CN110144602A - A kind of carbon slag in Aluminium electrolysis treatment process - Google Patents
A kind of carbon slag in Aluminium electrolysis treatment process Download PDFInfo
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- CN110144602A CN110144602A CN201910483531.3A CN201910483531A CN110144602A CN 110144602 A CN110144602 A CN 110144602A CN 201910483531 A CN201910483531 A CN 201910483531A CN 110144602 A CN110144602 A CN 110144602A
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- carbon slag
- carbon
- aluminium electrolysis
- collecting tank
- bed
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25C—PROCESSES FOR THE ELECTROLYTIC PRODUCTION, RECOVERY OR REFINING OF METALS; APPARATUS THEREFOR
- C25C3/00—Electrolytic production, recovery or refining of metals by electrolysis of melts
- C25C3/06—Electrolytic production, recovery or refining of metals by electrolysis of melts of aluminium
Abstract
The invention discloses a kind of carbon slag in Aluminium electrolysis treatment process, specifically: inclined burning bed is placed in reacting furnace, burns bed bottom and electrolyte collecting tank is set；First carbon slag in Aluminium electrolysis is crushed, after mixing and weigh with combustion adjuvant, uniformly dispersing is on burning bed；Then it is continually fed into high temperature air from burning bed orientation reacting furnace, makes the O in the simple substance carbon and combustion adjuvant and air in carbon slag in Aluminium electrolysis2Sufficiently reaction；The high-temperature flue gas generated in reaction process is passed through in heat exchanger, with after the normal temperature air heat exchange that is passed through in heat exchanger, is handled into aluminum electrolysis flue gas purification system, it is up to standard after discharge；The liquid electrolyte generated in reaction process flows into electrolyte collecting tank from inclined burning bed, releases from electrolyte collecting tank after reaching predetermined fluid level, and inject in solidification mold.Low energy consumption for present invention process, has reached the requirement of environmentally friendly production.
Description
Technical field
The invention belongs to electrolytic etching of metal secondary resource recovery technology field, specifically a kind of carbon slag in Aluminium electrolysis treatment process.
Background technique
During aluminum electrolysis, one ton of primary aluminum of every production about 10 ~ 15kg of output anodic carbon residue, the carbon slag is often taken as
Offal treatment.However, fluorination salt content accounts for about carbon slag gross weight in carbon slag since long-time is by the immersion and infiltration of electrolyte
60~70%.Therefore, carbon slag in Aluminium electrolysis is the secondary resource of high added value, one ton of anodic carbon residue of every output, be equivalent to discarding 600 ~
700 kg electrolyte, 300 ~ 400 kg carbon dusts and 30kg aluminium oxide.As electrolytic aluminium cost pressure is increasing, the recycling of carbon slag
Using being particularly important.
There are mainly two types of traditional carbon slag in Aluminium electrolysis processing modes, respectively wet process and pyrogenic process.By carbon slag ball milling to be processed
It is 0.001mm hereinafter, medicament, which is added, carries out flotation to partial size, the carbon powder particle that flotation obtains is utilized as fuel, obtained
Electrolyte granular be heated to 950 DEG C of meltings after drying, inject in mold after being cooled to room temperature and stack spare, this is wet process
Treatment process.Due to needing to carry out flotation, while the electrolyte particulate needs produced reheat melting, wet-treating side
Formula, which exists, to be taken up a large area, invests the defects of big, water consume energy consumption is high, while containing a large amount of fluorides in the water after flotation, easily
Secondary pollution is caused to environment.Traditional pyrogenic attack technique is the heat generated using fuel combustions such as combustion gas or coals, is passed through
Carbon slag is heated to 900 ~ 1000 DEG C by the mode of heat radiation, makes the O in the simple substance carbon and air in carbon slag2Reaction generates CO2, carbon
Electrolyte in slag is flowed into mold after melting and is recycled.The treatment process provides heat using combustion gas or coal burning for carbon slag
Amount, needs to consume a large amount of fuel, increases production cost, while sharply increase carbon emission；And due to using non-close space,
The toxic gases such as the HF under the condition of high temperature in carbon slag are difficult to recycle, and on the one hand cause atmosphere pollution, on the other hand cause
The loss of the useful components such as fluorine element.
Summary of the invention
It is above-mentioned existing for carbon slag in Aluminium electrolysis wet processing process and pyrogenic attack technique the purpose of the invention is to overcome
Defect provides a kind of carbon slag in Aluminium electrolysis treatment process that low energy consumption, environmentally friendly.
A kind of carbon slag in Aluminium electrolysis treatment process of the present invention, the processing mode directly reacted using high temperature air with carbon slag, tool
Body the following steps are included:
Step 1: placing inclined burning bed in reacting furnace, burns bed bottom and electrolyte collecting tank is arranged；
Step 2: carbon slag in Aluminium electrolysis is crushed, and after mixing and weigh with combustion adjuvant, uniformly dispersing is on burning bed；
Step 3: being continually fed into high temperature air from burning in bed orientation reacting furnace, makes the simple substance carbon in carbon slag in Aluminium electrolysis and helps
Fire the O in agent and air2Sufficiently reaction；
Step 4: the high-temperature flue gas generated in reaction process is passed through in heat exchanger, with the room temperature sky being passed through in heat exchanger
It after gas heat exchange, is handled into aluminum electrolysis flue gas purification system, is discharged after up to standard；
Step 5: the liquid electrolyte generated in reaction process flows into electrolyte collecting tank from inclined burning bed, works as liquid
Position is released from electrolyte collecting tank when reaching 3/4 or more of electrolyte collecting tank volume, and is injected in solidification mold.
As the preferred of technical solution of the present invention, in above-mentioned steps two, partial size≤10mm after carbon slag in Aluminium electrolysis crushes.
In step 3, high temperature air temperature >=750 DEG C.
In step 4, high-temperature flue-gas >=1100 DEG C, temperature≤350 DEG C after heat exchange；It is warm after normal temperature air heat exchange
>=750 DEG C of degree, is passed through in reacting furnace as high temperature air and is recycled.
The beneficial effects of the present invention are:
1, the burning bed that redox reaction occurs for high temperature air and carbon slag is used inclined design by the present invention, and in the case where burning bed
Side's setting electrolyte collecting tank, realizes the automatic collection of liquid electrolyte, avoids frequently being opened and closed fire door when discharge liquid electrolyte
Increase energy consumption；The heat in high-temperature flue gas is made full use of, realizes heat by way of high-temperature flue gas and normal temperature air heat exchange
Recycling, to reduce energy consumption.
2, high temperature air of the present invention is reacted in confined space with reacting for carbon slag, to avoid gases such as HF and can be had
Evil flue dust is discharged into atmosphere；The low-temperature flue gas that high-temperature flue gas and normal temperature air heat exchange obtain is sent to the gas cleaning of aluminium electrolysis shop
It is handled in system, realizes the recycling to useful components such as HF in flue gas, while effectively preventing pernicious gas
Discharge realizes the requirement of environmental protection production.
Detailed description of the invention
Fig. 1 is the process flow chart of carbon slag in Aluminium electrolysis treatment process of the present invention；
In figure: 1, burning bed；2, electrolyte collecting tank；3, heat exchanger；4, reacting furnace；5, aluminum electrolysis flue gas purification system.
Specific embodiment
The treatment process of carbon slag in Aluminium electrolysis of the present invention is described in detail with reference to the accompanying drawing.
As shown in Figure 1, placing inclined burning bed 1 in reacting furnace 4, burns 1 bottom of bed and electrolyte collecting tank 2 is set.
Carbon slag in Aluminium electrolysis is first crushed to partial size≤10mm, after being mixed with combustion adjuvant (such as carbon dust, mineral oil, Arrcostab), is uniformly dissipated
Cloth is on burning bed 1；From the high temperature air for being continually fed into temperature >=750 DEG C on bed 1 in direction reacting furnace 4 is burned, make aluminium electroloysis
The O in simple substance carbon and combustion adjuvant and air in carbon slag2Sufficiently reaction.The high temperature of temperature >=1100 DEG C generated in reaction process
Flue gas is passed through in heat exchanger 3, and temperature≤350 DEG C after the normal temperature air heat exchange that is passed through in heat exchanger 3, into aluminium electroloysis
It is handled in flue gas purification system 5, is discharged into air after up to standard；The heat generated in reaction process makes in carbon slag in Aluminium electrolysis
Electrolyte melts, and liquid electrolyte flows under the influence of gravity into the electrolyte collecting tank 2 for burning 1 lower end of bed, and liquid level reaches electricity
From releasing and being injected in solidification mold in electrolyte collecting tank 2 when solving 3/4 or more of 2 volume of matter collecting tank, normal temperature air is warm
Temperature >=750 DEG C after exchange, are passed through in reacting furnace as high temperature air and are recycled.
Claims (4)
1. a kind of carbon slag in Aluminium electrolysis treatment process, which is characterized in that the processing mode directly reacted using high temperature air with carbon slag,
Specifically includes the following steps:
Step 1: placing inclined burning bed (1) in reacting furnace (4), burns bed (1) bottom setting electrolyte collecting tank (2)；
Step 2: carbon slag in Aluminium electrolysis is crushed, and after mixing with combustion adjuvant, uniformly dispersing is on burning bed (1)；
Step 3: it is continually fed into high temperature air in direction reacting furnace (4) on bed (1) from burning, makes the simple substance in carbon slag in Aluminium electrolysis
O in carbon and combustion adjuvant and air2Sufficiently reaction；
Step 4: the high-temperature flue gas generated in reaction process is passed through in heat exchanger (3), and is passed through in heat exchanger (3)
It after normal temperature air heat exchange, is handled into aluminum electrolysis flue gas purification system (5), is discharged after up to standard；
Step 5: the liquid electrolyte generated in reaction process flows into electrolyte collecting tank (2) from inclined burning bed (1)
In, it is released from electrolyte collecting tank (2) when liquid level reaches 3/4 or more of electrolyte collecting tank (2) volume, and inject solidification
With in mold.
2. a kind of carbon slag in Aluminium electrolysis treatment process as described in claim 1, which is characterized in that in step 2, the aluminium electroloysis
Partial size≤10mm after carbon ground-slag is broken.
3. a kind of carbon slag in Aluminium electrolysis treatment process as described in claim 1, which is characterized in that in step 3, the high temperature is empty
Temperature degree >=750 DEG C.
4. a kind of carbon slag in Aluminium electrolysis treatment process as described in any one of claims 1-3, which is characterized in that in step 4, institute
State high-temperature flue-gas >=1100 DEG C, temperature≤350 DEG C after heat exchange；Temperature >=750 DEG C after normal temperature air heat exchange, as height
Warm air is passed through in reacting furnace and is recycled.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201910483531.3A CN110144602A (en) | 2019-06-04 | 2019-06-04 | A kind of carbon slag in Aluminium electrolysis treatment process |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910483531.3A CN110144602A (en) | 2019-06-04 | 2019-06-04 | A kind of carbon slag in Aluminium electrolysis treatment process |
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| CN110144602A true CN110144602A (en) | 2019-08-20 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113188127A (en) * | 2021-06-15 | 2021-07-30 | 沈阳铝镁设计研究院有限公司 | Carbon slag powder burning system of electrolytic cell |
| CN113481542A (en) * | 2021-06-28 | 2021-10-08 | 中国铝业股份有限公司 | Method and device for treating carbon slag and recycling electrolyte |
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| CN102011148A (en) * | 2010-12-02 | 2011-04-13 | 云南云铝涌鑫铝业有限公司 | Method for innocent treatment of aluminum electrolysis anode carbon residue and recovery of electrolyte |
| CN103013573A (en) * | 2011-09-21 | 2013-04-03 | 张�诚 | System for supplying high temperature air for fluidized bed coal gasification furnace |
| CN203144535U (en) * | 2013-03-26 | 2013-08-21 | 郑州经纬科技实业有限公司 | Heating method electrolyte recycling system for aluminum electrolysis carbon residue |
| CN103302079A (en) * | 2013-06-20 | 2013-09-18 | 郑州经纬科技实业有限公司 | Comprehensive treatment and utilization method of aluminum smelting fluorine-carbon hazardous solid wastes |
| CN103831285A (en) * | 2014-03-12 | 2014-06-04 | 郑州经纬科技实业有限公司 | Aluminum electrolyzed waste carbon residue innocent treatment system and method thereof |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102011148A (en) * | 2010-12-02 | 2011-04-13 | 云南云铝涌鑫铝业有限公司 | Method for innocent treatment of aluminum electrolysis anode carbon residue and recovery of electrolyte |
| CN103013573A (en) * | 2011-09-21 | 2013-04-03 | 张�诚 | System for supplying high temperature air for fluidized bed coal gasification furnace |
| CN203144535U (en) * | 2013-03-26 | 2013-08-21 | 郑州经纬科技实业有限公司 | Heating method electrolyte recycling system for aluminum electrolysis carbon residue |
| CN103302079A (en) * | 2013-06-20 | 2013-09-18 | 郑州经纬科技实业有限公司 | Comprehensive treatment and utilization method of aluminum smelting fluorine-carbon hazardous solid wastes |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113188127A (en) * | 2021-06-15 | 2021-07-30 | 沈阳铝镁设计研究院有限公司 | Carbon slag powder burning system of electrolytic cell |
| CN113481542A (en) * | 2021-06-28 | 2021-10-08 | 中国铝业股份有限公司 | Method and device for treating carbon slag and recycling electrolyte |
| CN113481542B (en) * | 2021-06-28 | 2022-08-05 | 中国铝业股份有限公司 | Method and device for treating carbon slag and recycling electrolyte |
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