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Method for preparing vanadium pentoxide from high-chrome vanadium slag

A vanadium pentoxide and high-chromium technology, applied in the field of vanadium chemical technology and resource recycling, can solve problems such as reducing production costs and pollution, and achieve the effects of avoiding water pollution, less ammonium salt consumption, and saving production costs.

Active Publication Date: 2019-01-08
NORTHEASTERN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the above-mentioned problems in the prior art, the present invention provides a method for preparing vanadium pentoxide by using high-chromium vanadium slag, which can realize the efficient separation and extraction of vanadium and chromium in high-chromium vanadium slag, and simultaneously Utilize, solve the problem of water pollution, and reduce the production cost

Method used

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  • Method for preparing vanadium pentoxide from high-chrome vanadium slag

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Embodiment 1

[0034] A method for preparing vanadium pentoxide by using high chromium type vanadium slag, the process flow is as follows figure 1 shown, including the following steps:

[0035] (1) Roasting: Grind and sieve the high-chromium vanadium slag, add calcium oxide for mixing, and then perform calcification and roasting. The particle size of the high-chromium vanadium slag is 150-300 mesh, so as to facilitate the oxidation of vanadium in the vanadium slag. Calcification. Among them, the vanadium content of the high chromium type vanadium slag used (in V 2 o 5 Calculated) is 14.42%, chromium content (as Cr 2 o 3 Calculated) is 9.45%, mixes evenly with calcium oxide, by molar ratio, calcium oxide: V in vanadium slag 2 o 5 =1; Roasting at 900°C for 60 minutes to obtain roasted clinker; the particle size of the roasted clinker after crushing is 250-300 mesh.

[0036] (2) Leaching: the roasted clinker obtained in step (1) is placed in (NH 4 ) 2 SO 4 -H 2 SO 4 Leach in the col...

Embodiment 2

[0042] A method for preparing vanadium pentoxide by utilizing high chromium type vanadium slag, comprising the steps of:

[0043] (1) Roasting: Grind and sieve the high-chromium vanadium slag, add calcium carbonate for mixing, and then calcify and roast. Calcification. Among them, the vanadium content of the high chromium type vanadium slag used (in V 2 o 5 Calculated) is 10.38%, chromium content (as Cr 2 o 3 Calculated) is 13.27%, mixes evenly with calcium carbonate, by molar ratio, calcium carbonate: V in the vanadium slag 2 o 5 =2. Roasted at 850°C for 180 minutes to obtain roasted clinker; the crushed particle size of the roasted clinker was 250-300 mesh.

[0044] (2) Leaching: (NH4) 2 SO 4 -H 2 SO 4 The synergistic leaching system consists of 50g / L (NH 4 ) 2 SO 4 solution and 20% volume fraction of H 2 SO 4 The solution constitutes, where (NH 4 ) 2 SO 4 solution with H 2 SO 4 The volume ratio of solution is 60; The roasted clinker that step (1) obtains...

Embodiment 3

[0050] A method for preparing vanadium pentoxide by utilizing high chromium type vanadium slag, comprising the steps of:

[0051] (1) Roasting: Grind and sieve the high-chromium vanadium slag, add calcium oxide for mixing, and then calcify and roast. The particle size of the high chromium vanadium slag is 150-300 mesh, so as to facilitate the oxidation and calcification of vanadium in the vanadium slag. Among them, the vanadium content of the high chromium type vanadium slag used (in V 2 o 5 Calculated) is 11.97%, chromium content (as Cr 2 o 3 Calculated) is 10.24%, mixes evenly with calcium oxide, by molar ratio, calcium oxide: V in the vanadium slag 2 o 5 = 3.5. Roasting at 850°C for 120 minutes to obtain roasted clinker; the crushed particle size of the roasted clinker is 250-300 mesh.

[0052] (2) Leaching: (NH 4 ) 2 SO 4 -H 2 SO 4 The synergistic leaching system consists of 250g / L (NH 4 )2 SO 4 solution and 20% volume fraction of H 2 SO 4 The solution cons...

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Abstract

The invention relates to a method for preparing vanadium pentoxide from high-chrome vanadium slag. The method comprises the following steps: mixing the high-chrome vanadium slag with calcium salt to obtain a mixed material, roasting the mixed material at high temperature to obtain a roasted clinker; leaching the roasted clinker under a leaching medium, namely a (NH4)2SO4-H2SO4 collaborative system, filtering and separating a solid from liquid, and obtaining vanadium-containing leachate and chrome-containing leachate; adjusting the pH value and temperature of the vanadium-containing leachate toprecipitate vanadium, and filtering and separating a solid from liquid, and obtaining ammonium vanadate precipitates and vanadium precipitated supernate; roasting the ammonium vanadate precipitates to obtain ammonium vanadate precipitates, thus preparing a vanadium pentoxide product; and circulating the vanadium precipitated supernate back into a leaching system as a leaching medium. The method disclosed by the invention realizes efficient separation of chrome vanadium in the high-chrome vanadium slag; the purity of the prepared vanadium pentoxide is relatively high, and the obtained vanadiumprecipitated supernate can be circulated back into the leaching process for utilization; cyclic utilization of vanadium precipitated ammonia-nitrogen wastewater is realized; water pollution is avoided; and the production cost is effectively reduced.

Description

technical field [0001] The invention relates to a method for preparing vanadium pentoxide from high-chromium vanadium slag, and belongs to the technical field of vanadium chemical technology and resource recycling technology. Background technique [0002] Vanadium and chromium are important rare metals, and their compounds are widely used in metallurgy, chemical industry, building materials and many other fields. High-chromium vanadium slag is a by-product of the smelting process of high-chromium vanadium-titanium magnetite, in which both vanadium and chromium have relatively high grades, so it is a potential raw material for extracting vanadium and chromium. However, there are two limiting factors in the process of separating and extracting vanadium and chromium from high-chromium vanadium slag: one is that it is difficult to separate vanadium and chromium due to the similar properties of vanadium and chromium; Difficult to deal with waste water and waste residue. Therefo...

Claims

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Application Information

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IPC IPC(8): C22B1/02C22B7/04C22B34/32C01G31/02
CPCC01G31/02C01P2006/80C22B1/02C22B7/008C22B7/04C22B34/32Y02P10/20
Inventor 姜涛温婧高慧阳薛向欣
Owner NORTHEASTERN UNIV
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