal pressure

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Experimental program
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Effect test

Embodiment 1

[0068] (1) Ingredients: In a 15L reactor, add 2kg vanadium slag and 40wt% NaOH solution, where the vanadium slag contains V 2 O 5 8.3wt%, Cr 2 O 33.41%, the mass ratio of alkali-ore is 2:1;

[0069] (2) Reaction: The slurry prepared in step (1) is stirred and heated to 120°C, and a microporous aeration head is placed at the bottom of the normal pressure reactor. The aeration head is connected with a pressure-resistant metal hose, and the air compressor Air is blown into the kettle. The aeration head has a rod-like structure with a diameter of 20mm and a length of 100mm, which is fired from titanium alloy powder, with an average micropore diameter of 20μm. The microporous air distribution pressure is 0.3MPa, the gas flow rate is 0.4L / min, and the gas temperature is 80°C. It is heated by a hot air stove. Incubate for 4 hours to fully react the vanadium slag with oxygen, and finally obtain NaOH and Na 3 VO 4 , Na 2 CrO 4 , Na 2 SiO 4 The conversion rates of vanadium and chromium in...

Embodiment 2

[0076] (1) Ingredients: In a 15L reactor, add 2kg vanadium slag and 50wt% NaOH solution, where the vanadium slag contains V 2 O 5 8.3wt%, Cr 2 O 33.41%, the mass ratio of alkali-ore is 2.5:1;

[0077] (2) Reaction: The slurry prepared in step (1) is stirred and heated to 130°C, and a microporous aeration head is placed at the bottom of the normal pressure reactor. The aeration head is connected with a pressure-resistant metal hose, and the air compressor Air is blown into the kettle. The aeration head is a hemispherical structure with a diameter of 100mm and a micropore diameter of 30μm, which is made of nickel alloy powder. The microporous air distribution pressure is 0.8MPa, the gas flow rate is 0.6L / min, and the gas temperature is 120°C. It is heated by a hot air stove. Incubate and react for 5 hours to fully react the vanadium slag with oxygen, and finally obtain NaOH and Na 3 VO 4 , Na 2 CrO 4 , Na 2 SiO 4 The conversion rates of vanadium and chromium in vanadium slag and i...

Embodiment 3

[0085] (1) Ingredients: In a 15L reactor, add 2kg vanadium slag and 60wt% NaOH solution, where the vanadium slag contains V 2 O 5 8.3wt%, Cr 2 O 33.41%, the mass ratio of alkali-ore is 2.5:1;

[0086] (2) Reaction: The slurry prepared in step (1) is stirred and heated to 125°C, and a microporous aeration head is placed at the bottom of the normal pressure reactor. The aeration head is connected with a pressure-resistant metal hose, and the air compressor Oxygen-enriched air (40% oxygen content) is blown into the kettle. The aeration head has a rectangular box-like structure with length, width and height of 50mm, 25mm, and 15mm, respectively, and is made of nickel alloy powder. The microporous air distribution pressure is 0.8MPa, the gas flow rate is 0.3L / min, and the gas temperature is 145°C. It is heated by a hot air stove. Keep holding for 3h to make the vanadium slag and oxygen fully react, and finally get NaOH, Na 3 VO 4 , Na 2 CrO 4 , Na 2 SiO 4 The conversion rates of vana...

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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 field of vanadium slag hydrometallurgy and vanadium chemical industry, in particular to a method for extracting vanadium and chromium from vanadium slag at low temperature and normal pressure. Background technique [0002] Vanadium slag is a vanadium-enriched material produced from vanadium-containing molten iron in the presence of oxygen-containing gas. Vanadium slag produced from vanadium-titanium magnetite in the iron and steel industry is the main raw material for vanadium extraction. Companies that use vanadium-titanium magnetite as raw materials to produce iron and vanadium products are currently using traditional vanadium slag sodium roasting process to extract vanadium from vanadium slag, such as my country's Panzhihua Iron and Steel, Chenggang, South Africa's Heveld and New Zealand Steel Company etc. The basic principle of sodium roasting process is based on Na 2 CO 3 As an additive, low-valent vanadium is converted int...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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