Method for producing mischmetal using Mianning rare earth ore as raw material

A technology of mixed rare earth and rare earth ore, which is applied in the direction of improving process efficiency to achieve the effect of simplifying the production process

Inactive Publication Date: 2007-02-07
MIANNING FEITIAN IND
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of this invention is to provide a kind of all with Sichuan Mianning rare earth ore as raw material, namely with cerium dioxide (CeO 2 ) process method for producing mixed rare earth metals by mixing rare earth chlorides produced by rare earth mines with less than 48% by weight, so as to overcome the deficiency that the existing technology cannot produce mixed rare earth metals by using mixed rare earth chlorides produced by Sichuan Mianning Rare Earth Mine , to further develop the value of Mianning Rare Earth Mine

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  • Method for producing mischmetal using Mianning rare earth ore as raw material
  • Method for producing mischmetal using Mianning rare earth ore as raw material
  • Method for producing mischmetal using Mianning rare earth ore as raw material

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Embodiment 1

[0030] Its process flow is attached figure 1 shown. The process for preparing mixed rare earth chlorides from Sichuan Mianning rare earth mines is carried out in the following steps.

[0031] 1. Sichuan Mianning rare earth concentrate after physical beneficiation treatment is oxidized and roasted at about 550°C for about 4 hours, so that the fluorocarbonate in the rare earth ore is converted into oxide and oxyfluoride, and the non-quaternary cerium is converted into Cerium in the 4-valent state is beneficial to the separation of cerium and other rare earth components in the subsequent process.

[0032] 2. Add hydrochloric acid with a weight concentration of about 30% into the oxidized and roasted rare earth slurry to dissolve the rare earth ore so that the non-CeO in the rare earth ore 2 The rare earth components are preferentially eluted, the amount of acid used is about 0.6 times the weight of the rare earth oxide contained in the rare earth ore, the dissolution temperatur...

Embodiment 2

[0038] Its process flow is attached figure 2 shown. The cerium-poor mixed rare earth chloride liquid separated in the excellent melting process is heated, evaporated and concentrated, and then cooled to crystallize the rare earth in the liquid, so as to obtain a cerium-poor and lanthanum-rich mixed rare earth chloride by-product. Other parts of the process in this embodiment are the same as in Embodiment 1.

Embodiment 3

[0040] Its process is as image 3 shown. The solid-phase slag separated from the complete melting process is further processed to recover the effective rare earth components contained in it. The specific process steps are as follows:

[0041] 1. Using a sodium hydroxide solution with a weight concentration of about 35% to carry out a conversion reaction on the solid-phase slag, so that the rare earth compounds in the rare earth slag that are insoluble in acid are converted into rare earth hydroxides that are easily soluble in acid. The amount of sodium hydroxide is about 0.8 times the weight of the rare earth oxide contained in the ore, the conversion temperature is about 97 ° C, the conversion reaction time is about 3 hours, and then the solid-liquid separation is carried out by filtration, and the obtained solid phase is washed with water. , sent to the next process, and the liquid phase is discharged as waste water.

[0042] 2. Dissolving the rare earth hydroxide with hyd...

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Abstract

This invention provides a mischmetal production method produced by mixed chloridized rare-earth, which is produced from rare-earth ore, characterized as: adding a process for preferentially dissolving non-cerium (CeO # - [2]) the rare earth component using the hydrochloric acid as solvents before completely dissolving, promoting cerium content of mixed chloridized rare-earth through promoting cerium of material ore,further promoting Cerium of mischmetal. The inventive method can accomplish the production of mischmetal according to the cerium content design and satisfy the needs of different cerium content in industry.

Description

1. Technical field [0001] The present invention relates to the technical field of rare earth production, more specifically, it involves using Sichuan Mianning rare earth ore as raw material, first preparing mixed rare earth chloride through oxidation roasting and hydrochloric acid dissolution, and then using potassium chloride as electrolyte to prepare mixed rare earth chloride A process for producing mixed rare earth metals by electrolysis of rare earths. 2. Background technology [0002] China is a major producer of rare earths. The enterprises in China that produce misch metals by chloride molten salt electrolysis are mainly concentrated in the Baotou area of ​​Inner Mongolia, and misch chlorides that produce misch metals are mainly produced from Inner Mongolia rare earth mines. The main component weight percentage of Inner Mongolia rare earth ore is as follows: La 2 o 3 : 24.93, CeO 2 : 51.45, Pr 6 o 11 : 5.41, Nd 2 o 3 : 17.41, Sm 2 o 3 : 1.09, Eu 2 o 3 : 0.3...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/10C22B1/02C22B59/00
CPCY02P10/20
Inventor 卢万新邓勇郝喜宝蔡蔚佘国康
Owner MIANNING FEITIAN IND
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