Method for preparing large-scale high-power carbon electrodes using semi-graphitized anthracite

Abstract

The invention relates to a method for preparing a large-scale high-power carbon electrode by using semi-graphitized anthracite, the semi-graphitized anthracite, graphite scrap and modified coal tar pitch are adopted as raw materials. The graphite scrap is grinded into powder material, the semi-graphitized anthracite is processed into a particle material, the powder material and particle material are prepared in accordance with formulation dosage into a dry material and fed into a kneading pot to be heated and stirred, then molten modified coal tar pitch is added, stirred into paste material and fed into a material airing equipment to be subjected to cooling, temperature equalizing and smoke exhausting treatment, the mold barrel is internally evacuated, pressurized and vibrated to form green bodies, the green bodies are roasted by adopting a special roasting curve after cooled and machined in accordance with the requirements of users after naturally cooled. By adopting the preparation method provided by the invention, varieties of production raw materials are reduced, production formula is simplified, various main performance indexes of the product are improved, the qualified rate is greater than 90%, the demands of large ore-smelting electric furnaces for the large high-power electrode are met, and the production cost per ton is reduced by 400-500 Yuan in comparison with a traditional formula product.

Description

technical field [0001] The invention belongs to the technical field of carbon electrode manufacturing technology, in particular to a method for preparing large-scale high-power carbon electrodes by using semi-graphitized anthracite. Background technique [0002] Carbon electrodes are mainly used in submerged arc furnaces for the production of industrial silicon, yellow phosphorus or corundum. Since the production of such products requires high electrode quality, the performance indicators of raw materials used for carbon electrodes are also very high. There are many raw materials that can be used to produce carbon electrodes, such as anthracite, petroleum coke, crushed graphite, natural graphite, etc. Generally, the production of carbon electrodes is based on electric calcined anthracite, petroleum coke, graphite powder, coal tar pitch or dust collection, etc. as raw materials through crushing, screening, grinding, batching, kneading, molding, roasting, machining and other p...

AI Technical Summary

Problems solved by technology

Generally, the production of carbon electrodes is based on electric calcined anthracite, petroleum coke, graphite powder, coal tar pitch or dust collection, etc. as raw materials through crushing, screening, grinding, batching, kneading, molding, roasting, machining and other processes. The main disadvantages are as follows: (1) Due to the wide variety of raw materials and complex formula ratios, the production process is not easy to control, the internal structure of the product is uneven, and the yield of finished products does not exceed 85%; (2) Large-scale high-power carbon electrodes are mainly made of calcined Petroleum coke is used as raw material, and the production cost is high; (3) The product mainly has the following one or several disadvantages, namely, high ash content, high resistivity, poor mechanical strength, poor thermal shock resistance, poor oxidation resistance, and technical performance indicators cannot meet the requirements of use. Require

However, this method has too many ingredients, the production process is complex and difficult to control, the cost of raw materials is high, and other metals or trace elements are brought into the product and the product is easily oxidized.

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