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Rare-earth organic extractant and back-extraction process thereof

An organic extractant and rare earth organic technology, which is applied in the field of rare earth organic extractant and its stripping process, can solve the problem that the stripping rate of rare earth oxalate particle size needs to be improved, so as to reduce industrial costs, high stripping rate, and reduce The effect of acid consumption

Inactive Publication Date: 2014-02-26
JIANGXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, from the perspective of unsaponified rare earth-loaded organic reverse extraction and subsequent precipitation processes, the stripping rate and the particle size of rare earth oxalate still need to be improved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Example 1: Take the loaded organic phase after extraction (the concentration of La is 0.0593mol / L, wherein the organic phase volume ratio is 30% cyclohexane+15%P507+35%N235+20% sulfonated kerosene); using 3.0 mol / L hydrochloric acid back extraction (comparison 1:1), make a mixed solution, put it in a separatory funnel, shake it on an oscillator for 1 minute, then move it to the stand, and observe it statically, and separate the phases in 0-1 minute , the phase separation speed is slightly slow, the interface is clear, the water phase is clear, and the calculated stripping rate is 98.02%.

Embodiment 2

[0018] Embodiment 2: Take the loaded organic phase after extraction (the concentration of La is 0.0976 mol / L, wherein the organic phase volume ratio is 20% cyclohexane+45%P2O4+15%N235+20% sulfonated kerosene); using 2.5 mol / L hydrochloric acid back-extraction (compared to 1:1.2), made into a mixed solution, put it in a separatory funnel, placed it on a shaker for 25 minutes, then moved it to the stand, and stood it for observation, its 0-1min is extremely fast Phase separation, the phase separation effect is very good, the water phase is clear, and the calculated stripping rate is 98.48%.

Embodiment 3

[0019] Embodiment 3: take the loaded organic phase after extraction (the concentration of La is 0.1566 mol / L, wherein the volume ratio of the organic phase is 20% cyclohexane+35%P507+30%N235+20% sulfonated kerosene); using 3.5 mol / L hydrochloric acid back-extraction (compared to 1:1), made into a mixed solution, put it in a separatory funnel, placed it on a shaker and oscillated for 40 minutes, then moved it to the stand, stood it for observation, and it clarified quickly in 0-1 minute , the interface is clear, the water phase is clear, and the calculated stripping rate is 99.04%.

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Abstract

The invention discloses a rare-earth organic extractant and a back-extraction process thereof. The organic extractant contains the ingredients in percentage by volume: 20-35% of cyclohexane, 15-45% of liquid ammonia saponification extractant, 15-35% of N235 and 20-40% of sulfonated kerosene, wherein the liquid ammonia saponification extractant is either P507 or P204. The back-extraction process comprises the steps of preparing loading organic phases containing different rare earth concentrations through extraction, back-extracting and precipitating, thereby obtaining rare-earth oxalate with large grain diameter. A non-saponification extraction system is provided by the invention, and near-zero emission of ammonia nitrogen is realized; the back-extraction process disclosed by the invention has the advantages of high phase separation speed, obvious two-phase boundary and high back-extraction ratio; and a crystal is not deposited on a bottom plate of a back-extraction tank and does not scar on the periphery.

Description

technical field [0001] The invention belongs to the field of metallurgy and chemical industry, and relates to a rare earth organic extractant and a stripping process thereof. Background technique [0002] Gannan ionic rare earth ores are mostly medium-heavy rare earth ores. Extractants such as ammonia water or liquid ammonia saponified P507 and P204 are often used to extract and separate rare earth elements in a hydrochloric acid system. However, this process has a large amount of acid and alkali, high cost, and waste water issues such as large emissions. With the continuous improvement and update of extraction and separation technology, the concept of saponification-free extraction is proposed, which can save nearly 30% of acid and alkali consumption compared with the original process, and greatly reduce industrial costs. Solve the problem of ammonia nitrogen pollution in the process of saponification and extraction at the source, and realize no ammonia emission. However,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/40C22B59/00
CPCY02P10/20
Inventor 叶信宇吴迪吴龙杨明杨幼明聂华平蓝桥发
Owner JIANGXI UNIV OF SCI & TECH
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