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A method for the deep separation of vanadium in molybdates using magnetic iron oxide as an adsorbent

Active Publication Date: 2019-01-08
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the addition of manganese salts and iron salts in the above method inevitably brings in impurities, and the generated colloidal manganese dioxide and hydrated iron oxide make solid-liquid separation extremely difficult.

Method used

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  • A method for the deep separation of vanadium in molybdates using magnetic iron oxide as an adsorbent

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] In the vanadium-containing sodium molybdate solution, Mo=50g / L, V=0.5g / L, pH control is 9.0, and new Fe is added 3 O 4 The mass ratio of Fe in the sol to vanadium in the solution is 70. The adsorption reaction was carried out under the conditions of a temperature of 25°C and a stirring time of 1 hour. After the reaction, the solid-liquid was completely separated under the action of an external magnetic field for 10 seconds, and the magnetic field intensity was 0.35T. The solution contains Mo=48.3g / L, V=0.012 g / L; the loaded adsorbent is desorbed with 1mol / L NaOH solution, the desorption rate of molybdenum is 95.4%, the desorption rate of vanadium is 98.5%, the adsorbent after desorption can continue to use. Such as figure 1 Shown are the magnetic performance curves of the prepared adsorbent and a schematic diagram of solid-liquid separation under the action of an external magnetic field after adsorption. It can be seen that the saturation magnetization of the adsorbent...

Embodiment 2

[0024] In the vanadium-containing sodium molybdate solution, Mo=6.8g / L, V=0.1g / L, pH control is 8.0, add new Fe 3 O 4 The powder obtained by drying the sol has a mass ratio of Fe and vanadium in the solution of 95. The adsorption reaction was carried out under the conditions of a temperature of 10°C and a stirring time of 30 minutes. After the reaction, the solid-liquid was completely separated under the action of an external magnetic field for 15 seconds, and the magnetic field intensity was 0.6T. The solution contains Mo=6.4 g / L, V=0.008 g / L; load adsorbent with 1mol / L NH 4 OH solution desorbs, the desorption rate of molybdenum is 96.3%, the desorption rate of vanadium is 99.5%, the adsorbent after desorption can be used continuously.

Embodiment 3

[0026] In the vanadium-containing sodium molybdate solution, Mo=198g / L, V=1 g / L, pH control is 10.5, and newly prepared γ-Fe is added 2 O 3 The mass ratio of Fe in the sol to vanadium in the solution is 62. The adsorption reaction was carried out under the conditions of a temperature of 35°C and a stirring time of 2 hours. After the reaction, the solid-liquid was completely separated under the action of an external magnetic field for 10 seconds, and the magnetic field intensity was 0.5T. The solution contains Mo=190.3 g / L, V=0.019 g / L; the loaded adsorbent is desorbed with 1.5mol / L NaOH solution, the desorption rate of molybdenum is 93.7%, the desorption rate of vanadium is 97.2%, the adsorbent after desorption Can continue to be used.

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Abstract

The invention relates to an inorganic substance purifying technology in chemical and metallurgical fields, in particular to a method for the deep separation of vanadium from molybdate by utilizing magnetic iron oxide as an adsorbent. First, magnetic iron oxide fine particles are prepared. Then, the magnetic iron oxide fine particles are added into a molybdate solution containing vanadium and are mixed through stirring. The magnetic iron oxide particles can selectively adsorb vanadium from the solution. After reaction is finished, the loaded adsorbent is separated from the solution under the action of an external magnetic field, so that a pure molybdate solution is obtained. Due to the adoption of the technical scheme, the method has a good molybdenum and vanadium separating effect, the removing rate of the vanadium can reach more than 95%, and the coadsorption loss of the molybdenum is lower than 5%; the magnetic property of the adsorbent is good, and solid-liquid separation can be finished in 10 seconds; and the method is short in process, simple in equipment, low in cost and suitable for large-range popularization.

Description

Technical field [0001] The invention relates to an inorganic substance purification technology in the chemical and metallurgical fields, in particular to a method for deep separation of vanadium in molybdate by using magnetic iron oxide as an adsorbent for the preparation of pure molybdate products. Background technique [0002] At present, the rare metal molybdenum, with its excellent physical and chemical properties, plays an important role that cannot be replaced in many fields such as the national economy, national defense and military industry, and is regarded as a strategic metal related to national security. With the continuous growth of demand for molybdenum and the consumption of traditional molybdenum resources, non-traditional raw materials such as nickel-molybdenum ore and waste aluminum-based molybdenum catalysts in secondary resources have also become raw materials for molybdenum production. These raw materials all contain trace amounts of vanadium, and the properti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/24C22B3/22C22B34/34C22B34/22
CPCC22B3/22C22B3/24C22B34/22C22B34/34Y02P10/20
Inventor 张家靓胡军涛
Owner UNIV OF SCI & TECH BEIJING
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