APPARATUS FOR CONCENTRATING DILUTED PHOSPHORIC ACID BY SPRAY EVAPORATING

The utility model relates to an apparatus for evaporating and concentrating the diluted phosphoric acid for the middle-grade phosphoric ore, comprising a casing, a scum skimmer and a scum blocking cover arranged on the upper part in the casing, a double cone tube arranged on the lower part in the casing for introducing the hot air and a diluted phosphoric acid feeding nozzle arranged near the throat of the double cone tube. The utility model solves the problems of scale formation, high stopping rate, high equipment cost, low running economic benefit, etc. Produced by evaporating and concentrating in the already existed technology of the diluted phosphoric acid produced by the middle-grade ore wet method. The utility model can also be widely used for evaporating the solution with high boiling point elevation, big viscosity and easy scale formation not applicable to the vacuum evaporation operation in the industrial departments such as the chemical engineering, the light industry, the food, etc.