Preparation method of electrolytic aluminum steel jaw aluminum ash protection ring

A technology for steel claw aluminum ash and protection ring, which is applied in the field of preparation of electrolytic aluminum anode steel claw protection ring, can solve the problems of increased loss, high working environment temperature, large waste and loss, etc., and achieves reduction of alumina consumption and improvement of recovery. The effect of utilization rate and production cost reduction

Inactive Publication Date: 2017-07-28

西宁宏睿机电科技有限公司

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AI-Extracted Technical Summary

Problems solved by technology

For example, an aluminum electrolysis enterprise produces 500,000 tons of primary aluminum annually, but produces 5,000 tons of waste aluminum ash. Many companies dispose of aluminum ash by simply selling it out, which costs about 1,000 yuan per ton, and the annual recovery is only 5 million yuan. Waste and waste great loss

[0003] At the same time, the cast steel claws used in the large prebaking tank have a high working environment temperature, and the diameter of each cycle is reduced by about 2.32mm due to high-temperature oxidation. The scale is very serious, which leads to the following problems: The electricity increases;...

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Method used

B, the selected material is dry-mixed for 5-10 minutes through a kneader, then add the adhesive that accounts for 10% of the total weight of raw materials, then wet-mix through a kneader for 15-20 minutes, and finally put into a molding machine for vibration The raw aluminum ash protective ring is obtained by molding; the adhesive is a paper ash adhesive formed after corrugated paper is soaked in water and pulverized, and the adhesive has an excellent bonding effect on the aluminum ash crushed material;

B,...

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Abstract

The invention discloses a preparation method of an electrolytic aluminum steel jaw aluminum ash protection ring. The preparation method comprises the following steps: firstly, aluminum ash raw materials salvaged in casting of molten aluminum are cooled to reach a normal temperature, and are crushed by a ball mill; then, the selected materials are dryly mixed by a kneading machine, are added with a corrugated paper ash binding agent being 8-12% of the total weight of the raw materials, are wetly mixed by the kneading machine, and are put in a forming machine for vibration formation; and finally, a raw aluminum ash protection ring is roasted to 300+-10 DEG C, is heated by 30 minutes, and is cooled to the room temperature to obtain a finished aluminum ash protection ring. The waste aluminum ash is directly adopted as the raw materials, and is matched with the binding agent produced by corrugated papers to preferably solve the aluminum ash bonding problem to achieve the effect of changing wastes into wealth; and the preparation method can largely increase the recycling rate of the waste aluminum ash, largely reduces the enterprise production cost, is free of influence on an electrolyte system, prolongs the life of a steel jaw by 3 times, and also can reduce the aluminum oxide consumption by about 5 kg/tAL.

Technology Topic

Bonding problemsAluminium +6

Image

Examples

Experimental program(3)

Example Embodiment

[0023] Example 1

[0024] The preparation method of the electrolytic aluminum steel claw aluminum ash protective ring includes the following steps:

[0025] A. Cool the aluminum ash raw materials salvaged during the casting of molten aluminum to room temperature, then grind them with a ball mill, and select materials with a particle size ≤ 2mm for use;

[0026] B. Dry the selected materials through a kneader for 5-10 minutes, then add 8% of the total weight of the raw materials, and then wet-mix for 15-20 minutes through the kneader, and finally put them into the molding machine for vibration molding. Aluminum dust protection ring; the adhesive is a paper dust adhesive formed after corrugated paper is immersed in water and crushed;

[0027] C. Put the raw aluminum ash protection ring into the roasting furnace, and roast it to 300±10℃ according to the baking process, heat it for 30 minutes, and then cool to room temperature to obtain the finished aluminum ash protection ring;

[0028] Among them, the composition of the aluminum ash raw material in terms of mass fraction is as follows, corundum Al 2 O 3 65%, aluminum nitride AlN 20%, rock salt NaCl 5%, and sodium fluoride NaF 10%;

[0029] The composition of the prepared raw aluminum ash protection ring according to the mass fraction is as follows, corundum Al 2 O 3 45%, rock salt NaCl is 13%, bayerite Al(OH) 3 12%, spinel (Mg 0.4 Al 0.6 )Al 1.8 O 4 25%, fluorspar CaF 2 Is 5%.

[0030] The composition of the finished aluminum ash protection ring is as follows according to the mass fraction, corundum Al 2 O 3 54%, containing potassium rock salt Na 0.9 K 0.1 Cl is 5%, halogen sand NHCl 4 3%, fluorspar CaF 2 3%, quartz SiO 2 6%, NaMgF 3 It is 29%; the withstand voltage of the finished aluminum ash protection ring is 50-70kg, and the resistivity is the same as the electrolyte.

[0031] In step A, when the aluminum ash raw material is ground with a ball mill, its residual rate is less than 10%.

[0032] In step B, the pressure during vibration molding using the molding machine is 50-60 tons.

[0033] The adhesive is a paste paper ash adhesive with a moisture content of 30-65%, which is made by immersing corrugated paper in water and crushing, and the moisture content is 50%.

Example Embodiment

[0034] Embodiment 2, the preparation method of the electrolytic aluminum steel claw aluminum ash protective ring includes the following steps:

[0035] A. Cool the aluminum ash raw materials salvaged during the casting of molten aluminum to room temperature, then grind them with a ball mill, and select materials with a particle size ≤ 2mm for use;

[0036] B. Dry the selected materials through a kneader for 5-10 minutes, then add a binder that accounts for 10% of the total weight of the raw materials, and then wet-mix them for 15-20 minutes through the kneader, and finally put them in the molding machine for vibration molding. Aluminum ash protective ring; the adhesive is a paper ash adhesive formed after corrugated paper is immersed in water and crushed, and the adhesive has an excellent bonding effect on the aluminum ash crushed material;

[0037] C. Put the raw aluminum ash protection ring into the roasting furnace, and roast it to 300±10℃ according to the baking process, heat it for 30 minutes, and then cool to room temperature to obtain the finished aluminum ash protection ring;

[0038] Among them, the composition of the aluminum ash raw material in terms of mass fraction is as follows, corundum Al 2 O 3 68%, aluminum nitride AlN 17%, rock salt NaCl 4%, and sodium fluoride NaF 11%;

[0039] The composition of the prepared raw aluminum ash protection ring according to the mass fraction is as follows, corundum Al 2 O 3 48.5%, rock salt NaCl 10.9%, bayer Al(OH) 3 Is 9.9%, spinel (Mg 0.4 Al 0.6 )Al 1.8 O 4 26.7%, fluorspar CaF 2 Is 4%;

[0040] The composition of the finished aluminum ash protection ring is as follows according to the mass fraction, corundum Al 2 O 3 57%, containing potassium rock salt Na 0.9 K 0.1 Cl is 4%, halogen sand NHCl 4 2%, fluorspar CaF 2 2%, quartz SiO 2 8%, NaMgF 3 It is 27%; the withstand voltage of the finished aluminum ash protection ring is 50-70kg, and the resistivity is the same as that of the electrolyte.

Example Embodiment

[0041] Embodiment 3, the preparation method of the electrolytic aluminum steel claw aluminum ash protective ring includes the following steps:

[0042] A. Cool the aluminum ash raw materials salvaged during the casting of molten aluminum to room temperature, then grind them with a ball mill, and select materials with a particle size ≤ 2mm for use;

[0043] B. Dry the selected materials in a kneader for 5-10 minutes, then add 12% of the total weight of the raw materials, and then wet-mix for 15-20 minutes in the kneader, and finally put them into the molding machine to vibrate and form a raw material. Aluminum ash protective ring; the adhesive is a paper ash adhesive formed after corrugated paper is immersed in water and crushed, and the adhesive has an excellent bonding effect on the crushed aluminum ash;

[0044] C. Put the raw aluminum ash protection ring into the roasting furnace, and roast it to 300±10℃ according to the baking process, heat it for 30 minutes, and then cool to room temperature to obtain the finished aluminum ash protection ring;

[0045] Among them, the composition of the aluminum ash raw material in terms of mass fraction is as follows, corundum Al 2 O 3 74%, aluminum nitride AlN 14%, rock salt NaCl 3%, and sodium fluoride NaF 9%;

[0046] The composition of the prepared raw aluminum ash protection ring according to the mass fraction is as follows, corundum Al 2 O 3 51%, rock salt NaCl is 9%, bayerite Al(OH) 3 Is 8%, spinel (Mg 0.4 Al 0.6 )Al 1.8 O 4 Is 29%, fluorspar CaF 2 Is 3%;

[0047] The composition of the finished aluminum ash protection ring is as follows according to the mass fraction, corundum Al 2 O 3 60%, containing potassium rock salt Na 0.9 K 0.1 Cl is 3%, halogen sand NHCl 4 1%, fluorspar CaF 2 1%, quartz SiO 2 10%, NaMgF 3 It is 25%; the withstand voltage of the finished aluminum ash protection ring is 50-70kg, and the resistivity is the same as the electrolyte.

[0048] Effect

[0049] Table 1 Comparison table of reduction of steel claw diameter (mm)

[0050]

[0051] Table 1 lists the test results of 3 life cycles. It can be found that when the aluminum gray ring is used, the diameter of the steel claw is reduced by 0.75mm per cycle, while the unused one is 2.32mm. The service life of the steel claw can be up to three times that of the non-use protective ring, which will save the electrolysis enterprise several million yuan in maintenance cost of the steel claw every year.

[0052] Table 2 Comparison table of average iron content before and after using the guard ring (%)

[0053]

[0054]

[0055] It can be seen from Table 2 that the iron content decreased by 0.0198% after using the aluminum ash protective ring, and the iron content of one and three even increased, which fully proved the outstanding role of the protective ring in reducing the iron content.

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PUM

Property	Measurement	Unit
Pressure value	50.0 ~ 70.0	kg
tensile		MPa
Particle size		Pa
strength	10

Description & Claims & Application Information

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