A process of smelting monazite rare earth ore rich in Fe

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The invention relates to a smelting process of an iron-rich monazite rare earth ore, which comprises the following specific steps : the iron-rich monazite rare earth ore with the iron content of 8%-40% is mixed with concentrated sulfuric acid and is roasted in a roasting kiln at the temperature of 231-600 DEG C; the rare earth reacts with the sulfuric acid to produce rare earth sulfate soluble in water or dilute acid, the iron reacts with the sulfuric acid to produce ferric sulfate, ferric phosphate or ferric pyrophosphate; the roasted ore is leached by water or the dilute acid, and then is filtered to obtain rare earth sulfate solution containing iron and phosphorus; the rare earth sulfate solution is neutralized, and the iron and the phosphorus are recovered to obtain purified rare earth sulfate solution; the purified rare earth sulfate solution is directly extracted and separated to prepare a single or mixed rare earth compound, or is prepared into mixed rare earth carbonate by a carbonate precipitation method. The smelting process effectively solves the effect of the iron on the rare earth extraction, has the advantages of simple process flow, continuity and easy control, low consumption of chemical materials, and high recovery rate of the rare earth and is applicable to large-scale production.