Fused quartz ceramic hearth roll production process
A production process and technology of fused silica, which is applied in the field of production process of fused silica ceramic hearth rolls, can solve the problems such as the life and quality of carbon sleeve rolls that plague the annealing line, affect the normal production of the annealing furnace, and the use conditions are not ideal, and can solve the problems of high temperature The effect of nodulation, reducing the energy consumption of repeated shutdown and improving the production rate
Inactive Publication Date: 2012-12-19
左胜
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Problems solved by technology
Since the silicon steel continuous annealing furnace of my country's silicon steel production line was put into operation in 1978, the furnace rollers used have been imported from Japan with G-treated carbon sleeves, that is, graphite carbon sleeves treated with chromium anhydride, but the life and quality of carbon sleeve rolls have always troubled the annealing line. Therefore, my country has successively introduced untreated carbon sleeves from the United States and developed metal sprayed ceramic rollers, but the usage conditions are still not ideal.
Although domestically produced G-treated carbon sleeves and P-treated carbon sleeves have replaced imported carbon sleeves and reduced production costs, furnace roll nodulation, roll surface oxidation, looseness, and peeling often occur, especially when the furnace temperature is higher than When the temperature is above 900°C, the defects will increase and the service life will be shorter, which will seriously affect the normal production of the annealing furnace
The currently used quartz ceramic hearth roller is made of high-purity SiO2, which is an amorphous material with high strength and good wear resistance. At high temperatures above 800°C, this material is not easy to adhere to nodules, especially It is a furnace roller with excellent oxidation resistance and a service life much better than other materials, but it is only suitable for the production of low-grade silicon steel below 900°C, and it is still easy to form nodules when the temperature is higher than 900°C
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[0031] The first step is to select the raw material. The main component of the raw material is silicon dioxide. The graded raw material on the market is used for dry powder gradation. The purity of the raw material is required to be greater than or equal to 99.85%, and the moisture content is less than 2%. The heavy metal impurities in the raw material must be controlled within the quality When the fraction is less than 0.15%, the heavy metal impurities are harmful. They will become the crystal seeds (nuclei) of fused quartz crystallization during the sintering process of fused quartz ceramic rollers, resulting in crystallization of fused quartz, and finally the product will crack.
[0032] It is the purpose of the present invention to increase the density of the ceramic roll, reduce the porosity of the ceramic roll, and control the shape of the pores. The present invention carries out gradation according to the mass fraction, and uses graded raw materials on the market to carr...
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The invention relates to a fused quartz ceramic hearth roll production process which comprises the following steps: selecting raw materials, decocting silicasol, preparing paste, drying spherical powder lumps, manufacturing and processing a blank, sintering the blank, and processing. The invention has the characteristics of high strength, wear resistance, high density, small porosity and the like, is long in service life, and can avoid high-temperature accretion, improve the silicon steel production operation rate, reduce the shutdown time and lower the repeated shutdown / start energy consumption on the basis of greatly reducing the cost. The invention establishes a novel raw material formula and process for ceramic hearth roll production and other special technologies, and effectively solves the technical problems on density, porosity and pore morphology.
Description
technical field [0001] The invention relates to a production process of a hearth roll of a metallurgical high-temperature continuous annealing furnace, in particular to a production process of a fused quartz ceramic hearth roll. Background technique [0002] Since the quality of the bottom roll of the silicon steel continuous annealing furnace is one of the key factors directly affecting the operation rate and the surface quality of the product, the continuous annealing furnace has a large-pore adsorption effect on the bottom roll of the continuous annealing furnace. When used at a high temperature exceeding 900 ° C, The free iron element in the reduced state in the continuous annealing furnace is actively multiplied, and is adsorbed and accumulated in the large dominant pores on the roll surface to form a raised state, which is called "nodules" on the furnace bottom roll. Nodules cause scratches on the plate surface Injuries cause steel plate quality problems. During nodul...
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IPC IPC(8): C04B35/66
Inventor左胜
Owner左胜