Abstract: A method for mineral upgrading or concentration, characterized in that a gangue-associated mineral having a hydrophobic surface and being in particulate form, is contacted with particles of a magnetic material also having a hydrophobic surface, whereby the mineral particles become attached to the surface of the magnetic particles, the magnetic particles with the attached mineral particles are separated from the gangue by magnetic means, and the mineral particles are then detached from the magnetic particles.

Abstract: A decomposition bomb in which intractable materials can be dissolved including a generally cylindrical hollow body, a liner of a chemically inert material within the body and extending over the upper edge thereof, a plug of chemically inert material which extends above the portion of the liner extending over the body and a closely fitting cap which is a hollow cylinder which can pass over the body, the liner and the plug to prevent movement of the liner and the plug. The invention also includes in association with the bomb a clamp within which the bomb can be located and which has a locking member having a pin bearing upon two ramps so that on partial rotation of the locking member pressure is applied to the cap of the bomb.