A method for removing solid particles and tar component from carbon monoxide gas which contains solid particles and volatile tar components, in which method - carbon monoxide gas is conducted from a ferroalloy smelting furnace to a gas scrubber, - the carbon monoxide gas is scrubbed in the gas scrubber by a liquid medium for removing part of the solid particles, - the carbon monoxide gas is conducted from the gas scrubber to a blower, - the flow rate of the carbon monoxide gas is increased by the blower, and - the carbon monoxide gas is conducted to a particulate filter, - by means of the particulate filter, the remaining solid particles are essentially filtered from the carbon monoxide gas, characterized in that prior to conducting the carbon monoxide gas to the particulate filter, said gas is conducted to a particle feeder, where finely divided adsorbent particles are fed to the carbon monoxide gas for adhering the tar component on the surface of the adsorbent particles, and the carbon monoxide gas flow containing adsorbent particles is conducted to the particulate filter, so that the tar component adhered to the adsorbent particles is discharged in the particulate filter, in the particle feeder the flow rate of the carbon monoxide gas is accelerated by a venturi pipe and the adsorbent particles are mixed in the carbon monoxide gas with an accelerated flow rate in the venturi pipe by means of a feed pipe opening into the venturi pipe, and that the adsorbent powder is stored in a gas-tight tank; and oxygen-free inert gas, such as nitrogen or carbon dioxide, is fed through a gas duct to the tank in order to create an inert gas atmosphere inside the tank, and a continuous adsorbent flow is fed via a shut-off feeder from the tank to the feed pipe. - carbon monoxide gas is conducted from a ferroalloy smelting furnace to a gas scrubber, - the carbon monoxide gas is scrubbed in the gas scrubber by a liquid medium for removing part of the solid particles, - the carbon monoxide gas is conducted from the gas scrubber to a blower, - the flow rate of the carbon monoxide gas is increased by the blower, and - the carbon monoxide gas is conducted to a particulate filter, - by means of the particulate filter, the remaining solid particles are essentially filtered from the carbon monoxide gas, characterized in that prior to conducting the carbon monoxide gas to the particulate filter, said gas is conducted to a particle feeder, where finely divided adsorbent particles are fed to the carbon monoxide gas for adhering the tar component on the surface of the adsorbent particles, and the carbon monoxide gas flow containing adsorbent particles is conducted to the particulate filter, so that the tar component adhered to the adsorbent particles is discharged in the particulate filter, in the particle feeder the flow rate of the carbon monoxide gas is accelerated by a venturi pipe and the adsorbent particles are mixed in the carbon monoxide gas with an accelerated flow rate in the venturi pipe by means of a feed pipe opening into the venturi pipe, and that the adsorbent powder is stored in a gas-tight tank; and oxygen-free inert gas, such as nitrogen or carbon dioxide, is fed through a gas duct to the tank in order to create an inert gas atmosphere inside the tank, and a continuous adsorbent flow is fed via a shut-off feeder from the tank to the feed pipe.