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Metal Casting Technologies : Dec 2009
METAL Casting Technologies December 2009 47 ollution control is that part of ecology that should interest and concern foundries. Being generators of pollutants of air, water, and the environment in general, foundries should be really involved in diminishing their contributions to these hazards to the environment. These general guidelines are made to address the issue and, hopefully, shall be observed by the Foundry Companies in doing their share in preventing the devastation of the environment. Environmental issues Everyone who works in a foundry is responsible for observing Safety, Health and Environment (SHE) and in getting these right and correctly. Good "SHE" performance is regarded as critical to the success of foundry operations. Simply stated, the goals are: 1. NO accidents 2. NO harm to people 3. No damage to the environment The Foundry shall continually drive the health and environment impact of the operations to reduce waste, emissions and discharges, and use energy efficiently. It is aware of and is committed to take the necessary steps to control pollution of the environment, although the pollutants in foundry operations are not as grave (not even 0.5% as serious as other pollutants, see diagram below) as the pollutants in other industries, e.g., the semi-conductor industries, recycling of used computers and automotive batteries, and the transportation and trucking industries. It is a fact that workers in foundries reach retirement age without any industry-inflicted disabilities. In contrast, workers in semi-conductor industries generally are all below 40 years old, simply because the zinc fumes in the air-conditioned factories take their toll. Regardless of this, the Foundry Company will do its part. What follows are the known sources of pollution in a foundry using the green-sand process of molding and duplex-melting with a cupola and an induction furnace; and how they could be effectively controlled. Reuse of foundry sand Sand is one of the major wastes in ferrous foundries. Foundries are equipped with sand reclamation equipment which partially reclaims sand for subsequent reuse. Used foundry sand can be reused in various applications as an alternative to sending it to landfill. Reuse options include cement manufacture, asphalt, concrete, hollow blocks, and bricks for construction applications. It is not only better for the environment, but it is more profitable for the foundry to sell the sand to an alternative user. Liquid wastes ● Liquid waste shall not be disposed of on the land indiscriminately. ● If liquid waste is stored on site, it shall be labeled and packaged properly and then stored securely in a roofed area. The foundry and the environment P By Prof. John H. D. Bautista, Technical Consultant, PMAI, 2009 Foundry Shops MW sShops Others Vehicles FOUNDRY INDUSTRY VIS-A-VIS ALL POLLUTANTS 300000 250000 200000 150000 100000 50000 As of Year AD2002: ● There are 180 foundries (actual) ● There are about 5,000 metalworking shops, (estimate) ● There are about 10,000 other manufacturing shops (estimate) ● There are about 300,000 vehicles (estimate in NCR only) Back to the
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