CN101982407A - Method for increasing true density of calcined coke for prebaked anode for aluminum electrolysis - Google Patents
Method for increasing true density of calcined coke for prebaked anode for aluminum electrolysis Download PDFInfo
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- CN101982407A CN101982407A CN 201010272080 CN201010272080A CN101982407A CN 101982407 A CN101982407 A CN 101982407A CN 201010272080 CN201010272080 CN 201010272080 CN 201010272080 A CN201010272080 A CN 201010272080A CN 101982407 A CN101982407 A CN 101982407A
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Abstract
The invention relates to a method for increasing the true density of calcined coke for a prebaked anode for aluminum electrolysis. The method is characterized by comprising the following steps: quantitatively feeding petroleum coke from a storage bin of materials to be calcined into a rotary kiln by means of a weighing system; gradually heating the raw petroleum coke in the rotary kiln to 1300-1500 DEG C, calcining for 70-100 minutes to effectively dewater;thoroughly separating out volatile constituents, introducing the calcined coke into a cooling machine;and directly spraying water to cool the calcined coke in the cooling machine so as to obtain the calcined coke for a prebaked anode for aluminum electrolysis. The invention increases the calcining temperature to 1300-1500 DEG C, while the temperature in the traditional process is 1250 DEG C; the desulfurization rate is increased to 20% or so; the calcining zone is shortened, burning loss of the petroleum coke is reduced, the extraction yield is increased by 1.5%, and 4630 tons of petroleum coke can be saved every year; the preheating time of the petroleum coke in the kiln can be greatly prolonged, so that the volatile constituents can be separated out sufficiently; and the volume density, the compression strength, the thermal shock resistance and the conductibility of the prebaked anode can be obviously improved.
Description
Technical field
The present invention relates to the production technical field of used for aluminium electrolysis prebaked anode, particularly a kind of method that improves aluminium electrolysis prebaked anode with burnt true density after forging.
Background technology
Prebaked anode is the key factor that influences electrolysis energy consumption as " heart " material of electrolysis of aluminum, and its effect is exactly that electric current is imported electrolyzer and participates in electrochemical reaction.Carbon anode is installed in upper part of the electrolytic cell, powerful direct current imports electrolyzer by carbon anode, the aluminum oxide and the electrolyte block of the top covering and heat insulating of carbon anode, the middle part is surrounded by the electrolysis mass shell, the bottom is immersed in the fused fluoride salt ionogen, under the hot environment about 950 ℃, carbon anode bottom and aluminum oxide generation electrochemical reaction finally generate CO, CO
2Account for about 15% of whole Aluminium Electrolysis power consumption at the electric energy that consumes on the carbon anode; The quality of quality of prebaked anode not only influences a ton aluminium charcoal consumption, and, current efficiency, energy consumption, primary aluminum quality etc. all there are Different Effects.Hence one can see that, for electrolysis of aluminum provides energy-saving and environmental protection, efficient, fine prebaked anode, is the emphasis of current aluminium with the carbon industry technological innovation.
The prebaked anode manufacturing process as shown in Figure 1.Its production process has master operations such as calcining petroleum coke, coagulation moulding and roasting.Wherein calcining petroleum coke is as the first road production process, forge the main raw material (account for prebaked anode total mass 70%～85%) that back Jiao is prebaked anode, forge that the back is burnt to be entered stoving oven later on the moulding of eu-bitumen coagulation and add thermal bake-out, make pitch coking, intensity increases, conductivity strengthens, and uses for Aluminium Electrolysis.
In calcination process, calcination time deficiency, calcining temperature are not enough, and volatile fraction in petroleum coke is separated out insufficient, can cause and forge the burnt true density≤2.0g/cm in back
3The prebaked anode ultimate compression strength that causes subsequent handling to be produced is low, heat-shock resistance is poor, causing prebaked anode to fall slag easily when electrolysis is used comes off, not only can increase the charcoal consumption, bath voltage is raise, and power consumption increases, and the breeze fragment that is suspended in the ionogen will destroy the normal technical qualification of Aluminum Electrolysis Production, the serious harm Aluminum Electrolysis Production, even cause accident to stop groove.Therefore seek the method that the burnt true density in back is forged in a kind of raising,, seem particularly important to guarantee the green anode quality.
Summary of the invention
The purpose of this invention is to provide a kind of method that improves aluminium electrolysis prebaked anode with burnt true density after forging.
Technical scheme of the present invention is:
Refinery coke before forging in the feed bin, by Weighing system to the rotary kiln dosing, the raw petroleum coke that enters rotary kiln is heated to 1300～1500 ℃ gradually, calcination time 70～100 minutes, make that it removes moisture content effectively, volatile matter is thoroughly separated out, improve true density and physical strength, reduce resistivity.Back Jiao that forges that calcining is good enters cooler, in cooler stopping property preferably high temperature forge the burnt directly water spray in back cool off aluminium electrolysis prebaked anode with forging back Jiao.
True density depends primarily on calcining temperature, calcination time and the acting in conjunction of the two as forging one of burnt main quality index in back.The U.S. tall and erect rotary kiln (long 68 meters of kiln, 4.0 meters of internal diameters) that cooperates the U.S. to introduce, the residence time of material in kiln increases about 30 minutes, the preheating zone lengthening of material, the raising for true density provides time enough.Rotary kiln adopts Sweet natural gas to act as a fuel, and (lower heating value is 35 to calorific value, 950kJ/Nm
3) (lower heating value is 5300kJ/Nm than adopting coal gas
3) much higher, improve calcining temperature to 1300～1500 ℃, shorten calcining zone, reduce material scaling loss and peroxidation, under the two the acting in conjunction of calcining temperature, calcination time, volatile matter is constantly overflowed and the pyrolytic polycondensation reaction is taken place simultaneously, causes refinery coke structural rearrangement and volumetric shrinkage, makes to forge the burnt true density in back and bring up to 2.06g/cm
3More than.Forge the burnt quality index in back and see Table 1:
Table 1 is forged the burnt quality index in back
| Index name | Unit | Index | Remarks |
| Fixed carbon | ％ | ＞98.5 | |
| Fugitive constituent | ％ | ＜0.5 | |
| Ash content | ％ | ＜0.3 | |
| Sulphur content | ％ | ＜3.0 | |
| Moisture | ％ | ＜0.5 | |
| Powder resistivity | Ω·mm 2·m | ＜530 | |
| True density | g/cm 3 | ＜2.06 |
The present invention compares with original technology has following positively effect:
1, improve calcining temperature and reach 1300～1500 ℃, traditional technology is 1250 ℃.Desulfurization degree is brought up to about 20%.
2, shorten calcining zone, reduce the refinery coke scaling loss, improve casting yield 1.5%, can save 4630 tons of refinery cokes every year.
3, prolong the warm up time of refinery coke in kiln significantly, volatile matter is fully separated out.
4, the volume density of prebaked anode, ultimate compression strength, heat-shock resistance and conductivity are improved significantly.
Description of drawings
Fig. 1 is the green anode manufacturing process flow diagram.
Fig. 2 is a calcining process of petroleum cokes by using schema of the present invention.
Embodiment
The U.S. tall and erect rotary kiln that employing is introduced from the U.S., specification Φ 4.0 * 68m, long 68 meters of kiln body, 4.0 meters of internal diameters.The calcination system rigging up and debugging finishes, rotary kiln is warming up to requirement according to processing requirement baking kiln, refinery coke before forging in the feed bin, quantitatively feed intake to rotary kiln by Weighing system, the raw petroleum coke that enters rotary kiln is heated to 1500 ℃ (can at 1300～1500 ℃) gradually, rotary kiln adopts Sweet natural gas to act as a fuel, calcination time 70～100 minutes, back Jiao that forges that calcining is good enters cooler, in cooler, forge back burnt directly water spray cooling, get aluminium electrolysis prebaked anode after the cooling with forging back Jiao, through rubber conveyer, chapelet is sent into to forge in the feed bin of back and is stored, and its technology is seen Fig. 2.Jiao then returns production system again after underproof the forging.
This method has prolonged the warm up time of refinery coke in kiln, shortens calcining zone, makes refinery coke remove in moisture content, the refinery coke volatile matter effectively and thoroughly separates out, and adds that its structure further resets, and volume fully shrinks, and makes to forge the burnt true density in back and bring up to 2.06g/cm
3More than, thereby improve physical strength, reduce resistivity.
Claims (2)
1. one kind is improved the aluminium electrolysis prebaked anode method of forging the burnt true density in back, refinery coke before it is characterized in that forging in the feed bin, by Weighing system to the rotary kiln dosing, the raw petroleum coke that enters rotary kiln is heated to 1300～1500 ℃ gradually, calcination time 70～100 minutes makes it remove moisture content effectively, and volatile matter is thoroughly separated out, calcine good back Jiao that forges and enter cooler, the direct water spray cooling of back Jiao of forging in cooler promptly gets aluminium electrolysis prebaked anode with forging back Jiao.
2. raising aluminium electrolysis prebaked anode according to claim 1 is characterized in that with the method for forging the burnt true density in back rotary kiln adopts Sweet natural gas to act as a fuel.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201010272080 CN101982407A (en) | 2010-09-03 | 2010-09-03 | Method for increasing true density of calcined coke for prebaked anode for aluminum electrolysis |
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| CN 201010272080 CN101982407A (en) | 2010-09-03 | 2010-09-03 | Method for increasing true density of calcined coke for prebaked anode for aluminum electrolysis |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103031573A (en) * | 2011-09-30 | 2013-04-10 | 湖南创元新材料有限公司 | Method for preparing prebaked anode with high-sulfur coke |
| CN105460914A (en) * | 2014-09-10 | 2016-04-06 | 沈阳铝镁设计研究院有限公司 | Low-temperature calcining process for pot furnace |
| CN115386390A (en) * | 2022-06-22 | 2022-11-25 | 中南大学 | Petroleum coke calcining process |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101698948A (en) * | 2009-11-03 | 2010-04-28 | 中国铝业股份有限公司 | Method for manufacturing carbon anode with shot coke-containing petroleum coke |
| CN101746751A (en) * | 2009-12-18 | 2010-06-23 | 中国铝业股份有限公司 | Calcining method for preparing aluminum-electrolytic pre-baked carbon anode petroleum coke |
-
2010
- 2010-09-03 CN CN 201010272080 patent/CN101982407A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101698948A (en) * | 2009-11-03 | 2010-04-28 | 中国铝业股份有限公司 | Method for manufacturing carbon anode with shot coke-containing petroleum coke |
| CN101746751A (en) * | 2009-12-18 | 2010-06-23 | 中国铝业股份有限公司 | Calcining method for preparing aluminum-electrolytic pre-baked carbon anode petroleum coke |
Non-Patent Citations (2)
| Title |
|---|
| 《节能技术》 20090731 穆二军 新型炭素煅烧回转窑热工测试与分析 328-330，333 1-2 第27卷, 第4期 2 * |
| 《铝电解炭阳极技术(一)》 20020430 王平甫等 铝电解炭阳极技术(一) 冶金工业出版社 130-136 1-2 , 第1版 1 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103031573A (en) * | 2011-09-30 | 2013-04-10 | 湖南创元新材料有限公司 | Method for preparing prebaked anode with high-sulfur coke |
| CN103031573B (en) * | 2011-09-30 | 2016-01-20 | 湖南创元新材料有限公司 | A kind of Behavior of High-sulfur Petroleum Coke prepares the method for prebaked anode |
| CN105460914A (en) * | 2014-09-10 | 2016-04-06 | 沈阳铝镁设计研究院有限公司 | Low-temperature calcining process for pot furnace |
| CN105460914B (en) * | 2014-09-10 | 2017-11-07 | 沈阳铝镁设计研究院有限公司 | A kind of pot type burner cryogenic calcining process |
| CN115386390A (en) * | 2022-06-22 | 2022-11-25 | 中南大学 | Petroleum coke calcining process |
| CN115386390B (en) * | 2022-06-22 | 2024-01-16 | 中南大学 | Petroleum coke calcining process |
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Application publication date: 20110302 |