The study of tricalcium phosphate interaction with carbon tetrachloromethane and phosgene

Ukraine has no own high-quality phosphate raw materials for production of phosphate fertilizers, elemental phosphorus, and therefore there is a need to use the low-quality phosphate ores composed of limestone, glauconite, alumina and other impurities. Phosphorites with high silicon content and P2O5 content less than 10% can be recycled by gas-reduction method without entering flux. Objective of the paper is research and finding of alternative processing methods of domestic low-quality phosphate raw with a high content of carbonates and silicates. The influence of limestone impurities in phosphorites on P2O5 content in phosphate flux as well as on the reactors performance. The effect of chlorine adding on tricalcium phosphate recovery is investigated. It was studied that the presence of chlorine mixtures with natural gas stimulates the process of phosphorus obtaining due to the development of chain reactions and hydrocarbon radicals formation, and reduces phosphorus-obtaining temperature on 200 ... 300 ° C. During Ca3(PO4)2 recovery with methane in the presence of gaseous chlorine one should expect formation of complex system containing elemental phosphorus, PCl3, PCl5, POCl3 and products of oxidants reducing. Use of CCl4 and COCl2 for phosphorus obtaining enable to use low-quality phosphate raw with a high content of carbonates and silicates, prevents redox processes and transfers phosphorus obtaining in the mode of metabolism. Absence of flux additives and low-temperature process mode significantly improve the reactor performance