Treatment method and device for flue gas of rare earth electrolytic cell

A flue gas treatment, electrolyzer technology, applied in the direction of gas treatment, separation methods, chemical instruments and methods, etc., can solve the problem of high energy consumption in flue gas treatment, achieve the effect of increasing operating energy consumption, improving energy consumption, and maintaining heat balance

Inactive Publication Date: 2021-01-12
中铝郑州有色金属研究院有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to improve the dust removal effect, the supporting fan of the cyclone dust collector is often operated at the maximum power, resulting in high energy consumption for flue gas treatment

Method used

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  • Treatment method and device for flue gas of rare earth electrolytic cell

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The embodiment of the present invention provides a rare earth electrolyzer flue gas treatment device, its structure is as follows figure 1 As shown, it includes a bag filter 1, an induced draft fan 4, a desulfurization and defluorination tower 2, and a demisting tower 3 connected in sequence through pipelines. The desulfurization and defluorination tower 2 is provided with a spray layer 21 for spraying lye. The bag dust collector 1, the induced draft fan 4, the desulfurization and defluorination tower 2 and the demisting tower 3 can all use existing equipment, and the specific selection of the present invention is not limited.

[0024] The bag filter 1 is used for dust removal. In this embodiment, the material of the filter bag of the bag filter 1 is one of Flumes, basalt, pre-oxidized silk composite carbon fiber, P84, and PTFE coating, and the temperature resistance is guaranteed to reach 200 Above ℃, avoid burning bag caused by high temperature gas. see figure 1 , t...

Embodiment 2

[0029] This embodiment provides a method for treating flue gas from a rare earth electrolytic cell. This method is implemented in the flue gas treatment device of a rare earth electrolytic cell in the above-mentioned embodiment 1, which can recover the valuable rare earth raw materials in the flue gas to the greatest extent, and make the Emissions meet environmental protection requirements.

[0030] see figure 1 , the method specifically includes the following steps:

[0031] (1) Use the bag filter 1 to cooperate with the induced draft fan 4 for dust removal, and the processing air volume of the bag filter 1 is 850-4600m 3 / h, for example 900m 3 / h, 1150m 3 / h, 1500m3 / h, 1800m 3 / h, 2050m 3 / h, 2100m 3 / h, 2220m 3 / h, 2350m 3 / h, 2450m 3 / h, 2750m 3 / h, 3150m 3 / h, 3600m 3 / h, 4000m 3 / h, 4350m 3 / h etc. The filtering wind speed of the bag filter 1 is 0.3-2.5m / min, such as 0.33m / min, 0.42m / min, 0.5m / min, 0.6m / min, 0.75m / min, 0.85m / min, 1.2m / min , 1.6m / min, 1.9...

Embodiment 3

[0037] This embodiment provides a method for treating flue gas from a rare earth electrolytic cell, which is implemented in the device for treating flue gas from a rare earth electrolytic cell in the above embodiment 1, see figure 1 , the method specifically includes the following steps:

[0038] (1) The flue gas produced in the upper part of the rare earth electrolytic cell 11 is collected into the smoke exhaust pipe 10, and the flow rate of the fan 4 is controlled to 3400m 3 / h, the power is 4.3kW, the total pressure is 2300Pa, which can reduce the temperature of the flue gas in the exhaust pipe 10 before entering the bag filter 1 to 160°C, and the cooled flue gas enters the bag filter 1, and the filter bag The effective area is 55 square meters, the material of the filter bag is Flumes, the effective wind speed of the filter bag is 0.6m / min, and the processing air volume is 2300m 3 / h, and adopts the pulse cleaning system program combining the fixed difference pressure con...

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Abstract

The invention discloses a treatment method and device for flue gas of a rare earth electrolytic cell. The device comprises a bag-type dust collector, an induced draft fan, a desulfurization and defluorination tower and a demisting tower which sequentially communicate with each other through a pipeline. The method comprises the following steps: conducting dust removal through cooperation between the bag-type dust collector and the induced draft fan, wherein the filtering air speed of the bag-type dust collector ranges from 0.3 m/min to 2.5 m/min, and a treatment air volume ranges from 850 m<3>/h to 4600 m<3>/h; introducing the dedusted flue gas into the desulfurization and defluorination tower; introducing the flue gas treated by the desulfurization and defluorination tower into the demisting tower, and directly discharging tail gas obtained after treatment by the demisting tower into the atmosphere. According to the invention, the technological parameters of dust removal are designed according to energy balance of the electrolytic cell, stable operation and production of the electrolytic cell are guaranteed, operation energy consumption of the electrolytic cell is not increased, the dust concentration of an outlet of the bag-type dust collector is smaller than or equal to 5 mg/m<3> and far lower than the emission standard that a dust concentration is smaller than or equal to 50mg/m < 3 >, rare earth raw materials can be recycled to the maximum extent, and production cost is saved.

Description

technical field [0001] The application belongs to the technical field of rare earth molten salt electrolysis, and in particular relates to a method and device for treating flue gas of a rare earth electrolytic cell. Background technique [0002] At present, the production of rare earth metals and their alloys mainly adopts the molten salt electrolysis method, using rare earth oxides as raw materials and rare earth fluorides as electrolytes, and the electrolysis temperature is above 1050°C. During the electrolysis process, the anode will generate a large amount of CO, CO 2 Gas, especially under high temperature conditions, fluoride salts are continuously volatilized, and at the same time, fine rare earth oxides are taken away. A large amount of harmful gas and dust discharged not only causes environmental pollution and endangers human health, but also causes waste of expensive rare earth oxide raw materials, reduces the yield of rare earth, and increases production costs. T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D46/02B01D46/04B01D53/50B01D53/68B01D53/78B01D53/96
CPCB01D46/02B01D46/04B01D53/501B01D53/68B01D53/78B01D53/96B01D53/26B01D2258/0283B01D2257/80
Inventor 史志荣冷正旭杨杰柴登鹏张亚楠李冬生梁玉冬白卫国李静张旭贵
Owner 中铝郑州有色金属研究院有限公司
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