Abstract: A method of treating process gases by cooling the process gas in the reactor so as to bring the process gas into contact with fluidized solid particles which are separated from the process gas after treating and mainly recirculated back to the reactor, in which method the process gas to be treated is mixed either simultaneously or at a short interval with both recirculated solid particles and gas, which gas, at least partly, is process gas which has been treated and from which solid particles have been separated after treatment, and in which method at least one of the components, i.e. solid particles or gas, to be mixed with the treated gas is cooler than the process gas to be treated.

Abstract: A lance for injecting a powdery material together with a carrier gas in metal melts such as liquid steel. The lance consists of a tubular body with an inner pipe bore having an inlet end and an outlet end for transport of powder through the tube. The lance has at least one outlet duct arranged adjacent the lower end for conducting powder from the pipe bore to the outside of the lance, said duct forming an angle of less than 90.degree. with the axis of the lance and being directed slopingly outwards/downwards from the bore towards the lance tip. The outlet duct or ducts are arranged in a nozzle contiguous to the tip of the lance, said tip being formed by a ceramic body intended for abutment against the bottom or wall in a ladle. In the outlet end of the pipe bore there is arranged a distributing means with a conical end adjacent the inlet openings of the outlet duct or ducts, for uniform distribution of the powdery material thereto.