US 5,008,053 AGranted

Process for producing a ceramic product using sludge ashes

AssigneeFujimi Ceramic Co., Ltd.

InventorsRyusuke Hashimoto, Mitsuru Iwata, Junichi Sugihara, Minoru Iwase

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Abstract

A process for producing a ceramic product using sludge ashes comprises the steps of (i) mixing at least ashes obtained by burning a sludge which has been obtained by the treatment of sewage and a plastic ceramic raw material to prepare a first body, (ii) mixing at least a plastic ceramic raw material and a fusible material to prepare a second body, (iii) supplying the first and second bodies into a matrix of a molding machine such that the first and second bodies form a lower, larger layer and an upper, smaller layer which covers the lower layer, respectively, (iv) molding the whole of the first and second bodies into an object with a desired shape, and (v) firing the molding to produce a two-layer ceramic product.

Claims2

Dependent claims

A process for producing a ceramic product using sludge ashes, comprising the steps of

(a) mixing at least (i) ashes obtained by burning a sludge which as been obtained by the treatment of sewage and (ii) a plastic ceramic raw material to prepare a first body,
(b) mixing at least a plastic ceramic raw material and a fusible material to prepare a second body,
(c) supplying the first and second bodies into a matrix of a molding machine such that the first and second bodies form a lower, major layer and an upper, surface layer which covers the lower layer, respectively,
(d) molding the first and second bodies as one body into an object with a desired shape, and
(e) firing a molding obtained in the step (d), thereby producing a two-layer ceramic product whereby the effects of different sewage treatments on the quality of the resultant product is largely mitigated.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application: 07/418,141Filed 6 Oct 1989 · continuation in part
Priority: JP 1-2051048 Aug 1989
Granted: 16 Apr 1991
Term ends: Not estimatedThe source records don’t support an estimate.

Classification11 codes

B32B 18/00
Layered products essentially comprising ceramics
C04B 33/1357
Incineration residues: sewage sludge ash or slag
C04B 2235/656
Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting…
C04B 2235/6567
Characterised by specific heating conditions during heat treatment: treatment time