Device and method for solid-liquid separation in continuous production of rare-earth carbonate

A solid-liquid separation, rare earth carbonate technology, applied in separation methods, filtration separation, chemical instruments and methods, etc., can solve the problems of a large number of transfer tanks, long operation cycle, low efficiency, etc., to reduce labor intensity, reduce labor intensity, The effect of failure point reduction

Pending Publication Date: 2019-01-29
CHINA NORTHERN RARE EARTH (GROUP) HIGH TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] This method makes the whole process intermittent clarification, requires a large number of transfer tanks, has problems such as cumbersome operation, long operation cycle, and low efficiency, and is not suitable for large-scale continuous precipitation production lines.

Method used

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  • Device and method for solid-liquid separation in continuous production of rare-earth carbonate

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Experimental program
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Effect test

Embodiment 1

[0045] The lanthanum chloride feed solution and the precipitating agent ammonium bicarbonate are continuously precipitated and reach the end of the reaction, and the generated slurry enters the 20m 3 The solid-liquid separation tank 1, the flow rate of the entering slurry is 10m 3 / h; turn on the rake agitator 2 to stir, and require the solid-liquid volume ratio of the thick slurry outlet 13 to be 1:2, adjust the frequency of the frequency conversion motor 21 to 4Hz, and control the rotating speed to 6r / min; wait until the liquid level reaches the mother liquor outlet 12 and when the mother liquor flows out, turn on the pump 3 for pumping out the thick slurry, and adjust the frequency of the pump with a frequency converter so that the pumping flow is 3.5m 3 / h, the mother liquor flow rate in the upper part is 6.5m 3 / h;

[0046] The slurry extracted by the thick slurry extraction pump 3 is directly filtered through the vacuum filter 4 to obtain lanthanum carbonate with a tot...

Embodiment 2

[0049] The cerium chloride feed solution and the precipitating agent ammonium bicarbonate are continuously precipitated and reach the end of the reaction, and the generated slurry enters the 20m 3 In the solid-liquid separation tank 1, the incoming slurry flow rate is 12m 3 / h, start the rake agitator 2 to stir, require the solid-liquid volume ratio of the slurry at the thick slurry outlet 13 to be 1:2.5, adjust the frequency of the frequency conversion motor 21 to 5Hz, and control the rotating speed to 8r / min; wait until the liquid level reaches the mother liquor outlet 12 When the mother liquor flows out, turn on the pump 3 for pumping out the thick slurry, and adjust the frequency of the pump with a frequency converter so that the pumping flow is 3.8m 3 / h, the mother liquor flow rate in the upper part is 8.2m 3 / h;

[0050] The slurry extracted by the thick slurry extraction pump 3 is directly filtered through the vacuum filter 4 to obtain cerium carbonate with a total a...

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Abstract

The invention discloses a device for solid-liquid separation in continuous production of rare-earth carbonate. The device comprises a solid-liquid separation tank, a rake type stirrer, a concentratedslurry extraction pump, a vacuum filter and flowmeters; a slurry inlet and a mother liquor outlet are formed in the side wall of the solid-liquid separation tank, and a concentrated slurry outlet is formed in the bottom of the solid-liquid separation tank; the slurry inlet and the mother liquor outlet are both provided with one flowmeter, the concentrated slurry outlet is connected with the vacuumfilter, and a pipeline between the concentrated slurry outlet and the vacuum filter is provided with the concentrated slurry extraction pump and one flowmeter; the bottom of the solid-liquid separation tank is an inverted conical bottom or slope-shaped bottom, and the concentrated slurry outlet is formed in the top end of the conical bottom or the slope-shaped bottom; the rake type stirrer comprises a variable frequency motor, an actuator, a transmission shaft and stirring blades; and the vacuum filter is provided with a rare-earth carbonate outlet and the mother liquor outlet. The inventionfurther discloses a solid-liquid separation method in continuous production of the rare-earth carbonate. According to the invention, continuous automation of a whole process of precipitation and solid-liquid separation can be realized.

Description

technical field [0001] The invention relates to a rare earth hydrometallurgy technology, in particular to a device and method for solid-liquid separation in the continuous production of rare earth carbonate. Background technique [0002] In the production process of rare earth hydrometallurgy, the rare earth precipitation process is an important process of rare earth production. Since the raw material of the precipitation reaction is liquid, it exists in the form of slurry after the reaction, and it needs to be filtered to obtain solid rare earth salts. [0003] Due to different process conditions and raw material concentrations, the volume ratio of solid to mother liquor after the precipitation reaction is about 1:8-1:15. Currently, the filtration facilities used in the rare earth industry include belt filters, centrifuges, and plate-and-frame filter presses. No matter what kind of filtration facility is used, there is a problem that the amount of liquid is large, which re...

Claims

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Application Information

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IPC IPC(8): B01D36/04
CPCB01D36/04
Inventor 张永华赵治华桑晓云侯利生高媛高天佐刘瑞金娄利平孙祥张文斌
Owner CHINA NORTHERN RARE EARTH (GROUP) HIGH TECH CO LTD
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