US 5,203,901 A · Method for converting waste to crystallized glass

Abstract

A processing method is presented for treating sludges from municipal and waste materials. The ashes from such sludges, containing SiO.sub.2 as a primary constituent, are treated with additives to tailor the feed material composition. Thermal processing, including melting, rapid cooling and subsequent annealing, produces a crystallized glass microstructure in which needle-shaped shaped crystals of anorthite and .beta.-wollastnite are infiltrated with a vitreous material. Such crystallized glasses having superior mechanical and aesthetic properties are an attractive architectural material which can be utilized for interior finishing, exterior walls, flooring as well as for interior decorations.

Claims13

Dependent claims

A process for converting a waste material ash of a specific composition into a crystallized glass containing at least one phase of anorthite and .beta.-wollastnite crystal phases, said process comprising the steps of:

(a) preparing said waste material to produce a feed material, including a step of mixing with additives to provide said specific composition;
(b) melting said feed material in a furnace to produce a melt at temperatures between 1300 to 1500.degree. C.;
(c) cooling said melt rapidly to produce a glassy charge;
and
(d) heat treating said glassy charge to produce a crystallized glass containing at least one phase of anorthite and .beta.-wollastnite phases infiltrated with a vitreous material.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application

07/809,883Filed 18 Dec 1991

Priority

JP 2-41377225 Dec 1990

Granted

20 Apr 1993

Term ends

Not estimatedThe source records don’t support an estimate.

Classification4 codes

C03C 10/0063
Devitrified glass ceramics, i.e. glass ceramics having a crystalline phase dispersed in a glassy phase and constituting at least 50% by weight…
C03C 1/002
Ingredients generally applicable to manufacture of glasses, glazes, or vitreous enamels: use of waste materials, e.g. slags
C03C 10/0036
Devitrified glass ceramics, i.e. glass ceramics having a crystalline phase dispersed in a glassy phase and constituting at least 50% by weight…
C03C
Chemical composition of glasses, glazes or vitreous enamels

Method for converting waste to crystallized glass

Life of this patent

Method for converting waste to crystallized glass

Life of this patent

Abstract

Claims13