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borsilikatpulver and processes for the manufacture of a borsilikat - zellenkoerpers from this powder
borsilikatpulver and processes for the manufacture of a borsilikat - zellenkoerpers from this powder
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机译:硼硅石粉和用这种粉末生产硼硅石-zellenkoerpers的方法
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摘要
An aqueous slurry comprising an intimate mixture of colloidal silica, (preferably an amorphous, precipitated, hydrated silica), caustic potash, boric acid and alumina is first prepared and then dried. The dried aggregates are thereafter crushed, calcined and rapidly quenched. It is preferred to dry the slurry in a spray drier and thereafter omit crushing after drying and to calcine the dried admixture by means of a plasma arc so that the mixture is rapidly quenched after calcination. The calcined mixture is introduced into a crusher, such as a ball mill, with a carbonaceous cellulating agent and reduced to a fine pulverulent material. The pulverulent material is then cellulated in a cellulating furnace to form cellular borosilicate bodies. Where desired, the calcined material may be utilized as a ceramic frit.
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