Showing papers on "Co-processing published in 2000"

Lime and Limestone

Abstract: Lime and limestone are mainstays of the construction industry, in chemical and metallurgical production, and for other industrial and agricultural uses. In the United States limestone production comprises about 75% of total stone output. Lime is produced from high purity limestone. The geological, physical, and chemical properties of lime and limestone are described as well as steps in production and primary uses. Whereas limestone is primarily a construction material used especially in road building, it is also used in the production of pig iron, glass, cement, and lime, as a scrubbing agent for removal of SO2 from stack gases, as a mineral filler, etc. Lime is primarily a chemical and metallurgical raw material, used in the production of steel, gold and copper, aluminum, calcium carbide, pulp and paper, etc. It is also a leading material in environmental uses, such as SO2 removal from power plant stack gases, in potable and wastewater treatment, and for hazardous wastes. Lime is also an important construction material, used in masonry mortar, plaster, and stucco, in road building to stabilize highly plastic clays, and in manufacture of calcium silicate building products such as sand–lime brick. Growth is expected in scrubbing stack gases, in the production of precipitated calcium carbonate for use as a filler in fine white paper, and for sterilizing sewage sludge for cropland use.

Some geotechnical properties of waste glass

Abstract: An increase in demand for aggregates and environmental and economic concerns over the disposal of waste has led to an interest in the use of recycled materials for construction purposes. Many recycled materials have the potential for use in construction but little research has been carried out into their performance. This paper identifies some of the properties of waste glass which suggest possibilities for its use in geotechnical situations. Three samples of crushed waste glass are tested for permeability, shear strength, crushing resistance and small-strain stiffness and the results show that the glass samples have the potential to perform as well as gravel. (A)

Method of exploitation of solid waste material by thermal co-processing with mineral raw materials of the production of hydraulic cement with a wide range of applications

Abstract: The invention concerns a technological method to utilise solid waste by thermal co-processing with certain added mineral raw materials in a special, three-part, thermal processing kiln for production of a hydraulic mortar of wide application. The method is characterised by pre- processing of the solid waste, drying and separation into heavy and light fractions. The heavy fraction is fed into the middle, static, part of the kiln where it meets the mixture of mineral raw materials which is fed into the upper, revolving, part of the kiln. The light fraction, mixed with a conventional combustible material, is fed into the burner of the kiln in the lower, revolving, section. The product from the kiln consists of cement clinker which on milling and the addition of gypsum gives a hydraulic mortar as the end product. The method ensures no residues are produced, utilisation of the ash of the solid waste, restriction of atmospheric pollution, the facility to utilise solid waste and the viability of the production process.