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Low-silicon prebaked anode and preparation method thereof

A technology for pre-baked anode and anode, which is applied in the field of low-silicon pre-baked anode and its preparation, can solve problems such as deterioration of electrolytic cell operation, anode slag removal, and influence on the quality of molten aluminum.

Active Publication Date: 2019-07-02
SHANDONG NANSHAN ALUMINUM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The production process of electrolytic aluminum liquid needs to consume a large amount of carbon materials, especially the prebaked anode. Therefore, the quality of the prebaked anode will have a great impact on the quality of the aluminum liquid: on the one hand, the impurity content in the anode body itself will affect the quality of the aluminum liquid. On the other hand, if the physical and chemical indicators of the prebaked anode cannot meet the production requirements, it will cause slag and cracks in the anode, and in severe cases, it will lead to the deterioration of the operation of the electrolytic cell, thereby affecting the quality of the primary aluminum in the electrolytic cell. Serious impact

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  • Low-silicon prebaked anode and preparation method thereof
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preparation example Construction

[0030] The embodiment of the present invention also provides a method for preparing a low-silicon prebaked anode, which includes the following process:

[0031] S1 Ingredients: Prepare anode raw materials and fluorine-containing inorganic salts. In terms of mass percentage, the quality of fluorine-containing inorganic salts is 0.1% to 2% of the total amount of anode raw materials. The anode raw materials include 82% to 86% carbonaceous aggregate and 14% % ~ 18% binder.

[0032] In this embodiment, the fluorine-containing inorganic salt preferably includes sodium fluoroaluminate Na 3 AlF 6 , sodium fluorotitanate Na 2 TiF 6 , sodium fluoroborate NaBF 4 , lithium fluoroborate LiBF 4 , aluminum fluoride AlF 3 , sodium fluoride NaF, calcium fluoride CaF 2 , magnesium fluoride MgF 2 , lithium fluoride LiF 2 at least one of the

[0033] The carbonaceous aggregate includes calcined petroleum coke and residual poles with an ash content less than 0.5%. The mass of the residua...

Embodiment 1

[0054] Embodiment 1 provides a low-silicon prebaked anode, which is obtained by the following preparation steps:

[0055] Prepare raw materials: 100kg carbonaceous aggregate (consisting of 83kg calcined petroleum coke and +17kg ash with an ash content less than 0.5%), wherein the weight percentage of each particle size material in the calcined petroleum coke is: 8mm-5mm is 20% , 22% for 5mm to 2mm, 25% for 2mm to 0.074mm, 35% for less than 0.074mm); 19kg of binder (composed of coal tar pitch and phenolic resin); 0.952kg of aluminum fluoride (accounting for carbonaceous aggregate and 0.8% of the total amount of adhesive).

[0056] Add aluminum fluoride to the carbonaceous aggregate, mix for 25 minutes, and preheat to 180°C to obtain a dry mixture; knead the dry mixture at 175°C for 30 minutes while adding a binder to obtain a paste.

[0057] Put the paste in a molding machine to press and vibrate for molding, the vibration time is 100s, and the pressure is 1.6kg / cm 2 , the gr...

Embodiment 2

[0060] Embodiment 2 provides a low-silicon prebaked anode, which is obtained by the following preparation steps:

[0061] Prepare raw materials: 100kg carbonaceous aggregate (consisting of 84kg calcined petroleum coke and +16kg ash content less than 0.5% of the residual electrode, wherein the weight percentage of each particle size material in the calcined petroleum coke is: 8mm ~ 5mm is 20% , 22% for 5mm to 2mm, 25% for 2mm to 0.074mm, and 35% for less than 0.074mm); 19kg of binder (composed of coal tar pitch and epoxy resin); 1.19kg of sodium fluoroaluminate (accounting for carbonaceous bone 1% of the total amount of materials and adhesives).

[0062] Add sodium fluoroaluminate to the carbonaceous aggregate, mix for 25 minutes, and preheat to 165°C to obtain a dry mixture; knead the dry mixture at 180°C for 30 minutes while adding a binder to obtain a paste.

[0063] Put the paste in a molding machine to press and vibrate for molding, the vibration time is 110s, and the pre...

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Abstract

The invention discloses a low-silicon prebaked anode and a preparation method thereof, and relates to the technical field of aluminum electrolysis in nonferrous metal metallurgy. The low-silicon prebaked anode is prepared by adding fluorine-contained inorganic salt in anode raw materials; the adding quantity of the fluorine-contained inorganic salt is 0.1-2% of the total quantity of the anode raw materials; the anode raw materials include 82-86 mass% of carbon aggregate and 14-18 mass% of binding agent; and the low-silicon prebaked anode controls the silicon content in a lower range to satisfy the demand of electrolytic aluminum on high-quality anode. The preparation method comprises the following steps: the fluorine-contained inorganic salt is added in the carbon aggregate for full mixing and preheating; then, the binding agent is added in the mixing process for forming and roasting to prepare the low-silicon prebaked anode; and the preparation method can reduce the silicon content of the prepared prebaked anode to control in a range of 100-200 ppm.

Description

technical field [0001] The invention relates to the technical field of aluminum electrolysis in nonferrous metallurgy, and in particular to a low-silicon prebaked anode and a preparation method thereof. Background technique [0002] An important indicator of the production of electrolytic aluminum liquid is the quality of aluminum liquid. Higher purity aluminum liquid can make the formed product have good physical and chemical properties, but more impurities in aluminum liquid will inevitably affect the physical and chemical properties of the product, such as affecting the aluminum The fracture toughness of the alloy increases the defects such as shrinkage cavity and shrinkage porosity of the ingot, reduces the corrosion resistance of the aluminum alloy, causes the conductivity of the aluminum alloy to deteriorate, and reduces the reflectivity of white light. Therefore, the higher the purity of the electrolytic aluminum liquid, the higher its use value. higher. Silicon is t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25C3/12
CPCC25C3/125
Inventor 姜海涛汤昌廷周平禹玉江
Owner SHANDONG NANSHAN ALUMINUM