Stepped sulfuric acid treatment and roasting process for decomposing Baotou RE ore concentrate

A technology of rare earth sulfate and rare earth in Baotou, which is applied in the field of non-ferrous metallurgy technology, can solve problems such as low labor intensity, and achieve the effects of solving pollution problems, reducing treatment difficulty and improving resource utilization rate.

Inactive Publication Date: 2006-10-18
CHINA NORTHERN RARE EARTH (GROUP) HIGH TECH CO LTD
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Problems solved by technology

[0007] The technical problem solved by the present invention is: the process advantages of low-temperature roasting and high-temperature roasting are selected, and the sulfuric acid roasting process of Baotou rare earth concentrate is divided into two steps, which not only reduces the generation of radioactive waste residue and tail gas waste water, but also recycles the process. The excess sulfuric acid in the medium, and the process continuity is strong, the labor intensity is low, and it is suitable for industrial production

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  • Stepped sulfuric acid treatment and roasting process for decomposing Baotou RE ore concentrate

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Embodiment

[0027] Add 1.1-1.4 tons of 92% or more concentrated sulfuric acid to 1 ton of 50% rare earth concentrate, fully mix in the mixer, enter the low-temperature kiln, and undergo static batch roasting at 180-300°C for 1.5-3 hours to decompose the concentrate The fluorine-containing mineral part in the waste gas, and the mixed minerals are quickly pelletized, and the first step is roasted. At this time, the main component of the exhaust gas is SiF 4 and HF, using a three-stage falling film absorption tower to spray water to cool and eliminate fluorine in the tail gas; transfer the spheroidized concentrate after the first step of roasting to a high-temperature roasting kiln, and perform dynamic roasting at 700-780°C for 1-3 hours , to complete the decomposition process of all concentrates, and the waste gas produced at this time is SO after decomposition of sulfuric acid 3 , choose 80% ~ 92% concentrated sulfuric acid to recover SO in the secondary packed tower 3 , Sulfuric acid is ...

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Abstract

The present invention belongs to the field of non-ferrous metallurgy technology, and is stepped roasting process for decomposing Baotou RE ore concentrate. The technological process includes the following steps: 1. mixing Baotou RE ore concentrate with concentrated sulfuric acid; 2. roasting at 100-320 deg.c for 1-7 hr and spraying water to cool produced gas; and 3. roasting at 600-850 deg.c for 1-4hr, absorbing partial harmful gas with 80-92% concentration sulfuric acid, returning the absorbed concentrated sulfuric acid, cooling gas with water from the second step, and transferring the roasted material to the next step. The present invention combines the low temperature roasting and the high temperature roasting, and has less water consumption, raised resource utilization rate and other advantages.

Description

1. Technical field: [0001] The invention belongs to nonferrous metallurgical technology, and relates to a method for decomposing Baotou rare earth concentrate by roasting and decomposing rare earth concentrate with sulfuric acid. 2. Background technology: [0002] The existing techniques for decomposing rare earth concentrates include "high-temperature intensive roasting of concentrated sulfuric acid to decompose Baotou rare earth concentrates" and "low temperature roasting and decomposition of Baotou rare earth concentrates". [0003] The high-temperature method uses concentrated sulfuric acid to be added to the concentrate, and after mixing, it is roasted at high temperature to complete the decomposition of Baotou rare earth concentrate. The main process of high-temperature roasting currently used is as follows: [0004] Add 1.3-1.4 tons of 92% or more concentrated sulfuric acid to 1 ton of 50% rare earth concentrate, mix well, and dynamically roast at 720-780 for 1.5-3 ho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/06C22B59/00
Inventor 赵治华王志强柳勇王静李冬
Owner CHINA NORTHERN RARE EARTH (GROUP) HIGH TECH CO LTD
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