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ghpφ960~φ1420mm ultra-large graphite electrode and its production method
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A technology of graphite electrodes and super-large specifications, which is applied in the field of high-quality super-large graphite electrodes
Active Publication Date: 2021-01-15
河南昇瑞炭材料科技有限公司 +2
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[0007] Second, the largest ultra-high power graphite electrode used in domestic electric arc furnace steelmaking is Restricted by the level of raw materials, equipment and technology, in the field of large-scale graphite electrode production, breaking through a specification is a great progress
In the past, due to the limitation of raw materials and equipment level, large-scale carbon enterprises did not devote themselves to the development of super-large specifications. High-quality graphite electrodes are produced, and submerged arc furnace designers have no choice but to choose low-grade vibration-formed carbon electrodes and ordinary graphite electrodes that are simple and easy to form to support submerged arc furnace smelting
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Embodiment 1
[0137] Embodiment 1: a kind of Large-scale graphite electrodes are extruded from needle coke raw materials and are hollow The hollow electrode;
[0138] The particle size and formulation requirements of the needle coke raw material are:
[0139] The maximum particle size is 20-30mm, the dosage is 10%, and the purity is above 85%;
[0140] The particle size is 12-20mm, the dosage is 10%, and the purity is above 85%;
[0141] Other particle sizes are 8-12mm, 4-8mm, 2-4mm, 0-2mm. The dosage range of these four particle sizes is evenly distributed, each 9%, and each particle size requires a purity of 85% or more;
[0142] The purity requirement of 0.071 powder is 50-55%, and the dosage is 44%.
[0143] the above The production method of large-scale graphite electrode, its specific steps are as follows:
[0144] A. Pressing process:
[0145] Add the needle coke raw materials that meet the requirements into the dry material heating pot and heat them with 300°C hot kerosene...
Embodiment 2
[0170] Embodiment 2: a kind of Large-scale graphite electrodes are extruded from needle coke raw materials and are hollow The hollow electrode;
[0171] The particle size and formulation requirements of the needle coke raw material are:
[0172] The maximum particle size is 20-30mm, the dosage is 8%, and the purity is above 85%;
[0173] The particle size is 12-20mm, the dosage is 8%, and the purity is above 85%;
[0174] The other particle sizes are 8-12mm, 4-8mm, 2-4mm, 0-2mm. The dosage range of these four particle sizes is evenly distributed, each 10%, and the purity of each particle size is required to be more than 85%;
[0175] The purity requirement of 0.071 powder is 50-55%, and the dosage is 44%.
[0176] the above The production method of large-scale graphite electrode, its specific steps are as follows:
[0177] A. Pressing process:
[0178] Add the needle coke raw materials that meet the requirements into the dry material heating pot and heat them with 30...
Embodiment 3
[0203] Embodiment 3: a kind of Ultra-large graphite electrodes are extruded from needle coke raw materials and are hollow hollow electrodes.
[0204] The particle size requirement of the needle coke raw material is:
[0205] The maximum particle size is 20-30mm, the dosage is 12%, and the purity is above 85%;
[0206] The particle size is 12-20mm, the dosage is 10%, and the purity is above 85%;
[0207] The other particle sizes are 8-12mm, 4-8mm, 2-4mm, 0-2mm, the dosage range of these four particle sizes is evenly distributed, each is 8%, and the purity of each particle size is required to be more than 85%;
[0208] The purity requirement of 0.071 powder is 50-55%, and the dosage is 46%.
[0209] the above The production method of large-scale graphite electrode, its specific steps are as follows:
[0210] A. Pressing process:
[0211] Add the needle coke raw materials that meet the requirements into the dry material heating pot and heat them with 300°C hot kerosene ...
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Abstract
The invention discloses a GHP ultra-large-specification graphite electrode with [phi] of 960-1420 mm. A needle coke raw material is adopted for extrusion forming. The electrode is a hollow electrode with hollow [phi] of 150-300 mm. A production method of the hollow electrode comprises the following steps: an extrusion forming step, a water-cooling drilling step ([phi]150-[phi]300mm), a primary roasting step, an end face flattening and hole filler cleaning step, an impregnation step, a secondary roasting step, an LWG internal string graphitization step and a machining step in sequence. The high-quality needle coke raw material is adopted so that the electrode has high conductivity, high thermal conductivity and low thermal expansion performance, and the produced super-large-specification graphite electrode can bear the smelting working current larger than 20 A / cm<2> to be efficiently smelted; the high-quality super-large-specification graphite electrode is produced by using the extrusion forming method, the performance indexes of high conductivity, high homogeneity, high density, high strength, high thermal stress resistance and the like are achieved, and subversive technical breakthroughs can be generated in the aspects of energy conservation, emission reduction and efficient and rapid smelting when the graphite electrode is applied to a high-capacity submerged arc furnace.
Description
Technical field: [0001] The invention relates to a production method of a high-quality graphite electrode applied to a large-capacity submerged arc furnace, in particular to a high-quality graphite electrode extruded using needle coke raw materials. Ultra-large-scale graphite electrodes and methods for producing the same. Background technique: [0002] At present, the level of smelting technology in the domestic submerged arc furnace industry is seriously homogenized. The domestic large-scale calcium carbide and ferroalloy submerged arc furnaces are still produced using the self-baking electrode technology of carbon primary products imported from abroad in the 1980s; The vibration-formed carbon electrode with a diameter greater than 1200mm and the vibration-formed low-grade graphite electrode are developed. This situation and development trend obviously do not meet the requirements of the "Made in China 2025" national strategy for the technological upgrading of basic ind...
Claims
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Application Information
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