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Method for preparing rare earth by reducing ammonia nitrogen oxygen demand (COD) and adjusting potential of hydrogen (pH) value from rare earth mine leach liquor

A technology for leaching liquid and rare earth ore, which is applied in the field of rare earth production by reducing the ammonia nitrogen oxygen demand (COD) and adjusting the pH value from the leach liquid of rare earth ore. Application and other issues, to achieve the effect of reducing secondary pollution, improving the environment, and subtracting the acid-dissolving process

Inactive Publication Date: 2012-08-22
郑耀秋
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, naphthenic acid has high water solubility and serious loss, and in the process of operation, impurities such as Fe2+, Al3+, and Ca2+ are strictly controlled, and it is easy to emulsify. Hexylphosphonic acid mono(2-ethylhexyl) ester (P507) is used as an extraction agent, which requires a large investment and is completely unsuitable for the small and scattered characteristics of weathering crust leaching (ion adsorption) type rare earth deposits, so it is difficult to apply in mines , and the equivalent concentration of acid reflux is high, and the organic pollution is large

Method used

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  • Method for preparing rare earth by reducing ammonia nitrogen oxygen demand (COD) and adjusting potential of hydrogen (pH) value from rare earth mine leach liquor
  • Method for preparing rare earth by reducing ammonia nitrogen oxygen demand (COD) and adjusting potential of hydrogen (pH) value from rare earth mine leach liquor

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example 1

[0019] Use 2.0% ammonium bisulfate solution as leaching agent 1 to carry out raw ore leaching 2 to rare earth mines, and leaching solution 3 is rare earth mother liquor containing rare earth oxide 3.65g / L, aluminum: 0.75%, lead: 0.02g / L, calcium: 0.25g / L, Copper: 0.015g / L, Ammonia Nitrogen: 325mg / L.pH: 4.8, Chemical Oxygen Demand (COD): 120mg / L, after neutralization and precipitation, coagulation, clarification, removal of ammonia nitrogen, reflux, aeration , blowing off and other processes, discharge supernatant to detect rare earth concentration: 0.001g / L, all heavy metals are trace, pH: 8.5 ammonia nitrogen: 30mg / L, chemical oxygen demand (COD): 25mg / L The recovery rate of rare earth in the whole process More than 96%, the water quality treatment reaches the national second and third level discharge standards. At the same time, using rare earth hydroxides to prepare rare earth chloride feed liquid C RE : 154.54~176.46g / L, specific gravity: 1.28g / mL Al 2 o 3 : 1.5g / L, can...

example 2

[0021] The weathering crust leaching type (ion adsorption) rare earth ore is subjected to an in-situ leaching process, using 5.0% ammonium chloride solution as the leaching agent 1, and the leaching solution 3 contains a rare earth concentration of 6.8g / L, aluminum: 0.85g / L, and lead: 0.02g / L, copper: 0.02g / L, pH: about 5, ammonia nitrogen: 252g / L, chemical oxygen demand (COD): 115g / L, after neutralization precipitation hydrolysis, multi-stage coagulation, ammonia nitrogen removal, reflux, Aeration, stripping and other processes, supernatant discharge and dosing, detection of rare earth concentration 0.001g / L. Each heavy metal is trace, pH: 9.1, ammonia nitrogen: 25g / L, chemical oxygen demand (COD): 30mg / L. The rare earth recovery rate of the whole process is over 96%, and the water quality has been improved to meet the national second and third level discharge standards. At the same time, using rare earth hydroxides to prepare rare earth chloride feed liquid C RE : 154.54~17...

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Abstract

The invention relates to a method for preparing rare earth by reducing an ammonia nitrogen oxygen demand (COD) and adjusting a potential of hydrogen (pH) value from rare earth mine leach liquor, which is the method for preparing chloride rare earth products from the rare earth mine leach liquor by using lime milk or deposits and treats ammonia nitrogen, chemical oxygen demand (COD), the pH value and the like in dissolved ocyhydrate. The method can be used for environmental protection management, comprehensive utilization and the like, and has the advantages of being small in pollution, low in cost, free of secondary pollution, capable of achieving continuous operation and production and the like.

Description

technical field [0001] The invention belongs to methods such as chemical neutralization, precipitation, clarification, coagulation, aeration, blowing off, etc., and extracts rare earth from rare earth ore leaching liquid to prepare rare earth chloride feed liquid. Especially related to the extraction of rare earths from rare earth leaching solution and raffinate with very low concentration of rare earth elements, reducing ammonia nitrogen, heavy metals, suspended solids, SO 4 2- Etc., adjust the process method of pH value. Background technique [0002] my country's rare earth mineral resources account for 36% of the world's reserves, especially the weathered crust leaching rare earth minerals in the south, which are widely distributed in Jiangxi, Guangdong, Fujian, Guangxi, Hunan, Yunnan and Hainan Island in southern my country, and Vietnam, Myanmar and other countries in Southeast Asia are a kind of weathering crust leaching type rare earth ore composed of ion adsorption t...

Claims

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Application Information

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IPC IPC(8): C22B3/14C22B3/44C22B59/00
CPCY02P10/20
Inventor 郑耀秋
Owner 郑耀秋
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