| 摘要 |
<p>The invention relates to a method of purifying pulp and to a separating apparatus. According to the method, the pressure difference across the hydrocyclone (1) is kept substantially constant by raising the pressure of the pulp conducted to the hydrocyclone (1) by a pump (3) preceding the hydrocyclone (1) and by returning part of the purified pulp discharged from the hydrocyclone to the inlet channel (2) of the pulp before the pump (3) so that substantially a constant amount of pulp flows through the hydrocyclone (1) in a unit of time. The separating apparatus comprises a pump (3) mounted in the inlet channel (2) of the pulp, a return channel (12) running from the outlet channel (11) to the inlet channel (2) before the pump (3) and provided with a valve (13), and a pressure difference regulator (17) provided with pressure sensors (14, 16) and arranged by means of the sensors (14, 16) to measure the pressure difference across the hydrocyclone (1) and to adjust the valve (13) so that the pressure difference remains substantially constant.</p> |
