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An organic extractant and saponification technology, applied in chemical instruments and methods, inorganic chemistry, sulfur compounds, etc., to achieve the effect of solving external pollution
Inactive Publication Date: 2010-04-21
王梓柱
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Problems solved by technology
[0015] In order to overcome the deficiencies in the saponification method of the existing rare earth organic extractant, the present invention proposes a saponification method of the organic extractant
Method used
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Examples
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example 1
[0043] The preparation of extractant lanthanum soap in example 1, lanthanum cerium separation flow process
[0045] Organic extractant: 1.45mol / l P 507 Kerosene solution flow rate: 120l / min
[0046] Lanthanum chloride: 1.64mol / l Flow rate: 12.8l / min
[0047] The above materials have undergone 6-stage countercurrent saponification, the average mixing time is 3.3×6=19.8min, the clarification time is 55min, the concentration of rare earth soap after equilibrium is 0.167-0.172mol / l, and the concentration of rare earth in the raffinate aqueous barium chloride is less than 0.02mol / l l.
example 2
[0048] The preparation of example 2 cerium-praseodymium grouping rare earth soaps
[0050] Organic extractant: 1.5mol / l P 507 Kerosene thinner flow rate: 40l / min
[0051] Lanthanum cerium chloride concentration 1.5mol / l Flow rate: 3.8l / min
[0052] The above materials are continuously introduced into the primary mixing chamber of the saponification tank for full mixing reaction, co-flow extraction and saponification in a 3-stage mixing-settling tank, and 2-stage clarification. After saponification, the concentration of the rare earth organic soap is 0.143mol / l. The rare earth content in the raffinate aqueous barium chloride solution is less than 0.015 mol / l.
example 3
[0053] The preparation of extractant lanthanum cerium rare earth soap in example 3, cerium praseodymium grouping
[0054] BaS concentration: 0.9M Flow rate: 9.82l / min
[0055] Organic extractant: 1.5mol / l P 507 Kerosene solution flow rate: 40l / min
[0056] Lanthanum cerium chloride: 1.55mol / l Flow rate: 3.8l / min
[0057] Import the above materials into the saponification tank at the same time, react continuously in countercurrent, mix for 3.5×4min, clarify for 50min, and balance, the measured rare earth soap is 0.135-0.146mol / l. / l.
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PUM
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Abstract
The invention relates to a method for saponifying an organic extracting agent. One or more combination of P507, P204, P229, naphthenic acid and C301 is / are dissolved and diluted with alkane, kerosene and organic alcohol and then used as the organic extracting agent; BaCO3 or BaS aqueous solution is used as a saponifying agent for the organic extracting agent; hydrochloride or nitric acid extracting solution of rare-earth is used as rare-earth salt solution; and the rare-earth salt solution is converted into rare-earth saponified substance used for separating rare-earth metals by adopting single-stage saponification, co-flowing continuous saponification or reflux continuous saponification. The method has the advantages that the problem of external emission pollution of the extraction aqueous phase during rare-earth saponification is radically solved by adopting barium carbonate or barium sulfide as the saponifying agent for the organic extracting agent, meanwhile the acidity of the extracting agent is effectively utilized, and a barium chloride or sodium hydrosulfide product of senior industrial grade is obtained. The method is applicable in the rare-earth field of extracting the rare-earth metals by saponifying the extracting agent.
Description
technical field [0001] The invention relates to a saponification method of an organic extractant in the field of extraction and separation of rare earth metals. Background technique [0002] At present, the method for extracting rare earth metals from rare earth ores is as follows: 1. Firstly, the rare earth is reacted with acid or alkali to convert it into a rare earth salt that can be dissolved in water to make a rare earth aqueous solution. 2. The organic extractant used for rare earth metal extraction is subjected to saponification reaction with alkaline substances to generate organic soap. 3. React the rare earth aqueous solution with organic soap to form rare earth soap, and then extract rare earth elements. [0003] Rare earth salts are usually hydrochlorides, nitrates or sulfates of rare earths. [0004] The used alkaline substance of saponification reaction is ammonia water, sodium hydroxide or ammonium bicarbonate etc. as saponification agent. [0005] Commonly ...
Claims
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