METHOD OF CHLORINATING POLYMETALLIC NIOBIUM-TANTALUM CONTAINING RAW MATERIAL AND DEVICE FOR IMPLEMEN

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FIELD : chemistry.SUBSTANCE : group of inventions pertains to the metallurgy of rare metals, in particular to the method of chloric decomposition of polymetallic niobium-tantalum containing raw material with obtaining of chlorides of niobium and/or tantalum and a device (chlorinator) for carrying out the chlorination process. The method involves chlorinating polymetallic niobium and/or tantalum containing materials in molten chlorides using chlorine, condensation and separation of the obtained pentachlorides of niobium and/or tantalum and chlorides of admixtures and tapping of the melt. Chlorination is done in the layer of melt with height of 500-1000 mm, containing iron chloride (up to 25% iron) and/or copper (up to 40% copper), as well as sodium chloride in quantity of not less than 1.2 kg for 1 kg of iron and not less than 2.2 kg for 1 kg of aluminium in the initial materials. The process is carried out at 550-850°C with consumption of chlorine of 1.7-2.2 kg for 1 kg of the initial materials. Tapping of the melt is done from the upper level through a tapping line. The chlorinator is water cooled, lined with graphite and equipped with a separation chamber, located in the upper part of the chlorinator. The ratio of the diameter of the chlorinator to the diameter of the separation chamber is equal to (2÷2.5) : 3, and the ratio of their heights is (1÷2) : 1. There is a removable graphite pipe for supplying chlorine, which runs through a water cooled connection pipe, tightly joined to the cover of the chlorinator, to the bottom of the chlorinator. Tapping of the melt is done from the upper level through a heated tapping line, lined with graphite.EFFECT : design of a efficient method of chloric decomposition of polymetallic niobium-tantalum containing raw materials with obtaining of chlorides of niobium and/or tantalum.2 cl, 1 dwg, 3 ex