| 摘要 |
<p>A method of making a product including mixing together slate particles, clay particles, and water to a generally formable homogenous mixture; the slate particles and the day particles of the mixture, substantially all being sized so as to pass through a sieve of 1 mm, and such that not more than 25% of the slate particles have a size less than 63 microns, and the ratio by weight of the slate to day in the mixture being between 40% and 80% of the particles, the method including forming the wet mixture to a desired cross sectional shape by extruding the mixture, at least partially drying the formed mixture, cutting the extruded formed mixture into required lengths, and firing the cut lengths at a temperature of at least 950°C and for a time sufficient for at least some of the clay to convert into a binder to bind together the slate particles</p> |
