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Material for artificial hearth of aluminum electrolysis bath and preparation of artificial hearth

An aluminum electrolytic cell, artificial technology, applied in the field of refractory materials, can solve the problems of electrolyte pollution, deformed furnace, increase the control difficulty of electrolytic cell, etc., and achieve the effect of avoiding performance and avoiding bottom sinking.

Inactive Publication Date: 2017-06-27
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] This kind of self-generation process of the traditional aluminum electrolytic cell furnace mainly has the following disadvantages: (1) The whole electrolytic cell is in an abnormal period during the formation process of the self-generated furnace, which generally takes about 3 months
During this period, due to the high cell temperature, high cell voltage and high molecular ratio of the electrolyzer, the current efficiency was low, which greatly increased the energy consumption of the electrolyzer.
(2) The traditional aluminum electrolytic cell relies on the self-growth of the furnace in the abnormal period. Once the thermal insulation structure design of the aluminum electrolytic

Method used

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  • Material for artificial hearth of aluminum electrolysis bath and preparation of artificial hearth
  • Material for artificial hearth of aluminum electrolysis bath and preparation of artificial hearth
  • Material for artificial hearth of aluminum electrolysis bath and preparation of artificial hearth

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0086] Step (1): 300g of the host material (NaF: 50g, LiF: 30g, NaF: 3 AlF 6 : 200g, Li 3 AlF 6 : 20g) and 75g additive A (BaF 2 : 20g, CaF 2 : 40g, MgF 2 : 15g) ground to -200 mesh accounted for 75% and mixed evenly;

[0087] Step (2): Heat the homogeneously mixed material in step (1) to 900°C and keep it warm for 90 minutes to completely melt it;

[0088] Step (3): 62g additive B (Al 2 o 3 Powder: 51g, AlF 3 : 11g) ground with 63g additive C (MgO fiber: 11g, Al 2 o 3 Fiber: 52g) mix evenly, fill in the mould;

[0089]Step (4): placing the mold filled in step (3) at 450°C for heat preservation;

[0090] Step (5): pour the mixed melt obtained in step (2) into the mold filled with additive B and additive C in step (4), and keep stirring to make it mix with the material in the mold until it becomes viscous, and then Then rapidly cool to room temperature within 20 minutes.

[0091] The density of this material is 2.42g / cm 3 , The material withstands a maximum tempe...

Embodiment 2

[0101] Step (1): 288g host material (NaF: 72g, LiF: 18g, NaF: 3 AlF 6 : 162g, Li 3 AlF 6 : 36g) and 65g additive A (BaF 2 : 26g, CaF 2 : 22g, MgF 2 : 17g) ground to -200 mesh accounted for 80% and mixed evenly;

[0102] Step (2): Heat the homogeneously mixed material in step (1) to 1000°C, keep it warm for 50 minutes to completely melt it;

[0103] Step (3): 75g additive B (Al 2 o 3 Powder: 50g, AlF 3 : 25g) ground with 72g additive C (MgO fiber: 24g, Al 2 o 3 Fiber: 48g) mix evenly, fill in the mould;

[0104] Step (4): placing the mold filled in step (3) at 500°C for heat preservation;

[0105] Step (5): pour the mixed melt obtained in step (2) into the mold filled with additive B and additive C in step (4), and keep stirring to make it mix with the material in the mold until it becomes viscous, and then Then rapidly cool to room temperature within 20 minutes.

[0106] The density of this material is 2.56g / cm 3 , withstand the highest temperature of 1050 ° C, ...

Embodiment 3

[0132] Step (1): 350g of the host material (NaF: 53g, LiF: 35g, NaF: 3 AlF 6 : 240g, Li 3 AlF 6 : 22g) and 50g additive A (BaF 2 : 12g, CaF 2 : 27g, MgF 2 : 11g) ground to -200 mesh accounted for 90% and mixed evenly;

[0133] Step (2): Heat the homogeneously mixed material in step (1) to 1100°C and keep it warm for 30 minutes to completely melt it;

[0134] Step (3): 50g additive B (Al 2 o 3 Powder: 37.5g, AlF 3 : 12.5g) ground with 50g additive C (MgO fiber: 12.5g, Al 2 o 3 Fiber: 37.5g) mixed evenly, filled in the mould;

[0135] Step (4): placing the mold filled in step (3) at 550°C for heat preservation;

[0136] Step (5): pour the mixed melt obtained in step (2) into the mold filled with additive B and additive C in step (4), and keep stirring to make it mix with the material in the mold until it becomes viscous, and then Then rapidly cool to room temperature within 20 minutes.

[0137] The density of this material is 2.33g / cm 3 , withstand the highest tempe...

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Abstract

The invention discloses a material for an artificial hearth of an aluminum electrolysis bath. The material comprises the following components: 50-75 parts of a host material, 5-20 parts of an additive A, 10-20 parts of an additive B and 10-20 parts of an additive C, wherein the host material comprises one or more alkali-containing metal fluorides and Na3AlF6; the additive A comprises at least one of BaF2, CaF2 and MgF2; the additive B comprises Al2O3 and/or AlF3; and the additive C comprises at least one of a Mg oxide fiber and an Al oxide fiber. The invention further discloses a method for preparing the artificial hearth of the aluminum electrolysis bath by adopting the above material. Through the coordination among the above parts by weight of the host material, the additive A, the additive B, and the additive C in the fiber form, the density, the liquidus temperature and the strength of the material for the artificial hearth of the aluminum electrolysis bath can be improved.

Description

technical field [0001] The invention belongs to the field of refractory materials, and in particular relates to a material for an artificial hearth of an aluminum electrolytic cell, and a method for preparing an artificial hearth of an aluminum electrolytic cell by using the material. [0002] technical background [0003] The furnace of the Hall-Elut aluminum electrolytic cell is an important part of the electrolytic cell and the basis of the entire electrolysis process. The quality of the electrolyzer furnace is an important indicator to measure the quality of an electrolyzer. A good inner shape of the furnace can ensure the stable operation of the electrolysis, can effectively protect the artificial legs and side carbon blocks from damage, reduce the occurrence of sick cells, and can effectively reduce power consumption; a bad furnace can make the electrolytic cell The deterioration of the operating condition will reduce the electrolytic current efficiency and increase th...

Claims

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Application Information

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IPC IPC(8): C25C3/08
CPCC25C3/08
Inventor 赖延清田忠良杨凯张志剑杨超辛鑫赵泽军郭伟昌张凯李劼
Owner CENT SOUTH UNIV
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