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Inorganic modified coal pitch and preparation method thereof

A technology of inorganic modification and coal tar pitch, applied in building components, building insulation materials, construction and other directions, can solve the problem of not fully satisfying the production of high-quality carbon electrode materials for aluminum, and achieve low cost, improved coking value, and increased volume. The effect of density

Inactive Publication Date: 2012-04-25
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

With the development of industrial technology, the traditional coal tar pitch represented by medium-temperature coal tar pitch and high-temperature coal tar pitch cannot fully meet the requirements for the production of high-quality carbon electrode materials for aluminum.

Method used

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  • Inorganic modified coal pitch and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Raw material formula: coal tar pitch (particle size: ≤150μm): 90%, AlF 3 Powder (particle size: 10-150 μm): 10%.

[0032] Weighing according to the above formula, coal tar pitch and AlF 3 Mix the powder evenly, put the mixture into the reactor, heat up to 150°C at a rate of 5°C / min, control the pressure inside the reactor: 5.0MPa, stir speed: 150r / min, and modify for 6.0h.

[0033] The coking value of the prepared modified coal tar pitch is 57%, the content of TI is 28%, the content of QI is 8%, and the content of β resin is 20%. The modified coal tar pitch was used to prepare carbon anode for aluminum electrolysis. Compared with the original coal pitch based carbon anode, the volume density of the modified coal tar pitch based carbon anode increased by 3.5%, and the compressive strength increased by 6.8%. , the flexural strength increased by 4.6%, the oxidation resistance of the prepared carbon anode was significantly improved, and the carbon slag in the electrolyte ...

Embodiment 2

[0035] Raw material formula: coal tar pitch (particle size: ≤150μm): 90%, TiB 2 Powder (particle size: 10-150 μm): 10%.

[0036] Weighing according to the above formula, the coal tar pitch and TiB 2 Mix the powder evenly, put the mixture into the reactor, heat up to 200°C at a rate of 5°C / min, control the pressure inside the reactor: 1.0MPa, stir speed: 150r / min, and modify for 6.0h.

[0037] The coking value of the prepared modified coal tar pitch is 58%, the content of TI is 30%, the content of QI is 8.3%, and the content of β resin is 21.7%. The modified coal tar pitch was used to prepare carbon cathode for aluminum electrolysis. Compared with the original coal pitch based carbon cathode, the volume density of the modified coal pitch based carbon cathode increased by 5.5%, and the compressive strength increased by 8.2%. , the corrosion resistance and electrolytic expansion resistance of the prepared carbon cathode are significantly improved, and the electrolytic expansion...

Embodiment 3

[0039] Raw material formula: coal tar pitch (particle size: ≤150μm): 95%, Al 2 o 3 Sol (50-100nm): 5%.

[0040] Weighing according to the above formula, coal tar pitch and Al 2 o 3 The sol was mixed evenly, and the mixture was put into the reactor, and the temperature was raised to 300°C at a rate of 5°C / min. The pressure inside the reactor was controlled at 0.1MPa, the stirring speed was 150r / min, and the modification was performed for 3.0h.

[0041] The coking value of the prepared modified coal tar pitch is 56%, the content of TI is 29%, the content of QI is 8.5%, and the content of β resin is 20.5%. Using this modified coal tar pitch for aluminum electrolysis with TiB 2 / C composite cathode, with pristine coal tar pitch-based TiB 2 / C composite cathode, the bulk density of the modified coal tar pitch-based composite cathode increased by 4.8%, and the compressive strength increased by 7.6%, and the prepared TiB 2 / C composite cathode has significantly improved corrosion...

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Abstract

The invention discloses an inorganic modified coal pitch and a preparation method thereof. The preparation method of the inorganic modified coal pitch comprises the following steps of: 1, mixing: mixing 80-95 percent by mass of original coal pitch and 5-20 percent by mass of inorganic particles; and 2, modified heat treatment: putting the mixture obtained in the step 1 to a reaction vessel, heating the reaction vessel to the modified temperature of 150-300 DEG C, stirring and modifying for 1.0-6.0h to obtain the inorganic modified coal pitch. The TI, QI and Beta resin contents and the coking value of the inorganic modified coal pitch are all remarkably improved. The volume density, the compression strength, the bending strength, the oxidation resistance and the electrolysis expansiveness resistance performance of a carbon electrode for aluminium electrolysis and a TiB2 / C composite cathode material, which are prepared from the inorganic modified coal pitch, are remarkably improved.

Description

technical field [0001] The invention belongs to the technical field of aluminum electrolysis electrode materials, iron and steel industry electrode materials and other carbon materials, and relates to an inorganic modified coal tar pitch and a preparation method thereof. technical background [0002] Coal tar pitch has the advantages of rich resources, low price, good fluidity, and easy graphitization, and is widely used as a carbon material product such as artificial graphite electrodes for industrial steelmaking, carbon anodes for aluminum, carbon cathodes, and carbon / carbon composite materials. binder. In the production process, the coal tar pitch binder is melted and mixed with the aggregate, and then the carbon material is made into a carbon material through molding-roasting or graphitization. The binder coal tar pitch used as a carbon material should have good cohesiveness, and at the same time, it should have a high coking value and compactness after carbonization, s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L95/00C08K3/38C08K3/24C08K3/34C08K3/22
Inventor 吕晓军李劼胥建赖延清田忠良张红亮
Owner CENT SOUTH UNIV
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