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
View PDF2 Cites 8 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • 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

Examples

Experimental program
Comparison scheme
Effect test

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...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C22B3/14C22B3/44C22B59/00
CPCY02P10/20
Inventor 郑耀秋
Owner 郑耀秋
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap