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Method for processing rare earth ore concentrate

A rare earth concentrate and mixed treatment technology, which is applied in the direction of improving process efficiency, can solve problems such as difficult continuous dynamic production, and achieve the effects of avoiding radioactive hazards, avoiding decomposition, and shortening time

Active Publication Date: 2017-12-15
CHINA ENFI ENGINEERING CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the process technology is not yet mature, and it is difficult to carry out continuous dynamic production

Method used

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  • Method for processing rare earth ore concentrate
  • Method for processing rare earth ore concentrate
  • Method for processing rare earth ore concentrate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0109] The bastnaesite rare earth ore is ball milled by a ball mill and sieved by a screening device to obtain bastnaesite rare earth concentrate particles with a particle size of 80-320 mesh; the bastnaesite rare earth concentrate is measured and put into the pre-measured In the mixing device containing 98wt% concentrated sulfuric acid, the mass ratio of concentrated sulfuric acid to bastnaesium rare earth concentrate particles is 1.4:1, the circulating cooling water of the mixing device is turned on, and the temperature in the mixing device is controlled to be less than 30 degrees Celsius, Stir fully for 10 minutes to form a uniform mixed slurry mixed with acid, and at the same time generate the first fluorine-containing gas; then discharge the mixed slurry through the mixed slurry outlet of the mixing device, add it to the acid hydrolysis device, and open the trigger solution (industrial water) to enter the liquid The valve dilutes the concentrated sulfuric acid in the mixed...

Embodiment 2

[0112] The bastnaesite rare earth ore is ball milled by a ball mill and screened by a screening device to obtain bastnaesite rare earth concentrate particles with a particle size of 80-320 mesh; the bastnaesite rare earth concentrate particles are measured and placed in a pre-measured container In the mixing device with 98wt% concentrated sulfuric acid, the mass ratio of concentrated sulfuric acid to bastnaesin rare earth concentrate particles is 1.5:1, the circulating cooling water of the mixing device is turned on, and the temperature in the mixing device is controlled to be less than 30 degrees Celsius, fully Stir for 8 minutes to form a uniform mixed slurry mixed with acid, and generate the first fluorine-containing gas at the same time; then discharge the mixed slurry through the mixed slurry outlet of the mixing device, add it to the acid hydrolysis device, and open the trigger liquid (waste acid) inlet valve , dilute the concentrated sulfuric acid in the mixed slurry, re...

Embodiment 3

[0115] Put the mixed ore containing bastnaesite rare earth and monazite with a particle size of 80-320 mesh into the mixing device that has been measured in advance and contains 98wt% concentrated sulfuric acid. The mass ratio of concentrated sulfuric acid to mixed ore is 1.5 : 1. Turn on the circulating cooling water of the mixing device, control the temperature in the mixing device to be less than 30 degrees Celsius, and fully stir for 10 minutes to form a mixed slurry evenly mixed with acid, and generate the first fluorine-containing gas at the same time; then mix the mixed slurry through mixing The mixed slurry outlet of the device is discharged, added to the acidolysis unit, the inlet valve of the trigger solution (mixed solution containing industrial water and waste acid) is opened, the concentrated sulfuric acid in the mixed slurry is diluted, heat is released, and the acidolysis unit is assisted Heating device, adjust the temperature in the acidolysis device, stir at 85...

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Abstract

The invention discloses a method for processing rare earth ore concentrate. The method includes the steps that firstly, the rare earth ore concentrate and concentrated sulfuric acid are mixed so that mixed slurry and first fluorine-containing gas can be obtained; secondly, the mixed slurry and initiating liquid are mixed and subjected to acidolysis processing so that clinker and second fluorine-containing gas can be obtained; thirdly, the clinker and water are mixed and then subjected to leaching processing so that leached slurry can be obtained; and fourthly, the leached slurry is subjected to solid-liquid separation processing so that filtered fluid and leached residues can be obtained, and the leached residues are returned to the second step to be subjected to acidolysis processing. By means of the method, bastnaesite rare earth ore and mixed ore containing fluorine-containing rare earth ore and monazite can be processed, the energy consumption is low, and continuous production can be achieved; and meanwhile, thorium resources can be effectively recycled, the decomposition rate of the rare earth ore concentrate is remarkably increased, and the REO decomposition rate can reach 96%.

Description

technical field [0001] The invention belongs to the field of rare earth production, in particular, the invention relates to a method for processing rare earth concentrates. Background technique [0002] Baotou mixed ore [mixed ore of bastnaesite rare earth and monazite (bastnasite / bastnasite)] and bastnaesite are important components of rare earth mines in my country. According to the characteristics of Baotou mixed ore, the current industrial method to deal with this kind of ore is mainly concentrated sulfuric acid roasting method. The process of this method is continuous and easy to control, and it is easy to produce on a large scale. However, due to the decomposition of the mixed ore at high temperature, the thorium in the ore enters the slag in the form of thorium pyrophosphate, which will cause radioactive pollution and waste thorium resources. And it is difficult to recycle waste gas containing fluorine and sulfur. According to the characteristics of bastnaesite, the...

Claims

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Application Information

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IPC IPC(8): C22B59/00C22B1/06
CPCC22B1/06C22B59/00C22B3/02Y02P10/20C22B3/04C22B3/22C22B3/08C22B60/0291
Inventor 唐建文杜国山羡鹏飞邱爽周文龙覃波
Owner CHINA ENFI ENGINEERING CORPORATION
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