METHOD AND DEVICE FOR OBTAINING A POWDER FROM PARTICLES OF TUNGSTEN OR TUNGSTEN COMPOUNDS WITH A SIZE IN THE NANO-, MICRON OR SUBMICRON RANGE

摘要

The invention is directed to a process for recovering a powder of particles of tungsten or tungsten compounds having a particle size in the nano, micron or submicron range, in particular of W, WO 3, WC or WC-TiC or WC-TaC, with recycling of products from heavy metal or hard metal alloys in at least one reactor vessel containing a dispersion liquid in which the degradation of the products is carried out with a rotation of the reactor vessel with a controllable adjustable speed in a range between 0 and 90 U / min according to a predetermined algorithm is within the given algorithm, the maximum angle of inclination of the reactor vessel is between 0 ° and 40 ° and the rate of change of the angle of inclination in a range between 0.5 and 2 complete cycles per minute, and further as the dispersing liquid sulfuric acid with dissolved iron is used with S-Fe 3+ = 5 to 30 g / l and a pH of 1 to 3, and which contains bioorganic complexes of Fe 3+ and exo-polymers, with an associated bacterial association of Acidithiobacillus ferrooxidans, Acidithiobacillus thiooxidans, Leptospirillum ferrooxidans and Ferroplasma acidiphilum, the ratio between the volume V no of the products with heavy and / or hard metal alloys to the volume V br of the dispersion liquid at 1: 4 ‰ V br / V no ‰ ¤ 1: 0.5, wherein the temperature T of the solution of bioorganic iron complexes in the dispersant in a range of 10 ° C is kept to 60 ° C, and then released from the consisting of nano-, micron and / or submicron particles in the bioorganic solution of ions of Ni-Fe, Ni-Fe-Cu and / or Co-Fe and separated, whereby the pH changes by the separation of Ni, Cu and / or Co, wherein the nanopowder after cleaning subjected to a deagglomeration with ball mills or with ultrasound wi Rd, and then dried in a vacuum oven at a temperature of 90 ° C to 130 ° C and under a vacuum of 1 mbar to 50 mbar.