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Mixed rare earth concentrate decomposition method

A mixed rare earth and concentrate technology, applied in separation methods, chemical instruments and methods, dispersed particle separation, etc., can solve the problems of waste gas and waste residue polluting the environment, reduce lime consumption, reduce storage costs, and achieve high decomposition rates. Effect

Active Publication Date: 2006-11-29
中国有色工程设计研究总院 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to solve the problem of serious environmental pollution caused by waste gas and waste slag existing in the roasting and decomposition process of concentrated sulfuric acid of rare earth concentrate, and to realize the effective recovery of valuable thorium elements in the concentrate

Method used

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  • Mixed rare earth concentrate decomposition method

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Get 100g mixed type rare earth concentrate, the main components of the concentrate are as follows (percentage by weight):

[0031] REO ThO 2 F P 2 o 5

[0032] 55% 0.20% 7.5% 6.5%

[0033] Get 165g concentration and be that the concentrated sulfuric acid of 98% is mixed with above-mentioned concentrate, and mixture is placed in the incubator immediately, and the temperature of measured concentrate is 70 ℃. After aging for 8 hours, take it out and put it into a muffle furnace, and bake it at 250° C. for 2 hours. Then take it out, add 800ml of water, and leaching for 1 hour at 30°C. Analysis of RE on leach residue 2 o 3 (Determined by the content of Ce in the slag) and the content of thorium, and detect the radioactivity of the slag. The leaching rate of RE is greater than 95%, the leaching rate of thorium is 96%, the thorium content in the leaching residue is less than 0.05%, and the total specific activity of radioactivity is less than 1×10 4 Bq...

Embodiment 2～10

[0039] Examples 2-10 all take 100g of the mixed rare earth concentrate described in Example 1, and then mix each with 165g of concentrated sulfuric acid, and after aging for a period of time, put them into a muffle furnace for roasting. The produced calcine was leached with 800ml of water, and the leaching solution and slag were analyzed for REO, ThO content, and slag specific activity of radioactivity. The aging temperature, roasting temperature and time and calcine leaching results are shown in Table 1.

[0040] Numbering

Embodiment 11

[0042] Take 5 kg of the rare earth concentrate described in Example 1, add concentrated sulfuric acid according to the mass ratio of the concentrate to concentrated sulfuric acid 1:1.5, stir and mix and then mature, the curing temperature is 60°C. Then take it out and add it to the rotary kiln for roasting. The concentrate goes in and out of the rotary kiln continuously, and the residence time in the kiln is 1.5 hours. The inlet temperature of the rotary kiln is 200°C, the outlet temperature is 210°C, and the maximum temperature in the kiln is 250°C. The calcined sand produced by roasting automatically enters the collecting hopper at the outlet of the rotary kiln, and then soaked in water to analyze the rare earth and thorium content in the slag and liquid. The rare earth leaching rate is greater than 95%, the thorium leaching rate is greater than 95%. 4 Bq / Kg; the flue gas enters the vertical flue, and liquid ammonia is sprayed into the flue, and the fluorine content of the g...

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Abstract

This invention provides a rare earths finished ore decomposition method. It includes following procedures (1) rare earths finished ore and concentrated oil of vitriol are blending as weight rate 1:1.1~1.7. (2) The rare earths finished ore after blending is slaked at 40~1800C. (3) The terrae rare finished ore after slaking is baked 1~8 hours at 150~3300C. (4) Baking ore is dunked by water to make 95% of rare earths and thorium entering solution, then they are separated by extraction, thorium nitrate product is got after scrubbing and reverse extraction, rare earths product not contain thorium is got after the solution extracted precipitating. (5) Fume generated by baking is discharged after defluorinated by ammonia or water scrubbing. (6) The residue from dunking is discharged after water scrubbing. Radioactive waste residue, waste water and waste gas contain fluorin and other problem brought by rare earths extraction can be solved by taking this invention to propose rare earths finished ore. It reaches country discharge standard and can realize cleaning production.

Description

technical field [0001] The invention relates to a method for decomposing mixed rare earth concentrate, which belongs to the field of rare earth metallurgy. Background technique [0002] my country's Baotou rare earth ore accounts for about 80% of the total domestic reserves, and belongs to the mixed rare earth ore composed of bastnaesite and monazite. At present, the high-temperature concentrated sulfuric acid process is mainly used in China to process Baotou mixed rare earth concentrates, that is, the rare earth concentrates are first decomposed with concentrated sulfuric acid at high temperature, and then various rare earth products are produced through leaching, purification and impurity removal processes. [0003] The above-mentioned rare earth concentrate concentrated sulfuric acid decomposition process is also called the three-generation acid method and the high-temperature sulfuric acid roasting method. In this method, concentrated sulfuric acid and rare earth concen...

Claims

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Application Information

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IPC IPC(8): C22B3/08B01D53/68C22B59/00
CPCY02P10/20
Inventor 李国民胡克强刘金山王国珍徐庆新王文惠郭玲弟于俊霞胡天润陈鹏曾天元肖荣辉
Owner 中国有色工程设计研究总院
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