Method and device for separating a mixture of materials into components having differing degrees of grindability

摘要

A method for separating a mixture of materials made up of components having differing defrees of grindability into an easily grindable component and a component which is more difficult to grind is described. The mixture of material is placed in a fluidised state by applying vapour or gas jets and subjected at the same time to impact comminution whose intensity is set by selecting the operating pressure and speed of the jets in such a way that only the more easily grindable component of the mixture of materials is comminuted. After the impact comminution, the mixture of materials is subjected to centrifugal force separation by means of which the more easily grindable component of the mixture of materials is separated off as fine-grade materials and the component which is more difficult to grind is separated off as coarse-grade material from the unground mixture of materials. A flow bed jet mill with centrifugal air separator arranged above the flow bed serves as a device for carrying out the method, the mill housing in said flow bed jet mill having in the circumferential area of the centrifugal force air separator an annular gap which opens into a discharge chamber for the coarse-grade material.