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A mixer-settler, an arrangement comprising at least two mixer-settlers and a method for measuring and controlling the volumetric o/a ratio and phase disengagement time of organic and aqueous phases in a dispersion

A technology of mixer and settler, applied in the equipment field of mixer and settler

Inactive Publication Date: 2013-04-24
OUTOTEC OYJ
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The problem is that if the speed of the pump mixer or the opening position of the internal recirculation valve is changed, the level of the organic tank in the previous stage will also change, and further iterations of speed and valve position are often required to achieve the desired internal O / A Ratio and slot level target values

Method used

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  • A mixer-settler, an arrangement comprising at least two mixer-settlers and a method for measuring and controlling the volumetric o/a ratio and phase disengagement time of organic and aqueous phases in a dispersion

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Embodiment Construction

[0088] The accompanying drawing is a schematic diagram of a mixer-settler comprising: a pump mixer unit 1; a liquid-liquid extraction settler 2; and an apparatus 3 configured to measure the volumes of an organic phase O and an aqueous phase A in a dispersion O / A ratio and phase separation time PDT. The dispersion is prepared by the pump mixer unit 1 . Unit 1 comprises a dispersion overflow pump DOP followed by two mixers. From the last mixer the dispersion is supplied to the settler via the intake channel 4 .

[0089] The measuring device 3 comprises a measuring chamber 5 arranged to receive a sample of the dispersion for measuring the O / A ratio and the phase separation time. The device 3 also comprises an inlet channel 6 having a first end 7 opening into the intake channel 4 and a second end 8 opening into the measurement chamber 5, said inlet channel forming a channel for the sample to flow into the measurement chamber. aisle. The outlet channel 9 has a third end 10 whic...

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Abstract

The present invention concerns a mixer-settler, an arrangement comprising a train of at least two mixer-settlers and a method for measuring and controlling volumetric O / A ratio and phase disengagement time of organic and aqueous phases in a dispersion. A continuous flow of dispersion is led via an inlet channel (6) from the uptake channel (4) though a measurement chamber (5) to an outlet channel (9) which leads the flow to the pump-mixer unit (1). At predetermined time intervals the continuous flow of dispersion is interrupted by closing the inlet and outlet valves (12, 13) to retain a sample of dispersion in the measurement chamber (5) for the measurement of the O / A ratio and phase disengagement time.

Description

technical field [0001] The invention relates to a mixer-settler according to claim 1 . Furthermore, the invention relates to an arrangement of a mixer-settler according to claim 12 . Furthermore, the invention relates to a method according to claim 13 . Background technique [0002] One of the common operational tasks in a solvent extraction (SX) plant is to measure the internal O / A ratio in each stage (typically every two hours). The O / A ratio is the volume ratio of the volume of the organic phase to the volume of the aqueous phase. If the ratio deviates from the target value, adjustments are required to achieve the target O / A ratio and maintain operating conditions. [0003] Currently, the sampling of the dispersion for measurement and the measurement of the internal O / A ratio are manual tasks. Samples were taken manually from the uptake channel or the final mixer tank, and then, the organic / water volume ratio was calculated using a clear flask. During the same run, t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D11/04B01D17/02G05D11/13
CPCB01D11/0446G01N1/10B01D11/0484G05D11/133B01D11/0457B01D17/0208G05D11/131B01D11/04B01D17/02G05D11/13
Inventor J·乌尔苏亚
Owner OUTOTEC OYJ