Method for preparing ferrous oxalate by using vanadium slag

A technology of ferrous oxalate and vanadium slag, which is applied in the direction of carboxylate preparation, carboxylate preparation, chemical instruments and methods, etc., to achieve the effect of simple synthesis, low equipment requirements, and comprehensive utilization

Active Publication Date: 2019-09-20
PANZHIHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the defects of existing methods for preparing ferrous oxalate, the technical problem s...

Method used

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  • Method for preparing ferrous oxalate by using vanadium slag
  • Method for preparing ferrous oxalate by using vanadium slag
  • Method for preparing ferrous oxalate by using vanadium slag

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Embodiment 1

[0050] A kind of method utilizing vanadium slag to prepare ferrous oxalate, its concrete steps are as follows:

[0051] (1) First, the quaternary ammonium salt and oxalic acid dihydrate are placed in a beaker to mix uniformly according to a molar ratio of 1:1 to form a deep eutectic solvent as a leaching agent, wherein the quaternary ammonium salt is choline chloride;

[0052] (2) Then the vanadium slag is added in the deep eutectic solvent (liquid-solid ratio is 1:15), the stirring speed is 400 rpm, the temperature is 333K, and the leaching time is 8h;

[0053] (3) Separating the leached pulp from solid to liquid, adding 4 times the volume of deionized water to the leachate obtained by filtration, and standing for precipitation for 3 hours;

[0054] (4) Finally, the leaching solution after standing and precipitating is filtered, and the generated powder is ultrasonically washed with deionized water, washed with alcohol, and vacuum-dried to obtain the higher-purity ferrous oxa...

Embodiment 2

[0057] A kind of method utilizing vanadium slag to prepare ferrous oxalate, its concrete steps are as follows:

[0058] (1) First, quaternary ammonium salt and dihydrate oxalic acid are placed in a beaker and mixed uniformly according to a molar ratio of 1:2 to form a deep eutectic solvent as a leaching agent, wherein the quaternary ammonium salt is choline chloride;

[0059] (2) Then the vanadium slag is added in the deep eutectic solvent (liquid-solid ratio is 1:10), the stirring speed is 500 rpm, the temperature is 323K, and the leaching time is 10h;

[0060] (3) Separating the leached pulp from solid to liquid, adding 4 times the volume of deionized water to the leachate obtained by filtration, and standing for precipitation for 5 hours;

[0061] (4) Finally, the leaching solution after static precipitation is filtered, and the generated powder is ultrasonically washed with deionized water, washed with alcohol, and vacuum-dried to obtain the higher-purity ferrous oxalate c...

Embodiment 3

[0064] A kind of method utilizing vanadium slag to prepare ferrous oxalate, its concrete steps are as follows:

[0065] (1) First, the quaternary ammonium salt and oxalic acid dihydrate are placed in a beaker to mix uniformly according to a molar ratio of 1:1 to form a deep eutectic solvent as a leaching agent, wherein the quaternary ammonium salt is choline chloride;

[0066] (2) Then vanadium slag is added in the deep eutectic solvent (liquid-solid ratio is 1:10), stirring speed is 500 rpm, temperature is 353K, and leaching time is 4h;

[0067] (3) Separating the leached pulp from solid to liquid, adding 4 times the volume of deionized water to the leachate obtained by filtration, and standing for precipitation for 2 hours;

[0068] (4) Finally, the leaching solution after static precipitation is filtered, and the generated powder is ultrasonically washed with deionized water, washed with alcohol, and vacuum-dried to obtain the higher-purity ferrous oxalate crystal, which ha...

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Abstract

The invention relates to a method for preparing ferrous oxalate by using vanadium slag, and belongs to the technical field of preparation of ferrous oxalate for batteries. The technical problem solved by the invention is to provide the method for preparing the ferrous oxalate by using the vanadium slag. The method includes the following steps: mixing quaternary ammonium salt with oxalic acid to form an eutectic solvent; and adding the vanadium slag into the eutectic solvent for leaching, carrying out solid-liquid separation to obtain a leachate, adding deionized water into the leachate, standing and filtering the mixture, and washing and drying obtained solid to obtain a ferrous oxalate crystal. The method of the invention uses the vanadium slag as a raw material to prepare the ferrous oxalate crystal with high purity and particle size of 0.5-2 [mu]m, which has the advantages of small particle size, uniform size and high purity and can be used as a raw material for synthesizing a lithium ion battery positive electrode material lithium iron phosphate, is low in equipment requirements, short in process flow and environmentally friendly, and can comprehensively utilize valuable metal resources of the vanadium slag. Moreover, the used eutectic solvent has the advantages of environmental protection, simple synthesis and low price.

Description

technical field [0001] The invention relates to a method for preparing ferrous oxalate by utilizing vanadium slag, and belongs to the technical field of preparing ferrous oxalate for batteries. Background technique [0002] With the widespread application of lithium-ion batteries in various aspects of the national economy such as electric vehicles and electronic products, the demand for advanced battery materials, especially cathode materials, is also increasing day by day. Lithium iron phosphate has attracted extensive attention and recognition of researchers due to its good safety performance and high rate charge and discharge performance. As a chemical raw material, ferrous oxalate is often widely used in the production of colorants and photosensitive materials for paints, dyes, ceramics, glassware and other materials, and is also a high-quality raw material for the synthesis of lithium iron phosphate. The quality of ferrous oxalate plays a decisive role in the performan...

Claims

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Application Information

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IPC IPC(8): C07C51/41C07C55/07C01B25/45
CPCC01B25/45C07C51/412C07C55/07
Inventor 张远施明川黄平卢进刘甜甜
Owner PANZHIHUA UNIV
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