Production method and system of coal-series needle coke

Abstract

The invention relates to a production method of needle coke, in particular to a production method of coal-series needle coke and a method for producing the coal-series needle coke by obtaining purified asphalt from which quinoline insoluble (QI) is removed by a solvent treatment method and carbonizing the purified asphalt. The invention also relates to a system for implementing the production method of the coal-series needle coke. In the production method of the coal-series needle coke, a settling tank is taken as settling equipment; the mixture of coal tar asphalt and a solvent is continuously introduced into the inlet of the settling tank; and a settled light phase and a settled heavy phase are continuously discharged out of the settling equipment respectively. In the production system of the coal-series needle coke, a settling tank is taken as settling equipment. Technical problems such as an unclear interface between the light phase and the heavy phase, realization of continuous production by using a plurality of stirring kettles alternatively, light phase loss during intermittent operation and large solvent loss caused by solvent settling by using the stirring kettles in the prior art are solved.

Description

technical field [0001] The present invention relates to a production method of needle coke, in particular to a production method of coal-based needle coke, in particular to obtaining purified pitch after removal of quinoline insolubles (QI) through a solvent treatment method, and carbonizing the purified pitch to produce coal The needle coke method. The invention also relates to a system for realizing the production method of the coal-based needle coke. Background technique [0002] Needle coke is a high-quality carbon species vigorously developed in carbon materials in the 1970s, and it is also one of the most important carbon species. Needle coke is more suitable for electrodes due to its lower electrical resistance and thermal expansion coefficient. Graphite electrodes are divided into ordinary electrodes, high power electrodes (HP) and ultra high power electrodes (UHP). Needle coke is mainly used to produce high-power and ultra-high-power graphite electrodes for elect...

AI Technical Summary

Problems solved by technology

[0007] The method disclosed in the patent application with publication number CN1793287A is a solvent sedimentation method, using a stirred tank as a mixing and QI sedimentation equipment for raw materials and solvents, which causes the following problems: 1. The unclear interface between light and heavy two phases causes high QI content of purified asphalt ;2. In order to realize industrialized continuous operation, multiple stirred tanks must be switched and used. In this way, the investment in equipment is relatively large; When it is impossible to completely pump it out, it will cause the loss of the light phase to reduce the product yield, and the solvent loss will increase at the same time

The main disadvantages of this method are: 1. The yield of purified products is low, so the yield of needle coke is low; 2. The process is long, difficult to operate, and difficult to industrialize; 3. The product quality is poor

[0009] The main disadvantages of the carbonization process of the invention patent CN1793286 are 1. The heating procedure of carbonized raw materials is complicated, and it is difficult to implement precise control in industrial equipment. Difference

The disadvantage of this invention is that due to the carbonization of the raw material, temperature changes have to be used during carbonization, which makes the operation complicated and the equipment suffers a large thermal shock

Images