Low density ceramics produced from paper recycling residuals

An improved method for preparing low density ceramics is described wherein the process incorporates paper residuals which are a by-product of the paper recycling process. The method for making a low density-ceramic comprises the steps of: a) providing a paper residual comprising from about 0.5 to about 99 percent, by weight, of at least one filler, from about 0 to about 20 percent, by weight, of a dye, from about 0 to about 10 percent, by weight, of an ink, from about 0.5 to about 99.5 percent, by weight, of paper fiber, and from about 0 to about 30 percent, by weight, of other components, based on a dry weight of the residual; b) admixing a ceramic material with the paper residual, the ceramic material comprising up to about 90%, by weight, of the admixture, based on a dry weight of the admixture; c) forming the admixture into a desired shape; and d) firing the admixture to a temperature ranging from about 1850.degree. F. to about 2900.degree. F

Process for separating hazardous metals from waste materials during vitrification

A process and system for separating metals from a waste composition and for producing a reusable glass product is disclosed. The process includes heating waste materials containing at least one glass forming substance to a temperature sufficient to volatilize any volitile metals contained within the waste material. The waste material is also heated to a temperature and for a time sufficient for substantially all of the glass forming substances contained within the material to melt and form a molten glass. In one embodiment, the waste materials are heated in a reducing atmosphere in a direct contact radiant heating device, such as an electric arc furnace

Process for recycling spent pot liner

The process includes the steps of combining silica with the spent pot liner in order to convert a majority of the spent pot liner into silicon carbide. Specifically, the silica reacts with carbon in the spent pot liner to form silicon carbide. In order to form the silicon carbide, the materials are heated, such as in an electric resistance heater. The formed silicon carbide is free of contaminants and can be used for many useful purposes

South Carolina brick masonry - green forever : insights in preservation and restoration

This 5 part power point presentation discusses the history of brick masonry, how bricks are made and how new bricks can be made for use in conservation of old buildings

Method for processing clay ceramic materials

A method of forming bricks, tiles, and the like by treating clay, shale or other clay ceramic raw materials containing pyrite is disclosed. Such clay, ceramic raw materials may be ground, and then mixed with an oxidizer in a pre-oxidation step to disperse the oxidizer within the clay to expose the maximum amount of clay surface to the oxidizer. One oxidizer that may be used is an aqueous solution of hydrogen peroxide. Clay is shaped into clay products and then heated to elevated temperatures. Pyrite within the clay is oxidized, thereby removing sulfur-containing compounds such as sulfur dioxide from the clay. The application of the invention may assist in preventing efflorescense by ensuring complete or nearly complete removal of pyrite from products oxidation treatment and subsequent firing at elevated temperatures. Similarly, by enhancing the oxidation of pyrite, faster firing cycles may be possible which facilitates reduced fuel consumption and faster process time