Pelleting method of titanium diboride powder

A powder and granulation technology, applied in the field of aluminum electrolysis, can solve the problems of poor wettability, affecting the wettability of the surface of the cathode material and the aluminum liquid, and unable to achieve a wettable diversion cathode, achieving low cost, anti-electrolyte and other problems And the effect of strong sodium permeability and small deformation

Inactive Publication Date: 2010-09-29
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

From the perspective of particle size distribution, use cheap and easy-to-obtain large-grained carbon aggregates to replace TiB 2 particle size grading is feasible, but in TiB 2 -C The large-grained carbon aggregate on the surf

Method used

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  • Pelleting method of titanium diboride powder
  • Pelleting method of titanium diboride powder

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Experimental program
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Effect test

Embodiment 1

[0030] Granulation formula: aggregate 80% (of which TiB 2 powder: 85%, petroleum coke: 15%); coal tar pitch: 20%.

[0031] Weigh according to the above dosage, knead in a kneader, and after mixing, shape under 180MPa molding pressure. Bury the molded product with coke and roast it. At the beginning, the temperature is raised slowly (8-15°C / h) to 600°C, and then the temperature is relatively fast (15-25°C / h) to 900°C, and the temperature is kept for 6-15h. Rapid cooling (30-40°C / h) to 600°C, and then furnace cooling to room temperature. Use the jaw crusher to crush the roasted product and screen to obtain high-content TiB with different particle sizes 2 Particles (the choice of sieve depends on the required TiB 2 The particle size depends on the size of the particles. Generally, the sieve with the required particle size and the number of meshes at the same distance (as shown in Table 1) is generally selected. For example: TiB with a particle size of about 1000 μm is now req...

Embodiment 2

[0033] Granulation formula: aggregate 80% (of which TiB 2Powder: 100%, petroleum coke: 0%); coal tar pitch: 20%.

[0034] Weigh according to the above dosage, heat the asphalt to the molten state, then knead it with the aggregate, after mixing, shape it under 180MPa molding pressure. Bury the molded product with coke and roast it. At the beginning, the temperature is raised slowly (8-15°C / h) to 600°C, and then the temperature is relatively fast (15-25°C / h) to 900°C, and the temperature is kept for 6-15h. Rapid cooling (30-40°C / h) to 600°C, and then furnace cooling to room temperature. Use the jaw crusher to crush the roasted product and screen to obtain high-content TiB with different particle sizes 2 particles. The TiB 2 Particle bulk density is 2.23g / cm 3 , The porosity is 17.0%, the compressive strength is 35MPa, the resistivity is 25μΩ·m, it is completely wetted with molten aluminum, no cracks, good thermal shock resistance and long service life.

Embodiment 3

[0036] Granulation formula: aggregate 80% (of which TiB 2 powder: 85%, petroleum coke: 15%); coal tar pitch + epoxy resin: 20%.

[0037] Weigh the material according to the above dosage, dissolve the epoxy resin with acetone, then mix it with asphalt and aggregate, and mold it under 180MPa molding pressure after mixing. Bury the molded product with coke and roast it. At the beginning, the temperature is raised slowly (8-15°C / h) to 600°C, and then the temperature is relatively fast (15-25°C / h) to 900°C, and the temperature is kept for 6-15h. Rapid cooling (30-40°C / h) to 600°C, and then furnace cooling to room temperature. Use the jaw crusher to crush the roasted product and screen to obtain high-content TiB with different particle sizes 2 particles. The TiB 2 Particle bulk density is 2.18g / cm 3 , the porosity is 20.1%, the compressive strength is 30MPa, the resistivity is 28μΩ·m, it is completely wetted with molten aluminum, no cracks, good thermal shock resistance and lon...

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Abstract

The invention provides a pelleting method of titanium diboride powder, which is suitable for preparing high-content high-strength large TiB2 particles for the wettable cathode of an aluminium electrolysis cell and is especially suitable for preparing the high-content high-strength large TiB2 particles for the wettable cathode of a deflector-type aluminium electrolysis cell. The method is characterized in that the high-content high-strength TiB2 particles are prepared by carrying out processes of kneading, shaping, roasting, crushing, sieving and the like on the titanium diboride powder as the main aggregate by adopting an organic binder or inorganic binder or a compound binder of the organic binder or the inorganic binder. The method has simple preparation process, controllable granularity and convenient application. The TiB2 particles prepared by the invention has the TiB2 content of 70-95 percent, the strength of 30-60MPa, and the resistivity of 0.5-40 muomega.m, and moreover, the TiB2 particles have small deformation and strong high temperature melt penetration resistance, can be completely wetted with aluminium liquid, realizes aluminium electrolysis production energy saving, prolongs the service life of the cathode of the aluminium electrolysis cell and reduces the aluminium electrolysis production cost.

Description

technical field [0001] The invention relates to the technical field of aluminum electrolysis, and is particularly suitable for titanium diboride (TiB 2 ) granulation method of granules. technical background [0002] The Hall-Elutt aluminum smelting method has been the only method for industrial aluminum smelting worldwide since 1886, but its high power consumption, short service life of the cathode, and short service life of the electrolytic cell lead to aluminum production costs too high. Studies have shown that TiB 2 Wettable cathode technology is one of the key technologies to innovate the current high-temperature molten salt electrolysis method for aluminum production and achieve substantial energy savings. [0003] Currently, TiB 2 There are many application forms of wettable cathodes. In contrast, TiB 2 -C composite cathode material has the characteristics of high bonding strength, long life, easy to enlarge, etc., and has better performance. It is one of the wett...

Claims

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Application Information

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IPC IPC(8): C04B35/58C25C3/08
Inventor 赖延清吕晓军李劼胥建刘业翔
Owner CENT SOUTH UNIV
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