| 摘要 |
Glass cullet such as recycled municipal waste is processed to substantially eliminate contaminants including light weight paper and polymer, ferrous and nonferrous metal and also ceramics, pyroceramics, tempered glass, stones and assorted silicates that have properties approximating those of glass. In a series of washing and sorting steps, different mechanical, chemical, electromagnetic, and thermal processes cause distinct materials in the cutlet to react differently, whereupon the contaminants are selectively removed and the glass is processed on. The cullet is crushed; ferrous and nonferrous metals are detected and diverted, a screening station sizes cullet particles and routes larger sizes back for additional crushing. An air blower entrains and removes light fractions and dust. A wash station entrains and removes dirt and soluble material. In a flow of sized particles, further metal and ceramic (non-glass silica) detection devices divert portions of the flow sensed to contain non-glass materials. The non-glass non-metallic contaminants are removed by processing to achieve distinct temperatures and also by sorting as a function of particle density. The respective steps are provided along a continuous series of conveyors between processing stations such that the cullet is processed directly through the steps from the raw to finished product. Clean, dry, sized glass particles, including fine glass powder, is produced and can be used for making new glass products.
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