Flaky crystal form rare earth carbonate countercurrent washing system

Abstract

The utility model discloses a rare earth washing system, and particularly relates to a flaky crystal form rare earth carbonate countercurrent washing system. The device is formed by connecting a four-stage filter press, a three-time washing tank and two buffer tanks through a pipeline, wherein a filter pump and an infusion pump are arranged on the pipeline. Slurry containing rare earth carbonate is filtered from front to back through a four-stage filter press, rare earth carbonate filter residues are washed by washing liquid from back to front step by step, washing is completed under the condition of saving most water resources, and the system is less in investment for small-scale production, is more suitable for filtering of flaky crystal forms, is fewest in labor allocation personnel, and is suitable for large-scale production. The washing device has an excellent washing effect on the flaky crystal form rare earth carbonate solid.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of washing systems of rare earth, in particular to a kind of countercurrent washing system to flaky crystal form carbonates of rare earth in the process of producing carbonates of rare earth using electrolytic method. BACKGROUND

[0002] Electrolytic production of carbonates of rare earth is the frontier technology of rare earth industry, breaks the high pollution, high cost, product purity barrier such as insufficient of traditional scheme, will bring revolutionary change to the entire rare earth industry. Traditional carbonates of rare earth production is through chemical method, the carbonates of rare earth crystal generated is in granular state, it is relatively easy to wash and filter. Although the use of electrolytic production of carbonates of rare earth is less polluted, product quality is better, but the carbonates of rare earth crystal generated in electrolytic cell is flaky, not easy to wash and filter, and the yield and scale of rare earth industry are generally small, not suitable for application of large washing and filtering equipment, for this situation, the utility model combines theory and experience and designs a set of systematic scheme for countercurrent washing. SUMMARY

[0003] The technical problem to be solved by the utility model is to provide a kind of countercurrent washing system of flaky crystal form carbonates of rare earth, it has the characteristics of simple operation, low equipment cost, water saving, good washing effect.

[0004] To solve the above technical problem, the utility model is realized by the following technical scheme:

[0005] The countercurrent washing system of flaky crystal form carbonates of rare earth is connected by four-stage filter press, three washing tanks and two buffer tanks through pipeline, and filter pump and infusion pump are arranged on the pipeline.

[0006] Preferably, the specific structure of the above-mentioned countercurrent washing system of flaky crystal form carbonates of rare earth is as follows: the carbonates of rare earth slurry conveying pipeline is communicated with the feed inlet of the first-stage filter press through the first filter pump, the filtrate outlet of the first-stage filter press is communicated with the cathode liquid circulating tank through the conveying pipeline, the filter residue outlet of the first-stage filter press is communicated with the primary washing tank through the conveying pipeline, the washing liquid inlet of the primary washing tank is communicated with the first buffer tank through the conveying pipeline, and the inlet end of the first buffer tank is communicated with the self-heating water pipe and the filtrate conveying pipeline of the third-stage filter press.

[0007] Preferably, the slurry outlet of the above-mentioned primary washing tank is communicated with the second-stage filter press through the second washing pump and the conveying pipeline, the filter residue outlet of the second-stage filter press is communicated with the secondary washing tank through the conveying pipeline, the washing inlet of the secondary washing tank is communicated with the second buffer tank through the conveying pipeline, and the inlet end of the second buffer tank is communicated with the self-heating water pipe and the filtrate conveying pipeline of the fourth-stage filter press.

[0008] Preferably, the slurry outlet of the secondary washing tank is communicated with a third washing filter through a conveying pipeline and a third washing pump, and the filter residue outlet of the third washing filter is communicated with a tertiary washing tank.

[0009] Preferably, the washing liquid inlet of the tertiary washing tank is connected with a hot water pipe, the slurry outlet of the tertiary washing tank is communicated with a fourth washing filter through a conveying pipeline and a fourth washing pump, and the fourth washing filter is provided with a discharge outlet.

[0010] Preferably, the filter pump is a pneumatic diaphragm pump, and the filter pump is connected with a compressed air source.

[0011] Preferably, the washing pump is a pneumatic diaphragm pump, and the washing pump is connected with a compressed air source.

[0012] Preferably, the filtrate outlets of the primary washing tank and the secondary washing tank are communicated with a waste water treatment device.

[0013] Due to the above technical scheme, the utility model has the following characteristics and effects:

[0014] In the utility model, the carbonic acid rare earth slurry is filtered from front to back through the fourth washing filter, and the washing liquid is used to wash the carbonic acid rare earth filter residue from back to front, so that the washing is completed under the condition of saving water resources, and 40% of washing water is saved. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is a structure schematic view of the countercurrent washing system of the flaky crystal type carbonic acid rare earth of the utility model.

[0016] In the drawing: 1, first washing filter; 2, first filter pump; 3, first buffer tank; 4, primary washing tank; 5, second washing filter; 6, second washing pump; 7, second buffer tank; 8, secondary washing tank; 9, third washing filter; 10, third washing pump; 11, tertiary washing tank; 12, fourth washing filter; 13, fourth washing pump. DETAILED DESCRIPTION

[0017] The technical scheme in the embodiments of the utility model will be apparently and completely described in combination with the drawings in the embodiments of the utility model, and apparently, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative labor belong to the protection scope of the utility model.

[0018] As Figure 1As shown, the utility model discloses a flaky crystal type rare earth carbonate countercurrent washing system, and the structure is as follows: the rare earth carbonate slurry conveying pipeline is communicated with the feed inlet of the first filter press 1 through the first filter pump 2, the filtrate outlet of the first filter press 1 is communicated with the cathode liquid circulating tank through the conveying pipeline, the filter residue outlet of the first filter press 1 is communicated with the primary washing tank 4 through the conveying pipeline, the washing liquid inlet of the primary washing tank 4 is communicated with the first buffer tank 3 through the conveying pipeline, the inlet end of the first buffer tank 3 is communicated with the hot water pipe and the filtrate conveying pipeline of the third filter press 9 respectively, the filtrate outlet of the primary washing tank 4 is communicated with the waste water treatment equipment, the slurry outlet of the primary washing tank 4 is communicated with the second filter press 5 through the conveying pipeline through the second washing pump 6, the filter residue outlet of the second filter press 5 is communicated with the secondary washing tank 8 through the conveying pipeline, the washing inlet of the secondary washing tank 8 is communicated with the second buffer tank 7 through the conveying pipeline, the inlet end of the second buffer tank 7 is communicated with the hot water pipe and the filtrate conveying pipeline of the fourth filter press 12 respectively, the filtrate outlet of the second filter press 5 is communicated with the waste water treatment equipment, the filtrate outlet of the secondary washing tank 8 is communicated with the waste water treatment equipment, the slurry outlet of the secondary washing tank 8 is communicated with the third filter press 9 through the conveying pipeline through the third washing pump 10, and the filter residue outlet of the third filter press 9 is communicated with the tertiary washing tank 11; the washing liquid inlet of the tertiary washing tank 11 is connected with the hot water pipe, the slurry outlet of the tertiary washing tank 11 is communicated with the fourth filter press 12 through the conveying pipeline through the fourth washing pump 13, and the fourth filter press 12 is provided with a discharge port.

[0019] The first filter pump 2, the second washing pump 6, the third washing pump 10 and the fourth washing pump 13 are pneumatic diaphragm pumps.

[0020] The working principle of the utility model is as follows:

[0021] The rare earth carbonate slurry enters the first filter press 1 through the first filter pump 2, and the filtrate produced after pressure filtration is returned to the catholyte circulation tank through the pipeline for use in blending, and the filter residue after pressure filtration enters the primary washing tank 4, and the washing liquid in the primary washing tank 4 comes from the first buffer tank 3, and the washing liquid of the first buffer tank 3 comes from the hot water pipe at the initial start, and the subsequent washing liquid comes from the filtrate of the third-stage filter press 9; after stirring and washing, the slurry in the primary washing enters the second filter press 5 through the second washing pump 6, and the filtrate produced in the primary washing is discharged to the wastewater treatment, and the primary washing filter residue enters the secondary washing tank 8 for washing, and the washing liquid in the secondary washing tank 8 comes from the second buffer tank 7, and the initial washing liquid of the second buffer tank 7 comes from the hot water pipe, and the subsequent washing liquid comes from the fourth-stage filter press 12; after stirring and washing again, the slurry in the secondary washing tank 8 enters the third-stage filter press 9 through the third washing pump 10, the filtrate of the third-stage filter press 9 enters the conveying pipeline and is sent into the first buffer tank 3, and the rare earth carbonate filter residue of the third-stage filter press 9 enters the tertiary washing tank 11; the washing liquid inlet of the tertiary washing tank 11 always comes from the new water supplied by the hot water pipe, and after stirring and washing, it is pumped into the fourth-stage filter press 12 through the fourth washing pump 13, the filtrate of the fourth-stage filter press 12 is sent into the second buffer tank 7 through the conveying pipeline, and the filter residue at the discharge port of the fourth-stage filter press 12 is the finished product of flaky crystal rare earth carbonate, which is unloaded and packed for the next process.

Claims

1. A countercurrent scrubbing system for plate-like crystalline rare earth carbonates, characterized in that... It consists of a four-stage filter press, a three-stage washing tank, and two buffer tanks connected by pipelines. A filter pump and a liquid delivery pump are installed on the pipelines. The rare earth carbonate slurry delivery pipeline is connected to the inlet of the first-stage filter press (1) via the first filter pump (2). The filtrate outlet of the first-stage filter press (1) is connected to the cathode liquid circulation tank via a delivery pipeline. The filter residue outlet of the first-stage filter press (1) is connected to the first washing tank (4) via a delivery pipeline. The washing liquid inlet of the first washing tank (4) is connected to the first buffer tank (3) via a delivery pipeline. The inlet end of the first buffer tank (3) is connected to the self-heating water pipe and the filtrate delivery pipeline of the three-stage filter press (9) respectively.

2. The plate-like crystalline rare earth carbonate countercurrent washing system according to claim 1, characterized in that... The slurry outlet of the primary washing tank (4) is connected to the secondary filter press (5) via the second washing pump (6) through the conveying pipeline. The filter residue outlet of the secondary filter press (5) is connected to the secondary washing tank (8) through the conveying pipeline. The washing inlet of the secondary washing tank (8) is connected to the second buffer tank (7) through the conveying pipeline. The inlet end of the second buffer tank (7) is connected to the self-heating water pipe and the filtrate conveying pipeline of the fourth-stage filter press (12) respectively.

3. The plate-like crystalline rare earth carbonate countercurrent washing system according to claim 2, characterized in that... The slurry outlet of the secondary washing tank (8) is connected to the tertiary filter press (9) via a conveying pipeline and a third washing pump (10). The filter residue outlet of the tertiary filter press (9) is connected to the tertiary washing tank (11).

4. The plate-like crystalline rare earth carbonate countercurrent washing system according to claim 3, characterized in that... The washing liquid inlet of the three-stage washing tank (11) is connected to the self-heating water pipe, and the slurry outlet of the three-stage washing tank (11) is connected to the fourth-stage filter press (12) through the conveying pipeline via the fourth washing pump (13). The fourth-stage filter press (12) is provided with a discharge port.

5. The plate-like crystalline rare earth carbonate countercurrent washing system according to claim 1, characterized in that... The filter pump is a pneumatic diaphragm pump, which is connected to a compressed air source.

6. The plate-like rare earth carbonate countercurrent washing system according to claim 2, 3 or 4, characterized in that... The washing pump is a pneumatic diaphragm pump, which is connected to a compressed air source.

7. The plate-like rare earth carbonate countercurrent washing system according to claim 3, characterized in that... The filtrate outlets of the primary washing tank (4) and the secondary washing tank (8) are connected to a wastewater treatment device.

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