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Microwave-assisted low-temperature acid pickling method of rare-earth ore concentrate

A rare earth concentrate, microwave-assisted technology, applied in the direction of process efficiency improvement, etc., can solve the problems of rare earth concentrate acid leaching decomposition rate reduction, rare earth leaching time extension, leaching rate reduction, etc., to improve the liquid-solid mass transfer rate , Shorten the production cycle and simplify the operation

Inactive Publication Date: 2013-03-20
INNER MONGOLIA UNIV OF SCI & TECH
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  • Application Information

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Problems solved by technology

[0005] Experiments show that: above 200°C, thorium phosphate begins to generate water-insoluble pyrophosphate, so the lower the temperature, the less likely thorium will enter the solid slag, but the lower the temperature, the lower the decomposition rate of rare earth concentrate acid leaching, resulting in Rare earth leaching time prolongs and leaching rate decreases

Method used

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  • Microwave-assisted low-temperature acid pickling method of rare-earth ore concentrate
  • Microwave-assisted low-temperature acid pickling method of rare-earth ore concentrate

Examples

Experimental program
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Effect test

Embodiment 1

[0018] Example 1: The rare earth concentrate in this example comes from Baotou Rare Earth Hi-Tech, and its composition is shown in Table 1.

[0019] Table 1 Chemical composition of Baotou rare earth concentrate / (%, mass fraction)

[0020]

[0021] The present invention adopts the method of low-temperature acid leaching of rare earth concentrates assisted by microwaves to process rare earth concentrates. According to the mass ratio of REO content of 45.77% rare earth concentrates and sulfuric acid with a mass percentage concentration of 98%, the mass ratio is 1:1.5, and the two are mixed evenly. , heated in a chemical microwave roaster for 10 minutes at a roasting temperature of 200°C; then add deionized water to the roasted product to dilute, stir, and separate the solid and liquid in a centrifuge, so that the acid leached ore is washed three times to separate the slag from the liquid , to complete the leaching of rare earths. The final rare earth leaching rate was 96.21...

Embodiment 2

[0023] The rare earth concentrate in Example 1 is processed by microwave-assisted low-temperature acid leaching of rare earth concentrate. According to the ratio of REO content of 45.77% rare earth concentrate to sulfuric acid with a mass percentage concentration of 98%, the mass ratio is 1:2, and the two Mix well, roast in chemical microwave roasting furnace for 5 minutes, roasting temperature is 200 ℃; then roast in muffle furnace for 10 minutes, add deionized water to the roasted product and stir for 30 minutes, and carry out solid-liquid separation in centrifuge, so Wash the acid leaching ore three times, separate the slag liquid, and complete the leaching of rare earth. The final rare earth leaching rate was 99.08%, and the content of thorium in the slag was 0.034%.

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Abstract

The invention relates to a microwave-assisted low-temperature acid pickling method of rare-earth ore concentrate, and belongs to the technical field of mineral extraction and metallurgy. The microwave-assisted low-temperature acid pickling method comprises the following steps: (1) uniformly mixing the rare-earth ore concentrate with concentrated sulfuric acid based on a certain ratio; (2) heating for 3 to 15 minutes through a microwave chemical reacting furnace at 90 to 200 DEG C, and fully dissolving the rare-earth ore concentrate; and (3) separating rare-earth leaching liquid from leaching residue in a centrifugal water washing way, so as to complete the leaching of the rare earth. According to the microwave-assisted low-temperature acid pickling method of rare-earth ore concentrate, the microwave-assisted and low-temperature acid pickling way is carried out on the rare earth, so that the leaching time is short, the rare-earth leaching rate is high, little consumption is brought to acid agent, the energy consumption is low, the emission of thorium and harmful gas is reduced, the recycle of the thorium is realized, the production efficiency is improved, and the pollution to environment is reduced as well; and the microwave-assisted low-temperature acid pickling method of rare-earth ore concentrate is an economic and environment-friendly method, and brings actual guiding significance to the rare-earth smelting process.

Description

technical field [0001] The invention relates to a microwave-assisted low-temperature acid leaching method for rare earth concentrates, belonging to the technical field of mineral extraction and metallurgy. Background technique [0002] Rare earth is known as the treasure house of high-tech and functional materials in the new century. It is a strategic element for the development of high-tech. It is not only widely used in traditional industries such as metallurgy, building materials, chemicals, agriculture and medicine, but also in machinery, petrochemical, In light spinning. As a functional material, rare earth has become an important basic material in high-tech fields such as information technology, biotechnology, and energy technology. Its special properties relate to almost all functional materials. Rare earth functional materials are the core foundation of the new material field. Functional materials account for more than 80% in the field of new material research. The...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/08C22B59/00
CPCY02P10/20
Inventor 李解李保卫韩继铖
Owner INNER MONGOLIA UNIV OF SCI & TECH
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