| 摘要 |
PCT No. PCT/AU82/00032 Sec. 371 Date Nov. 17, 1982 Sec. 102(e) Date Nov. 17, 1982 PCT Filed Mar. 17, 1982 PCT Pub. No. WO82/03187 PCT Pub. Date Sep. 30, 1982.The invention provides a spiral separator of the type for use in separating a pulp of water and minerals into mineral fractions of differing densities and having a helical trough (30) supported with its axis upright. The shape of the trough working surface profile (30) varies (FIGS. 2A-2D) from place to place along the trough. The profile has a point of maximum displacement (32A, 32B, 32C, 32D) at which profile (30) is at a maximum spacing below a notional straight line (40) joining the inner end (31) and outer end (22) of the trough working surface profile (30). The distance of the point of maximum displacement (32A, 32B, 32C, 32D) from one end (31 or 22) of the profile varies along the trough. A method for manufacture of troughs according to the invention is also described and claimed. |
