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Under the Stone, Clay, Glass, and Concrete is the Structural Clay industry which will be the primary focus of the report. Clay consists of the finest-grain particles in sediment, soil, or rock, and a rock or a deposit containing a large component of clay-size material. Clay can be composed of any inorganic materials, such as clay minerals, allophane, quartz, feldspar, zeolites, and iron hydroxides, that possess a sufficiently fine grain size. Along with organic matter, water, and air, clays are one of the four main components of soil. Physical properties of clay include plasticity when wet, the ability to form colloidal suspensions when dispersed in water, and the tendency to clump together (flocculate) and settle out in saline water. Establishments that fall within the Structural Clay Products Industry (SIC code 325) are primarily engaged in using different types of clay and other additives to manufacture brick and structural clay tile, ceramic wall and floor tile, clay firebrick and other heat-resisting products, and clay sewer pipe. The mining of clay used to make structural clay products are not included within SIC code 32.
The U.S. Bureau of Mines categorizes clay into six groups: ball clay; bentonite; common clay and shale; fire clay; fuller's earth; and kaolin. Ball clay is a plastic, white-firing clay that has a high degree of strength as well as plasticity. Principal ball clay markets in 1992 were pottery, floor and wall tile, and sanitary ware. Bentonite is a clay composed mainly of smectite minerals. The three major uses of bentonite in 1992 were drilling mud, foundry sand, and iron ore pelletizing. Common clay and shale contain mixtures of differing proportions of clay, including illite, chlorite, kaolinite, and montmorillonite, plus other nonclay materials. The largest user of these clays is the structural clay products industry, which manufactures brick, drain tile, sewer pipe, conduit tile, glazed tile, and terra cotta. Fire clays can withstand very high temperatures and consist mainly of kaolinite. These clays are used in commercial refractory products such as firebrick and block. Fuller's earth, either the attapulgitetype or montmorillonite-type, is used in pet waste absorbents, oil and grease absorbents, and pesticide carriers.
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The focus of this paper will primarily be placed on ball clay which is used for the production of ceramic floor and wall tile for home and industrial uses. The manufacture of clay products involves the conditioning of basic clay ores by a series of processes. These include separation and concentration of clay minerals by screening, floating, wet and dry grinding, and blending of desired ore varieties; followed by forming; cutting or shaping; drying or curing; and firing of the final product. The Stone, Clay, Glass and Concrete Industry is quickly growing industry and with any emergent industry, especially production industries, the need for pollution control increases along with growth.
The following regulations apply to the Stone, Clay, Glass and Cement Industry: RCRA (Resource Conservation and Recovery Act), CERCLA (Comprehensive Environmental Response Compensation and Liability Act, EPCRA (Emergency Planning and Community Right-to-know Act, CWA (Clean Water Act), CAA (Clean Air Act), and TSCA (Toxic Substances Control Act). The top ten chemicals released by the Stone, Clay, Glass, and Concrete Products Industry in 1993 were Ammonia, Formaldehyde, Hydrochloric acid, Hydrogen fluoride, Methanol, Phenol, Styrene, Sulfuric acid, Toluene, Xylene (mixed isomers). To date, EPA has focused much of its attention on measuring compliance with specific environmental statutes. This approach allows the Agency to track compliance with the Clean Air Act, the Resource Conservation and Recovery Act, the Clean Water Act, and other environmental statutes. Within the last several years, the Agency has begun to supplement single-media compliance indicators with facility-specific, multimedia indicators of compliance. In doing so, EPA is in a better position to track compliance with all statutes at the facility level, and within specific industrial sectors. Releases are an on-site discharge of a toxic chemical to the environment. This includes emissions to the air, discharges to bodies of water, releases at the facility to land, as well as contained disposal into underground injection wells. Releases to air (point and fugitive air emissions) include all air emissions from industry activity. Point emissions occur through confined air streams as found in stacks, ducts, or pipes. Fugitive emissions include losses from equipment leaks, or evaporative losses from impoundments, spills, or leaks. Releases to water (surface water discharges) encompass any releases going directly to streams, rivers, lakes, oceans, or other bodies of water. Any estimates for storm water runoff and non-point losses must also be included. Releases to land includes disposal of waste to on-site landfills, waste that is land treated or incorporated into soil, surface impoundments, spills, leaks, or waste piles. These activities must occur within the facility's boundaries for inclusion in this category.
Underground injection is a contained release of a fluid into a subsurface well for the
purpose of waste disposal.
The best way to reduce pollution is to prevent it in the first place. Some companies have creatively implemented pollution prevention techniques that improve efficiency and increase profits while at the same time minimizing environmental impacts. This can be done in many ways such as reducing material inputs, re-engineering processes to reuse by-products, improving management practices, and employing substitution of toxic chemicals. Some smaller facilities are able to actually get below regulatory thresholds just by reducing pollutant releases through aggressive pollution prevention policies.