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A kind of aluminum electrolysis prebaked carbon anode roasting method

A prebaked carbon anode and aluminum electrolysis technology, which is applied in the field of aluminum electrolytic prebaked carbon anode roasting, can solve the problems that it is difficult to ensure follow-up curves and affect the quality of prebaked blocks, and achieve the effect of uniform structure and temperature field

Active Publication Date: 2020-01-17
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The actual consumption of energy in the roasting process mainly depends on the reasonable roasting curve and reasonable negative pressure control. If the roasting curve is too long, the energy consumed will be higher, and if the roasting curve is too short, it will affect the quality of the pre-baked block. Therefore Reasonably formulate the roasting curve; if the negative pressure is too large, the volatile matter in the carbon anode cannot be fully burned and will be exhausted through the smoke exhaust rack; Enter

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] When the aluminum electrolytic prebaked carbon anode is roasted, the total negative pressure of the exhaust rack is controlled to 1800 pa, so that the roasting heating rate is not greater than 12°C / h, and the temperature difference between the high temperature section (6p) and the low temperature section (4p) between different fire channels is -5°C -30°C, the temperature difference between the upper and lower sides of the same fire channel is 0°C, the combustion frame is set in the 3P stage during the roasting process, and the 3P combustion frame is ignited when it is half of the furnace moving cycle. The roasting energy consumption is reduced to 1.88GJ / t-C, and the qualified rate of carbon anode is increased by 2 percentage points.

Embodiment 2

[0020] When the aluminum electrolytic prebaked carbon anode is roasted, the total negative pressure of the smoke exhaust rack is controlled to 1900pa, so that the roasting heating rate is not greater than 12°C / h, and the temperature difference in the high temperature section (6p) of the high temperature zone between different fire channels is 5°C, and the temperature difference in the low temperature section (4p) 30°C, and the temperature difference between the upper and lower sides of the same fire path is 150°C. During the roasting process, a combustion frame is set at the 3P stage, and the 3P combustion frame is ignited when it is half of the furnace moving cycle. The roasting energy consumption is reduced to 1.86GJ / t-C, and the pass rate of carbon anode is increased by 0.8 percentage points.

Embodiment 3

[0022] When the aluminum electrolytic prebaked carbon anode is roasted, the total negative pressure of the exhaust rack is controlled to 2100pa, so that the roasting heating rate is not greater than 12°C / h, and the temperature difference between the high temperature section (6p) between different fire channels is -5°C, and the temperature difference at the low temperature section (4p) is - 30°C, the temperature difference between the upper and lower sides of the same fire channel is 0°C, set up the combustion frame at the 3P stage during the roasting process, and ignite the 3P combustion frame when it is half of the furnace moving cycle. The roasting energy consumption is reduced to 1.87GJ / t-C, and the pass rate of carbon anode is increased by 1 percentage point.

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Abstract

The invention relates to the improvement of an aluminum electrolysis pre-baking carbon anode baking method, in particular to an aluminum electrolysis pre-baking carbon anode baking method. The aluminum electrolysis pre-baking carbon anode baking method is characterized in that the total negative pressure of a smoke discharge frame is controlled to range from 1,800 pa to 2,400 pa in the baking process, volatile matter escaping in the green body baking process is effectively and sufficiently combusted, and therefore the temperature of 1P and 2P of a baking furnace is improved; a reasonable baking curve is formulated, so that the temperature increase rate is not larger than 12 DEG C / h, the temperature is kept not decreased in the volatile matter combustion temperature stage, the volatile matter escaping in the green body baking process is effectively and sufficiently combusted, an unified temperature curve is executed through an automatic control system, and flame path material box structures and temperature fields of the baking furnace are kept uniform; and a combustion frame is arranged in a 3P stage in the baking process, and the 3P combustion frame is ignited at the half time of the furnace shift period, so that heat is supplied to be used for combustion of the volatile matter. The actual consumption of baking energy consumption is reduced effectively, and the percent of pass of a pre-baking anode is increased effectively.

Description

technical field [0001] The invention relates to an aluminum electrolytic prebaked carbon anode roasting method, which relates to an improvement of an aluminum electrolytic prebaked carbon anode roasting method. Background technique [0002] Today, under the situation of serious excess aluminum production capacity at home and abroad and fluctuating and weak aluminum prices, the development and competition of the aluminum industry are mainly manifested in the competition of technology and cost. The necessary conditions; the large-scale, high-efficiency and intensification of the aluminum electrolysis industry has become the mainstream of the development of the modern aluminum industry. In this context, large-scale aluminum electrolytic cells put forward higher requirements for prebaked carbon anodes, which require carbon anodes to bear higher anode current densities, and should have good electrical conductivity, higher thermal shock resistance, and higher Good oxidation resis...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25C3/12
CPCC25C3/125
Inventor 陈开斌孙丽贞罗钟生杨宏杰
Owner GUIZHOU BRANCH CHINA ALUMINUM IND