Method and device for treating carbon residues and recycling electrolyte

An electrolyte and carbon slag technology, which is applied in the field of carbon slag recovery electrolyte, can solve the problems of roasting furnace corrosion, high cost, short life, etc., and achieve the effect of low impurity content and high recovery rate

Active Publication Date: 2021-10-08
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Roasting at high temperature, the electrolyte in the carbon residue will volatilize and be discharged with the flue gas, which will cause secondary environmental protection problems
In addition, HF, a strong corrosive substance, will be generated, and the roaster will be severely corroded, and its life is very short.
Therefore, the traditional fire treatment environment is harsh and the cost is high

Method used

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  • Method and device for treating carbon residues and recycling electrolyte
  • Method and device for treating carbon residues and recycling electrolyte
  • Method and device for treating carbon residues and recycling electrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] At the flue end of a 400kA electrolytic cell in an electrolytic aluminum enterprise, a combustion box is installed, such as figure 1 shown. The 400kA electrolyzer produces a total of about 30kg of carbon residue per day (about 10kg per 8 hours).

[0069] 1) The charcoal slag to be treated produced after the electrolysis of the electrolytic cell is crushed so that its particle size is less than 12 cm. Mix the charcoal slag particles and sodium carbonate with a mixer according to the mass ratio of 3:100 to form the first mixture, and pack them in three trays 113, each tray 113 is loaded with 4kg, and the charcoal slag is flattened, and the flattened thickness is less than 5cm ;

[0070] 2) Put the tray 113 into the combustion chamber of the combustion chamber 101, and close the chamber door;

[0071] 3) Open the valve 105 on the exhaust pipe 103, so that the high-temperature flue gas discharged from the fire hole at the flue end of the electrolytic cell enters the comb...

Embodiment 2

[0076] In the reserved area of ​​a work area of ​​a 400kA electrolytic workshop of an electrolytic aluminum enterprise, a centralized combustion box is set up, such as Figure 3-4 shown.

[0077] There are 36 sets of 400kA electrolytic cells in this work area, which produce about 360kg of carbon residue every 8 hours, and a total of about 1080kg of carbon residue is produced every day.

[0078] 1) Place the charcoal slag in the whole work area of ​​the electrolysis workshop in the charcoal slag box 117, and the charcoal slag is crushed in the crusher 118 to become charcoal slag particles with a particle size of less than 12mm; the gas collecting pipe 120 is opened during the crushing process to discharge the smoke to In the flue gas pipe 104.

[0079] 2) Mix the crushed charcoal slag into the industrial AlF which accounts for 5% of the mass of the charcoal slag 3 and calcium carbonate accounting for 1% of the mass of charcoal slag, mixed to form the first mixture, loaded int...

Embodiment 3

[0088] Embodiment 3 takes embodiment 1 as a reference, and embodiment 3 is different from embodiment 1 in that:

[0089] The surface of the first mixture was sprayed with 30% hydrogen peroxide in the mass fraction of sodium carbonate, the mass ratio of carbon residue particles to sodium carbonate was 5:100, the heating temperature was 610°C, and the rest were the same as in Example 1.

[0090] Processing effect:

[0091] 1) Treat 3 heats per day, and process all the charcoal slag in this tank, totaling about 30kg, and recover about 21.8kg of electrolyte accumulatively. The auxiliary heating system consumes about 24kwh of alternating current accumulatively every day, and the average power consumption per kilogram of carbon residue is 0.8kwh / kg.

[0092] 2) Sampling the recovered electrolyte and analyzing the carbon content, the carbon content is about 0.191%, which is basically equivalent to the carbon content analysis result of the electrolyte in the electrolytic cell.

[00...

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Abstract

The invention discloses a method and a device for treating carbon residues and recycling electrolyte. The method comprises the following steps: obtaining the electrolyte-containing carbon residues with the particle size of less than or equal to 12cm; mixing an additive containing carbonate with the carbon residues to obtain a first mixture; and heating the first mixture to the temperature larger than or equal to 560 DEG C and smaller than 650 DEG C through high-temperature flue gas exhausted by a fire hole of an electrolytic cell, the combustion reaction time is larger than or equal to 6 h, and therefore the carbon residues are treated, and the electrolyte is recycled. By adopting the method disclosed by the invention, the recovery rate of the electrolyte in the carbon residues is 98.07-98.68%, the recovery rate is high, the carbon content is 0.18-0.2%, the impurity content is low, and an electrolytic aluminum workshop does not discharge hazardous waste of the carbon residues; and the method fully utilizes the waste heat of the electrolytic cell and does not generate secondary pollution, so that the method is energy-saving, environment-friendly and pollution-free.

Description

technical field [0001] The invention belongs to the technical field of smelting and recycling of nonferrous aluminum, and in particular relates to a method and a device for processing carbon slag and recycling electrolyte. Background technique [0002] In the traditional aluminum electrolysis process, due to factors such as selective oxidation of the carbon anode and electrolyte erosion, some carbon particles always fall off from the anode and enter the electrolyte melt to form carbon slag. Carbon slag is in the electrolyte, which is harmful to the electrolytic production process, so it is usually fished out by the operator. Yet the charcoal residue that pulls out contains more than 60% fluoride electrolyte, belongs to hazardous waste (abbreviated as hazardous waste). If the electrolyte in the carbon slag cannot be effectively recovered and the carbon slag is directly discarded, it will not only lead to a large waste of electrolyte, but also seriously pollute the environmen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C3/18F27D17/00
CPCC25C3/18F27D17/001F27D17/004Y02P10/25
Inventor 包生重陈开斌张旭贵王珣曹韶峰刘彦辉李昌林汪艳芳
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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