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The production of refractories from natural materials involves a large number of operations in preparing the raw materials: crushing, firing, milling, screening, incorporating additives, etc., all of which complicate the process and make it expensive. The number of processes can be reduced by reworking the natural raw material into granulated material.This article deals with an investigation of the properties of spherical granules obtained by blowing molten magnesiasilicate raw material, which is used for the production of forsterite refractories.Forsterite possesses a number of positive qualities: high refractories (1890~ low thermal conductivity, absence of phase inversions of the first order up to the melting temperature, and metal-and slag-resistance [1, 2]. However, its working properties are closely related to the composition and amounts of impurities. Forsterite refractories are obtained from magnesiasilicate raw materials which should satisfy the following requirements: mass proportion of iron (as Fe304) not more than 6%, CaO not more than 1.5%, AI203 not more than 2.5%, and MgO not less than 37% [3].Forsterite refractories are made with rocks rich in magnesia: dunites, olivine ores, serpentines, talc shales, etc. Dunites most closely meet the requirements of the raw materials: they contain 95-97% olivines and 3-5% chromites. Olivine ores contain mainly olivine and small amounts of impurities: it is richer in iron. Serpentine ores and talc shales have a high water content and sometimes a lower magnesia content.
The production of refractories from natural materials involves a large number of operations in preparing the raw materials: crushing, firing, milling, screening, incorporating additives, etc., all of which complicate the process and make it expensive. The number of processes can be reduced by reworking the natural raw material into granulated material.This article deals with an investigation of the properties of spherical granules obtained by blowing molten magnesiasilicate raw material, which is used for the production of forsterite refractories.Forsterite possesses a number of positive qualities: high refractories (1890~ low thermal conductivity, absence of phase inversions of the first order up to the melting temperature, and metal-and slag-resistance [1, 2]. However, its working properties are closely related to the composition and amounts of impurities. Forsterite refractories are obtained from magnesiasilicate raw materials which should satisfy the following requirements: mass proportion of iron (as Fe304) not more than 6%, CaO not more than 1.5%, AI203 not more than 2.5%, and MgO not less than 37% [3].Forsterite refractories are made with rocks rich in magnesia: dunites, olivine ores, serpentines, talc shales, etc. Dunites most closely meet the requirements of the raw materials: they contain 95-97% olivines and 3-5% chromites. Olivine ores contain mainly olivine and small amounts of impurities: it is richer in iron. Serpentine ores and talc shales have a high water content and sometimes a lower magnesia content.
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