Process for smelting macrocrystalline green silicon carbide
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A green silicon carbide and process technology, which is applied in the field of large crystal green silicon carbide smelting process, can solve the problems of high smelting cost, unreasonable distribution, small green silicon carbide grains, etc., and achieves high content, reduced waste, and compact and firm structure. Effect
Active Publication Date: 2010-04-07
TONGHUA HONGXIN ABRASIVE
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The disadvantage is that the material distribution in the furnace is unreasonable, the smelting cost is high, and the obtained green silicon carbide grains are small (1-3mm)
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[0015] see figure 1 , 2 , the smelting process of large crystal green silicon carbide includes the following steps: the secondary roasting process is to measure the purchased quartz sand and petroleum coke that meet the quality requirements according to the formula of Si:C ratio of 1.48-1.54, and put them into the mixer for stirring to achieve homogenization. . The homogenized raw materials are transported into the bottom of the furnace (1 part of the material area) for primary roasting, the reaction zone in the middle of the furnace (3, 4, 5 parts of the material area) is loaded with the charge after the second roasting, and the external heat preservation (7, 8 parts of the material area) Zone) is filled with the material after primary roasting for secondary roasting. The installed furnace is energized for about 32-36 hours for smelting, and the power transmission power is 8000KVA. After cooling for 72 hours, it is released from the furnace, graded, crushed, weighed and ins...
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Abstract
The invention relates to silicon carbide smelting, in particular to a process for smelting macrocrystalline green silicon carbide, which comprises the following: a, a step of preparing raw materials of quartz sand and petroleum coke in a ratio of 1.48 to 1.54; b, a step of material mixing; c, a step of furnace charge, in which homogenized raw materials are delivered to a material area (1) at the bottom of a furnace, a burden material subjected to secondary roasting is filled in reaction areas (3, 4 and 5) in the middle of the furnace, and a burden material subjected to primary roasting is filled in the external heat preservation areas (7 and 8); d, a step of smelting, in which the charged furnace is electrified for smelting for 32 to 36 hours, the power of a transmission transformer is 8,000 KVA, and after cooling for 72 hours, the materials are discharged and graded. By adopting a smelting process of roasting for two times, the process reduces the waste of primarily roasted material, the specific consumption of the petroleum coke, the quartz sand and power, and saves energy. Meanwhile, as a long-time lower power transmission is adopted, the reaction of grains is more uniform and complete and the structure of the grains is more compact and firm; and compared with products in the prior art, the product has higher hardness, larger grain size, higher content and more desirable powder grain form.
Description
technical field [0001] The invention relates to a silicon carbide smelting process, that is, a large crystal green silicon carbide smelting process. Background technique [0002] In the prior art, silicon carbide includes black silicon carbide and green silicon carbide, among which green silicon carbide is made of quartz sand and petroleum coke as the main raw materials, and is smelted by resistance furnace at high temperature. Green silicon carbide grains are the main raw material for cutting micropowder in the production line, and its grain size directly affects the hardness and content of the micropowder. The green silicon carbide grains are processed into fine powder by crushing, chemical treatment and other processes, which are mainly used in engineering ceramics, metallurgy, chemical industry, electronics, aerospace, refractory materials and other industries, especially for high-temperature semiconductor materials and single crystal silicon (electronic chips) ) and po...
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