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Preheating starting method for vertical electrode aluminum electrolytic cell

A technology for preheating and starting an aluminum electrolytic cell, applied in the field of aluminum smelting, can solve problems such as unsuitability, achieve balanced distribution of cell voltage and current, and achieve the effect of non-disturbance start-up

Active Publication Date: 2019-07-23
浙江睿曦绿业新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, for the vertical structure inert anode aluminum electrolytic cell whose cathode is fixed in the furnace, since the cathode is "upright" inside the furnace, it is not suitable to directly adopt the above method

Method used

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  • Preheating starting method for vertical electrode aluminum electrolytic cell
  • Preheating starting method for vertical electrode aluminum electrolytic cell
  • Preheating starting method for vertical electrode aluminum electrolytic cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] In this implementation, the structure of the electrolytic cell and the preheating roasting device is as follows: figure 1 shown.

[0042] The electrolytic cell is a 40kA inert anode aluminum electrolytic cell, figure 1 Shown as 1 / 4 slot. Each group of cathodes is 150cm long and 30cm high, and is composed of six small cathodes arranged side by side to form a wettable cathode-2. Each group of preheating roasting tubes is composed of a burner-4 and a burner nozzle-7, and the burner-4 and a cathode protection cover-8 are assembled in combination. Each cathodic protection shield has a negative lead-out bus bar-5 and a positive lead-out bus bar-6. The burner one 4, the burner nozzle one 7, and the cathode shield one 8 are all made of heat-resistant stainless steel (310s). There are several slits-9 on each group of cathodic protection covers, which are set for adjusting the resistance of the cathodic protection covers.

[0043] Each set of preheating and roasting tubes ha...

Embodiment 2

[0051] In this implementation, the structure of the electrolytic cell and the preheating roasting device is as follows: figure 2 shown.

[0052] The electrolytic cell is a 40kA inert anode aluminum electrolytic cell, figure 2 Shown as 1 / 4 slot. Each group of cathodes is 150cm long and 30cm high, and is composed of several small cathodes arranged side by side to form wettable cathodes 211. Each group of preheating roasting tubes is assembled by three burners two 13 and three burner nozzles two 17, three burners and the cathode protection cover two 16 that can protect three groups of cathodes. On the cathodic protection cover 2 16, there is a positive pole lead-out bus bar 2 15 and two negative pole lead-out bus bars 2 14. Burner 2 13, burner nozzle 2 17, and cathode shield 2 16 are all made of heat-resistant stainless steel (310s).

[0053] Each set of preheating and roasting tubes has its own heat-insulating and sealed cover, which can keep the electrolytic cell warm and...

Embodiment 3

[0062] In this implementation, the structure of the electrolytic cell and the preheating roasting device is as follows: image 3 shown.

[0063] The electrolytic cell is a 40kA inert anode aluminum electrolytic cell, image 3 Shown as 1 / 4 slot. Each group of cathodes is 150cm long and 30cm high, and is composed of six small cathodes arranged side by side to form wettable cathodes 319. Each set of preheating roasting tubes has only one cathode protection cover 324 without a burner. Each cathode protection cover has a negative lead-out bus bar 3 21 and a positive lead-out bus bar 3 22 . The cathode protection cover 3 24 is made of heat-resistant stainless steel (310s). There are several slits 3 23 on each group of cathodic protection covers, which are set for adjusting the resistance of the cathodic protection covers.

[0064] Each set of preheating and roasting tubes has its own heat-insulating and sealed cover, which can keep the electrolytic cell warm and sealed during t...

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Abstract

The invention belongs to the field of aluminum smelting, and discloses a preheating starting method for a vertical electrode aluminum electrolytic cell. The method comprises the following steps that (1) a plurality of sets of preheating calcining tubes are uniformly arranged in a furnace hearth at first, the preheating roasting tubes are provided with a burner and a burner nozzle, and a cathode protective cover is connected with the burner, protects a cathode and has the function of energization heating; (2) gas and air are introduced to the burner, thus, the burner can emit flame or high-temperature flue gas for preheating the roasting electrolytic cell, after the temperature in the electrolytic cell furnace hearth reaches a target temperature, gas and air supply is stopped, and the burner stops operating; (3) the cathode protective cover is energized, and the temperature of the electrolytic cell furnace hearth is maintained through the heating power of the cathode protective cover; and (4) a liquid electrolyte is poured in, the burner and the cathode protective cover are pulled out step by step, an inert anode is replaced, and the cathodic protection cover in the electrolytic cell is still heated, so that the temperature of a electrolyte melt is maintained until the cathode protective cover is completely pulled out and the inert anode is replaced.

Description

technical field [0001] The invention belongs to the field of aluminum smelting and relates to a method for preheating and starting a vertical electrode aluminum electrolytic cell. Background technique [0002] At present, inert anode aluminum electrolysis technology is moving towards industrialization. The structure of the inert anode aluminum electrolytic cell is relatively flexible, and it can be arranged horizontally or vertically like the prebaked carbon anode aluminum electrolytic cell. The inert anode aluminum electrolytic cell with vertical electrode arrangement can reduce the volume of the electrolytic cell, increase the production rate, reduce heat dissipation, and make up for the disadvantage that the theoretical decomposition voltage of the inert anode is higher than that of the carbon anode because the electrode area can be doubled. In addition, increasing the electrode area can also allow the electrode to operate at a relatively low current density to reduce th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C3/06
CPCC25C3/06
Inventor 杨建红
Owner 浙江睿曦绿业新材料科技有限公司
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