Processing method for tail gas generated in preparation of ammonium sulfate from phosphogypsum

Abstract

The invention discloses a processing method for tail gas generated in preparation of ammonium sulfate from phosphogypsum, and the method comprises the following steps: additionally arranging a washing tower, an exhaust fan and a circulating pump in a device for preparing ammonium sulfate from phosphogypsum.; connecting the circulating pump and the washing tower to form a circulating loop by virtue of a pipeline; feeding acid filtered fluid, utilized as circulating absorption liquid, from the device into the washing tower to backflush gas containing ammonia and absorb the ammonia in the gas, enabling the acid filtered fluid to flow to the bottom of the tower, then pumping out the acid filtered fluid by virtue of the circulating pump so as to be used as absorption liquid, and recycling and absorbing; returning part of the absorption liquid back into the device so as to be used as a reaction replenisher, wherein the ammonia in the liquid can be used for producing the ammonium sulfate; feeding the tail gas in the device for preparing ammonium sulfate from phosphogypsum and the volatized gas containing ammonia into the washing tower by virtue of the exhaust fan; and when the pH value of the circulating absorption liquid is overhigh, adding sulfuric acid from the bottom of the tower. The processing method can be used for sufficiently absorbing the tail gas in the device for preparing ammonium sulfate from phosphogypsum and the volatized gas containing ammonia, improving a field operation environment, recovering the ammonia for producing ammonium sulfate and reducing the ammonia consumption of products, and has economic benefits, thus being applicable to manufacturers for producing ammonium sulfate from phosphogypsum.

Description

technical field [0001] The invention relates to tail gas treatment, and also to ammonium sulfate, in particular to a tail gas treatment method for preparing ammonium sulfate from phosphogypsum. technical background [0002] Making ammonium sulfate from phosphorus chemical waste phosphogypsum is a better method in the comprehensive utilization of phosphogypsum. There have been a number of patent applications related to the production of ammonium sulfate from phosphogypsum, such as No. 200810068735.2 "A Method for Producing Ammonium Sulfate Using Phosphogypsum as a Raw Material", No. 200910102455.3 "Method for Co-producing Ammonium Sulfate and Calcium Carbonate Using Phosphogypsum", No. 201010117837.6 No. "Using Phosphogypsum to Produce Ammonium Sulphate and Potassium Calcium Silicon Fertilizer", No. 201110225837.2 "A Method for Preparing Ammonium Sulfate from Phosphogypsum by Polycrystalline Method". The production of ammonium sulfate from phosphogypsum requires ammonia ...

AI Technical Summary

Problems solved by technology

The production of ammonium sulfate from phosphogypsum requires ammonia as a raw material, and the volatilized gas and tail gas also contain ammonia gas. If it is not handled properly, it will cause deterioration of the operating environment and increase costs.

There is no patent application related to the tail gas treatment of phosphogypsum to ammonium sulfate

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