Method and apparatus for purifying phosphoric acid solutions

A technology of phosphoric acid solution and oxalic acid solution, applied in chemical instruments and methods, separation methods, radioactive purification, etc., can solve the problems of unrealizable, small revenue of mobile equipment, etc., and achieve the effect of reducing the working volume

Active Publication Date: 2017-03-15
BABCOCK NOELL GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Gains of this type of mobile equipment using lower amounts of phosphoric acid are small and almost unattainable

Method used

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  • Method and apparatus for purifying phosphoric acid solutions

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Embodiment Construction

[0032] Shown in the drawing is a plant for purifying a phosphoric acid solution 3b comprising a purifying tank 4 in which phosphoric acid containing dissolved iron(II) and iron(III) is present. The phosphoric acid is fed via pipes and pumps to a multistage mixer 10 in which an agitator 20 is arranged. Oxalic acid 9 is pumped into a multistage mixer 10 from another container. An overflow opening 16 is provided between the container and the multistage mixer 10 . From the mixer 10 is pumped diluted phosphoric acid 3 which reaches a settling tank 11 in which diluted phosphoric acid 3 and iron oxalate deposits 1 are produced by a settling process. On the lower part of the settling tank 11 there is a vibration mechanism 17 . The vibrating mechanism ensures that the sediment does not solidify and can be drained completely downwards. Below the settling tank 11 there is provided a heater, which is a belt furnace 2 and in the present case a plurality of heating elements 18 above the ...

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Abstract

The invention relates to a method for recovering phosphoric acid solution contaminated with radioactive components from a purification tank (4), wherein the spent phosphoric acid solution is diluted with an aqueous oxalic acid solution in order to simultaneously separate iron oxalate and use the phosphoric acid solution for purification of further plant parts, wherein the iron ion content of phosphoric acid (3b) in the purification tank (4) is continuously measured, and phosphoric acid (3b) is continuously extracted from the purification tank (4) and replaced with concentrated and purified Phosphoric acid (3a) instead, so that a defined concentration of dissolved iron in the polluted tank (4) is not exceeded, and a device for carrying out the method. This solution has the advantage that only a small amount of phosphoric acid solution circulates in the plant for recovering phosphoric acid solution from the purification tank, the necessary working volume in the installation tank being significantly reduced. The resulting possibility is that Fe(II) ions can be removed from phosphoric acid solutions by electrochemical purification using mobile devices.

Description

technical field [0001] The invention relates to a method for cleaning phosphoric acid melts and a device for carrying out the method. [0002] The present invention can be applied in all cases where iron(II) ions are present in phosphoric acid solutions when chemically and / or electrochemically decontaminating the surface of equipment parts subject to radioactive contamination; and iron(II) ions need to be removed from phosphoric acid solutions. ) ions, whereby the phosphoric acid solution can be used again to decontaminate radioactively contaminated plant parts. [0003] The invention is particularly suitable for use in small and mobile installations in which phosphoric acid in a purification tank is continuously purified and re-transmitted to the tank. Background technique [0004] Phosphoric acid electrolyte cells have been used for electrochemical purification for a long time. After prolonged use, the iron content and radioactivity in the electrolytic solution rises. I...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B25/234C01B25/238G21F9/00B01D21/00
CPCC01B25/234C01B25/238G21F9/002B01D21/283C02F11/13B01D21/00G21F9/00C02F1/5272
Inventor G·埃德勒
Owner BABCOCK NOELL GMBH
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