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High-density solids pumps are hydrostatically operating machines which displace the medium being pumped and thus create a flow. ==High-density solids and their transport== High-density solids are mixtures of liquid and solid constituents. Each have their own typical physical and chemical characteristics such as specific weight, solids content, maximum particle size as well as how they behave, for example thixotropical, abrasively or adhesively. Typical examples for high-density solids are Concrete, sludges and slurries. Within industrial plants many substances with high proportion of solids - such as mechanically dewatered sewage sludges, filter cakes, bituminous coal sludges, waste and process sludges - have to be transported over relatively great distances to landfills or incineration plants. In principle, long conveying distances can be bridged with mechanical conveying equipment or hydraulical high-density solids pumps. Types of mechanical conveyors are belt, screw (worm), or scraper. They are suitable for nearly all types of high-density solids. Hydraulical high-density solids pumps move sludges and slurries within an enclosed pipeline. However, not every sludge or slurry is pumpable, depending on: * Ratio: The mixture of solid and liquid components must be such that it results in a plastically deformable mass. * Saturation: The volume of pore space in the sludges must be filled with sufficient quantity of solid matter for particle to be able to rest on particle via a plastically viscous liquid and for interstices to be filled. * Gas component: As a consequence of pressure fluctuations knocking in the pipe may happen. By injection of about 2% air, sludges which do not naturally have a gas component can be brought to a better consistency. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「High-density solids pump」の詳細全文を読む スポンサード リンク
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