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Zhengnai Industry co., LTD


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Pseudosegregation phenomenonin graphite electrode process Asphalt segregation is a phenomenon produced by coal, bitumen and capillary action in the green body under the action of temperature, gravity and capillary action. Causes of segregat

Single chamber furnace in graphite electrode production A single chamber furnace consists of a fuel combustion chamber, a roasting chamber, a volatile combustion chamber, a chimney, and the like. Comparison of energy consumption The energy

Advantages of secondary impregnation of impregnated graphite electrode 1. Improve the yield of the graphitization process. 2. Reduce the power consumption of the graphitization process. 3. A large reduction in the decomposition gas of the a

Metallurgical coke is broken and used as roasting filler After the metallurgical coke is broken, it is used as a roasting filler. Although the coke powder has poor thermal conductivity and high adsorption, it is not easy to be cleaned on th

7 advantages of the car bottom roaster in graphite electrode 1. During the roasting process, the flue gas in the furnace is always in the circulating convection state by the high temperature fan at the top of the furnace. Therefore, the tem

The downdraft kiln is produced separately for each kiln in graphite electrode The downdraft kiln is produced separately for each kiln, which requires 288-480h for one roasting cycle including furnace charging, heating, cooling, unloading an

The disadvantages of the old ring furnace in graphite electrode The disadvantage of the old ring furnace is that the temperature difference between the upper and lower chambers is large, which seriously affects the uniformity of the quality

There are 6 kinds of roasters used. The roasters used are: ring roaster, tunnel kiln, downdraft kiln, underfloor roaster, rotary bed roaster, single chamber furnace, etc. There are 2 kinds of ring roasters. The ring roaster is divided into

The existence of temperature difference during roasting The temperature difference is not only expressed at the end of the calcination temperature rise, but also in the whole process of calcination. The faster the temperature rise rate, the

5 stages in the roasting process of graphite electrode 1. The coal pitch is in a molten state, and the green body begins to soften. 2. The volatile phase is discharged in a large amount, 3. Asphalt begins to undergo strong polycondensation

There are 2 reasons why the length is not up to standard. Reasons for the length of the substandard: 1. The length of the green body is incorrectly measured. 2. The control valve and the cutter operating mechanism are malfunctioning, so the

Green defect type Green defects are defects in the appearance of the green body or internal non-compliance with technical standards. The green defects are generally observed with the naked eye. If necessary, the surface of the green body is

Compression ratio definition in graphite electrode The compression ratio is the ratio of the cross-sectional area of the chamber of the extruder to the cross-sectional area of the extruded product during extrusion. Small tonnage extruder ca

Upper surface contact specific pressure selection The upper surface contact specific pressure also has an effect on increasing the green density and shortening the vibration time.When standing upright, the green contact pressure of the larg

Reasons for green cooling in graphite electrode The green body just leaving the extrusion nozzle maintains a high temperature, cuts to the required length, and is immersed in cold water to prevent the green body from being deformed. Vibrati

Assembly of the extruder in graphite electrode 1. The main residence plug and the main residence plug hydraulic cylinder, 2. The material chamber; 3. The extrusion nozzle that can be replaced as needed, 4. The secondary plunger and the seco

Factors that determine the fluidity of the paste The flow characteristics of the paste during extrusion depend on the type of paste, the temperature of the extrusion process, the shape of the nozzle and the surface finish, and the extrusion

Mechanical properties of carbon paste in graphite electrode The change in mechanical properties over time is called mechanical relaxation, including stress relaxation, creep and dynamic mechanical properties. Stress relaxation definition St