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Method for preparing prebaked anodes

A pre-baked anode and solvent technology, which is applied in the preparation/purification of carbon, can solve the problems of increasing anode porosity, reducing the quality of pre-baked anode, and decreasing bulk density, reducing volatile matter, reducing the baking cycle time and dosage. reduced effect

Inactive Publication Date: 2013-04-10
HUNAN CHUANGYUAN NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, coal tar pitch emits more than 40% of volatile matter during roasting, which causes the porosity of the roasted anode to increase and the volume density to decrease, thereby reducing the quality of the prebaked anode

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Add 0.8t carbon powder into the impregnation tank and pour it into 10m 3 Water, water is used as a solvent, fully stirred to make a slurry, 8t of calcined petroleum coke is added to the dipping tank, soaked for 1 day, and after drying for 2 hours, the moisture content of the calcined petroleum coke is reduced to below 0.3%, and the drying process It is dried in a conveyor screw with an electric heating tube, the heating temperature is set at 150°, and the bulk density of calcined coke is 0.75g / cm 3 .

[0019] After impregnation and drying, the calcined coke is subjected to material selection, batching, kneading, molding, cooling, and roasting processes to obtain a prebaked anode. The material selection process includes secondary crushing and screening.

[0020] Quality index of prebaked anode:

[0021] Bulk density: 1.56g / cm 3 ;

[0022] Resistivity: 50μΩm;

[0023] Compressive strength: 45MPa.

Embodiment 2

[0025] Add 1.t of carbon powder into the dipping tank and pour it into 10m 3 Kerosene, kerosene as a solvent, fully stirred to make a slurry, 7t calcined petroleum coke was added to the dipping tank, dipped for 1 day, the bulk density of the calcined coke was measured to be 0.82g / cm 3 .

[0026] The calcined coke after impregnation treatment is then subjected to material selection, batching, kneading, molding, cooling, and roasting processes to obtain a prebaked anode.

[0027] Quality index of prebaked anode:

[0028] Bulk density: 1.6g / cm 3 ;

[0029] Resistivity: 48μΩm;

[0030] Compressive strength: 48MPa.

Embodiment 3

[0032] The calcined petroleum coke is crushed and sieved, and 4t of calcined petroleum coke of 6-12mm and 2t of calcined petroleum coke of 3-6mm are taken.

[0033] Add 1.3t of carbon powder into the impregnation tank and pour it into 10m 3 In the solvent oil, the solvent oil is used as a solvent, and the slurry is made after fully stirring, and the sieved calcined petroleum coke is sequentially added to the dipping tank according to the above ratio, and immersed for 3 days, and the calcined petroleum coke of 6-12mm Aggregate bulk density is 0.65g / cm 3 , The bulk density of calcined petroleum coke aggregates of 3-6mm is 0.70g / cm 3 .

[0034] The calcined coke after impregnation treatment is then subjected to batching, kneading, molding, cooling and roasting processes to obtain a prebaked anode.

[0035] Quality index of prebaked anode:

[0036] Bulk density: 1.62g / cm 3 ;

[0037] Resistivity: 46μΩm;

[0038] Compressive strength: 50MPa.

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Abstract

The invention discloses a method for preparing prebaked anodes. The method sequentially comprises the steps of material selection, material preparation, mixed kneading, forming, cooling and roasting, an impregnating process is added before the material preparation process, and the impregnating process comprises the following steps that carbon powder materials and solvents are mixed to be made into slurry materials, then, calcined petroleum coke is added into the slurry materials to be impregnated for 1 to 3 days, the quantity of the solvents and the carbon powder materials is metered by adding 8 to 15g of carbon powder materials into 100ml of solvents, and the weight of the calcined petroleum coke added into 100ml of solvents is not greater than 80g. The method for preparing anodes provided by the invention has the advantages that the porosity of the anodes can be reduced, and the volume density of the anodes is increased, so the quality of the anodes is improved.

Description

technical field [0001] The invention relates to the technical field of production of prebaked anodes for aluminum electrolysis, in particular to a method for preparing prebaked anodes. Background technique [0002] Calcined petroleum coke, the main raw material for the production of prebaked anodes, is a porous carbon material with a porosity of about 30%. The current prebaked anode production method is that the calcined coke is crushed, sieved and pulverized, and the granular material and powder of each particle size are mixed according to a certain ratio, and then a certain proportion of coal under heating is added. Bitumen is kneaded. Coal tar pitch is used as a binder and penetrating agent. When kneading, liquid coal tar pitch enters the pores of calcined coke through infiltration, so as to reduce porosity and increase bulk density. However, coal tar pitch emits more than 40% of volatile matter during roasting, which causes the porosity of the roasted anode to increase...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/02C25C3/12C01B32/05
Inventor 聂智良江林涛
Owner HUNAN CHUANGYUAN NEW MATERIALS