Method for smelting silicon carbide by using sealed environment-friendly silicon carbide smelting furnace

Abstract

The invention provides a method for smelting silicon carbide by using a sealed environment-friendly silicon carbide smelting furnace, silicon carbide smelting is performed in the sealed environment-friendly silicon carbide smelting furnace, and the smelting process comprises the following steps: firstly, preparing and mixing reaction raw materials: preparing and uniformly mixing a siliceous raw material and a carbonaceous raw material according to a ratio of (1.17-1.19): 1; charging: charging the prepared and mixed reaction raw materials into a furnace; and finally, smelting: electrifying and smelting the loaded furnace for 32-36 hours, wherein in the electrifying process, the power of the power transmission transformer in the first 85%-95% time period is rated power, the power of the power transmission transformer in the last 5%-15% time period is 2 / 3 of the rated power, cooling for 3 days after smelting is completed, discharging from the furnace, and grading to obtain silicon carbide. The method is applied to the sealed silicon carbide smelting furnace, the particle size of the lower furnace charge is thickened, the particle size of the carbonaceous raw material is 1-3 mm, the particle size of the siliceous raw material is 3-10 mm, the material gap is increased, the air permeability of the furnace charge is effectively improved, the heat in the furnace and the conveying of the siliceous furnace charge are improved, and the first-grade product rate of products is increased.

Description

Technical field [0001] The present invention belongs to the technical field of smelting silicon carbide, silicon carbide, to a refining method, in particular a sealed environment using a silicon carbide type silicon carbide smelting furnace smelting methods. Background technique [0002] Silicon carbide by the conventional smelting furnace bottom, end walls, side walls of three parts, the bottom of which is a ground plane; the end wall is secured to the bottom of the electrification of the electrodes is mounted gauge member; furnace capacity based on different side the walls are movable body blocks dozen to several tens blocks, furnace smelting furnace sidewall means sequentially assembled to the smelting furnace hearth, as the charge retaining member, after completion of the smelting furnace smelting furnace and disassembled spacer as charge assembly of the baffles on the other furnace smelting furnace, so recycling. Thus, when loading the furnace side wall is assembled, after c...

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Problems solved by technology

In this way, the side wall is assembled when the furnace is installed. After the smelting is completed, the side wall is removed in order to facilitate the operation of the furnace. However, during the disassembly process of the side wall, the high-temperature charge suddenly rushes out of the furnace. On the other hand, during the smelting process, due to the difficulty of sealing the gaps between the side walls and between the side walls and the bottom of the furnace, it is difficult to control the flue gas and kiln exhaust gas on the furnace surface

[0003] In order to respond to the requirements of national environmental protection work and improve the working environment of employees, the side wall is poured into an integral structure, so that the side wall, furnace bottom, and end wall become an integral structure, and the original movable side wall is changed to a fixed side wall of integral concrete. In this way, the smelting furnace is a "U"-shaped box without a cover. The sealing performance of the smelting furnace with fixed side walls is greatly improved. On the one hand, it is beneficial to the collection and treatment of the exhaust gas of the smelting furnace. The side wall was dismantled, and the dust, tail gas and dust were completely controlled, making the working environment clean and orderly, meeting the production needs, and received good results. However, while the environmental protection work of the smelting furnace was improved, new problems also appeared, "U Compared with the traditional furnace type, the smelting furnace with a cross-section has poor air permeability, especially the lower part of the smelting furnace.

The formation of silicon carbide is carried out at high temperature, and convection is the main form of heat transfer in the furnace, and poor air permeability is not conducive to convective heat transfer; the gas convection process is also the transportation process of silicon raw materials, and poor air permeability is not conducive to the transportation of silicon raw materials , which is extremely unfavorable to the formation of silicon carbide products

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