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Method for preparing prebaked anode through anode mud

A prebaked anode and anode slime technology, which is applied in the field of prebaked anode preparation, can solve the problems of reduced electrolysis current efficiency, high energy consumption of prebaked anodes, and short service life, so as to achieve improved electrolysis current efficiency, not easy to oxidize and fall off, The effect of long service life

Inactive Publication Date: 2016-06-22
CHANGZHOU LANXU CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention: the prebaked anode prepared at present has high energy consumption and needs to be replaced regularly, and the uneven oxidation and carbon particles falling off during use will cause carbon slag to accumulate in the electrolyte, resulting in a decrease in the efficiency of the electrolytic current. The disadvantage of short cycle is to provide a method for collecting anode slime, adding sulfuric acid for immersion, mixing and stirring to collect the sediment for later use, filtering to obtain the filtrate, adding citric acid to the filtrate, stirring and reacting, and centrifuging to obtain the turbid liquid, which is used for subsequent use. The precipitates are mixed, kneaded and pressed into green bodies, kept warm in a calcination furnace, then raised the temperature, immersed in water after calcination, cooled to room temperature, and air-dried to prepare a prebaked anode

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0016] First collect 3kg of anode slime, put it into the reaction container, and add sulfuric acid solution with a mass fraction of 30% to the reaction container at the same time, the amount added is 50% of the mass of the anode slime, soak for 30min, then mix and stir, and collect the reaction container while stirring The sediment at the bottom, when the upper suspension in the reaction vessel settles, stop collecting the sediment and stop stirring, filter to obtain the filtrate, and collect the sediment for later use; then put the above-mentioned filtrate into a glass cup, and pour Add citric acid in an amount of 8% of the mass of the filtrate, heat up to 60°C at a rate of 5°C / min, stir and react for 1 hour at a speed of 120r / min, then filter to obtain a turbid liquid; Stir the precipitate and the turbid liquid obtained above at 120r / min to make it fully mixed, and let it stand for 12 hours. After standing, put the mixture into a kneader for kneading, and then put it into the...

example 2

[0018] First collect 4kg of anode slime, put it into the reaction container, and add sulfuric acid solution with a mass fraction of 35% to the reaction container at the same time, the amount added is 60% of the mass of the anode slime, soak for 35min, then mix and stir, and collect the reaction container while stirring Bottom sediment, when the upper suspension in the reaction vessel is settled, stop collecting the sediment and stop stirring, filter to obtain the filtrate, and collect the precipitate for later use; then put the above-mentioned filtrate into a glass cup, and pour it into the Add citric acid in an amount of 9% of the mass of the filtrate, heat up to 65°C at a rate of 5°C / min, stir and react for 2 hours at a speed of 150r / min, then filter to obtain a turbid liquid; The precipitate and the turbid liquid obtained above are stirred at 120r / min to make them fully mixed evenly, and left to stand for 18 hours. After the standing is completed, put the mixture into a knea...

example 3

[0020] First collect 4kg of anode slime, put it into the reaction container, and add sulfuric acid solution with a mass fraction of 40% to the reaction container at the same time, the amount added is 70% of the mass of the anode slime, soak for 40min, then mix and stir, and collect the reaction container while stirring The sediment at the bottom, when the upper suspension in the reaction vessel settles, stop collecting the sediment and stop stirring, filter to obtain the filtrate, and collect the sediment for later use; then put the above-mentioned filtrate into a glass cup, and pour Add citric acid in an amount of 10% of the mass of the filtrate, heat up to 70°C at a rate of 5°C / min, stir and react for 2 hours at a speed of 180r / min, then filter to obtain a turbid liquid; The precipitate and the turbid liquid obtained above are stirred at 120r / min to make them fully mixed evenly, and left to stand for 24 hours. After the standing is completed, put the mixture into a kneader for ...

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Abstract

The invention discloses a method for preparing a prebaked anode by utilizing anode slime, and belongs to the technical field of prebaked anode preparation. The present invention collects anode slime, adds sulfuric acid for immersion, mixes and stirs to collect sediment for later use, and filters to obtain a filtrate, adds citric acid to the filtrate, stirs and reacts, obtains turbid liquid through filtration, mixes with the spare sediment, kneads and presses After the green body is formed, it is kept warm in a calciner, and then the temperature is raised, and after calcined, it is immersed in water to cool to room temperature, and air-dried to obtain a prebaked anode. The beneficial effects of the present invention are: the preparation steps of the present invention are simple, the energy consumption of the obtained product is more than 30.2% lower than that of other products, no need for regular replacement, and the service period is long; the material is not easy to oxidize and fall off during use, and the electrolytic current efficiency is increased by 22-25% %.

Description

technical field [0001] The invention relates to a method for preparing a prebaked anode by using anode slime, and belongs to the technical field of prebaked anode preparation. Background technique [0002] Prebaked anodes are made of petroleum coke and pitch coke as aggregates and coal tar pitch as binders, and are used as anode materials for prebaked aluminum electrolytic cells. This kind of carbon block has been roasted and has a stable geometric shape, so it is also called prebaked anode carbon block, and it is also called carbon anode for aluminum electrolysis. Aluminum electrolytic cells using prebaked anode carbon blocks as anodes are called prebaked anode electrolytic cells, referred to as prebaked cells, which is a modern large-scale aluminum electrolytic cell. [0003] The biggest defect of prebaked anode is that it is a consumable electrode, so it must be replaced periodically, which will inevitably bring many problems: one is that a large amount of high-quality c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C3/12
CPCC25C3/125
Inventor 汪巍盛海丰
Owner CHANGZHOU LANXU CHEM CO LTD
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