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A kind of impregnating agent for dense anode carbon block and preparation method thereof

The technology of anode carbon block and impregnating agent is applied in the field of impregnating agent for encrypting anode carbon block and its preparation, and can solve the problems of high porosity, poor impregnation effect, conductivity and mechanical strength of encrypted anode carbon block, etc.

Active Publication Date: 2020-02-18
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the impregnation effect of the above-mentioned impregnating agent is poor, and the porosity of the dense anode carbon block prepared by using this impregnating agent is relatively high, and the electrical conductivity and mechanical strength need to be improved.

Method used

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  • A kind of impregnating agent for dense anode carbon block and preparation method thereof
  • A kind of impregnating agent for dense anode carbon block and preparation method thereof
  • A kind of impregnating agent for dense anode carbon block and preparation method thereof

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preparation example Construction

[0023] The invention provides a method for preparing an impregnating agent for an encrypted anode carbon block, comprising the following steps:

[0024] A) mixing coal tar pitch with a solvent at 80-135° C. to obtain a coal tar pitch solution; the solvent includes washing oil and kerosene;

[0025] B) the coal tar pitch solution is subjected to centrifugal separation, and the obtained supernatant liquid is subjected to vacuum distillation;

[0026] C) mixing the product after vacuum distillation with nano-carbon powder to obtain an impregnating agent for a dense anode carbon block.

[0027] In the invention, the coal tar pitch and the solvent are mixed at 80-135 DEG C to obtain the coal tar pitch solution.

[0028] The present invention has no special limitation on the source and type of the coal tar pitch, which can be generally commercially available. Such solvents include washing oils and kerosene. The present invention has no special limitation on the sources and types ...

Embodiment 1

[0061] Add 10 parts by weight of coal tar pitch and 18 parts by weight of solvent into a beaker, stir and mix at 80° C. for 30 minutes, and transfer the obtained coal tar pitch solution into a centrifuge test tube after the dissolution is complete. In the solvent, the mass ratio of washing oil and kerosene is 8:10. The centrifuge test tube is put into a centrifuge, the set speed is 2000r / min, the centrifugation time is 4min, the slag is separated, the material is discharged, the sample is taken out, the upper layer liquid of the sample is subjected to vacuum distillation, and the temperature of the vacuum distillation is The temperature is 160°C, the pressure of the vacuum distillation is 0.1 MPa, and the time of the vacuum distillation is 60 min. After the solvent is removed by vacuum distillation, the product is received and its QI value is measured. The product was mixed with 4 parts by weight of nano-carbon powder with an average particle diameter of 0.02 μm at 90° C. for ...

Embodiment 2

[0063] Add 10 parts by weight of coal tar pitch and 15 parts by weight of solvent into a beaker, stir and mix at 100° C. for 60 minutes, and transfer the obtained coal tar pitch solution into a centrifuge test tube after complete dissolution. In the solvent, the mass ratio of washing oil and kerosene is 8:10. Put the centrifuge test tube into the centrifuge, set the rotating speed to be 2100r / min, and the centrifugation time is 4min, separate the slag, discharge the material, take out the sample, carry out vacuum distillation on the upper layer liquid of the sample, and the temperature of the vacuum distillation The temperature is 170°C, the pressure of the vacuum distillation is 0.05MPa, and the time of the vacuum distillation is 40min. After the solvent is removed by vacuum distillation, the product is received and its QI value is measured. The product was mixed with 3 parts by weight of nano-carbon powder with an average particle diameter of 0.5 μm at 100° C. for 20 minutes...

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Abstract

The invention provides a preparation method of impregnant for a compacted anode carbon block. The preparation method comprises the following steps of 1, mixing coal pitch with solvent at the temperature of 80-135 DEG C, so that a coal pitch solution is obtained, wherein the solvent comprises wash oil and kerosene; 2, conducting centrifugal separation on the coal pitch solution, and conducting reduced pressure distillation on obtained supernatant liquid; and 3, mixing a product of the reduced pressure distillation with nanometer carbon powder, so that the impregnant for the compacted anode carbon block is obtained. The QI value of the prepared impregnant for the compacted anode carbon block is low, so that in the impregnation process, the impregnant can be excellent in flowability and permeability; the impregnation effect of the impregnant is enhanced; and after an impregnation roasting process is completed, the porosity of an anode is effectively lowered. Meanwhile, the obtained impregnant for the compacted anode carbon block is high in coking capacity value; reinforcing and filling of the anode carbon block are achieved; and electrical conductivity and mechanical strength achievedafter the anode carbon block is roasted are effectively improved.

Description

technical field [0001] The invention relates to the technical field of nonferrous metallurgy, in particular to an impregnating agent for encrypted anode carbon blocks and a preparation method thereof. Background technique [0002] Anode carbon block refers to a carbon block produced with petroleum coke and pitch coke as aggregate and coal tar pitch as binder, which is used as anode material for prebaked aluminum electrolytic cell. This kind of carbon block has a stable geometric shape after roasting, so it is also called prebaked anode carbon block, and it is also called carbon anode for aluminum electrolysis. [0003] The macrostructure of petroleum coke or pitch coke is honeycomb or fibrous, and there are many pores of different sizes and uneven distribution on the surface and inside. During the roasting process, coal tar pitch, the binder, will also form many pores of different sizes due to its own decomposition, polycondensation, and carbonization to form pitch coke. Th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25C3/12
CPCC25C3/125
Inventor 李贺松侯文渊徐倜波李茂程本军朱晓伟
Owner CENT SOUTH UNIV