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Filtering medium for molten metal and method for producing the same

A filter medium and molten metal technology, applied in chemical instruments and methods, separation methods, filtration and separation, etc., can solve the problems of fast formation of filter cake layer and insufficient transmittance, and achieve the effect of high inclusion removal performance

Inactive Publication Date: 2010-02-24
NGK INSULATORS LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although most of the inclusions in the molten metal are filtered by the filter cake layer formed on the outer surface of the filter medium inflow side, the inflow side of the filter medium for molten metal disclosed in JP1995-23099Y is a microporous ceramic layer, so that Cake layer formation is fast
resulting in insufficient transmittance

Method used

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  • Filtering medium for molten metal and method for producing the same
  • Filtering medium for molten metal and method for producing the same
  • Filtering medium for molten metal and method for producing the same

Examples

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Embodiment

[0031] Examples and comparative examples of the present invention will be described below.

[0032] Table 1 shows the results where the wall thickness was constant at 25 mm, the pore diameter of the macroporous ceramic layer (shown as macroporous layer) and the pore diameter of the microporous ceramic layer (shown as microporous layer) were varied to calculate Inclusion trapping performance and service life in aluminum molten metal. In any embodiment, 8-12% by mass of inorganic binder, 1-2% by mass of forming binder, 5-7% by mass of water, and the balance aggregate will be included. Each layer is continuously molded into a molded body having a predetermined shape. Then, the molded body is dried and then heated to 1200˜1400° C. to melt the binder. Thereafter, the binder was crystallized by cooling to 800°C at a cooling rate of 30-70°C / hour. As a result, a base material is produced in which aggregate particles are connected by a binder in a state where pores are formed betwee...

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Abstract

A filtering medium for molten metal which is excellent in inclusion removal performance and durability and further may provide sufficient throughput and a method for producing the same. A filtering medium for molten metal in the present invention includes a two-layered structure of a macropore ceramic layer at the inflow side and a micropore ceramic layer at the outflow side. The average pore diameter of the micropore ceramic layer is from 100 to 500 mum and the average pore diameter of the macropore ceramic layer is 1.1 to 3.0 times as large as that of the micropore ceramic layer. When respective layers are formed of aggregates bonded with an inorganic binder and the inorganic binder has a needle crystal structure with an aspect ratio of 2 to 50, the inside of filtering medium may be contributed to the filtration and the compatibility between inclusion-trapping performance and lifetime may be ensured.

Description

technical field [0001] The present invention relates to a ceramic filter medium for filtering molten metal, especially molten aluminium, and to a method of producing the filter medium. Background technique [0002] Aluminum sheet or foil is produced by casting molten aluminum into ingots which are then rolled. However, if the ingot is contaminated with inclusions such as metal oxides or solid impurities such as refractory fine fragments contained in the molten metal of aluminum, it will be lost during the rolling of the ingot into sheet or foil etc. Blowholes or surface defects occur in these products. In order to prevent these defects, it is necessary to remove solid impurities from the molten metal. [0003] As described in Japanese Patent Application Laid-Open JP1985-5828A and Japanese Utility Model Application Publication No. JP1995-23099Y, aluminum is removed by filtering molten metal using ceramic filter media for molten metal Solid impurities such as inclusions. H...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D29/58B01D39/20B22D43/00C04B38/00
CPCC22B9/023Y02P10/20
Inventor 古宫山常夫樋口阳人堀田启之
Owner NGK INSULATORS LTD
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