Continuous sedimentation process for production of needle coke

Abstract

The invention relates to a continuous sedimentation process for production of needle coke. Under the continuous condition of in-out materials, the process carries out settling separation on an insoluble substance of quinoline to obtain a qualified light phase of the insoluble substance of the quinoline. The mixed ratio of an aliphatic solvent to an aromatic solvent is (0.6-1.2) to 1; the mixed ratio of a mixed solvent to soft coal-tar asphalt is (0.6-1.2) to 1; the mixed oil is pumped into settling separation equipment by a pump for the settling separation; light liquid slowly rises; and after the insoluble substance of the quinoline reaches the requirement, the light liquid is continuously discharged from the upper part and distilled to obtain refined asphalt. The continuous sedimentation process has the advantages that the prior intermittent sedimentation process is improved into the continuous sedimentation process, namely the in-out materials are processed under the continuous operating condition. The continuous operation can simplify operation, reduce equipment, the floor space and the blocking of the equipment, and is favorable for long-period operation of the process.

Description

technical field [0001] The invention relates to a settling process for a raw material pretreatment unit in needle coke production. Background technique [0002] Needle coke is a high-quality carbon material, named for its elongated needle-like structure after crushing. Needle coke has a metallic luster on the outside and a layered structure inside. It has good orientation, electrical conductivity, and thermal conductivity. Therefore, it is the main raw material for manufacturing ultra-high-power electrodes for steelmaking. Using ultra-high-power electrode steelmaking, the smelting time can be shortened by 2 / 3, and the power consumption can be reduced by 50%. [0003] Needle coke production consists of three units, namely raw material pretreatment unit, coking unit and calcination unit. [0004] Years of experimental research results show that: needle coke raw materials require high content of aromatics, low content of quinoline insolubles (<0.3%), and low heterocyclic c...

AI Technical Summary

Problems solved by technology

The main disadvantages of this process are: many equipments, large floor area, large investment, complex operation, and easy to cause blockage of equipment and pipelines, so that the process cannot run smoothly and cannot be operated for a long period of time.