초록 ▼

A particulate material containing particles to be agglomerated and/or provided with a coating is introduced in batches into a space bounded by a container, in which a gas, in particular air, is passed through the particles. The particles are set in motion, for instance by the gas, such as in whirlin

A particulate material containing particles to be agglomerated and/or provided with a coating is introduced in batches into a space bounded by a container, in which a gas, in particular air, is passed through the particles. The particles are set in motion, for instance by the gas, such as in whirling motion, to form a whirling, layer. The particles are wetted by means of a mixture consisting of a gas and the vapor of a wetting agent. This mixture is introduced into the space containing the particles, and cold gas and a mixture of warm gas and wetting agent are supplied for example, alternately. In this manner, the particles may be wetted uniformly and relatively fast, and held at a relatively low temperature. This is of considerable advantage when processing thermolabile materials.

대표청구항 ▼

A process of treating a particulate material, in which the particles are subjected to motion, in a space, gas is passed through the particles and the vapor of a wetting agent destined to wet the particles is added to the gas at least during a certain time interval, so that at least one zone of the s

A process of treating a particulate material, in which the particles are subjected to motion, in a space, gas is passed through the particles and the vapor of a wetting agent destined to wet the particles is added to the gas at least during a certain time interval, so that at least one zone of the space containing the particles will contain a mixture of gas and wetting agent vapor, wherein the particles are cooled below the dew point temperature which the mixture of gas and wetting agent vapor has at least at the time before its contact with the particles and before it wets the particles by condensing wetting agent vapor, in which the space containing the particles is closed off from the surroundings, wherein the wetting agent vapor is intermixed with the gas before the gas is introduced into said space, the wetting agent being at the most incompletely saturated at the time the mixture of gas and wetting agent enters said space, and wherein a colder gas destined to cool the particles is passed through at least one zone of the said space, the temperature of said colder gas being lower than the temperature of the mixture of gas and wetting agent vapor and than said dew point temperature.