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Method for comprehensively recovering lignite rich in rare elements

A technology for rare elements and rare earth elements, applied in the field of comprehensive recovery of lignite rich in rare elements, can solve the problems of low lignite ash volatilization rate, difficult to guarantee atmosphere, long volatilization time, etc. short effect

Active Publication Date: 2022-06-03
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the wet extraction process uses a large amount of acid and the cost is high. In the fire extraction process, the volatilization rate of lignite ash is low, and the volatilization time is long, and the atmosphere is difficult to ensure.
The research on the extraction of rare earth elements from lignite is still in its infancy, and the existing technologies generally have the problems of high production cost and low extraction rate

Method used

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  • Method for comprehensively recovering lignite rich in rare elements
  • Method for comprehensively recovering lignite rich in rare elements
  • Method for comprehensively recovering lignite rich in rare elements

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] For a lignite containing germanium 106ppm and rare earth 58ppm in Inner Mongolia (the moisture content is about 20%), the raw coal is first broken into small particles below 80 mesh, and then the coal sample is subjected to low temperature plasma treatment, and the lignite raw material is put into the low temperature plasma In the processing device, pass O 2 , the control discharge power is 200W, the thickness of lignite is 3mm, the speed of the container in the cabin is 20rpm, and it is treated at 100 ℃ for 2h. After the treatment, the treated coal sample is obtained; The activator mixed at 100:1 was slowly added dropwise to the treated coal sample, the solid-liquid ratio was 1:3, the solution temperature was controlled at 25 °C, and the solution was stirred for 10 hours. It is used to continue extracting rare metals; after washing the solid after solid-liquid separation, add 5% sodium hydroxide solution (10% of which is sodium tripolyphosphate), the solid-liquid ratio...

Embodiment 2

[0050] Other conditions are the same as those in Example 1, the difference is: during low-temperature plasma treatment, N 2 , the reaction atmosphere is nitrogen atmosphere; finally, the total dissolution rate of germanium is 93.83%, the total dissolution rate of rare earth is 83.05%, and the yield of organic matter is 41.29%. Through the comparison between Comparative Example 3 and Example 1, it is found that in the low temperature plasma treatment, the effect of using oxygen is better than that of using nitrogen.

Embodiment 3

[0054] The other conditions are the same as those in Example 1, except that the low-temperature plasma treatment time is 6h;

[0055] Finally, the total dissolution rate of germanium was 94.23%, the total dissolution rate of rare earth was 82.94%, and the yield of organic matter was 40.02%. Through Comparative Example 3 and Example 1, it is found that long-term low-temperature plasma treatment will lead to a significant decrease in the yield of organic matter, and the dissolution rate of rare earth has begun to decline.

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Abstract

The invention discloses a method for comprehensively recovering lignite rich in rare elements. The method mainly comprises the following steps: (1) crushing and finely grinding raw coal; (2) performing low-temperature plasma treatment, (3) performing wet activation treatment, and releasing rare elements such as germanium, gallium, lithium, vanadium, rare earth and the like from the lignite by adding an activating agent; (4) heating alkali treatment, (5) controlled potential acid treatment, (6) wastewater treatment and circulation, and neutralization and circulation of residual acid liquor after rare metal extraction and residual alkali liquor in the alkali treatment process in the treatment process; on the premise of considering the production cost, while rare elements in the lignite are extracted, productization of residual organic matters in the lignite is realized, the quantity of residual solids is small, building materials are easy to realize, most of residual acid and alkali solutions in the treatment process can be treated and recycled in the process, and the method has the advantages of high efficiency and energy conservation.

Description

technical field [0001] The invention discloses a method for comprehensive recovery of lignite rich in rare elements, and relates to the technical field of comprehensive recovery and treatment of solid materials. Background technique [0002] Lignite is the coal with the lowest degree of metamorphism, and is the initial product of peat dehydration and compaction into organic biorock. my country is rich in lignite resources, with reserves of about 211.8 billion tons, accounting for about 13% of the country's coal reserves. Lignite has the advantages of high moisture content, low density and low calorific value. It has the advantages of cleanliness, low volatility and low sulfur. However, because it is rich in volatile matter, it will emit a lot of smoke when it is burned, which limits the application of lignite to a certain extent and makes lignite. Lignite is often regarded as an inferior fuel. Therefore, it is very necessary to research and develop the non-fuel utilization ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/00C22B41/00C22B59/00C22B3/04C22B3/12C08H7/00
CPCC22B1/00C22B41/00C22B59/00C22B3/04C22B3/12C08H6/00Y02P10/20
Inventor 唐鸿鹄刘丙建张臻悦李梦闪王翠孙伟王丽韩海生
Owner CENT SOUTH UNIV
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