Deep purification device and method of electrolytic aluminum exhaust gas

A technology for deep purification of flue gas and electrolysis of aluminum, applied in chemical instruments and methods, separation methods, gas treatment, etc., can solve problems such as difficulty in implementation, high investment and operation costs, secondary pollution, etc., and achieve improved operation stability and investment Low operating cost and avoid freezing damage

CN110026076APending Publication Date: 2019-07-19内蒙古霍煤创源矿业有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2019-07-19

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Abstract

The invention discloses a deep purification device and method of electrolytic aluminum exhaust gas. An electrolytic aluminum purification tower is provided with a gypsum slurry circulating region, aninlet flue, a spray layer of the purification tower, a first demister of the purification tower, a liquid accumulation layer of the purification tower, a condensation spray layer of the purification tower, a second demister of the purification tower and a purification tower outlet from bottom to top; the gypsum slurry circulating region is communicated with the spray layer of the purification tower through a purification tower circulating pump; the outlet end of the liquid accumulation layer of the purification tower is communicated with the gypsum slurry circulating region and a limestone slurry circulating tank; the limestone slurry circulating tank is communicated with the condensation spray layer of the purification tower through a circulating cooling tower; the limestone slurry circulating tank and the gypsum slurry circulating region are communicated with a limestone slurry source; and the gypsum slurry circulating region is communicated with a gypsum slurry treatment system. Byfull use of a limestone slurry preparation system in a gas desulfurization system of an original power plant and an auxiliary system of a byproduct treatment system, the deep purification device adopts two-stage wet washing process to perform low-cost deep purification on the electrolytic aluminum exhaust gas purified by a dry method.
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Description

technical field

[0001] The invention belongs to the technical field of resources and environmental protection, and in particular relates to a deep purification device and method for electrolytic aluminum flue gas. Background technique

[0002] During the production of electrolytic aluminum, the flue gas produced contains a large amount of HF and SO 2 , particulate matter and other pollutants, direct discharge will seriously endanger human health and plant growth, so the electrolytic aluminum flue gas must be purified. The electrolytic aluminum flue gas purification method is divided into wet purification and dry purification. The wet purification system is suitable for soluble gases such as SO 2 The capture efficiency of gaseous pollutants such as HF and HF is relatively high, but the purification efficiency is low due to the unsatisfactory gas-liquid separation, the removal efficiency of fine particles is not high, the water consumption is large, the equipment is severely ...

Examples

Embodiment Construction

[0027] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relationship between the components in a certain posture (as shown in the accompanying drawings). Relative positional relationship, movement conditions, etc., if the specific posture changes, the directional indication will also change accordingly.

[0028] like figure 1As shown, the present invention provides a deep purification device for electrolytic aluminum flue gas, including an electrolytic aluminum purification tower 1, a purification tower circulation pump 2, a condensation circulation pump 14, a limestone slurry pump 15, a limestone slurry circulation box 3, and a circulation cooling tower 4 , Limestone slurry storage tank 5 and gypsum slurry processing system, the electrolytic aluminum purification tower 1 is respectively provided with a gypsum slurry circulation area 101, an inlet flue 10...