Combined technological method for producing needle coke from raw material mixture

Abstract

The invention discloses a combined technological method for producing needle coke from a raw material mixture. The method comprises steps as follows: coal tar is firstly subjected to supercritical extraction and separation, and a coal tar light component and a coal tar heavy component are obtained; the pretreated coal tar heavy component obtained after pretreatment of the coal tar heavy component,an oil needle coke raw material and an auxiliary agent are mixed to enter a boiling-bed reactor, after the reaction, a liquid product is subjected to fractional distillation, and a light component and a heavy component are obtained; the heavy component enters a coking device and is subjected to a coking reaction, and after separation, gas, coker gasoline, coker diesel, coker gas oil and needle coke are obtained. The refined raw material mixture obtained with the method has the advantages of low quinoline insoluble content, low S and N impurity content and the like, and the produced needle coke has the advantages of low coefficient of thermal expansion, low sulfur content, low ash content and the like.

Description

technical field [0001] The invention relates to a process for producing needle coke, in particular to a process for producing high-quality needle coke by using mixed raw materials. Background technique [0002] Needle coke is a coke with special properties produced during the thermal conversion of coal-based or oil-based raw materials. Needle coke is an important raw material in the carbon industry, which has the advantages of low thermal expansion coefficient and good graphitization performance. After being broken, the shape is needle-like, and it has obvious fibrous structure and high anisotropy under the microscope. Power electrode steelmaking can improve steelmaking efficiency, reduce power consumption, and reduce steelmaking costs, and has significant economic and social benefits. [0003] Needle coke can be divided into coal-based needle coke and petroleum-based needle coke according to the source of raw materials. Petroleum-based needle coke is made of thermal crack...

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is that in the prior art, the raw material of needle coke needs to undergo high-temperature heat treatment to obtain the polycondensation concentrate, and the high temperature of the polycondensation reaction will cause the polycondensation reaction of part of the β resin in the raw material to generate new quinoline insolubles. As a result, the prepared needle coke has the problems of low yield and large thermal expansion coefficient

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