A material for artificial hearth of aluminum electrolytic cell and preparation of said artificial hearth

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. technical background [0002] 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 the labor ...

AI Technical Summary

Problems solved by technology

[0004] 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 cell, the bath temperature, and the aluminum electrolysis system do not match or the process conditions are unreasonably controlled, it is easy to form a deformed furnace.

(3) Since the self-generated furnace is easy to solidify and dissolve continuously during the electrolysis process, the material balance and energy balance in the tank are coupled with each other, which increases the difficulty of controlling the electrolytic cell

However, this method has high requirements on sintering temperature, sintering equipment, raw materials, etc., and after the material is corroded in the later stage of use, other impurities will be brought into the electrolyte, thus polluting the electrolyte

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