Device for absorbing heat generated during combustion of yellow phosphorus to concentrate and crystallize ammonium phosphate mother solution

Abstract

The invention discloses a device for absorbing heat generated during combustion of yellow phosphorus to concentrate and crystallize ammonium phosphate mother solution. The device comprises a heat absorbing unit, an evaporation unit and a crystallization unit which are sequentially and circularly connected, wherein the heat absorbing unit utilizes a yellow phosphorus combustion furnace jacket in a phosphoric acid workshop and is provided with a low-concentration ammonium phosphate mother solution storage tank I, a low-concentration ammonium phosphate mother solution storage tank II, a circulating pump, a valve I, a valve II and a valve III and a valve XI; the evaporation unit comprises a vacuum evaporator, a valve IV, a valve V, a valve VI, a concentrated ammonium phosphate mother solution storage tank and a cooler 12; and the crystallization unit comprises a crystallization tank, a dehydrator, a valve VIII and a valve X. Since the device uses the ammonium phosphate mother solution as a heat conducting medium to absorb the heat emitted during the combustion of the yellow phosphorus and then the ammonium phosphate mother solution is directly fed into the evaporator for concentration, not only can a great amount of circulating water be saved, but also the utilization ratio of the heat energy generated during the combustion of the yellow phosphorus reaches more than 80 percent. The device is easy to operate, the utilization ratio of the heat energy generated during the combustion of the yellow phosphorus is improved, the production cost is reduced, and the economic benefit, the social benefit and the environmental benefit are better.

Description

technical field [0001] The invention belongs to the phosphating industrial machinery technology, and relates to an ammonium phosphate mother liquor absorbing yellow phosphorus combustion heat concentration crystallization device. technical background [0002] Phosphoric acid and phosphates are important components in the chemical industry. The production methods of phosphoric acid are divided into thermal phosphoric acid and wet phosphoric acid. Because thermal phosphoric acid has the advantages of high product concentration and less impurities, it has been widely used in phosphorus chemical enterprises. In the production process of thermal phosphoric acid, phosphorus combustion produces a large amount of heat, which is taken away by cooling water and circulating dilute phosphoric acid in the prior art, and the energy is wasted in vain. For dehydration or polymerization in the production process of traditional anhydrous sodium phosphate and polymeric phosphate, the heat so...

AI Technical Summary

Problems solved by technology

At present, only a few manufacturers recycle yellow phosphorus combustion heat for the use of phosphorus dissolving tanks or dehydration of phosphate, and there is no device that uses ammonium phosphate mother liquor as a heat transfer medium to absorb yellow phosphorus combustion heat concentration and crystallization.

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