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Zhengnai Industry co., LTD

RP|HP|SHP|UHP|Graphite Electrode Suplier

+86 19903830057zhengnaishiye@gmail.com

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General introduction of graphite electrode

Release time:2019-11-04 From: Zhengnai Industry in China

Product preheating temperature and warm-up time

The preheating temperature and preheating time of the product have certain influence on the impregnation quality and the impregnation production cost. The insufficient preheating temperature will affect the penetration of the asphalt into the pores of the roasting product. It is known that the optimal preheating temperature (heating medium temperature in the furnace) is 350 °C ± 30 ° C. The calcined electrode is preheated in a steel basket, and the product in the middle of the basket is not as hot as the product at the edge of the basket. Therefore, the product to be installed in the middle of the basket must reach a temperature required by the process, and a longer warm-up time must be passed.
 

 

Vacuum degree and vacuum exhaust time

The purpose of vacuum exhaust is to discharge the gas in the pores of the product opening to facilitate the penetration of the impregnant. The degree of vacuum and the length of the vacuum exhaust time mean the amount of gas discharged, and will directly affect the impregnation weight gain.
 

Preheating temperature of the impregnating agent and heating temperature of the impregnation tank

The preheating temperature and the heating temperature should ensure that the fluidity of the impregnating agent is in a good state, the viscosity is relatively low, and it is easy to penetrate into the pores of the product, but the temperature is too high and not good. Generally, the medium temperature asphalt having a softening point of 60~75 ° C is heated. When it reaches about 180 °C, the viscosity change is already small, and the light components have begun to decompose and volatilize. The preheating temperature of the impregnating agent is maintained at 160~180 ° C, and the immersion temperature is maintained at the same temperature range.

 

Pressure and pressurization time during impregnation

The impregnating agent is immersed in the pores of the product mainly by capillary action and osmosis. The capillary action is affected by the pore pore size and the interaction force between the solid and liquid interfaces, while the osmosis is affected by the permeability coefficient and the viscosity of the impregnant, and with the pressure and pressure. Pressure time related.
 

Impregnation cycle

The impregnation operation is a periodic operation, and a complete operation process including preheating of the roasting product, canning, vacuuming, pressurizing, cooling, and discharging the product is called an impregnation cycle. The production of high-density carbon and graphite products requires several impregnation operations to achieve the desired density, that is, several impregnation cycles.
 
The impregnation operation is a periodic operation, and a complete operation process including preheating of the roasting product, canning, vacuuming, pressurizing, cooling, and discharging the product is called an impregnation cycle. 
 

Graphite electrodes are important conductive materials

Graphite electrode is an important conductive material in electric steelmaking or other electric metallurgy industry. With the development of electric steelmaking and other electric metallurgical industries, graphite electrode production has become one of the indispensable sectors in the national economy.

Index of UHP Grapgite electrode

Item Unit UHP
300-600mm 650-800mm
Electric resistivity Electrode μΩm 4.8-5.8 4.6-5.8
Nipple 3.8-4.5 3.8-4.5
Flexural strength Electrode Mpa 10.0-14.0 10.0-14.0
Nipple 20.0-26.0 22.0-26.0
Elastic modulus Electrode Gpa 9.0-13.0 10.0-14.0
Nipple 15.0-18.0 15.0-18.0
Bulk density Electrode ≥g/cm3 1.68-1.74 1.70-1.74
Nipple 1.77-1.82 1.78-1.84
CTE(100-600℃) Electrode x10-6/℃ 1.1-1.4 1.1-1.4
Nipple 0.9-1.2 0.9-1.2
Ash   0.3 0.3
 

GRAPHITE ELECTRODE

Our company’s graphite electrode production capacity
At the beginning of the 21st century, our annual capacity of graphite electrode has reached about 100,00 t. Due to the rapid development of the technology of electric steelmaking industry, the high power electric furnace, ultra-high power electric furnace and dc electric furnace are becoming more and more popular.
 

HP or UHP graphite electrodes are widely used

Our factory has basically eliminated small and medium-sized electric furnace, my company’s production of steel mills currently use a lot of diameter 550-700mm of high power or ultra high power graphite electrode more, dc furnace is also designed by high power or ultra high power.
 

Producing large-scale graphite electrodes is our company ‘s task .

Since the 1990s, China has more than 20 electric furnaces with high and ultra-high power . Therefore, the demand for large specification high power or ultra high power graphite electrode is increasing. Mass production of large specification high power or ultra high power graphite electrode has become an important task of our company.

 

China’s carbon plant equipment level has improved

In recent ten years, the production of graphite electrodes in China has undergone many changes, and the production capacity has been increasing rapidly. In 2005, our company actually produced various kinds of graphite electrodes, among which the output of high power and ultra-high power graphite electrodes accounted for 20%. In order to meet the needs of developing varieties, improving production efficiency and saving energy, our company has increased investment in technological transformation and accelerated the progress of technological transformation. Some new equipment has been introduced.
 

Laying the foundation for the Company

Our company also began to produce needle coke in 1995 after efforts to solve the problem of raw materials needed for the production of high and ultra-high power graphite electrodes. A great deal of research work has been done on the production of high and ultra-high power graphite electrode by several universities, scientific research institutes and factory research institutes , and fruitful results have been achieved, laying a technical foundation for the further development of graphite electrode industry.

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