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

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...

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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.

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