Method for extracting iron and cobalt from iron tailings of neodymium iron boron waste hydrochloric acid optimal solution method

An iron tailings, NdFeB technology, applied in the direction of improving process efficiency, can solve the problems of high price of organic additives, low leaching rate, high energy consumption, achieve significant economic and environmental benefits, reduce impurities separation operations, The effect of easy industrial production

Pending Publication Date: 2021-08-24
JIANGXI INST OF RARE EARTHS CHINESE ACAD OF SCI +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the organic additives used in this method are expensive, and the organic medium is difficult to recycle. In addition, iron cannot be leached deeply, and the leaching rate is up to 97%.
[0006] To sum up, there are many problems such as high energy consumption, low leaching rate and poor economy in the method of improving iron leaching rate in iron oxide waste residue by reduction acid leaching. Simultaneous deep extraction of iron and cobalt from iron tailings

Method used

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  • Method for extracting iron and cobalt from iron tailings of neodymium iron boron waste hydrochloric acid optimal solution method
  • Method for extracting iron and cobalt from iron tailings of neodymium iron boron waste hydrochloric acid optimal solution method
  • Method for extracting iron and cobalt from iron tailings of neodymium iron boron waste hydrochloric acid optimal solution method

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Effect test

Embodiment 1

[0057] This embodiment provides a method for extracting iron and cobalt from NdFeB waste hydrochloric acid excellent solution iron tailings, and the process flow chart of the method is as follows figure 1 shown.

[0058] The composition of the iron tailings that the present embodiment adopts is as shown in table 1, and its XRD figure is as follows figure 2 shown.

[0059] Table 1

[0060] Element Fe 2 o 3

CoO SiO 2

CaO ZnO Al 2 o 3

content 72.06 0.51 15.30 0.31 0.17 5.42

[0061] The composition of the reductant-pyrite that the present embodiment adopts is as shown in table 2, and its XRD figure is as follows image 3 shown.

[0062] Table 2

[0063] Element Fe S SiO 2

Al 2 o 3

content 42.34 44.27 3.37 0.74

[0064] The method comprises the steps of:

[0065] (1) Tailings pulping: Sieve the iron tailings to obtain particles with a particle size not greater than 4mm for use; mix...

Embodiment 2

[0069] This embodiment provides a method for extracting iron and cobalt from the iron tailings of the NdFeB waste hydrochloric acid excellent solution method, and the iron tailings used in it have the same composition as that in Example 1.

[0070] The method comprises the steps of:

[0071] (1) Tailings pulping: Sieve the iron tailings to obtain particles with a particle size not greater than 4mm for use; mix 10kg of iron tailings particles with 15kg of water, stir thoroughly for 60 minutes and pass through a 5-mesh screen to obtain dispersion Ore slurry; after drying the residue on the mesh screen, the measured quality is 0.17kg, and 0.17kg of iron tailing particles to be used is added to the dispersed ore slurry;

[0072] (2) Ore pulp acid adjustment: add 19kg, the concentrated sulfuric acid that massfraction is 98wt% in the dispersed ore pulp that step (1) obtains under stirring state, make the concentrated sulfuric acid concentration in the dispersed ore slurry liquid pha...

Embodiment 3

[0075] This embodiment provides a method for extracting iron and cobalt from the iron tailings of the NdFeB waste hydrochloric acid excellent solution method, and the iron tailings used in it have the same composition as that in Example 1.

[0076] The method comprises the steps of:

[0077] (1) Tailings pulping: Sieve the iron tailings to obtain particles with a particle size not greater than 4mm for use; mix 10kg of iron tailings particles with 10kg of water, stir thoroughly for 60 minutes and pass through a 5-mesh screen to obtain dispersion Ore slurry; after drying the residue on the mesh screen, the measured quality is 0.52kg, and 0.52kg of iron tailing particles to be used is added to the dispersed ore slurry;

[0078] (2) acid adjustment of ore pulp: add 16.2kg, massfraction is the vitriol oil of 98wt% in the dispersed ore pulp that step (1) obtains under stirring state, the concentrated sulfuric acid concentration in the dispersed ore slurry liquid phase is adjusted to...

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Abstract

The invention provides a method for extracting iron and cobalt from iron tailings of a neodymium iron boron waste hydrochloric acid optimal solution method. The method comprises the following steps that the iron tailings are mixed with water to obtain dispersed ore pulp; a concentrated acid solution is added into the obtained dispersed ore pulp for a reaction, and reaction slurry is obtained; and a reducing agent is added into the obtained reaction slurry at least twice for a reduction reaction, and leaching residues and leaching liquid containing iron and cobalt are obtained. According to the method for extracting iron and cobalt from the iron tailings of the neodymium iron boron waste hydrochloric acid optimal solution method, the iron and the cobalt in the iron tailings of the neodymium iron boron waste hydrochloric acid optimal solution method can be effectively recycled, deep extraction of the iron and the cobalt in the iron tailings is achieved, the leaching rate of the iron reaches 98.1% or above, and the leaching rate of the cobalt reaches 97.2% or above; and the method is simple in process, high in continuous degree and easy for industrial production, and has remarkable economic and environmental benefits. Good industrial application prospects are realized.

Description

technical field [0001] The invention belongs to the technical field of metal resource recovery and utilization, and in particular relates to a method for extracting iron and cobalt from iron tailings of NdFeB waste hydrochloric acid excellent solution method. Background technique [0002] NdFeB magnets are important rare earth functional materials. With the rapid development of new energy vehicles, wind power generation, electronic information and other industries, the demand for NdFeB magnetic materials is increasing year by year. In the production process of NdFeB, about 30% of waste materials will be produced. These waste materials contain 20%-30% of rare earth elements, which are valuable secondary resources. Recycling them is not only beneficial to environmental protection, but also has Contribute to the sustainable development of the rare earth industry. [0003] At present, the hydrochloric acid excellent solution method is used in China to recover rare earths from ...

Claims

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Application Information

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IPC IPC(8): C22B7/04C22B23/00
CPCC22B7/04C22B7/007C22B23/0423C22B23/043Y02P10/20
Inventor 王东王志杜浩杰郭建伟李世健孟龙
Owner JIANGXI INST OF RARE EARTHS CHINESE ACAD OF SCI
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