| 摘要 |
An apparatus and method for crushing clay to reduce the size of the clay to a uniform particle size distribution without generating a substantial percentage of undersized particles. Oversized clay particles are fed to a first roller mill between a first pair of counter-rotating, adjacent, grooved rollers. The particles exiting the first roller mill that have the desired particle size distribution are separated from the undersized and oversized clay particles exiting the first roller mill, prior to crushing the oversized particles in a second roller mill. The oversized particles from the first roller mill then are fed to the second roller mill between a second pair of counter-rotating, adjacent rollers that are separated by a roller gap that is smaller than a roller gap of the first roller mill. By providing grooves in the outer surfaces of at least the first pair of rollers, in the first roller mill, and by removing the on-size particles prior to sending the over-size particles to the second roller mill, about 85% to about 95% of the clay feed is crushed to the desired particle size. It should be noted that the particle size distribution is set between a top screen and bottom screen, the product being recovered between the two screens, and the particle size distribution can be fixed by adjusting the roller gap between the rollers of one or more roller mills of the apparatus to achieve a specified particle size distribution.
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