Method for preparing ammonium metavanadate from vanadium-containing material

A technology of ammonium metavanadate and sodium metavanadate, which is applied in the field of vanadium hydrometallurgy, can solve the problems of difficult recovery, high environmental pollution, and high corrosion resistance requirements, and achieve reduced production costs, reduced environmental pollution, and equipment less demanding effect

Inactive Publication Date: 2016-10-05
HUZHOU OCHEM CHEM
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

But there are following weak points in this method: (1) sodium hydroxide, bell hydroxide are strong bases, and equipment corrosion is serious and recovery difficulty is bigger; (2) the vanadium slag after strong base treatment, owing to containing sodium, potassium, It brings great difficulties to tailings treatment and wastewater treatment
But this process has the following disadvantages: (1) the leaching time is long, and the acid consumption is relatively large, and every ton of vanadium pentoxide will consume 81 tons of sulfuric acid, and it cannot be recycled; (2) sulfuric acid has strong corrosion under heating conditions It has high requirements for corrosion resistance of equipment and is unsafe in production; (3) Sulfur dioxide is produced during the production process, which will cause serious pollution problems and operator poisoning.
Although this process reduces material consumption and does not emit waste gas, it also has the following defects: (1) acid leaching requires high corrosion resistance of equipment; (2) waste water treatment costs are relatively large
However, due to the addition of sodium salt (soda, salt) in the process of traditional sodium roasting and water leaching vanadium extraction process, corrosive gases (HCl, Cl 2 , SO 2 , SO 3 etc.) causing serious pollution to the environment

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  • Method for preparing ammonium metavanadate from vanadium-containing material

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Experimental program
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Effect test

Embodiment 1

[0032] (1) Crushing and milling: the vanadium slag containing 8.17% by mass of vanadium and 28.40% by mass of iron is ball milled to a particle size of 150 mesh powder after crushing;

[0033] (2) Mixing: get 40.00g of above-mentioned vanadium slag powder and mix with 10.00g sodium carbonate;

[0034] (3) Roasting: put the above materials in a tube furnace, rise from room temperature to 700°C for 60 minutes, then rise to 750°C for 60 minutes, then rise to 860°C for 160 minutes and keep at 860°C for 60 minutes;

[0035] (4) Ball milling: take out the above-mentioned roasted clinker when it is cooled to about 790°C, place it in a ball mill jar, add water of the same quality as the vanadium slag, and then ball mill it for 2 hours;

[0036] (5) Water immersion and suction filtration: immerse the above-mentioned ball-milled slurry in water, the leaching temperature is 75°C, and the leaching time is 60min, then suction filtration while it is hot, and wash twice with 15ml water;

[00...

Embodiment 2

[0040] (1) Crushing and milling: the vanadium slag containing 8.17% by mass of vanadium and 28.40% by mass of iron is ball milled to a powder with a diameter of 150 mesh after crushing;

[0041] (2) Mixing: get the above-mentioned vanadium slag powder 40.00g and mix evenly with 11.00g sodium carbonate;

[0042] (3) Roasting: put the above materials in a tube furnace, rise from room temperature to 700°C for 60 minutes, then rise to 750°C for 60 minutes, then rise to 880°C for 160 minutes and keep at 880°C for 60 minutes;

[0043] (4) Ball milling: take out the above-mentioned roasted clinker when it is cooled to about 790°C, place it in a ball mill jar, add water of the same quality as the vanadium slag, and then ball mill it for 2 hours;

[0044] (5) Water immersion and suction filtration: soak the above ball milled slurry in water, the leaching temperature is 75°C, and the leaching time is 60min, then suction filter while it is hot, and wash twice with 15ml water;

[0045] (...

Embodiment 3

[0048] (1) Batching: the filtrate after the suction filtration in the embodiment 2 step (6) is mixed with 150 purpose vanadium slag raw materials (V: 8.17%, Fe: 28.40%) and 4.40g sodium carbonate and then dried;

[0049] (2) Roasting: put the above materials in a tube furnace, rise from room temperature to 700°C for 60 minutes, then rise to 750°C for 60 minutes, then rise to 880°C for 160 minutes and keep at 880°C for 60 minutes;

[0050] (3) Ball milling: take out the above-mentioned roasted clinker when it is cooled to about 790°C, place it in a ball mill jar, add water of the same quality as the vanadium slag, and then ball mill it for 2 hours;

[0051] (4) Water immersion and suction filtration: Soak the above-mentioned ball-milled slurry in water, the leaching temperature is 75°C, and the leaching time is 60min, then suction filter while it is hot, and wash twice with 15ml water each, and combine the filtrates obtained from the three suction filtration ;

[0052] (5) Con...

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Abstract

The invention provides a method for preparing ammonium metavanadate from vanadium-containing material. The method comprises the steps of a, mixing the vanadium-containing material and sodium modifying agents, roasting the mixtures and then soaking the mixtures in water for forming solutions containing the sodium metavanadate; b, adding ammonium source substances into the solutions containing the sodium metavanadate, guiding CO2 into the solutions and obtaining NH4VO3 through sediment; c, separating the NH4VO3 obtained through sediment from mother solutions for obtaining the NH4VO3; and d, mixing the mother solutions subjected to separation in the step c with new vanadium-containing material and the sodium modifying agents, repeating the step a, the step b and the step c and preparing the ammonium metavanadate from the new vanadium-containing material. According to the method for preparing the ammonium metavanadate from the vanadium-containing material, no waste water is generated, waste liquid can be recycled, and therefore the production cost can be lowered, and the environmental pollution can be reduced; the yield of vanadium is high.

Description

technical field [0001] The invention belongs to the technical field of vanadium hydrometallurgy, and relates to a method for preparing ammonium metavanadate from a vanadium-containing material. Background technique [0002] The vanadium-containing materials mentioned in the present invention mainly include vanadium slag, stone coal, waste vanadium-containing catalyst and the like. Among them, vanadium slag refers to a kind of slag rich in vanadium oxides and iron oxides after the molten iron containing vanadium is oxidized by converter blowing and other methods. The vanadium in it exists in the form of water-insoluble minerals and is the main raw material for recovering vanadium. one. [0003] At present, the methods for extracting vanadium from vanadium-containing slag mainly include: sodium hydroxide sub-molten salt vanadium extraction method, calcification roasting-acid leaching vanadium extraction method, blank roasting vanadium extraction method and sodium roasting van...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B34/22
Inventor 徐贝周小平
Owner HUZHOU OCHEM CHEM
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