Abstract: The invention relates to a method for cleaning water or an aqueous flow electrochemically by flotating impurities contained in water for collecting the impurities from a surface of the water. The method includes conveying the water flow to be cleaned through at least one particle bed which behaves bipolarically under electric voltage, which bed is formed of an anode and a cathode and metal particles arranged between the anode and the cathode; leading a changing direct current to the particle bed to maintain electrochemical reactions on anodic regions and cathodic regions of the particles; and dissolving metal of the particles electrochemically to water to split water to micro bubbled hydrogen gas H2 for the flotation and to hydroxide ions OH— for increasing pH of water. The invention relates also to an apparatus for cleaning water or an aqueous flow electrochemically.

Abstract: The invention relates to a control apparatus for controlling a rock-drilling rig performing a multiphase rock-drilling event. The control apparatus is arranged to display a working phase indicator on a display, and rock drilling phase-specific information elements is associated with different working phases. The control apparatus is arranged to specify the phase of the rock-drilling event and to update the working phase indicator to display at least one display information element in accordance with the specified working phase.

Abstract: A method of controlling operation of a rock drilling rig, and a rock drilling rig. A rate of flow of a flushing medium of the rock drilling rig is determined, and the operation of the rock drilling rig is controlled on the basis of the determined rate of flow by influencing pressure of the flushing medium.

Abstract: A push-button arrangement and a push-button. The push-button comprises a fastening sleeve portion having a press portion at a first end thereof and a fastening member at a second end thereof for connecting the push-button to a fastening hole in a fastening plate. The outer surface of the fastening sleeve portion is provided with at least one conical sealing surface and the fastening hole, correspondingly, with a conical counter surface.

Abstract: A push-button arrangement and a push-button. The push-button comprises a fastening sleeve portion having a press portion at a first end thereof and a fastening member at a second end thereof for connecting the push-button to a fastening hole in a fastening plate. The outer surface of the fastening sleeve portion is provided with at least one conical sealing surface and the fastening hole, correspondingly, with a conical counter surface.

Abstract: A method of controlling operation of a rock drilling rig, and a rock drilling rig. A rate of flow of a flushing medium of the rock drilling rig is determined, and the operation of the rock drilling rig is controlled on the basis of the determined rate of flow by influencing pressure of the flushing medium.

Abstract: The invention relates to a control apparatus for controlling a rock-drilling rig performing a multiphase rock-drilling event. The control apparatus is arranged to display a working phase indicator on a display, and rock drilling phase-specific information elements is associated with different working phases. The control apparatus is arranged to specify the phase of the rock-drilling event and to update the working phase indicator to display at least one display information element in accordance with the specified working phase.