Production equipment for producing concentrated nitric acid through magnesium nitrate method

Abstract

The embodiment of the invention discloses production equipment for producing concentrated nitric acid through a magnesium nitrate method. By the improvement of a concentration tower, the wall flowingand vertical liquid dropping of a magnesium nitrate solution can be effectively avoided, the content of dilute magnesium nitrate can be greatly reduced, and therefore the concentration of tail water of magnesium formed by the condensation of acid vapour steamed by a magnesium nitrate steamer is 0.1% or less. By adding an acid separator, thorough gas liquid exchange between the magnesium tail waterand the acid vapour can be conducted in the acid separator to effectively reduce the concentration of the tail water of a tower. The magnesium tail water is used as production water and delivered toa circulation water tank to act as production supplying water. By the above improvement, the comprehensive utilization of the tail water of the tower and acid waste water of the magnesium tail water can be achieved, and zero emission of the acid waste water is achieved.

Description

technical field [0001] The invention relates to the technical field of concentrated nitric acid production, in particular to a production equipment for producing concentrated nitric acid by a magnesium nitrate method. Background technique [0002] The magnesium nitrate method concentrated nitric acid production process is a process in which magnesium nitrate solution is used as a dehydrating agent to distill dilute nitric acid to produce concentrated nitric acid. Due to the characteristics of this process, while the nitric acid vapor is condensed in the concentrated nitric acid condenser to generate concentrated nitric acid, a small amount of tail gas and non-condensable gas is circulated through the tower tail water ejector to form a negative pressure and pumped to the tower tail water circulation tank for circular absorption to form acidic tower tail water. The dilute magnesium nitrate solution contains a small amount of non-condensable acid gas produced during the concent...

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Problems solved by technology

Although this method can effectively meet the requirements of environmental protection discharge, the acid concentration of acidic wastewater is high, and it needs to consume a large amount of liquid caustic soda for neutralization with alkali, which is costly, and the acidic wastewater from tower tail water and magnesium tail water cannot be rationally used, and energy saving and reduction cannot be achieved. Row

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