| 摘要 |
A method of treating a coolant liquid used for cooling rolls of a rolling mill or for cooling a continuous caster and contaminated with particles of scale is described. This comprises passing the contaminated coolant liquid through a primary settling zone (11), retaining the cooling liquid in the primary settling zone (11) for a period sufficient to permit substantially all particles of scale having a particle size greater than about 200 mu m to settle out under gravity from suspension, recovering from the primary settling zone (11) an intermediate liquor which is substantially free from particles of scale having a particle size greater than about 200 mu m, passing the intermediate liquor along a flow path which includes a portion (13) wherein the intermediate liquor is flowing under substantially streamline flow conditions, said portion (13) comprising a length of conduit (16) made of non-magnetic material adjacent to which is or are positioned one or more magnets (23, 24) arranged to produce a substantially constant magnetic field within said length of conduit (16), subjecting the intermediate liquor in passage through said portion (13) to said substantially constant magnetic field thereby to coagulate iron-containing particles in the intermediate liquor and enhance sedimentation of resulting coagulated particles in the intermediate liquor, and collecting resulting treated liquor now containing less than about 50 ppm solids by weight for reuse for cooling the rolls (2, 3) of a rolling mill or for cooling a continuous caster. |
