Abstract: A plasma-chemical reactor for treatment of disperse materials comprises a vertical working chamber. The top portion of the working chamber includes means to feed the disperse material into the reactor. The working chamber is provided with means for feeding and plasma-heating process gas, said means being a number of plasmatrons the nozzles of which are arranged along the periphery of the working chamber bottom portion and directed essentially at a right angle to the working chamber vertical axis. The reactor also includes means for evacuating gaseous products from the working chamber and a bin located under the working chamber and communicating with the bottom portion thereof.

Abstract: A process for the production of hydrogen fluoride, phosphoric anhydride, calcium polyphosphates and nitric acid, is disclosed, characterized in that natural phosphate is heated by a plasma stream of working gas in the presence of water vapors to form hydrogen fluoride which is recovered as a commercial product. Then the thus defluorinated phosphate is further heated by an air plasma stream having a bulk temperature of at least 3,500.degree. K. and containing nitrogen oxides. Under such conditions, the defluorinated phosphate decomposes to form phosphoric anhydride and calcium oxide.The gas stream carrying the phosphoric anhydride, the calcium oxide and the nitrogen oxides is cooled down to yield, as commercial products, either phosphoric anhydride and nitric acid, or calcium polyphosphates containing up to 70% P.sub.2 O.sub.5 and nitric acid, or else all of the three products, depending on the cooling conditions.