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Method for directly preparing vanadium oxide from vanadium-containing liquid

A vanadium oxide and vanadium liquid technology, which is applied in the fields of hydrometallurgy and vanadium chemical industry, can solve the problems of low conversion rate of raw materials, low product purity, complicated preparation process, etc., and achieves simplified process flow, reduced reagent consumption, and energy saving. consumption effect

Active Publication Date: 2017-01-04
HEBEI IRON AND STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Aiming at the problems of low conversion rate of raw materials, low product purity, complex preparation process and high energy consumption in the existing preparation process, the present invention provides a method for directly preparing vanadium oxide by utilizing vanadium-containing liquid

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  • Method for directly preparing vanadium oxide from vanadium-containing liquid

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Embodiment 1

[0051] This embodiment provides a method for directly preparing vanadium oxides from a vanadium-containing liquid, the method comprising the following steps:

[0052] (1) Add calcium additives to the vanadium-containing liquid of sodium roasting-water leaching vanadium-containing liquid to remove impurities from silicon and phosphorus, and then add calcium oxide to the vanadium-containing liquid after impurity removal to carry out calcification and vanadium precipitation reaction, and obtain vanadium by solid-liquid separation Calcium acid solid and vanadium precipitation mother liquor;

[0053] (2) Mix the calcium vanadate solid obtained in step (1) with oxalic acid evenly, add deionized water to prepare a reaction slurry, conduct a heating reaction at 80°C for 1 hour, and separate the solid and liquid after the reaction to obtain vanadyl oxalate solution and calcium oxalate solid ;

[0054] (3) adding a concentration of 450g / L sodium hydroxide aqueous solution to the vanady...

Embodiment 2

[0058] This embodiment provides a method for directly preparing vanadium oxides from a vanadium-containing liquid, the method comprising the following steps:

[0059] (1) Add calcium additives to the vanadium-containing liquid of sodium roasting-water leaching vanadium-containing liquid to remove impurities from silicon and phosphorus, and then add calcium oxide to the vanadium-containing liquid after impurity removal to carry out calcification and vanadium precipitation reaction, and obtain vanadium by solid-liquid separation Calcium acid solid and vanadium precipitation mother liquor;

[0060] (2) Mix the calcium vanadate solid obtained in step (1) with oxalic acid evenly, add deionized water to prepare a reaction slurry, conduct a heating reaction at 80°C for 1 hour, and separate the solid and liquid after the reaction to obtain vanadyl oxalate solution and calcium oxalate solid ;

[0061] (3) Adding a concentration of 500g / L sodium hydroxide aqueous solution to the vanady...

Embodiment 3

[0065] This embodiment provides a method for directly preparing vanadium oxides from a vanadium-containing liquid, the method comprising the following steps:

[0066] (1) Add calcium additives to the vanadium-containing liquid of sodium roasting-water leaching vanadium-containing liquid to remove impurities from silicon and phosphorus, and then add calcium oxide to the vanadium-containing liquid after impurity removal to carry out calcification and vanadium precipitation reaction, and obtain vanadium by solid-liquid separation Calcium acid solid and vanadium precipitation mother liquor;

[0067] (2) Mix the calcium vanadate solid obtained in step (1) with oxalic acid evenly, add deionized water to prepare a reaction slurry, conduct a heating reaction at 80°C for 1 hour, and separate the solid and liquid after the reaction to obtain vanadyl oxalate solution and calcium oxalate solid ;

[0068] (3) Adding a concentration of 550g / L potassium hydroxide aqueous solution to the van...

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Abstract

The invention provides a method for directly preparing vanadium oxide from vanadium-containing liquid. The method comprises the following steps that 1, calcium oxide is added into the vanadium-containing liquid obtained after impurity removal for a calcification molybdenum precipitation reaction, and solid-liquid separation is carried out to obtain calcium orthovanadate solids and molybdenum precipitation mother liquor; 2, after the calcium orthovanadate solids and oxalic acid are mixed to be uniform, water is added, reaction slurry is prepared for a heating reaction, and solid-liquid separation is carried out after reacting to obtain a vanadyl oxalate solution and calcium oxalate solids; 3, an alkali metal hydroxide water solution and / or ammonium hydroxide are / is added into the vanadyl oxalate solution for reacting, and solid-liquid separation is carried out after reacting to obtain vanadium hydroxide solids; 4, the vanadium hydroxide solids are calcined to prepare vanadium oxide. According to the method, the vanadium-containing liquid is utilized, vanadium oxide is directly prepared from oxalic acid, the conversion rate of the raw materials is high, meanwhile, the purity of the obtained product can be guaranteed, the process is simple, and cost is low.

Description

technical field [0001] The invention belongs to the fields of hydrometallurgy and vanadium chemical industry, and relates to a method for vanadium oxides, in particular to a method for directly preparing vanadium oxides by using vanadium-containing liquid. Background technique [0002] Vanadium dioxide exists in various forms of stable and metastable allotropes, and is a typical phase change compound. At the same time as the phase transition occurs, the conductivity, infrared light transmittance, reflectivity and resistance of vanadium dioxide will all undergo sudden changes. This unique property makes it a hot spot in the research of energy-saving materials, and is widely used in smart window materials, gas sensors, photoelectric switches, and infrared detectors. [0003] In 2012, the research group of Academician Xie Yi of the University of Science and Technology of China used PVP as the surfactant to control the synthesis of core-shell vanadium dioxide D-phase microspher...

Claims

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Application Information

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IPC IPC(8): C22B3/44C22B34/22
CPCC22B3/44C22B34/22Y02P10/20
Inventor 李兰杰常福增王海旭白瑞国徐从美周欣
Owner HEBEI IRON AND STEEL
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