Technology for producing coal-series needle coke by taking middle-temperature and low-temperature coal tar asphalt as raw material

Abstract

The invention relates to a technology for producing coal-series needle coke by taking middle-temperature and low-temperature coal tar asphalt as a raw material. The technology mainly comprises the following steps: carrying out decompression and distillation, and extraction and removal on middle-temperature and low-temperature coal tar; combining hydrogenation treatment, thermal polymerization andcalcining technologies under the action of a non-metal homogeneous mild-hydrogenation catalyst to prepare the coal-series needle coke with good performance and relatively high yield. The non-metal homogeneous mild-hydrogenation catalyst is mainly prepared from the following raw materials in percentage by mass: 55 weight percent to 79 weight percent of semi-coke, 20 weight percent to 40 weight percent of coke and 1 weight percent to 5 weight percent of graphene. According to the technology provided by the invention, after the raw material is subjected to combined pre-treatment, a refined asphalt raw material is reasonable in constitution and has a few of impurities; the catalyst has excellent modification performance and does not need to be separated subsequently; the graphene component also can be used for promoting a middle phase in a thermal polymerization process to form a wide-area and ordered fibrous structure and a high-performance needle coke product is easy to form.

Description

technical field [0001] The invention belongs to the technical field of mild hydrogenation catalysts, and in particular relates to a process for producing coal-based needle coke using medium-low temperature coal tar as a raw material. Background technique [0002] Needle coke is a vigorously developed carbon material. It has excellent properties such as low thermal expansion coefficient, low impurity content, good graphitization performance, good electrical conductivity, high heat resistance and mechanical strength, and excellent oxidation resistance. Needle coke The material can also greatly reduce the smelting time and energy consumption of electric furnace steelmaking. Compared with ordinary electrode steelmaking, it can shorten the smelting time of electric furnace steelmaking by 50%-70%, reduce power consumption by 20%-50%, and increase production capacity by 1.3 times. Widely used in national defense and metallurgical industries, it is the raw material for the productio...

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Problems solved by technology

[0005] The above-mentioned raw material pretreatment process has a certain effect on the removal of QI and component adjustment, but there are also some shortcomings: (1) The fraction optimization and component optimization of the raw material for the preparation of asphalt from needle coke have not been optimized, and the yield of needle coke is low. The burden and difficulty of pretreatment are large; (2) the QI content of refined pitch can only be removed to 0.1wt%, which affects the performance and quality of the final needle coke product; (3) the catalysts used in the current hydrogenation process are all metal solid catalysts, and the cost is high , the equipment investment is large, and there is troublesome separation of oil agent when using the kettle reaction; (4) The product quality of needle coke needs to be improved, and the preparation is suitable for ultra-high power electrode materials

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